Split type valve cover small outer pipe oil-drainable sand setting type sand control pump

Abstract

The utility model discloses a split type valve cover small outer pipe oil-drainable sand setting type sand control pump which comprises an outer pipe assembly, one end of the outer pipe assembly is connected with an oil drainer assembly, one end, far away from the outer pipe assembly, of the oil drainer assembly is connected with a lower connector assembly, a pump cylinder assembly is arranged in the outer pipe assembly, and the lower connector assembly is connected with a lower connector assembly. An annular space is formed between the outer pipe assembly and the pump cylinder assembly, a plunger assembly is arranged in the pump cylinder assembly, the end, away from the oil drainage device assembly, of the plunger assembly penetrates through the outer pipe assembly and the pump cylinder assembly, a fixed valve assembly is arranged in the lower connector assembly, and an annular space is formed between the lower connector assembly and the fixed valve assembly. According to the oil-drainable sand setting type sand control pump with the split type valve cover and the small outer pipe, an elevator can be conveniently installed when an oil well pump enters a well, the phenomenon that the valve cover on the upper portion of the plunger is abraded and fractured is avoided, and well liquid in the oil pipe can be drained into a shaft during well lifting operation.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of oil exploitation equipment, and relates to a split type valve cover small outer pipe oil leakage and sand setting type sand prevention pump. BACKGROUND

[0002] Due to the influence of formation structure, the development difficulty of many oilfields in China gradually increases, and more and more sand-containing and gas-containing oil wells exist, the conventional long plunger sand prevention pump can solve the problem of sand jamming of the pump cylinder, but meanwhile, the problems of unable to install a lifting clamp, easy wear and fracture of the upper valve cover of the plunger and easy falling of the outer pipe thread exist, which causes the service life of the oil well pump to be shortened, the difficulty of pump inspection operation to be increased and the cost to be increased, and in the process of pump lifting operation, the crude oil in the oil pipe is brought to the ground by the oil well pump, thereby causing environmental pollution. CONTENT

[0003] The utility model discloses a split type valve cover small outer pipe oil leakage and sand setting type sand prevention pump, which is convenient to install a lifting clamp when the oil well pump is put into a well, avoids the wear and fracture of the upper valve cover of the plunger and can discharge the well fluid in the oil pipe into the well cylinder during well lifting operation.

[0004] The utility model discloses the technical scheme is, split type valve cover small outer pipe oil leakage and sand setting type sand prevention pump, including outer pipe assembly, the one end of outer pipe assembly is connected with the oil drain valve assembly, the other end of oil drain valve assembly is connected with lower joint assembly, the inside of outer pipe assembly is equipped with pump cylinder assembly, and the annular space is formed between the two, the inside of pump cylinder assembly is equipped with plunger assembly, the one end of plunger assembly is away from oil drain valve assembly and penetrates outer pipe assembly, the inside of lower joint assembly is equipped with fixed valve assembly, and the annular space is formed between the two;

[0005] The outer pipe assembly includes an outer pipe provided with external threads at both ends, a first outer pipe connecting collar and a second outer pipe connecting collar are respectively screwed at both ends of the outer pipe, and a step is arranged at the connecting position of the outer pipe and the first outer pipe connecting collar.

[0006] Eight small holes are arranged on the oil drain valve assembly.

[0007] The plunger assembly adopts a split type structure, and the upstream valve of the plunger assembly is arranged in the upper plunger closed valve cover.

[0008] The utility model discloses the characteristics still lie in:

[0009] The other end of the first outer pipe connecting collar is connected with an outer pipe collar, the end of the outer pipe collar away from the outer pipe is provided with an oil pipe collar thread, and the end of the second outer pipe connecting collar away from the outer pipe is connected with the oil drain valve assembly.

[0010] The pump barrel assembly comprises an upper pump barrel and a lower pump barrel which are screwed with each other, the upper pump barrel is arranged at one end away from the lower joint assembly, a sand prevention ring is arranged outside the end of the upper pump barrel away from the lower pump barrel, and the upper pump barrel and the lower pump barrel are arranged in the outer pipe to form an annular space between the upper pump barrel, the lower pump barrel and the outer pipe.

[0011] The oil drain assembly comprises an oil drain body connected with the second outer pipe connecting collar, the end of the lower pump barrel away from the upper pump barrel is connected with the oil drain body, the oil drain body is provided with a central hole along the axis of the oil drain body, eight small holes are uniformly arranged outside the central hole, two symmetrical fan-shaped sand settling grooves are arranged outside the eight small holes, an oil discharge through hole is arranged on the oil drain body, the oil discharge through hole is perpendicular to and communicates with the central cavity of the oil drain body, and a red copper pad and an oil drain pin are respectively arranged in the oil discharge through hole.

[0012] The lower joint assembly comprises a lower joint connecting pipe welded with the oil drain body, a lower joint II is screwed at the end of the lower joint connecting pipe away from the oil drain body, a lower joint I is welded inside the lower joint II, the lower joint I is connected with the fixed valve assembly, and a lower joint plug is screwed at the end of the lower joint II away from the lower joint connecting pipe.

[0013] The fixed valve assembly comprises an upper fixed valve cover screwed with the oil drain body, the upper fixed valve cover is arranged in the lower joint connecting pipe, an upper fixed valve is arranged in the upper fixed valve cover, the end of the upper fixed valve cover away from the oil drain body is screwed with a lower fixed valve cover, the lower fixed valve cover is in contact with and presses the upper fixed valve, a lower fixed valve is arranged in the lower fixed valve cover, and the lower fixed valve cover is screwed with the lower joint I and in contact with and presses the lower fixed valve.

[0014] The plunger assembly comprises an oil outlet joint and an upper plunger closed valve cover which are screwed, the oil outlet joint is arranged at one end away from the lower joint assembly, an upstream moving valve is arranged inside the upper plunger closed valve cover, a plunger joint is screwed at the end of the upper plunger closed valve cover away from the oil outlet joint, the plunger joint is in contact with and presses the upstream moving valve, a plunger is screwed at the other end of the plunger joint, a lower plunger closed valve cover is screwed at the other end of the plunger, a downstream moving valve is arranged inside the lower plunger closed valve cover, and a valve seat pipe plug is screwed at the end of the lower plunger closed valve cover away from the plunger, the valve seat pipe plug is in contact with and presses the downstream moving valve.

[0015] The oil outlet joint is arranged outside the outer pipe assembly, the upper plunger closed valve cover penetrates the outer pipe connecting collar, and the plunger, the lower plunger closed valve cover and the valve seat pipe plug are all arranged inside the pump barrel assembly.

[0016] The plunger is in clearance fit with the upper pump barrel.

[0017] The plunger is in clearance fit with the upper pump barrel.

[0018] (1) The outer pipe assembly of the sand-proof pump has a step between the outer pipe and the first outer pipe connecting collar, which facilitates installation of a lifting clamp during well lowering operation, and the outer pipe is provided with an external thread structure, so that the wall thickness of the outer pipe connecting collar is increased, and the inner pressure of the outer pipe is increased when the pump hanging depth is deepened, thereby avoiding tripping phenomenon;

[0019] (2) The oil drain assembly of the sand-proof pump can make the sand particles sinking in the annular space of the outer pipe assembly and the pump barrel assembly continue to fall from the fan-shaped groove of the oil drain, and then enter the tail pipe connected between the lower joint and the lower joint plug, thereby avoiding the phenomenon that the sand particles continue to deposit on the pump after filling the annular cavity, and preventing the sand from blocking the pump barrel;

[0020] (3) The lower joint assembly of the sand-proof pump, the sand sink groove in the lower joint I and the lower joint II is a fan-shaped long slot, which can achieve the maximum sand sinking effect;

[0021] (4) The plunger assembly of the sand-proof pump, the upper split type valve cover can avoid the phenomenon of valve cover rupture caused by valve ball impact and wear. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a structure schematic view of the split type valve cover small outer pipe oil-draining sand-sinking sand-proof pump of the utility model;

[0023] Figure 2 It is a structure schematic view of the oil drain assembly in the sand-proof pump of the utility model;

[0024] Figure 3 It is a structure schematic view of the oil drain body transverse section in the sand-proof pump of the utility model.

[0025] In the drawing, 1. oil outlet joint, 2. upper plunger closed valve cover, 3. upper movable valve, 4. plunger joint, 5. plunger, 6. lower plunger closed valve cover, 7. lower movable valve, 8. valve seat pipe plug, 9. outer pipe collar, 10. first outer pipe connecting collar, 11. sand-proof ring, 12. upper pump barrel, 13. lower pump barrel, 14. outer pipe, 15. second outer pipe connecting collar, 16. oil drain assembly, 16.1. oil drain body, 16.1.1. center hole, 16.1.2. small hole, 16.1.3. fan-shaped sand sink groove, 16.2. oil drain pin, 16.3. red copper pad, 17. upper fixed valve cover, 18. upper fixed valve, 19. lower fixed valve cover, 20. lower fixed valve, 21. lower joint connecting pipe, 22. lower joint I, 23. lower joint II, 24. lower joint plug. DETAILED DESCRIPTION

[0026] The utility model will be described in detail in combination with the drawings and specific implementation.

[0027] The split valve cover small outer pipe can leak oil and sand pump, as shown in Figure 1 The outer pipe assembly includes an oil leak assembly 16 connected at one end of the outer pipe assembly, a lower joint assembly connected at the other end of the oil leak assembly 16, a pump barrel assembly arranged inside the outer pipe assembly, an annular space formed between the outer pipe assembly and the pump barrel assembly, a plunger assembly arranged inside the pump barrel assembly, the plunger assembly penetrating through the outer pipe assembly and the pump barrel assembly at the end away from the oil leak assembly 16, a fixed valve assembly arranged inside the lower joint assembly, and an annular space formed between the lower joint assembly and the fixed valve assembly.

[0028] The outer pipe assembly includes an outer pipe 14, the outer pipe 14 is provided with external threads at both ends, and the outer pipe 14 is connected with a first outer pipe connecting collar 10 and a second outer pipe connecting collar 15 at both ends, respectively, so as to increase the threaded connection strength, avoid the threaded decoupling phenomenon caused by the expansion of the outer pipe threads when the pipe string pressure becomes larger with the increase of the pump hanging depth, and facilitate the installation of the elevator during the oil field downhole operation.

[0029] The other end of the first outer pipe connecting collar 10 is connected with an outer pipe collar 9, the outer pipe collar 9 is provided with a tubing collar thread at the end away from the outer pipe 14 for connecting the tubing, and the other end of the second outer pipe connecting collar 15 is connected with the oil leak assembly 16.

[0030] The pump barrel assembly includes an upper pump barrel 12 and a lower pump barrel 13 which are screwed with each other, the upper pump barrel 12 is arranged at the end away from the lower joint assembly, the outer side of the end of the upper pump barrel 12 away from the lower pump barrel 13 is sleeved with a sand prevention ring 11, the outer side has three support ribs, the upper pump barrel 12 and the lower pump barrel 13 are arranged in the outer pipe 14, and the annular space is formed between the upper pump barrel 12, the lower pump barrel 13 and the outer pipe 14.

[0031] As shown in Figure 2 The oil leak assembly 16 includes an oil leak body 16.1 connected with the second outer pipe connecting collar 15, the end of the lower pump barrel 13 away from the upper pump barrel 12 is connected with the oil leak body 16.1, as shown in Figure 3 The oil leak body 16.1 is provided with a central hole 16.1.1 along the axis, eight small holes 16.1.2 are uniformly arranged on the outer side of the central hole 16.1.1, two fan-shaped sand settling grooves 16.1.3 are symmetrically arranged along the outer side of the eight small holes 16.1.2, the eight small holes 16.1.2 increase the oil inlet passage area and improve the pump efficiency, and the two fan-shaped sand settling grooves 16.1.3 are used for sinking the sand particles in the upper cavity into the lower cavity. The oil leak body 16.1 is provided with an oil discharge through hole which is perpendicular to and communicates with the central cavity of the oil leak body 16.1, and the oil discharge through hole is respectively provided with a red copper pad 16.3 and an oil leak pin 16.2.

[0032] The lower joint assembly comprises a lower joint connecting pipe 21 welded with the oil drain body 16.1, a lower joint II 23 screwed at one end of the lower joint connecting pipe 21 away from the oil drain body 16.1, a lower joint I 22 welded inside the lower joint II 23, the lower joint I 22 connected with the fixed valve assembly, and a lower joint plug cap 24 screwed at one end of the lower joint II 23 away from the lower joint connecting pipe 21.

[0033] The fixed valve assembly comprises an upper fixed valve cover 17 screwed with the oil drain body 16.1, the upper fixed valve cover 17 arranged inside the lower joint connecting pipe 21, an upper fixed valve 18 arranged inside the upper fixed valve cover 17, a lower fixed valve cover 19 screwed at one end of the upper fixed valve cover 17 away from the oil drain body 16.1, the lower fixed valve cover 19 in contact with and pressing the upper fixed valve 18, a lower fixed valve 20 arranged inside the lower fixed valve cover 19, and the lower fixed valve cover 19 screwed with the lower joint I 22, the lower joint I 22 in contact with and pressing the lower fixed valve 20.

[0034] The plunger assembly adopts a split structure, and comprises an oil outlet joint 1 and an upper plunger closed valve cover 2 connected in a threaded mode, the oil outlet joint 1 arranged at one end away from the lower joint assembly, the upper plunger closed valve cover 2 internally provided with an upper movable valve 3, the upper plunger closed valve cover 2 screwed at one end away from the oil outlet joint 1 with a plunger joint 4, the plunger joint 4 in contact with and pressing the upper movable valve 3, the plunger joint 4 screwed at the other end with a plunger 5, the plunger 5 screwed at the other end with a lower plunger closed valve cover 6, the lower plunger closed valve cover 6 internally provided with a lower movable valve 7, and the lower plunger closed valve cover 6 screwed at one end away from the plunger 5 with a valve seat pipe plug 8, the valve seat pipe plug 8 in contact with and pressing the lower movable valve 7.

[0035] The oil outlet joint 1 is arranged outside the outer pipe assembly, the upper plunger closed valve cover 2 penetrates the outer pipe coupling 9, the plunger 5, the lower plunger closed valve cover 6 and the valve seat pipe plug 8 are all arranged inside the pump cylinder assembly, and the plunger 5 is in clearance fit with the upper pump cylinder 12.

[0036] The upper movable valve 3 is arranged inside the upper plunger closed valve cover 2, so that the fracture of the oil outlet joint 1 caused by long-term wear of the valve ball is avoided.

[0037] The working process of the utility model is as follows:

[0038] Before the downhole operation, the lower joint plug cap 24 is removed, the plunger assembly is pulled out, and the lower joint plug cap 24 is installed at the lower end of the oil pipe.

[0039] During the downhole operation, a plurality of oil pipes are connected in series through the oil pipe coupling and then lowered into the well, the elevator is installed on the step between the outer pipe connecting coupling 10 and the outer pipe 14, the whole pump except the plunger assembly is lowered into the wellbore and sent to the designated position in the wellbore together with the oil pipe, and finally the plunger assembly is lowered into the well together with the pumping rod from the oil pipe, the anti-collision distance is adjusted, and the oil pumping operation is performed.

[0040] When the well is pulled, the plunger assembly is pulled out of the well first, then a φ19 smooth rod is dropped into the well to hit the oil release pin 16.2 of the oil release assembly 16, so that the crude oil in the tubing flows back into the wellbore, ensuring that the ground environment is not polluted during the well pulling operation.

[0041] The split valve cover small outer pipe oil release sand settling type sand prevention pump adds an outer pipe and an oil release device on the basis of the long plunger sand prevention pump, can make the sand particles sucked into the pump sink into the tail pipe, avoids the risk of pump jamming, and avoids environmental pollution when the well is pulled.

[0042] Example 1

[0043] The split valve cover small outer pipe oil release sand settling type sand prevention pump, comprising an outer pipe assembly, one end of the outer pipe assembly is connected with an oil release assembly 16, the other end of the oil release assembly 16 is connected with a lower joint assembly, the outer pipe assembly is provided with a pump cylinder assembly inside, and an annular space is formed between the two;

[0044] The outer pipe assembly comprises an outer pipe 14 provided with external threads at both ends, and the outer pipe 14 is respectively screwed with a first outer pipe connecting collar 10 and a second outer pipe connecting collar 15 at both ends.

[0045] Eight small holes are formed in the oil release assembly 16.

[0046] The plunger assembly adopts a split structure, and the upstream valve 3 of the plunger assembly is located inside the upper plunger closed valve cover 2.

[0047] Example 2

[0048] The split valve cover small outer pipe oil release sand settling type sand prevention pump, comprising an outer pipe assembly, one end of the outer pipe assembly is connected with an oil release assembly 16, the other end of the oil release assembly 16 is connected with a lower joint assembly, the outer pipe assembly is provided with a pump cylinder assembly inside, and an annular space is formed between the two;

[0049] The outer pipe assembly comprises an outer pipe 14, the outer pipe 14 is provided with outer threads at both ends, and the outer pipe 14 is connected with a first outer pipe connecting collar 10 and a second outer pipe connecting collar 15 at both ends respectively, so that the threaded connection strength can be increased, and when the pump hanging depth is increased, the pipe string pressure becomes large, and the thread tripping phenomenon caused by expansion of the outer pipe thread is avoided; a step is arranged at the connecting position of the outer pipe 14 and the first outer pipe connecting collar 10, so that the installation of the elevator during the oil field downhole operation process is facilitated.

[0050] Eight small holes are arranged on the oil drain assembly 16.

[0051] The plunger assembly adopts a split structure, and the upstream movable valve 3 of the plunger assembly is arranged in the upper plunger closed valve cover 2.

[0052] Example 3

[0053] The split valve cover small outer pipe can drain oil and sand, and the sand control pump comprises an outer pipe assembly, the outer pipe assembly is connected with an oil drain assembly 16 at one end, the oil drain assembly 16 is connected with a lower joint assembly at the other end, the outer pipe assembly is internally provided with a pump barrel assembly, and an annular space is formed between the two, the pump barrel assembly is internally provided with a plunger assembly, one end of the plunger assembly away from the oil drain assembly 16 penetrates through the outer pipe assembly, the lower joint assembly is internally provided with a fixed valve assembly, and an annular space is formed between the two.

[0054] The outer pipe assembly comprises an outer pipe 14 provided with outer threads at both ends, the outer pipe 14 is screwed with a first outer pipe connecting collar 10 and a second outer pipe connecting collar 15 at both ends respectively, and a step is arranged at the connecting position of the outer pipe 14 and the first outer pipe connecting collar 10.

[0055] Eight small holes are arranged on the oil drain assembly 16.

[0056] The plunger assembly adopts a split structure, and the upstream movable valve 3 of the plunger assembly is arranged in the upper plunger closed valve cover 2.

[0057] The pump barrel assembly comprises an upper pump barrel 12 and a lower pump barrel 13 which are screwed with each other, the upper pump barrel 12 is arranged at one end away from the lower joint assembly, a sand control ring 11 is arranged outside one end of the upper pump barrel 12 away from the lower pump barrel 13, and three supporting ribs are arranged outside, the upper pump barrel 12 and the lower pump barrel 13 are arranged in the outer pipe 14, and an annular space is formed between the upper pump barrel 12, the lower pump barrel 13 and the outer pipe 14.

[0058] Example 4

[0059] The split valve cover small outer pipe can leak oil and sand type sand control pump, including outer pipe assembly, one end of the outer pipe assembly is connected with the oil drain assembly 16, the other end of the oil drain assembly 16 is connected with the lower joint assembly, the outer pipe assembly is provided with the pump cylinder assembly inside, and the annular space is formed between the two; the plunger assembly is arranged inside the pump cylinder assembly, one end of the plunger assembly away from the oil drain assembly 16 penetrates the outer pipe assembly, the lower joint assembly is provided with the fixed valve assembly inside, and the annular space is formed between the two;

[0060] The outer pipe assembly includes the outer pipe 14 provided with external threads at both ends, the first outer pipe connecting collar 10 and the second outer pipe connecting collar 15 are respectively screwed at both ends of the outer pipe 14, and a step is arranged at the connecting position of the outer pipe 14 and the first outer pipe connecting collar 10;

[0061] Eight small holes are arranged on the oil drain assembly 16;

[0062] The plunger assembly adopts a split structure, and the upstream movable valve 3 of the plunger assembly is arranged inside the upper plunger closed valve cover 2.

[0063] As shown in Figure 2 The oil drain assembly 16 includes the oil drain body 16.1 connected with the second outer pipe connecting collar 15, one end of the lower pump cylinder 13 away from the upper pump cylinder 12 is connected with the oil drain body 16.1, as shown in Figure 3 The oil drain body 16.1 is provided with a central hole 16.1.1 along the axis, eight small holes 16.1.2 are uniformly arranged outside the central hole 16.1.1, two fan-shaped sand grooves 16.1.3 are symmetrically arranged outside the eight small holes 16.1.2, the eight small holes 16.1.2 are used to increase the oil inlet channel area and improve the pump efficiency, and the two fan-shaped sand grooves 16.1.3 are used to sink the sand in the upper cavity into the lower cavity. The oil drain body 16.1 is provided with an oil discharge hole, the oil discharge hole is perpendicular to and communicates with the central cavity of the oil drain body 16.1, and the oil discharge hole is respectively provided with a red copper pad 16.3 and an oil drain pin 16.2.

[0064] Example 5

[0065] The split valve cover small outer pipe can leak oil and sand type sand control pump, including outer pipe assembly, one end of the outer pipe assembly is connected with the oil drain assembly 16, the other end of the oil drain assembly 16 is connected with the lower joint assembly, the outer pipe assembly is provided with the pump cylinder assembly inside, and the annular space is formed between the two; the plunger assembly is arranged inside the pump cylinder assembly, one end of the plunger assembly away from the oil drain assembly 16 penetrates the outer pipe assembly, the lower joint assembly is provided with the fixed valve assembly inside, and the annular space is formed between the two;

[0066] The outer pipe assembly includes the outer pipe 14 provided with external threads at both ends, the first outer pipe connecting collar 10 and the second outer pipe connecting collar 15 are respectively screwed at both ends of the outer pipe 14, and a step is arranged at the connecting position of the outer pipe 14 and the first outer pipe connecting collar 10;

[0067] The oil drain assembly 16 is provided with eight small holes;

[0068] The plunger assembly is of a split structure, and the upstream valve 3 of the plunger assembly is inside the upper plunger closed valve cover 2.

[0069] The lower joint assembly comprises a lower joint connecting pipe 21 welded with the oil drain body 16.1, a lower joint II 23 screwed at an end of the lower joint connecting pipe 21 away from the oil drain body 16.1, a lower joint I 22 welded inside the lower joint II 23, the lower joint I 22 connected with the fixed valve assembly, and a lower joint plug 24 screwed at an end of the lower joint II 23 away from the lower joint connecting pipe 21.

[0070] The fixed valve assembly comprises an upper fixed valve cover 17 screwed with the oil drain body 16.1, the upper fixed valve cover 17 arranged inside the lower joint connecting pipe 21, an upper fixed valve 18 arranged inside the upper fixed valve cover 17, a lower fixed valve cover 19 screwed at an end of the upper fixed valve cover 17 away from the oil drain body 16.1, the lower fixed valve cover 19 in contact with and pressing the upper fixed valve 18, a lower fixed valve 20 arranged inside the lower fixed valve cover 19, and the lower fixed valve cover 19 screwed with the lower joint I 22, the lower joint I 22 in contact with and pressing the lower fixed valve 20.

[0071] Example 6

[0072] The split valve cover small outer pipe oil-draining sand-removing sand-proof pump comprises an outer pipe assembly, one end of the outer pipe assembly is connected with an oil drain assembly 16, the other end of the oil drain assembly 16 is connected with a lower joint assembly, the outer pipe assembly is arranged with a pump cylinder assembly, and an annular space is formed between the outer pipe assembly and the pump cylinder assembly, the pump cylinder assembly is arranged with a plunger assembly inside, one end of the plunger assembly away from the oil drain assembly 16 penetrates through the outer pipe assembly, the lower joint assembly is arranged with a fixed valve assembly inside, and an annular space is formed between the lower joint assembly and the fixed valve assembly.

[0073] The outer pipe assembly comprises an outer pipe 14 provided with external threads at two ends, the outer pipe 14 is respectively screwed with a first outer pipe connecting collar 10 and a second outer pipe connecting collar 15 at two ends, and the outer pipe 14 is provided with a step at a position connected with the first outer pipe connecting collar 10.

[0074] The oil drain assembly 16 is provided with eight small holes;

[0075] The plunger assembly adopts a split structure, and comprises an oil outlet joint 1 and an upper plunger closed valve cover 2 which are threadedly connected. The oil outlet joint 1 is arranged at one end away from the lower joint assembly. The upper plunger closed valve cover 2 is internally provided with an upstream movable valve 3. The upper plunger closed valve cover 2 is threadedly connected with a plunger joint 4 at an end away from the oil outlet joint 1. The plunger joint 4 is in contact with and presses the upstream movable valve 3. The plunger joint 4 is threadedly connected with a plunger 5 at the other end. The plunger 5 is threadedly connected with a lower plunger closed valve cover 6 at the other end. The lower plunger closed valve cover 6 is internally provided with a downstream movable valve 7. The lower plunger closed valve cover 6 is threadedly connected with a valve seat pipe plug 8 at an end away from the plunger 5. The valve seat pipe plug 8 is in contact with and presses the downstream movable valve 7.

[0076] The oil outlet joint 1 is arranged outside the outer pipe assembly. The upper plunger closed valve cover 2 penetrates the outer pipe joint 9. The plunger 5, the lower plunger closed valve cover 6 and the valve seat pipe plug 8 are all arranged inside the pump cylinder assembly. The plunger 5 is in clearance fit with the upper pump cylinder 12.

[0077] The upstream movable valve 3 is arranged inside the upper plunger closed valve cover 2, thereby avoiding the long-term wear and tear of the valve ball on the oil outlet joint 1 and the resulting breakage.

Claims

1. A split valve cover small outer tube oil leakage sand type sand prevention pump, characterized in that, The outer tube assembly is connected with the oil drain assembly (16) at one end, and the other end is connected with the lower joint assembly, the pump cylinder assembly is arranged in the outer tube assembly, and an annular space is formed between the pump cylinder assembly and the outer tube assembly, the plunger assembly is arranged in the pump cylinder assembly, the plunger assembly penetrates through the outer tube assembly away from the oil drain assembly (16), and the fixed valve assembly is arranged in the lower joint assembly, and an annular space is formed between the fixed valve assembly and the lower joint assembly. The outer tube assembly comprises an outer tube (14) provided with external threads at both ends, and the outer tube (14) is respectively screwed with a first outer tube connecting collar (10) and a second outer tube connecting collar (15) at both ends. Eight small holes are formed in the oil drain assembly (16). The plunger assembly adopts a split structure, and the upstream valve (3) of the plunger assembly is arranged in the upper plunger closed valve cover (2).

2. The split valve cover small outer pipe oil leakage sand type sand prevention pump according to claim 1, characterized in that, The first outer tube connecting collar (10) is connected with the outer tube collar (9) at the other end, the outer tube collar (9) is provided with a tubing collar thread at the end away from the outer tube (14), and the second outer tube connecting collar (15) is connected with the oil drain assembly (16) at the end away from the outer tube (14).

3. The split valve cover small outer tube oil leakage sand type sand prevention pump according to claim 1, characterized in that, The pump cylinder assembly comprises an upper pump cylinder (12) and a lower pump cylinder (13) which are screwed with each other, the upper pump cylinder (12) is arranged at the end away from the lower joint assembly, the outer side of the end of the upper pump cylinder (12) away from the lower pump cylinder (13) is sleeved with a sand prevention ring (11), and the upper pump cylinder (12) and the lower pump cylinder (13) are arranged in the outer tube (14), and an annular space is formed between the upper pump cylinder (12), the lower pump cylinder (13) and the outer tube (14).

4. The split valve cover small outer tube oil leakage sand type sand prevention pump according to claim 3, characterized in that, The oil drain assembly (16) comprises an oil drain body (16.1) connected with the second outer tube connecting collar (15), the end of the lower pump cylinder (13) away from the upper pump cylinder (12) is connected with the oil drain body (16.1), the oil drain body (16.1) is provided with a central hole (16.1.1) along the axis, eight small holes (16.1.2) are uniformly formed in the outer side of the central hole (16.1.1), two fan-shaped sand setting grooves (16.1.3) are symmetrically arranged along the outer side of the eight small holes (16.1.2), an oil discharge through hole is formed in the oil drain body (16.1), the oil discharge through hole is perpendicular to and communicates with the central cavity of the oil drain body (16.1), and a red copper pad (16.3) and an oil drain pin (16.2) are respectively arranged in the oil discharge through hole. The lower joint assembly comprises a lower joint connecting pipe (21) welded with the oil drain body (16.1), the lower joint connecting pipe (21) is screwed with a lower joint II (23) at the end away from the oil drain body (16.1), the lower joint I (22) is welded in the lower joint II (23), the lower joint I (22) is connected with the fixed valve assembly, and the lower joint II (23) is screwed with a lower joint plug (24) at the end away from the lower joint connecting pipe (21).

5. The split valve cover small outer tube oil leakage sand type sand prevention pump according to claim 4, characterized in that, ​ 6. The split valve cover small outer pipe oil leakage and sand type sand prevention pump according to claim 5, characterized in that, The fixed valve assembly comprises an upper fixed valve cover (17) screwed with the oil drain body (16.1), the upper fixed valve cover (17) is arranged in the lower joint connecting pipe (21), the upper fixed valve cover (17) is provided with an upper fixed valve (18), the end of the upper fixed valve cover (17) away from the oil drain body (16.1) is screwed with a lower fixed valve cover (19), the lower fixed valve cover (19) is in contact with and presses the upper fixed valve (18), the lower fixed valve cover (19) is provided with a lower fixed valve (20), the lower fixed valve cover (19) is screwed with a lower joint I (22), the lower joint I (22) is in contact with and presses the lower fixed valve (20).

7. The split valve cover small outer tube oil leakage sand type sand prevention pump according to claim 6, characterized in that, The plunger assembly comprises a threaded oil outlet joint (1) and an upper plunger closed valve cover (2), the oil outlet joint (1) is arranged at an end away from the lower joint assembly, the upper plunger closed valve cover (2) is internally provided with an upper movable valve (3), the end of the upper plunger closed valve cover (2) away from the oil outlet joint (1) is screwed with a plunger joint (4), the plunger joint (4) is in contact with and presses the upper movable valve (3), the other end of the plunger joint (4) is screwed with a plunger (5), the other end of the plunger (5) is screwed with a lower plunger closed valve cover (6), the lower plunger closed valve cover (6) is internally provided with a lower movable valve (7), the end of the lower plunger closed valve cover (6) away from the plunger (5) is screwed with a valve seat pipe plug (8), the valve seat pipe plug (8) is in contact with and presses the lower movable valve (7); The oil outlet joint (1) is arranged outside the outer pipe assembly, the upper plunger closed valve cover (2) penetrates the outer pipe coupling (9), the plunger (5), the lower plunger closed valve cover (6) and the valve seat pipe plug (8) are all arranged inside the pump cylinder assembly.

8. The split valve cover small outer tube oil leakage sand type sand prevention pump according to claim 7, characterized in that, The plunger (5) is in clearance fit with the upper pump cylinder (12).

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