Drilling pump for oil field drilling

Abstract

The drilling pump comprises a main machine shell, a middle pipe and a variable shell body, the middle pipe is located between the main machine shell and the variable shell body, the two ends of the middle pipe are fixedly connected with the main machine shell and the variable shell body respectively, and a piston is connected into the middle pipe in a sliding mode. A butt joint rod is fixedly connected to the side, close to the main machine shell, of the piston, a butt joint disc is fixed to the other end of the butt joint rod, and a driving assembly is arranged in the main machine shell. According to the drilling mud pump, the main machine shell, the middle pipe, the variable shell, the driving assembly, the piston, the butt joint assembly, the water inlet pipe and the water outlet pipe are arranged, the driving assembly can pull the piston to move back and forth in the middle pipe through the butt joint assembly, and therefore drilling mud is pumped into the variable shell and then discharged through the drainage pipe; and the butt-joint assembly and the butt-joint rod at one end of the piston can be quickly detached, so that the piston is detached and replaced, and the piston replacement difficulty is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of oil field drilling, in particular to a drilling pump for oil field drilling. Background Art

[0002] The oilfield drilling mud pump is one of the indispensable and important equipment in oil drilling engineering, with the characteristics of compact structure, stable operation, large flow rate and wide application range. It is mainly composed of pump head, cylinder sleeve, piston, valve plate, transmission shaft, etc. The transmission shaft is driven by the motor to make the piston reciprocate in the cylinder sleeve to achieve the suction and discharge of mud.

[0003] Since the piston in the drilling pump is a vulnerable part, it is often necessary to replace the piston to ensure that the drilling pump can work normally. However, the connection method between the piston and the drive assembly of the existing drilling pump uses a large number of bolts and sleeves for connection, and the disassembly and installation are time-consuming, which affects the efficiency of piston replacement. Secondly, when the drilling pump pumps mud into the pump body, the fine sand in the mud easily wears the piston, thereby reducing the service life of the piston and causing a high frequency of piston replacement. Therefore, the utility model proposes a drilling pump for oilfield drilling. Utility Model Content

[0004] The utility model aims to solve the shortcomings in the prior art and proposes a drilling pump for oil field drilling.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a drilling pump for oilfield drilling, comprising a main casing, an intermediate pipe and a variable casing, the intermediate pipe is located between the main casing and the variable casing, and the two ends of the intermediate pipe are respectively fixedly connected to the main casing and the variable casing, a piston is slidably connected inside the intermediate pipe, a docking rod is fixedly connected to the side of the piston close to the main casing, and a docking plate is fixed to the other end of the docking rod, a driving assembly is arranged inside the main casing, a docking assembly is commonly connected between the driving assembly and the docking plate, a notch is provided at the top end of the intermediate pipe and close to the docking assembly, a through opening is provided at the side of the variable casing close to the intermediate pipe, the side of the variable casing away from the through opening is open in design and is fixedly connected to an end cover by bolts, a filter assembly is fixedly connected to the side of the end cover located in the variable casing, and a water inlet pipe and a water outlet pipe are respectively fixedly connected to the bottom and top ends of the variable casing.

[0006] Furthermore, the docking assembly includes a push-pull rod, which is fixedly connected to a connecting plate at one end near the docking plate. A groove is provided at the top of the connecting plate. A U-shaped clamping plate is jointly clamped in the groove and the top of the docking plate. A tightening screw is passed through one side of the U-shaped clamping plate and is threadedly connected.

[0007] Furthermore, a positioning rod is fixedly connected to the bottom end of the connection plate, and a positioning hole for inserting the positioning rod is opened at the bottom end of the docking plate.

[0008] Furthermore, the driving assembly includes a disc located inside the main housing, a motor for driving the disc to rotate is fixed outside the main housing, a crank connecting rod is rotatably connected to the side of the disc, the push-pull rod is fixedly connected to a U-shaped seat at one end away from the connecting disc, and the crank connecting rod is rotatably connected to the U-shaped seat.

[0009] Furthermore, the filter assembly includes a plurality of cross bars fixed to the surface of the end cover, the other ends of the plurality of cross bars are commonly fixedly connected to a frame plate, a filter screen is arranged inside the frame plate, a sealing ring is fixedly connected to one side of the frame plate close to the through opening, and the sealing ring is fitted to the inner wall of the variable housing.

[0010] Furthermore, a handle is fixedly connected to the side of the piston away from the docking rod.

[0011] Furthermore, a one-way valve is fixedly connected to the middle of the water inlet pipe and the water outlet pipe.

[0012] Beneficial effects of the utility model:

[0013] 1. When the utility model is in use, the drilling pump for oilfield drilling is provided with a main casing, an intermediate pipe, a variable casing, a driving assembly, a piston, a docking assembly, a water inlet pipe and a water outlet pipe. The driving assembly can pull the piston to move back and forth in the intermediate pipe through the docking assembly, so as to draw the drilling mud into the variable casing and then discharge it through the drain pipe. When the piston needs to be replaced, the docking assembly and the docking rod at one end of the piston can be quickly disassembled to realize the disassembly and replacement of the piston, thereby reducing the difficulty of replacing the piston.

[0014] 2. When the utility model is in use, the drilling pump for oil field drilling is provided with an end cover, a cross bar, a frame plate, a filter screen and a sealing ring. When the piston moves to draw mud into the variable housing and the interior of the intermediate tube, the filter screen can prevent mud and sand from entering the intermediate tube, thereby preventing the piston from being worn by mud and sand, thereby increasing the service life of the piston and reducing the frequency of replacing the piston. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solution of the present invention, the drawings required for use in the description of the specific implementation methods will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 : An overall cross-sectional view of the utility model;

[0017] Figure 2: A partial stereogram of the utility model;

[0018] Figure 3 :The utility model Figure 1 Enlarged view of point A in the middle.

[0019] The reference numerals are as follows:

[0020] 1. Main housing; 2. Intermediate pipe; 3. Variable housing; 31. Through opening; 4. Disc; 5. Crank connecting rod; 6. Piston; 7. Docking rod; 8. Docking plate; 81. Positioning hole; 9. Docking assembly; 91. Push-pull rod; 92. U-shaped seat; 93. Connecting plate; 94. Positioning rod; 95. Groove; 96. U-shaped clamping plate; 97. Tightening screw; 10. Notch; 11. End cover; 12. Cross bar; 13. Frame plate; 14. Filter screen; 15. Sealing ring; 16. Water inlet pipe; 17. Water outlet pipe; 18. One-way valve. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] like Figure 1-Figure 3 As shown, it relates to a drilling pump for oilfield drilling, including a main casing 1, an intermediate pipe 2 and a variable casing 3, the intermediate pipe 2 is located between the main casing 1 and the variable casing 3, and the two ends of the intermediate pipe 2 are fixedly connected to the main casing 1 and the variable casing 3 respectively, a piston 6 is slidably connected inside the intermediate pipe 2, a docking rod 7 is fixedly connected to the side of the piston 6 close to the main casing 1, and a docking plate 8 is fixed to the other end of the docking rod 7, a driving component is arranged inside the main casing 1, a docking component 9 is commonly connected between the driving component and the docking plate 8, a notch 10 is provided at the top end of the intermediate pipe 2 and close to the docking component 9, a through opening 31 is provided at the side of the variable casing 3 close to the intermediate pipe 2, the side of the variable casing 3 away from the through opening 31 is open and is fixedly connected to an end cover 11 by bolts, a filter component is fixedly connected to the side of the end cover 11 located in the variable casing 3, and a water inlet pipe 16 and a water outlet pipe 17 are fixedly connected to the bottom and top of the variable casing 3 respectively.

[0023] like Figure 1-Figure 2 As shown, the docking assembly 9 includes a push-pull rod 91, and the push-pull rod 91 is fixedly connected to a connecting plate 93 at one end close to the docking plate 8. A groove 95 is provided at the top of the connecting plate 93. The groove 95 and the top of the docking plate 8 are jointly clamped with a U-shaped clamping plate 96. A tightening screw 97 is passed through one side of the U-shaped clamping plate 96 and is threadedly connected.

[0024] When the connecting plate 93 and the docking plate 8 are fitted together, the U-shaped clamping plate 96 can be clamped in the groove 95 and the top surface of the docking plate 8, and then the tightening screw 97 can be tightened to achieve a fixed connection between the docking plate 8 and the connecting plate 93, and the driving component can push and pull the piston 6 to move through the docking component 9.

[0025] like Figure 2 As shown, a positioning rod 94 is fixedly connected to the bottom end of the connecting plate 93 , and a positioning hole 81 for inserting the positioning rod 94 is opened at the bottom end of the docking plate 8 .

[0026] When docking the connection plate 93 and the docking plate 8 , the positioning rod 94 can be inserted into the positioning hole 81 to achieve precise docking of the connection plate 93 and the docking plate 8 .

[0027] like Figure 1-Figure 2 As shown, the driving assembly includes a disc 4 located inside the main housing 1, a motor for driving the disc 4 to rotate is fixed outside the main housing 1, the disc 4 is rotatably connected to a crank connecting rod 5 on the side, a push-pull rod 91 is fixedly connected to a U-shaped seat 92 at one end away from the connecting disc 93, and the crank connecting rod 5 is rotatably connected to the U-shaped seat 92.

[0028] When the motor drives the disc 4 to rotate, the crank connecting rod 5 pulls the U-shaped seat 92 and the push-pull rod 91 to move laterally, thereby driving the docking rod 7 and the piston 6 to move laterally back and forth in the intermediate tube 2 through the driving assembly.

[0029] like Figure 1 and Figure 3 As shown, the filter assembly includes a plurality of cross bars 12 fixed to the surface of the end cover 11, the other ends of the plurality of cross bars 12 are commonly fixedly connected to a frame plate 13, a filter screen 14 is arranged inside the frame plate 13, a sealing ring 15 is fixedly connected to one side of the frame plate 13 close to the through opening 31, and the sealing ring 15 is fitted with the inner wall of the variable housing 3.

[0030] The filter screen 14 is blocked at the through opening 31 , so that when mud enters the variable housing 3 and the middle pipe 2 from the water inlet pipe 16 , mud and sand will not enter the middle pipe 2 , thereby preventing the piston 6 from being worn by mud and sand.

[0031] like Figure 1 As shown, a handle is fixedly connected to the piston 6 away from the docking rod 7. When the piston 6 is disassembled, it is convenient to pull the piston 6 out from the through opening 31 of the variable housing 3 and the opening on the other side by the handle.

[0032] like Figure 1 As shown, a one-way valve 18 is fixedly connected to the middle of the water inlet pipe 16 and the water outlet pipe 17. The one-way valve 18 allows mud to enter the variable housing 3 only from the water inlet pipe 16 and then be discharged from the water outlet pipe 17.

[0033] Working principle: When the motor outside the main housing 1 drives the disc 4 to rotate, it will drive the docking assembly 9, the docking rod 7 and the piston 6 to reciprocate inside the intermediate tube 2 through the crank connecting rod 5. When the piston 6 is away from the variable housing 3, the mud is drawn from the water inlet pipe 16 into the variable housing 3. When the piston 6 is close to the variable housing 3, the mud in the variable housing 3 is squeezed out from the water outlet pipe 17. In this process, the filter 14 can prevent fine sand from entering the intermediate tube 2, thereby reducing the wear of the piston 6 and increasing the service life of the piston 6. When the piston 6 needs to be replaced, the end cover 11 can be removed from the open side of the variable housing 3. When the end cover 11 is removed, it can be pulled out from the inside of the variable housing 3 together with the filter assembly, which is convenient for cleaning the filter 14. Then, loosen the tightening screw 97 at the notch 10, then remove the U-shaped card plate 96 from the top of the docking plate 8 and the connecting plate 93, and finally pull out the piston 6 from the open side of the variable housing 3 and the through opening 31, then replace the new piston 6 and insert it into the intermediate tube 2, and fit the docking plate 8 corresponding to the new piston 6 with the connecting plate 93, then clamp the U-shaped card plate 96 on the top of the docking plate 8 and the connecting plate 93 and tighten the tightening screw 97. Then insert the cleaned filter assembly into the variable housing 3, and then fix the end cover 11 to the open side of the variable housing 3 with bolts.

[0034] The preferred embodiments of the utility model disclosed above are only used to help explain the utility model. The preferred embodiments do not describe all the details in detail, nor do they limit the utility model to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the utility model, so that technicians in the relevant technical field can well understand and use the utility model. The utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A drilling pump for oilfield drilling, comprising a main casing (1), an intermediate pipe (2) and a variable casing (3), characterized in that: The intermediate tube (2) is located between the main housing (1) and the variable housing (3), and the two ends of the intermediate tube (2) are fixedly connected to the main housing (1) and the variable housing (3) respectively. A piston (6) is slidably connected inside the intermediate tube (2). A docking rod (7) is fixedly connected to the side of the piston (6) close to the main housing (1), and a docking plate (8) is fixed to the other end of the docking rod (7). A driving component is provided inside the main housing (1), and a docking component (9) is commonly connected between the driving component and the docking plate (8). A notch (10) is provided at the top end of the intermediate tube (2) and near the docking assembly (9); a through opening (31) is provided at the side of the variable housing (3) near the intermediate tube (2); a side of the variable housing (3) away from the through opening (31) is open and fixedly connected to an end cover (11) by bolts; a side of the end cover (11) located inside the variable housing (3) is fixedly connected to a filter assembly; a water inlet pipe (16) and a water outlet pipe (17) are fixedly connected to the bottom and top ends of the variable housing (3), respectively.

2. A drilling pump for oilfield drilling according to claim 1, characterized in that: The docking assembly (9) comprises a push-pull rod (91), one end of the push-pull rod (91) close to the docking plate (8) is fixedly connected to a connecting plate (93), a groove (95) is provided at the top of the connecting plate (93), a U-shaped clamping plate (96) is clamped together by the groove (95) and the top of the docking plate (8), and a tightening screw (97) is passed through one side of the U-shaped clamping plate (96) and is threadedly connected.

3. A drilling pump for oilfield drilling according to claim 2, characterized in that: The bottom end of the connection plate (93) is fixedly connected to a positioning rod (94), and the bottom end of the docking plate (8) is provided with a positioning hole (81) for inserting the positioning rod (94).

4. The drilling pump for oilfield drilling according to claim 2, characterized in that: The driving assembly comprises a disc (4) located inside the main housing (1); a motor for driving the disc (4) to rotate is fixed outside the main housing (1); a crank connecting rod (5) is rotatably connected to the side of the disc (4); one end of the push-pull rod (91) away from the connecting disc (93) is fixedly connected to a U-shaped seat (92); and the crank connecting rod (5) is rotatably connected to the U-shaped seat (92).

5. The drilling pump for oilfield drilling according to claim 1, characterized in that: The filter assembly comprises a plurality of cross bars (12) fixed to the surface of the end cover (11); the other ends of the plurality of cross bars (12) are fixedly connected to a frame plate (13); a filter screen (14) is provided inside the frame plate (13); a sealing ring (15) is fixedly connected to one side of the frame plate (13) close to the through opening (31); and the sealing ring (15) is in contact with the inner wall of the variable housing (3).

6. The drilling pump for oilfield drilling according to claim 1, characterized in that: A handle is fixedly connected to the side of the piston (6) away from the docking rod (7).

7. The drilling pump for oilfield drilling according to claim 1, characterized in that: A one-way valve (18) is fixedly connected to the middle of the water inlet pipe (16) and the water outlet pipe (17).

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