CN110029974B - Pre-tightening adjustable constant-current blanking plug - Google Patents
Pre-tightening adjustable constant-current blanking plug Download PDFInfo
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- CN110029974B CN110029974B CN201910453241.4A CN201910453241A CN110029974B CN 110029974 B CN110029974 B CN 110029974B CN 201910453241 A CN201910453241 A CN 201910453241A CN 110029974 B CN110029974 B CN 110029974B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 65
- 238000002347 injection Methods 0.000 claims abstract description 33
- 239000007924 injection Substances 0.000 claims abstract description 33
- 230000001105 regulatory effect Effects 0.000 claims abstract description 26
- 238000007789 sealing Methods 0.000 claims abstract description 8
- 230000006835 compression Effects 0.000 abstract description 8
- 238000007906 compression Methods 0.000 abstract description 8
- 230000015572 biosynthetic process Effects 0.000 abstract description 4
- 238000000605 extraction Methods 0.000 abstract description 2
- 230000000694 effects Effects 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 7
- 238000007599 discharging Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 239000010779 crude oil Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000004391 petroleum recovery Methods 0.000 description 1
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Classifications
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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
- E21B34/08—Valve arrangements for boreholes or wells in wells responsive to flow or pressure of the fluid obtained
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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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/20—Displacing by water
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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)
- Nozzles (AREA)
- Lift Valve (AREA)
Abstract
A pre-tightening adjustable constant-current blanking plug. The adjustable constant-current blanking plug mainly aims to solve the problems that the existing adjustable constant-current blanking plug is small in flow adjusting range, low in control precision and the like. The blanking plug comprises a fishing rod, an upper cover, a spring, a blanking plug main body, a cam, a pin, a valve rod, an adjusting nut, a main sealing ring, a main spring, a valve core, an adjusting valve seat and a filter screen; the injected water enters the plug through the bottom hole of the valve seat through the filter screen and then is injected into the stratum through the regulating valve and the valve core, and the valve core can reciprocate in the plug body to achieve balance due to the change of injection pressure or stratum pressure and the effect of spring elasticity, so that constant-flow water injection can be finally realized. The invention mainly changes the flow entering the blanking plug and the elasticity of the spring by adjusting the opening of the adjustable valve and the initial compression amount of the main spring so as to realize constant flow when the pressure of the formation or the pressure of injected water changes, and is suitable for separated layer water injection oil extraction.
Description
Technical Field
The invention relates to an underground tool applied to the field of oil and gas field development, in particular to an underground adjustable constant-flow water injection plug.
Background
In order to further improve the recovery ratio of crude oil, the water injection technology in secondary oil recovery has become an important means for oil field development. At present, most of domestic oil fields enter a high-water-content development period, and water injection work is more and more emphasized in order to increase water injection volume and improve crude oil recovery. The blanking plug is an important part of the layered water injection technology, the current blanking plug is mainly a universal type of a replaceable water nozzle, a proper water nozzle is selected according to the water injection quantity requirement, and the blanking plug is thrown into a well and is seated in a side hole of a working cylinder of an eccentric water distributor after being installed. Under ideal conditions, the water injection quantity can meet the requirements. But when the operating conditions change, for example: the water injection pressure of the water injection station reaching the water injection well through the pipe network system changes, the pressure of the complicated and changeable underground oil layer water injection layer changes, and at the moment, the flow is not constant any more. The water nozzle needs to be replaced by repeatedly throwing labor to achieve the expected water injection amount, the cost is increased, and the oil production rate is reduced. For this purpose, the applicant proposed an adjustable constant flow water injection plug of patent No. 201810516322X. However, such blanking plugs also have disadvantages, namely: the flow regulating range and the flow control precision of the blanking plug are small due to the small constant flow range of the same spring.
Disclosure of Invention
In order to solve the technical problems mentioned in the background technology, the invention provides a pre-tightening type adjustable constant-current plug, which optimizes a valve core structure by changing the relationship matching between the initial compression amount of a main spring and the opening degree of an adjustable valve, has higher flow regulation precision and larger regulation range, and ensures that the valve core can realize constant flow with the spring with the same rigidity under different flows in a balanced manner.
The technical scheme of the invention is as follows: the pre-tightening adjustable constant-current blanking plug comprises a fishing rod 1 and is characterized in that: the blanking plug further comprises an upper cover 2, an upper cover sealing ring 3, a spring 4, a blanking plug main body 5, a cam 6, a pin 7, a valve rod 8, an adjusting nut 9, a main sealing ring 10, a main spring 11, a valve core 12, an adjusting valve 13, an adjusting valve seat 14 and a filter screen 15.
The fishing rod 1 has a cylindrical surface 101, a circular truncated cone 102, a circular truncated cone bottom surface 103, and a hexagon socket hollow hole 104 formed in the lower portion.
The blanking plug main body 5 is sequentially provided with an upper cavity surface 52, a pin hole 53, a cam groove surface 54, an internal thread 55, a water outlet 56 and a lower connecting structure 57, the internal thread 55 is in threaded connection with the adjusting nut 9, a pin penetrates through the pin hole 53 and a central hole 62 of the cam to be fixed, and the lower connecting structure 57 is in threaded connection with the internal thread surface 151 of the filter screen.
The middle part of the cam 6 is of a hollow structure and is provided with an upper plane 61, a central hole 62 and an outer plane 63, so that the valve rod 8 can penetrate through the cam without influencing the rotation of the cam when the cam is locked in a throwing and fishing manner, namely the rotation of the cam and the valve rod does not influence each other.
The upper part of the valve rod 8 is provided with a regular hexagon rod 81 which is matched with an inner hexagon hollow hole 104 of the fishing rod 1, and after the regular hexagon rod 81 is matched with the inner hexagon hollow hole, a certain gap exists at the top part so that the valve rod can slide up and down in the hollow hole and can be fixed in the circumferential direction, namely can not rotate; the middle part of the valve rod is a cylindrical rod 82 which is in clearance fit with the central hole surface 122 of the valve core, and the lower part of the valve rod is a small section of cylindrical rod 83 provided with external threads and in threaded connection with the thread surface 131 on the regulating valve.
The adjusting nut 9 is a cylinder with a hollow hole 91 in the shape of a regular hexagonal prism, an external thread surface 92 and a bottom surface 93; the regular hexagonal prism hollow hole 91 is in clearance fit with the valve rod 8, so that the adjusting nut can rotate along with the valve rod and slide up and down, the external thread surface 92 is in threaded fit with the internal thread 55 of the plug body, so that the adjusting nut can move up and down along with the rotation, and the bottom surface 93 presses the main spring 11.
The valve core 12 is provided with a small cylindrical surface 121, a central hole surface 122, a boss surface 123, a sliding surface 124, a joint surface 125 and a rectangular water outlet groove 1201, two rectangular water outlet grooves 1201 symmetrical along a symmetrical surface 1202 are formed in two sides of the lower part of the boss surface 123, and the height of each rectangular water outlet groove is consistent with the diameter of the water outlet 56 of the blanking plug main body 5; the sliding surface 124 is in clearance fit with the inner surface of the water injection plug main body 5, so that the valve core can slide up and down, the central hole surface 122 is in clearance fit with the valve rod 8, so that the valve core can move up and down, injected water can flow into an upper cavity formed by the plug main body and the valve core through a clearance, and the main spring 11 is arranged between the boss surface 123 and the adjusting nut 9.
The regulating valve 13 is a cylindrical body having an upper threaded surface 131, an outer threaded surface 132 and a bottom surface 133; a cylindrical thread groove is formed in the center of the upper end of the regulating valve 13, is matched with a cylindrical threaded rod at the tail of the valve rod 8 and can rotate along with the valve rod; the lower end of the regulating valve 13 is provided with a rectangular two-side through groove 1301 with a certain depth, the rectangular two-side through groove is concentric with the regulating valve, and the thread turning direction of the rectangular two-side through groove is opposite to that of the regulating nut.
The adjusting valve seat 14 is provided with a threaded hole 141, a small outer circular surface 142, a circular table surface 143 and a bottom surface 144; the exterior of the regulating valve seat 14 is a cylinder with two steps, the lower end is a cylindrical table with a round hole at the center, a hollow cylinder with steps is arranged above the round table surface 143, and an internal thread hole 141 matched with the regulating valve external thread surface 132 is arranged in the hollow cylinder; the circular table 143 is pressed by the lower end of the stopper body during assembly to play a role in fixing.
The strainer 15 has an internal thread surface 151, an inner wall surface 152, and a bottom surface 153; the bottom surface 153 mates with the regulator valve seat bottom surface 144 and the internally threaded surface threadably engages the plug body lower attachment structure 57.
The invention has the following beneficial effects: the constant flow principle of the traditional constant flow blanking plug is that the elastic force of a spring is balanced with the fluid pressure borne by a valve core, so that constant flow is realized. However, if the size of the water nozzle is changed, and further the flow is changed, the valve core is difficult to balance with the spring under the same working condition after the stress is changed, and the constant flow can not be realized any more. The technical proposal provided by the invention leads the injected water to enter the blanking plug through the bottom hole of the adjusting valve seat by the filter screen and then to be injected into the stratum by the adjusting valve and the valve core. Because the valve core can reciprocate in the main body of the water injection plug under the action of injection pressure or formation pressure change and spring elasticity, the balance can be finally achieved, and constant-flow water injection can be realized. If the flow of injected water is not constant when the flow of injected water changes or the formation pressure changes, the fishing rod can be rotated by the measuring and adjusting instrument to adjust the opening of the adjusting valve and the position of the adjusting nut to control the flow entering the blanking plug and the initial compression amount of the spring, so that adjustable constant-flow water injection is realized.
The adjustable valve is adopted to replace the prior fixed water nozzle, the opening of the adjusting valve can be changed underground, the initial compression amount of the spring is changed at the same time, so that the valve core can achieve balance with the same spring under different water injection amounts (the pitch ratio between the adjusting valve and the valve seat connected with the blanking plug main body and the adjusting nut is changed), the change of the compression amount of the rectangular valve and the spring is linear, the research and calculation are easy, the operation is simple, the cost is saved, the underground adjustable constant-flow water injection is realized, and the petroleum recovery ratio can be effectively improved.
Description of the drawings:
FIG. 1 is a structural sectional view of the present invention
FIG. 2 is a cross-sectional view of a three-dimensional structure of the present invention
FIG. 3 is an exploded view of a three-dimensional structure of the present invention
FIG. 4 is a three-dimensional structural part drawing of the fishing rod of the present invention
FIG. 5 is a drawing showing the three-dimensional structure of the upper cover of the present invention
FIG. 6 is a drawing showing a three-dimensional structural part of the stopper body of the present invention
FIG. 7 is a three-dimensional structural part diagram of the valve rod of the present invention
FIG. 8 is a three-dimensional structural part view of the cam of the present invention
FIG. 9 is a three-dimensional structural detail view of an adjusting nut of the present invention
FIG. 10 is a drawing of a three-dimensional structural part of a main spring according to the present invention
FIG. 11 is a drawing showing a three-dimensional structure of a spring according to the present invention
FIG. 12 is a structural part view of a valve cartridge of the present invention
FIG. 13 is a three-dimensional structural component view of a regulator valve of the present invention
FIG. 14 is a three-dimensional structural drawing of an adjusting valve seat according to the present invention
FIG. 15 is a drawing of a three-dimensional structural part of the screen of the present invention
In the figure, 1-fishing rod, 2-upper cover, 3-upper cover sealing ring, 4-spring, 5-blanking plug main body, 6-cam, 7-pin, 8-valve rod, 9-adjusting nut, 10-main sealing ring, 11-main spring, 12-valve core, 13-adjusting valve, 14-adjusting valve seat and 15-filter screen.
The specific implementation mode is as follows:
the invention will be further described with reference to the accompanying drawings in which:
with reference to fig. 1 to 15, it can be seen that:
the fishing rod 1 is composed of a cylindrical surface 101, a circular truncated cone 102, a circular truncated cone bottom surface 103 and a hexagon socket hollow hole 104 formed at the lower part.
The blanking plug main body 5 is sequentially provided with an upper cavity surface 52, a pin hole 53, a cam groove surface 54, an internal thread 55, a water outlet 56 and a lower connecting structure 57, wherein the internal thread 55 is in threaded connection with an adjusting nut 92, the pin hole 53 fixes a cam 62 on the blanking plug main body through a pin, and the lower connecting structure 57 is in threaded connection with a filter screen internal thread surface 151.
The cam 6 is a hollow structure, namely the middle part of the cam is a hollow structure and consists of an upper plane 61, a central hole 62 and an outer plane 63, so that the valve rod 8 can penetrate through the cam without influencing the rotation of the cam when the cam is locked in a fishing way in the water injector, namely the rotation of the cam and the valve rod does not influence each other.
The upper part of the valve rod 8 is provided with a regular hexagon rod 81 which is matched with an inner hexagon hollow hole 104 of the fishing rod 1, and after the regular hexagon rod 81 is matched with the inner hexagon hollow hole, a certain gap exists at the top part so that the valve rod can slide up and down in the hollow hole and can be fixed in the circumferential direction, namely can not rotate; the middle part of the valve rod is a cylindrical rod 82 which is in clearance fit with the central hole surface 122 of the valve core, and the lower part of the valve rod is a small section of cylindrical rod 83 provided with external threads and in threaded connection with the thread surface 131 on the regulating valve.
The adjusting nut 9 is a hollow cylinder with an inner part, and comprises a hollow hole 91 with a regular hexagonal prism, an external thread surface 92 and a bottom surface 93. The regular hexagonal hollow hole 91 is in clearance fit with the regular hexagonal rod 81 of the valve stem, so that the adjusting nut can rotate along with the valve stem and slide up and down, the external thread surface 92 is in threaded fit with the internal thread 55 of the plug body, so that the adjusting nut can move up and down along with the rotation, and the bottom surface 93 presses the main spring 11.
The spool 12 is constituted by a small cylindrical surface 121, a central hole surface 122, a boss surface 123, a sliding surface 124, and a joint surface 125. The plug is formed by combining two hollow cylinders with different diameters, the small-diameter cylinder is arranged at the upper end, two rectangular water outlet grooves with two symmetrical sides are formed in the lower portion of the boss surface 123, and the height of each water outlet groove is consistent with the diameter of the water outlet 56 of the plug main body 5. The valve core 124 is in clearance fit with the inner surface of the water injection plug main body 5, so that the valve core can slide up and down, the central hole surface 122 is in clearance fit with the valve rod 8, so that the valve core can move up and down, injected water can flow into an upper cavity formed by the plug main body and the valve core through a clearance, and a main spring is arranged between the boss surface 123 and the adjusting nut 9.
The regulating valve 13 is composed of an upper thread surface 131, an external thread surface 132 and a bottom surface 133, and is substantially a cylinder with an external thread 132 on the outer surface, and a cylindrical thread groove is formed in the center of the upper end and is matched with a cylindrical threaded rod at the tail part of the valve rod 83 and can rotate along with the valve rod; the lower end is provided with a rectangular through groove 1301 with a certain depth, and the rectangular groove is concentric with the regulating valve.
The regulator valve seat 14 is formed of a threaded hole 141, a small outer circular surface 142, a circular table surface 143, and a bottom surface 144. The outer part of the cylinder is provided with 2 steps, the lower end of the cylinder is a cylindrical table with a circular hole at the center, a hollow cylinder with steps is arranged above the circular table surface 143, and the inner part of the cylinder is provided with an inner threaded hole 141 matched with the outer thread surface 132 of the regulating valve. The circular table 143 is pressed by the lower end of the stopper body during assembly to play a role in fixing.
The screen 15 includes an internally threaded surface 151, an inner wall surface 152, and a bottom surface 153. The bottom surface 153 mates with the regulator valve seat bottom surface 144 and the internally threaded surface threadably engages the plug body lower attachment structure 57.
The lower part of the fishing rod 1 is provided with an inner hexagonal hollow hole 104 and is matched with a regular hexagonal rod 81 of the valve rod, the fishing rod 101 is in clearance fit with an upper cover 201, a spring 4 is arranged between a circular truncated cone 102 and an inner top surface 203, and the bottom surface 103 of the circular truncated cone is contacted with an upper plane 61; an upper cover sealing ring is arranged at the position of the upper cover groove 202, and an upper cover threaded surface 204 is in threaded connection with the upper cavity surface 52 of the plug body; the plug main body cam groove surface 54 and the cam outer plane 63 are installed in parallel and have a gap, so that the cam can rotate, the central hole 62 is a pin hole, the cam is fixed on the plug main body by pins, namely 2 pins are adopted on two sides for installation, the pins do not pass through the cam center, the internal thread 55 is provided with threads which are in threaded connection with the adjusting nut outer thread surface 92, the lower end of the bottom surface 93 is provided with a main spring, the lower connecting structure 57 is in threaded connection with the filter screen internal thread surface 151, and the inner wall of the plug main body 5 is in clearance fit with the valve core sliding surface 124, so that the valve core can move up and down; the cylindrical rod 83 with the external thread of the valve rod is in threaded connection with the upper thread surface 131 of the adjustable valve, so that the adjustable valve can rotate along with the valve rod; the cylindrical rod 82 is in clearance fit with the central hole surface 122, so that the valve core can slide up and down by taking the rod as an axis; the filter screen bottom surface 153 is connected with the adjusting valve seat bottom surface 144, the adjusting valve outer thread surface 132 is in thread fit with the adjusting valve seat thread hole 141, so that the valve core can rotate along with the valve rod and move up and down, the thread turning direction of the valve core is opposite to the thread turning direction of the plug body and the adjusting nut, and the round table surface 143 is pressed by the lower end part of the plug body to be fixed in the lower cover.
When the plugging device is used, injected water enters the plugging device through the bottom hole of the valve seat through the filter screen and then is injected into the stratum through the regulating valve and the valve core. Because the valve core can reciprocate in the plug main body under the action of injection pressure or stratum pressure change and spring elasticity, balance is achieved, and constant-flow water injection can be finally realized. The invention mainly changes the flow entering the blanking plug and the elasticity of the spring by adjusting the opening of the adjustable valve and the initial compression amount of the main spring so as to realize constant flow when the pressure of the formation or the pressure of injected water changes, and is suitable for separated layer water injection oil extraction.
The valve core adopts a mode of discharging water from rectangular grooves on two sides to replace the former four-hole water discharging mode, the valve core can rotate in the plug main body when the plug works, and the rectangular water discharging grooves can enable the water injection flow to be more stable and improve the flow control precision; meanwhile, the adjusting nut is additionally arranged on the plug main body to adjust the initial compression amount of the spring, the adjustable range of the constant flow of the plug can be enlarged, the structure of the existing plug is matched with a certain stiffness spring, only small-range flow adjustment can be carried out, and meanwhile, the plug can realize constant flow under the action of the same stiffness spring in a large-flow adjusting range.
In conclusion, the pre-tightening adjustable constant-flow water injection blanking plug applied to oilfield separate-zone water injection can adjust the opening degree of the water injection nozzle and the initial compression amount of the main spring so as to constantly control the water injection flow, and can solve the problems of small flow adjusting range, low flow control precision and the like of the conventional adjustable constant-flow blanking plug.
Claims (1)
1. The utility model provides an adjustable constant current blanking plug of pretension formula, includes fishing rod (1), its characterized in that: the blanking plug further comprises an upper cover (2), an upper cover sealing ring (3), a spring (4), a blanking plug main body (5), a cam (6), a pin (7), a valve rod (8), an adjusting nut (9), a main sealing ring (10), a main spring (11), a valve core (12), an adjusting valve (13), an adjusting valve seat (14) and a filter screen (15);
the fishing rod (1) is provided with a cylindrical surface (101), a circular truncated cone (102), a circular truncated cone bottom surface (103) and a hexagon socket type hollow hole (104) formed in the lower part;
the blanking plug main body (5) is sequentially provided with an upper cavity surface (52), a pin hole (53), a cam groove surface (54), an internal thread (55), a water outlet (56) and a lower connecting structure (57), the internal thread (55) is in threaded connection with an adjusting nut (9), a pin penetrates through the pin hole (53) and a central hole (62) of a cam to be fixed, and the lower connecting structure (57) is in threaded connection with an internal thread surface (151) of a filter screen;
the middle part of the cam (6) is of a hollow structure and is provided with an upper plane (61), a central hole (62) and an outer plane (63), so that the valve rod (8) can penetrate through the cam without influencing the rotation of the cam when the cam is locked in a fishing way of the water injector, namely the rotation of the cam and the rotation of the valve rod do not influence each other;
the upper part of the valve rod (8) is provided with a regular hexagon rod (81) which is matched with an inner hexagon hole (104) of the fishing rod (1), and after the regular hexagon rod is matched with the inner hexagon hole, a certain gap exists at the top part so that the valve rod can slide up and down in the hole and can be fixed in the circumferential direction, namely can not rotate; the middle part of the valve rod is a cylindrical rod (82) which is in clearance fit with a central hole surface (122) of the valve core, and the lower part of the valve rod is a small section of cylindrical rod (83) provided with external threads and in threaded connection with a thread surface (131) on the regulating valve;
the adjusting nut (9) is a cylinder with a hollow inner part and is provided with a hollow hole (91) with a regular hexagonal prism, an external thread surface (92) and a bottom surface (93); the regular hexagonal prism hollow hole (91) is in clearance fit with a regular hexagonal rod (81) of the valve rod, so that the adjusting nut can rotate along with the valve rod and slide up and down, the external thread surface (92) is in threaded fit with the internal thread (55) of the plug body, so that the adjusting nut can move up and down along with the rotation, and the bottom surface (93) presses the main spring (11);
the valve core (12) is provided with a small cylindrical surface (121), a central hole surface (122), a boss surface (123), a sliding surface (124), a joint surface (125) and rectangular water outlet grooves (1201), two rectangular water outlet grooves (1201) symmetrical along a symmetrical surface (1202) are formed in two sides of the lower part of the boss surface (123), and the height of each rectangular water outlet groove is consistent with the diameter of a water outlet (56) of the blanking plug main body (5); the sliding surface (124) is in clearance fit with the inner surface of the water injection blanking plug main body (5) to enable the valve core to slide up and down, the central hole surface (122) is in clearance fit with the valve rod (8) to enable the valve core to move up and down and enable injected water to flow into an upper cavity formed by the blanking plug main body and the valve core through a clearance, and a main spring (11) is arranged between the boss surface (123) and the adjusting nut (9);
the regulating valve (13) is a cylinder and is provided with an upper thread surface (131), an external thread surface (132) and a bottom surface (133); a cylindrical thread groove is formed in the center of the upper end of the regulating valve (13), is matched with a cylindrical threaded rod at the tail of the valve rod (8) and can rotate along with the valve rod; the lower end of the regulating valve (13) is provided with a rectangular two-side through groove (1301) with a certain depth, the rectangular two-side through groove is concentric with the regulating valve, and the thread turning direction of the rectangular two-side through groove is opposite to that of the regulating nut;
the adjusting valve seat (14) is provided with a threaded hole (141), a small outer circular surface (142), a circular table surface (143) and a bottom surface (144); the exterior of the regulating valve seat (14) is a cylinder with two layers of steps, the lower end of the regulating valve seat is a cylindrical table with a round hole in the center, a hollow cylinder with steps is arranged above the round table surface (143), and an internal threaded hole (141) is formed in the regulating valve seat and matched with the external thread surface (132) of the regulating valve; the round table surface (143) is pressed by the lower end of the plug body during assembly to play a role in fixing;
the filter screen (15) has an internal thread surface (151), an inner wall surface (152), and a bottom surface (153); the bottom surface (153) is matched with the bottom surface (144) of the regulating valve seat, and the internal thread surface is in threaded connection with the lower connecting structure (57) of the plug body.
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| CN201910453241.4A CN110029974B (en) | 2019-05-28 | 2019-05-28 | Pre-tightening adjustable constant-current blanking plug |
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| CN112814634B (en) * | 2021-03-17 | 2021-11-09 | 大庆市天德忠石油科技有限公司 | Injection allocation device |
| CN114109328B (en) * | 2021-11-26 | 2023-06-16 | 西南石油大学 | Start-stop bipolar adjustable constant-current blanking plug |
| CN117536590B (en) * | 2023-12-07 | 2024-07-02 | 盐城市弘通石油机械有限公司 | Bridge type concentric water distributor |
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