pulling unit vs workover rig factory

Workover rigs, also called pulling unit rigs, are specialized oil rigs set up for inserting or pulling pipe tubing in and out of wells. Workover crews are called when an oil well has been drilled, is undergoing repair or is being retired, as indicated by Schlumberger.

These crews are relatively small compared to other rig crews and consist of tool pushers, operators or relief operators, derrick men and floormen or roughnecks. The average workover rig salary overall was ​$65,039​ as reported by Simply Hired in 2022. Available workover rig jobs and descriptions can be found on the Rigzone website.

The acting supervisor on a workover rig is called the tool pusher. The main task of a pusher is to hire, fire and supervise contracting work crews. When contractors have an issue on site, the first person they report concerns to is the tool pusher. Pushers need to have an intimate knowledge of how each and every part of a rig works, both individually and as an overall part of the drilling operation as a whole.

If equipment fails or needs to be reordered, the tool pusher talks with suppliers to get the right parts out on site with a minimum of downtime for the rig. The pusher is responsible for the overall safety of a rig. If the tool pusher has any safety concerns, he has the power to halt production until the concern is resolved.

The operator/relief operator is next in order of responsibility to the tool pusher on a workover rig. The main task of an operator is to control the crane and derrick that hauls pipe in and out of the bored well. In smaller crews, the operator is also the one who drives the rig truck. When laying pipe into a well, the operator directs the truck or derrick to the optimum spot next to the bore opening.

The operator then instructs the derrick hands and roughnecks where to place the bore pipe for easy access by the crane or by hand-loading methods. During a well breakdown or repair, the operator directs the crew hands in storage of extracted pipelines. Because the operators work most closely with derrick hands and roughnecks, they are typically responsible for selection and maintenance of their immediate workover rig crew.

In the pulling unit rig crew hierarchy, the derrick hands come after the operator/relief operators. The main responsibility of a derrick hand is everything that is above ground on the rig. During laying operations, derrick hands assist the operators/relief operators in inserting boring into the well. During repair or breakdown, they assist the operator in pulling pipe out of the well and storing it properly.

In between laying, derrick hands have other responsibilities as well, depending on the size of the crews. In smaller crews, Derrick hands also see to the maintenance of the rig-based electric and diesel generators necessary to power rig equipment.

At the bottom of the pulling unit rig crew in terms of seniority is the floorhand or roughneck. The main task of a roughneck is to perform any kind of tasks asked by either the derrick hand or the operator. These tasks can range from assisting with laying new pipe or removal of old tubing, general construction, to moving new equipment, such as generators. Most crew members on a work-about start their career as a floorhand or roughneck before working their way up to more senior positions.

The rig assist unit was installed on top of the rig’s Bops. A landing joint was lowered into the stack and screwed into the tubing hanger. The snubbing Bops were tested using the rig pump to 35mpa

The stack was equalized using the snubbing unit equalize line to well bore pressure. The hanger hold-down screws were backed out and the tubing hanger staged out using the snubbing units annular and stripping rams

Every tubing connection was staged out of the hole using the stripping rams and annular. The pressure at 21mpa made pulling the connections through the annular with pressure under it unwise. Before the connection was pulled through the annular, the lower stripping rams were closed and the pressure between the rams and annular vented to flare. Once the connection was through the annular element, the chamber between the Bops was re-equalized and the stripping ram opened. This process was repeated for every connection

Once the lift force from the well overcame the weight of the string, the snubbing unit took over pipe movement. The tubing connections were still staged out and the pipe continued to be racked in the derrick

The joint was gently snubbed up until the fill/flow sub was above the snubbing unit annular element. The operator continued to raise the tubing until the lower connection of the 3m pup joint engaged the bottom side of the stripping rams. The rams were locked and the chamber between the stripping rams and annular was re-equalized

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Rig means the vessel described in Recital (A) hereto and includes any share or interest therein and her engines, machinery, boats, tackle, outfit, spare gear, fuel, consumable or other stores, belongings and appurtenances whether on board or ashore and whether now owned or hereafter acquired (but excluding therefrom any leased equipment owned by third parties);

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HSI was the first oil well service equipment manufacturer to design and fabricate a truck mounted well service rig with a square mast. Our service rig has proven to be one of the toughest and most reliable rigs on the market. Our engineers and knowledegeable staff will solve your rig issues and get. you up and running right away. The oilfield doesn’t stop, can’t stop, and we understand the need to get back out there.Whether your rig needs some minor repairs or a complete rebuild, we can help.  We also stock rig tooling and rubber products for various types of equipment.   Rely on us for your rig assembly and repair needs. Let our 3 decades worth of experience work for you!

This article is about the onshore oil rig. For offshore oil rig, see Oil platform. For drilling tunnels, see Tunnel boring machine. For handheld drilling tool, see Drill.

A drilling rig is an integrated system that drills wells, such as oil or water wells, in the earth"s subsurface. Drilling rigs can be massive structures housing equipment used to drill water wells, oil wells, or natural gas extraction wells, or they can be small enough to be moved manually by one person and such are called augers. Drilling rigs can sample subsurface mineral deposits, test rock, soil and groundwater physical properties, and also can be used to install sub-surface fabrications, such as underground utilities, instrumentation, tunnels or wells. Drilling rigs can be mobile equipment mounted on trucks, tracks or trailers, or more permanent land or marine-based structures (such as oil platforms, commonly called "offshore oil rigs" even if they don"t contain a drilling rig). The term "rig" therefore generally refers to the complex equipment that is used to penetrate the surface of the Earth"s crust.

Small to medium-sized drilling rigs are mobile, such as those used in mineral exploration drilling, blast-hole, water wells and environmental investigations. Larger rigs are capable of drilling through thousands of metres of the Earth"s crust, using large "mud pumps" to circulate drilling mud (slurry) through the drill bit and up the casing annulus, for cooling and removing the "cuttings" while a well is drilled. Hoists in the rig can lift hundreds of tons of pipe. Other equipment can force acid or sand into reservoirs to facilitate extraction of the oil or natural gas; and in remote locations there can be permanent living accommodation and catering for crews (which may be more than a hundred). Marine rigs may operate thousands of miles distant from the supply base with infrequent crew rotation or cycle.

Antique drilling rig now on display at Western History Museum in Lingle, Wyoming. It was used to drill many water wells in that area—many of those wells are still in use.

Until internal combustion engines were developed in the late 19th century, the main method for drilling rock was muscle power of man or animal. The technique of oil drilling through percussion or rotary drilling has its origins dating back to the ancient Chinese Han Dynasty in 100 BC, where percussion drilling was used to extract natural gas in the Sichuan province.Edwin Drake to drill Pennsylvania"s first oil well in 1859 using small steam engines to power the drilling process rather than by human muscle.Cable tool drilling was developed in ancient China and was used for drilling brine wells. The salt domes also held natural gas, which some wells produced and which was used for evaporation of the brine.

Oil and natural gas drilling rigs are used not only to identify geologic reservoirs, but also used to create holes that allow the extraction of oil or natural gas from those reservoirs. Primarily in onshore oil and gas fields once a well has been drilled, the drilling rig will be moved off of the well and a service rig (a smaller rig) that is purpose-built for completions will be moved on to the well to get the well on line.

Mining drilling rigs are used for two main purposes, exploration drilling which aims to identify the location and quality of a mineral, and production drilling, used in the production-cycle for mining. Drilling rigs used for rock blasting for surface mines vary in size dependent on the size of the hole desired, and is typically classified into smaller pre-split and larger production holes. Underground mining (hard rock) uses a variety of drill rigs dependent on the desired purpose, such as production, bolting, cabling, and tunnelling.

In early oil exploration, drilling rigs were semi-permanent in nature and the derricks were often built on site and left in place after the completion of the well. In more recent times drilling rigs are expensive custom-built machines that can be moved from well to well. Some light duty drilling rigs are like a mobile crane and are more usually used to drill water wells. Larger land rigs must be broken apart into sections and loads to move to a new place, a process which can often take weeks.

Small mobile drilling rigs are also used to drill or bore piles. Rigs can range from 100 short tons (91,000 kg) continuous flight auger (CFA) rigs to small air powered rigs used to drill holes in quarries, etc. These rigs use the same technology and equipment as the oil drilling rigs, just on a smaller scale.

An automated drill rig (ADR) is an automated full-sized walking land-based drill rig that drills long lateral sections in horizontal wells for the oil and gas industry.Athabasca oil sands. According to the "Oil Patch Daily News", "Each rig will generate 50,000 man-hours of work during the construction phase and upon completion, each operating rig will directly and indirectly employ more than 100 workers." Compared to conventional drilling rigs", Ensign, an international oilfield services contractor based in Calgary, Alberta, that makes ADRs claims that they are "safer to operate, have "enhanced controls intelligence," "reduced environmental footprint, quick mobility and advanced communications between field and office."steam assisted gravity drainage (SAGD) applications was mobilized by Deer Creek Energy Limited, a Calgary-based oilsands company.

Baars, D.L.; Watney, W.L.; Steeples, D.W.; Brostuen, E.A (1989). Petroleum; a primer for Kansas (Educational Series, no. 7 ed.). Kansas Geological Survey. p. 40. Archived from the original on 8 November 2020. Retrieved 18 April 2011. After the cementing of the casing has been completed, the drilling rig, equipment, and materials are removed from the drill site. A smaller rig, known as a workover rig or completion rig, is moved over the well bore. The smaller rig is used for the remaining completion operations.

"Ensign Launches Newest And Most Powerful Automated ADR 1500S Pad Drill Rigs In Montney Play", New Tech Magazine, Calgary, Alberta, 21 November 2014, archived from the original on 10 December 2014, retrieved 6 December 2014

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.

The HWO unit uses hydraulic cylinders to lift tubulars in or out of the well. Using hydraulic cylinders allows for perfect control over tubular movements and eliminates the use of a large mast construction which is present on conventional drilling rigs.

Hydraulic cylinders can generate large pull and push forces and provide the HWO unit with a small footprint and configuration. These properties are beneficial for offshore operations where space can be limited and where harsh weather conditions are present. In general, the running speed of a HWO unit is lower than a conventional workover rig.

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Pulling units -- otherwise known as workover rigs -- are used in the oil industry when a well needs to be replaced with a fresh completion. These rigs are massive in size and come in several varieties, but you can have an easy time shopping for one by keeping these tips in mind.

If you don"t have a lot of financial resources to put towards a pulling unit, then it"s probably best to buy used. This will be a much more cost-effective investment and it opens up your oil operations to future investments. You"ll just need to carefully examine used pulling units in person.

It"s also recommended to take a professional with you on these inspections so that you have an experienced set of eyes helping you assess relevant components. With patience and thoroughness, you can buy a used pulling unit that"s in great condition and works perfectly.

If your oilfield site has multiple wells and you plan on using the pulling unit in different areas, then it"s so important to get one that"s mounted to a truck. You then won"t have to struggle to transport it to different sites.

The truck that the pulling unit is attached to can simply navigate to another area quickly and safely. You"ll just need to be careful during transportation, making sure there are no obstructions or workers blocking your path. It"s important to keep in mind that pulling units mounted to trucks will cost more because of the additional components.

There are a lot of suppliers that offer pulling units today for oil-related operations. However, you want to be strategic with which person you buy from because, although most sellers are reputable, not all suppliers may sell high-quality workover rigs.

So that you have complete confidence in the supplier you buy from, look into their credibility. How long has the supplier been in this industry and what"s their reputation? You can find these answers online quickly. Also, assess the supplier"s credentials. If they"re licensed to sell these pulling units and have been in the industry for a long time, that bodes well for your investment.

Pulling units are incredibly important systems for oilfield sites today. If you"re about to purchase one of these units, take your time with this investment. Look into the available options and weigh the right details so that after you make a selection, you have no regrets.

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