Oil extraction device

Abstract

The utility model provides an oil extraction device which comprises an outer cylinder, a cavity for containing fluid is defined in the outer cylinder, and at least one liquid inlet hole allowing external fluid to enter the cavity is formed in the outer cylinder. Wherein an inner cylinder and a pressure mechanism which are sleeved together are arranged in the cavity, and the pressure mechanism is configured to be capable of performing reciprocating motion in the axial direction of the inner cylinder and driving fluid in the cavity to continuously move upwards in the reciprocating motion process. In this way, after the fluid reaches the cavity from the liquid inlet hole, the fluid can continuously move upwards along with the reciprocating motion of the pressure mechanism, and therefore the situation that the volume of oil contained in the cavity for storing oil is reduced due to the fact that the cavity for storing oil is filled with gas contained in the fluid can be avoided. Therefore, the technical problem of low oil and gas exploitation efficiency in the prior art can be solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of oil production equipment, in particular to an oil production device. Background Art

[0002] In the process of exploiting the Tahe Oilfield, the main method of exploitation is gas injection and three-way recovery. Although this method can effectively exploit the oil and liquid resources contained in the Tahe Oilfield, it will lead to an increase in the gas-liquid ratio in the oil well, which will easily cause gas lock on the oil production equipment under the action of gas, reducing the efficiency of oil and gas extraction.

[0003] Among them, the generation of gas lock mainly includes the downhole oil and gas mixture entering the pump chamber during the upstroke of the oil pump, and the free gas escapes from the oil and fills the pump chamber under the low-pressure environment of the pump chamber, causing the volume of the oil in the pump chamber to decrease.

[0004] During the down stroke, due to the compressibility of the gas, sufficient pressure cannot be formed in the pump chamber to open the oil outlet valve in time when the plunger begins to move downward. In severe cases, during one or several complete cycles of the oil pump, both the oil inlet valve and the oil outlet valve are in a closed state, and no liquid is discharged from the oil well. Utility Model Content

[0005] In order to overcome at least one or more of the above-mentioned defects in the prior art, the utility model provides an oil production device, comprising an outer cylinder defining a cavity for containing a fluid, wherein at least one liquid inlet hole allowing external fluid to enter the cavity is provided on the outer cylinder,

[0006] Wherein, an inner cylinder and a pressure mechanism which are sleeved together are arranged in the cavity, and the pressure mechanism is configured to be able to reciprocate along the axial direction of the inner cylinder and drive the fluid in the cavity to continuously move upward during the reciprocating motion.

[0007] In one embodiment, the inner cylinder and the pressure mechanism jointly define an upper chamber and a lower chamber for respectively accommodating fluids, and the pressure mechanism is configured to enable the fluid to move upward along the liquid inlet hole and the cavity into the lower chamber during the reciprocating motion, and drive the fluid in the upper chamber to move upward, and allow the fluid to move upward from the lower chamber and flow into the upper chamber.

[0008] In one embodiment, the inner cylinder includes a first pump cylinder, a second pump cylinder, and a first step for connecting the first pump cylinder with the second pump cylinder, the pressure mechanism includes a first plunger, a second plunger, and a second step for connecting the first plunger with the second plunger, the pressure mechanism is sealingly sleeved in the inner cylinder, and the first step and the second step jointly define an upper chamber for containing fluid, and the upper chamber is configured to communicate with the interior of the first plunger.

[0009] In one embodiment, a through hole is provided on the second step, and the through hole is used to connect the upper chamber with the interior of the first plunger.

[0010] In one embodiment, an inlet valve is provided at the free end of the first pump barrel, and a first outlet valve is provided at the free end of the first plunger. The inlet valve and the first outlet valve jointly define a lower chamber for containing fluid, and the inlet valve and the first outlet valve are constructed to open when subjected to a force.

[0011] In one embodiment, a first locking mechanism is further provided on the inner tube, and a second locking mechanism is further provided on the outer tube. The first locking mechanism and the second locking mechanism are configured to cooperate with each other and are used to be fixed relative to each other.

[0012] In one embodiment, the first locking mechanism includes a boss extending radially outward along the second pump cylinder, and at least one radially inwardly recessed groove is formed on the boss. The second locking mechanism includes a rib extending radially inward along the outer cylinder, and the rib is configured to cooperate with the groove.

[0013] In one embodiment, the first locking mechanism further includes a limiting rod disposed on the second pump cylinder and extending radially outward, and the second locking mechanism further includes a limiting platform extending radially inward along the inner wall of the outer cylinder, and the limiting platform is configured to abut against the limiting rod.

[0014] In one embodiment, a second liquid outlet valve is further provided at the end of the second plunger, and the second liquid outlet valve is configured to open when receiving a force from the second plunger.

[0015] In one embodiment, the second liquid outlet valve is configured to abut against the second pump barrel when the second plunger moves axially downward, so as to limit the axial downward movement of the second plunger.

[0016] In general, compared with the prior art, the above technical solution conceived by the utility model can achieve at least the following beneficial effects:

[0017] In the utility model, an outer cylinder is provided to define a cavity for containing fluid, and at least one liquid inlet hole is provided on the outer cylinder to allow external fluid to enter the cavity, so that the external fluid can enter the cavity along the liquid inlet hole. At the same time, an inner cylinder and a pressure mechanism are provided in the cavity, and the pressure mechanism is configured to be able to reciprocate along the axial direction of the inner cylinder, and can drive the fluid in the cavity to continuously move upward during the reciprocating motion. In this way, after the fluid reaches the cavity from the liquid inlet hole, it can continuously move upward with the reciprocating motion of the pressure mechanism, so that the gas contained in the fluid can be prevented from filling the chamber for storing oil, resulting in a reduction in the volume of oil contained in the chamber for storing oil. In this way, the technical problem of low oil and gas extraction efficiency in the prior art can be solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The overall structure of the upward movement of the pressure mechanism of the oil production device according to the utility model is schematically shown;

[0019] Figure 2 The overall structure of the downward movement of the pressure mechanism of the oil production device according to the utility model is schematically shown.

[0020] It should be noted that the drawings are not necessarily drawn according to actual scale.

[0021] In all the drawings, the same figure numbers represent the same technical features, specifically: 100-oil production device; 1-outer cylinder; 11-bottom wall; 12-side wall; 13-cavity; 14-liquid inlet hole; 15-second locking mechanism; 151-convex rib; 152-limiting platform; 2-inner cylinder; 21-first pump barrel; 211-liquid inlet valve; 22-second pump barrel; 23-first step surface; 24-first locking mechanism; 241-boss; 242-groove; 243-limiting rod; 3-pressure mechanism; 31-first plunger; 311-first liquid outlet valve; 32-second plunger; 321-second liquid outlet valve; 33-second step surface; 331-through hole; 4-upper chamber; 5-lower chamber. DETAILED DESCRIPTION

[0022] In order to better understand the purpose, structure and function of the utility model, the oil production device of the utility model is further described in detail below in conjunction with the accompanying drawings.

[0023] For convenience, the direction extending along the outer cylinder is referred to as "axial direction", "vertical direction" or similar terms, the direction perpendicular to the "axial direction" is referred to as "radial direction", "horizontal direction" or similar terms, the direction of movement from the lower chamber to the upper chamber is referred to as "upward" or similar terms, and the direction of movement from the upper chamber to the lower chamber is referred to as "downward" or similar terms.

[0024] like Figure 1 As shown, an embodiment of the utility model provides an oil production device 100, including an outer cylinder 1 for connecting with a fluid delivery pipe (not shown in the figure), the outer cylinder 1 including a bottom wall 11, on which a side wall 12 extending upward is arranged, and the side wall 12 is surrounded and together with the bottom wall 11 forms a cavity 13 for accommodating flow. Among them, a plurality of liquid inlet holes 14 penetrating the side wall 12 are arranged on the side wall 12, and the liquid inlet holes 14 are used to communicate with the cavity 13. In this way, the external fluid can enter the cavity 13 along the liquid inlet holes 14.

[0025] At the same time, if Figure 1 As shown, an inner cylinder 2 is also provided in the cavity 13, and the inner cylinder 2 is provided with a hollow structure and is relatively fixed with the outer cylinder 1 to form a path for fluid movement. In addition, a pressure mechanism 3 is also provided in the inner cylinder 2, and the pressure mechanism 3 is configured to be hollow and can reciprocate along the axial direction of the inner cylinder 2, and can exert a force on the fluid in the cavity 13 during the reciprocating motion, so that the fluid can continuously move upward to the fluid delivery pipe. In this way, it is possible to prevent the gas contained in the fluid from filling the chamber storing the oil, resulting in a reduction in the volume of the oil stored in the chamber storing the oil. In this way, the technical problem of low oil and gas extraction efficiency in the prior art can be solved.

[0026] In one embodiment, Figure 1 As shown, the inner cylinder 2 includes a first pump cylinder 21 and a second pump cylinder 22 interconnected with the first pump cylinder 21. In this embodiment, the radial width of the second pump cylinder 22 is smaller than that of the first pump cylinder 21, so that a first step surface 23 is formed between the first pump cylinder 21 and the second pump cylinder 22.

[0027] At the same time, if Figure 1 As shown, the pressure mechanism 3 includes a first plunger 31 and a second plunger 32 that is interconnected with the first plunger 31. In this embodiment, the first plunger 31 and the second plunger 32 are configured to cooperate with the first pump barrel 21 and the second pump barrel 22, respectively.

[0028] Specifically, Figure 1 As shown, the radial width of the second plunger 32 is smaller than that of the first plunger 31 , so that a second step surface 33 is formed between the first plunger 31 and the second plunger 32 , and the first plunger 31 and the second plunger 32 are respectively configured to fit together with the first pump barrel 21 and the second pump barrel 22 .

[0029] In this arrangement, the first plunger 31 and the second plunger 32 can move axially along the first pump barrel 21 and the second pump barrel 22, and the axial movement is limited by the first step surface 23 and the second step surface 33 cooperating with each other. Figure 1 As shown, in this way, the first step surface 23 and the second step surface 33 can jointly form an upper chamber 4 for accommodating a fluid.

[0030] In one embodiment, Figure 1 As shown, a through hole 331 is also provided on the second step surface 33, and the through hole 331 penetrates the second step surface 33, and is used to connect the upper chamber 4 with the interior of the first plunger 31. In this way, the fluid moving along the inner tube 2 into the first plunger 31 can enter the upper chamber 4 along the through hole 331 during the continuous upward movement.

[0031] In one embodiment, Figure 1 As shown, a liquid inlet valve 211 is also provided at the free end of the first pump barrel 21, and a first liquid outlet valve 311 is also provided at the free end of the first plunger 31. In this way, the first pump barrel 21, the first plunger 31, and the liquid inlet valve 211 and the first liquid outlet valve 311 jointly define a lower chamber 5 for containing fluid.

[0032] In this way, Figure 1 As shown, when the first plunger 31 moves upward, the volume of the upper chamber 4 will continue to decrease, thereby increasing the pressure in the upper chamber 4. At this time, the strong pressure in the upper chamber 4 will force the first liquid outlet valve 311 to be closed.

[0033] Furthermore, as the volume of the upper chamber 4 continues to decrease, the fluid in the upper chamber 4 will move from the through hole 331 into the first plunger 31, and move upward along the first plunger 31 and the second plunger 32 in the first plunger 31 until it moves from the free end of the second plunger 32 into the outer tube 1.

[0034] At the same time, during the upward movement of the first plunger 31, the volume of the lower chamber 5 will continue to increase, thereby reducing the pressure in the lower chamber 5. At this time, the strong pressure in the lower chamber 5 will force the liquid inlet valve 211 to be in an open state. As a result, the pressure in the cavity 13 can be reduced along with the pressure in the lower chamber 5. At this time, the fluid in the outside will enter the cavity 13 from the liquid inlet hole 14, and continue to move upward in the cavity 13 until it passes through the liquid inlet valve 211 and reaches the lower chamber 5.

[0035] However, if Figure 2As shown, when the first plunger 31 moves downward, the volume of the lower chamber 5 will continue to decrease. At this time, the strong pressure in the lower chamber 5 will force the liquid inlet valve 211 to be closed. As the first plunger 31 continues to move downward, the pressure in the lower chamber 5 will continue to increase. In this process, the strong pressure in the lower chamber 5 will force the first liquid outlet valve 311 to be open.

[0036] At this time, the fluid in the lower chamber 5 will flow through the first liquid outlet valve 311 and reach the first plunger 31, and continue to move upward in the first plunger 31. As the fluid continues to move upward, the fluid will enter the upper chamber 4 along the through hole 331, and after the fluid completely fills the upper chamber 4, it will continue to move upward along the second plunger 32 until it moves from the free end of the second plunger 32 to the outer tube 1. In this way, the fluid can continue to move upward, thereby preventing the gas contained in the fluid from filling the chamber storing the oil, resulting in a reduction in the volume of the oil stored in the chamber. In this way, the technical problem of low oil and gas extraction efficiency in the prior art can be solved.

[0037] In one embodiment, Figure 1 As shown, a first locking mechanism 24 is also provided on the inner cylinder 2, and a second locking mechanism 15 is also provided on the inner wall of the outer cylinder 1. The first locking mechanism 24 and the second locking mechanism 15 are configured to cooperate with each other and are used to be fixed relative to each other. In this embodiment, the first locking mechanism 24 includes a boss 241 extending radially outward along the second pump cylinder 22, and at least one radially inwardly recessed groove 242 is formed on the boss 241.

[0038] At the same time, if Figure 1 As shown, the second locking mechanism 15 includes a convex rib 151 extending radially inwardly along the inner wall of the outer cylinder 1 and used to cooperate with the groove 242. In this way, the convex rib 152 and the groove 242 can cooperate with each other, so that the outer cylinder 1 and the inner cylinder 2 can be fixed relative to each other.

[0039] According to a preferred embodiment of the present invention, Figure 1 As shown, two grooves 242 are provided on the boss 241. Moreover, the ribs 152 located on the inner wall of the outer cylinder 1 are provided in a corresponding manner to the grooves 242. In this way, the outer cylinder 1 and the inner cylinder 2 can be further relatively fixed together.

[0040] According to a preferred embodiment of the present invention, Figure 1As shown, the first locking mechanism 24 further includes a limiting rod 243 disposed on the second pump cylinder 22 and extending radially outward. At the same time, the second locking mechanism 15 further includes a limiting platform 152 extending radially inward along the inner wall of the outer cylinder 1, and the limiting platform 152 is configured to abut against the limiting rod 243. In this way, the movement of the inner cylinder 2 can be limited, so that the inner cylinder 2 is further stably disposed in the outer cylinder 1.

[0041] In one embodiment, Figure 1 As shown, a second liquid outlet valve 321 is also provided at the end of the second plunger 32, and the second liquid outlet valve 321 is configured to connect the second plunger 32 with the outer cylinder 1 when subjected to a ground force applied by the fluid in the second plunger 32. In this way, the second liquid outlet valve 321 can form a one-way conduction, thereby preventing the fluid above the second liquid outlet valve 321 from moving downward.

[0042] According to a preferred embodiment of the present invention, Figure 1 As shown, the second liquid outlet valve 321 is arranged to have a radial distance greater than the second plunger 32. In this way, when the second liquid outlet valve 321 moves axially downward, it can abut against the second pump barrel 22. Thus, the downward movement of the second plunger 32 can be limited, thereby preventing the second plunger 32 from being immersed in the inner barrel 2.

[0043] The operation of the oil production device 100 according to the present invention is as follows.

[0044] First, if Figure 1 As shown, a first liquid outlet valve 311 is provided on the first plunger 31 , and the first plunger 31 and the second plunger 32 are sleeved in the inner tube 2 , so that the first plunger 31 and the second plunger 32 can move axially along the inner tube 2 .

[0045] At the same time, the inner cylinder 2 is provided with a liquid inlet valve 211 and a first locking mechanism 24, and the inner cylinder 2 is sleeved in the outer cylinder 1, and the first locking mechanism 24 on the inner cylinder 2 cooperates with the second locking mechanism 15 on the outer cylinder 1, so that the inner cylinder 2 and the outer cylinder 1 are fixed relative to each other. Then, the second liquid outlet valve 321 is provided on the first plunger 31. Thus, the assembly of the device 100 is completed.

[0046] At this time, if Figure 1 As shown, when the first plunger 31 moves upward, the volume of the upper chamber 4 formed between the inner tube 2 and the pressure mechanism 3 will continue to decrease, thereby increasing the pressure in the upper chamber 4. At this time, the strong pressure in the upper chamber 4 will force the first liquid outlet valve 311 to be closed.

[0047] Furthermore, as the volume of the upper chamber 4 continues to decrease, the fluid in the upper chamber 4 moves from the through hole 331 into the first plunger 31, and moves upward along the first plunger 31 and the second plunger 32 in the first plunger 31. At this time, the second liquid outlet valve 321 at the free end of the first plunger 31 will be opened under the force of the fluid, so that the fluid can move into the outer tube 1 through the second liquid outlet valve 321.

[0048] At the same time, if Figure 1 As shown, during the upward movement of the first plunger 31, the volume of the lower chamber 5 formed between the inner cylinder 2 and the pressure mechanism 3 will continue to increase, thereby reducing the pressure in the lower chamber 5. At this time, the strong pressure in the lower chamber 5 will force the liquid inlet valve 211 to be in an open state. As a result, the lower chamber 5 can be connected to the cavity 13 formed by the inner cylinder 2 and the outer cylinder 1, and the pressure in the cavity 13 can be reduced along with the pressure in the lower chamber 5. At this time, the fluid in the outside will enter the cavity 13 from the liquid inlet hole 14, and continue to move upward in the cavity 13 until it passes through the liquid inlet valve 211 and reaches the lower chamber 5.

[0049] However, if Figure 2 As shown, when the first plunger 31 moves downward, the volume of the lower chamber 5 will continue to decrease. At this time, the strong pressure in the lower chamber 5 will force the liquid inlet valve 211 to be closed. As the first plunger 31 continues to move downward, the pressure in the lower chamber 5 will continue to increase. In this process, the strong pressure in the lower chamber 5 will force the first liquid outlet valve 311 to be open.

[0050] At this time, the fluid in the lower chamber 5 will flow through the first liquid outlet valve 311, reach the first plunger 31, and continue to move upward in the first plunger 31. As the fluid continues to move upward, the fluid will enter the upper chamber 4 along the through hole 331, and after the fluid completely fills the upper chamber 4, it will continue to move upward along the second plunger 32 until the second liquid outlet valve 321 on the second plunger 32 is opened, and moves into the outer tube 1 through the second liquid outlet valve 321. In this way, the fluid can continue to move upward, thereby preventing the gas contained in the fluid from filling the chamber storing the oil, resulting in a reduction in the volume of the oil stored in the chamber storing the oil. In this way, the technical problem of low oil and gas extraction efficiency in the prior art can be solved.

[0051] It is understood that the present invention is described by some embodiments, and those skilled in the art are aware that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. An oil production device, characterized in that: The invention comprises an outer cylinder (1) defining a cavity (13) for containing a fluid, wherein the outer cylinder (1) is provided with at least one liquid inlet hole (14) for allowing external fluid to enter the cavity (13), An inner cylinder (2) and a pressure mechanism (3) which are sleeved together are arranged in the cavity (13); the pressure mechanism (3) is configured to be able to reciprocate along the axial direction of the inner cylinder (2) and to drive the fluid in the cavity (13) to continuously move upwards during the reciprocating motion.

2. The oil production device according to claim 1, characterized in that: The inner cylinder (2) and the pressure mechanism (3) define an upper chamber (4) and a lower chamber (5) for containing fluids, respectively. The pressure mechanism (3) is configured to enable the fluid to move upward along the liquid inlet hole (14) and the cavity (13) into the lower chamber (5) during reciprocating motion, and to drive the fluid in the upper chamber (4) to move upward, and to allow the fluid to move upward from the lower chamber (5) and flow into the upper chamber (4).

3. The oil production device according to claim 2, characterized in that: The inner cylinder (2) comprises a first pump cylinder (21), a second pump cylinder (22) and a first step (23) for connecting the first pump cylinder (21) and the second pump cylinder (22) to each other; the pressure mechanism (3) comprises a first plunger (31), a second plunger (32) and a second step (33) for connecting the first plunger (31) and the second plunger (32) to each other; the pressure mechanism (3) is sealedly sleeved in the inner cylinder (2) so that the first step (23) and the second step (33) together define an upper chamber (4) for containing a fluid; the upper chamber (4) is arranged to communicate with the interior of the first plunger (31).

4. The oil production device according to claim 3, characterized in that: A through hole (331) is provided on the second step (33), and the through hole (331) is used to connect the upper chamber (4) with the interior of the first plunger (31).

5. The oil production device according to claim 4, characterized in that: A liquid inlet valve (211) is provided at the free end of the first pump barrel (21), and a first liquid outlet valve (311) is provided at the free end of the first plunger (31). The liquid inlet valve (211) and the first liquid outlet valve (311) together define a lower chamber (5) containing a fluid, and the liquid inlet valve (211) and the first liquid outlet valve (311) are configured to open when subjected to an applied force.

6. The oil production device according to any one of claims 1 to 5, characterized in that: A first locking mechanism (24) is also provided on the inner cylinder (2), and a second locking mechanism (15) is also provided on the outer cylinder (1); the first locking mechanism (24) and the second locking mechanism (15) are configured to cooperate with each other and are used to be fixed relative to each other.

7. The oil production device according to claim 6, characterized in that: The first locking mechanism (24) comprises a boss (241) extending radially outward along the second pump cylinder (22), and at least one radially inwardly recessed groove (242) is formed on the boss (241). The second locking mechanism (15) comprises a convex rib (151) extending radially inward along the outer cylinder (1), and the convex rib (151) is configured to cooperate with the groove (242).

8. The oil production device according to claim 7, characterized in that: The first locking mechanism (24) further comprises a limiting rod (243) which is arranged on the second pump cylinder (22) and extends radially outwards. The second locking mechanism (15) further comprises a limiting platform (152) which extends radially inwards along the inner wall of the outer cylinder (1). The limiting platform (152) is configured to be capable of abutting against the limiting rod (243).

9. The oil production device according to claim 8, characterized in that: A second liquid outlet valve (321) is also provided at the end of the second plunger (32), and the second liquid outlet valve (321) is configured to open when subjected to a force from the second plunger (32).

10. The oil production device according to claim 9, characterized in that: The second liquid outlet valve (321) is configured to abut against the second pump barrel (22) when the second plunger (32) moves axially downward, so as to limit the axial downward movement of the second plunger (32).

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