CN113107443A - Eccentric oilfield water distributor - Google Patents
Eccentric oilfield water distributor Download PDFInfo
- Publication number
- CN113107443A CN113107443A CN202110470848.0A CN202110470848A CN113107443A CN 113107443 A CN113107443 A CN 113107443A CN 202110470848 A CN202110470848 A CN 202110470848A CN 113107443 A CN113107443 A CN 113107443A
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- valve core
- hole
- ring
- push rod
- pressure
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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
-
- 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
Abstract
An eccentric oilfield water distributor relates to the technical field of oilfield downhole tools and comprises an upper connector, a valve core seat, an upper outer sleeve, an upper central pipe and a valve core, wherein the upper end and the lower end of the upper outer sleeve are respectively and fixedly connected to the outer sides of the upper connector and the valve core seat, and the upper end and the lower end of the upper central pipe are respectively and hermetically connected to the inner sides of the upper connector and the valve core seat; an annular space is reserved between the upper outer sleeve and the upper central pipe, an axial valve core mounting hole is processed in the valve core seat, the valve core mounting hole comprises three different hole diameter sections which are respectively called a large diameter section, a medium diameter section and a small diameter section according to the size relation of the hole diameter, the three sections are sequentially arranged from top to bottom, a valve core push rod is inserted in the valve core mounting hole in a sliding mode, a large diameter piston and a small diameter piston are arranged on the valve core push rod, the large diameter piston is sealed in the large diameter section in a sliding mode, and the small diameter piston is sealed in the medium diameter section in a sliding mode. The invention provides a mechanical eccentric water distributor for an oil field, which can adjust the injection amount without replacing a water nozzle of a blanking plug.
Description
Technical Field
The invention belongs to the technical field of oilfield downhole tools, and particularly relates to an eccentric oilfield water distributor.
Background
The water injection and oil displacement is the main method for oil extraction in various domestic large oil fields, the water distributor is the main tool for water injection and oil displacement, and the water distributor has the function of adjusting the injection amount of polymers in various reservoirs so as to better achieve the purpose of increasing the yield. Traditional water injection mandrel includes casing and the eccentric blanking plug of cartridge in the casing, and the back of finishing the installation, need take out the blanking plug in the casing through the operation mode in the pit, reaches the purpose of adjustment injection volume through the mode of changing water injection well choke in the blanking plug, and this kind of adjustment mode often takes place to throw and drag for the ware card extremely implementing, and it is lower to throw and drag for the success rate, seriously influences the operating efficiency.
In addition, when the electric control water distributor is used, a cable on the ground is connected with the underground water distributor through the cable, and the opening degree of the water nozzle is adjusted to a proper value through the motor to realize the accurate adjustment of the injection amount, so the technical problem of fishing is avoided by the electric control water distributor. However, electrically controlled water distributors have significant drawbacks: the electric part in the water distributor needs to be completely arranged in a closed, dry and waterproof space, so that the sealing performance requirement on the sealing structure in the water distributor is high, in addition, the high temperature in the underground has high requirement on the high temperature resistance of the electric elements in the water distributor, and a plurality of circuit elements are easy to damage at high temperature. Therefore, the stability of an electric control system of the electric control water distributor is poor.
Therefore, there is a need for a water distributor that does not use electrical controls and does not require fishing.
Disclosure of Invention
In order to solve the problems in the background art, the invention provides the mechanical eccentric water distributor for the oil field, and the injection amount is adjusted without replacing a water nozzle of a blanking plug.
The technical scheme provided by the invention is as follows: an eccentric oilfield water distributor comprises an upper connector, a valve core seat, an upper outer sleeve, an upper central pipe and a valve core, wherein the upper end and the lower end of the upper outer sleeve are respectively and fixedly connected with the outer sides of the upper connector and the valve core seat, and the upper end and the lower end of the upper central pipe are respectively and hermetically connected with the inner sides of the upper connector and the valve core seat; an annular space is reserved between the upper outer sleeve and the upper central pipe, an axial valve core mounting hole is processed in the valve core seat, the valve core mounting hole comprises three different hole diameter sections which are respectively called a large diameter section, a medium diameter section and a small diameter section according to the hole diameter size relationship, the three sections are sequentially arranged from top to bottom, a valve core push rod is inserted in the valve core mounting hole in a sliding mode, a large diameter piston and a small diameter piston are arranged on the valve core push rod, the large diameter piston is sealed in the large diameter section in a sliding mode, the small diameter piston is sealed in the medium diameter section in a sliding mode, the valve core is sealed in the small diameter section in a sliding mode, a liquid inlet hole and a liquid outlet hole for liquid passing are correspondingly formed in the side face of the valve core seat and the valve core, and the valve; the end part of the large-diameter section is in threaded connection with a plugging ring, the upper end of a valve core push rod penetrates through the center of the plugging ring and is in sliding sealing fit with the plugging ring, a pressure transfer hole A which feeds liquid into the large-diameter section and pushes the large-diameter piston to move downwards is formed in the inner side of a valve core seat between the plugging ring and the large-diameter piston, a spacer ring is arranged in the middle-diameter section in a sliding sealing manner, the lower end of the valve core push rod penetrates through the center of the spacer ring and is in sliding sealing fit with the spacer ring, a pressure transfer hole B which feeds liquid into the middle-diameter section and pushes the small-diameter piston to move upwards is arranged in the inner side of the valve core seat between the spacer ring and the small-diameter piston, a release sleeve carrier is inserted in the annular space, an axial mounting hole is formed in the release sleeve carrier, a release sleeve is inserted in the mounting hole, the upper end of the valve core push rod extends into the release sleeve, an adjusting ring, under the action of the elasticity of the spring A, the stress ring has a trend of being far away from the adjusting ring, the upper end of the adjusting ring is provided with elastic claws and ejector blocks at intervals along the circumferential direction, the upper part of the corresponding valve core push rod is provided with horse teeth matched with the elastic claws, when the stress ring is abutted against the upper connector, the distance between the horse teeth and the elastic claws is L, the spring A is abutted against the ejector blocks, the outer side of each elastic claw is fixedly connected with an inclined block, and the outer side of the lower end of the corresponding unlocking sleeve is provided with a conical surface for unlocking the elastic claws; the outer side of the adjusting ring is processed with a trapezoidal groove, the side wall of the upper outer sleeve is processed with a bayonet lock mounting hole, a disc spring and a bayonet lock are arranged in the bayonet lock mounting hole, the part of the bayonet lock extends out of the bayonet lock mounting hole under the elastic action of the disc spring, the extending part is trapezoidal, in the ascending process of the adjusting ring, the bayonet lock is firstly clamped into the trapezoidal groove of the adjusting ring, then an inclined block at the outer side of the elastic claw is in contact with the releasing sleeve, and the elastic claw is released from the releasing sleeve under the expansion force;
a guide slideway is processed on the outer wall of a valve core push rod between the large-diameter piston and the small-diameter piston, a guide pin is fixedly connected to the corresponding side wall of the valve core seat, the valve core push rod moves up and down to complete the switching of the guide pin in the guide slideway, and the guide slideway comprises a valve opening slideway, a large injection allocation quantity slideway, a middle injection allocation quantity slideway, a small injection allocation quantity slideway and a valve closing slideway; the length of the valve opening slide way is smaller than that of the valve closing slide way, and the length value of L is positioned between the valve opening slide way and the valve closing slide way; and a hole blocking pressure relief device for blocking the pressure transfer hole A or the pressure transfer hole B is arranged in the central channel in the valve core seat.
The further technical scheme is as follows: the hole-plugging pressure relief device comprises a main cylinder body, wherein a bulge ring is arranged in the middle of the main cylinder body, sealing rubber cylinders are arranged on two sides of the bulge ring, limiting rings for limiting the sealing rubber cylinders are fixedly arranged at two ends of the main cylinder body, communication holes for communicating the inner cavities of the two sealing rubber cylinders are axially processed on the bulge ring, a pressure inlet blind hole and a pressure relief blind hole are axially processed on the main cylinder body, the pressure inlet blind hole and the pressure relief blind hole are radially communicated, a pressure relief hole for externally feeding liquid to the pressure inlet blind hole is radially processed on the bulge ring, a rubber cylinder liquid inlet hole for communicating the pressure inlet blind hole with the inner cavity of the lower sealing rubber cylinder is processed on the side wall of the main cylinder body at the lower part of the pressure inlet blind hole, a core plug and a spring B are arranged in the pressure inlet blind hole, the spring B is positioned below the core plug and has a tendency of being positioned at the upper end of the pressure inlet blind hole, the upper portion of the core plug is provided with a concave ring, the core plug moves downwards to the position where the pressure relief hole is aligned with the concave ring, and then the pressure inlet blind hole and the pressure relief blind hole are communicated in the radial direction to be opened, so that the pressure relief hole is communicated with the pressure relief blind hole.
The further technical scheme is as follows: the lower end of the main cylinder body is provided with a counterweight guide head.
The further technical scheme is as follows: the trapezoidal two waists of bayonet lock tip unequal, wherein the waist inclination of upside is big, the inclination of downside waist is little to make the adjustable ring go upward thrust that the bayonet lock needs little, the thrust that the bayonet lock needs is big through down.
The invention has the beneficial effects that: compared with the traditional mechanical water distributor which needs to salvage the blanking plug to replace the water nozzle for adjusting the injection amount, the invention can adjust the injection amount without salvaging the water nozzle; compared with the emerging electric control water distributor, the invention does not need to be provided with an electric control element underground, so the manufacturing difficulty is reduced, and the safety is higher; therefore, the invention improves the defects of the mechanical water distributor and the electric control water distributor at the same time, and has the characteristics of safety, reliability and convenient operation.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
Fig. 2 is a partial enlarged view at I in fig. 1.
Fig. 3 is a schematic view of a portion of the structure of fig. 2.
Fig. 4 is a view from a-a in fig. 3.
Fig. 5 is a schematic view of a portion of the structure of fig. 2.
Fig. 6 is an expanded view of the guide ramps on the outside of the poppet push rod.
Fig. 7 is a schematic structural diagram of the hole plugging pressure relief device of the present invention.
Fig. 8 is a view from the direction of B-B in fig. 7.
In the figure: 1. an upper joint; 2. putting an outer sleeve; 3. releasing the ferrule carrier; 4. releasing the card sleeve; 5. plugging a ring; 6. a large diameter section; 7. a large diameter piston; 8. a valve core seat; 9. a small diameter piston; 10. a medium diameter section; 12. a valve core; 13. a small diameter section; 14. a liquid outlet hole; 15. a liquid inlet hole; 16. a pressure transfer hole B; 17. a pressure transfer hole A; 18. an adjusting ring; 19; a spring A; 20. a valve core push rod; 21. an inner center tube; 22. a stress ring; 23. a disc spring; 24. a bayonet lock; 25. a sloping block; 26. an elastic claw; 27. a top block; 28. a trapezoidal groove; 29. a guide pin; 30. a small dosing ring; 31. a middle dosing ring; 32. a large dosing ring; 33. a valve opening slideway; 34. opening the upper dead point of the valve slide way; 35. the top dead center of the slideway with large injection allocation amount; 36. the upper dead point of the middle injection allocation slideway; 37. the upper dead point of the small injection allocation slideway; 38. a large injection allocation slide way; 39. a middle injection allocation slide way; 40. a small injection allocation slide way; 41. closing the valve slide way; 42. closing the upper dead point of the valve slide way; 43. sealing the rubber cylinder; 44. a limiting ring; 45. a main cylinder; 46. a communicating hole; 47. a pressure inlet pipeline; 48. a pressure relief pipeline; 49. a core plug; 50. a concave ring; 51. pressing the blind hole; 52. a spring B; 53. a pressure relief vent; 54 pressure relief blind holes; 55. a counterweight guide head; 56. a liquid inlet hole of the rubber cylinder.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention comprises an upper joint 1, a valve core seat 8, an upper outer sleeve 2, an upper central pipe 21 and a valve core 12, wherein the upper end and the lower end of the upper outer sleeve 2 are respectively and fixedly connected with the outer sides of the upper joint 1 and the valve core seat 8, and the upper end and the lower end of the upper central pipe 21 are respectively and hermetically connected with the inner sides of the upper joint 1 and the valve core seat 8; an annular space is reserved between the upper outer sleeve 2 and the upper central tube 21, and an axial valve core mounting hole is processed in the valve core seat 8, which is a structure existing in the prior art and is not described herein again.
As shown in fig. 1-8, the most important innovation of the present invention is: the valve core mounting hole comprises three different hole diameter sections which are respectively called a large diameter section 6, a middle diameter section 10 and a small diameter section 13 according to the hole diameter size relationship, the three sections are sequentially arranged from top to bottom, a valve core push rod 20 is inserted in the valve core mounting hole in a sliding manner, a large diameter piston 7 and a small diameter piston 9 are arranged on the valve core push rod 20, the large diameter piston 7 is sealed in the large diameter section 6 in a sliding manner, the small diameter piston 9 is sealed in the middle diameter section 10 in a sliding manner, the valve core 12 is sealed in the small diameter section 13 in a sliding manner, a liquid inlet hole 15 and a liquid outlet hole 14 for passing liquid are correspondingly arranged on the side surface of the valve core seat 8 and the valve core 12, and the valve core 12 is driven to synchronously move by the up and; the valve core 12 is provided with three liquid passing rings with different sizes in the axial direction, the three liquid passing rings are respectively called as a large metering ring 32, a middle metering ring 31 and a small metering ring 30 according to different sizes, when the large metering ring 32 is aligned with the liquid inlet and outlet holes of the valve core seat 8, the injection amount is large, and when the small metering ring 30 is aligned with the liquid inlet and outlet holes of the valve core seat 8, the injection amount is adjusted to be small.
The end part of the large-diameter section 6 is in threaded connection with a blocking ring 5, the upper end of a valve core push rod 20 penetrates through the center of the blocking ring 5 and is in sliding sealing fit with the blocking ring 5, a pressure transfer hole A17 which feeds liquid into the large-diameter section 6 and pushes the large-diameter piston 7 to move downwards is formed in the inner side of a valve core seat 8 between the blocking ring 5 and the large-diameter piston 7, a spacer ring 11 is arranged in the middle-diameter section 10 in a sliding sealing manner, the lower end of the valve core push rod 20 penetrates through the center of the spacer ring 11 and is in sliding sealing fit with the spacer ring 11, andand a pressure transmission hole B16 which feeds liquid into the medium diameter section 10 and pushes the small diameter piston 9 to move upwards is arranged on the inner side of the valve core seat 8 between the small diameter pistons 9. It should be noted that: the sectional area of the large-diameter piston 7 is only slightly larger than that of the small-diameter piston 9, so that after the prepared liquid enters the two pressure transfer holes at the same time, under the condition of the same pressure, the sectional area of the large-diameter piston 7 is slightly larger, so that the whole valve core push rod 20 is subjected to downward thrust FLower partGreater than upward thrust FOn the upper partAnd the spool push rod 20 goes down. The greater the pressure in the well, FLower partAnd FOn the upper partThe larger is FLower partAnd FOn the upper partThe larger the difference, F will be to avoid confusionLower partAnd FOn the upper partThe difference of (d) is referred to as F1.
The annular space in be inserted and is equipped with the sleeve of releasing 3, the sleeve of releasing 3 processing has axial mounting hole, the cartridge of releasing 4 is inserted in the mounting hole, the upper end of case push rod 20 stretch into in the sleeve of releasing 4, sliding sleeve is equipped with adjustable ring 18 on the case push rod 20 of stifled ring 5 top, case push rod 20 upper end fixedly connected with atress ring 22, be provided with spring A19 between adjustable ring 18 and the atress ring 22, under the spring action of spring A19, atress ring 22 has the trend of keeping away from adjustable ring 18.
The upper end of the adjusting ring 18 is provided with elastic claws 26 and a top block 27 at intervals along the circumferential direction, the upper part of the corresponding valve core push rod 20 is provided with horse teeth matched with the elastic claws 26, when the stress ring 22 is pressed against the upper joint 1, the distance between the horse teeth and the elastic claws 26 is L, the spring A19 is pressed against the top block 27, the outer side of the elastic claws 26 is fixedly connected with an inclined block 25, and the outer side of the lower end of the corresponding unlocking sleeve 4 is provided with a conical surface for unlocking the elastic claws 26. The adjustable ring 18 outside processing have trapezoidal recess 28, go up 2 lateral walls of overcoat and process and have the bayonet lock mounting hole, the bayonet lock mounting hole in be provided with dish spring 23 and bayonet lock 24, bayonet lock 24 part stretches out the bayonet lock mounting hole under the elastic action of dish spring 23, the extension is trapezoidal, adjustable ring 18 goes upward the in-process, at first in the trapezoidal recess 28 of adjustable ring 18 is gone into to bayonet lock 24 card, then the sloping block 25 in the elastic claw 26 outside contacts with release sleeve 4, receives the expanding force elastic claw 26 and releases the card. It should be noted that: the disc spring 23 is loaded more than the spring a19, i.e., the force required to overcome the compression of the disc spring 23 is greater, so that the adjustment ring 18 cannot be pushed down by the spring force of the spring a19 alone when the trapezoidal recess 28 of the adjustment ring 18 is aligned with the detent 24. For ease of understanding, and also to avoid confusion, the spring force of the spring a19 after the trapezoidal groove 28 of the adjustment ring 18 is aligned with the detent 24 is referred to as F2, the force with which the adjustment ring 18 descends to compress the disc spring 23 is referred to as F3, and then F3 is greater than F2.
A guide slideway is processed on the outer wall of the valve core push rod 20 between the large-diameter piston 7 and the small-diameter piston 9, a guide pin 29 is fixedly connected with the side wall of the corresponding valve core seat 8, the valve core push rod 20 moves up and down to complete the switching of the guide pin 29 in the guide slideway, and the guide slideway comprises a valve opening slideway 33, a large injection allocation quantity slideway 38, a middle injection allocation quantity slideway 39, a small injection allocation quantity slideway 40 and a valve closing slideway 41; the length of the valve-opening slide way 33 is smaller than that of the valve-closing slide way 41, the distance from the top dead center 35 of the large dispensing slide way to the top dead center 36 of the medium dispensing slide way is equal to the distance from the center of the large dosing ring 32 to the center of the medium dosing ring 31, and the distance from the top dead center 36 of the medium dispensing slide way to the top dead center 37 of the small dispensing slide way is equal to the distance from the center of the medium dosing ring 31 to the center of the small dosing ring 30. The length value of L is positioned between the valve-opening slide way 33 and the valve-closing slide way 41; the travel of the guide pin 29 within the valve-opening slide 33 when opening the valve does not allow the teeth of the valve spool push rod 20 to contact the resilient fingers 26.
A hole blocking pressure relief device for blocking the pressure transmission hole A17 or the pressure transmission hole B16 is arranged in the central channel in the valve core seat 8.
The hole-blocking pressure relief device has the functions of hole blocking and pressure relief, and F is realized after the hole-blocking pressure relief device blocks the pressure transfer hole B16On the upper partDisappear, leaving only FLower part，FLower partThe valve core push rod 20 is forced to move downwards easily by overcoming the elastic force of the spring A19 and limiting the adjusting ring 18 by the clamping pin 24. When the hole blocking pressure relief device blocks the pressure transfer hole A17, FLower partDisappear, leaving only FOn the upper part，FOn the upper partForcing the spool push rod 20 upward. After the valve core push rod 20 has an ascending mechanism and a descending mechanism, the guide slide way arranged on the outer side of the valve core push rod 20 can be matched with the guide pin 29 to complete the slide way switching.
The hole-blocking pressure relief device comprises a main cylinder body 45, wherein a raised ring is arranged in the middle of the main cylinder body 45, sealing rubber cylinders 43 are arranged on two sides of the raised ring, limiting rings 44 used for limiting the sealing rubber cylinders 43 are fixedly arranged at two ends of the main cylinder body 45, a communication hole 46 used for communicating the inner cavities of the two sealing rubber cylinders 43 is axially processed on the raised ring, a pressure inlet blind hole 51 and a pressure relief blind hole 54 are axially processed on the main cylinder body 45, the pressure inlet blind hole 51 and the pressure relief blind hole 54 are radially communicated, a pressure relief hole 53 used for externally supplying liquid to the pressure inlet blind hole 51 is radially processed on the raised ring, a rubber cylinder liquid inlet hole 56 used for communicating the pressure inlet blind hole 51 with the inner cavity of the lower sealing rubber cylinder 43 is processed on the side wall of the main cylinder body 45 at the lower part of the pressure inlet blind hole 51, a core plug 49 and a spring B52 are arranged in the pressure inlet blind hole 51, wherein the spring B52 is positioned at, at the moment, the communication between the pressure inlet blind hole 51 and the pressure relief blind hole 54 in the radial direction is cut off by the core plug 49, the concave ring 50 is processed at the upper part of the core plug 49, after the core plug 49 descends to the position where the pressure relief hole 53 is aligned with the concave ring 50, the communication between the pressure inlet blind hole 51 and the pressure relief blind hole 54 in the radial direction is opened, so that the pressure relief hole 53 is communicated with the pressure relief blind hole 54; the upper end of the pressure inlet blind hole 51 is communicated with a pressure inlet pipeline 47, and the upper end of the pressure relief blind hole 54 is communicated with a pressure relief pipeline 48.
The lower end of the main cylinder 45 is provided with a counterweight guide head 55.
The two trapezoidal waists at the end of the bayonet 24 are not equal, wherein the waist slope of the upper side is large, and the waist slope of the lower side is small, so that the thrust required by the adjusting ring 18 to go up through the bayonet 24 is small, and the thrust required by the adjusting ring to go down through the bayonet 24 is large.
The working principle and the using process of the invention are as follows:
firstly, in the initial state, the adjusting ring 18 goes upwards to be clamped with the clamping pin 24, in the state, the spring A19 is in a compressed state, and the stress ring 22 abuts against the lower end of the upper connector 1; since the force compressing the disc spring 23 is greater than the force compressing spring A19, the adjustment ring 18 cannot be pushed down by the spring force of spring A19 alone. Thus, without the adjustment ring 18 descending, the spring a19 stores a certain spring force, and the spring a19 applies an upward pushing force F2 to the valve spool push rod 20; it is known that F2 acts on the spool push rod 20 simultaneously with F1, and since the minimum value of F2 is constant, but the magnitude of F1 is related to the pressure in the well, it is assumed that the minimum value of F2 is still greater than F1 at the maximum pressure possible in the well, so that the spool is always in the closed state. In this state, the guide pin 29 is located at the lowermost end of the valve-opening slide 33.
Secondly, opening a valve:
(1) the pressure transmission hole B16 is blocked (a hole blocking pressure relief device is lowered to align with the pressure transmission hole B16, the pressure is pressed on the well through a pressure inlet pipeline 47 to push a core plug 49 to move downwards, the liquid in a pressure inlet blind hole 51 enters a sealing rubber cylinder 43 through a rubber cylinder liquid inlet hole 56 to expand the sealing rubber cylinder 43, and the prepared liquid cannot enter the pressure transmission hole B16 at the moment, so that FOn the upper partDisappeared, but the liquid still exists in the middle diameter section 10, so FLower partThe spool push rod 20 cannot be pushed downward, and therefore, the liquid stored in the bore section 10 needs to be drained. Continuously pressurizing through the pressure inlet pipeline 47 until the concave ring 50 at the upper part of the core plug 49 is aligned with the pressure relief hole 53, and then the liquid stored in the middle diameter section 10 enters the pressure relief pipeline 48 and F through the pressure relief hole 53, the concave ring 50 and the pressure relief blind hole 54Lower partCan push the valve core push rod 20 to move downwards, and the valve core push rod 20 moves downwards to FLower partActing on the adjusting ring 18 through the force-bearing ring 22, the spring A19, due to FLower partFar greater than F2+ F3, so the disc spring 23 is compressed, the bayonet 24 is received in the bayonet mounting hole, the adjusting ring 18 descends to abut against the upper end of the blocking ring 5), the valve core push rod 20 descends, the descending limit displacement is that the guide pin 29 reaches the upper dead point of the valve opening slideway 33, after the point is reached, the valve core push rod 20 cannot descend continuously, and L is greater than the length of the valve opening slideway 33, so the horse teeth on the upper part of the valve core push rod 20 do not contact with the elastic claws 26 at the moment.
(2) The pressure transfer hole B16 is removed (the pressure of the pressure inlet pipeline 47 stops, the sealing rubber cylinder 43 has the tendency of resetting, the liquid in the pressure transfer hole B is extruded out and returns to the pressure inlet blind hole 51 again, the core plug 49 resets to close the pressure relief channel, the bottom hole pressure cannot rush out of the well through the pressure relief channel), the pressure transfer hole A17 is blocked, the valve core push rod 20 moves upwards, and the guide pin 19 leaves the upper dead point 34 of the valve opening slideway and reaches the lower dead point of the large injection allocation quantity slideway 38.
(3) Unblocking pressure transfer holes A17, FOn the upper partAnd FLower partAll of which act on the spool push rod 20 again, it being noted that the minimum value of F2 is reduced after the adjustment ring 18 has been moved downward, as is conventionalF1 generated by the pressure in the distributing well is enough larger than the minimum value of F2, the valve core push rod 20 moves downwards, before the balance of the two forces comes, the guide pin 29 reaches the top dead center 35 of the large distributing injection slide way, and the large distributing ring 32 is aligned with the liquid inlet and outlet holes of the valve core seat 8 at the moment, and the distributing injection is maximum.
Thirdly, adjusting the middle injection amount:
(1) pressure transfer holes A17, FOn the upper partThe valve core push rod 20 is pushed to move upwards, and the guide pin 29 leaves from the upper dead point 35 of the large dosage slide and enters the lower dead point of the middle dosage slide 39.
(2) Unblocking pressure transfer holes A17, FOn the upper partAnd FLower partAnd the F1 pushes the valve core push rod 20 to move downwards against the F2 after the two forces are completely acted on the valve core push rod 20, and before the two forces are balanced, the guide pin 29 reaches the top dead center 36 of the middle dosage slide way, and the middle dosage ring 31 is aligned with the liquid inlet and outlet holes of the valve core seat 8 at the moment, so that the dosage is moderate.
Fourthly, adjusting the injection amount to be small:
(1) pressure transfer holes A17, FOn the upper partThe valve core push rod 20 is pushed to move upwards, and the guide pin 19 is separated from the upper dead point 36 of the dispensing slide and enters the lower dead point of the small dispensing slide 40.
(2) Unblocking pressure transfer holes A17, FOn the upper partAnd FLower partAnd the F1 pushes the valve core push rod 20 to move downwards by overcoming the F2 after the two forces are completely acted on the valve core push rod 20, and before the two forces are balanced, the guide pin 29 reaches the top dead center 37 of the small dosage slide way, and the small dosage ring 30 is aligned with the liquid inlet and outlet holes of the valve core seat 8 at the moment, so that the dosage is minimum.
Fifthly, closing a valve:
(1) pressure transfer holes A17, FOn the upper partPushing the valve spool push rod 20 upwards and the guide pin 29 leaves from the top dead centre 37 of the small dosage slide into the bottom dead centre of the valve closing slide 41.
(2) A blockage removing pressure transmitting hole A17 and blockage pressure transmitting holes B16 and FLower partThe valve core push rod 20 is pushed to move downwards, the guide pin 29 goes from the bottom dead center of the valve closing slideway 41 to the top dead center 42 of the valve closing slideway, and as the length of the valve closing slideway 41 is larger than L, namely horse teeth on the valve core push rod 20 can be meshed with the elastic claws 26, and after the two are meshed, the adjusting ring 18 can move upwards along with the valve core push rod 20.
(3) When the pressure transfer hole B16 is removed and the pressure transfer hole A17 is blocked, the valve core push rod 20 moves upwards to drive the adjusting ring 18 to move upwards, in the process of moving upwards of the adjusting ring 18, the bayonet 24 is clamped into the trapezoidal groove 28 of the adjusting ring 18, then the inclined block 25 on the outer side of the elastic claw 26 is contacted with the unlocking sleeve 4, the elastic claw 26 is unlocked under the expansion force, therefore, the adjusting ring 18 moves to the uppermost end, and the minimum value of F2 is larger than F1. The guide pin 29 enters the valve-opening slide 33 from the top dead center 42 of the valve-closing slide, and waits for the next reopening of the valve. The present application can therefore be repeatedly opened and closed downhole.
Therefore, compared with the traditional mechanical water distributor which needs to salvage the blanking plug to replace the water nozzle for adjusting the injection amount, the invention can adjust the injection amount without salvaging the water nozzle; compared with the emerging electric control water distributor, the invention does not need to be provided with an electric control element underground, so the manufacturing difficulty is reduced, and the safety is higher; therefore, the invention improves the defects of the mechanical water distributor and the electric control water distributor at the same time, and has the characteristics of safety, reliability and convenient operation.
Claims (4)
1. An eccentric oilfield water distributor comprises an upper connector (1), a valve core seat (8), an upper outer sleeve (2), an upper central pipe (21) and a valve core (12), wherein the upper end and the lower end of the upper outer sleeve (2) are fixedly connected to the outer sides of the upper connector (1) and the valve core seat (8) respectively, and the upper end and the lower end of the upper central pipe (21) are hermetically connected to the inner sides of the upper connector (1) and the valve core seat (8) respectively; go up and leave annular space between overcoat (2) and last center tube (21), case seat (8) process and have axial case mounting hole, its characterized in that: the valve core mounting hole comprises three different hole diameter sections which are respectively called a large diameter section (6), a medium diameter section (10) and a small diameter section (13) according to the hole diameter size relationship, the three sections are sequentially arranged from top to bottom, a valve core push rod (20) is inserted in the valve core mounting hole in a sliding manner, a large diameter piston (7) and a small diameter piston (9) are arranged on the valve core push rod (20), the large diameter piston (7) is sealed in the large diameter section (6) in a sliding manner, the small diameter piston (9) is sealed in the medium diameter section (10) in a sliding manner, the valve core (12) is sealed in the small diameter section (13) in a sliding manner, a liquid inlet hole (15) and a liquid outlet hole (14) for passing liquid are correspondingly arranged on the side surface of the valve core seat (8) and the valve core (12), and the valve core push rod (20) is driven to move synchronously by the up; the end part of the large-diameter section (6) is in threaded connection with a blocking ring (5), the upper end of a valve core push rod (20) penetrates through the center of the blocking ring (5) and is in sliding sealing fit with the blocking ring (5), a pressure transfer hole A (17) which is used for feeding liquid into the large-diameter section (6) and pushing the large-diameter piston (7) to descend is formed in the inner side of a valve core seat (8) between the blocking ring (5) and the large-diameter piston (7), a spacer ring (11) is arranged in the middle-diameter section (10) in a sliding sealing manner, the lower end of the valve core push rod (20) penetrates through the center of the spacer ring (11) and is in sliding sealing fit with the spacer ring (11), a pressure transfer hole B (16) which is used for feeding liquid into the middle-diameter section (10) and pushing the small-diameter piston (9) to ascend is arranged in the inner side of the valve core seat (8) between the spacer ring (11) and the small-diameter piston (9), a clamping, a release sleeve (4) is inserted in the mounting hole, the upper end of a valve core push rod (20) extends into the release sleeve (4), an adjusting ring (18) is sleeved on the valve core push rod (20) above the blocking ring (5) in a sliding manner, a stress ring (22) is fixedly connected to the upper end of the valve core push rod (20), a spring A (19) is arranged between the adjusting ring (18) and the stress ring (22), the stress ring (22) has a trend of being far away from the adjusting ring (18) under the elastic action of the spring A (19), elastic claws (26) and ejector blocks (27) are machined at the upper end of the adjusting ring (18) at intervals along the circumferential direction, horse teeth matched with the elastic claws (26) are machined at the upper part of the corresponding valve core push rod (20), when the stress ring (22) abuts against the upper joint (1), the distance between the horse teeth and the elastic claws (26) is L, the spring A (19) abuts against the ejector blocks (27), an inclined block (25) is fixedly connected to the outer side of the elastic claw (26), and a conical surface for releasing the elastic claw (26) is processed on the outer side of the lower end of the corresponding releasing sleeve (4); a trapezoidal groove (28) is processed on the outer side of the adjusting ring (18), a bayonet mounting hole is processed on the side wall of the upper outer sleeve (2), a disc spring (23) and a bayonet (24) are arranged in the bayonet mounting hole, part of the bayonet (24) extends out of the bayonet mounting hole under the elastic action of the disc spring (23), the extending part is trapezoidal, in the ascending process of the adjusting ring (18), firstly, the bayonet (24) is clamped in the trapezoidal groove (28) of the adjusting ring (18), then, an inclined block (25) on the outer side of the elastic claw (26) is contacted with the unclamping sleeve (4), and the elastic claw (26) is subjected to expansion force to unclamping;
a guide slideway is processed on the outer wall of a valve core push rod (20) between a large-diameter piston (7) and a small-diameter piston (9), a guide pin (29) is fixedly connected to the side wall of a corresponding valve core seat (8), the valve core push rod (20) moves up and down to complete the switching of the guide pin (29) in the guide slideway, and the guide slideway comprises a valve opening slideway (33), a large injection allocation quantity slideway (38), a middle injection allocation quantity slideway (39), a small injection allocation quantity slideway (40) and a valve closing slideway (41); the length of the valve opening slide way (33) is smaller than that of the valve closing slide way (41), and the length value of L is positioned between the valve opening slide way (33) and the valve closing slide way (41);
a hole blocking pressure relief device for blocking the pressure transfer hole A (17) or the pressure transfer hole B (16) is arranged in the central channel in the valve core seat (8).
2. The eccentric oilfield water distributor of claim 1, wherein: the hole-blocking pressure relief device comprises a main cylinder body (45), wherein a raised ring is arranged in the middle of the main cylinder body (45), sealing rubber cylinders (43) are arranged on two sides of the raised ring, limiting rings (44) for limiting the sealing rubber cylinders (43) are fixedly arranged at two ends of the main cylinder body (45), a communication hole (46) for communicating the inner cavities of the two sealing rubber cylinders (43) is axially processed on the raised ring, a pressure inlet blind hole (51) and a pressure relief blind hole (54) are axially processed on the main cylinder body (45), the pressure inlet blind hole (51) and the pressure relief blind hole (54) are radially communicated, a pressure relief hole (53) for feeding liquid into the pressure inlet blind hole (51) from the outside is radially processed on the raised ring, a rubber cylinder liquid inlet hole (56) for communicating the pressure inlet blind hole (51) with the inner cavity of the sealing rubber cylinder (43) at the lower side is processed on the side wall of the main cylinder body (45) at the lower part of the pressure inlet blind hole (51), a, wherein spring B (53) is located the below, core stopper (49) have the trend that is located into pressure blind hole (51) upper end under the spring action of spring B (53), advance pressure blind hole (51) and pressure release blind hole (54) radial ascending intercommunication at this moment and be cut off by core stopper (49), core stopper (49) upper portion processing has concave ring (50), core stopper (50) descend to pressure release hole (53) and concave ring (50) counterpoint the back, advance pressure blind hole (51) and pressure release blind hole (54) radial ascending intercommunication and open to pressure release hole (53) and pressure release blind hole (54) intercommunication.
3. The eccentric oilfield water distributor of claim 2, wherein: the lower end of the main cylinder body (45) is provided with a counterweight guide head (55).
4. The eccentric oilfield water distributor of claim 1, wherein: the two trapezoidal waists at the end part of the bayonet lock (24) are not equal, wherein the slope of the waist at the upper side is large, and the slope of the waist at the lower side is small, so that the pushing force required by the adjusting ring (18) to go upwards to pass through the bayonet lock (24) is small, and the pushing force required by the adjusting ring to go downwards to pass through the bayonet lock (24) is large.
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