Oil-gas multiphase pump for conveying thick oil

Abstract

The utility model discloses an oil-gas multiphase pump for conveying thick oil, which relates to the field of multiphase pumps and comprises a base, a screw pump fixedly connected to the top of the base, a filter arranged at the top of the screw pump, an output port at the bottom of the filter communicated with a feed port of the screw pump, the filter comprises a cylinder body, and a filter element arranged in an inner cavity of the cylinder body. The right side of the cylinder body is fixedly connected with a cover plate through bolts, and a discharging port in the left side of the screw pump communicates with a conveying pipe. By arranging the filter and by means of gravity, oil and water enter the pump firstly, then gas is conveyed, the problems that when a traditional screw pump conveys high-gas-content and high-viscosity thick oil, a pipeline is prone to being blocked, and the service life of a stator and a rotor is affected are solved, closed conveying of various materials is achieved, environmental pollution is avoided, and after liquid is conveyed every time, the conveying efficiency is greatly improved. Thickened oil does not exist inside, electric heating is not needed, the thickened oil is prevented from blocking pipeline liquid, the size is small, the structure is simple, and therefore the problems in the background technology are solved.

Description

Technical Field

[0001] The utility model relates to the field of mixed-transfer pumps, in particular to an oil-gas mixed-transfer pump for conveying thick oil. Background Art

[0002] The oil and gas mixed flow pump is the main conveying equipment used in the oil field gathering and transportation process. It mainly transports crude oil containing gas, water, sand, etc. to achieve centralized purification, separation and storage of crude oil. In addition, it can also reduce wellhead pressure and increase single well or regional production. The current oil and gas mixed flow pump is mainly divided into single-screw, twin-screw, three-screw pumps and plunger pumps according to its structural form.

[0003] However, the plunger pumps currently used in oil fields have problems such as too small displacement and low pump efficiency when the gas content is large. The mainstream product for oil and gas mixed transportation in oil fields is the screw pump, which is often used for external transportation and closed oil unloading. However, it also has some problems. First, when the screw is transporting heavy oil, the liquid will be interrupted for a short time, the heavy oil lacks heating and purging, clogs the filter and the pipeline, and the high gas content damages the stator, rotor, and mechanical seal. In addition, most of the existing fully functional oil and gas mixed transportation devices are bulky and expensive, which is not conducive to promotion.

[0004] In view of the above problems, the utility model provides an oil-gas mixed transport pump for transporting thick oil. Utility Model Content

[0005] The utility model aims to provide an oil-gas mixed transport pump for transporting heavy oil. By setting a filter and using gravity, oil and water are first allowed to enter the pump, and then the gas is transported, thereby solving the problem that traditional screw pumps transport high-gas-containing and high-viscosity heavy oil and are prone to clogging pipelines and affecting the service life of stators and rotors, and realizing closed transportation of various materials and avoiding environmental pollution. After each liquid is transported, no heavy oil will be stored inside, no electric heating is required, and heavy oil is prevented from clogging pipeline liquid. The utility model has a small volume and a simple structure, thereby solving the problems in the background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an oil-gas mixed transport pump for transporting thick oil, comprising a base, a screw pump is fixedly connected to the top of the base, a filter is arranged on the top of the screw pump, an output port at the bottom of the filter is connected to a feed port of the screw pump, the filter comprises a cylinder body, a filter element is arranged in the inner cavity of the cylinder body, a cover plate is fixedly connected to the right side of the cylinder body by bolts, a discharge port on the left side of the screw pump is connected to a delivery pipe, a check valve is arranged on the surface of the delivery pipe, and a gate valve is connected to the left end of the delivery pipe.

[0007] Furthermore, a control cabinet is fixedly connected to the right side of the front side of the top of the base, and a liquid level transmitter is fixedly connected to the bottom of the front side of the cylinder body.

[0008] Furthermore, the top of the delivery pipe is connected to an oil return pipe, one end of the oil return pipe away from the delivery pipe is connected to a filter, and a safety valve is sleeved on the surface of the oil return pipe.

[0009] Furthermore, the left end of the gate valve is connected to a discharge pipe, and the left end of the discharge pipe is fixedly connected to a sealing flange.

[0010] Furthermore, a pressure transmitter is fixedly connected to the top of the delivery pipe, and an oil unloading pipe is connected to the top of the cylinder body.

[0011] Furthermore, the front side and the rear side of the bottom of the cylinder body are fixedly connected with support columns, and the bottom of the support columns is fixedly connected to the base.

[0012] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0013] The utility model provides an oil-gas mixed transport pump for conveying heavy oil. The filter has two functions of filtering and inlet gas-liquid mixing buffering, which reduces the ground foundation area, is conducive to the heavy oil entering the screw pump with the help of gravity, shortens the pipeline, avoids the pipeline being blocked by heavy oil, eliminates the heavy oil electric heater, and reduces safety hazards. The filter is installed horizontally, and the filter element can be pulled out horizontally by disassembling the cover plate, which is convenient for replacing the filter element and reduces the workload. A liquid level transmitter is installed at the bottom of the filter to realize automatic control and ensure safe operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the utility model;

[0015] Figure 2 It is a partial cross-sectional view of the cylinder body of the utility model;

[0016] Figure 3 It is a structural side view of the utility model;

[0017] Figure 4 It is a top view of the structure of the utility model.

[0018] In the figure: 1. base; 2. screw pump; 3. filter; 301. cylinder body; 302. filter element; 303. cover plate; 4. delivery pipe; 5. check valve; 6. gate valve; 7. control cabinet; 8. liquid level transmitter; 9. oil return pipe; 10. safety valve; 11. discharge pipe; 12. pressure transmitter; 13. oil unloading pipe. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] In order to solve the technical problems of traditional screw pumps transporting high-gas and high-viscosity heavy oil, which are easy to block the pipeline and occupy a large ground area, such as Figure 1-4 As shown, the following preferred technical solutions are provided:

[0021] A mixed oil and gas pump for conveying thick oil comprises a base 1, a screw pump 2 is fixedly connected to the top of the base 1, a filter 3 is arranged on the top of the screw pump 2, an output port at the bottom of the filter 3 is connected to a feed port of the screw pump 2, the filter 3 comprises a cylinder 301, a filter element 302 is arranged in the inner cavity of the cylinder 301, a cover plate 303 is fixedly connected to the right side of the cylinder 301 by bolts, a discharge port on the left side of the screw pump 2 is connected to a conveying pipe 4, a check valve 5 is sleeved on the surface of the conveying pipe 4, and a gate valve 6 is connected to the left end of the conveying pipe 4.

[0022] Specifically, the filter 3 has two functions: filtering and inlet gas-liquid mixing buffering, which reduces the ground foundation area, is conducive to the heavy oil entering the screw pump 2 with the help of gravity, shortens the pipeline, avoids the heavy oil clogging the pipeline, eliminates the heavy oil electric heater, and reduces safety hazards. The filter 3 is installed horizontally, and the filter element 302 can be pulled out horizontally through the removal of the cover plate 303, which is convenient for replacing the filter element 302 and reduces the workload. The liquid level transmitter 8 is installed at the bottom of the filter 3 to realize automatic control and ensure safe operation.

[0023] In order to solve the technical problems that the oil and water balance in the cylinder 301 is difficult to monitor and the pressure in the delivery pipe 4 is too high and may cause danger, as Figure 1 and Figure 3 As shown, the following preferred technical solution is provided: a control cabinet 7 is fixedly connected to the right side of the top front side of the base 1, a liquid level transmitter 8 is fixedly connected to the bottom of the front side of the cylinder body 301, the top of the delivery pipe 4 is connected to an oil return pipe 9, the end of the oil return pipe 9 away from the delivery pipe 4 is connected to the filter 3, a safety valve 10 is sleeved on the surface of the oil return pipe 9, the left end of the gate valve 6 is connected to a discharge pipe 11, and the left end of the discharge pipe 11 is fixedly connected to a sealing flange.

[0024] Specifically, the electronic equipment of the entire equipment can be controlled through the control cabinet 7, the oil and water residue inside the cylinder 301 can be monitored through the liquid level transmitter 8, and when the pressure inside the delivery pipe 4 is too high, part of the oil and gas in the delivery pipe 4 can be re-delivered to the filter 3 through the return oil pipe 9 and the safety valve 10, and the discharge pipe 11 can be conveniently connected to the oil pipeline through the sealing flange.

[0025] In order to solve the technical problem of automatic detection of the internal pressure of the delivery pipe 4, Figure 1 , Figure 3 and Figure 4 As shown, the following preferred technical solution is provided: a pressure transmitter 12 is fixedly connected to the top of the delivery pipe 4, an oil unloading pipe 13 is connected to the top of the cylinder body 301, support columns are fixedly connected to the front and rear sides of the bottom of the cylinder body 301, and the bottom of the support columns is fixedly connected to the base 1.

[0026] Specifically, the pressure inside the delivery pipe 4 can be detected through the pressure transmitter 12, the oil and gas can be conveniently delivered to the filter 3 through the oil unloading pipe 13, and the cylinder body 301 can be conveniently supported by the support column to improve the stability of its installation.

[0027] Working principle: When in use, heavy oil, gas and water enter the filter 3 through the oil unloading pipe 13. The oil and water preferentially enter the lower half of the cylinder 301 through the filter element 302 with a perforated plate and contact the liquid level transmitter 8. Most of the liquid directly enters the screw pump 2 by gravity, while most of the gas temporarily stays inside the cylinder 301. Since the liquid part enters the screw pump 2 first, the impact of the gas on the stator, rotor and seal of the screw pump 2 is reduced, and the service life of the screw pump 2 is increased. The gas enters the screw pump 2 later. The operation of the screw pump 2 forms suction, and oil, gas and water continuously enter to complete the transportation process. The oil, gas and water are transported to the discharge pipe 11 through the stator and rotor, and then the oil and gas mixed transportation is completed through the check valve 5.

[0028] In summary, the oil-gas mixed transport pump for transporting heavy oil, through the coordinated use of the screw pump 2, the filter 3, the cylinder body 301, the filter element 302, the cover plate 303, the delivery pipe 4, the check valve 5 and the gate valve 6, solves the technical problems that the traditional screw pump 2 is easy to block the pipeline and occupy a large ground area when transporting high-gas and high-viscosity heavy oil.

[0029] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0030] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An oil-gas mixed transport pump for transporting thick oil, comprising a base (1), characterized in that: A screw pump (2) is fixedly connected to the top of the base (1), a filter (3) is arranged on the top of the screw pump (2), an output port at the bottom of the filter (3) is communicated with a feed port of the screw pump (2), the filter (3) comprises a cylinder (301), a filter core (302) is arranged in the inner cavity of the cylinder (301), a cover plate (303) is fixedly connected to the right side of the cylinder (301) by means of bolts, a delivery pipe (4) is communicated with the delivery pipe (2), a check valve (5) is sleeved on the surface of the delivery pipe (4), and a gate valve (6) is communicated with the left end of the delivery pipe (4).

2. The oil-gas mixed transport pump for transporting heavy oil according to claim 1, characterized in that: A control cabinet (7) is fixedly connected to the right side of the front top of the base (1), and a liquid level transmitter (8) is fixedly connected to the bottom of the front side of the cylinder body (301).

3. The oil-gas mixed transport pump for transporting thick oil according to claim 1, characterized in that: The top of the delivery pipe (4) is connected to an oil return pipe (9), one end of the oil return pipe (9) away from the delivery pipe (4) is connected to a filter (3), and a safety valve (10) is sleeved on the surface of the oil return pipe (9).

4. The oil-gas mixed transport pump for transporting thick oil according to claim 1, characterized in that: The left end of the gate valve (6) is connected to a discharge pipe (11), and the left end of the discharge pipe (11) is fixedly connected to a sealing flange.

5. The oil-gas mixed transport pump for transporting heavy oil according to claim 1, characterized in that: The top of the delivery pipe (4) is fixedly connected to a pressure transmitter (12), and the top of the cylinder body (301) is connected to an oil unloading pipe (13).

6. The oil-gas mixed transport pump for transporting thick oil according to claim 1, characterized in that: The front and rear sides of the bottom of the cylinder body (301) are fixedly connected to support columns, and the bottom of the support columns is fixedly connected to the base (1).

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