CN110185423B - Precession type bipolar adjustable constant-current blanking plug - Google Patents
Precession type bipolar adjustable constant-current blanking plug Download PDFInfo
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- CN110185423B CN110185423B CN201910448590.7A CN201910448590A CN110185423B CN 110185423 B CN110185423 B CN 110185423B CN 201910448590 A CN201910448590 A CN 201910448590A CN 110185423 B CN110185423 B CN 110185423B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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 DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
Abstract
A precession type bipolar adjustable constant-current blanking plug. The adjustable constant-current blanking plug mainly aims at solving the problems that the flow adjusting range is small and the adjusting precision is difficult to control in the existing adjustable constant-current blanking plug. The method is characterized in that: the bipolar adjustable constant-current water injection blanking plug comprises a fishing rod, a sealing ring, an upper cover, a spring, a valve rod, a cam, a blanking plug main body, a dynamic seal, a main spring, a valve core, an adjusting valve seat, a gear column, a baffle and a filter screen; the injected water enters the water injector 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. The plug valve core can move back and forth under the action of the change of injection pressure or formation pressure and spring elasticity in the plug main body to achieve balance and finally realize constant-flow water injection.
Description
Technical Field
The invention relates to a downhole tool in the field of oil and gas field development, in particular to a precession type bipolar adjustable constant-current plug applied to oilfield separate layer water injection.
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 and fishing 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 precession type bipolar adjustable constant-current plug which changes the flow entering the plug and the stress on the top surface of a valve core through the opening of an adjusting valve and the area of the top surface of the valve core so as to realize constant flow when the pressure of the ground or the pressure of injected water changes, and is suitable for layered water injection oil extraction.
The technical scheme of the invention is as follows: the precession type bipolar 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 valve rod 7, a dynamic seal 8, a main body sealing ring 9, a main spring 10, a baffle plate 11, a gear column 12, a valve core 13, a lower rod 14, a regulating valve 15, a filter screen 16 and a regulating valve seat 17.
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 hollow hole 104 positioned at the lower part of the fishing rod; the upper part of the valve rod 7 is provided with a regular hexagon rod 71 which is matched with the inner hexagon hole 104 of the fishing rod 1, and after the regular hexagon rod is matched with the inner hexagon hole 104, a certain gap exists between the top of the valve rod 7 and the inner hexagon hole 104, so that the valve rod can slide up and down in the inner hexagon hole 104 and can be circumferentially fixed, namely can not rotate; the middle part of the valve rod 7 is cylindrical and is provided with a small section of external thread 72, and the lower part is provided with an eccentric cylindrical gear hollow hole 73.
The gear column 12 is a cylindrical gear column and can be meshed with the eccentric cylindrical gear holes on the valve rod 7 and the lower rod 14 for transmission at the same time, and the gear column can have a certain upward moving space in the eccentric cylindrical gear hole of the valve rod during meshing; the upper end of the lower rod 14 is the same as the lower end of the valve rod 7, and is provided with an eccentric cylindrical gear hole 141 which can be meshed with the gear column 12 to rotate, and the lower end is provided with a small section of small-diameter cylinder 143 provided with external threads and in threaded connection with the regulating valve 15.
The bottom of the baffle 11 is a semicircular circular plate 113, the upper part of the baffle 11 is a hollow cylinder 112 concentric with the original plate, the middle part of the hollow cylinder is provided with an inner gear pair 111 with the inner diameter larger than the diameter of the gear column, the inner gear pair is meshed with the gear column 12 to form an eccentric gear, the outer wall of the hollow cylinder is matched and centered with a central hole surface 132 of the valve core 13, so that the hollow cylinder can rotate around the center of the valve core and move up and down, when the baffle 11 is subjected to water injection pressure, the baffle 11 can be pressed on the top surface 133 of the valve core, and the baffle 11 can be driven to rotate by adjusting the fishing head so as to; meanwhile, the height of the hollow cylinder on the baffle plate 11 needs to be larger than the diameter of the water outlet hole on the main body, so that the baffle plate 11 cannot fall off from the valve core when not under the pressure of injected water.
The cam 6 is a hollow structure, namely the middle part of the cam is 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 7 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 valve rod is not influenced by each other.
The stopper 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 middle groove 56, a lower dynamic seal 57, a water outlet hole 58, a lower connecting structure 59 and a sliding groove 60, wherein the internal thread 55 is matched with an external thread 72 in the middle of the valve rod to rotate, and the middle groove 56 is positioned between the thread and the dynamic seal so as to prevent the thread from reaching the dynamic seal to damage the seal when the valve rod rotates and moves downwards; four round water outlet holes 58 which are right-angled are arranged below the dynamic seal 57 at a certain distance; the sliding groove is in clearance fit with the sliding edge 135, so that the valve core can slide up and down in the main body but cannot rotate.
The valve core 13 is provided with a small cylindrical surface 131, a central hole surface 132, an inner top surface 133, a lower groove surface 134, a sliding edge 135 and a rectangular water outlet groove; the lower part of the inner top surface 133 is provided with two rectangular water outlet grooves with two symmetrical sides, and the height of the water outlet grooves is consistent with the diameter of the water outlet hole 58 of the plug main body 5; an arc-shaped through hole 1301 with an angle of 60 degrees is formed on the two cylindrical joint surfaces in the middle of the valve core, and a through hole is formed between the arc-shaped through hole and the lower part of the arc-shaped through hole; the valve core 13 is in clearance fit with the water injection plug main body 5, and the central hole surface 132 is in clearance fit with the valve rod 7, so that the valve core can move up and down, and injected water can flow into an upper cavity formed by the water injector main body and the valve core through a clearance.
The regulator valve 15 has an upper threaded surface 151, an external threaded surface 153, and a bottom surface 152. A cylindrical thread groove is formed in the center of the upper end of the adjusting valve 15, is matched with a cylindrical threaded rod at the tail of the lower rod 14 and can rotate along with the valve rod; the lower end of the regulating valve 15 is provided with a rectangular two-side through groove 1501 with a certain depth, and the rectangular two-side through groove is concentric with the regulating valve.
The regulating valve seat 17 has a threaded hole 171, a small outer circular surface 172, a circular table surface 173 and a bottom surface 174; the outer part of the adjusting valve seat 17 is a cylinder with two layers of steps, the lower end of the adjusting valve seat 17 is a cylindrical table with a round hole in the center, a hollow cylinder with steps is arranged above the round table 173, and an internal threaded hole 171 formed in the adjusting valve seat 17 is matched with the adjusting valve 15; the circular table 173 is pressed by the lower end of the plug body during assembly to play a role in fixing.
The invention has the following beneficial effects:
the constant flow principle of the existing 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 same spring after being stressed, and constant flow can not be realized any more.
The injected water of the constant-flow blanking plug enters the blanking plug through the bottom hole of the regulating 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 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 baffle plate so as to control the flow entering the blanking plug and the area of the top surface of the valve core, and adjustable constant-flow water injection is realized. The constant-current blanking plug adopts the adjustable rectangular valve to replace the former fixed water nozzle, the opening of the regulating valve can be changed underground, meanwhile, the area of the top surface of the valve core is changed to change the pressure borne by the valve core, so that the valve core can be balanced with the same spring under different water injection rates (the meshing ratio between the gear column and the baffle and the thread pitch between the regulating valve and the valve seat can be changed), the change of the rectangular valve is linear, the research and calculation are easy, the operation is simple, the cost is saved, the underground adjustable constant-current water injection is realized, and the petroleum recovery ratio is 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 structure diagram of the gear lever cooperation and regulating valve cooperation relationship of the present invention
FIG. 5 is a three-dimensional structural part diagram of the fishing rod of the present invention
FIG. 6 is a drawing showing the three-dimensional structure of the upper cover of the present invention
FIG. 7 is a drawing of a three-dimensional structural part of the plug body of the present invention
FIG. 8 is a three-dimensional structural part diagram of the valve rod of the present invention
FIG. 9 is a three-dimensional structural part view of the valve core of the present invention
FIG. 10 is a three-dimensional structural part diagram of a gear column of the present invention
FIG. 11 is a drawing of a dynamic seal three-dimensional structural part of the present invention
FIG. 12 is a drawing of a three-dimensional structural detail of the pin of the present invention
FIG. 13 is a drawing of a lower beam three-dimensional structural part of the present invention
FIG. 14 is a three-dimensional structural part diagram of a regulating valve of the invention
FIG. 15 is a drawing of a main spring three-dimensional structure part of the present invention
FIG. 16 is a drawing showing a three-dimensional structural part of a spring according to the present invention
FIG. 17 is a drawing of a three-dimensional structural part of the baffle of the present invention
FIG. 18 is a drawing of a three-dimensional structural part of the screen of the present invention
FIG. 19 is a three-dimensional structural drawing of an adjusting valve seat according to the present invention
FIG. 20 is a drawing of a cam three-dimensional structural part 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-valve rod, 8-dynamic seal, 9-main body sealing ring, 10-main spring, 11-baffle, 12-gear column, 13-valve core, 14-lower rod, 15-regulating valve, 16-filter screen and 17-regulating valve seat.
The specific implementation mode is as follows:
the constant-flow water injection blanking plug comprises a fishing rod, an upper cover sealing ring, an upper cover, a spring, a valve rod, a cam, a blanking plug main body, a main sealing ring, a dynamic seal, a lower rod, a main spring, a valve core, an adjusting valve seat, a gear column, a baffle and a filter screen. The lower part of the fishing rod is provided with a hexagon socket type hollow hole. The upper part of the valve rod is a regular hexagon rod, an inner hexagon hole at the lower end of the fishing rod is matched, and a certain gap exists at the top after the matching, so that the valve rod can slide up and down in the hole and can not rotate after being fixed in the circumferential direction; the middle part of the valve rod is cylindrical and is provided with a small section of external thread, and the lower part of the valve rod is provided with an eccentric cylindrical gear hole with a certain depth. The gear column is a cylindrical gear column. Can be simultaneously engaged with the valve rod and the eccentric cylindrical gear hole on the lower rod for transmission, and a gear column in the eccentric cylindrical gear hole of the valve rod can have a certain space for moving up and down during engagement. The lower rod upper end is the same with the lower extreme of valve rod, has seted up eccentric cylindrical gear hole, can rotate with the gear post meshing, and the lower extreme has the path cylinder that the external screw thread was seted up to a segment, with governing valve threaded connection. The baffle bottom is a semicircle plectane, and upper portion is the hollow cylinder with the former board is concentric, and hollow cylinder is inside to be offered internal gear pair (the internal diameter is greater than the gear post diameter), forms eccentric gear engagement with the gear post, and cylindrical outer wall and the upper portion hollow hole cooperation centering of case enable it to rotate around the case center and reciprocate. When the baffle is subjected to water injection pressure, the baffle can be pressed on the top surface of the valve core (the pressure on the baffle also acts on the valve core), and the fishing head is adjusted to drive the baffle to rotate so as to adjust the stress area of the valve core to change the stress; meanwhile, the height of the cylinder on the baffle plate is larger than the diameter of the water outlet hole on the main body, so that the baffle plate cannot fall off from the valve core when not pressurized by injected water. The cam is hollow structure, namely the middle part of the cam is hollow structure, so that the valve rod can penetrate through the cam without influencing the rotation of the cam when the cam is locked in the water injector in a fishing way, namely the rotation of the cam and the rotation of the valve rod do not influence each other.
The lower part of a cam cavity of the plug main body is sequentially provided with an internal thread, a middle groove and a lower dynamic seal, the internal thread is matched with the external thread in the middle of the valve rod and can rotate, the middle groove is positioned between the thread and the dynamic seal, and the main function is to prevent the thread from reaching the dynamic seal to damage the seal when the valve rod rotates and moves downwards; and four circular water outlet holes which are mutually right-angled are arranged at a certain distance below the dynamic seal, the slide way in the dynamic seal is in clearance fit with the slide arris on the outer surface of the valve core, so that the valve core can slide up and down along the slide way and can not rotate, the position of the valve core is fixed when the valve rod is adjusted, and the area of the top surface of the valve core is adjustable.
The valve core is formed by combining two hollow cylinders with different diameters, the small-diameter cylinder is positioned at the upper end, the top of the large cylinder at the lower end is provided with two rectangular water outlet grooves which are symmetrical at two sides, and the height of each water outlet groove is consistent with the diameter of the water outlet of the plug main body. The two cylindrical joint surfaces in the middle of the valve core are provided with arc-shaped through holes with the angle of 60 degrees, and through holes are formed between the arc-shaped through holes and the lower part of the arc-shaped through holes. The valve core is in clearance fit with the water injection plug main body, and the central through hole is in clearance fit with the valve rod, so that the valve core can move up and down, and injected water can flow into an upper cavity formed by the water injector main body and the valve core through the clearance.
The regulating valve is a cylinder with external threads on the outer surface, and a cylindrical thread groove is formed in the center of the upper end of the regulating valve, is matched with a cylindrical threaded rod at the tail of the lower rod and can rotate along with the valve rod; the lower end is provided with a rectangular through groove with a certain depth on two sides, and the rectangular groove is concentric with the regulating valve.
The adjusting valve seat is a cylinder with 2 layers of steps on the outer part, the lower end is a cylindrical table with a circular hole in the center, a hollow cylinder with steps is arranged on the circular table, and internal threads are arranged in the hollow cylinder and matched with the adjusting valve. The bottommost round platform is pressed by the lower end of the plug body during assembly, and the fixing effect is achieved.
Fishing rod and upper cover clearance fit, upper cover and filter screen all with blanking plug main part threaded connection, the cam passes through the pin and fixes its card fixed effect on the blanking plug main part, the valve rod passes the cam from the center, valve rod upper portion is connected with fishing rod, valve rod lower extreme eccentric gear hole and gear post meshing, gear post and the eccentric meshing of baffle that is arranged in the case, gear post lower extreme and the eccentric hole meshing at lower extreme top, lower pole and governing valve threaded connection, the case is installed in blanking plug main part lower chamber and rather than clearance fit, governing valve and disk seat threaded connection, the case lower extreme is arranged in on the regulation disk seat, the disk seat is fixed in the filter screen by the blanking plug main part.
The structure of the blanking plug mainly adopts the relation matching of the adjustable top surface area of the valve core and the opening degree of the adjustable valve, enhances the reliability of the adjustable constant flow by singly adjusting the size of the water inlet of the original adjustable constant flow blanking plug, adopts the rectangular adjustable valve to replace the cone valve of the original structure, enables the flow regulation to be easier to control, and can realize the constant flow within the large flow range under the same spring condition.
The structure of the blanking plug is compared with that of the blanking plug in the prior art as follows: the rectangular regulating valve is adopted to replace the prior cone valve structure, and meanwhile, the outer surface of the valve core and the inside of the main body are respectively provided with a sliding edge and a slideway to circumferentially fix the valve core, so that the adjustable valve and the top surface area can be conveniently regulated; the top surface of the valve core is provided with the groove, and the eccentric gear column and the baffle plate structure are added, so that the top surface area of the valve core can be conveniently adjusted, and the valve core can be balanced with a spring with the same rigidity under different flow rates to realize constant flow. The device for constantly controlling the water injection flow can adjust the opening degree of the water injection nozzle and the area of the top surface of the valve element, and can solve the problems that the prior adjustable constant-current blanking plug has small flow regulation range and difficult control of regulation precision due to the small constant flow range of the same spring and the difficulty in calculation and control of the opening degree of the cone valve, and the poor linearity of the opening degree change.
The invention will be further described with reference to the accompanying drawings in which:
referring to fig. 1 to 2, the structural diagram of the present invention is shown, and it can be seen that the present invention includes a fishing rod 1, an upper cover 2, an upper cover sealing ring 3, a spring 4, a plug body 5, a cam 6, a valve rod 7, a dynamic seal 8, a body sealing ring 9, a main spring 10, a baffle 11, a gear column 12, a valve core 13, a lower rod 14, a regulating valve 15, a filter screen 16 and a regulating valve seat 17.
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 thereof. The upper part of the valve rod 7 is provided with a regular hexagon rod 71 which is matched 104 with an inner hexagon hole of the fishing rod 1, and after the matching, the top part has a certain gap which can lead the valve rod to slide up and down in the hole and be fixed in the circumferential direction, namely can not rotate; the middle part of the valve rod is cylindrical and is provided with a small section of external thread 72, and the lower part of the valve rod is provided with an eccentric cylindrical gear hole 73 with a certain depth.
The gear post 12 is a cylindrical gear post. Can be simultaneously meshed with the eccentric cylindrical gear holes on the valve rod 7 and the lower rod 14 for transmission, and the gear column in the eccentric hole of the valve rod can have a certain upward moving space during meshing. The upper end of the lower rod 14 is the same as the lower end of the valve rod 7, and is provided with an eccentric cylindrical gear hole 141 which can be meshed with the gear column 12 to rotate, and the lower end is provided with a small section of small-diameter cylinder 143 provided with external threads and in threaded connection with the regulating valve 15. The bottom of the baffle 11 is a semicircular round plate 113, the upper part is a hollow cylinder 112 concentric with the original plate, the middle part of the hollow cylinder is provided with an internal gear pair 111 with the inner diameter larger than the diameter of the gear column, the internal gear pair is meshed with the gear column 12 to form an eccentric gear, and the outer wall of the cylinder is matched and centered with a central hole surface 132 of the valve core 13, so that the valve core can rotate around the center of the valve core and move up and down. When the baffle is subjected to water injection pressure, the pressure applied to the baffle also acts on the valve core, the baffle can be pressed on the top surface 133 of the valve core, and the fishing head can be adjusted to drive the baffle to rotate so as to adjust the stress area of the valve core to change the stress; meanwhile, the height of the cylinder on the baffle plate is larger than the diameter of the water outlet hole on the main body, so that the baffle plate cannot fall off from the valve core when not pressurized by injected water.
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 7 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 valve rod does not influence each other.
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 middle groove 56, a lower dynamic seal 57, a water outlet hole 58, a lower connecting structure 59 and a slideway 60, wherein the internal thread 55 is matched with an external thread 72 in the middle of the valve rod to rotate, the middle groove 56 is positioned between the thread and the dynamic seal, and the main function is to prevent the thread from reaching the dynamic seal to damage the seal when the valve rod rotates and moves downwards; four round water outlet holes 58 which are right-angled are arranged below the dynamic seal 57 at a certain distance; the slide 60 is in clearance fit with the slide edge 135 so that the spool can slide up and down along the slide but cannot rotate.
The valve core 13 is composed of a small cylindrical surface 131, a central hole surface 132, an inner top surface 133, a lower groove surface 134, a sliding edge 135 and a rectangular water outlet groove. The plug is formed by combining two hollow cylinders with different diameters, wherein the small-diameter cylinder is arranged at the upper end, two rectangular water outlet grooves with symmetrical sides are formed in the lower portion of the inner fixed surface 133, and the height of each water outlet groove is consistent with the diameter of a water outlet hole 58 of the plug main body 5. An arc-shaped through hole 1301 with an angle of 60 degrees is formed on the two cylindrical joint surfaces in the middle of the valve core, and a through hole is formed between the arc-shaped through hole and the lower part of the arc-shaped through hole. The valve core 13 is in clearance fit with the water injection plug main body 5, and the central hole surface 132 is in clearance fit with the valve rod 7, so that the valve core can move up and down, and injected water can flow into an upper cavity formed by the water injector main body and the valve core through the clearance.
The regulating valve 15 is composed of an upper thread surface 151, an external thread surface 153 and a bottom surface 152, and is a cylinder with an external thread 153 on the outer surface, and a cylindrical thread groove is arranged at the center of the upper end and matched with a cylindrical threaded rod at the tail part of the lower rod 14 and can rotate along with the valve rod; the lower end is provided with a rectangular through groove 1501 at two sides of which the depth is a certain degree, and the rectangular groove is concentric with the regulating valve.
The regulator valve seat 17 is formed by a threaded hole 171, a small outer circular surface 172, a circular table surface 173, and a bottom surface 174. The outer part is provided with a cylinder with 2 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 173, and the inner part is provided with an internal thread hole 171 matched with the adjusting valve 15. The circular table 173 is pressed by the lower end of the plug body during assembly to play a role in fixing.
The lower part of the fishing rod 1 is provided with a hexagon socket type hollow hole 104 which is matched with the valve rod 71, the fishing rod 101 is in clearance fit with the upper cover 201, a spring 4 is arranged between the circular truncated cone 102 and the bottom surface 103 of the circular truncated cone, and the bottom surface 103 of the circular truncated cone is contacted with the upper plane 61; an upper cover sealing ring is arranged at the position of an upper cover 202, and 204 is in threaded connection with the blanking plug main body 52; the blanking plug main body 54 and the cam 63 are installed in parallel with a gap to enable the cam to rotate, the first pin hole 53 and the second pin hole 62 are used for fixing the cam on the blanking plug main body through pins, namely 2 pins are installed on two sides, the pins do not penetrate through the center of the cam, threads are arranged at the position of an internal thread 55 to be in threaded connection with the valve rod 72, a smooth circular pipe section is arranged at the position 56 below the threaded connection to play an excessive role and prevent the thread section from rotating downwards to damage sealing, the position of a lower movable sealing 57 is a movable sealing, a main spring is installed between the position below the lower movable sealing 57 and a boss of the valve core 1, the small circular cylindrical surface 131 is used as an axis, the water outlet 58 is in clearance fit with the outer wall of the valve core to enable the valve core to move upwards and downwards, and the lower; the valve rod 73 is engaged with the gear post 12, and the gear post is engaged with the cylindrical eccentric gear hole 141 at the same time, so that the gear post can rotate and move up and down therebetween; the outer surface 142 of the lower rod is in clearance fit with the baffle hollow hole 132, so that the valve core can slide up and down by taking the rod as a shaft, and the external thread cylinder 143 of the lower rod is in threaded connection with the upper thread surface 151 of the regulating valve; the valve core inner fixed surface 133 and the semicircular circular plate 113 of the baffle are pressed together to block the arc-shaped hole 1301 of the valve core after the baffle is subjected to fluid pressure, and the lower groove surface 134 is installed in contact with the small outer circular surface 172; the bottom surface 152 is in threaded connection with the threaded hole 171, so that the regulating valve 15 can rotate along with the lower rod and simultaneously move upwards; the baffle 111 is eccentrically engaged with the gear column, the diameter of the gear column is smaller than the aperture of the baffle, and the hollow cylinder 112 is in clearance fit with the central hole surface 132, so that the baffle 11 can slide and rotate up and down; the screen plane 163 is connected to the bottom surface 174, and the circular table 173 is pressed by the lower end of the stopper 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 adjusting valve seat through the filter screen and then is injected into the stratum through 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 baffle plate so as to control the flow entering the blanking plug and the area of the top surface of the valve core, and adjustable constant-flow water injection is realized.
Claims (1)
1. The utility model provides a precession formula bipolar adjustable constant current blanking plug, 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 valve rod (7), a dynamic seal (8), a main body sealing ring (9), a main spring (10), a baffle plate (11), a gear column (12), a valve core (13), a lower rod (14), an adjusting valve (15), a filter screen (16) and an adjusting valve seat (17);
the fishing rod (1) is provided with a cylindrical surface (101), a circular truncated cone (102), a circular truncated cone bottom surface (103) and an inner hexagonal hollow hole (104) positioned at the lower part of the fishing rod; the upper part of the valve rod (7) is provided with a regular hexagon rod (71) which is matched with the inner hexagon hole (104) of the fishing rod (1), and after the regular hexagon rod (71) is matched with the inner hexagon hole (104), a certain gap exists between the top of the valve rod (7) and the inner hexagon hole (104) so that the valve rod can slide up and down in the inner hexagon hole (104) and can not rotate when being fixed in the circumferential direction; the middle part of the valve rod (7) is cylindrical and is provided with a small section of external thread (72), and the lower part of the valve rod is provided with an eccentric cylindrical gear empty hole (73);
the gear column (12) is a cylindrical gear column, can be meshed with the eccentric cylindrical gear holes on the valve rod (7) and the lower rod (14) for transmission at the same time, and can have a certain upward moving space in the eccentric cylindrical gear holes of the valve rod during meshing; the upper end of the lower rod (14) is the same as the lower end of the valve rod (7), an eccentric cylindrical gear hole (141) is formed and can be meshed with the gear column (12) to rotate, and a small section of small-diameter cylinder (143) with external threads is arranged at the lower end and is in threaded connection with the regulating valve (15);
the bottom of the baffle (11) is a semicircular round plate (113), the upper part of the baffle is a hollow cylinder (112) concentric with the original plate, the middle part of the hollow cylinder is provided with an internal gear pair (111) with the inner diameter larger than the diameter of the gear column, the internal gear pair is meshed with the gear column (12) to form an eccentric gear, the outer wall of the hollow cylinder is matched and centered with a central hole surface (132) of the valve core (13), so that the hollow cylinder can rotate around the center of the valve core and move up and down, when the baffle (11) is subjected to water injection pressure, the baffle (11) can be pressed on the top surface (133) of the valve core, and the baffle (11) can be driven to rotate by adjusting the fishing head so as to; meanwhile, the height of the hollow cylinder on the baffle (11) is required to be larger than the diameter of the water outlet hole on the main body, so that the baffle (11) cannot fall off from the valve core when not under the pressure of injected water;
the cam (6) is of a hollow structure, namely the middle part of the cam 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 (7) 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 rotation of the valve rod are not influenced;
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 middle groove (56), a lower movable seal (57), a water outlet hole (58), a lower connecting structure (59) and a sliding groove (60), wherein the internal thread (55) is matched with an external thread (72) in the middle of the valve rod to rotate, and the middle groove (56) is positioned between the thread and the movable seal so as to prevent the thread from reaching the movable seal to damage the seal when the valve rod rotates and moves downwards; four round water outlet holes (58) which are mutually at right angles are formed below the dynamic seal (57) at a certain distance; the sliding groove is in clearance fit with the sliding edge (135) so that the valve core can slide up and down in the main body but cannot rotate;
the valve core (13) is provided with a small cylindrical surface (131), a central hole surface (132), an inner top surface (133), a lower groove surface (134), a sliding edge (135) and a rectangular water outlet groove; the lower part of the inner top surface (133) is provided with two rectangular water outlet grooves with two symmetrical sides, and the height of the water outlet grooves is consistent with the diameter of a water outlet hole (58) of the plug main body (5); an arc-shaped through hole (1301) with an angle of 60 degrees is formed on the two cylindrical joint surfaces in the middle of the valve core, and a through hole is formed between the arc-shaped through hole and the lower part of the arc-shaped through hole; the valve core (13) is in clearance fit with the water injection plug main body (5), and the central hole surface (132) is in clearance fit with the valve rod (7) so as to realize that the valve core can move up and down and injected water can flow into an upper cavity formed by the water injector main body and the valve core through a clearance;
the regulating valve (15) is provided with an upper thread surface (151), an external thread surface (153) and a bottom surface (152); a cylindrical thread groove is formed in the center of the upper end of the adjusting valve (15), is matched with a cylindrical threaded rod at the tail of the lower rod (14) and can rotate along with the valve rod; the lower end of the regulating valve (15) is provided with a rectangular two-side through groove (1501) with a certain depth, and the rectangular two-side through groove is concentric with the regulating valve;
the adjusting valve seat (17) is provided with a threaded hole (171), a small outer circular surface (172), a circular table surface (173) and a bottom surface (174); the outer part of the adjusting valve seat (17) is a cylinder with two layers of steps, the lower end of the adjusting valve seat (17) is a cylindrical table with a round hole in the center, a hollow cylinder with steps is arranged above the cylindrical table (173), and an internal threaded hole (171) formed in the adjusting valve seat (17) is matched with the adjusting valve (15); the round table surface (173) is pressed by the lower end of the plug body during assembly to play a role in fixing.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910448590.7A CN110185423B (en) | 2019-05-28 | 2019-05-28 | Precession type bipolar adjustable constant-current blanking plug |
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| CN201910448590.7A CN110185423B (en) | 2019-05-28 | 2019-05-28 | Precession type bipolar adjustable constant-current blanking plug |
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| CN110185423B true CN110185423B (en) | 2021-07-02 |
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| CN114109328B (en) * | 2021-11-26 | 2023-06-16 | 西南石油大学 | Start-stop bipolar adjustable constant-current blanking plug |
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|---|---|---|---|---|
| US5842521A (en) * | 1997-01-29 | 1998-12-01 | Baker Hughes Incorporated | Downhole pressure relief valve for well pump |
| CN105275439A (en) * | 2015-10-26 | 2016-01-27 | 中国石油天然气股份有限公司 | Water injection well operation hanging type water distributor blowout prevention blockage device |
| WO2016024210A2 (en) * | 2014-08-09 | 2016-02-18 | Representaciones Y Servicios De Petroleos, Serinpet Limitada. | Anti-gas-lock check valve |
| CN108590606A (en) * | 2018-05-25 | 2018-09-28 | 东北石油大学 | A kind of adjustable constant-current water injection blanking plug |
| CN109252835A (en) * | 2017-07-14 | 2019-01-22 | 中国石油化工股份有限公司 | Jet stream constant flow blanking plug |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10100829B2 (en) * | 2015-07-28 | 2018-10-16 | Michael Brent Ford | Dump valve assembly with spring and method therefor |
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2019
- 2019-05-28 CN CN201910448590.7A patent/CN110185423B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5842521A (en) * | 1997-01-29 | 1998-12-01 | Baker Hughes Incorporated | Downhole pressure relief valve for well pump |
| WO2016024210A2 (en) * | 2014-08-09 | 2016-02-18 | Representaciones Y Servicios De Petroleos, Serinpet Limitada. | Anti-gas-lock check valve |
| CN105275439A (en) * | 2015-10-26 | 2016-01-27 | 中国石油天然气股份有限公司 | Water injection well operation hanging type water distributor blowout prevention blockage device |
| CN109252835A (en) * | 2017-07-14 | 2019-01-22 | 中国石油化工股份有限公司 | Jet stream constant flow blanking plug |
| CN108590606A (en) * | 2018-05-25 | 2018-09-28 | 东北石油大学 | A kind of adjustable constant-current water injection blanking plug |
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