Reciprocating piston pump for well completion fluid injection

Abstract

The invention provides a reciprocating piston pump for well completion fluid injection, and relates to the field of reciprocating piston pumps. A reciprocating piston pump for well completion fluid injection comprises a pump frame, a PLC control box is fixedly connected to the front face of the pump frame, and cylinder sleeves are fixedly connected to the periphery of the pump frame; supporting assemblies are arranged on the periphery of the bottom of the pump frame, and each supporting assembly comprises a double-head motor fixed to the bottom of an inner cavity of the pump frame. Reciprocating assemblies used in cooperation with the cylinder sleeves are arranged on the periphery of an inner cavity of the pump frame, each reciprocating assembly comprises a driving circular gear fixed to one output shaft of the double-end motor, and acting assemblies matched with the reciprocating assemblies in liquid feeding and discharging are arranged on the outer sides of the cylinder sleeves. According to the reciprocating type piston pump for well completion fluid injection, on the premise of stable supporting, an independent driving source is adopted to conduct synchronous reciprocating acting through the three cam acting units, and the efficient pumping effect on well completion fluid is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of reciprocating piston pumps, and in particular to a reciprocating piston pump for completion fluid injection. Background Art

[0002] Completion fluid is any liquid that comes into contact with the production layer due to operational needs from the time a new well is drilled to the time it is officially put into production. The purpose of completing an oil and gas well is to maximize the communication channels between formations, thereby ensuring that the oil and gas wells achieve the highest yield. The damage to the formation during drilling is mainly manifested in the invasion of the drilling fluid into the formation, the infiltration of the mud filtrate causing the clay components in the production layer to swell and form a water lock effect; the chemical treatment agent in the filtrate produces a colloid or precipitate with the mineral components of the production layer; the invasion of clay in the mud, all of which will block the pores of the production layer and affect the yield. Therefore, before drilling into a production layer with low pressure or certain unknown conditions, the well washing fluid must be replaced and a special completion fluid that protects the production layer must be used.

[0003] In the prior art (the patent application with announcement number CN114198277A and patent name of gear-driven reciprocating piston pump), the piston is driven to move in two dimensions by the rotational reciprocating motion of the gear, which can be linear reciprocating motion or axial rotational motion, to achieve the functions of oil suction and discharge, and has the advantages of simple structure, small size, simple transmission, high displacement, etc. In the process of implementing this technical solution, it is found that there are at least the following problems in the prior art.

[0004] During the continuous extraction of completion fluid, a reciprocating piston pump is required. However, there are many types of reciprocating piston pumps on the market. Some of them use gear transmission directly through a driving source to perform reciprocating work, which can easily lead to severe wear of the gear set and frequent failures. Most of them are single working units, and the extraction efficiency of completion fluid does not meet the expected requirements. Summary of the invention

[0005] The present application aims to at least solve the technical problem in the prior art that it is not possible to achieve efficient extraction of completion fluid by using an independent driving source to synchronously reciprocate through three cam working units under the premise of stable support. To this end, the present application proposes a reciprocating piston pump for completion fluid injection.

[0006] A reciprocating piston pump for completion fluid injection according to an embodiment of the present application comprises: a pump frame, a PLC control box is fixedly connected to the front of the pump frame, and cylinder sleeves are fixedly connected to the four sides of the pump frame; The bottom of the pump frame is provided with support components all around, and the support components include a double-headed motor fixed to the bottom of the inner cavity of the pump frame; The inner cavity of the pump frame is surrounded by reciprocating components used in conjunction with the cylinder sleeve, and the reciprocating components include a driving circular gear fixed on an output shaft of a double-headed motor. The outer side of the cylinder sleeve is provided with a working component that cooperates with the reciprocating component for fluid intake and discharge.

[0007] Preferably, the other output shaft of the double-headed motor is embedded with an electric push rod, and the bottom of the electric push rod is fixedly connected to a driving bevel gear, driven bevel gears are arranged around the bottom of the driving bevel gear, and the outer side of the driven bevel gear is fixedly connected to a long threaded rod that rotates with the pump frame, a threaded barrel is threadedly connected to the long threaded rod, and a support seat that interlaces with the pump frame is arranged on the outer side of the threaded barrel.

[0008] Preferably, the driving circular gear is meshed with driven circular gears on all four sides, and the inner cavity of the driven circular gear is fixedly connected to a rotating shaft that rotates with the pump frame, a cam is fixedly connected to the center of the rotating shaft, and a pulley frame is slidably connected to the cam, and the two sides of the pulley frame away from the cam are fixedly connected to return springs that are fixedly matched with the pump frame.

[0009] Preferably, the working assembly includes a piston rod fixed to the outside of the pulley frame, and the piston rod is slidably connected to the cylinder sleeve, the other end of the piston rod is fixedly connected to a piston that slides with the cylinder sleeve, and the two suction ports at the bottom of the cylinder sleeve are connected to a suction pipe, a suction valve is provided on the suction pipe, and the two discharge ports at the top of the cylinder sleeve are connected to a discharge pipe, and a discharge valve is provided on the discharge pipe.

[0010] Preferably, T-shaped slide rails are provided on both sides of the support seat close to the threaded barrel, and the inner cavity of the T-shaped slide rail is slidably connected to a T-shaped slide fixedly matched with the pump frame, the inner side of the T-shaped slide is fixedly connected to a protective cover that cooperates with the long threaded rod, and movable wheels are embedded around the bottom of the support seat.

[0011] Preferably, the support seat is fixedly connected with threaded seats on all four sides, and the inner cavity of the threaded seat is threadedly connected with a short threaded rod, the top of the short threaded rod is fixedly connected with a rotating wheel, and the bottom of the short threaded rod is fixedly connected with a positioning seat used in conjunction with the moving wheel.

[0012] Preferably, flow sensors are provided at the inner ends of the suction valve and the discharge valve, and a pressure sensor is embedded at one end of the cylinder sleeve away from the pump frame.

[0013] Preferably, the bottom end of the pipette is connected to a pipette rack, and both ends of the pipette rack are connected to pipette heads, and a first electrically controlled valve is provided at one end of the pipette head close to the pipette rack.

[0014] Preferably, the top end of the liquid drain pipe is connected to a liquid drain rack, and both ends of the liquid drain rack are connected to liquid drain heads, and a second electric-controlled valve is provided at one end of the liquid drain head close to the liquid drain rack.

[0015] Preferably, the outer ends of the liquid suction head and the liquid discharge head are fixedly connected with circular flanges for external pipes, and the circular flanges are provided with sealing gasket grooves in an annular manner away from the inner cavities of the liquid suction head and the liquid discharge head.

[0016] The beneficial effects of the present application are as follows: during the completion fluid extraction operation, the double-headed motor provides an independent driving source, saving the power source cost, and the electric push rod adjusts the meshing stroke between the driving bevel gear and the three sets of driven bevel gears, and then the threaded transmission of the three sets of long threaded rods and the threaded barrel cooperates to achieve the effect of extending the support of the three sets of support seats staggered with the pump frame, expanding the supporting area of ​​the three sets of support seats for the pump frame, so that the pump frame as a whole remains stable, and then the double-headed motor supplied as an independent driving source is passed Through the transmission cooperation of the driving circular gear and three sets of driven circular gears, the three sets of rotating shafts drive the three sets of cams, pulley frames and return springs to realize horizontal reciprocating motion, thereby providing reciprocating work compensation for the extraction of completion fluid. Then, the three sets of cams and pulley frames with horizontal reciprocating motion realize reciprocating work in the three sets of cylinder sleeves through the three sets of piston rods and pistons. Then, the two sets of suction pipes and suction valves cooperate with the two sets of discharge pipes and discharge valves to realize efficient extraction of completion fluid, so that the extraction efficiency of completion fluid meets the expected requirements.

[0017] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 is a three-dimensional structural initial state diagram of a reciprocating piston pump for completion fluid injection according to an embodiment of the present application; Figure 2 It is a three-dimensional structural working state diagram of a reciprocating piston pump for completion fluid injection according to an embodiment of the present application; Figure 3 It is a partial cross-sectional view of the three-dimensional structure of a reciprocating piston pump for completion fluid injection according to an embodiment of the present application; Figure 4 It is a partial internal view of the three-dimensional structure of a reciprocating piston pump for completion fluid injection according to an embodiment of the present application; Figure 5 is a top view of the support assembly structure according to an embodiment of the present application; Figure 6 is a bottom view of the support assembly structure according to an embodiment of the present application; Figure 7 is a partial bottom view of the support assembly structure according to an embodiment of the present application; Figure 8 is a bottom exploded view of a support base, a T-shaped slide, a protective cover and a moving wheel structure according to an embodiment of the present application; Fig. 9 It is a side cross-sectional view of the cylinder sleeve, reciprocating assembly, working assembly and anti-blocking assembly structure according to an embodiment of the present application; Fig.10 is a side cross-sectional view of the cylinder sleeve, reciprocating assembly and working assembly structure according to an embodiment of the present application; Fig.11 It is a front view of the structure of the reciprocating assembly and the working assembly according to an embodiment of the present application; Fig.12 is a side view of the reciprocating assembly and the anti-blocking assembly structure according to an embodiment of the present application; Fig.13 is a partial bottom view of the anti-blocking component structure according to an embodiment of the present application; Fig.14 It is a bottom-up cross-sectional view of the pump frame, cylinder sleeve, T-shaped slide and protective cover structure according to an embodiment of the present application.

[0020] Icons: 1. Pump frame; 2. Cylinder sleeve; 3. Support assembly; 31. Double-headed motor; 32. Electric push rod; 33. Driving bevel gear; 34. Driven bevel gear; 35. Long threaded rod; 36. Threaded cylinder; 37. Support seat; 4. Reciprocating assembly; 41. Driving circular gear; 42. Driven circular gear; 43. Rotating shaft; 44. Cam; 45. Pulley frame; 46. Return spring; 5. Working assembly; 51. Piston rod; 52. Piston; 53. Suction tube; 54. Suction valve; 5 5. Drain pipe; 56. Drain valve; 6. Anti-blocking assembly; 61. Short rod; 62. Main bevel gear; 63. Sub bevel gear; 64. Long rod; 65. Crushing blade; 66. Fine filter hole; 7. T-type slide rail; 8. T-type slide; 9. Protective cover; 10. Moving wheel; 11. Threaded seat; 12. Short threaded rod; 13. Rotating wheel; 14. Positioning seat; 15. Flow sensor; 16. Pressure sensor; 17. Liquid aspiration rack; 18. Liquid aspiration head; 19. Drain rack; 20. Drain head. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0022] In order to make the purpose, technical solutions and advantages of the implementation methods of this application clearer, the technical solutions in the implementation methods of this application will be clearly and completely described below in conjunction with the drawings in the implementation methods of this application. Obviously, the described implementation methods are part of the implementation methods of this application, not all of the implementation methods. Based on the implementation methods in this application, all other implementation methods obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0023] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0024] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0025] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0026] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0027] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0028] like Figure 1-Figure 14 As shown, a reciprocating piston pump for completion fluid injection according to an embodiment of the present application includes: a pump frame 1, a PLC control box is fixedly connected to the front of the pump frame 1, and cylinder sleeves 2 are fixedly connected to the four sides of the pump frame 1, and the cylinder sleeves 2 are divided into front and rear working chambers, and support components 3 are arranged around the bottom of the pump frame 1, and the support component 3 includes a double-headed motor 31 fixed to the bottom of the inner cavity of the pump frame 1, and the double-headed motor 31 provides an independent driving source, which saves the power source cost, expands the support area of ​​the pump frame 1, and keeps the pump frame 1 stable as a whole; Reciprocating components 4 for use with the cylinder sleeve 2 are arranged around the inner cavity of the pump frame 1, and the reciprocating component 4 includes a driving circular gear 41 fixed on an output shaft of the double-headed motor 31. A working component 5 for use with the reciprocating component 4 for fluid intake and discharge is arranged on the outer side of the cylinder sleeve 2, so as to achieve efficient extraction of the completion fluid and make the extraction efficiency of the completion fluid meet the expected requirements.

[0029] like Figures 5 to 11 As shown, another output shaft of the double-headed motor 31 is embedded with an electric push rod 32, and the bottom of the electric push rod 32 is fixedly connected to a driving bevel gear 33, and driven bevel gears 34 are arranged around the bottom of the driving bevel gear 33. The electric push rod 32 adjusts the meshing stroke between the driving bevel gear 33 and the three groups of driven bevel gears 34, and the outer side of the driven bevel gear 34 is fixedly connected to a long threaded rod 35 that rotates with the pump frame 1, and a threaded cylinder 36 is threadedly connected to the long threaded rod 35, and a support seat 37 that interlaced with the pump frame 1 is arranged on the outer side of the threaded cylinder 36. The threaded transmission of the three groups of long threaded rods 35 and the threaded cylinder 36 is coordinated to achieve the effect of extending the support of the three groups of support seats 37 that are interlaced with the pump frame 1, expand the support area of ​​the three groups of support seats 37 on the pump frame 1, and keep the pump frame 1 stable as a whole; T-shaped slide rails 7 are provided on both sides of the support seat 37 close to the threaded barrel 36, and the inner cavity of the T-shaped slide rail 7 is slidably connected with a T-shaped slide 8 fixedly matched with the pump frame 1, which plays a role of sliding limit for the support seat 37 in the extended state. By utilizing the stable outward extension of the support seat 37, a protective cover 9 that cooperates with the long threaded rod 35 is fixedly connected to the inner side of the T-shaped slide 8. When the support seat 37 is outward extended, the protective cover 9 plays a protective and shielding role for the leaked long threaded rod 35, and the bottom of the support seat 37 is embedded with moving wheels 10 around it, which plays a role of mobile support for the support seat 37; The support seat 37 is fixedly connected with a threaded seat 11 on all four sides, and the inner cavity of the threaded seat 11 is threadedly connected with a short threaded rod 12, the top of the short threaded rod 12 is fixedly connected with a rotating wheel 13, and the bottom of the short threaded rod 12 is fixedly connected with a positioning seat 14 used in conjunction with the moving wheel 10. By rotating the rotating wheel 13 clockwise, the rotating wheel 13 drives the positioning seat 14 to move downward through the threaded seat 11, thereby positioning the support seat 37 in the extended state.

[0030] The driving circular gear 41 is meshed with driven circular gears 42 all around. The double-headed motor 31, which is an independent driving source, cooperates with the driving circular gear 41 and three groups of driven circular gears 42 through transmission. The inner cavity of the driven circular gear 42 is fixedly connected with a rotating shaft 43 that rotates with the pump frame 1. A cam 44 is fixedly connected to the center of the rotating shaft 43. A pulley frame 45 is slidably connected to the cam 44. Both sides of the pulley frame 45 away from the cam 44 are fixedly connected with return springs 46 that are fixedly matched with the pump frame 1. The three groups of rotating shafts 43 drive the three groups of cams 44, the pulley frame 45 and the return spring 46 to achieve horizontal reciprocating motion, thereby providing reciprocating work compensation for the completion fluid extraction operation. The working assembly 5 includes a piston rod 51 fixed to the outside of the pulley frame 45, and the piston rod 51 is slidably connected to the cylinder sleeve 2. The other end of the piston rod 51 is fixedly connected to a piston 52 that slidably cooperates with the cylinder sleeve 2. The three groups of cams 44 and the pulley frame 45 that reciprocate horizontally realize reciprocating work in the three groups of cylinder sleeves 2 through the three groups of piston rods 51 and pistons 52. The two suction ports at the bottom of the cylinder sleeve 2 are connected to a suction pipe 53, and a suction valve 54 is provided on the suction pipe 53. The two discharge ports at the top of the cylinder sleeve 2 are connected to a discharge pipe 55, and a discharge valve 56 is provided on the discharge pipe 55. The two groups of suction pipes 53 and suction valves 54 cooperate with the two groups of discharge pipes 55 and discharge valves 56 to achieve efficient extraction of completion fluid, so that the extraction efficiency of completion fluid meets the expected requirements. The inner ends of the suction valve 54 and the discharge valve 56 are both provided with flow sensors 15 to monitor the completion fluid flow through the suction valve 54 and the discharge valve 56 in real time, and a pressure sensor 16 is embedded in the end of the cylinder liner 2 away from the pump frame 1 to monitor the internal pressure of the cylinder liner 2 in real time. The bottom end of the suction pipe 53 is connected to the suction frame 17, and both ends of the suction frame 17 are connected to the suction head 18. The end of the suction head 18 close to the suction frame 17 is provided with a first electrically controlled valve to facilitate the suction of the completion fluid into the cylinder liner 2. The top end of the discharge pipe 55 is connected to the discharge frame 19, and both ends of the discharge frame 19 are connected to the discharge head 20. The end of the discharge head 20 close to the discharge frame 19 is provided with a second electrically controlled valve to facilitate the discharge of the completion fluid sucked into the cylinder liner 2 into the discharge frame 19. The outer ends of the suction head 18 and the discharge head 20 are fixedly connected with circular flanges for external pipelines, which is convenient for flange fixing of the suction head 18 and the discharge head 20 to complete the installation of external inlet and outlet pipes, and the circular flange is provided with a sealing gasket groove in an annular shape away from the inner cavity of the suction head 18 and the discharge head 20, which is convenient for installing a sealing gasket in the sealing gasket groove in the circular flange, so that the suction head 18 and the discharge head 20 are installed more tightly with the external inlet and outlet pipes to prevent leakage of the completion fluid.

[0031] like Fig.12 and Fig.13 As shown, during the completion fluid extraction operation, impurities are present in the sucked completion fluid, which is easy to cause blockage in the extraction pipeline. The pumping pipeline does not have a filtering and anti-blocking function, resulting in frequent blockage of the reciprocating piston pump inlet and outlet pipes, which is not worth the loss. The inner cavities of the suction rack 17 and the discharge rack 19 are both provided with an anti-blocking component 6 used in conjunction with the reciprocating component 4, and the anti-blocking component 6 includes a short rod 61 fixed to the upper and lower sides of the rotating shaft 43, and the end of the short rod 61 away from the rotating shaft 43 is fixedly connected to the main bevel gear 62, and the outer side of the main bevel gear 62 is meshed with a secondary bevel gear 63. The three groups of rotating shafts 43 drive the upper and lower three groups of main bevel gears 62 to rotate through the three groups of short rods 61, and the three groups of main bevel gears 62 drive the three groups of secondary bevel gears 63 to rotate accordingly; The inner cavity of the secondary bevel gear 63 is fixedly connected with a long rod 64 that rotates with the pump frame 1, the suction frame 17 and the discharge frame 19, and the other end of the long rod 64 is fixedly connected with a crushing leaf 65 used in conjunction with the suction frame 17 and the discharge frame 19. The crushing leaf 65 is provided with a fine filter hole 66 used in conjunction with the suction head 18 and the discharge head 20. The three sets of secondary bevel gears 63 drive the upper and lower three sets of crushing leaves 65 to rotate in the suction frame 17 and the discharge frame 19 through the three sets of long rods 64 to perform double flow disturbance treatment on the completion fluid discharged into the suction frame 17 and the discharge frame 19 to prevent the completion fluid from accumulating in the suction frame 17 and the discharge frame 19. At the same time, the fine filter hole 66 that rotates with the upper and lower three sets of crushing leaves 65 performs double filtering on the large particles of impurities in the completion fluid discharged into the suction frame 17 and the discharge frame 19 to prevent the large particles of impurities from clogging the inlet and discharge pipelines, so as to avoid frequent cleaning of the pipelines.

[0032] Specifically, the working principle of the reciprocating piston pump for completion fluid injection is as follows: first, the pump frame 1 is moved to the completion fluid extraction position by the moving wheels 10 at the bottom of the three sets of support seats 37 in the initial state, and then the electric push rod 32 is controlled to open and drive the driving bevel gear 33 to move down and get stuck in the meshing part of the three sets of driven bevel gears 34, and then the double-headed motor 31 as an independent driving source is controlled to open and drive the three sets of driven bevel gears 34 to rotate through the driving bevel gear 33 that is meshed in place, and the three sets of driven bevel gears 34 drive The three groups of long threaded rods 35 rotate in the three groups of threaded barrels 36. Under the cooperation of the movement of the three groups of moving wheels 10, the three groups of long threaded rods 35 drive the three groups of support seats 37 to expand outwards through the three groups of threaded barrels 36. Since the three groups of T-shaped slides 8 and the protective covers 9 are fixedly connected to the pump frame 1 and are in a stationary state, the three groups of support seats 37 that are expanded outwards drive the three groups of T-shaped slide rails 7 to slide outwards on the three groups of T-shaped slides 8. The three groups of protective covers 9 protect and cover the three groups of long threaded rods 35 that are gradually leaking out. After the three groups of support seats 37 are extended in place, the double-headed motor 31 is first controlled to pause, and then the electric push rod 32 is controlled to close and drive the driving bevel gear 33 to move up and disengage the meshing part of the three groups of driven bevel gears 34 to the initial position, and then the three groups of rotating wheels 13 are rotated clockwise respectively and drive the short threaded rods 12 to move downward in the threaded seat 11, and the three groups of short threaded rods 12 drive the three groups of positioning seats 14 to move downward to the ground surface, and firmly position the three groups of support seats 37 that are extended in place, so that the three groups of moving wheels 10 no longer move, and the stable support work of the pump frame 1 can be completed; After the pump frame 1 is supported firmly, the double-headed motor 31 as an independent driving source is controlled to start again and drive the driving circular gear 41 to rotate. At this time, the driving bevel gear 33 on the electric push rod 32 is in an idling state, and the driving circular gear 41 drives the rotating shafts 43 on the three sets of driven circular gears 42 to rotate synchronously. The three sets of rotating shafts 43 drive the three sets of cams 44 to rotate synchronously, and the three sets of cams 44 drive the three sets of pulley frames 45 to move back and forth horizontally, and perform frequency compression and release operations on the three sets of return springs 46. Then, the three sets of pulley frames 45 drive the three sets of pistons 52 on the piston rods 51 to reciprocate in the three sets of cylinder sleeves 2. Since the three sets of cylinder sleeves 2 are divided into two front and rear working chambers by the three sets of pistons 52, and the three sets of cylinder sleeves 2 are provided with two sets of suction pipes 53 and discharge pipes 55 above and below, with this design, the three sets of pistons 52 can perform work in different states in the front and rear working chambers in the three sets of cylinder sleeves 2; When the three-group pulley frame 45 slides to the nearest end of the three-group cam 44 under the elastic restoring force of the three-group restoring spring 46, the three-group piston 52 is in the return stroke suction state in the front end working chamber in the three-group cylinder sleeve 2, and the suction valve 54 on the three-group suction pipe 53 located at the front end working chamber position in the three-group cylinder sleeve 2 is controlled to open, and the discharge valve 56 on the three-group discharge pipe 55 is closed. Then, the negative pressure suction force generated by the three-group piston 52 in the front end working chamber in the three-group cylinder sleeve 2 is transmitted to the suction head 18 on the three-group suction rack 17 through the three-group suction pipe 53. Under the action of the negative pressure suction force, the completion fluid is then sucked into the front end working chamber in the three-group cylinder sleeve 2 through the three-group suction head 18, the suction rack 17 and the suction pipe 53 in sequence; At the same time, since the three groups of pistons 52 are in the return stroke liquid inlet state in the front end working chamber in the three groups of cylinder sleeves 2, on the contrary, the three groups of pistons 52 in the return stroke liquid inlet state now move to the rear end working chamber in the three groups of cylinder sleeves 2, and the three groups of pistons 52 in the rear end working chamber in the three groups of cylinder sleeves 2 are in the process liquid discharge state. At this time, the liquid suction valve 54 on the three groups of liquid suction pipes 53 located at the rear end working chamber position in the three groups of cylinder sleeves 2 is controlled to be closed, and the liquid discharge valve 56 on the three groups of liquid discharge pipes 55 is opened, then the three groups of pistons 52 in the process liquid discharge state discharge the completion fluid previously sucked in the rear end working chamber in the three groups of cylinder sleeves 2 through the three groups of liquid discharge pipes 55 to the three groups of liquid discharge racks 19; When the farthest end of the three-group cam 44 pushes and squeezes the three-group pulley frame 45 and the three-group return spring 46, similarly, the three-group piston 52 is in the process discharge state in the front end working chamber of the three-group cylinder sleeve 2, and the suction valve 54 on the three-group suction pipe 53 located in the front end working chamber of the three-group cylinder sleeve 2 is controlled to be closed, and the discharge valve 56 on the three-group discharge pipe 55 is opened, then the completion fluid sucked into the front end working chamber of the three-group cylinder sleeve 2 is discharged into the three-group discharge frame 19 through the three-group discharge pipe 55. At this time, the three-group piston 52 is in the return state in the rear end working chamber of the three-group cylinder sleeve 2. In the liquid suction state, the liquid suction valves 54 on the three groups of liquid suction pipes 53 located in the rear working chambers of the three groups of cylinder sleeves 2 are controlled to open, and the liquid discharge valves 56 on the three groups of liquid discharge pipes 55 are closed, and then the completion fluid is sucked into the rear working chambers of the three groups of cylinder sleeves 2 through the three groups of liquid suction heads 18, the liquid suction racks 17 and the liquid suction pipes 53 in sequence, and so on, each group of reciprocating pistons 52 completes the double suction work of the completion fluid in the front and rear chambers of the cylinder sleeve 2, and three cams 44, pulley racks 45 and pistons 52 provide three working units, so as to achieve an efficient extraction effect on the completion fluid; While the three groups of suction heads 18 suck the completion fluid into the three groups of suction racks 17, and the three groups of discharge pipes 55 discharge the sucked completion fluid to the three groups of discharge racks 19, the three groups of rotating shafts 43 drive the three groups of cams 44 to rotate synchronously, and the three groups of rotating shafts 43 also drive the three groups of short rods 61 to rotate synchronously, and the three groups of short rods 61 drive the upper and lower three groups of main bevel gears 62 to rotate accordingly, and the upper and lower three groups of main bevel gears 62 drive the long rods 64 on the three groups of auxiliary bevel gears 63 to rotate accordingly, and the upper and lower three groups of long rods 64 drive the three groups of crushing leaves 65 to rotate on the upper and lower three groups of suction racks. The three groups of crushing leaves 65 in the rotating state perform double turbulence crushing treatment on the completion fluid discharged into the three groups of liquid suction racks 17 and the liquid discharge racks 19. At the same time, the fine filter holes 66 that rotate synchronously with the three groups of crushing leaves 65 perform double fine filtration on the large particle impurities in the completion fluid in the three groups of liquid suction racks 17 and the liquid discharge racks 19 to prevent the large particle impurities from clogging the pipeline. After the completion fluid in the three groups of liquid discharge racks 19 is crushed and filtered, it can be discharged through the external pipeline by the three groups of liquid discharge heads 20.

[0033] It should be noted that the specific model specifications of the double-headed motor 31 and the electric push rod 32 need to be selected and determined according to the actual specifications of the device, and the specific selection calculation method adopts the existing technology in this field, so it will not be described in detail.

[0034] The power supply and principles of the double-headed motor 31 and the electric push rod 32 as well as various valves and sensors are clear to those skilled in the art and will not be described in detail herein.

[0035] The above are only embodiments of the present application and are not intended to limit the scope of protection of the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0036] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A reciprocating piston pump for completion fluid injection, characterized in that: include: A pump frame (1), wherein a PLC control box is fixedly connected to the front of the pump frame (1), and cylinder sleeves (2) are fixedly connected to the four sides of the pump frame (1); Support components (3) are arranged around the bottom of the pump frame (1), and the support components (3) include a double-headed motor (31) fixed to the bottom of the inner cavity of the pump frame (1); A reciprocating assembly (4) for use with the cylinder sleeve (2) is arranged around the inner cavity of the pump frame (1), and the reciprocating assembly (4) includes a driving circular gear (41) fixed on an output shaft of a double-headed motor (31), and a working assembly (5) for use with the reciprocating assembly (4) for fluid inlet and outlet is arranged on the outer side of the cylinder sleeve (2).

2. A reciprocating piston pump for completion fluid injection according to claim 1, characterized in that: The other output shaft of the double-headed motor (31) is embedded with an electric push rod (32), and the bottom of the electric push rod (32) is fixedly connected to a driving bevel gear (33), and driven bevel gears (34) are arranged around the bottom of the driving bevel gear (33), and the outer side of the driven bevel gear (34) is fixedly connected to a long threaded rod (35) that rotates with the pump frame (1), and the long threaded rod (35) is threadedly connected to a threaded barrel (36), and the outer side of the threaded barrel (36) is provided with a support seat (37) that staggers with the pump frame (1).

3. A reciprocating piston pump for completion fluid injection according to claim 2, characterized in that: The driving circular gear (41) is meshed with driven circular gears (42) on all sides, and the inner cavity of the driven circular gear (42) is fixedly connected to a rotating shaft (43) that rotates with the pump frame (1). A cam (44) is fixedly connected to the center of the rotating shaft (43), and a pulley frame (45) is slidably connected to the cam (44). Both sides of the pulley frame (45) away from the cam (44) are fixedly connected to return springs (46) that are fixedly matched with the pump frame (1).

4. A reciprocating piston pump for completion fluid injection according to claim 3, characterized in that: The working assembly (5) comprises a piston rod (51) fixed to the outside of the pulley frame (45), and the piston rod (51) is slidably connected to the cylinder sleeve (2), the other end of the piston rod (51) is fixedly connected to a piston (52) slidably matched with the cylinder sleeve (2), and two liquid suction ports at the bottom of the cylinder sleeve (2) are connected to a liquid suction pipe (53), and a liquid suction valve (54) is provided on the liquid suction pipe (53), and two liquid discharge ports at the top of the cylinder sleeve (2) are connected to a liquid discharge pipe (55), and a liquid discharge valve (56) is provided on the liquid discharge pipe (55).

5. A reciprocating piston pump for completion fluid injection according to claim 4, characterized in that: The support seat (37) is provided with T-shaped slide rails (7) on both sides close to the threaded barrel (36), and the inner cavity of the T-shaped slide rail (7) is slidably connected to a T-shaped slide bracket (8) fixedly matched with the pump frame (1), and the inner side of the T-shaped slide bracket (8) is fixedly connected to a protective cover (9) that is protectively matched with the long threaded rod (35), and movable wheels (10) are embedded around the bottom of the support seat (37).

6. A reciprocating piston pump for completion fluid injection according to claim 5, characterized in that: The support seat (37) is fixedly connected to a threaded seat (11) on all four sides, and the inner cavity of the threaded seat (11) is threadedly connected to a short threaded rod (12), the top of the short threaded rod (12) is fixedly connected to a rotating wheel (13), and the bottom of the short threaded rod (12) is fixedly connected to a positioning seat (14) used in conjunction with the moving wheel (10).

7. A reciprocating piston pump for completion fluid injection according to claim 6, characterized in that: The inner ends of the liquid suction valve (54) and the liquid discharge valve (56) are both provided with flow sensors (15), and a pressure sensor (16) is embedded in the end of the cylinder sleeve (2) away from the pump frame (1).

8. A reciprocating piston pump for completion fluid injection according to claim 7, characterized in that: The bottom end of the liquid pipette (53) is connected to a liquid pipette rack (17), and both ends of the liquid pipette rack (17) are connected to a liquid pipette head (18), and a first electric control valve is provided at one end of the liquid pipette head (18) close to the liquid pipette rack (17).

9. A reciprocating piston pump for completion fluid injection according to claim 8, characterized in that: The top end of the liquid discharge pipe (55) is connected to a liquid discharge rack (19), and both ends of the liquid discharge rack (19) are connected to liquid discharge heads (20), and a second electrically controlled valve is provided at one end of the liquid discharge head (20) close to the liquid discharge rack (19).

10. A reciprocating piston pump for completion fluid injection according to claim 9, characterized in that: The outer ends of the liquid suction head (18) and the liquid discharge head (20) are both fixedly connected with circular flanges for external pipes, and the circular flanges are provided with sealing gasket grooves in an annular manner away from the inner cavities of the liquid suction head (18) and the liquid discharge head (20).

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