CN112081553B - Safety valve for high-temperature high-pressure deep well - Google Patents
Safety valve for high-temperature high-pressure deep well Download PDFInfo
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- CN112081553B CN112081553B CN202010838214.1A CN202010838214A CN112081553B CN 112081553 B CN112081553 B CN 112081553B CN 202010838214 A CN202010838214 A CN 202010838214A CN 112081553 B CN112081553 B CN 112081553B
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- 238000007789 sealing Methods 0.000 claims abstract description 161
- 230000007246 mechanism Effects 0.000 claims abstract description 94
- 239000002184 metal Substances 0.000 claims abstract description 60
- 238000002955 isolation Methods 0.000 claims abstract description 14
- 229910000831 Steel Inorganic materials 0.000 claims description 12
- 239000010959 steel Substances 0.000 claims description 12
- 239000012634 fragment Substances 0.000 claims description 9
- 238000007790 scraping Methods 0.000 claims description 8
- 230000008021 deposition Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 6
- 230000008569 process Effects 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 2
- 238000011084 recovery Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000004873 anchoring Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000002343 natural gas well Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/10—Valve arrangements for boreholes or wells in wells operated by control fluid supplied from outside the borehole
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/10—Valve arrangements for boreholes or wells in wells operated by control fluid supplied from outside the borehole
- E21B34/105—Valve arrangements for boreholes or wells in wells operated by control fluid supplied from outside the borehole retrievable, e.g. wire line retrievable, i.e. with an element which can be landed into a landing-nipple provided with a passage for control fluid
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/14—Valve arrangements for boreholes or wells in wells operated by movement of tools, e.g. sleeve valves operated by pistons or wire line tools
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Safety Valves (AREA)
Abstract
The invention discloses a high-temperature high-pressure deep well lower safety valve, which comprises a hydraulic cavity, a piston mechanism, a position sealing mechanism, a length adapting mechanism, an isolating mechanism, a spring cylinder, a bearing, a connecting sleeve, a valve plate sealing mechanism and a lower joint, wherein the piston mechanism is arranged in the hydraulic cavity; when the underground safety valve is in an open state and a closed state by the position sealing mechanism, metal sealing is formed between the piston mechanism and the position sealing mechanism; when the underground safety valve is in an open state by the length adapting mechanism, metal sealing is formed between the isolation mechanism and the lower joint and between the piston mechanism and the position sealing mechanism simultaneously; the bearing eliminates the torque generated by the spring in the assembling and compressing processes, and eliminates the risk of failure of the underground safety valve caused by the fact that a piston mechanism is twisted and bent in the assembling and compressing processes of the high-strength spring of the safety valve under the deep well under high temperature and high pressure; the conical surface metal seal is adopted between the valve plate sealing mechanism and the spring barrel, the spherical surface metal seal is adopted inside the valve plate sealing mechanism, and the problem that the valve plate of the high-temperature and high-pressure underground safety valve is easy to seal and lose effect is solved.
Description
Technical Field
The invention belongs to the technical field of petroleum and natural gas well completion, and particularly relates to a safety valve for a deep well under high temperature and high pressure.
Background
In the technical field of oil and gas well completion, a downhole safety valve is a very important well completion tool. The underground safety valve is a normally closed valve, the ground is required to continuously stabilize the pressure of a hydraulic control pipeline so as to keep the hydraulic control pipeline open, and the underground safety valve is closed abnormally due to the fact that a piston mechanism is prone to failure in the continuous pressure stabilizing process; the spring elasticity of the safety valve under the deep well is large, the torque generated in the assembling process and the compression process is large, and the piston mechanism is easily twisted and bent to cause that the underground safety valve cannot be closed; elastic sealing is usually adopted between the valve plate sealing mechanism and the body, and sealing failure is easy to occur in a high-temperature high-pressure well.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a safety valve for a deep well under high temperature and high pressure.
The invention is realized by the following technical scheme:
a high-temperature high-pressure deep well lower safety valve comprises a hydraulic cavity, a piston mechanism, a position sealing mechanism, a length adapting mechanism, an isolating mechanism, a spring barrel, a bearing, a connecting sleeve, a valve plate sealing mechanism and a lower joint; the lower end of the hydraulic cavity is connected with the upper end of the spring cylinder, the lower end of the spring cylinder is connected with the upper end of the connecting sleeve, the lower end of the connecting sleeve is connected with the upper end of the lower connector, and metal seals are formed by the connections; the piston mechanism is positioned in a piston cavity of the hydraulic cavity, and the lower end of the piston mechanism is connected with the length adapting mechanism; the length adapting mechanism is sleeved between the isolating mechanism and the spring barrel, and the lower end of the length adapting mechanism is connected with the spring; the lower end of the bearing is supported on a step in the spring barrel, and the upper end of the bearing is connected with the spring; the position sealing mechanism and the isolation mechanism are fixed on the hydraulic cavity through screws, and the upper end of the valve plate sealing mechanism is connected with the lower end of the spring barrel.
The piston mechanism comprises an upper piston rod, a piston cap, a sealing rod, a lower piston rod, a sealing assembly and a scraping ring, wherein the upper end of the sealing rod is connected with the piston cap, the lower end of the sealing rod is connected with the upper end of the upper piston rod, the upper end of the lower piston rod is connected with the upper piston rod, the lower end of the lower piston rod is connected with a length adapting mechanism, the sealing assembly is sleeved on the sealing rod, and the scraping ring is sleeved on the upper piston rod;
the position sealing mechanism comprises a metal sealing ring, a pressing plate and a fixing screw, the metal sealing ring is arranged in a sealing groove of the hydraulic cavity, and the pressing plate is fixed on the hydraulic cavity through the fixing screw;
the length adapting mechanism comprises a hoop sleeve, a limiting sleeve and a disc spring, the upper end of the hoop sleeve is connected with the lower end of the lower piston rod, the lower end of the hoop sleeve is connected with the upper end of the limiting sleeve, and the disc spring is arranged between the hoop sleeve and the limiting sleeve;
the isolation mechanism comprises an extension sleeve, a flow pipe and a fragment isolation ring, the extension sleeve is connected to the hydraulic cavity through a fixing screw, the flow pipe is sleeved outside the extension sleeve, the fragment isolation ring is arranged on the inner side of the flow pipe to effectively prevent fragment deposition, an upper boss is positioned inside the length adapting mechanism, the upper end of the upper boss is connected with the disc spring, and the lower end of the upper boss is connected with the upper end of the limit sleeve;
the bearing comprises an upper bearing seat, a bearing ball, a support ring and a lower bearing seat, wherein the upper bearing seat is connected with the lower bearing seat through a step;
the valve plate sealing mechanism comprises a valve seat, a valve plate pin, a valve plate, a torsion spring, a plate spring, a balance plug and a positioning pin, wherein the upper end of the valve seat is connected with the lower end of a spring barrel, the valve plate is connected with the valve seat through the valve plate pin, the torsion spring is sleeved on the valve plate pin, and the plate spring and the balance plug are arranged on the valve plate.
In the technical scheme, a locking section and a sealing surface are arranged in the hydraulic cavity, the sealing surface is arranged in the lower joint and used for putting in the steel wire recovery safety valve, the hydraulic cavity is internally provided with a groove, and the wall between the groove and the piston cavity is thin and can be punctured by a special tool and used for controlling the steel wire recovery safety valve;
in the technical scheme, an external sealing surface, an upper sealing surface and a lower sealing surface are arranged on the metal sealing ring, a sealing groove is arranged on the hydraulic cavity, a sealing surface is arranged on the upper piston rod, a sealing surface is arranged on the lower piston rod, the external sealing surface on the metal sealing ring and the sealing groove on the hydraulic cavity form a metal seal, when the underground safety valve is opened, the upper sealing surface of the metal sealing ring and the sealing surface on the upper piston rod form a metal seal, and when the underground safety valve is closed, the lower sealing surface of the metal sealing ring and the sealing surface on the lower piston rod form a metal seal.
In the technical scheme, the disc spring is assembled in an involutory mode, and pretightening force is generated in an assembled state.
In the technical scheme, the groove is formed in the flow pipe, and the flow pipe can be moved downwards by a special tool to open the underground safety valve.
In the above technical scheme, the upper bearing seat and the lower bearing seat are both provided with steps, and the upper bearing seat is provided with grooves which are uniformly distributed in the circumferential direction.
In the technical scheme, the spring cylinder and the valve seat are connected through threads, both are provided with conical metal sealing surfaces, the two threads are screwed to form sealing, and a spherical metal sealing surface is arranged between the valve seat and the valve plate.
In the technical scheme, the spring cylinder and the valve seat are connected through threads, conical metal sealing surfaces are arranged on the spring cylinder and the valve seat, the two threads are screwed to form sealing, a groove is formed in the valve seat, the flow pipe is propped in the groove after the safety valve is opened by a special tool, and the safety valve in the deep well under high temperature and high pressure is in a permanent opening state.
In the above technical scheme, the valve plate is provided with a spherical metal sealing surface, and forms a spherical metal seal with the valve seat.
The invention has the advantages and beneficial effects that:
1. when the underground safety valve is in an open state and a closed state by the position sealing mechanism, metal sealing is formed between the piston mechanism and the position sealing mechanism, so that the sealing reliability of the piston mechanism is improved;
2. when the underground safety valve is in an open state by the length adapting mechanism, metal sealing is formed between the isolation mechanism and the lower joint and between the piston mechanism and the position sealing mechanism simultaneously;
3. the bearing eliminates the torque generated by the spring in the assembling and compressing processes, and eliminates the risk of failure of the underground safety valve caused by the fact that a piston mechanism is twisted and bent in the assembling and compressing processes of the high-strength spring of the deep underground safety valve under high temperature and high pressure;
4. the conical surface metal seal is adopted between the valve plate sealing mechanism and the spring barrel, and the spherical surface metal seal is adopted inside the valve plate sealing mechanism, so that the problem of high-temperature high-pressure downhole safety valve plate seal volatile effect is solved.
Drawings
Fig. 1-1a is a schematic structural diagram (top) of a safety valve for a deep well under high temperature and high pressure according to the present invention.
Fig. 1-1b is a schematic structural diagram (lower) of a safety valve for a deep well under high temperature and high pressure according to the present invention.
Fig. 1-2 is a perspective structural schematic view of a safety valve under a deep well under high temperature and high pressure according to the invention.
Fig. 1-3 are enlarged partial views of section I of fig. 1-1 a.
Fig. 1-4 are enlarged partial views of section II of fig. 1-1 a.
FIGS. 1-5 are enlarged partial views of section III of FIGS. 1-1 a.
Fig. 1-6 are enlarged partial views of the portion IV of fig. 1-1 b.
Fig. 1-7 are enlarged partial schematic views of a section a-a in fig. 1-1 a.
Fig. 2 is a schematic diagram of the hydraulic chamber structure of the present invention.
Fig. 3 is a schematic view of a lower connector structure according to the present invention.
Fig. 4 is a schematic view of the anchoring mechanism of the present invention.
Fig. 5 is a schematic view of the upper piston rod structure of the present invention.
Fig. 6 is a schematic view of the lower piston rod structure of the present invention.
Fig. 7 is a schematic view of the flow tube configuration of the present invention.
Fig. 8-1 is a schematic structural view of the upper bearing housing of the present invention.
Fig. 8-2 is a schematic view of the lower bearing seat structure of the present invention.
Fig. 9 is a schematic view of the valve seat structure of the present invention.
FIG. 10-1 is a schematic view (I) of the valve plate structure of the present invention.
Fig. 10-2 is a schematic view (two) of the valve plate structure of the present invention.
Wherein, 1 is a hydraulic cavity, 2 is an upper piston rod, 3 is a hoop sleeve, 4 is a limit sleeve, 5 is an extension sleeve, 6 is a spring, 7 is a flow tube, 8 is a spring cylinder, 9 is a connecting sleeve, 10 is a valve seat, 11 is a valve plate pin, 12 is a valve plate, 13 is a lower joint, 14 is a torsion spring, 15 is a plate spring, 16 is a balance plug, 17 is a piston cap, 18 is a sealing rod, 19 is a metal sealing ring, 20 is a disc spring, 21 is an upper bearing seat, 22 is a bearing ball, 23 is a supporting ring, 24 is a lower bearing seat, 25 is a pressure plate, 26 is a screw, 27 is a lower piston rod, 28 is a positioning pin, 29 is a sealing component, 30 is a scraping ring, 31 is a debris isolating ring, 32 is a locking section, 33 is a sealing surface, 34 is a piston cavity, 35 is a groove, 36 is a sealing groove, 37 is a sealing step, 38 is a sealing surface, 39 is an outer sealing surface, 40 is an upper sealing surface, 41 is a lower sealing surface, 42 is a sealing surface, 43 is a sealing surface, 44 is a boss, 45 is a groove, 46-groove; 47 is a step, 48 is a step, 49 is a conical metal seal face, 50 is a groove, 51 is a spherical metal seal face, 52 is a spherical metal seal face, and 53 is a detent.
For a person skilled in the art, other relevant figures can be obtained from the above figures without inventive effort.
Detailed Description
In order to make the technical solution of the present invention better understood, the technical solution of the present invention is further described below with reference to specific examples.
Examples
Referring to fig. 1, a safety valve for deep wells under high temperature and high pressure. The hydraulic piston type hydraulic piston mainly comprises a hydraulic cavity 1, an upper piston rod 2, a hoop sleeve 3, a limiting sleeve 4, an extension sleeve 5, a spring 6, a flow pipe 7, a spring cylinder 8, a connecting sleeve 9, a valve seat 10, a valve plate pin 11, a valve plate 12, a lower joint 13, a torsion spring 14, a plate spring 15, a balance plug 16, a 17-piston cap 17, an 18-sealing rod 18, a 19-metal sealing ring 19, a disc spring 20, an upper bearing seat 21, a bearing ball 22, a supporting ring 23, a lower bearing seat 24, a pressing plate 25, a screw 26, a lower piston rod 27, a positioning pin 28, a sealing assembly 29, a scraping ring 30, a debris isolating ring 31 and the like.
The lower end of the hydraulic cavity 1 is connected with the upper end of the spring cylinder 8, the lower end of the spring cylinder 8 is connected with the upper end of the connecting sleeve 9, the lower end of the connecting sleeve 9 is connected with the upper end of the lower connector 13, and metal seals are formed by the connections;
the piston mechanism is positioned in the piston cavity 34 of the hydraulic cavity 1, and the lower end of the piston mechanism is connected with the length adapting mechanism; the length adapting mechanism is sleeved between the isolating mechanism and the spring barrel 8, and the lower end of the length adapting mechanism is connected with the spring 6; the lower end of the bearing is supported 24 on a step in the spring barrel 8, and the upper end of the bearing is connected with the spring 6; the position sealing mechanism and the isolation mechanism are fixed on the hydraulic cavity 1 through screws, and the upper end of the valve plate sealing mechanism is connected with the lower end of the spring cylinder 8.
The piston mechanism comprises an upper piston rod 2, a piston cap 17, a sealing rod 18, a lower piston rod 27, a sealing assembly 29 and a scraping ring 30, wherein the upper end of the sealing rod 18 is connected with the piston cap 17, the lower end of the sealing rod is connected with the upper end of the upper piston rod 2, the upper end of the lower piston rod 27 is connected with the upper piston rod 2, the lower end of the lower piston rod 27 is connected with a length adapting mechanism, the sealing assembly 29 is sleeved on the sealing rod 18, and the scraping ring 30 is sleeved on the upper piston rod 2;
the position sealing mechanism comprises a metal sealing ring 19, a pressure plate 25 and a fixing screw 26, wherein the metal sealing ring 19 is arranged in a sealing groove 36 of the hydraulic cavity 1, and the pressure plate 25 is fixed on the hydraulic cavity 1 through the fixing screw 26;
the length adapting mechanism comprises a hoop sleeve 3, a limiting sleeve 4 and a disc spring 20, the upper end of the hoop sleeve 3 is connected with the lower end of the lower piston rod 27, the lower end of the hoop sleeve is connected with the upper end of the limiting sleeve 4, and the disc spring 20 is arranged between the hoop sleeve 3 and the limiting sleeve 4;
the isolation mechanism comprises an extension sleeve 5, a flow pipe 7 and a fragment isolation ring 31, the extension sleeve 5 is connected to the hydraulic cavity 1 through a screw 26, the flow pipe 7 is sleeved outside the extension sleeve 5, the fragment isolation ring 31 is arranged inside the flow pipe 7, the fragment deposition is effectively prevented, an upper boss 44 is located inside the length adapting mechanism, the upper end of the upper boss is connected with the disc spring 20, and the lower end of the upper boss is connected with the upper end of the limit sleeve 4;
the bearing comprises an upper bearing seat 21, a bearing ball 22, a support ring 23 and a lower bearing seat 24, wherein the upper bearing seat 21 is connected with the lower bearing seat 24 through a step, the bearing ball 22 is arranged in a circular groove of the upper bearing seat 21 and the lower bearing seat 24, and the support ring 23 is positioned between the upper bearing seat 21 and the lower bearing seat 24;
the valve plate sealing mechanism comprises a valve seat 10, a valve plate pin 11, a valve plate 12, a torsion spring 14, a plate spring 15, a balance plug 16 and a positioning pin 28, wherein the upper end of the valve seat 10 is connected with the lower end of a spring barrel 8, the valve plate 12 is connected with the valve seat 10 through the valve plate pin 11, the torsion spring 14 is sleeved on the valve plate pin 11, and the plate spring 15 and the balance plug 16 are arranged on the valve plate 12;
referring to fig. 2 and 3, a locking section 32 and a sealing surface 33 are arranged inside the hydraulic chamber 1, a sealing surface 38 is arranged inside the lower joint 13 and used for releasing a steel wire recovery safety valve, a groove 35 is arranged inside the hydraulic chamber 1, and the wall between the groove 35 and the piston chamber 34 is thin and can be punctured by a special tool and used for controlling the steel wire recovery safety valve;
referring to fig. 2, 4, 5 and 6, an external sealing surface 39, an upper sealing surface 40 and a lower sealing surface 41 are arranged on the metal sealing ring 19, a sealing groove 36 is arranged on the hydraulic chamber 1, a sealing surface 42 is arranged on the upper piston rod 2, a sealing surface 43 is arranged on the lower piston rod 27, the external sealing surface 39 on the metal sealing ring 19 and the sealing groove 36 on the hydraulic chamber 1 form a metal seal, when the downhole safety valve is opened, the upper sealing surface 40 on the metal sealing ring 19 and the sealing surface 42 on the upper piston rod 2 form a metal seal, and when the downhole safety valve is closed, the lower sealing surface 41 on the metal sealing ring 19 and the sealing surface 43 on the lower piston rod 27 form a metal seal;
referring to fig. 1, the disc spring 20 is assembled by involution, and has a pre-tightening force in an assembled state;
referring to fig. 7, a groove 44 is formed in the flow tube 7, and can be moved downwards by a special tool to open the downhole safety valve;
referring to fig. 8, the upper bearing seat 21 and the lower bearing seat 24 are both provided with steps 47 and 48, the step 47 of the upper bearing seat 21 is in interference fit with the step 48 of the lower bearing seat 24, and the upper bearing seat 21 is provided with grooves 46 uniformly distributed on the circumference;
referring to fig. 9, the spring cylinder 8 and the valve seat 10 are connected through threads, both are provided with conical metal sealing surfaces 49, the two are screwed tightly to form a seal, a groove 50 is formed in the valve seat 10, the flow tube 7 is supported in the groove 50 after the safety valve is opened by a special tool, and the safety valve under the deep well under high temperature and high pressure is in a permanent opening state;
referring to fig. 9 and 10, the valve plate 12 is provided with a spherical metal seal surface 52 that forms a spherical metal seal with the valve seat 10.
The working principle of the safety valve under the deep well under high temperature and high pressure is as follows:
assembling state: the spring 6 is in a compressed state, the sealing surface 43 of the lower piston rod 27 is pressed against the lower sealing surface 41 of the metal sealing ring 19, and the valve plate 12 is in a closed state under the action of the torsion spring 14, namely, the spherical metal sealing surface 52 of the valve plate 12 is attached to the spherical metal sealing surface 51 of the valve seat 10 to form a seal.
The working principle of opening the downhole safety valve is as follows: the ground is pressurized through a hydraulic control pipeline, hydraulic oil enters a piston cavity 34 of the hydraulic cavity 1, the piston mechanism is pushed to move downwards by hydraulic pressure, the piston mechanism pushes a length adapting mechanism to move downwards to compress a spring 6, a disc spring 20 is compressed to drive a flow pipe 7 to move downwards, the flow pipe 7 pushes a balance plug 16 open, then a valve plate 12 is pushed open, the pressure of the hydraulic control pipeline is continuously increased, the lower end of the flow pipe 7 is positioned on a sealing step 37 of a lower connector 13, the valve plate 12 is isolated from a central flow passage, and meanwhile, a sealing surface 42 of an upper piston rod 2 is attached to an upper sealing surface 40 of a metal sealing ring 19 to form metal sealing.
The working principle of closing the underground safety valve is as follows: the ground hydraulic control pipeline is decompressed, the spring 6 rebounds to drive the flow pipe 7, the length adapting mechanism and the piston mechanism to move upwards, the sealing surface 43 of the lower piston rod 27 is pressed against the lower sealing surface 41 of the metal sealing ring 19, and the valve plate is closed under the action of the torsion spring 14.
The working principle of forcibly opening the downhole safety valve is as follows: when the underground safety valve has a fault and needs to be forcibly opened, a special forced opening tool is put in, the forced opening tool is positioned in the groove 45 of the flow pipe 7 to drive the flow pipe 7 to move downwards, the lower end of the flow pipe 7 is positioned on the sealing step 37 of the lower connector 13, the valve plate 12 is opened, then the valve plate 12 is shocked downwards, the flow pipe 7 is radially expanded and clamped in the groove 50 of the valve seat 10, then the forced opening tool is taken out, and the underground safety valve is in an opening state. After the downhole safety valve is forcibly opened, the downhole safety valve cannot be closed again.
The working principle of the downhole safety valve with the steel wire recovery function is as follows: and (2) putting a communicating tool, carrying out circumferential positioning through a positioning groove 53 on the hydraulic cavity 1, breaking through the thin wall between the groove 35 of the hydraulic cavity 1 and the piston cavity 34 to communicate the piston cavity 34 with the central channel, then putting a steel wire recovery type downhole safety valve by adopting a steel wire tool, and seating the steel wire recovery type downhole safety valve on the locking section 34 of the hydraulic cavity 1, wherein a sealing piece of the steel wire recovery type downhole safety valve forms sealing with the sealing surface 33 of the hydraulic cavity 1 and the sealing surface 38 of the lower connector 13, and a hydraulic control pipeline can control the opening and closing of the steel wire recovery type downhole safety valve.
The numbering of the components as such, e.g. "first", "second", etc., is used herein only to distinguish the objects described, and not to have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings). In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like are used in the orientations and positional relationships indicated in the drawings, which are based on the orientations and positional relationships indicated in the drawings, and are used for convenience of description and simplicity of description, but do not indicate or imply that the devices or elements referred to must have specific orientations, be constructed and operated in specific orientations, and thus, should not be construed as limiting the present invention.
In the present invention, unless otherwise explicitly specified or limited, a first feature may be "on" or "under" a second feature in direct contact with the first and second features, or in indirect contact with the first and second features through an intermediate. Also, a first feature "on," "above," and "over" a second feature may be directly or obliquely above the second feature, or may simply mean that the first feature is at a higher level than the second feature. A first feature "under," "beneath," and "under" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
The invention has been described in an illustrative manner, and it is to be understood that any simple variations, modifications or other equivalent changes which can be made by one skilled in the art without departing from the spirit of the invention fall within the scope of the invention.
Claims (7)
1. The utility model provides a relief valve under deep well under high temperature high pressure greatly which characterized in that: the hydraulic sealing device comprises a hydraulic cavity, a piston mechanism, a position sealing mechanism, a length adapting mechanism, an isolating mechanism, a spring barrel, a bearing, a connecting sleeve, a valve plate sealing mechanism and a lower joint; the lower end of the hydraulic cavity is connected with the upper end of the spring cylinder, the lower end of the spring cylinder is connected with the upper end of the connecting sleeve, and the lower end of the connecting sleeve is connected with the upper end of the lower connector; the piston mechanism is positioned in a piston cavity of the hydraulic cavity, and the lower end of the piston mechanism is connected with the length adapting mechanism; the length adapting mechanism is sleeved between the isolating mechanism and the spring barrel, and the lower end of the length adapting mechanism is connected with the spring; the lower end of the bearing is supported on a step in the spring barrel, and the upper end of the bearing is connected with the spring; the position sealing mechanism and the isolation mechanism are fixed on the hydraulic cavity through screws, and the upper end of the valve plate sealing mechanism is connected with the lower end of the spring barrel;
the piston mechanism comprises an upper piston rod, a piston cap, a sealing rod, a lower piston rod, a sealing assembly and a scraping ring, wherein the upper end of the sealing rod is connected with the piston cap, the lower end of the sealing rod is connected with the upper end of the upper piston rod, the upper end of the lower piston rod is connected with the upper piston rod, the lower end of the lower piston rod is connected with a length adapting mechanism, the sealing assembly is sleeved on the sealing rod, and the scraping ring is sleeved on the upper piston rod;
the position sealing mechanism comprises a metal sealing ring, a pressing plate and a fixing screw, the metal sealing ring is arranged in a sealing groove of the hydraulic cavity, and the pressing plate is fixed on the hydraulic cavity through the fixing screw;
the length adapting mechanism comprises a hoop sleeve, a limiting sleeve and a disc spring, the upper end of the hoop sleeve is connected with the lower end of the lower piston rod, the lower end of the hoop sleeve is connected with the upper end of the limiting sleeve, and the disc spring is arranged between the hoop sleeve and the limiting sleeve;
the isolation mechanism comprises an extension sleeve, a flow pipe and a fragment isolation ring, the extension sleeve is connected to the hydraulic cavity through a fixing screw, the flow pipe is sleeved outside the extension sleeve, the fragment isolation ring is arranged on the inner side of the flow pipe to effectively prevent fragment deposition, an upper boss is positioned inside the length adapting mechanism, the upper end of the upper boss is connected with the disc spring, and the lower end of the upper boss is connected with the upper end of the limit sleeve;
the bearing comprises an upper bearing seat, a bearing ball, a support ring and a lower bearing seat, wherein the upper bearing seat is connected with the lower bearing seat through a step;
the valve plate sealing mechanism comprises a valve seat, a valve plate pin, a valve plate, a torsion spring, a plate spring, a balance plug and a positioning pin, wherein the upper end of the valve seat is connected with the lower end of a spring barrel, the valve plate is connected with the valve seat through the valve plate pin, the torsion spring is sleeved on the valve plate pin, and the plate spring and the balance plug are arranged on the valve plate;
the hydraulic pressure intracavity portion is provided with locking section and sealed face, the inside sealed face that is provided with of lower clutch for put in the steel wire and retrieve the relief valve, the intracavity portion of hydraulic pressure is provided with the recess, and the wall accessible specialized tool between this recess and the piston chamber punctures this wall, is used for controlling the steel wire and retrieves the relief valve.
2. The safety valve for high-temperature high-pressure deep wells according to claim 1, wherein: the underground safety valve is characterized in that an external sealing surface, an upper sealing surface and a lower sealing surface are arranged on the metal sealing ring, a sealing groove is formed in the hydraulic cavity, a sealing surface is arranged on the upper piston rod, a sealing surface is arranged on the lower piston rod, the external sealing surface on the metal sealing ring and the sealing groove on the hydraulic cavity form a metal seal, when the underground safety valve is opened, the upper sealing surface of the metal sealing ring and the sealing surface on the upper piston rod form a metal seal, and when the underground safety valve is closed, the lower sealing surface of the metal sealing ring and the sealing surface on the lower piston rod form a metal seal.
3. The safety valve for the deep well under high temperature and high pressure according to claim 1, wherein: the disc spring adopts a folding assembly mode, and has pretightening force in an assembly state.
4. The safety valve for high-temperature high-pressure deep wells according to claim 1, wherein: the flow pipe is internally provided with a groove, and can be moved downwards by a special tool to open the underground safety valve.
5. The safety valve for the deep well under high temperature and high pressure according to claim 1, wherein: the upper bearing seat and the lower bearing seat are both provided with steps, and the upper bearing seat is provided with grooves which are uniformly distributed on the circumference.
6. The safety valve for high-temperature high-pressure deep wells according to claim 1, wherein: the spring cylinder and the valve seat are connected through threads, both the spring cylinder and the valve seat are provided with conical surface metal sealing surfaces, the spring cylinder and the valve seat form sealing after being screwed tightly, and a spherical surface metal sealing surface is arranged between the valve seat and the valve plate.
7. The safety valve for the deep well under high temperature and high pressure according to claim 1, wherein: the valve plate is provided with a spherical metal sealing surface, and forms spherical metal sealing with the valve seat.
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| CN202010838214.1A CN112081553B (en) | 2020-08-19 | 2020-08-19 | Safety valve for high-temperature high-pressure deep well |
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| CN202010838214.1A CN112081553B (en) | 2020-08-19 | 2020-08-19 | Safety valve for high-temperature high-pressure deep well |
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| CN112081553B true CN112081553B (en) | 2022-05-06 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112412396B (en) * | 2020-11-19 | 2021-10-26 | 中国石油大学(北京) | Downhole safety valve |
| CN113565466B (en) * | 2021-05-26 | 2023-09-01 | 中国海洋石油集团有限公司 | Electric control liquid drive type underground flow control valve |
| CN115822519B (en) * | 2022-12-27 | 2024-05-17 | 西南石油大学 | Locking type underground safety valve |
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| EP0521667A1 (en) * | 1991-07-05 | 1993-01-07 | Halliburton Company | Safety valve sealing ring and seal assembly |
| CN201593397U (en) * | 2009-12-01 | 2010-09-29 | 中国石油化工股份有限公司 | Downhole safety valve for oil and gas wells |
| CN102720464A (en) * | 2012-07-04 | 2012-10-10 | 湖南唯科拓石油科技服务有限公司 | Subsurface safety valve |
| CN206129233U (en) * | 2016-10-17 | 2017-04-26 | 荆州市赛瑞能源技术有限公司 | Self -balancing downhole safety valve |
| CN208669272U (en) * | 2018-08-06 | 2019-03-29 | 惟其信石油机械(天津)有限公司 | A kind of storm valve |
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2020
- 2020-08-19 CN CN202010838214.1A patent/CN112081553B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0521667A1 (en) * | 1991-07-05 | 1993-01-07 | Halliburton Company | Safety valve sealing ring and seal assembly |
| CN201593397U (en) * | 2009-12-01 | 2010-09-29 | 中国石油化工股份有限公司 | Downhole safety valve for oil and gas wells |
| CN102720464A (en) * | 2012-07-04 | 2012-10-10 | 湖南唯科拓石油科技服务有限公司 | Subsurface safety valve |
| CN206129233U (en) * | 2016-10-17 | 2017-04-26 | 荆州市赛瑞能源技术有限公司 | Self -balancing downhole safety valve |
| CN208669272U (en) * | 2018-08-06 | 2019-03-29 | 惟其信石油机械(天津)有限公司 | A kind of storm valve |
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| CN112081553A (en) | 2020-12-15 |
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