Master Distributors of Oil Tools World Petroleum Supply, Inc.
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National Oilwell Varco Shaffer® record of reliability in pressure control equipment is the result of continual research and development, advanced manufacturing techniques, stringent quality control and steady follow-through on after-the-sale training, service and parts. This reliability is available in ram, annular and rotating blowout preventers and in choke and kill manifold gate valves. Each pressure control product has features to increase the efficiency of your drilling or workover operations. A Ram BOP is a safety unit used during the drilling or workover operation to control well bore fluid pressure. The BOP achieves wellbore pressure control by closing rams to seal around drilling tubulars and open hole, or to shear and seal drilling tubulars under various drilling conditions. Under normal drilling the BOP experiences little or no internal pressure. However, if while drilling, a high-pressure oil or gas pocket is encountered in the well, the BOP rams can be closed to prevent the high-pressure returning well fluid (whose pressure is greater than the weight of the drilling mud) from blowing out of the well.
| Bore (in.)/Working Pressure (psi) | LWS | LXT | NXT | SL | SLX |
|---|---|---|---|---|---|
| 4-1/16-5,000 | X | ||||
| 4-1/16-10,000 | X | ||||
| 7-1/16-3,000 | X | X | |||
| 7-1/16-5,000 | X | X | |||
| 7-1/16-10,000 | X | X | |||
| 7-1/16-15,000 | X | X | |||
| 9-3,000 | X | ||||
| 9-5,000 | X | ||||
| 11-3,000 | X | X | |||
| 11-5,000 | X | X | |||
| 11-10,000 | X | X | |||
| 11-15,000 | X | ||||
| 13-5/8-3,000 | X | X | |||
| 13-5/8-5,000 | X | X | |||
| 13-5/8-10,000 | X | X | |||
| 13-5/8-15,000 | X | ||||
| 16-3/4-3,000 | |||||
| 16-3/4-5,000 | X | ||||
| 16-3/4-10,000 | X | ||||
| 18-3/4-5,000 | X | X | |||
| 18-3/4-10,000 | X | X | |||
| 18-3/4-15,000 | X | X | |||
| 20-3/4-3,000 | X | ||||
| 21-1/4-2,000 | X | ||||
| 21-1/4-5,000 | X | ||||
| 21-1/4-10,000 | X |
National Oilwell Varco continues to develop solutions to enhance and increase productive drilling time. Among these solutions are an extensive Ram product line and advanced Ram locking system options.
The Annular BOP is a different type of safety unit used to control wellbore fluids. This type of BOP consists of a large rubber sealing element which is mechanically squeezed inward to seal on tubulars or the open hole. The ability to seal on a variety of pipe sizes is one advantage the annular blowout preventer has over ram-type blowout preventers.
Shaffer Spherical BOPs seal onto almost any shape or size of kellys, tool joints, drill pipe, drill collar, casing, and wireline, in addition to closing on an open hole. This capability permits stripping of drill pipe under well pressure. The Shaffer element can provide up to five times more life than the sealing elements of conventional Annulars. It closes upward and inward in a smooth spherical motion, rather than horizontally only. Internal stresses are reduced, as is the friction between the sealing element and the BOP body.
Shaffer Spherical BOPs are manufactured In two versions - the Wedge cover model, and the Bolted-cover model. The Wedge cover models are, in general, the larger Sphericals and can operate under high working pressures.
National Oilwell Varco offers unmatched experience in BOP Control Systems as the only supplier of original Koomey® products. The product line includes conventional Minuteman and Multiplex systems for all surface and subsea drilling applications.
National Oilwell Varco offers a complete range of Marine Riser Systems that consistently provide the performance and rugged durability required for all depths of drilling application.
National Oilwell Varco manufactures Riser Support Systems, Riser Tensioners, and Rucker™'" Motion Compensation Systems offering field proven support and stability necessary for your successful drilling operations.
Shaffer Gate Valves meet the requirements for choke and kill manifold service in adverse field conditions, land or offshore, and give you choices in manual or remote operation as well as bore sizes and working pressures.
Shaffer Choke and Kill Manifolds can be manufactured to your specifications, from simple low pressure to high pressure applications.
National Oilwell Varco's Shaffer Spherical BOP is one of the first lines of defense in controlling a well. When actuated, hydraulic pressure operates the piston, and in turn closes the spherical. The Spherical's closure occurs in a smooth, simultaneous upward and inward motion, as opposed to horizontal motion..
FEATURES:.
Shaffer® Spherical blowout preventers are compact, annular type BOPs that seal reliably on almost any shape or size kelly, drill pipe, tool joint, drill collar, casing or wireline. Sphericals also provide positive pressure control for stripping drill pipe into and out of the hole. They are available in bolted cover, wedge cover, dual wedge cover and NXT models that contain each of the following special features:
The success of NOV's Shaffer Sphericals is due primarily to the ruggedness and reliability of their sealing element. Hundreds of pressure tests to full working pressure have proven its ability to maintain a positive seal. Tests performed in an industry program sponsored by 22 companies including three major BOP manufacturers, proved the Shaffer Spherical element lasts two to four times longer than elements in other annular preventers. The element retains its ability to return to the opened position longer than other sealing packers do. The long sealing life of the element gives Shaffer Sphericals a high degree of reliability and keeps maintenance costs, as well as operating costs, to a minimum. Stripping operations are undoubtedly the most severe application for any preventer because of the wear the sealing element is exposed to as the drill string is moved through the preventer under pressure. To prolong sealing element life, it is important to use proper operating procedures when stripping. The recommended procedures are:
Stripping is smooth with a Shaffer Spherical because the element opens and closes so easily. The steel segments molded into the rubber make metal-to-metal sliding contact with the sphere of the housing. This provides a much lower coefficient of friction than rubber-to-metal contact. Well pressure assists will not cause it to oversea!, since the element's design and method of energization counteract the well bore pressure acting on the piston. During stripping out, well pressure and pipe movements are in the same direction. Rubber compresses firmly against the steel segments at the top of the element, but rubber at the bottom is only lightly compressed. This creates a "funnel effect" that makes it easy for a tool joint to enter the sealing element. Hydraulic pressure bleeds off, allowing the element to expand and accommodate the larger O.D. of the tool joint.
When stripping in, well pressure and pipe movement oppose each other. Well pressure compresses the rubber portion of the element against the steel segments as the tool joint moves down into the Spherical.
Sealing elements are available in natural and Nitrile rubber compounds. This allows the Spherical to be fitted for any type of service water base mud, oil base mud, and low temperature. Natural rubber offers excellent fatigue and wear life in water base muds, and operates well in lower temperatures. This allows the Spherical to be fitted for any type of service; water base mud, oil base mud, and low temperature.
With the single and dual snubbing BOPs operation, time is reduced by eliminating conventional ram-to-ram snubbing. Both single and dual snubber blowout preventers have a working pressure of 5,000 and 10,000 psi. And just like the Spherical BOPs, the snubbers utilize the Shaffer 10,000 psi spherical packing element with its field proven design. This explains why there is a long life under the harsh snubbing conditions of passing tool joints and couplings through the element.
In these single and dual snubbers, maintenance is also made faster and easier. The two-piece snubbing element enables easy replacement with pipe in the well. For more assistance in rapid removal of the element, there is a hydraulically operated quick-release bonnet and an easy lift upper housing. The easy-lift upper housing further assists in rapid snubbing element removal with hydraulic cylinders integral to the BOP housing. In all, only eight minutes are needed to replace a snubbing element.
After years of limited changes in the development of BOP design, National Oilwell Varco's line of Shaffer'" NXT BOP Systems offers the drilling industry improved drilling economics in a new generation of well control systems. This new generation BOP has changed the performance expectations for pressure control equipment, offering significant operational advantages and features.
The NXT includes XT'" "Boltless Doors" and a "No-Weld Cavity". Single, double and triple cavity models are available for working pressures of 5,000, 10,000 and 15,000 psi. The double and triple models save space and weight by combining two or three ram compartments into one unitized body. Lock options include Poslock®, Ultralock'", and ManualLock systems. NXT BOPs are manufactured in accordance with API Specification 16A, Third Edition, June 2004 and NACE MR0175 per API Specification 16A, Temperature T20
NOV's Shaffer NXT BOP offers a number of benefits and has significantly improved safety and efficiency, with quick access using boltless doors.
National Oilwell Varco Shaffer® BOP Systems are unique in highlighting a means of significantly improving safety and efficiency in the critical path of activity. With the replacement of the large door bolts in ram BOPs Shaffer has eliminated the manual practice of using brute force to torque up a series of large bolts. With the elimination of the large doors bolts in these ram BOPs, Shaffer'" has eliminated the time-consuming practice of using hydraulic tools to manually torque-up multiple door bolts. There are a number of benefits with this development.
The NXT "Boltless Door" assembly is mechanized using hydraulics to lock, unlock, open and close the door. The lock and unlock process is done with hydraulic cylinders mounted on the doors used to engage and disengage a locking bar system. These load bearing lock bars, housed in the door grooves, lock the door and body together.
Hydraulic power to operate a Model NXT ram BOP can be furnished by any standard oil field accumulator system. Hydraulic passages drilled through the body eliminate the need for external manifold pipes between the hinges. Each set of rams requires only one opening and one closing line. There are two opening and two closing hydraulic ports, clearly marked, on the back side of the BOP. The extra hydraulic ports facilitate the connection of the control system to the preventer.
A standard hydraulic accumulator unit will close any model NXT ram with rated working pressure in the well bore.
The Introduction of the NXT® Ram BOP was initially in the 18-¾”, 15,000 psi size. This system was designed to enable a stack height and weight package similar to a 13-5/8” BOP configuration and provide the capability of eliminating the dual stack drilling system with a through bore wellhead connector. Actuation of the boltless door mechanism is available in two configurations:
Shaffer's no-weld cavity feature, introduced in the SLX model ram blowout preventer, is standard on the NXT ram blowout preventer. This no-weld cavity feature allows upgrade of the BOP to "as new" condition by introducing replaceable parts to the cavity. Post-weld heat treatments and extensive in-shop repairs are thus eliminated. The noweld cavity has a replaceable seal seat, a replaceable skid plate and replaceable side pads.
The Ultralock II locking system incorporates a mechanical locking mechanism within the piston assembly. This locking system is not dependant on closing pressure to maintain a positive lock. It uses flat tapered locking segments carried by the operating piston which engages another stationary tapered shaft located within the operating cylinder.
The system needs no adjustments, no matter the size of the pipe rams. Different size or type ram assemblies can be freely interchanged.
Only one hydraulic function is required to operate the cylinders open/close function and the locking system. The system automatically locks in the closed position each time the piston assembly is closed. Once the operating piston is closed on the pipe, the locks are engaged until opening pressure is applied. Only hydraulic pressure can unlock and reopen the preventer.
NXT preventers equipped with Poslock pistons are locked automatically in the closed position each time they are closed. The preventers will remain locked in the closed position even if closing pressure is removed. Open hydraulic pressure is required to reopen the pistons. The hydraulics required to operate the Poslock are provided through opening and closing operating ports. Operation of the Poslock requires no additional hydraulic functions, such as are required in some competitive ram locking systems.
Manual-lock pistons move inward and close the rams when closing, hydraulic pressure is applied. If desired, the rams can be manually locked in the closed position by turning each locking shaft to the right until it shoulders against the cylinder head. Should hydraulic pressure fail, the rams can be manually closed and locked. They cannot be manually reopened.
Manually locking shafts are visible from outside, and provide a convenient ram position indicator. Threads on the manual locking shaft are enclosed in the hydraulic fluid and are not exposed to corrosion from mud and salt water or to freezing.
Manually locking shafts are visible from outside, and provide a convenient ram position indicator. Threads on the manual locking shaft are enclosed in the hydraulic fluid and are not exposed to corrosion from mud and salt water or to freezing. See RAM BOP Lock Option Section.
Note that rams are priced separately from the BOP, and the customer is asked to specify the ram sizes to be installed in the cavities at the time of order placement.
Three styles of shear booster operators are available. The standard NXT body is available with the Super Booster with a Poslock'" system aided by two tandem boost pistons. This produces the force required to shear today's high CHARPY drill pipe. The 14" x 14" (35.6 mm x 35.6 mm) compact shear booster design incorporates a Poslock system with a single 14" diameter boost piston. The 14" x 14" compact design is also capable of shearing today's high CHARPY drill pipe with 3,000 psi operating pressure. The preferred-offering extended NXT body incorporates a 22" shear operator with a 5,000 psi working pressure (see figures) and Poslock® system. This operator is designed to shear the latest offering of 5"Va" high CHARPY drill pipe, large diameter casing, and the future offerings of larger diameter (6"Va") high CHARPY drill pipe without a booster. While capable of operating with a 3,000 psi hydraulic supply, the 22" operator reaches full capability when a 5,000 psi hydraulic system is used as its supply. A 3,000 psi hydraulic system provides similar shear force to that of the Super and Compact booster operators.
Hydraulic door functions are operated through a control manifold assembly. The assembly is mounted to a plate for convenient customer installation.
The lower BOP ram cavity may be ordered "inverted" to seal on pressure above the ram assembly. This optional configuration of the ram cavity permits surface pressure testing of the BOP without the need to trip a test plug. Note: The test cavity is not bidirectional; that is, it does not seal with pressure below the rams.
The Automated Ram Changing System (ARC®) has the potential to dramatically reduce, and possibly eliminate, lost time incidents by removing all hands-on activity involved in changing rams. Manpower may be reduced by 50% allowing for ram changing activities to be performed by a crew of 1-2 instead of the 4-5 conventionally required. Safety of rig personnel and cost savings realized are just some of the benefits of using the ARC®.
A ram-changing arm quickly and accurately retrieves and replaces rams in minutes, from a simple removable storage magazine.
The Shaffer® hydraulic operated Model LXT™ ram blowout preventer (LXT BOP) with manual locking cylinders provides a rugged, reliable preventer that is easily serviced in the field (see Figure 2-1).
Special features include:
The manual lock LXT BOP is available in single and double models. Contact World Petroleum Supply Sales for special configurations. This manual provides the installation, operation, and maintenance procedures for standard manual lock LXT BOP models with manual lock operators. The manual lock operators are used to close the ram assemblies on the drill pipe and close off the well bore. The manual lock operators require a hydraulic closing pressure of 1,500 psi (103 bar) to accomplish sealing the well bore pressure to the rated working pressure of the preventer. Maximum working pressure for the cylinders is 3,000 psi (206 bar). When the rams are hydraulically closed, the manual lock acme thread locking bolts are rotated clockwise to manually lock the rams in the closed position. National Oilwell Varco (NOV) supplies manual lock LXT BOPs in the sizes shown in the table titled "LXT BOP Available Sizes and Working Pressures" below.
LXT BOP Available Sizes and Working Pressures
Working Pressure Size
- 5,000 psi (345 bar) 7-1/16” (180 mm)
- 3,000 psi (207 bar) 7-1/16" (180 mm)
The Shaffer® RAM LXT BOPs available at World Petroleum Supply, Inc are designed for drilling and workover service. They are hydraulically operated and can be manually locked by turning a handle or handwheel (optional). The standard trim unit is suitable for internal H2S environments. Units can be manufactured for Arctic to -75 ºF (-59 ºC) and full H2S environmental services. Standard units can be retrofitted for full environmental H2S service. NOV preventers are manufactured in accordance with the American Petroleum Institute (API) specification 16A and the National Association of Corrosion Engineers (NACE) document NACE Standard MR 0175 (current revision).
The Shaffer® Manual Lock Model SL Ram Blowout Preventer (SL BOP) provides a rugged, reliable preventer that is easily serviced in the field.
Special features include:
The Manual Lock SL BOP is available in single, double, and triple models. This manual provides the installation, operation, and maintenance procedures for all Manual Lock SL BOP models.
| Working Pressure | Size | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| psi | bar | in | mm | ||||||||||
| 15,000 | 1,035 |
|
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| 10,000 | 690 |
|
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| 5,000 | 345 |
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| 3,000 | 207 |
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These high-pressure, heavy-duty BOPs are designed for drilling and workover service. They are hydraulically operated and can be manually locked by rotating the handwheels. Units can be manufactured for Arctic (to −75°F). Shaffer preventers are manufactured in accordance with the American Petroleum Institute (API) specification API Spec. 6A (current edition) and the National Association of Corrosion Engineers (NACE) document “NACE Standard MR-01-75” (current revision).
Hydraulic operating fluid can be supplied by an NOV Koomey® or other BOP Closing System. 1,500 psi (103 bar) hydraulic pressure will close any model SL ram BOP with rated working pressure in the wellbore, except for the 11″ (279.4 mm) and 13-5/8″ (346.1 mm) 15,000 psi (1,034 bar) BOPs, which require 2,200 psi (152 bar). The 11″ (279.4 mm) and 13-5/8″ (346.1 mm) will close against 10,000 psi (690 bar) well pressure with less than 1,500 psi (103 bar) hydraulic pressure. However, to hold 15,000 psi (1,034 bar) wellbore pressure requires 2,200 psi (152 bar) hydraulic closing pressure. At the operator’s discretion, 3,000 psi (207 bar) closing hydraulic pressure may be used on all SL model preventers.
These high-pressure, heavy-duty BOPs are designed for drilling and workover service. They are hydraulically operated and can be manually locked by rotating the handwheels. Units can be manufactured for Arctic (to −75°F). Shaffer preventers are manufactured in accordance with the American Petroleum Institute (API) specification API Spec. 6A (current edition) and the National Association of Corrosion Engineers (NACE) document “NACE Standard MR-01-75” (current revision).
Hydraulic operating fluid can be supplied by an NOV Koomey® or other BOP Closing System. 1,500 psi (103 bar) hydraulic pressure will close any model SL ram BOP with rated working pressure in the wellbore, except for the 11″ (279.4 mm) and 13-5/8″ (346.1 mm) 15,000 psi (1,034 bar) BOPs, which require 2,200 psi (152 bar). The 11″ (279.4 mm) and 13-5/8″ (346.1 mm) will close against 10,000 psi (690 bar) well pressure with less than 1,500 psi (103 bar) hydraulic pressure. However, to hold 15,000 psi (1,034 bar) wellbore pressure requires p=2,200 psi (152 bar) hydraulic closing pressure. At the operator’s discretion, 3,000 psi (207 bar) closing hydraulic pressure may be used on all SL model preventers.
The National Oilwell Varco manual lock Model SLX ram blowout preventer provides a rugged, reliable preventer that is easily serviced in the field. Special features include:
The manual lock SLX BOP is available in single and double models. (Contact World Petroleum Supply Sales for special configurations.) This manual provides the installation, operation, and maintenance procedures for the SLX BOP model with 15.25” manual locking cylinders. See Figure 2-1 on Page 2-2
These BOPs are designed for drilling and workover service. They are hydraulically operated and can be manually locked by turning handwheels. The standard trim unit is suitable for internal H2S environments. Units can be manufactured for Arctic (to -75° F or -59° C) and full H2S environmental services. Standard units can be retrofitted for full environmental H2S service. Shaffer preventers are manufactured in accordance with the American Petroleum Institute (API) specification 16A (third edition) and the National Association of Corrosion Engineers (NACE) document NACE Standard MR 01 75. Hydraulic pressure of 1,500 psi (103 bar) will close any model SLX ram BOP with its rated wellbore pressure or less. Maximum of 3,000 psi (207 bar) can be used. The specifications and dimensions given are for the 13 5/8” 10,000 psi manual lock SLX. The Shaffer model SLX ram BOP can be supplied with booster cylinders if required. See Figure 2-1 on Page 2-2.
Exposure to the daily hazards of drilling can lead rig crews and service personnel to disregard or overlook hidden hazards. The safety precautions listed below should be observed at all times.
Turn off the system power and bleed all pressure prior to making any repairs or adjustments that do not require system power.
Hydraulic lines carrying fluids at high pressures can inflict potentially fatal injuries if the pressure escapes. Protect hydraulic lines from cutting, scraping, pinching, or other physical damage. Always wear hard hats and safety glasses when working around hydraulic lines. Bleed the pressure from any hydraulic line prior to disconnecting any fittings. Respect the prescribed ASME code minimum bend radius for hydraulic lines. Bending around too short a radius can rupture the line.
Do not weld or operate acetylene-cutting torches near unprotected electrical cable, flexible hose, or hose bundles. Weld spatter can seriously damage the hose or cable. Ensure no slag or spatter enters the hydraulic system.
Many of the BOP components, though apparently similar to commercial hardware, are manufactured to system design specifications. To avoid possible hazardous failures, use only exact replacement parts or assemblies. Contact World Petroleum Supply for details.
The Shaffer manual lock Model LWS ram blowout preventer (LWS BOP) available at World Petroleum Supply, Inc. with two Texas locations. provides a rugged, reliable preventer that is easily serviced in the field. Special features include:
The manual lock LWS BOP is available in single and double models. Contact World Petroleum Supply, Inc. Sales for special configurations. Shaffer supplies manual lock LWS BOPs in the sizes shown in the table titled "LWS BOP Available Sizes and Working Pressures" below. These BOPs are designed for drilling and workover service. They are hydraulically operated and can be manually locked by turning handwheels. The standard trim unit is LWS BOP.
LWS Ram Blowout Preventers are suitable for internal H2S environments. Units can be manufactured for Arctic (to -75 ºF or -59 ºC) and full H2S environmental services. Standard units can be retrofitted for full environmental H2S service. Shaffer preventers are manufactured in accordance with the American Petroleum Institute (API) specification 6A (current edition) and the National Association of Corrosion Engineers (NACE) document NACE Standard MR 01 75". Shaffer preventers can also be manufactured in accordance with the API specification 16A.
Hydraulic pressure of 1,500 psi (103 bar) will close any model LWS ram BOP with its rated wellbore pressure of 10,000 psi (690 bar) or less.
The specifications and dimensions given are for manual lock LWS BOPs.
Safety Precautions
Exposure to the daily hazards of drilling can lead rig crews and service personnel to disregard or overlook hidden hazards. The safety precautions listed below should be observed at all times.
Equipment Repairs or Adjustments
Turn off the system power and bleed all pressure prior to making any repairs or adjustments that do not require system power.
Hydraulic Lines
Hydraulic lines carrying fluids at high pressures can inflict potentially fatal injuries if the pressure escapes. Protect hydraulic lines from cutting, scraping, pinching, or other physical damage. Always wear hard hats and safety glasses when working around hydraulic lines. Bleed the pressure from any hydraulic line prior to disconnecting any fittings. Respect the prescribed ASME code minimum bend radius for hydraulic lines. Bending around too short a radius can rupture the line.
Welding and Cutting
Do not weld or operate acetylene-cutting torches near unprotected electrical cable, flexible hose, or hose bundles. Weld spatter can seriously damage the hose or cable. Ensure no slag or spatter enters the hydraulic system.
Replacement Parts
Many of the BOP components, though apparently similar to commercial hardware, are manufactured to system design specifications. To avoid possible hazardous failures, use only exact replacement parts or assemblies ...Contact World Petroleum Supply for details on BOP best suited for your job.
