electric downhole safety valve made in china

The TSS series subsurface safety valves are tubing retrievable surface controlled subsurface safety valves. Compared with the TS series, the safety valve features super slim outer diameter design. The control line connects the valve to the surface, and the pressurization from surface on the control line controls the opening and closing of the flapper. This series of products includes self-equalizing and non-equalizing types.

Halliburton provides proven, high-performance tubing-retrievable and wireline-retrievable subsurface safety valves (SSSV) designed to reliably shut-in (fail safe) if a catastrophic event occurs, allowing operators to maintain safe operations.

Tubing Retrievable Surface Controlled Subsurface Safety Valves(API 14A SCSSV), W P 10000psi, 9Cr1Mo/13Cr/S13Cr/Inconel The TH series subsurface safety valves are tubing retrievable surface controlled subsurface ... Read More Get Best Price

Subsurface Safety Valves(API 14A SCSSV), W P 10000psi, 9Cr1Mo/13Cr/S13Cr/Inconel The TH series subsurface safety valves are tubing retrievable surface controlled subsurface safety valves used for high pressure ... Read More Get Best Price

Subsurface Safety Valves(API 14A SCSSV), W P 10000psi, 9Cr1Mo/13Cr/S13Cr/Inconel The TH series subsurface safety valves are tubing retrievable surface controlled subsurface safety valves used for high pressure ... Read More Get Best Price

Subsurface Safety Valves(API 14A SCSSV), W P 10000psi, 9Cr1Mo/13Cr/S13Cr/Inconel The TH series subsurface safety valves are tubing retrievable surface controlled subsurface safety valves used for high pressure ... Read More Get Best Price

Subsurface Safety Valves(API 14A SCSSV), W P 10000psi, 9Cr1Mo/13Cr/S13Cr/Inconel The TH series subsurface safety valves are tubing retrievable surface controlled subsurface safety valves used for high pressure ... Read More Get Best Price

Subsurface Safety Valves(VCTSY Series Ultra-temperature, Patent for Invention), Working Temperature 350 ℃ The VCTSY series ultra-temperature subsurface safety valves are tubing retrievable surface controlled ... Read More Get Best Price

Subsurface Safety Valves(TSS-4 1/2-5.97---TSS-7-8.375 SCSSV), WP 5000psi, 9Cr1Mo/13C/S13Cr/Incone The TSS series subsurface safety valves are tubing retrievable surface controlled subsurface safety valves. ... Read More Get Best Price

SCSSV(TS-5 1/2 -8---TS-7-9.288, Subsurface Safety Valves), Curved Flapper WP 10000psi, 9Cr1Mo/13C/S13Cr/Incone The TS series subsurface safety valves are tubing retrievable surface controlled subsurface safety ... Read More Get Best Price

Subsurface Safety Valves(TSV-2 7/8-5---TSV-7-8.35 SCSSV), Working pressure 5000psi, 9Cr1Mo/13Cr/S13Cr/Inconel The TSV series subsurface safety valves are tubing retrievable surface controlled subsurface safety ... Read More Get Best Price

Matched with the standard nipple---Subsurface Safety Valves(SCSSV), WP 5000psi The TSS series subsurface safety valves are tubing retrievable surface controlled subsurface safety valves. Compared with the TS ... Read More Get Best Price

Certification: TS licensing A1, A2, B1, B2, API-6D, CE, ISO9001, ISO14001, OHSAS18001, TUV issued by the API 6FA gate valve, API607 ball valve fireproof test

Neway Valve is one of the leading manufacturers of butterfly valves in China. It has a world-class valve plant that covers an extensive valve program to meet the needs of clients.

Neway butterfly valves are available in a number of series including T Series for concentric butterfly valves, TB Series for double offset butterfly valves, and TC Series for triple offset butterfly valves. These valves are used largely in chemical, nuclear, offshore, power, oil and gas, mining, and air separation industry.

Chaoda Group Wenzhou E-business Co., Ltd is an entirely owned branch of the Chaoda Valves Group Co., Ltd to market and sell valves, forging, casting, flanging, gas meter, etc. The company has earned special titles such as “Zhejiang Famous Product,” “Zhejiang Famous Brand,” and “Zhejiang Exporting Famous Brand.”

Chaoda houses a variety of cryogenic valves that are suitable for many different industries. They feature cryogenic globe, butterfly, check, trunnion ball, floating ball, check, gate, and other valves.

Chaoda forged steel cryogenic lift check valve is immersed in liquid nitrogen (-196 degree C) for 2 to 6 hours, then returned to normal temperature during production. This cycle is repeated twice to ensure the valve’s cryogenic abilities are top-notch. The valve can be made of carbon steel, stainless steel, alloy steel, and duplex stainless steel. It can be operated manually, by gear, electrically, or pneumatically. The valve can be used with oil, chemicals, natural gas, petrochemicals, coal chemicals, and more.

Beijing Valve General Factory Co., Ltd, or BVMC,was founded in 1953. With more than six decades of experience in the industry, the company has earned the position of vice chairman of National Valve Industry Association.

Beijing Valve General Factory has more than 60 years of experience in valve design and manufacturing. The company is actively involved in many national projects and also exports valves to more than 70 countries and regions around the world.

Their cryogenic ball valve can be used in temperatures ranging from -196 to 121 degrees C. The valve can be used with LNG and liquid nitrogen and is fire-safe and anti-static. The valve stem is extended and has extra packing ensuring any anti-flow. You can operate the valve with a handwheel, worm wheel, electric actuator or pneumatic actuator.

Through innovative organic development and strategic acquisition, we have built a broad portfolio of ASME and API valves that services the demands of global drilling, production, pipeline, storage, transmission, and critical service applications.

[1] 张梦婷,张勇. 国外井下安全阀的技术现状[J]. 石油机械,2008,36(7):81-84. doi:10.16082/j.cnki.issn.10014578.2008.07.019 ZHANG Mengting, ZHANG Yong. Technical status of subsurface safety valves at abroad[J]. Journal of Petroleum Machinery, 2008, 36(7):81-84. doi:10.16082/j.cnki.issn.1001-4578.2008.07.019

[2] 周大伟,钟功祥,梁政. 国内外井下安全阀的技术现状及发展趋势[J]. 石油矿场机械, 2007, 36(3):14-16. doi:10.3969/j.issn.1001-3482.2007.03.005 ZHOU Dawei, ZHONG Gongxiang, LIANG Zheng. Study of technical state and development tendency for downhole safety valve of domestic and foreign[J]. Oil Field Equipment, 2007, 36(3):14-16. doi:10.3969/j.issn.10013482.2007.03.005

[5] Al-YATEEM K S, HANBZAZAH S M, ALSYED S M, et al. First successful rigless conversion of subsurface safety valves from tubing retrievable to wireline retrievable in Middle East[C]. SPE 159202-MS 2012. doi:10.2118/159202-MS

[6] SCHLUMBERGER. Tubing-retrievable safety & injec tion valves[EB/OL].[2016-06-15]. http://www.slb.com/services/completions/safety_valves/tubing_retrievable_valves.aspx.

[7] HALIBURTON. Subsurface safety equipment[EB/OL].[2016-06-30]. http://www.halliburton.com/public/cps/contents/Books_and_Catalogs/web/CPSCatalog/09_Subsurface_Safety_Equip. pdf.

[8] BAKER Hughes. Subsurface safety systems[EB/OL].[2016-07-08]. https://www.bakerhughes.com/products-and-services/completions/well-completions/subsurfacesafety-systems.

[9] WEATHERFORD. Optimax series safety valves[EB/OL].[2016-07-15]. http://www.weatherford.com/en/productsservices/completion-and-stimulation/upper-completions/safety-systems.

[13] TAYLOR D M. Packer & safety valve development for ultra high pressure high temperature test & production wells[C]. OTC 23627-MS, 2012. doi:10.4043/23627-MS

[14] IMBO P, GANDINI G. Electro magnetic wireline retrievable-surface controlled subsurface safety valve:A new backup for surface controlled subsurface safety valve to avoid workover[C]. Ravenna, Italy, Offshore Mediterranean Conference and Exhibition, 2011.

[15] RAUSAND M, VATN J. Reliability modeling of surface controlled subsurface safety valves[J]. Reliability Engineering & System Safety, 1998, 61(1-2):159-166. doi:10.1016/S0951-8320(97)00066-5

[17] THAI D, ORZECHOWSKI D, PINARD G. Case study:Deepwater design verification and validation testing for subsurface safety valves for HPHT environments[C]. OTC 28983-MS, 2018. doi:10.4043/28983-MS

[18] LEBOEUF G J, ADAMS S M, PITTMAN A, et al. New design in surface-controlled subsurface safety valves resolves valve problems in subsea completions in the Gulf of Mexico[C]. OTC 19620-MS, 2008. doi:10.4043/19620MS

[19] AL-YATEEM K S, HANBZAZAH S M, ALSYED S M, et al. First successful rigless conversion of subsurface safety valves from tubing retrievable to wireline retrievable in Middle East[C]. SPE 159202-MS, 2012. doi:10.2118/159202-MS

[20] CHARPENTIER T V J, BARAKA-LOKMANE S, NEVILLE A, et al. Comparison of characteristic of antiscaling coating for subsurface safety valve for use in oil and gas industry[C]. IPTC 17953-MS, 2014. doi:10.2523/IPTC-17953-MS

[21] KUMAR D, WELCH J C, XU Z. Reduction in scale buildup from sub-surface safety valve using hydrophobic material coating[C]. SPE 166218-MS, 2013. doi:10.2118/166218-MS

[22] EHTESHAM M A, TUCKER R, GILES J. Downhole safety valve for well-intervention operations:Design, testing, and successful case history[C]. SPE 142887-MS, 2011. doi:10.2118/142887-MS

[23] WAGNER A N. Capillary based surface controlled subsurface safety valve systems solution for problematic wells[C]. SPE 183837-MS, 2017. doi:10.2118/183837MS

[24] 周大伟. 井下安全阀系统设计与分析[D]. 成都:西南石油大学, 2007. ZHOU Dawei. Design and analysis of subsurface safety valves" system[D]. Chengdu:Southwest Petroleum University, 2007.

[25] 牛贵锋, 杨万有. 高温高压井下安全阀阀板优化研究[J]. 石油矿场机械, 2017, 46(2):11-16. doi:10.3969/j.issn.1001-3482.2017.02.003 NIU Guifeng, YANG Wanyou. Optimization of valve plate of high temperature and high pressure downhole safety valve[J]. Oil Field Equipment, 2017, 46(2):11-16. doi:10.3969/j.issn.1001-3482.2017.02.003

[27] 黎伟,宋伟,李乃禾,等. 滑套式井下安全阀设计及动态特性分析[J]. 中国安全生产科学技术, 2017, 13(2):159-163. doi:10.11731/j.issn.1673-193x.2017.02.028 LI Wei, SONG Wei, LI Naihe, et al. Design and dynamic characteristic analysis of sliding-sleeve subsurface safety valve[J]. Journal of Safety Science and Technology, 2017, 13(2):159-163. doi:10.11731/j.issn.1673193x.2017.02.028

[28] 李美求,阳康,周思柱,等. 自平衡井下安全阀动态平衡响应分析[J]. 液压与气动, 2017(6):70-74. doi:10.11832/j.issn.1000-4858.2017.06.014 LI Meiqiu, YANG Kang, ZHOU Sizhu, et al. Dynamic equilibrium response analysis for self-balancing subsurface safety valve[J]. Chinese Hydraulics & Pneumatics, 2017(6):70-74. doi:10.11832/j.issn.10004858.2017.06.014

[29] 李常友,孙宝全,董社霞,等. SC35-129A型井下安全阀的研制[J]. 石油机械, 2005, 33(1):43-44. doi:10.16082/j.cnki.issn.1001-4578.2005.01.014 LI Changyou, SUN Baoquan, DONG Shexia, et al. Development of model SC35-120A downhole safety valve[J]. Journal of Petroleum Machinery, 2005, 33(1):43-44. doi:10.16082/j.cnki.issn.1001-4578.2005.01.014

[31] 孔学云, 李宝龙, 齐海涛, 等. 88.9 mm油管携带式井下安全阀研制[J]. 石油矿场机械, 2016, 45(9):49-52. doi:10.3969/j.issn.1001-3482.2016.09.011 KONG Xueyun, LI Baolong, QI Haitao, et al. Research and development of 3-12 in. tubing-retrievable subsurface safety valve[J]. Oil Field Equipment, 2016, 45(9):49-52. doi:10.3969/j.issn.1001-3482.2016.09.011

[32] 吴迪. 井下安全阀液体综合试验系统的研究[D]. 长春:长春理工大学, 2011. WU Di. Research on subsurface safety valve liquid test system[D]. Changchun:Changchun University of Science and Technology, 2011.

[33] 王战友. 井下安全阀气体综合试验检测系统研究[D]. 长春:长春理工大学, 2014. WANG Zhanyou. Research on subsurface safety valve gas test system[D]. Changchun:Changchun University of Science and Technology, 2014.

[34] SHANG Chenmin, ZHANG Dongmei, ZHANG Xinming. Subsurface safety valve automation test systems design[J]. Applied Mechanics & Materials, 2014, 543-547:1188-1191. doi:10.4028/www.scientific.net/AMM.543547.1188

[36] 张福涛. 海上油井井下安全阀检测系统设计[J]. 内蒙古石油化工,2012(24):79-80. doi:10.3969/j.issn.10067981.2012.24.036 ZHANG Futao. Testing system design of offshore well subsurface safety valves[J]. Inner Mongolia Petrochemical Industry, 2012(24):79-80. doi:10.3969/j.issn.10067981.2012.24.036

The utility model relates to a cable protection device for a downhole safety valve. The cable protection device comprises a first splitting body and a second splitting body, wherein the two splitting bodies are detachably connected by bolts; and a cable installation groove is arranged on the inner wall of the first splitting body. Besides, the cable protection device is characterized in that a convex rib is arranged at a position, corresponding to the position of the cable installation groove, at the outer surface of the first splitting body; and shoulders are arranged at one end of the first splitting body and the corresponding end of the second splitting body. According to the utility model, the convex rib that is arranged on the outer surface of the first splitting body forms a local outer convex structure, so that the contact of the cable and the inner wall of a sleeve during the installation and using process can be avoided and thus the cable wearing can be completely avoided and the service life of the cable can be prolonged. Compared with the existing structure, the convex rib structure enables the quality and the material consumption to be reduced. In addition, because of the shoulders that are arranged at the ports, a positioning reference is realized when the cable protection device is installed, thereby enabling the instillation to become convenient and improving the positioning precision; and the cable protection device can be ensured not to be slided or turned around when being used.

The utility model relates to and is used for device fixing and the protection cable, particularly a kind of storm valve electric cable protector in the oil well operation.

Electric cable protector be a kind of be arranged on oil pipe or the position such as adjacent oil distributing pipe box cupling be used for protective device fixing and the protection cable, wherein cable comprises cable and data line.At present; common cast moulding electric cable protector is made of the first split and the second split; the inwall of one of them split is provided with the cable mounting groove, and after two split docking, formation can be held the complete enclosed construction on oil pipe tightly, and two splits are connected by upper and lower bolt is detachable.When above-mentioned casting mold type electric cable protector is used in the downhole safety valve position; for realize that cable can not contact with the internal surface of sleeve pipe in the outside in installation and use procedure; thereby cause the purpose of wearing and tearing, usually adopt and strengthen two split wall thickness, realize thereby increase protector entity volume.The protector of this increase wall thickness in actual use, exists the location inaccurate, and is subjected to be prone to the problems such as slips, torsion after external force, thereby can not thoroughly realize the protection of cable, and protector not only causes waste of material from great, installs also and requires great effort.

The utility model for solve the technical problem that exists in known technology provide a kind of easy for installation, registration, quality light, reduce material consumption, and can thoroughly avoid the storm valve electric cable protector of cable wearing and tearing.

A kind of storm valve electric cable protector, consisted of by the first split and the second split, two splits are by the detachable connection of bolt, and the inwall of described the first split is provided with the cable mounting groove, it is characterized in that: position corresponding with the cable mounting groove on the outer wall of the first split is provided with raised ribs; One end of the first split and the corresponding end of the second split are provided with shoulder.

Above-mentionedly be located at first minute raised ribs on external surface and form local outer lug structure, avoided install with use procedure in cable contact with internal surface of sleeve pipe, and then thoroughly avoided the cable wearing and tearing, extended the useful life of cable; This raised ribs structure has alleviated quality and has reduced material consumption than existing structure; In addition, be located at the shoulder of port position, make electric cable protector when mounted, have positioning datum, install and improved positioning accuracy thereby facilitated, guaranteed in use, electric cable protector the problems such as slip, torsion can not occur.

In figure: 1, the first split; 1-1, raised ribs; 2, the second split; 3, bolt; 4, shoulder hole; 5, safety valve; 6, oil pipe; 7, box cupling; 8, cable; 9, sleeve pipe.

See also Fig. 1 and 2, a kind of storm valve electric cable protector consists of 2, two splits by the detachable connection of bolt 3 by the first split 1 and the second split, and the inwall of described the first split is provided with the cable mounting groove.Position corresponding with the cable mounting groove on the outer surface of described the first split is provided with raised ribs 1-1.Concrete, the height in the safety valve position after the height of raised ribs is installed greater than cable gets final product, and contacts with sleeve pipe 9 inwalls to avoid cable.One end of described the first split and the corresponding end of the second split are provided with shoulder.Concrete; be located at First shoulder portion and the second shoulder part that is located in the second split in the first split; after two split docking; formation shoulder hole 4; the box cupling 7 of this shoulder hole and connection safety valve 5 and oil pipe 6 just mates; being box cupling can be inserted in the shoulder hole away from an end of safety valve, thereby has realized that electric cable protector is along the axial location of oil pipe.In addition, this shoulder fit structure has realized that also cable 8 fixes at the chucking of electric cable protector exit position.

Above-mentioned electric cable protector needs paired use in use, and is concrete, at the port of safety valve up and down two box cuplings, an electric cable protector is installed respectively, and two cable protections are arranged symmetrically centered by safety valve.

1. storm valve electric cable protector, consisted of by the first split and the second split, two splits are by the detachable connection of bolt, and the inwall of described the first split is provided with the cable mounting groove, it is characterized in that: position corresponding with the cable mounting groove on the outer wall of the first split is provided with raised ribs; One end of the first split and the corresponding end of the second split are provided with shoulder.

SSSV: Subsurface Safety Valve: a valve installed in the tubing down the well to prevent uncontrolled flow in case of an emergency through the tubing when actuated. These valves can be installed by wireline or as an integral part of the tubing. Subsurface Valves are usually divided into the following categories.

SCSSV: Surface-Controlled Subsurface Safety Valves: SSSV which is controlled from the surface and installed by wireline or as an integral part of the tubing.

SSCSV (storm choke): Subsurface-Controlled Subsurface Safety Valve: SSSV which is actuated by the flow characteristics of the well, and is wireline retrievable.

ASV: Annulus Safety Valve: a valve installed in the well to prevent uncontrolled flow in the casing-tubing annulus when actuated. It consists of an annular safety valve packer with a by-pass. The opening in the by-pass is controlled by a safety valve, which can be an integral part of the packer on a wireline retrievable valve.

The tubing safety valve is installed to provide a flow barrier in the production tubing string, between the tail pipe and the surface or mudline. Such a valve consists of 3 main items:

Safety valve should not be considered as an extra barrier in the tubing when the well is closed-in for a long period of time. Sealing is not optimal because of design space limitations. They should not be used to regularly shut-in the well.

The annulus safety valve (ASV) provides a flow barrier in the casing-tubing annulus. It consists of an annular safety valve packer with a by-pass. The opening of the by-pass is controlled by a safety valve, which can be an integral part of the packer or a wireline retrievable valve. It is a surface controlled, fail-safe closed device for annular flow.

In general, the ASV is installed in gas lifted wells where the annulus is filled with compressed gas and serves as a barrier. Because of gas lift valves, the tubing cannot be considered as a barrier between the reservoir and the surface. Although the gas lift valves are commonly equipped with check valves, they are not a valid barrier. The ASV is normally located at a shallow depth to reduce the volume of the gas stored in the annulus between the ASV and the wellhead.

The valve body and connections should be at least as strong as the tubing. It should provide leak resistance to internal and external pressures and be compatible with the fluids.

During the installation of the tubing string, it is necessary to keep the valve open. This can be done by inserting a retrievable lock-open tool in the valve, without or in combination with the control signal from surface.

Multiple zone completions, where wireline jobs are frequent on equipment installed beneath the safety valve. The larger bore of a TR-SSSV facilitates the operations, where a WR-SSSV normally has to be retrieved.

The wireline retrievable safety valve (WR SCSSV) is run on wireline. A lock mandrel is screwed on top of the WR SCSSV that enables using a landing nipple. This nipple must hold the valve/mandrel assembly against pressure differentials loads. The nipple has a polished bores to seal the path between WR SCSSV and landing nipple by seals fitted to the outside of the valve/mandrel assembly.

With hydraulically operated WR SCSSVs, the external seals have also the function of containing the control fluid that is to be transmitted to the valve actuator.

The landing nipple for an electrically operated valve has a connection for an electric control line and an inductive coupler to transmit the signal to the WR SCSSV.

Trough Flowline retrievable safety valves use specially constructed mandrels and landing nipples. They must have a stronger hold-open force than SCSSVs, because the Trough Flowline tools are circulated upwards in the tubing string, which tends to drag the valve"s flow tube up, causing the valve to close. To overcome this problem the actuator hold-open force should be higher than the sum of the normal hold open force and the drag forces that can be experienced. Trough Flowline retrievable SSSVs can be used for subsea completions where wireline operations are difficult.

Another application is to install a SSSV in tubing without a landing nipple. Such a system consists of a production packer with an integral safety valve. The assembly is positioned by the coiled tubing and the packer is set by pressure from the coiled tubing.

Subsurface controlled valves are normally open and are designed to close with an abnormal change in well condition. They detect the flow or well pressure and close when the set limit is reached. Basically there are three different concepts:

Surface controlled valves utilise valve elements that are normally closed. This fail-safe mode requires that the valve is to be opened by a hydraulic control-line pressure. Loss of this pressure will result in the closing of the valve by a spring. The hydraulic pressure is supplied from a surface control panel to the valve and acts on the actuator. Typical for hydraulic operated SCSSVs is the hydrostatic head pressure, generated by the vertical column of control fluid, which additionally acts on the valve actuator.

the surface control line pressure and the time for valve operation will give an indication whether the valve opening and closing performance is satisfactory;

TR-SCSSVs of which the hydraulic actuator is damaged can be put back into function by inserting a back-up valve (insert valve), which can be operated with the existing hydraulic control system;

Electrically operated SCSSVs have in common with hydraulic SCSSVs that the differential pressure over the closed valve must be equalised before the valve can be opened and a means to keep the valve open must be permanently available from surface for fail safe operation.

With electric valves that means is an electrical signal, either dc or ac. Loss of this signal will result in closing of the valve. The force to close is always provided by expanding steel springs, which are precompressed by either electric power or by the well pressure.

One type of mechanically operated SSSV is the Go-Devil valve from Otis. This safety valve is a normally open valve. It is designed to close by an impact force on the head of the valve, provided by a heavy ball that is dropped from a ball-dropper assembly at surface. The impact force will activate the spring based mechanical linkage, that moves the valve to the closed position.

The ball-dropper assembly is flange mounted on top of the Christmas tree. The pocket of the ball dropper retains the ball, sized to activate the Go-Devil SSSV by falling against flow and impacting the head of the valve. The ball dropper assembly retains the ball until the loss of the control signal activates the release mechanism.

Three types of valve closure elements are commonly used for SSSV: the ball, the flapper and the poppet type. The flapper valve can further be divided in flat, contoured and curved flappers, while the poppet valve can be divided into closed body and sleeve type poppet valves. All types of closure elements pinch off the fluid stream by a pair of opposing surfaces rather than sliding surfaces. This principal method has the advantage that it can provide a good tight shut-off when the sealing surfaces are sound.

As noted the flapper valves may be flat, curved or contoured. The latter two were introduced to obtain a better OD/ID ratio, as they are shaped to fit when in the open position, more efficiently in the annular space of the valve housing.

The seat angle is the shape of the flapper sealing surfaces, which is an important parameter of the valve sealing performance. Traditional flapper valves have a seat angle of 45°, as the angled seat has the advantage that:

Due to the characteristics of the curved flapper design the seat angle may vary from 0° to 60° along the flapper circumference, thus requiring stringent alignment of the sealing faces. The contoured flapper design has an angled sealing surface over the full circumference of the flapper and thus has potential to provide good sealing. Field experience indicate that the flapper valve type is more reliable than the ball valve type.

When a SSSV is closed, a high differential pressure may be present across the valve closure element. Opening the valve under this condition will be difficult, if not impossible, because of the incapability of the relatively small valve mechanism to cope with the load working on the large diameter closure element. Insufficient equalising will introduce high loads that could deform critical valve parts. Also, erosive wash-out on the closure element by the sudden rush of well fluid through the partly opened valve can occur. Therefore, prior to opening a SSSV it is necessary to equalise the differential pressure.

The depth at which to set the subsurface safety valve depends upon a number of variables, such as hydrate and wax formation tendencies, deviation kick-off depth, scale precipitation, earthquake probabilities, etc. The OD of the safety valve may influence the casing/tubing string configuration and should be addressed at the conceptual design stage.

For tubing safety valves it is obvious that the deeper the valve is set (closer to the hydrocarbon source) the more protection it will give to the completion. However, the application of a deep-set tubing SSSV generates some unfavourable conditions, namely:

the higher temperature further downhole effects the reliability and the longevity of non-metal valve parts, for instance polymeric seals in hydraulic valves and electric/electronic parts in electric valves;

the hydrostatic head pressure generated by the hydraulic control-line column will generate excessive forces on the valve operating mechanism. Hence, designing and manufacturing of these valves becomes more complicated.

Furthermore, the required control pressure to operate a single control line valve (the majority of SSSVs) could become too high and more than the pressure rating of standard well completion equipment.

The approach for determining the required hydraulic control pressure at surface to hold a valve open depends on the type of valve, viz. the single control line valve, the dual control line valve and the valve with a pressure chamber.

Due to friction in the valve mechanism and the spring characteristic, there is a certain spread between the valve opening pressure (Pvo) and closing pressure (Pvc).

To ensure that the valve is completely open, a safety factor or pressure margin (Pm) is added to the surface control pressure. Hence, the available control pressure at surface to open the valve must be at least:

The dual control line valve or the pressure balanced valve uses a second control line from surface to balance the generated hydrostatic head pressure in the control line. The forces acting to operate this type of valve are as follows:

Due to friction in the valve mechanism and the spring characteristic, there is a certain spread between the valve opening pressure (Pvo) and closing pressure (Pvc).

When the valve is in the fully open position and the control and the balance line are both filled with fluid of the same fluid gradient, the following force equilibrium exists:

To insure that the valve is completely open, a safety factor or pressure margin (Pm) is added to the surface control pressure. Hence, the available control pressure at surface to open the valve must be at least:

The dome charged valve uses a pressure in an integral dome to (partly) balance the generated hydrostatic head pressure in the control line. The forces acting to operate this type of valve are as follows:

Due to friction in the valve mechanism and the spring characteristic, there is a certain spread between the valve opening pressure (Pvo) and closing pressure (Pvc).

To ensure that the valve is completely open, a safety factor or pressure margin (Pm) is added to the surface control pressure. Hence, the available control pressure at surface to open the valve must be at least:

The theoretical maximum setting depth of a single control line SSSV depends on the capacity of the valve closing spring to overcome the generated hydrostatic head pressure in the control line. For fail safety it is essential that the tubing pressure is not taken into account for the assistance of valve closing, even though single control line valves are assisted by this pressure. Hence, the governing factors for the maximum valve setting depth are:

* For fail safety, the worst case must be assumed, one in which the control line ruptures near the valve and annulus fluid will enter the control line. Therefore, for any completion the heaviest fluid gradient, either from the control fluid or from the annulus fluid, is used as the minimum control line fluid gradient.

Because the hydrostatic head pressure in the control line is counteracted, the setting depths of the dual control-line and the dome-charged valves are theoretically not limited.

Genuine Original parts for above brands for stationary compressors and portable mobile compressors plus the Atlas Copco Vacuum Pumps Original Parts;Epiroc, Sandvik, SEW, Honeywell, Mann Filters, Siemens, Eaton,Schneider ElectricABB, CAT, Konecrane Parts, Ametek Land, etc;

CPMC China service team strive for offering all kinds of Genuine original spares parts like: Airend, motors (ABB, Caterpillar, Cummins, Kubota, Siemens motors), air filter, oil filter, air and oil separator, bearings (SKF, KOYO, NTN, NSK, FAG, etc), belts(continental, Gates, MBL, etc), lubricating oil, maintenance service kit, intake valve, check valve, oil-cut valve, safety valve, minimum pressure valve (MPV), auto drain valve, pressure regulator valve, solenoid valve, temperature sensor, pressure sensor, cooler, fans assembly, fan motors, gears set, housing bearings, air tools, woodworking tools of blades, etc.

Subsurface Safety Valve TRSSSV is a kind of tubing retrievable safety valve which is controlled at the surface. It directly connects to the tubing string. There is a hydraulic control line connecting to the safety valve from the ground. While a certain amount of pressure is supplied through this control line to the safety valve, the valve remains open; while the pressure is released, the safety valve will close and the tubing pass is closed at the same time.