An annular hydraulic control safety valve
A safety valve and hydraulic technology, applied in wellbore/well valve devices, wellbore/well parts, earthwork drilling and production, etc., can solve problems such as inability to realize well control, safety risks, etc., achieve simple structure and avoid safety risks , good effect
Active Publication Date: 2017-11-24
HUNAN VICTOR PETROTECH SERVICE
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Problems solved by technology
like image 3 As shown, the inner tubing can realize downhole control through the small-diameter downhole safety valve, but the channel between the inner and outer tubing is still unable to achieve downhole well control in the existing technology
This presents a safety risk to the process
Method used
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[0021] Such as figure 1 , 2 As shown, the present invention includes a pipe body, and the pipe body includes a casing nipple 20, an upper joint 2, a middle joint 3, a cylinder body 16, and a lower joint 18 connected in sequence, all of which are connected by sealing threads; the middle joint 3 is internally connected The upper core tube 1, the casing nipple 20 and the variable button joint 19 are externally connected and sealed by the casing thread, and the inside of the middle joint 3, the cylinder body 16 and the lower joint 18 are sequentially provided with a piston 8, a leakage sleeve 11 and a central tube 15, There is a flow channel space 22 between the middle joint 3 and the cylinder body 16; the middle joint 3 is provided with a pressure inlet port through the top plug 4, ferrule 5, and sealing ring 6, and the outside of the pressure inlet port is connected to the control pipeline using NPT threads , straight to the ground, internally communicated with the piston cavi...
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The invention discloses an annular hydraulic control safety valve which comprises a pipe body, a piston, a leakage sleeve and a center pipe, wherein the piston, the leakage sleeve and the center pipe are sequentially arranged in the pipe body. An entrance pressure joint is arranged on the pipe body and communicated with a piston cavity of the piston, a flow channel space and a distribution passage communicated with the flow channel space are formed in the wall of the pipe body, the leakage sleeve and the pipe are sealed, a slot is formed in the leakage sleeve and communicated with the flow channel space in the wall of the pipe body when the leakage sleeve moves, and an elastic return mechanism for the center pipe is arranged in a cylinder. The annular hydraulic control safety valve is simple in structure and fine in use effect, underground control of a passage between an inner oil pipe and an outer oil pipe can be realized, and safety risk in oil-gas production is effectively avoided.
Description
technical field [0001] The invention belongs to a well control device for oil and natural gas exploitation, and in particular relates to an annulus hydraulic control safety valve. Background technique [0002] In modern oil and gas production, the development process of using inner and outer double-layer tubing to provide multi-layer fluid channels is often used. The process can provide dual fluid pathways in one well. Such as image 3 As shown, the inner oil pipe can realize downhole control through the small-diameter downhole safety valve, but the channel between the inner and outer oil pipes is still unable to realize downhole well control in the prior art. This presents a safety risk to the process. Contents of the invention [0003] The purpose of the present invention is to provide an annular space hydraulic control safety valve which can realize downhole control between inner and outer oil pipes. [0004] The technical scheme that realizes the object of the prese...
Claims
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IPC IPC(8): E21B34/10
CPCE21B34/10
Inventor 不公告发明人
Owner HUNAN VICTOR PETROTECH SERVICE