pulling unit vs workover rig price

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Well Service | Workover Rigs - 844/80 Double drum draw works. looks to be recently rebuilt. Has new Lebus Grooving on Tubing Drum. Comes w/ 250 HP 2 speed jackshaft/RA BOX. More Info

Well Service | Workover Rigs - CARDWELL KB200B Freestanding Oilfield Workover Rig / Service Rig / Pulling Unit, Service Rigs, Used Cardwell KB200B Freestanding Service Rig, 5 Axle Carrier, Detroit 8V71... More Info

Well Service | Workover Rigs - WELL SERVICE RIG - COOPER 350 Well Service Unit p/b DETROIT 8V-92 Diesel Eng, ALLISON 750 Trans, 42X12-38x8 DRAWWORKS w/dual disc assist, 97’ 200,000# Telescoping M... More Info

Well Service | Workover Rigs - CROWN 350 SERIES -- SERVICE KING 104" 205,000# DERRICK, CAT3406, ALLISON 5860,38X10 DOUBLE DRUM DRAWWORKS, CROWN SHEAVES REBUILT 2013 MAIN26”X4,SANDLINE 22”, NE... More Info

Well Service | Workover Rigs - 2008 Crown/Cabot 1058 Service unit mounted on 4 axle carrier w/Detroit 60 Power. New 5860 Drop Transmission. 72" Double rod/single tubing Derrickmast 125000# Rig is in Ex... More Info

Well Service | Workover Rigs - WELL SERVICE RIG - FRANKS 1287-160-DTD-HT D/D Well Service Unit p/b DETROIT 8V-71N Diesel Eng, ALLISON CBT-4460-1 Trans. SERVICE KING 96" 180,000# Hydraulically Raised & ... More Info

Well Service | Workover Rigs - FRANKS 300 D/D 1287 w/hydromatic brake, Well Service Unit p/b DETROIT 8V-71 Diesel Eng, ALLISON 750 Trans, (Reman Dec 2011) FRANKS 96’H 150,000# Tri-Scope Telescopin... More Info

Well Service | Workover Rigs - FRANKS 658 D/D Well Service Unit p/b CAT 3406 Diesel Eng, ALLISON HT-750 Trans, FRANKS 96’H 180,000# 4-Leg Telescoping Mast, Hydraulically Raised & Scoped w/4-Sheave... More Info

Well Service | Workover Rigs - FRANKS 658 D/D Well Service Unit p/b Series 60 Detroit Diesel Eng, ALLISON 5860 Trans, 102’H 225,000# (on 4 line) Telescoping Mast, Hydraulically Raised & Scoped, Db... More Info

Well Service | Workover Rigs - IDECO H35 96̢۪ 210,000 MAST, DETROIT 60 SERIES ENGINE, ALLISON 5860 TRANSMISSION, REFURB 2005, IDECO DERRICK REPLACED WITH NATIONAL DERRICK, TUBING DRUM CON... More Info

Well Service | Workover Rigs - IDECO RAMBLER H-35 Oilfield Workover Rig / Service Rig / Pulling Unit, Service Rigs, Used Ideco Rambler H-35 workover rig / service rig / pulling unit, 4 axle carrier, De... More Info

Well Service | Workover Rigs - 2015 INTERNATIONAL PAYSTAR 5900 Flushby Unit. C/w 2003, Refurbished in 2015, Western Fab Ltd. flushby unit, s/n 03-09-1008, 50 Ft. Mast height, 50,000 lb. pull rating, fr... More Info

Well Service | Workover Rigs - 2005 KENWORTH T800 Flusby Unit. C/w Lash Ent. flushby unit, 47 ft mast, slant compatible, 3x5 Gardner Denver triplex pump, 5000 psi, 2005 Advance 8m3 tank, TC 406 code, P... More Info

Well Service | Workover Rigs - 2003 KENWORTH T800 Flushby Unit. c/w Online flushby unit, 47 ft. mast, slant compatible, Pullmaster HL25 wotking winch, Pullmaster PL5 catline winch, 2002 wabash two comp... More Info

Well Service | Workover Rigs - 2005 KENWORTH T800B Flushby Unit. c/w Online flushby unit model 50-50, s/n 24641, 40 ft. mast,Salnt compatable, Pull master HL25 and PL5 winch, Gardner Denver 3x5 triplex... More Info

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Pumping services tend to get more expensive offshore, because of the degree to which the equipment must be assembled on location. Wire based services still require assembly, but because the parts are smaller can usually be mobilized in larger ‘chunks’ thus requiring less assembly on location. On land, fluid pumping equipment is much more readily portable on trucks or trailers. Workover rigs on land are incredibly cheap in most places as measured on a per diem basis. Part of their advantage is that they arrive to location with most of their key components already assembled in/on one truck. This advantage disappears offshore where the rig must be assembled on site first.

Paying for a drilling rig or intervention vessel is the price of gaining physical access to the well. Everything else must be added to it to get physical access to the general area and then gain access to the well. There is no need for various forms of standalone pumping services because the vessel or rig will already have a cementing unit and/or the mud pumps available for that sort of work.

Performing the same operation over and over again has significant cost savings attached to it. Once the correct housing and supply arrangements are in place, and all the necessary people and equipment have been assembled, continuing to use it altogether ‘as is’ can save an enormous amount of money compared to dispersing it all and starting over again later. For land operations, this is most pronounced in areas where reservoir, surface, and operational practices allow for grouping wells together in relatively small areas, and for clustering well pads. Depending on what work is being done to the wells and how close together they are it may be possible to ‘hop’ from one well to the other without ever moving the equipment on a road or doing a complete rig-down.

Deepwater operations can benefit from this too, but not as much as ‘traditional’ fixed or surface access facilities, because the overall day rate of the rig or intervention vessel is often much higher, and the process of switching between wells is often much lengthier.

On land, you hire the unit and crew, and a small diem fee is added to the cost of employing them so they can stay in a hotel and get food when they are not working. The crews will transport themselves to and from the well and move the equipment to and from the well also.

The costs of conducting business in each of these 3 areas tend to scale very roughly in factors of 10. 100 wells making 50 bbls of oil each on land is a cash cow. Offshore that is a disaster, because the cost of servicing those wells is prohibitive. A more reasonable scenario is 10 wells making 500 bbls of oil each. In deepwater, a well making 500 bbls of oil a day is an abandonment candidate, if indeed it got that far along before abandonment. One well making 5,000 bbls a day is more. The direct cost of hiring (for example) a snubbing unit do not scale by factors of 10, but the overall cost of employing a snubbing unit do. As a result, different types of well servicing make sense in one area which may not make sense in another. On land in areas with ordinary access to infrastructure (not the Sahara or Alaska) operations like slickline are often so cheap that they are a routine procedure, with preventative or predictive maintenance schedules to scrape away paraffin or remove small amounts of scale. By contrast, it is completely cost prohibitive to try and attempt to perform similar work in deepwater – you either design and operate the well in such a way that paraffin and scale do not build up in the wellbore at appreciable rates, or you P&A the well. The cost of routine mitigation is simply too high. The relative cheapness of most workover rigs on land is another major factor. Many types of operations which could in theory be carried out in some other way are done with a workover rig simply because it is the most cost-effective technique, even if other methods might be faster, or involve fewer people. The relatively high cost of a rig for offshore facilities means that in most cases every effort short of getting a rig is tried first. Then a catalogue or list of operations to be conducted by a rig at a given facility will be gradually built up over time until they reach a critical level. At that point, a rig will be sent out to conduct all the operations which only it can perform, moving from one well another to save costs by making the work repeatable.

WILSON WELL SERVICE RIG  (Ref#3000Ta)  103’ x 248,000# derrick, Out of service since 2017, lot of rust, will start and run and/or drive down the road POR

Refurbished, 700 hp, Double drum 2042 drawwroks with Parmac 202 brake assist, (2) Caterpillar 3406 Engines, (2) rebuilt Allison 750 6 speed auto transmission with reverse. 112" x 300,000 # hook load capacity on 8 lines, clear height 97 feet, leg spread  7" 6-1/2", racking board, oil bath chain case, elevated rotary drive, all raising lines and guidelines. The Draw-works, hydro-mantic break, and crown assembly have been rebuilt. Heavy duty Draw works drive propeller shaft through right angle gear box, rotary drive propeller shaft, heavy duty reverse gear box and oil bath roller chain, and a self-locking handling winch.  Mounted on triple front axle mechanical 6 axle carrier with 134,000# capacity designed to meet highway safety standards with necessary toughness for off road operations.  Price:  $265,000

Derrick fell onto rig when being raised, derrick would need to be replaced or repaired.  Built 1981, double drum, 42 x 12, 42 x 8, swab drum removed from jack shaft, 5-axle back in carrier, 250,000# derrick with double racking board and triple rod basket, Cat 3408, CLT 5860 transmission, Cooper right angle box, 4 hydraulic leveling jacks, air rod transfer in derrick, hydraulic winch, Kerr 6 cyd 10000 psi Mustang pump powered from jack shaft, Kerr 3-valve release 10,000 psi, tong carrier f/Foster, steel work platform, Parmac 22 SR hydromatic brake.  Extra rebuilt 3408 Cat engine.  Price as is:  $112,500

Manufactured 1981, mounted on 5 axle carrier, double triple service rig, 96’ x 250,000# derrick, Detroit Series 60 12.7 diesel engine, Allison transmission, 9/16” sandline, 1” drill line,  hydraulic jacks, hydraulic catwalk, travelling block, tubing bard, rod basket and all necessary lines.  Tooling not included.  Price:  $115,000

Manufactured 1983, double drum, 96’ x 180,000# derrick, mounted on 5 axle carrier with 92T engine, Allison transmission  Price rig only:  $300,000  Price with tooling:$340,000

WILSON 42 WELL SERVICE RIG(Ref#7562Ta)  Manufactured 1975, 180,000# Pemco double/triple derrick, mounted on Wilson carrier with Detroit 8V71 engine, 4 hydraulic leveling jacks, ready to work  Price rig only:  $74,500  Price with tooling:  $94,500

Manufactured 1983, 70" x 120,000# non telescoping stiff mast, double drum 26 x 8, Detroit 6V71 diesel engine, 740 Allison transmission with Spicer power divider, mounted on 4 axle carrier.  Rig runs and truck drives, stacked for several years, good condition  Price:  $93,500 USD

FRANKS 500 WORKOVER RIG(Ref#7615Tc)  Built 1980, refurbished 2018, 102" x 250,000# mast, mounted on 5 axle carrier, new engine and transmission, 150 ton blocks, 15,000’ sandline, ready to work  Price:  $495,000

FRANKS 300 SERVICE RIG(Ref#1169Ta)  4-legged derrick, Series 60 Detroit engine, 6850 Allison transmission, blocks, Foster tongs, mounted on 4 axle carrier, working condition  Price:  $37,500

WILSON MOGUEL 42 WELL SERVICE RIG(Ref#3177Tb)  Two available, 96" x 280,000# mast, Detroit Series 60 engine, 5860 Allison transmission, mounted on 5 axle Wilson carrier, handling tools  Price:  $315,000

Workover rig with 83’ telescoping derrick, 10’ crown extension, 200,000# lift capacity, 100,000# snubbing capacity.  Catwalk with 42’ reach, forward and revere motion, hydraulic pipe slide, six portable pipe racks, powered by workover rig.  5000 ft/lb hydraulic rotary, 15k psi working pressure capability kelly hose, 300 ton mast with 5 x 5 heavy wall box tubing and 2 x 2 heavy wall cross sections, (2) mast raising cylinders, 9-1/8 x 25’ telescoping cylinders/crown sheaves with cable guides, (2) winch sheaves/snubbing sheaves, SRS fall protection, retractable flow tube design, non-swivel boom pole on curb side winch, (2) mast supports, 1” lifting cables, mounted on 5 axle Crane Carrier (3rd axle drop), with 375k Volvo Penta engine, 150 gal fuel capacity, hydraulic self-leveling components, 6 speed Allison transmission, 1:1 gear box, (2) 65 gpm pumps, (2) 30 gpm pumps, (1) 28 gpm Commercial shearing pump, 40 gal accumulator storage, single man cab, hydraulic leveling jacks  Price on Request

Manufactured 1960’s, double drum, single rig mast, 64’ x 250,000# (tubing and rod racks), 70 ton blocks, 2 lines, Detroit diesel 60 gpm @ 2000 psi, hydraulic system, air clutch.  Rig was refurbished 2013/2014 at a cost of $130,000: repairs included used 65’ derrick installed, new 1” main line, repairs to air system, hydraulic system upgrade, leveling jacks, derrick ljghting, tires, 70 ton blocks installed.  But the rig has been sitting since 2015 and now needs rebuilding. It doesn’t run.    Price as is: $19,500

Manufactured 1980, completely refurbished 2004, 5 axle double drum well service unit, double 15 Parmac brake on main drum, 96" x 180,000# hydraulic raised mast, mast lighting, Detroit 60 Sereis engine, 5860 Allison 6 speed transmission, 4 hydraulic leveling jacks, dual manual outriggers, PD12 Braden utility winch, McKissick 100 ton tubing block 21-31 diving, 1000" of 1" tubing line, 13000" of 9/16" sandline  Price:  $225,000

CARDWELL KB200B SERVICE RIG(Ref#11674Ta)  72’ x 140,000# stiff mast, 40 x 10 double drum drawworks, 2 aux deck winches, tubing board, rod board, cat walks, railing, stairs, floor BOP controls and accumulator bottles, McKissick 75 ton tubing block and hook, mounted on 5 axle carrier, Detroit 8V71 diesel engine, Alliston CLBT4460 auto transmission PRICE:  $127,500

Rig manufacture 1980, mounted on 1980 GMC Brigadier with Cat 3208 engine, includes elevators & misc tools, also includes 1996 1-ton Super Duty tool truck, tandem axle, Cat 3208 diesel, sitting 1-1/2 years  Price:  $92,500

1980, 475 hp, single drum (new), reworked, 96" x 205,000# hydraulically raised mast, 6 lines,  crown block: 3 new sheaves blocks and bearings, racking board, guide wires, (2) hydraulic hoist, weight indicator, block, elevator links, fall safety device, work platform, mounted on 4 axle carrier with Detroit Series 60 diesel engine, Allison transmission, rig in excellent condition and has been well maintained, ready for use   PRICE: $115,000

SKYTOP BREWSTER RR400(Ref#13190T) Mounted on 4 axle carrier, single drum drawworks, 8x7 disc assisted brakes, tubing board, Cat3406B engine, Allison 860DB transmission, 100 ton McKissick block, Foster 58-92R tongs, misc hand tools, approx 36" base beam for rig, ready to work  Price:  $110,000

Refurbished 2017, 4 lines, 96’ x 205,000# mast, 8V71 Detroit engine, mounted on CCC, 75 ton McKissick blocks, tubing board, rod basket, work platform, rigged up and working in field  Price:  $295,000

Manufactured 1977, 72’ x 125,000# derrick, 8V71 Detroit engine (rebuilt), Allison 750 transmission, 6500’ of new 5/8” sand line, tubing line new, drum brakes new, new style McKissick blocks, working daily  Price rig only:  $157,500

Double drum drawworks with hydromatic brake, 10" brakes, 96" x 180,000# derrick, mounted on 4-axle PEMCO carrier with hydraulic support legs, 8V71 Detroit, 4460 Allison transmission, Spicer 784 split shaft gearbox, 250 hp right angle drive, 650" of 7/8" tubing line, 8000" of 9/16" swab line, 100 ton Sowa block, hydraulic winch, hydraulic weight indicator, 84" links, 2-3/8" and 2-7/8" tubing elevators, BJ tubing slips, Foster 5893R power tongs with lift in derrick, rod hook, rod stripper, rod elevators, wrenches, transfers, rod fishing tools, misc hand tools and connections  Price:  $140,000

Manufactured 1974, double drum drawworks,  double triple 96" x 180,000# derrick with a hydromatic. The rig has working line with heavy traveling block and approx. 12,000" 9/16 sand line. Mounted on Skytop carrier with tandem steering and rear ends 4 axles W/ tag axle, 4 leveling jacks, powered by an 8V-71 with a Allison 4460 transmission, (note transmission was overhauled in early 2000"s) and the engine has a new head on right bank. The rig has two leveling jacks on the rear and two leveling jacks on the front which are located right behind the steering axels. Tooled out with hydraulic rod and hydraulic tubing tongs, air slips, rod and tubing elevators, hand tools and misc over items. PRICE REDUCED:  $115,000

10 x 13 pole, double Drum, Franks 33” air over grease, brakes in good shape, 7/8” tubing line, tubing blocks, tong pressure adjustment, hi/low on tubing, air slips control, master kill on drawworks, Foster 36 with 8’ lift ram, air backup, swing around tong rack, mounted on 2001 Freightliner F80 truck, Cat C12 Series 3125, Fuller 9-speed transmission, PTO, winch for pole scope Tulsa 48, blocks raise pole, dual fuel tank, dual battery, 50 gal hyd tank, toolboxes, hydraulic outriggers, BJ rod tongs, ¾” and 7/8” heads, tools, swabs, extra tongs, orbits, drilling head  Price:  $242,500

Double drum (second drum is removed, rig is running as single drum), hyd pole and down riggers, mounted on 1990 Crane Carrier, 9 sp Eaton Fuller transmission, 100,000 miles, 8 x 10 telescoping poles, 3/4” cable, no tooling  Price:  $52,500

10 x 13” pole, single drum, mounted on 1980 Brigadier 9500 Series truck with 671 inline Detroit, drop box, travelling blocks, tubing lines, hyd jacks, no tooling, sitting since 2000  PRICE:  $49,500

Cable Tool Drilling and Completion Rig, 60" double poles rated to 150,000#, 5000" drill capacity, 10,000" pull capacity, propane Waukesha 145 engine, 500 gal propane tank, trailer moutned with International 4300 truck, last drilled 2012, 2300" drill line on drum, 3500" on spool casing drum, heavy block sandline drum, cat heads each side, tooling, spare engine  Price:  $72,500

400’ of 7/8” block line, 9/16” sandline drum (no cable), 2000’ of ¾” drilling drum, 3 McKissick sheaves, air clutches and controls, mounted on 1961 Mack truck with 250 hp Cummins engine, older rig but runs good.  Includes elevators, oil saver pump, no BJ tongs, currently working.  Price:  $87,500 - Pennsylvania

Triple drum, friction clutch, cathead (sandline holds 2400’ of 5/8” line), mounted on tandem axle Chevy truck with 427 gasoline engine, 8-5/8” x 45’ single pole, new tires, power steering, wireline unit, good usable rig for shallow oil/gas lease, drills, workover, swab capabilities, no tools  Price:  $112,500 - Oklahoma

Used Mainland M-32 Freestanding Service Rig, 4 Axle Carrier, Detroit 6V-71 Diesel Engine, Allison HT750 Auto Transmission, 69" Stiff Mast, 120,000 lbs. rating, 32x7 Double Drum Draw-works, 2 Auxiliary Deck Winche...

Used Cardwell KB200B Freestanding Service Rig, 5 Axle Carrier, Detroit 8V71 Diesel Engine, Allison CLBT4460 Auto Transmission, 72" Stiff Mast, 140,000lb Pull, 40 x 10 Double Drum Draw Works, 2 Auxiliary Deck Winc...

Used Ideco Rambler H-35 workover rig / service rig / pulling unit, 4 axle carrier, Detroit 8V-71 diesel engine, Allison CLT 5860-DB automatic transmission, 95" Ideco telescoping derrick, 212,000lbs hook load, 42x...

Used MR-350 Mountain Rig pulling unit / workover rig / service rig, Cat 3406T Diesel Engine, Allison CLBT-5860-2 Automatic Transmission, 104" Pemco Telescoping Double Derrick, 225,000lb Hook Load, 42x10 Double Dr...

Seller refurbished: The item has been restored to working order by the eBay seller or a third party. This means the item was inspected, cleaned, and repaired to full working order and is in excellent condition. This item may or may not be in original packaging. See seller’s listing for full details.See all condition definitionsopens in a new window or tab

While hydraulic workover (HWO)/snubbing will never wholly replace traditional workover rigs, particularly in dead well applications requiring multiple trips and fishing jobs, in live and pressured well re-entries the technology offers myriad operational; economic; and health, safety, and environment advantages. From its inception solely as a mechanism for handing tubulars during well control operations, hydraulic snubbing technology has evolved into a mechanism that can perform any operation once considered the sole jurisdiction of conventional drilling and workover rigs.

The ability of modular HWO/snubbing units to pull existing completions, drill open holes, and re-complete a well bore at flowing (near-balanced or underbalanced) conditions has effectively bridged the technological gap between derrick equipment configurations and coiled tubing (CT) units. Consequently, standalone or rig-assisted HWO/snubbing units have been employed successfully in a variety of activities worldwide, from re-completions and completions under pressure to tubing-conveyed perforating to the drilling of sidetracks, slim holes, and well deepening operations, among others.

Together with its capacity to rotate pipe in live well conditions and perform intervention operations without having to shut in production entirely, HWO/snubbing units can often be mobilized and de-mobilized in a fraction of the time and associated costs of a conventional workover rig.

Key to the comparably faster and more cost-effective mobilization and de-mobilization is the modular design that allows HWO/snubbing units with up to 600,000 lb hook load and rotary torque in excess of 14,000 ft/lb to be transported easily by air, sea, or over land. Accordingly, the modular design, in tandem with a comparatively minimal footprint as small as 2,500 sq ft (753 sq m), makes the technology an ideal contender for applications on remote offshore platforms.

Depending on the wellhead equipment, one of the foremost drivers for the growing use of HWO/snubbing units is a design engineered specifically to operate under pressures as high as 20,000 psi. Consequently, operators can perform a variety of well intervention operations without having to first kill the well and discontinue production completely.

Compounding the costs associated with lost production is the expense of killing the well and re-initiating production once the re-entry operation is completed. By way of illustration, installing a completion string after a typical fracturing job requires that the operator first employ high-density fluid to kill the well. In addition to the costs of the brine and kill pump are the rig-related expenses associated with running the pipe in the well bore. Afterwards, a CT unit and nitrogen may have to be used to re-start production, magnifying the costs even further.

By comparison, an HWO/snubbing unit normally can perform the same operation in one to two days with production continuing while the operation is under way. All things considered and depending on the specific application, employing an HWO/snubbing unit generally is more cost-effective on new and producing wells than a conventional workover rig and is less than that of the daily rate for a CT unit.

Moreover, with HWO/snubbing technology, the operator avoids the costs and potential environmental liabilities associated with the onshore/offshore disposal of heavy-weight kill fluid. Also from an environmental perspective, since less equipment is required on location, operators do not have to flow the well to atmosphere to maintain pressure control, thus further reducing the carbon footprint. Since the units do not require any water from nearby streams or underground aquifers, hydraulic snubbing is especially beneficial in areas where water is a premium or scarce resource.

Contemporary hydraulic snubbing technology bears little resemblance to the units introduced in 1929, only 10 years after the development of well cementing. Those first units comprised little more than a series of cables, sheaves, and counterweights and were used strictly for well control operations and snubbing in live completions.

At their conception, snubbing units relied on a rig’s drawworks to hoist pipe in and out of the hole, and the sheaves were rigged up so that as the traveling blocks hoisted upward, the pipe would be snubbed into the well. Conversely, lowering the traveling blocks brought the pipe out of the hole.

Over the years, increased understanding of hydraulics resulted in the development of the “concentric” snubbing unit, which consisted of a hollow hydraulic cylinder. This design also created the first pipe guide that prevented the buckling that plagued earlier units and allowed operators to work on higher-pressure wells with longer strokes, which reduced the time required to complete the job.

Soon afterwards, the first multicylinder snubbing unit was developed, which was a prototype of the system used today. The industry also developed specialized slips and blowout preventers (BOPs) configured for the purpose of snubbing/stripping. As the unit designs progressed, they incorporated stronger gin poles and hydraulic rotary tables. Today, a standard HWO unit can be transformed into an HWO/snubbing unit in an hour with the simple addition of two sets of slips and a tubing guide.

The steady progression of hydraulic snubbing coincided with drilling advancements that have led to the widespread construction of ultraextended-reach drilling, multilaterals, and other unconventional wells that all too often are outside the capability of conventional service tools and technologies. In unconventional plays and well configurations, the advantages of HWO/snubbing to more conventional CT units, for example, are evident. Unlike CT, the ability to rotate the pipe and work string dramatically reduces wall-to-wall frictional drag. In turn, minimizing friction increases depth capability significantly, crucial in laterals that extend past 3,000 ft (915 m).

Elsewhere, in an oil producer offshore Dubai, the technology was used in a live re-completion encompassing tubing-conveyed perforating (TCP) guns and acid stimulation at a well depth of 9,500 ft (2,898 m). After pulling the completion, the operator was able to run a cast-iron bridge plug and TCP guns before perforating. After successfully performing the acid stimulation, the hydraulic snubbing unit was used to run the re-completion assembly. From rigup to rigdown, the operation required 15 twelve-hour days.

The technology also was applied in a dry and pressurized re-completion of an onshore 16,000-ft (4,880-m) deep gas well in Sharjah. After the tree was frozen and removed, the BOP stack was installed and the 5-in. production string pulled from the hole. Afterwards, a tapered 27?8-in. to 31?2-in. production string was run in the hole to 8,500 ft (2,593 m), at which time a retrievable bridge plug was used to isolate the reservoir from surface to change out the hanger spool. The remaining completion installation was completed with 31?2-in. production tubing. The entire operation, including rigup and rigdown, was completed in 11 days.

In oil and gas recovery operations, tubular members are usually run or pulled using a workover rig or a snubbing unit. Workover rigs are basically small drilling rigs having a derrick and drawworks, and although they are less expensive to employ than full-sized rigs, their use can still be quite costly.

Snubbing units are smaller, easier to transport and less expensive to operate than workover rigs and are often employed when working a pressurized well that requires tubular members to be forced into the wellbore.

A viable alternative that improves safety and efficiency during snubbing operations consists of a power tong set, with lead and back-up tongs that are mounted on the slip bowl of the traveling jack head of a snubbing unit and rotates with the slip bowl. Service lines for the tong set are not connected during string rotation.

In another version of this type of device, a fluid feed-through swivel is mounted on the tong set, secured to the necessary tong operating and control service fluid lines, such that the tong set can rotate with tong service lines between the tong set and the snubbing unit attached during rotation.

Snubbing is an old technique dating back to the late 1920s in the United States that was primarily used in emergency situations, such as blowouts or uncontrolled wells.

The snubbing unit therefore offers better flow capacity, breaking load and rotation capacity and is able to put weight on the downhole tool. In contrast, tripping takes longer because the lengths of pipe have to be screwed together and the procedure for running the connections through the safety stack on the wellhead may be slow and represents a high risk for personnel if not done properly.

A snubbing unit consists basically of a pipe-handling system, a wellhead safety system, a hydraulic power unit and the downhole accessories incorporated into the snubbing string.

With the traveling slips closed and the stationary ones open, the pipe can be tripped over a length corresponding to the stroke of the jacks. Then, all that is required to bring the jack back to its original position is to close the stationary slips and open the traveling slips. After the traveling slips have been closed again and the stationary slips have been opened, the operation can continue.

No tong pole and no pushing or pulling of the tong on and off the pipe is necessary, which eliminates nagging injuries (broken or mashed fingers, twisted or strained backs, shoulder damage) and significantly improves the efficiency of the operation.

The jack head tong carries the provision of having a three-section cage plate system that can be removed to allow the jack head tong to be open for full wellbore capabilities, matching the BOP’s bore. This is the fastest and safest way to trip pipe with a snubbing unit.

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We like to throw around “blog ideas” over here at Croft to help my fellow blog partner, Amy and I have a new fresh blog every week. We try to keep our readers up to date with both the new and the old.  Someone threw out the idea of writing about a workover rig. Still being new to the industry, I snatched this topic up because I simply wanted to learn more about it myself!  My main focus for this blog is simply discussing what is a workover rig and why it is important.

First off, maybe you know a workover rig by a different name. They can be called completion wells or pulling units. I just want to try to avoid any confusion! I am going to give Wikipedia’s definition first and then break it down to layman’s terms for those of you who don’t quite understand what the Wiki is trying to say (Like me). According to Wikipedia, “The term workover is used to refer to any kind of oil well intervention involving invasive techniques, such as wireline, coiled tubing or snubbing. More specifically though, it will refer to the expensive process of pulling and replacing a completion.” Let’s break down some of that Terminology…

Snubbing: This method is used in more demanding situations when wireline and coiled tubing does not offer the strength and durability needed. Snubbing runs the bottom hole assembly on a pipe string using a hydraulic workover rig.

So basically, the purpose of a workover rig is to replace a well with a fresh completion. This may have to happen due to the well deteriorating or the changing of reservoir conditions. This is performed if a well completion is unsuitable for the job at hand. An example of the well deteriorating is the equipment may have become damaged or corroded such as production tubing, safety valves, electrical pumps, etc. An example of the changing of reservoir conditions maybe if the flow of a well has decreased over time. If this happens, when the well was originally drilled, it was fit for tubing that was big enough for a higher flow of oil and gas. As the flow decreased, smaller tubing is now needed.

For a workover to take place, a well must be killed or in other words, stop the flow of oil or gas. This is an intense procedure for a workover to take place, so they are planned long in advance.

RMC1JWE0–Cuadrilla Resources drilling equipment & workover derrick rig at Shale Gas well Drill Site, Presse Hall Farm, Singleton, Blackpool, Lancashire, UK