Oil well pump

Abstract

The utility model relates to equipment for extracting oil from a well, in particular to an oil well pump. The oil well pump comprises the hollow rod column arranged in the oil well pipe column, the bottom of the hollow rod column is connected with the oil well pump plunger, the oil tamping column with the overflowing hole is connected to the bottom of the oil well pump plunger, the viscosity reducer is injected into a well in the up-down stroke process, and thick oil and the viscosity reducer are mixed in the up-down reciprocating process; the mixing degree of the thick oil and the viscosity reducer is enhanced, and the swabbing efficiency is improved to a certain extent.

Description

Technical Field

[0001] The utility model relates to a device for extracting oil from a well, in particular to an oil well pump. Background Art

[0002] During heavy oil production in some ultra-heavy and high-viscosity oil fields, as formation and wellbore temperatures drop, the viscosity of the crude oil at the corresponding locations increases rapidly. This can lead to difficulties in pumping crude oil, heavy lifting loads during pumping, and severe rod lag. Frequent rod breakage during short construction periods can affect the normal production of heavy oil and delay the expected project schedule. Wellbore chemical viscosity reduction is one method for improving the fluidity of crude oil within the wellbore. The principle is to add a certain amount of water-soluble surfactant to the wellbore, dispersing the crude oil as tiny droplets in the active water, forming an oil-in-water emulsion, which effectively reduces viscosity and wets the wellbore to reduce drag.

[0003] For example, the utility model patent application with authorization publication number CN203626761U discloses a novel hollow production tubing string device for chemically adding viscosity reduction agents. The device comprises casing, tubing, and a hollow sucker rod. The hollow sucker rod is used to introduce surface thermal fluid into the heavy oil zone. Before entering the heavy oil zone, the surface thermal fluid is agitated by a stirrer. The agitated thermal fluid then flows into the heavy oil zone, reducing the viscosity of the heavy oil and thereby improving oil recovery efficiency. Chemical viscosity reducers are typically injected into the casing annulus (the gap between the tubing and the outer casing). At the dynamic fluid level, they intersect and mix with the formation fluid. The degree of mixing between the formation fluid and the viscosity reducer downhole directly affects the on-site viscosity reduction effect. Utility Model Content

[0004] The purpose of the utility model is to provide an oil well pump, which solves the problem that the viscosity of heavy oil is too high and affects normal production due to uneven mixing of heavy oil and viscosity reducer, enhances the mixing degree of heavy oil and viscosity reducer in the well, and achieves a good viscosity reduction effect.

[0005] To achieve the above-mentioned purpose, the utility model provides an oil well pump, including a pumping device for pumping heavy oil during the up and down strokes, the pumping device is arranged in an oil well pipe, the pumping device includes a hollow rod column, the bottom of the hollow rod column is connected to an oil well pump plunger, when the oil well pump is working, the hollow rod column drives the oil well pump plunger to complete the up and down strokes, the bottom of the oil well pump plunger is connected to an oil pounding column for pounding oil in the oil well pipe during the up and down strokes, and the oil pounding column is provided with a plurality of flow holes for allowing a viscosity reducer to flow out.

[0006] Furthermore, the bottom of the tail pipe of the oil pumping string is also connected to a stirring device for stirring the heavy oil during the pumping process.

[0007] Furthermore, the stirring device includes a stirring drum, in which spiral swirl blades extending up and down are fixed, and the heavy oil flows through the swirl blades in the stirring drum during the pumping process.

[0008] Furthermore, the oil tamping column is a hollow column.

[0009] Furthermore, the hollow cylinder is provided with an oil outlet at the center of the lower end.

[0010] Furthermore, the flow holes include circular flow holes and elongated flow holes.

[0011] Furthermore, the elongated flow holes are evenly distributed along the circumferential direction on the tube wall of the oil tamping column, and the elongated flow holes are located below the circular flow holes.

[0012] Furthermore, the oil ramming rod is detachably connected to the bottom of the oil well pump plunger.

[0013] Furthermore, the oil ramming rod is fixed to the bottom of the oil well pump plunger by means of a threaded connection.

[0014] Beneficial effect: The utility model provides a new oil pump, including a pumping device, a hollow rod column on the pumping device is installed in the oil pumping pipe column, and an oil ramming column is provided at the bottom of the oil pump plunger for pounding oil and taking into account the outflow of viscosity reducer. The oil ramming column reciprocates up and down with the plunger during the up and down strokes, and can send the viscosity reducer into deeper layers while stirring and mixing the viscosity reducer and heavy oil in the oil pumping pipe column sucked up, thereby enhancing the mixing degree of the viscosity reducer and heavy oil, improving the pumping efficiency, and saving manpower time. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a structural diagram of an embodiment of the oil well pump of the present utility model;

[0016] Figure 2 for Figure 1 Schematic diagram of the structure of the medium ramming oil column;

[0017] Figure 3 for Figure 1 Schematic diagram of the structure of the stirring device.

[0018] In the figure: 1. Oil well pump; 101. Hollow rod; 102. Oil well pump plunger; 11. Oil ramming column; 111. Circular flow hole; 112. Long strip flow hole; 113. Oil outlet; 12. Stirring device; 121. Swirl blade; 122. Stirring drum; 2. Oil well pumping string; 3. Joint; 4. Pumping direction. DETAILED DESCRIPTION

[0019] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0020] The oil pump of the utility model is mainly aimed at an oil pump that uses a wellbore chemical viscosity reduction process to add a certain amount of water-soluble surfactant to the wellbore, so as to avoid low or impossible heavy oil extraction efficiency due to uneven mixing of the viscosity reducer and the heavy oil, thereby affecting the overall production pumping efficiency.

[0021] Therefore, the utility model provides a new oil well pump, which acts on the heavy oil in the oil well pipe by utilizing the up and down reciprocating motion of the plunger when the oil well pump is working, so that the heavy oil and the viscosity reducer are fully mixed, thereby enhancing the mixing degree of the viscosity reducer and the heavy oil to a certain extent and improving the pumping efficiency.

[0022] Based on the above main concepts, embodiments are provided below for illustration.

[0023] like Figure 1 As shown, the oil well pump 1 in the embodiment includes a pumping device for pumping heavy oil during the up and down strokes. The pumping device is arranged in the oil well string 2 and includes a hollow rod string 101. The bottom of the hollow rod string 101 is connected to the oil well pump plunger 102. When the oil well pump 1 is in operation, the hollow rod string 101 drives the oil well pump plunger 102 to complete the up and down strokes. During the up and down strokes, the formation produced fluid is pumped according to the pressure. Figure 1 The pumping direction 4 indicated by the middle arrow enters the pumping string 2 from bottom to top to complete the collection of the formation produced fluid. When it is necessary to pump some super-heavy oil and high-condensate oil blocks, in order to ensure that the heavy oil in the well can be smoothly extracted, in one embodiment of the utility model, a wellbore chemical viscosity reduction process is used to reduce the viscosity of the heavy oil in the well. The bottom of the oil pump plunger 102 is connected to a ramming column 11 for pounding the oil in the pumping string 2 during the up and down strokes. The ramming column 11 is provided with multiple flow holes that allow the drug in the hollow rod column 101 to flow out. When the upper end of the ramming column 11 is connected to the hollow rod column 101, it can provide an injection channel for the drug. The ramming column 11 can inject the viscosity reducer into the pumping string 2 near the bottom during the up and down strokes of the oil pump plunger 102.

[0024] In addition, in order to ensure that the injected viscosity reducer can be better mixed with the heavy oil, the bottom of the tail pipe of the pumping string 2 is also connected to a stirring device 12 for stirring the heavy oil during the pumping process. Figure 1 As shown, the stirring device 12 is connected to the bottom of the tail pipe of the pumping pipe string 2 through a joint 3. The joint 3 is a hollow casing with an internal thread. The upper end of the joint 3 is connected to the bottom of the pumping pipe string 2, and the lower end is connected to the stirring device 12 by tightening the threads.

[0025] The stirring device 12 mixes the pumped heavy oil and the viscosity reducer. In one embodiment, the stirring device 12 is a stirring drum 122, and a rotating blade is installed in the stirring drum 122. The rotating blade is driven by a motor to mix the pumped heavy oil and the viscosity reducer. Considering that this setting method is relatively cumbersome and has corresponding requirements for installation space, it is also necessary to consider that the life of the motor may affect the mixing degree and thus the pumping efficiency. Therefore, if Figure 2 As shown, in a more preferred embodiment, the stirring device 12 includes a stirring drum 122, in which spiral swirl blades 121 extending vertically are fixed. The two ends of the swirl blades 121 are connected and fixed to the two ends of the stirring drum 122 by welding. During the pumping process, the mixture of heavy oil and viscosity reducer enters the stirring drum 122 from bottom to top. The swirl blades 121 in the stirring drum 122 stir and mix the heavy oil and viscosity reducer by changing the flow direction of the mixture.

[0026] In addition to considering the effect of the stirring device 12 on the mixing degree of the heavy oil and the viscosity reducer, the uniformity and injection rate of the viscosity reducer should also be considered to further improve the pumping rate. Figure 2 As shown, in one embodiment, the oil-tamping column 11 is a hollow cylinder. Compared with injecting the viscosity reducer only through the flow hole of the oil-tamping column 11, the oil-tamping column 11 in the shape of a hollow cylinder can allow the oil-tamping column 11 to inject a larger dose of viscosity reducer during the up and down movement of the hollow rod column 101, thereby ensuring that the amount of viscosity reducer passing through the flow hole is relatively more, and ensuring the uniformity of the viscosity reducer during the injection process. In order to prevent the mixture of viscosity reducer and heavy oil from entering the oil-tamping column 11 through the flow hole during the up and down stroke of the oil-tamping column 11, in one embodiment, the hollow cylinder is provided with an oil outlet 113 at the center position of the lower end. The provision of the oil outlet 113 prevents the mixture entering the oil-tamping column 11 from generating residue.

[0027] The shape of the flow hole on the oil tamping column 11 can be any shape that can be processed, such as Figure 3As shown, in one embodiment, the flow holes include circular flow holes 111 and elongated flow holes 112. The viscosity reducer is injected into the well more evenly through the flow holes to achieve a better viscosity reduction effect. In one embodiment, the elongated flow holes 112 are evenly distributed along the circumferential direction on the outer side of the oil ramming column 11, the elongated flow holes 112 are located below the circular flow holes 111, and there is a certain angle of deviation between the elongated flow holes 112 and the center line of the oil ramming column 11. Since the oil ramming column 11 is a hollow cylinder, when the oil pump plunger 102 drives the oil ramming column 11 to move up and down, the oil ramming column 11 body remixes the heavy oil and viscosity reducer pumped out of the pumping pipe 2. In addition, during the up and down strokes, the heavy oil and viscosity reducer can also be squeezed and pumped through the flow holes, which to a certain extent enhances the mixing degree of the heavy oil and viscosity reducer.

[0028] In order to facilitate parts replacement and maintenance and reduce hardware costs, in a more preferred embodiment, the oil ramming rod 11 is detachably connected to the bottom of the oil well pump plunger 102. Specifically, an external thread is provided on the outer side of the upper half of the oil ramming rod 11, and it is connected to the bottom of the oil well pump plunger 102 by a threaded connection.

[0029] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be based on the claims. Any equivalent structural changes made using the description and drawings of the present invention shall also be included in the scope of protection of the present invention.

Claims

1. A well pump, characterized in that: The invention comprises a pumping device for pumping heavy oil during the up and down strokes, the pumping device being arranged in a pumping string and comprising a hollow rod string, the bottom of which is connected to a pumping pump plunger, and when the pumping pump is in operation, the hollow rod string drives the pumping pump plunger to complete the up and down strokes, the bottom of which is connected to a ramming rod for ramming oil in the pumping string during the up and down strokes, and the ramming rod is provided with a plurality of flow holes for allowing a viscosity reducer to flow out.

2. The oil well pump according to claim 1, characterized in that The bottom of the tail pipe of the oil pumping string is also connected to a stirring device for stirring the heavy oil during the pumping process.

3. The oil well pump according to claim 2, characterized in that: The stirring device comprises a stirring drum, wherein spiral swirl blades extending up and down are fixed in the stirring drum, and during the heavy oil pumping process, the heavy oil flows through the swirl blades in the stirring drum.

4. The oil well pump according to claim 1, characterized in that The oil tamping column is a hollow column.

5. The oil well pump according to claim 4, characterized in that: The hollow cylinder is provided with an oil outlet at the center of the lower end.

6. The oil well pump according to any one of claims 1 to 5, characterized in that: The flow holes include circular flow holes and long strip flow holes.

7. The oil well pump according to claim 6, characterized in that: The long strip flow holes are evenly distributed along the circumferential direction on the tube wall of the oil tamping column, and the long strip flow holes are located below the circular flow holes.

8. The oil well pump according to any one of claims 1 to 5, characterized in that: The oil ramming column is detachably connected to the bottom of the oil well pump plunger.

9. The oil well pump according to claim 6, characterized in that: The oil ramming rod is fixed to the bottom of the oil well pump plunger by means of threaded connection.

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