Traveling valve and forced closing of anti-stuck oil pump

Abstract

The present invention discloses a floating valve and a forced-closing anti-stuck oil pump. The floating valve and the forced-closing anti-stuck oil pump provided by the present invention are characterized in that the closing of the floating valve relies on the impact of the reverse jet of the suction liquid; the closing of the fixed valve relies on the elastic force of the push rod, and a mechanical sand and wax removal function is added; the forced-closing anti-stuck oil pump using the floating valve and the fixed valve overcomes the shortcomings of the existing inclined well pump, improves the pump efficiency and service life, and reduces the oil production cost.

Description

Technical Field

[0001] The invention belongs to the field of oil field production equipment, and in particular relates to a traveling valve and a forced closing anti-stuck oil pump. Background Art

[0002] With the continuous development of oil fields and the continuous advancement of drilling technology, the application of highly deviated wells and horizontal wells is becoming more and more extensive. Since ordinary oil pumps cannot work properly in highly deviated wells and horizontal wells, inclined well oil pumps have become the main tool in the inclined well mining process. Existing inclined well oil pumps generally use spring reset to push the valve ball to force closing. Although this method solves the problem of valve ball closing lag, it still has the following defects, resulting in a short service life of the inclined well oil pump and frequent oil well operations.

[0003] 1. The traveling valve on the plunger assembly is limited by size, and the oil flow channel is already narrow. After adding the return spring, the oil flow channel is further compressed, causing the flow resistance at this location to increase exponentially, seriously affecting the pump efficiency.

[0004] 2. Due to size limitations, the floating valve return spring is designed with a small mid-diameter, a thin wire diameter, and a high working stress of the spring. In addition, the spring is located inside the liquid flow area and is constantly washed by the high-speed oil flow through the narrow flow channel. In this complex environment, the spring is quickly damaged and fails, resulting in failure of the valve ball to close.

[0005] 3. The fixed valve has ample space and the above-mentioned problem does not exist in the design of the return spring. However, due to the large cross-sectional area of ​​the fixed valve flow channel and the low flow velocity, the oil flow through this area has small sand carrying and flushing capabilities. In addition, the valve ball is in a horizontal working state, which leads to the easy formation of sand deposition and waxing in this area. When the accumulation reaches a certain level, the valve ball is stuck and cannot be closed. This is also one of the main reasons for the frequent failure of inclined well pumps. Summary of the invention

[0006] In view of the defects existing in the above-mentioned prior art, the object of the present invention is to provide a traveling valve and a forced closing anti-stuck oil pump.

[0007] The objectives of the present invention are achieved through the following technical solutions.

[0008] A traveling valve, comprising:

[0009] Traveling valve cover,

[0010] The traveling valve core and the traveling valve seat are arranged side by side in the traveling valve cover. The traveling valve core includes a section A and a section B. The section A is arranged adjacent to the traveling valve seat, and the section B is arranged away from the traveling valve seat. There is a gap between the section A of the traveling valve core and the traveling valve seat.

[0011] and a traveling valve ball movably arranged in section A of the traveling valve core;

[0012] The B section of the floating valve core is provided with a tapered flow passage which is larger on the outside and smaller on the inside from the outside to the inside.

[0013] The cone angle of the conical flow channel is 8° to 15°, and the flow area of ​​the small end is 0.52 to 0.62 times the projection area of ​​the floating valve ball.

[0014] The B section of the floating valve core is provided with a Venturi flow channel.

[0015] A forced closing anti-stuck oil pump, comprising:

[0016] A pump barrel assembly, the pump barrel assembly comprising an upper coupling, a pump barrel, a lower coupling and a fixed valve connected in sequence from top to bottom;

[0017] The plunger assembly includes an oil outlet joint, an upstream movable valve, an upstream movable valve joint, a plunger, a downstream movable valve joint, a downstream movable valve and an oil inlet joint, which are sequentially connected from top to bottom, and the upstream movable valve and the downstream movable valve are movable valves of the same structure;

[0018] The plunger assembly is sleeved in the pump barrel assembly.

[0019] The fixed valve comprises:

[0020] Fixed valve connector,

[0021] The embedded valve cover and the fixed valve seat are arranged side by side in the fixed valve joint, the two ends of the embedded valve cover are C end and D end respectively, the C end is arranged adjacent to the fixed valve seat, and the D end is arranged away from the fixed valve seat, the C end of the embedded valve cover is tightly against the fixed valve seat, and the embedded valve cover is provided with a flow hole penetrating the end surface of the D end of the embedded valve cover,

[0022] The fixed valve ball is movably arranged in the flow chamber of the embedded valve cover.

[0023] And a push rod slidingly penetrating the end surface of the embedded valve cover at the D end, the two ends of the push rod are respectively the E end and the F end, the E end is arranged adjacent to the fixed valve seat, and the F end is arranged away from the fixed valve seat, the E end of the push rod is provided with a descaling ring, and the fixed valve ball is located between the descaling ring and the C end of the embedded valve cover; a telescopic part is sleeved on the push rod, and the telescopic part is located between the inner end surface of the D end of the embedded valve cover and the descaling ring.

[0024] The push rod comprises a rod body and supporting ribs, and the descaling ring is arranged on the rod body through the supporting ribs; a sharp blade is arranged at the end of the descaling ring; and the projection area of ​​the descaling ring is larger than the projection area of ​​the fixed valve ball.

[0025] When the fixed valve is closed, the end surface of the F end of the push rod and the outer end surface of the D end of the embedded valve cover are located in the same plane.

[0026] The beneficial effects of the present invention are as follows: the floating valve and the forced closing anti-stuck oil pump provided by the present invention, the closing of the floating valve relies on the reverse jet impact of the suction liquid; the closing of the fixed valve relies on the elastic force of the push rod, and adds a mechanical sand removal and wax breaking function; the forced closing anti-stuck oil pump using the floating valve and the fixed valve overcomes the shortcomings of the existing inclined well pumps, improves the pump efficiency and service life, and reduces the oil production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural diagram of a traveling valve.

[0028] Figure 2 yes Figure 1 Schematic diagram of the structure of the mid-stream moving valve core.

[0029] Figure 3 It is another structural schematic diagram of the floating valve core.

[0030] Figure 4 It is another structural schematic diagram of the floating valve core.

[0031] Figure 5 It is a schematic diagram of the structure when the fixed valve is closed.

[0032] Figure 6 It is a structural diagram when the fixed valve is open.

[0033] Figure 7 It is a schematic diagram of the structure of the embedded valve cover.

[0034] Figure 8 It is the front view of the fixed valve top rod.

[0035] Fig. 9 It is a side view of the fixed valve top stem.

[0036] Fig.10 It is a schematic diagram of the structure of forcibly closing the anti-stuck oil pump.

[0037] In the figure, 10 is a floating valve, 11 is a floating valve cover, 12 is a floating valve core, 13 is a floating valve ball, 14 is a floating valve seat, 20 is a fixed valve, 21 is a fixed valve joint, 22 is a fixed valve seat, 23 is a fixed valve ball, 24 is a push rod, 241 is a rod body, 242 is a supporting rib, 25 is a descaling ring, 26 is an embedded valve cover, 27 is a telescopic member, 30 is a pump barrel assembly, 31 is an upper coupling, 32 is a pump barrel, 33 is a lower coupling, 40 is a plunger assembly, 41 is an oil outlet joint, 42 is an upper floating valve joint, 43 is a plunger, 44 is a downstream floating valve joint, 45 is an oil inlet joint, 101 is an upper floating valve, and 102 is a downstream floating valve. DETAILED DESCRIPTION

[0038] like Figures 1 to 4As shown, a traveling valve 10 includes a traveling valve cover 11, a traveling valve core 12, a traveling valve seat 14 and a traveling valve ball 13. In order to more clearly illustrate the traveling valve of the present invention, as shown in FIG. Figures 2 to 4 As shown, the present invention divides the floating valve core 12 into section A and section B by taking the dotted line in the figure as a dividing line. It should be noted that this is not a limitation of the technical solution of the present invention.

[0039] The traveling valve core 12 and the traveling valve seat 14 are arranged side by side in the traveling valve housing 11. The traveling valve core 12 includes a section A and a section B. The section A is arranged adjacent to the traveling valve seat 14, and the section B is arranged away from the traveling valve seat 14. There is a gap between the section A of the traveling valve core 12 and the traveling valve seat 14. A step is arranged on the traveling valve housing 11, and the step is arranged in the above gap. The traveling valve ball 13 is movably arranged in the section A of the traveling valve core 12, and the traveling valve ball 13 can jump freely in the cavity enclosed by the section A of the traveling valve core 12 and the traveling valve seat 14. When the traveling valve 10 is closed, the traveling valve ball 13 is seated on the sealing surface of the traveling valve seat 14.

[0040] The B section of the floating valve core 12 is provided with a tapered flow passage which is larger outside and smaller inside from outside to inside, and the tapered angle of the tapered flow passage is Y.

[0041] Furthermore, the cone angle Y of the tapered flow channel is 8° to 15°, and the flow area of ​​the small end is 0.52 to 0.62 times the projection area of ​​the floating valve ball 13 .

[0042] Furthermore, the B section of the floating valve core 12 is provided with a Venturi flow channel. Figure 1 and Figure 2 shown.

[0043] When the traveling valve 10 is in use, the B section of the traveling valve core 12 faces upward and the A section faces downward; when the oil pump is in the upward stroke, the plunger assembly starts to move upward, and the suction fluid in the oil pipe on the pump flows in the opposite direction, passing through the tapered flow channel of the traveling valve core 12 with a taper angle Y, and the instantaneous linear velocity of the fluid increases greatly, generating a jet, which sprays and impacts the traveling valve ball 13, pushing the traveling valve ball 13 to close in advance. When the oil pump is in the downward stroke, the plunger assembly changes from upward to downward, the pressure in the pump chamber increases, and the traveling valve ball 13 is pushed open, and the oil enters the oil pipe on the pump through the channel in the plunger assembly.

[0044] like Figures 5 to 9 As shown, a fixed valve 20 includes a fixed valve joint 21, an embedded valve cover 26, a fixed valve seat 22, a fixed valve ball 23, a push rod 24 and a descaling ring 25. In order to more clearly illustrate the fixed valve 20 of the present invention, as shown in FIG. Figure 7 and Figure 8As shown, the present invention divides the two ends of the embedded valve cover 26 into a C end and a D end, and the D end is an end face with a flow hole, and the flow hole is used for oil circulation; the two ends of the push rod 24 are divided into an E end and an F end. It should be noted that this is not a limitation of the technical solution of the present invention.

[0045] A step for limiting the fixed valve seat 22 is provided in the fixed valve joint 21, and the embedded valve cover 26 and the fixed valve seat 22 are arranged side by side in the fixed valve joint 21. The two ends of the embedded valve cover 26 are respectively the C end and the D end, the C end is arranged adjacent to the fixed valve seat 22, and the D end is arranged away from the fixed valve seat 22. The C end of the embedded valve cover 26 is pressed against the fixed valve seat 22 to press the fixed valve seat 22 into the fixed valve joint 21; the embedded valve cover 26 is provided with a flow hole that passes through the end face of the D end of the embedded valve cover 26, and the flow hole is used for the circulation of oil; the fixed valve ball 23 is movably arranged in the flow cavity of the embedded valve cover 26, and the fixed valve ball 23 can jump freely along the axial direction in the flow cavity.

[0046] The embedded valve housing 26 is also provided with a push rod 24 that slides through the end face of the embedded valve housing 26D. The push rod 24 can slide axially in the flow cavity of the embedded valve housing 26. The two ends of the push rod 24 are respectively the E end and the F end. The E end is arranged adjacent to the fixed valve seat 22, and the F end is arranged away from the fixed valve seat 22. The E end of the push rod 24 is provided with a descaling ring 25. The outer circle of the descaling ring 25 is slidably matched with the inner cavity of the embedded valve housing 26. The fixed valve ball 23 is located between the descaling ring 25 and the C end of the embedded valve housing 26. The push rod 24 is sleeved with a telescopic member 27. The telescopic member 27 is located between the inner end face of the D end of the embedded valve housing 26 and the descaling ring 25. The telescopic member 27 is preferably a compression spring. The fixed valve ball 23 can be pushed to be seated on the sealing surface of the fixed valve seat 22 by the elastic force of the push rod 24 and the telescopic member 27.

[0047] Further, the push rod 24 includes a rod body 241 and a support rib 242, the rod body 241 coincides with the center line of the fixed valve ball 23, and the descaling ring 25 is arranged on the rod body 241 through the support rib 242. A sharp blade is arranged at the lower end of the descaling ring 25, and the lower end of the descaling ring 25 mentioned here refers to the lower part where the fixed valve 20 is located when in use. The projection area of ​​the descaling ring 25 is larger than the projection area of ​​the fixed valve ball 23, and the spherical surface of the fixed valve ball 23 contacts the E end of the push rod 24.

[0048] Furthermore, when the fixed valve 20 is closed, the F-end end surface of the push rod 24 and the D-end outer end surface of the embedded valve cover 26 are located in the same plane; when the fixed valve 20 is opened, the F-end end surface of the push rod 24 protrudes from the D-end outer end surface of the embedded valve cover 26, and the protruding height is equal to the jump height of the fixed valve ball 23.

[0049] When the fixed valve 20 is in use, the D end of the embedded valve cover 26 faces upward and the C end faces downward; when the oil pump is in the upstroke, the plunger assembly starts to move upward, the fixed valve ball 23 opens under the pressure of the sinking degree, and the oil enters the pump cavity. The jump height of the fixed valve ball 23 is equal to the height of the outer end surface of the D end of the embedded valve cover 26 protruding from the F end of the push rod 24. When the oil pump is in the downstroke, the plunger assembly changes from upward to downward, the fixed valve 20 stops taking in liquid, and the push rod 24 pushes the fixed valve ball 23 to close in advance under the elastic force of the telescopic member 27.

[0050] When the sand deposition and wax deposition in the fixed valve 20 are serious, resulting in the fixed valve ball 23 being unable to be completely closed, the plunger assembly can be lowered to form a collision pump. The lower end surface of the lower part of the plunger assembly presses the part of the push rod 24 protruding from the outer end surface of the D end of the embedded valve cover 26, mechanically pushing the fixed valve ball 23 to be completely closed. At the same time, the descaling ring 25 on the push rod 24 can scrape off the accumulated sand and wax in the embedded valve cover 26. When pumping again, the sand and wax will be discharged out of the pump along with the suction liquid, completing the sand cleaning and wax breaking functions.

[0051] The above-mentioned fixed valve 20 adopts a compression spring (telescopic member 27) plus a push rod 24 structure. The elastic force of the above-mentioned compression spring is less than 0.5kg. However, when the fixed valve ball 23 is opened, the fixed valve ball 23 will push the push rod 24 so that the end of the push rod 24F protrudes from the outer end surface of the embedded valve cover 26D. If wax deposition and sand accumulation occur and the fixed valve ball 23 is stuck, a pump collision operation can be performed (i.e., the sucker rod column is lowered to allow the lower end surface of the plunger assembly to contact the outer end surface of the embedded valve cover 26D). With the help of the thousands of kilograms of pressure generated by the sucker rod column, the push rod 24 and the descaling ring 25 are pushed to easily and completely break the wax and clean the sand.

[0052] like Fig.10 As shown, a forced-closing anti-stuck oil pump uses the above-mentioned traveling valve 10 and fixed valve 20. The forced-closing anti-stuck oil pump includes a pump barrel assembly 30 and a plunger assembly 40. The plunger assembly 40 is sleeved in the pump barrel assembly 30.

[0053] The pump barrel assembly 30 includes an upper coupling 31 , a pump barrel 32 , a lower coupling 33 and a fixed valve 20 which are sequentially connected from top to bottom.

[0054] The plunger assembly 40 includes an oil outlet joint 41, an upstream movable valve 101, an upstream movable valve joint 42, a plunger 43, a downstream movable valve joint 44, a downstream movable valve 102 and an oil inlet joint 45, which are sequentially connected from top to bottom. The upstream movable valve 101 and the downstream movable valve 102 are movable valves 10 of the same structure.

[0055] When the forced-closed anti-stuck oil pump is in the upstroke, at the lower starting point, the plunger assembly 40 starts to move upward, and the suction liquid in the oil pipe on the pump flows in the opposite direction, and passes through the conical flow channel with a cone angle Y of the floating valve core 12. The instantaneous linear velocity of the fluid increases greatly, generating a jet, which sprays and impacts the floating valve ball 13, pushing the floating valve ball 13 to close in advance; at this time, the fixed valve ball 23 opens under the pressure of the submergence degree, and the oil enters the pump chamber.

[0056] When the forced-closing anti-stuck oil pump is in the downstroke, at the upper starting point, the plunger assembly 40 changes from upward to downward, the fixed valve 20 stops taking in liquid, and the push rod 24, under the action of the elastic force of the telescopic member 27, pushes the fixed valve ball 23 to close in advance; at this time, the pressure in the pump chamber increases, pushing open the downstream movable valve 102 and the movable valve ball 13 in the upstream movable valve 101 in turn, and the oil enters the oil pipe on the pump through the channel in the plunger assembly 40.

[0057] When the sand deposition and wax deposition in the fixed valve 20 are serious, resulting in the fixed valve ball 23 being unable to be completely closed, the plunger assembly 40 can be lowered to form a collision pump. The lower end surface of the oil inlet joint 45 at the lower part of the plunger assembly 40 presses the part of the push rod 24 protruding from the outer end surface of the D end of the embedded valve cover 26, mechanically pushing the fixed valve ball 23 to be completely closed. At the same time, the descaling ring 25 on the push rod 24 scrapes off the accumulated sand and wax in the embedded valve cover 26. When pumping is started again, the scraped-off accumulated sand and wax are discharged out of the pump along with the suction liquid, completing the sand cleaning and wax breaking functions.

[0058] The above-mentioned forced closing anti-stuck oil pump has forced closing and anti-stuck functions. It increases the instantaneous linear velocity of the fluid to make the liquid produce a jet effect, and relies on the reverse jet impact of the suction liquid to force the floating valve 10 to be forced closed, so there is no need to add a spring mechanism, so that the flow channel is spacious and unobstructed, the flow resistance loss is small, and the closing action is reliable and not easy to fail. The forced closing anti-stuck oil pump forces the fixed valve 20 to be forced closed by the elastic force of the push rod 24, rather than relying entirely on the free fall of the fixed valve ball 23. At the same time, the mechanical sand and wax breaking function is added, eliminating the hidden danger of the fixed valve ball 23 being stuck and unable to close, thereby reducing leakage.

[0059] The forced closing and anti-sticking oil pump provided by the present invention uses the floating valve 10 and the fixed valve 20 of the present invention, has forced closing and anti-sticking functions, can effectively improve the pumping efficiency of the oil pump in highly deviated wells and horizontal wells, extend the service life, and significantly reduce mining costs.

[0060] The above description is only a preferred embodiment of the present invention and is not a limitation of the technical solution of the present invention. It should be pointed out that those skilled in the art can make further improvements and changes based on the technical solution of the present invention, and these improvements and changes should be covered within the protection scope of the present invention.

Claims

1. A forced shut-off anti-stuck oil pump, characterized in that: include: A pump barrel assembly (30), the pump barrel assembly (30) comprising an upper coupling (31), a pump barrel (32), a lower coupling (33) and a fixed valve (20) connected in sequence from top to bottom; a plunger assembly (40), the plunger assembly (40) comprising an oil outlet joint (41), an upstream movable valve (101), an upstream movable valve joint (42), a plunger (43), a downstream movable valve joint (44), a downstream movable valve (102) and an oil inlet joint (45) connected in sequence from top to bottom, the upstream movable valve (101) and the downstream movable valve (102) being movable valves (10) of the same structure; the plunger assembly (40) is sleeved in the pump barrel assembly (30); The traveling valve (10) comprises: a traveling valve housing (11), a traveling valve core (12) and a traveling valve seat (14) arranged side by side in the traveling valve housing (11), the traveling valve core (12) comprising a section A and a section B, the section A being arranged adjacent to the traveling valve seat (14), the section B being arranged apart from the traveling valve seat (14), a gap being provided between the section A of the traveling valve core (12) and the traveling valve seat (14), and a traveling valve ball (13) being movably provided in the section A of the traveling valve core (12); the section B of the traveling valve core (12) being provided with a tapered flow passage which is larger outside and smaller inside from outside to inside, the tapered flow passage having a tapered angle of 8° to 15°; the closing of the traveling valve (10) relies on the reverse jet impact of the suction liquid; The fixed valve (20) comprises: a fixed valve joint (21), an embedded valve cover (26) and a fixed valve seat (22) arranged side by side in the fixed valve joint (21), the two ends of the embedded valve cover (26) being a C end and a D end respectively, the C end being arranged adjacent to the fixed valve seat (22), and the D end being arranged apart from the fixed valve seat (22), the C end of the embedded valve cover (26) being tightly against the fixed valve seat (22), the embedded valve cover (26) being provided with a flow hole penetrating through the end surface of the D end of the embedded valve cover (26), and a fixed valve ball being movably arranged in a flow cavity of the embedded valve cover (26). (23), and a push rod (24) slidingly penetrating the end surface of the D end of the embedded valve cover (26), the two ends of the push rod (24) are respectively an E end and an F end, the E end is arranged adjacent to the fixed valve seat (22), and the F end is arranged away from the fixed valve seat (22), the E end of the push rod (24) is provided with a descaling ring (25), and the fixed valve ball (23) is located between the descaling ring (25) and the C end of the embedded valve cover (26); a telescopic member (27) is sleeved on the push rod (24), and the telescopic member (27) is located between the inner end surface of the D end of the embedded valve cover (26) and the descaling ring (25); When the fixed valve (20) is closed, the end surface of the F end of the push rod (24) and the outer end surface of the D end of the embedded valve cover (26) are located in the same plane; When sand is deposited and wax is formed in the fixed valve, the plunger assembly is lowered to form a pump collision. The lower end surface of the lower part of the plunger assembly presses the part of the push rod protruding from the outer end surface of the D end of the embedded valve cover, and the fixed valve ball is mechanically pushed to close completely. At the same time, the descaling ring on the push rod scrapes off the accumulated sand and wax in the embedded valve cover. When pumping again, the sand and wax are discharged out of the pump along with the suction liquid, completing the sand cleaning and wax breaking functions.

2. The forced closing anti-stuck oil pump according to claim 1, characterized in that: The push rod (24) comprises a rod body (241) and supporting ribs (242); the descaling ring (25) is arranged on the rod body (241) via the supporting ribs (242); a sharp blade is arranged at the end of the descaling ring (25); and a projection area of ​​the descaling ring (25) is larger than a projection area of ​​the fixed valve ball (23).

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