wireline overshot made in china

Overshot is one of the necessary equipment for wireline drilling which could be put into the hole. This fishing tool is used to connect with the inner tube assembly and lift it up. Overshot is attached to drill rod and lowered over the pipe or stuck in the borehole. Hardened and self-cutting threads inside overshot firmly grasp the pipe, allowing the fish (such as inner tube and core) to be pulled from the hole.

5.The rotary overshot is a non-releasable tool and should normally be run below a safety joint in order to have positive release mechanism from the fish.

CDG’S overshot is an external catch fishing tool designed to catch the inner tube and core from the hole. Once the inner tube of a wireline core barrel is full of core sample, overshot is released from the top. Wireline overshot assembly slides inside the wireline drill rods and locks the spear head of core barrel. Along with inner tube, it is pulled out with steel wire rope.

China Drilling Geological Equipment Ltd. is a professional manufacturer of drilling tools. Main products cover impregnated synthetic diamond core bits, surface-set diamond bits, PDC core and noncoring bits, rod shoes & casing shoes, reaming shells, drill rods, core barrels, fishing tools (like overshots or wireline overshot assembly), water swivels, hoisting plugs, casing cutter assembly, adapter subs, wrenches, recovery tools and foot clamps. 80% of our products are sold abroad.

Overshot is a necessary device in wireline drilling. It"s dropped on a cable and directly couples onto and lift up the inner tube assembly, eliminating the need to couple and uncouple the rod string each time the core is retrieved.

Ezy Lock Overshot is a modified product based on compact overshot. It protects against accidental release of the core barrel. This is ideal for suface application when hoisting above ground. Q series overhshot are available in A, B, N, H and P size.

As a professional manufacturer of BQ NQ HQ PQ SQ series overshot assembly in China, we still provide customers worldwide with China overshot assembly, hoisting plug, foot clamp, circle wrench, etc.

1. Drill rod: BQ NQ HQ PQ SQ and AW, BW, NW, HW, BTW, NTWCasing tube: BW, NW, HW, HWT2. Core barrel: BQ NQ HQ PQ & head assembly and core barrel assembly3. BQ NQ HQ PQ , BTW, NTW, HTW etc. Diamond core bit, reaming shell & shoe bit (Imp. and surface-set, PDC) , oversize supplied4. Drill tool: hoisting plug, water swivel, overshot, outer tube & inner tube wrench, foot clamp,etc.

Wireline series: Geobor S, WLA, WLB, WLN, WLH, WLP, WLB3, WLN3, WLH3, WLP3, WLN2, AQ, BQ, NQ, HQ, PQ, SQ, PQ3, HQ3, NQ3, BQ3, NQ2, WL-56, WL-66, WL-76

I debated on where to go next, but at the end of the day the most widely used fishing tool has to be an overshot. Some will say why not a spear? Well if you must ask, always go with the strongest fishing tool you can run to catch the fish. And if you run a spear, never plug the I.D. of your fish by breaking it off. Done with that!

The info that follows has been taken from the manuals published on overshots. I realize that paper manuals are a thing of the past, yes, yes at one time fishing tool hands carried massive catalog brief cases full of reference material. Now you have the luxury of your laptop loaded with information. If you have never sat down and read an overshot manual, now might be a good time.

The overshot is highly versatile and efficient tool. There are several different types of overshots, however each overshot is designed to engage a specific size of tubing, pipe, coupling, tool joint, drill collar or smooth OD tool.

The original overshot was developed by Bowen Oil Tools, which is now part of NOV. One thing I will point out is that in the catalogs you will see more than one assembly number for a given OD of Overshot, this came about due to the two locations developing their own variations. I found this information on NOV’s website and thought it was interesting to share.

Bowen™ became a leader in innovation with the creation of the first overshot, the Series 150, in 1935. This tool set the standard for fishing equipment, and the quick acceptance of the tool assured the company partners that their business would be successful. The company continued to create new products, building a reputation for their well tool design and construction.

Currently there are several manufacturers of overshots, NOV (Bowen), Rubicon (Logan) and Applied Oil Tools (Gotco). These overshots are designated by a series number as follows:Series 10 - Sucker Rod Overshot

Overshots may be identified by one of the following, known as “type”:Full Strength (FS) - engineered to withstand all pulling, jarring and torsional strain

The basic overshot (from top down) consists of a top sub, a bowl, grapple, control, and a guide. In addition to the basic components, some overshots (Series 10 and 150) can be dressed with either a:Spiral grapple used if the fish diameter is near the maximum catch of the overshot, or a

The Series 150 Overshot features the ability to packoff on the fish. When the circulating packoff is not used, the fluid circulates down the drillpipe, aroundthe top outside of the fish, through the slip or grapple assembly, around the guide shoe and up the annulus.

When the circulating packoff is used, the annular space between the top outside of the fish and the inside of the lower part of the overshot is packed off, diverting the fluid flow down into the fish, making it easier to release and recover the fish. Packoffs usually are not high pressure devices but will often withstand sufficient pressure to establish circulation through the fish. Third party high pressure packoffs are available from various sources.

The extension can be installed between the top sub and the bowl of the Series 10, 70, and 150 overshots. It is used to extend the overshot bowl to:Allow the grapple to catch farther down on a fish that may be necked down at the top by having been pulled in two, or latched by an overshot and released several times, or to

A stop ring must be used where a fish OD reduces immediately below the catch area to allow the grapple to bite on full-size pipe.Example - catching a Hydril upset or EUE collar. If the upset of collar should pass completely through the grapple, the overshot may not be releasable.

The Series 10 Sucker Rod Overshot is designed to engage and recover sucker rods, couplings, and similar items from inside tubing strings.Basket grapples are recommended for fishing for hardened and ground boxes (Sucker Rod Box).

The Series 20 Sucker Rod Overshot is a short catch tool which provides a means for engaging the exposed portion of a fish too short to be engaged with a Series 10 overshot.Uses basket grapples only

The Series 70 Short Catch Overshot is designed to engage the exposed portion of a fish too short to engage with Series 150 overshots.Uses basket grapple only

The Series 150 Releasing and Circulating Overshot is used to engage, packoff, and retrieve twisted-off lost tubing, drillpipecoupling, tool joint, casing or other similar fish.

A right hand wicker grapple converts a normal right release overshot to left hand release. This grapple is used where you expect to apply excessive right hand torque to release a packer, safety joint, etc. Note: Overshot will have to be released by left hand rotation.

High Pressure Packoff Assemblies:The High Pressure Packoff Assembly is an accessory to the Series 150 Overshots. It is used when high pressure circulation to the fish is required. It consists of a packoff sub with packing and packing rings and is installed between the top sub and bowl of the overshot. By running the packoff sub above the bowl, this design prevents the application of high internal pressures to the overshot bowl. The design of the High Pressure Packoff Assembly allows pressures two to three times the standard overshot packoff to be applied to the fish.

This information comes directly from the NOV manual for the Wide Catch Overshot. This is probably the first and only change to this common tool I know of in my career.

The Wide Catch Overshot provides the strongest tool available to externally engage, pack-off, and pull a fish that has been significantly worn. This tool has similar rugged design features and construction as the industry standard, Bowen Series 150 overshot, with the ability to interchange the Bottom Guide with the full range of existing components used with the standard Bowen Series 150 overshot.

In service, the Wide Catch Overshot (WCOS) takes a positive grip over a large area of fish and is capable of withstanding heavy pulling, torsion, and jarring strains without damage to the tools or the fish.

The WCOS has been designed to significantly increase the catch range of the OD of the fish to be caught, compared to the standard overshot. This enables a greater opportunity for a successful fishing operation in a reduced number of trips, thus reducing overall intervention costs for the operator. In addition to the large catch range, the WCOS has the ability to seal across very large extrusion gaps at both standard and high pressure and provide full circulation through the fish, should it be required.

Connections between the Top Sub/Bowl and Extension Sub have been designed to create a seal. This will prevent the connection from washing out should the overshot be required to be flowed through for a long period of time. In order to lock the Top Sub/Extension Sub to the Bowl from backing off during operation, set screws have become standard and will gall the threads should the connection break free.

The operation of all overshots is identical. The exception being that the Series 150 carries a packoff which provides circulation through the fish. First, determine that the overshot is properly assembled and dressed with the proper size grapple. Make up the overshot on the fishing string (normally it is run connected to the bottom of the bumper sub) and run it into the well. As the top of the fish is reached make sure circulation has been established to clear overshot ID of any plugging. Lower the overshot onto the top of the fish with no rotation at first. A 5,000 pound set down weight will be sufficient to engage the grapple. While lowering the overshot over the top of the fish watch for pressure build up, shut off pumps if any pressure build up is noticed. Should any back pressure be noticed, release the back pressure to allow the grapple to engage the fish. By elevating the string it can be determined, if the grapple went over and engaged the fish. If unable to work overshot over top of fish without rotation, then slowly rotate the fishing string to the right and gradually lower the overshot over the fish. Combined rotation and lowering over top of the fish are important to keep the grapple in the release position. This provides the maximum clearance between the grapple and fish. While lowering the overshot over the top of the fish, watch for torque build up and an increase in pump pressure. A pump pressure build up indicates the overshot has gone over the top of the fish thereby reducing the flow area. Stop rotation (continued rotation could dull the wickers of the grapple) enabling the grapple to set. Allow the right hand torque to slack out of the string and then pull on the string by elevating the string to set the grapple.

To release from the fish, bump down, then simultaneously rotate to the right and slowly elevate the fishing string. It is best to have a clean fishing top before running the overshot.

Wireline drill tools can lift drill core from drill rods without picking up bits. All the tools include principal parts of the drill tools, overshotassembly, drill rods, holding dog, circle wrench...

Q3 wireline systems consisit of the same groups as the Q series but utilize a third tube called an inner-tube liner or split tube. The liner is placed inside the inner-tube.

Wireline triple core barrel system consist of the same groups as the double tube core barrel but utilize a third tube help integral core recovery when drilling coal, clay bearing or highly...

Boart Longyear Improves Wireline Core RetrievalBoart Longyear developed the wireline core retrieval system in 1958 and was the first diamond drilling exploration product manufacturer to offer this revolutionary system. The Genuine Q™ wireline system increased productivity on the work site and made tripping core from the bottom of the hole safer for the drilling assistant.

However, Boart Longyear has recently made improvements to the system, significantly increasing reliability and performance.Primarily, wireline systems require a sample-receiving inner tube completely independent to the rod string, while located at the bottom of the rod string, in the outer tube behind the drill bit.

Mounted at the top of the inner tube assembly is the head assembly, which includes the critical latch mechanism required to hold the inner tube while receiving the core sample and to release the filled inner tube for wireline retrieval.

A device called the overshot is attached to a wireline cable and lowered or pumped into the hole until it captures the head assembly, allowing the inner tube to be pulled or hoisted back to the drill rig by use of a winch or hoist.

The head assembly of the original Q system incorporated a latch mechanism consisting of a pair of pivoting latches, deployed by a wire “butterfly” spring and retracted by the impact with the bottom of a slot in the latch retracting case when retracted by the wireline overshot.

In 1998, Boart Longyear once again secured its position as the leading innovator in wireline technology by introducing the patented Link Latch™ mechanism. This innovation virtually eliminated “stuck tubes” by providing mechanical leverage during wireline retraction, directly pivoting the latches into the retracted position, whereas conventional technology attempted to indirectly push the latches while fighting poor mechanical leverage and interference with the latch seat.

Boart Longyear offers two styles of locking couplings, “full-hole” and “stabilized.” While both are cut from the same high-quality alloy steel tubing material used for wireline drill rods, full-hole locking couplings have an over-sized outer diameter with four equispaced flats that are cold-drawn along each length.

Boart Longyear offers two styles of locking couplings, “full-hole” and “stabilized.” While both are cut from the same high-quality alloy steel tubing material used for wireline drill rods, full-hole locking couplings have an over-sized outer diameter with four equispaced flats that are cold-drawn along each length.

Locking couplings include both a male outer tube thread and a female wireline drill rod thread connection, in order to mate directly to the drill rod string.

Boart Longyear’s proprietary Q and RQ™ wireline drill rod joints utilize tapered threads for easy make and break, and feature engineered thread forms, a precise interference fit, and a unique combination of heat treatments to maximize load strength and wear resistance.

As is well understood across the wireline drilling industry, in order to avoid joint failures, never inter-mix genuine Boart Longyear drill rods, couplings, or adapters with products produced by unlicensed third parties.Ready to look into Boart Longyear"s rods?This article originally appeared in Coring Magazine.

The China overshot assembly is mainly used for pulling up inner tubes inside core tubes. And we offer various overshot assemblies for clients all over the world, such as S56,S59, S59B, S75, S75B, S75-SF,S95, S95A , CBH, CNH and CNH(F) CSH overshot assembly.

We will pack the overshot assembly in accordance with customers" requirements. And for those to be exported, they will be packed by export-standard plywood boxes.

As a professional manufacturer of China overshot assembly in China, Wuxi Drlling Tools Factory still provide customers worldwide with hoisting plug, foot clamp, circle wrench, diamond circle wrench, etc. All of our products have passed the certification of ISO9001: 2000 and API 5DP. With high quality and competitive price, our products have been well received by customers from Mongolia, Kazakhstan, Russia, Iran, Afghanistan, Oman, Turkey, Thailand, Vietnam, Myanmar, Malaysia, Indonesia, Singapore, Taiwan, Colombia, Mexico, Brazil, Canada, Australia, etc. If you"re interested in our China overshot assembly, please contact us freely.

C-Q series Overshot AssemblyThe C-Q series overshot assembly is a kind of tool specially used to salvage and place inner tube assembly. At present, we have four kinds of C-Q series ...

China Overshot AssemblyThe China overshot assembly is mainly used for pulling up inner tubes inside core tubes. And we offer various overshot assemblies for clients all over the ...

6. Lower the drillstring and lartch onto the fish. Do not locate or engage the logging tool with more than 20 000 lbs or the weight advised by the Logging Contractor. A pressure increase shall indicate if the fish is caught in the overshot. A cable head tension increase when lowering the drillstring, or a decrease when pulling the drillstring indicates that the fish is connected.

7. Observe the cable tension. If the tension drops, there is a good chance that the fish has been latched on. Repeat this procedure a few times to make sure this is the case. If there is no drop in tension, Go down with the overshot a little deeper than before and repeat the procedure.

We export impregnated and surface set diamond core bits, diamond casing and casing shoe bits, reaming shells, core barrels, drilling rods, overshots to world wide countries, such as USA united states, Germany, UK united kingdom, Italy, France, Turkey, Russia, Ukraine, Canada, South Africa, Philippines, Cambodia, Thailand, Malaysia, Australia, New Zealand, South Korea, Japan, Israel, Cyprus, Finland, Sweden, Norway, Danmark, Poland, Czech, Hungary, Switzerland, Ireland, Holand, Greece, Croatia, Spain, Portugal, Egypt, India, Singapore, Indonesia, Saudi Arabia, United Arab Emirates, Mexico, Brazil, Colombia, Peru, Chile, Argentina etc.

Product Description Our overshots are good quality ,specifications as follows:BQ,NQ,HQ,PQ,BTW,NTW,HTW,AQ,S75,S75A,S95,S95A Product show Company Information

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