Layered oil well pump

Abstract

The utility model provides a layering oil well pump which comprises a first oil pumping unit, and the first oil pumping unit comprises a first pump cylinder and a second pump cylinder which are spaced, a first oil pumping mechanism arranged between the first pump cylinder and the second pump cylinder and used for being connected with an upper oil layer, and a first plunger concentrically arranged in the first pump cylinder. The second oil pumping unit comprises a third pump cylinder arranged on the downstream of the second pump cylinder, a second plunger concentrically arranged in the third pump cylinder and connected with the sucker rod, and a third pump cylinder arranged on the downstream of the second pump cylinder and connected with the second plunger. And the second oil pumping mechanism is arranged in the third pump cylinder and is used for being connected with a lower oil layer.

Description

Technical Field

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

[0002] At present, carbonate fracture-cave oil reservoirs are mainly composed of caves and large fractures. The caves are large in scale and have various forms of connection. The flow characteristics of the formation fluid are complex, making the exploitation of the oil reservoirs difficult.

[0003] The oil pump is a commonly used downhole device for pumping crude oil from an oil well to the ground. However, conventional oil pumps still have the following problems in the exploitation of carbonate fracture-cave oil reservoirs: First, due to the large scale and diverse forms of connectivity of caves, conventional oil pumps are usually only able to pump oil from formation fluids at the same height. Therefore, conventional oil pumps have lower working efficiency during the exploitation process, which affects the displacement of the oil pumps. Second, due to the heavy load during the exploitation process, conventional oil pumps are prone to high failure rates, which results in low working efficiency and can easily seriously affect the exploitation effect.

[0004] Therefore, it is desired in the art to provide a stratified oil pump to solve the above technical problems. Utility Model Content

[0005] The utility model aims to provide a stratified oil pump, which can prompt an upper pump assembly and a lower pump assembly to simultaneously complete the work of pumping and discharging oil in a reciprocating stroke, thereby achieving the purpose of one rod having multiple uses.

[0006] According to the utility model, a stratified oil pump is provided, comprising a first oil pumping unit, the first oil pumping unit comprising a first pump barrel and a second pump barrel separated from each other, a first oil pumping mechanism arranged between the first pump barrel and the second pump barrel and used to connect to an upper oil layer, and a first plunger concentrically arranged in the first pump barrel.

[0007] a sucker rod disposed in the second pump barrel and connected to the first plunger, and

[0008] The second pumping unit includes a third pump barrel arranged downstream of the second pump barrel, a second plunger arranged concentrically in the third pump barrel and connected to the sucker rod, and a second pumping mechanism arranged in the third pump barrel and used to connect to the lower oil layer.

[0009] In one embodiment, the first pumping mechanism includes a first oil pipe coupling connected to the first pump barrel, an oil inlet valve seat respectively forming a sealing connection with the second pump barrel and the first oil pipe coupling, and an oil discharge valve seat arranged between the first plunger and the sucker rod.

[0010] In one embodiment, a plurality of oil inlet assemblies are arranged at intervals along the circumference of the oil inlet valve seat, and a plurality of oil discharge assemblies are arranged at intervals along the circumference of the oil discharge valve seat.

[0011] In one embodiment, the oil inlet assembly and the oil discharge assembly both include an oil chamber and a valve cover sealed and fixed to the upper end surface of the oil chamber, wherein a channel for allowing oil to enter is formed at the bottom of the oil chamber, and a buffer block is provided at the upper end surface of the channel.

[0012] The oil inlet assembly and the oil discharge assembly both include a valve ball disposed in the oil cavity and used for abutting against the buffer block to block the channel.

[0013] In one embodiment, the valve cover is configured as a one-way valve cover, and the valve ball is configured as a one-way valve ball.

[0014] In one embodiment, the second oil pumping mechanism further comprises a traveling assembly disposed at the bottom of the second plunger, and the traveling assembly comprises a traveling valve cover and a traveling valve sequentially arranged along the axial direction.

[0015] In one embodiment, the second pumping mechanism further includes a valve seat joint, and a second oil pipe coupling disposed between the valve seat joint and the third pump barrel, wherein a fixed valve allowing oil to enter is disposed in the valve seat joint.

[0016] In one embodiment, the stratified oil pump further includes a third oil pipe coupling disposed between the second pump barrel and the third pump barrel, and an oil discharge cap for connecting the sucker rod and the second plunger is disposed in the third oil pipe coupling.

[0017] In one embodiment, plunger joints are provided at the top ends of the first plunger and the second plunger.

[0018] In one embodiment, the stratified oil pump further includes a fourth oil pipe coupling threadedly connected to the top end of the first pump barrel.

[0019] Compared with the prior art, the advantages of the utility model are:

[0020] First, the utility model can make the upper pump assembly and the lower pump assembly complete the work of pumping and draining oil at the same time in one reciprocating stroke, thereby achieving the purpose of one rod for multiple purposes. In addition, the downward resistance of the sucker rod is small during the downstroke, thereby effectively improving the pumping efficiency of the stratified oil pump and the efficiency of the mechanical oil production system.

[0021] Secondly, compared with conventional pumps, this device has the advantages of large displacement, simple and compact structure, reliable performance, low failure rate, and long pump inspection cycle, so it has good promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be described in detail below in conjunction with the accompanying drawings, in which:

[0023] Figure 1 The structure of the stratified oil pump according to the utility model is schematically shown;

[0024] Figure 2 for Figure 1 A partial view of the structure of the oil inlet valve seat and the oil inlet assembly is shown;

[0025] Figure 3 for Figure 1 A partial view of the oil drain valve seat and the oil drain assembly is shown.

[0026] In the drawings, the same reference numerals are used for the same components. The drawings are not drawn to scale. DETAILED DESCRIPTION

[0027] In order to make the technical solutions and advantages of the present invention more clearly understood, the exemplary embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than an exhaustive list of all embodiments. In addition, the embodiments of the present invention and the features in the embodiments can be combined with each other if there is no conflict.

[0028] The utility model will be further described below in conjunction with the accompanying drawings.

[0029] Figure 1 The structure of the stratified oil pump 100 according to the utility model is schematically shown;

[0030] Figure 2 for Figure 1 A partial view showing the structure of the oil inlet valve seat 22 and the oil inlet assembly;

[0031] Figure 3 for Figure 1 A partial view showing the structure of the oil drain valve seat 23 and the oil drain assembly.

[0032] like Figure 1 As shown, the stratified oil pump 100 according to the utility model mainly includes a first oil pumping unit. The first oil pumping unit includes a first pump barrel 11 and a second pump barrel 12 separated from each other, a first oil pumping mechanism disposed between the first pump barrel 11 and the second pump barrel 12, and a first plunger 13 concentrically arranged in the first pump barrel 11. Preferably, the first oil pumping mechanism is connected to the upper oil layer, so that the upper oil layer can be pumped and discharged.

[0033] According to the utility model, if Figure 1As shown, the stratified oil pump 100 further includes a second oil pumping unit. Preferably, the second oil pumping unit includes a third pump barrel 41 disposed downstream of the second pump barrel 12, a second plunger 42 concentrically arranged in the third pump barrel 41, and a second oil pumping mechanism disposed in the third pump barrel 41. Preferably, the second oil pumping mechanism is connected to the lower oil layer, so that the lower oil layer can be pumped and discharged.

[0034] In one embodiment of the utility model, the stratified oil pump 100 further includes a sucker rod 31 disposed in the second pump barrel 12. Preferably, the upper end surface of the sucker rod 31 is fixedly connected to the first plunger 13, and the lower end surface of the sucker rod 31 is fixedly connected to the second plunger 42. Thus, the sucker rod 31, the first plunger 13 and the second plunger 42 can move synchronously, so that stratified mining can be carried out more easily, thereby achieving the purpose of one pump for multiple uses, and further improving the working efficiency of the stratified oil pump 100.

[0035] In the present utility model, if Figure 1 As shown, a main oil drain valve 14 and a main oil drain valve cover 15 adapted to the main oil drain valve 14 are provided above the first plunger 13. Preferably, the oil in the upper oil layer sucked by the first pumping mechanism and the oil in the lower oil layer sucked by the second pumping mechanism can both be discharged to the ground through the main oil drain valve 14.

[0036] In one embodiment, Figure 1 As shown, the first pumping mechanism includes a first oil pipe coupling 21 connected to the first pump barrel 11, an oil inlet valve seat 22 which forms a sealed connection with the second pump barrel 12 and the first oil pipe coupling 21 respectively, and an oil discharge valve seat 23 arranged between the first plunger 13 and the sucker rod 31.

[0037] In the utility model, the oil inlet valve seat 22 is connected to the upper oil layer. Therefore, the oil in the upper oil layer can first enter the first oil pipe coupling 21 through the oil inlet valve seat 22 (i.e., oil pumping work), and then be discharged from the oil drain valve seat 23 and go up to the main oil drain valve 14 (i.e., oil draining work).

[0038] Preferably, an external thread is provided at the bottom end of the first plunger 13, whereby the oil inlet valve seat 22 can be fixed to the bottom of the first plunger 13 by threaded connection. An internal thread is provided inside the oil inlet valve seat 22, whereby the sucker rod 31 can be partially fixed in the oil inlet valve seat 22 by threaded connection.

[0039] Preferably, the drain valve seat 23 is configured in the form of a hollow sleeve, so that a flow channel is formed inside the drain valve seat 23 to allow the sucker rod 31 and the oil in the lower oil layer to pass through. In the present utility model, an external thread is provided at the bottom of the drain valve seat 23, so that the drain valve seat 23 can be fixed to the upper end surface of the second pump barrel 12 by threaded connection.

[0040] In the present invention, the first pump barrel 11 and the first oil pipe coupling 21 are threadedly connected.

[0041] In one embodiment, Figure 2 As shown, a plurality of oil inlet assemblies are arranged at intervals along the circumference of the oil inlet valve seat 22. Preferably, the oil inlet assembly includes a housing 111, an oil chamber 112 formed in the housing 111, and a valve cover 113 sealed and fixed to the upper end surface of the oil chamber 112.

[0042] Preferably, an external thread is provided on the outer wall of the housing 111 , so that the housing 111 can be fixedly connected to the first oil pipe coupling 21 via the external thread.

[0043] In one embodiment, Figure 2 As shown, a channel 114 for allowing oil to enter is formed at the bottom of the oil chamber 112. Preferably, a buffer block 115 is provided at the upper end surface of the channel 114, and the oil inlet assembly further includes a valve ball 116 disposed in the oil chamber 112 and used to abut against the buffer block 115.

[0044] In the present invention, when the first plunger 13 performs a downward stroke, the valve ball 116 will be seated on the channel 114 to achieve the function of blocking the channel 114, thereby ensuring that the oil pumping work proceeds smoothly. Preferably, the valve ball 116 and the buffer block 115 are both made of hard alloy material.

[0045] In one embodiment, Figure 3 As shown, a plurality of oil drain assemblies are arranged at intervals along the circumference of the oil drain valve seat 23. Preferably, the oil drain assembly includes a housing 121, an oil chamber 122 formed in the housing 121, and a valve cover 123 sealed and fixed to the upper end surface of the oil chamber 122.

[0046] In one embodiment, Figure 3 As shown, a channel 124 for allowing oil to enter is formed at the bottom of the oil chamber 122. Preferably, a buffer block 125 is provided at the upper end surface of the channel 124, and the oil discharge assembly further includes a valve ball 126 disposed in the oil chamber 122 and used to abut against the buffer block 125.

[0047] In the present invention, when the first plunger 13 performs an upward stroke, the valve ball 126 will be seated on the channel 124 to achieve the function of blocking the channel 124, thereby ensuring smooth oil discharge. Preferably, the valve ball 126 and the buffer block 125 are both made of hard alloy material.

[0048] In one embodiment of the utility model, the valve cover 113 / 123 is a one-way valve cover, and the valve ball 116 / 126 is a one-way valve ball. In this way, the oil pumping and oil discharge work can be smoothly carried out, so as to further improve the working efficiency of the stratified oil pump 100.

[0049] In one embodiment, Figure 1 As shown, the second pumping mechanism further includes a traveling assembly arranged at the bottom of the second plunger 42. Preferably, the traveling assembly includes a traveling valve cover 51 and a traveling valve 52 arranged in sequence along the axial direction. In the utility model, the second pumping mechanism further includes a valve seat joint 53, and a second oil pipe coupling 54 arranged between the valve seat joint 53 and the third pump barrel 41. Preferably, a fixed valve 55 is provided in the valve seat joint 53 to allow oil to enter.

[0050] Preferably, when the second plunger 42 moves upward, the volume of the working chamber in the third pump barrel 41 and the second oil pipe coupling 54 increases and the pressure in the chamber decreases. When the pressure in the chamber is lower than the formation pressure of the lower oil layer, the fixed valve 55 opens and the floating valve 52 closes to complete the oil pumping work.

[0051] Preferably, when the second plunger 42 moves downward, the volume of the working chamber in the third pump barrel 41 and the second oil pipe coupling 54 is small and the pressure in the chamber increases. When the pressure in the chamber is higher than the formation pressure of the lower oil layer, the floating valve 52 opens and the fixed valve 55 closes to complete the oil discharge.

[0052] In one embodiment of the present invention, Figure 1 As shown, plunger joints, namely plunger joint 117 and plunger joint 127, are provided at the top ends of the first plunger 13 and the second plunger 42. Preferably, plunger joint 117 is threadedly connected to the first plunger 13, and plunger joint 127 is threadedly connected to the second plunger 42. In the present utility model, plunger joint 117 is threadedly connected to the main oil drain valve cover 15.

[0053] In one embodiment, Figure 1 As shown, the stratified oil pump 100 further includes a third oil pipe coupling 61 disposed between the second pump barrel 12 and the third pump barrel 41. Preferably, an oil discharge cover 62 for connecting the sucker rod 31 and the second plunger 42 is disposed in the third oil pipe coupling 61. Preferably, the third oil pipe coupling 61 is threadedly connected to the second pump barrel 12 and the third pump barrel 41, respectively.

[0054] In one embodiment, Figure 1 As shown, the stratified oil pump 100 further includes a fourth oil pipe coupling 63 threadedly connected to the top end of the first pump barrel 11 .

[0055] In the present invention, the first pumping mechanism, the plunger joint 117 and the first pump barrel 11 form an upper pump assembly, and the second pumping mechanism, the plunger joint 127 and the second pump barrel 12 form a lower pump assembly. Preferably, the upper pump assembly and the lower pump assembly are connected by a packer (not shown) and used in conjunction.

[0056] The working principle of the utility model is specifically introduced below:

[0057] When the stratified oil pump 100 performs an upstroke operation, the working process of the lower pump assembly is as follows:

[0058] The second plunger 42 and the plunger joint 127 move upward, the volume of the working chamber in the third pump barrel 41 and the second oil pipe coupling 54 increases, and the pressure in the chamber decreases. When the pressure in the chamber is lower than the formation pressure of the lower oil layer, the fixed valve 55 opens, thereby completing the oil pumping work of the lower oil layer.

[0059] Preferably, during the oil pumping process, the floating valve 52 is locked under the pressure of the liquid column in the oil pipe.

[0060] When the stratified oil pump 100 performs an upstroke operation, the working process of the upper pump assembly is as follows:

[0061] The first plunger 13 and the plunger joint 117 move upward, the volume of the working chamber formed by the sucker rod 31, the first oil pipe coupling 21 and the oil discharge valve seat 23 increases, and the pressure in the chamber decreases. When the pressure in the chamber is lower than the formation pressure of the upper oil layer, the oil inlet assembly opens, thereby completing the oil pumping work of the upper oil layer.

[0062] Preferably, during the oil pumping process, the oil discharge assembly is locked under the pressure of the liquid column in the oil pipe.

[0063] When the stratified oil pump 100 performs a downstroke operation, the working process of the lower pump assembly is as follows:

[0064] The second plunger 42 and the plunger joint 127 move downward, the volume of the working chamber in the third pump barrel 41 and the second oil pipe coupling 54 decreases, and the pressure in the chamber increases. When the pressure in the chamber is higher than the pressure of the liquid column in the oil pipe, the floating valve 52 opens, thereby completing the oil drainage work of the lower oil layer.

[0065] Preferably, during the oil discharge process, the fixed valve 55 is locked under the pressure of the liquid column in the oil pipe.

[0066] When the stratified oil pump 100 performs a downstroke operation, the working process of the upper pump assembly is as follows:

[0067] The first plunger 13 and the plunger joint 117 move downward, the volume of the working chamber formed by the sucker rod 31, the first oil pipe coupling 21 and the oil drain valve seat 23 decreases, and the pressure in the chamber increases. When the pressure in the chamber is higher than the pressure of the liquid column in the oil pipe, the oil drain assembly opens, thereby completing the oil drain work of the upper oil layer.

[0068] Preferably, during the oil discharge process, the oil inlet assembly is locked under the pressure of the liquid column in the oil pipe.

[0069] During the downstroke of the stratified oil pump 100 , the oil drawn by the lower pump will merge with the oil drawn by the upper pump and will be discharged to the ground through the main oil discharge valve 14 and the main oil discharge valve cover 15 .

[0070] In the present invention, when the stratified oil pump 100 performs an upward stroke or an upward stroke, the first plunger 13, the second plunger 42 and the sucker rod 31 all move synchronously. Thus, the stratified oil pump 100 can more easily achieve the purpose of one rod for multiple purposes, that is, in one reciprocating stroke, the upper pump and the lower pump perform the work of sucking and discharging oil at the same time.

[0071] Compared with the prior art, the advantages of the present invention are:

[0072] First, the utility model can make the upper pump assembly and the lower pump assembly complete the work of pumping and draining oil at the same time in one reciprocating stroke, thereby achieving the purpose of one rod for multiple purposes. In addition, the downward resistance of the sucker rod 31 is small during the downstroke, thereby effectively improving the pumping efficiency of the stratified oil pump 100 and the efficiency of the mechanical oil production system.

[0073] Secondly, compared with conventional pumps, this device has the advantages of large displacement, simple and compact structure, reliable performance, low failure rate, and long pump inspection cycle, so it has good promotion value.

[0074] In the description of the present utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0075] In the present utility model, unless otherwise clearly stipulated and limited, the terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal connection of two elements.

[0076] For those skilled in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0077] The above are only preferred embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art can easily make changes or modifications within the scope of the present invention, and such changes or modifications should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A stratified oil pump, characterized in that: include: A first pumping unit, the first pumping unit comprising a first pump barrel (11) and a second pump barrel (12) which are spaced apart from each other, a first pumping mechanism which is arranged between the first pump barrel (11) and the second pump barrel (12) and is used to connect to an upper oil layer, and a first plunger (13) which is concentrically arranged in the first pump barrel (11). a sucker rod (31) disposed in the second pump barrel (12) and connected to the first plunger (13), and A second pumping unit, the second pumping unit includes a third pump barrel (41) arranged downstream of the second pump barrel (12), a second plunger (42) arranged concentrically in the third pump barrel (41) and connected to the sucker rod (31), and a second pumping mechanism arranged in the third pump barrel (41) and used to connect to the lower oil layer.

2. The stratified oil pump according to claim 1, characterized in that: The first pumping mechanism comprises a first oil pipe coupling (21) connected to the first pump barrel (11), an oil inlet valve seat (22) respectively forming a sealed connection with the second pump barrel (12) and the first oil pipe coupling (21), and an oil discharge valve seat (23) arranged between the first plunger (13) and the pumping rod (31).

3. The stratified oil pump according to claim 2, characterized in that: A plurality of oil inlet assemblies arranged at intervals are provided along the circumference of the oil inlet valve seat (22), and a plurality of oil discharge assemblies arranged at intervals are provided along the circumference of the oil discharge valve seat (23).

4. The stratified oil pump according to claim 3, characterized in that: The oil inlet assembly and the oil discharge assembly both include an oil chamber and a valve cover sealed and fixed to the upper end surface of the oil chamber, wherein a channel for allowing oil to enter is formed at the bottom of the oil chamber, and a buffer block is provided at the upper end surface of the channel. The oil inlet assembly and the oil discharge assembly both include a valve ball disposed in the oil cavity and used for abutting against the buffer block to block the channel.

5. The stratified oil pump according to claim 4, characterized in that: The valve cover is configured as a one-way valve cover, and the valve ball is configured as a one-way valve ball.

6. The stratified oil pump according to claim 5, characterized in that: The second oil pumping mechanism further comprises a traveling assembly arranged at the bottom of the second plunger (42), wherein the traveling assembly comprises a traveling valve cover (51) and a traveling valve (52) which are sequentially arranged along the axial direction.

7. The stratified oil pump according to claim 6, characterized in that: The second pumping mechanism further comprises a valve seat joint (53) and a second oil pipe coupling (54) arranged between the valve seat joint (53) and the third pump barrel (41), wherein a fixed valve (55) allowing oil to enter is arranged in the valve seat joint (53).

8. The stratified oil pump according to any one of claims 1 to 7, characterized in that: The stratified oil pump also includes a third oil pipe coupling (61) arranged between the second pump barrel (12) and the third pump barrel (41), and an oil discharge cover (62) for connecting the sucker rod (31) and the second plunger (42) is arranged in the third oil pipe coupling (61).

9. The stratified oil pump according to any one of claims 1 to 7, characterized in that: Plunger joints are provided at the top ends of the first plunger (13) and the second plunger (42).

10. The stratified oil pump according to any one of claims 1 to 7, characterized in that: The stratified oil pump further comprises a fourth oil pipe coupling (63) threadedly connected to the top end of the first pump barrel (11).

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