In this article, subsurface safety valve types, operating systems, working principle, setting depth, and selection process are presented. These safety valves are controlled via the surface wellhead control panels and in an emergency, the emergency shutdown panels assume the control function. It covers subsurface safety valves including all components that establish tolerances andor clearances which may affect performance or interchangeability of the. Subsurface controlled subsurface safety valves sscsv those valves which are installed beneath the surface are called sscsv. Halliburton offers a full line of highly reliable and fieldproven tubingretrievable and wirelineretrievable safety valves, including both surfacecontrolled and. Since 1990, over 30,000 halliburton safety valves have been sold. Review surface controlled subsurface safety valves. The full designation for a typical valve is tubing retrievable, surface controlled, subsurface safety valve, abbreviated to trscssv. Pdf comparison of characteristic of antiscaling coating.
Subsurface safety valve archives production technology. Operators are completing wells in increasingly challenging environments where equipment are subject to extreme pressures, temperatures, and mechanical loading. We offer a full range of valves to suit applications ranging from shallow to deepset, and the. It also reduces the potential for environmental discharge or damage to production equipment resulting from an. Subsurface safety valve equipment sssv subsurface safety valve equipment sssv qualification testing of subsurface safety valve equipment to api 14a. Iso 10417 petroleum and natural gas industries subsurface safety valve systems design, installation, operation and redress.
This application is a continuation division, of application no. An australian operator experienced failed downhole safety valves dhsv in two of their biggest producing wells, compromising well integrity. Tagged 14 control line, 14 inch stainless steel control line, and operation of subsurface safety valve systems, api rp 14b, ball type scssv, concept 2 completion pte ltd, differential type subsurface controlled subsurface safety valve, flapper type scssv, installation, recommended practice for design, scssv, scssv setting depth, sscsv, sssv. Subsurface safety valves sssv operations completion. The majority of installations of subsurface safety valves is in offshore wells, although they also are being used in onshore areas where sabotage of the wellhead is even a remote possibility. For example, such safety valves, or storm chokes as they are often referred to, are used in offshore wells to prevent. Subsurface safety valve otis engineering corporation. Comply with the following testing requirements for subsurface safety devices on dry tree wells. Discuss work done to improve our valves and eliminate troubles. Pressure transducers covering a 0 to 30,000 psig range are available to monitor the hydraulic control line pressure on surfacecontrolled subsurface safety valves and valve bore pressure.
Wrdp2 slicklineretrievable subsurface safety valves are designed for sweet to moderately corrosive environments and feature rodpiston operation with flapper valves and an internal equalizing system that can be disabled by plugging the equalization ports before installation. Our wirelineretrievable safety valves wrsvs provide economical solutions to repair damaged safety valves. Design, installation, repair and operation of subsurface safety valve systems ansiapi recommended practice 14b fifth edition, october 2005 iso 10417. Comparison of characteristic of antiscaling coating. The importance of the correct installation of these valves to ensure well production flow is shut in during an emergency can not be over emphasised. Wrdp1 slicklineretrievable subsurface safety valves. Recommended practice for design, installation, and operation of subsurface safety valve systems. Superior completion services flowsafe tubingretrievable. Subsurface safety systems baker hughes, a ge company. Subsurface safety equipment 10 101 subsurface safety equipment introduction halliburton subsurface safety systems can be used as total systems or subsystems in an overall safety installation. In installing the safety valve, it is connected into the tubing string, as by coupling 19, with a tubing anchor 21, or a set of casing slips, provided at the lower end of the valve and a set of hydraulic holddown slips 22 near the upper end of the valve to secure the valve 11 at the desired subsurface location in casing 23.
We offer a full line of tubingretrievable and wirelineretrievable subsurface safety valves, including both surfacecontrolled and directcontrolled. The mms is incorporating by reference the eleventh edition of the american petroleum institutes specification for subsurface safety valve equipment api spec 14a into its regulations. Specification for subsurface safety valve equipment. A subsurface safety valve sssv is a device which automatically pow. G14b06 this document establishes requirements and provides guidelines for subsurface safety valve sssv system equipment. Pdf knowing subsurface safety valve api14a charlie chong. Pdf the challenges in well construction have been increasing over time, sometimes by increasing the technical difficulties. Api spec 14a specification for subsurface safety valve equipment, twelfth edition, includes errata july, 2015 standard by american petroleum institute, 01012015 amendments available. Qualification testing of subsurface safety valve equipment to api 14a the industry challenge operators are completing wells in increasingly challenging environments where equipment are subject to extreme pressures, temperatures, and mechanical loading. Cameron safety systems guard against loss of life and environmental and equipment damage.
Charlie chong fion zhang subsurface safety valve sssv charlie chong. There is disclosed a subsurface tubing safety valve having a normally closed flapper which is adapted to be moved to open position by a flow tube reciprocable within the body of the valve. Us20030079880a1 curved flapper and seat for a subsurface. The location of the downhole safety valve within the completion is a precisely determined parameter intended to optimise safety. Safety valve trsv is a flappertype, equalizing or nonequalizing, surfacecontrolled subsurface. Api specification 14a subsurface safety valve equipment. Wrdp2 slicklineretrievable subsurface safety valves scssv. The project examined the leakage rates for surface safety valves ssv, underwater safety valves usv, and subsurface safety valves sssv and the reliability of certified sppe versus noncertified sppe. This international standard has been developed by userspurchasers and suppliersmanufacturers of subsurface safety valve sssv equipment intended for use in the petroleum and natural gas industry worldwide. Discuss troubles we experienced in iran with our first installations. A separate database is established and maintained by sintef on surface controlled subsurface safety valves scssv. Retrofitting third party replacement valves without the. Feb 04, 1997 a subsurface safety valve of claim 1 wherein the opening is substantially parallel with and adjacent a piston and cylinder assembly within the valve housing.
The facilities are also used to perform safety valve testing on other downhole safety valves. In each case, the safety valve system is designed to be failsafe, so that the wellbore is isolated in the event of any system failure or damage to the surface productioncontrol facilities. Deployed on slickline, a wrsv can land inside a failed tubingretrievable safety valve trsv, which effectively bypasses the trsv to restore production at a fraction of the cost of replacement. Various types of subsurface safety valves have been employed to stop the flow of fluids produced from a well when for some reason the flow of produced fluids cannot be controlled. The actuated gate valve is on the upstream end, and the access tee on the downstream end with the chokecontrol valve between these two components. Deepshield deepwater tubingretrievable subsurface safety valve. Type of sssv control surfacecontrolled, subsurfacecontrolled b. Our portfolio of subsurface safety valves deliver reliable performance when it matters the most, providing emergency closure in the event that well control is lost. Deepshield deepwater tubingretrievable subsurface safety. The mms is incorporating the eleventh edition of api spec 14a because it updated the design validation and. Knowing subsurface safety valve api14 a linkedin slideshare. Pdf knowing subsurface safety valve api14a charlie.
Each well consisting out of a surface controlled subsurface safety valve scssv and surface safety valve ssv. And since 2000, we have delivered, on average, over five safety valves each day to operators around the globe. Subsurface safety valve equipment sssv cfer technologies. Give a brief history of the development of subsurface safety valves. This paper describes selfequalizing scssvs, discusses th. Development of a selfequalizing surface controlled. Federal register requirements for subsurface safety valve. Api 14a subsurface safety valve test application download pdf.
The flapper is biased to a normally closed position to prevent fluid flow through the wellbore. This specification provides the requirements for subsurface safety valves sssvs, and the secondary tools as defined herein necessary to operate the features included within them, including all components that. Per this specification, subsurface safety valves must now undergo more stringent prototype testing than was previously required. Petroleum and natural gas industries subsurface safety valve systems design, installation.
All controls on a config2 are completely mounted, tubed and tested. Safety valve is a flappertype, equalizing or nonequalizing, surfacecontrolled subsurface safety valve scssv. Development of a selfequalizing surface controlled subsurface safety valve for reliability and design simplification authors thomas g. Pdf reliability study of subsurface safety valve control system in. The deepshield valve is the industrys first v1validated subsurface safety valve as defined in api spec 14a specification for subsurface safety valve equipment, twelfth edition. The safety valve system is designed to be fail safe, so that. A curved flapper and seat is disclosed for use in a subsurface safety valve.
A downhole safety valve that is operated from surface facilities through a control line strapped to the external surface of the production tubing. Section 7 subsurface safety superior energy services. Concept 2 completion pte ltd, safety valves catalogue. Petroleum and natural gas industries subsurface safety valve systems design, installation, operation and redress. Pdf risk assessment and reduction for an innovative. It also reduces the potential for environmental discharge or damage to.
Wrdp1 slicklineretrievable subsurface safety valves are designed for sweet to moderately corrosive environments and feature rodpiston operation with flapper valves and an internal equalizing system that can be disabled by plugging the equalization ports before installation. Design, installation, repair and operation of subsurface. A downhole safety valve refers to a component on an oil and gas well, which acts as a failsafe. The sealing surface of the flapper is configured to contact the sealing surface. Scssv setting depth archives production technology. Surface controlled subsurface safety valves sssv act model safety valves are installed in the upper wellbore to provide emergency closure of the producing conduits in the event of an emergency. Valves common types pressure relief valves obviously as the name suggests pressure relief valves are a safety device designed to open when system pressure ie in a vessel or pipework becomes too great and may damage equipment or endanger personnel if not relieved. Jul 30, 2018 subsurface safety systems table of contents product number index prod.
This specification provides the requirements for subsurface safety valves sssvs, and the secondary tools as defined herein necessary to operate the features included within them, including all components that establish tolerances andor clearances that may affect performance or interchangeability of the sssv components. Pdf specification for subsurface safety valve equipment. Accordingly, qualitative techniques associated with the monitoring, testing and checking. Subsurface safety valve basics production technology. Torus insert safety valve baker hughes, a ge company. The curved flapper has a sealing surface for engaging a corresponding sealing surface on a seat when the flapper is in its closed position. Dec 10, 2017 they are classified according to the location from which they are controlled surface or subsurface. The project also tested two subsurface controlled sssv to see how closely they operated to their designed performance.
Oct 09, 2010 contents abstract objective methodology introduction history of the safety valve safety valve operation types of subsurface safety valve list of components conclusions bibliography 5. Well integrity management is a key activity to prevent hydrocarbon leakages during the oil well life cycle. This invention relates generally to subsurface safety valves for controlling flow within a well string suspended within a well bore. A subsurface safety valve has a tubular valve housing, a valve closure member movable between an open and a closed position, an axially shiftable flow tube for opening the valve closure member, a spring for biasing the flow tube to a closed position, a piston and cylinder assembly to move the flow tube to an open position, and a plug inserted within an opening in the valve. Feb 22, 20 surface controlled subsurface safety valve. Subsurface safety valve catalog superior energy services. Wrdp2 slicklineretrievable subsurface safety valves. Describes the requirements for subsurface safety valves sssvs, and the secondary tools as defined herein necessary to operate the features included within them, including all components that establish tolerances andor clearances that may affect performance or interchangeability of the sssv components. The whps system as shown has been designed to operate gas production wells. The flow tube is urged to flapper opening position by hydraulic fluid from a remote source and is urged to a position permitting the flapper to close by a curved beam type spring. Comparison of characteristic of antiscaling coating for subsurface safety valve for use in oil and gas industry.
Subsurface safety valve the api defines a subsurface safety valve as a device whose design function is to prevent uncontrolled well flow when closed. With a 97% plus reliability rate and proficiency in subsurface design, we design our subsurface safety valves to meet your well requirements. Discuss development of a valve for use in gas wells, including test work in oklahoma. Abstract surface controlled subsurface safety valves scssvs are normally closed devices that provide control of wellbore fluids, and wc required in virtually all offshore wells world wide. Knowing subsurface safety valve sssv a subsurface safety valve is essentially a shutdown valve installed at the upper wellbore for emergency shutdown to protect the production tubing and wellhead in case of overpressure. It covers subsurface safety valves including all components that establish tolerances andor clearances which may affect performance or interchangeability of the sssvs. Torus insert safety valve enable safe production enhancement without a rig in applications where you need to run an apiqualified safety barrier above your espand want to maintain all the benefits of a totally rigless operationthe torus insert safety valve is the answer to your dilemma. Pressure level for the surface controlled subsurface safety valves scssv. Subsurface safety valves sssvs are installed in the wellbore of hydrocarbon producing wells to shut off the production flow to the surface in case of an emergency.
Pdf reliability study of subsurface safety valve control. The valve is designed to provide subsurface isolation to minimize loss of production and protect human life. Achieve ultimate valve control and absolute well safety. Wirelineretrievable safety valves weatherford international. Camco products and services rashmi bhavsar camco products and services. Standard features include a surface safety valve ssv and a surface controlled subsurface safety valve scssv for the process control and safety shutdown. Abstract subsurface safety valves is an integral part of well completions, that provides the ultimate protection against uncontrolled flow from producing oil and. These pressures are also recorded on a data acquisition system. Two types of subsurface safety valve are available. A subsurface safety valve of claim 1 wherein a first end of the plug is configured to prevent the plug from reentering the opening once the first end of the plug has been withdrawn. Reliability study of subsurface safety valve control system in oil wells.
They monitor flowline pressure, detect high sand production, perform alarm functions, and when required, shut in the well in case of fire or activation of a manual emergency shutdown station. Dec 10, 2017 mms regulations state that the valve must be placed no less than 100. The scssv functional characteristics should include but are not limited to the following. King engineering vocational training book 5 wireline operations and procedures. Test safety valves and other equipment at the intervals specified in the tables set forth in paragraph c.
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