阅读说明：本技术 一种油田注水二次增压泵 (Secondary booster pump for oilfield water injection ) 是由 刘航 薛金瑞 于 2020-07-06 设计创作，主要内容包括：一种油田注水二次增压泵,属于石油注水开采技术领域,所述增压泵包括增压系统和液压驱动系统,所述增压系统包括一缸体,所述缸体内设有活塞体,所述活塞体中部与缸体内部紧密贴合,所述活塞体左右两侧设有柱塞杆,所述柱塞杆左右两端部与缸体两端内部形成相互隔离的高压水腔,所述缸体内于左右两侧的柱塞杆中部设有封堵装置,所述活塞体与左右两侧的封堵装置之间形成相互隔离的液压油腔,所述液压油腔与液压驱动系统相连,所述缸体两端于高压水腔端部经进水单向阀与供水网管相连,所述缸体两端于高压水腔上部经出水单向阀与水井相连。本发明利用现有管网的水压压力,再此压力基础上通过增压系统增补压力,使最终水压压力达到水井的注入要求。(The utility model provides an oil field water injection secondary booster pump, belongs to oil water injection exploitation technical field, the booster pump includes turbocharging system and hydraulic drive system, turbocharging system includes a cylinder body, be equipped with the piston body in the cylinder body, the piston body middle part is closely laminated with the cylinder body is inside, the piston body left and right sides is equipped with the plunger rod, the inside high-pressure water cavity that forms mutual isolation in both ends and cylinder body both ends about the plunger rod, the plunger rod middle part in the left and right sides is equipped with plugging device in the cylinder body, form the hydraulic pressure oil pocket of mutual isolation between the plugging device of piston body and left and right sides, the hydraulic pressure oil pocket links to each other with hydraulic drive system, the cylinder body both ends link to each other with the water supply network pipe through the check valve that intakes in high-pressure water cavity tip, the. The invention utilizes the water pressure of the existing pipe network, and supplements the pressure through the pressurization system on the basis of the pressure, so that the final water pressure reaches the injection requirement of the well.)

1. The utility model provides an oil field water injection secondary booster pump, includes water supply network pipe (35), well (36), its characterized in that: the booster pump comprises a boosting system and a hydraulic driving system, the boosting system comprises a cylinder body, a piston body (14) is arranged in the cylinder body, the middle of the piston body (14) is tightly attached to the inside of the cylinder body, plunger rods are arranged on the left side and the right side of the piston body (14), high-pressure water cavities which are mutually isolated are formed in the left end portion and the right end portion of each plunger rod and the inside of the two ends of the cylinder body, a plugging device is arranged in the middle of each plunger rod on the left side and the right side of the cylinder body, hydraulic oil cavities which are mutually isolated are formed between the piston body (14) and the plugging devices on the left side and the right side, the hydraulic oil cavities are connected with the hydraulic driving system, the two ends of the cylinder body are connected with a water supply network pipe (35) through a water inlet one-way valve (8).

2. The secondary booster pump for oilfield flooding of claim 1, characterized in that: the hydraulic drive system comprises a prime motor (1), a hydraulic pump (2), a safety valve (3), a hydraulic filter (4), a hydraulic oil tank (5) and a hydraulic reversing valve (6), wherein an output shaft end of the prime motor (1) is connected with an input shaft end of the hydraulic pump (2), an oil inlet of the hydraulic pump (2) is connected with one end of the filter (29), the other end of the filter (29) is connected with the hydraulic oil tank (5), an outlet of the hydraulic pump (2) is divided into two paths, one path is connected with an oil inlet port of the hydraulic reversing valve (6), the other path is connected with an inlet of the safety valve (3), an oil return port of the hydraulic reversing valve (6) is converged with an outlet of the safety valve (3) and then is connected with one end of the hydraulic filter (4), the other end of the hydraulic filter (4) is connected with the hydraulic oil tank (5), and working oil ports of the hydraulic reversing valve (6) are respectively connected with hydraulic oil chambers at .

3. The secondary booster pump for oilfield flooding of claim 2, wherein: the hydraulic reversing valve (6) is connected with the electric cabinet (7), a position detection element (13) is arranged at the position of the piston detection position on the cylinder body, and the position detection element (13) is connected with the electric cabinet (7); the position detection element (13) is arranged on the hydraulic oil cavity or the high-pressure water cavity, and the position detection element (13) is a proximity switch or a mechanical travel switch.

4. The secondary booster pump for oilfield flooding of claim 2, wherein: the prime motor (1) is an electric motor or an engine, the electric motor is a constant speed motor or a speed regulating motor, and the engine is a fuel engine; the hydraulic pump (2) is a fixed displacement pump or a variable displacement pump and structurally is a plunger pump or a gear pump or a vane pump.

5. The secondary booster pump for oilfield flooding of claim 1, characterized in that: the lower part of the high-pressure water cavity is provided with a water discharge hole.

6. The secondary booster pump for oilfield flooding of claim 1, characterized in that: the cylinder body includes water pressure cylinder body (10), transition connector (11), hydraulic cylinder body (12) both ends link to each other with transition connector (11), transition connector (11) both ends link to each other with water pressure cylinder body (10), transition connector (11) internal surface is cylindrical cavity structure, be equipped with hydraulic seal spare and water pressure sealing member in transition connector (11), hydraulic seal spare seals the hydraulic pressure oil pocket, water pressure sealing member seals the high pressure water chamber, transition connector (11) inside is equipped with direction technology component (16).

7. The secondary booster pump for oilfield flooding of claim 6, wherein: and a leakage hole (25) and an observation hole (31) which are communicated with each other are arranged between the hydraulic sealing piece and the hydraulic sealing piece on the cylinder body.

8. The secondary booster pump for oilfield flooding of claim 1, characterized in that: and a shaft shoulder (26) or a collar or a stop block which has the same action with the shaft shoulder (26) is arranged on the piston body (14).

9. The secondary booster pump for oilfield flooding of claim 1, characterized in that: and two ends of the piston body (14) are provided with piston cylinders (30), and the clearance on the contact length between the inner wall surface of the cylinder body and the piston cylinders (30) is less than 5 mm.

10. The secondary booster pump for oilfield flooding of claim 9, wherein: the hardness of the piston cylinder (30) is HRC 35-HRC 75, and the roughness is Ra0.1-Ra0.6.

Technical Field

The invention belongs to the technical field of oil water injection exploitation, and particularly relates to a secondary booster pump for water injection in an oil field.

Background

The water injection exploitation refers to the process of oil field exploitation in which water is injected into an oil reservoir through a special water injection well to maintain or restore the pressure of the oil reservoir, so that the oil reservoir has strong driving force to improve the exploitation rate and recovery ratio of the oil reservoir. The water injection system and the main process flow are a water injection pump station → a water injection pipe network → a water distribution room → an injection well. The 'single-pipe multi-well water distribution process' is a mode commonly adopted by domestic oil fields, namely: one or more high-pressure pumps with large discharge capacity (the capacity of a dragging motor is usually hundreds of kilowatts to several megawatts) are installed in a water injection pump station to intensively provide a high-pressure water source, and high-pressure water pumped by the pump station is distributed to a plurality of water injection rooms through a water injection pipe network, then distributed to each water injection well through the water injection rooms and finally injected into an underground oil reservoir. At the beginning of the construction of a water injection system, the water injection pressure meets the requirements of each water injection well, but as the water injection age increases, the water injection well can generate a blocking phenomenon due to a plurality of reasons, so that the phenomenon of short injection of individual wells is caused, namely, the pressure of a water injection pipe network is not high enough and is not enough to be injected into the well. The phenomenon of under-injection will affect the exploitation of petroleum. With the continuous exploitation, the phenomenon of insufficient injection can be highlighted in a larger range.

The current solutions are:

1. and fracturing again, and dredging underground blockage by fracturing. The method has obvious effect, but has high cost and great technical difficulty, and particularly needs to pay attention to controlling the fracturing direction, otherwise, water channeling is easily caused.

2. Acidification is used for removing blockage, and acidic chemical agents are injected into the water well to soften underground blockage, so that the permeability is improved. This solution has the risk of causing environmental pollution and the blockage-relieving effect is not long-lasting.

3. The water injection system is boosted and transformed, and mainly comprises a large water injection pump and a pipe network for improving pressure. When a large number of water wells in the district of the water injection station have high-pressure short injection, the transformation is considered. However, the cost of the system modifications is obviously enormous (pumps, pipelines, meters, etc. need to be replaced with higher pressure ratings) and raising the overall grid pressure just to meet the individual high-pressure wells is not economical, resulting in a large waste of electrical energy.

4. The secondary supercharging equipment is basically a new product developed in recent years, and at present, two types are probably provided:

the first is to use the hydraulic pressure of the pipe network to drive the hydraulic pressure booster, its disadvantage first, need lay the low-pressure return line specially; and secondly, a large number of self-designed and processed parts are needed for the control valve and the like, the self-made part has poor lubricity, the reliability of the self-made part is difficult to guarantee, the practical applicability is poor, and the popularization is difficult.

The other method is to drive the hydraulic pressure booster by using a hydraulic method, and the basic idea of the scheme is good, because the hydraulic technology is mature, the reliability of the whole transmission link is improved.

However, the existing driving supercharging device still has the defects of not simple enough, low system efficiency, large energy consumption and the like in the design of a system. For example, in some designs, a solenoid valve (switching valve) connected in series in a hydraulic control circuit is used to control the operation of the booster, and such designs have the disadvantages of large hydraulic shock and poor synchronization (or coordination) when the solenoid valve is opened. In addition, the throttle valve is designed to control the action speed of the supercharging device, and the throttle speed regulation mode is energy consumption and energy conservation is not achieved. In some designs, a reversing valve is manufactured, and a stepping motor is combined with a lead screw to control the movement of a valve core so as to complete the reversing of the supercharging device.

Disclosure of Invention

In order to solve the technical problems, the invention provides an oil field water injection secondary booster pump based on the fact that the number of under-injected wells in a current oil field is increased and the layout characteristics of the existing water injection pipe network in the oil field are combined, which is characterized in that the water pressure of the existing pipe network is utilized, then the pressure is supplemented through a booster system on the basis of the water pressure, so that the final water pressure reaches the injection requirement of the wells, and the electric energy consumed by the equipment is only the energy required by the supplemented pressure, so that the secondary booster pump is novel high-efficiency energy-saving equipment, and has good economic and social benefits.

The invention adopts the following technical scheme:

the utility model provides an oil field water injection secondary booster pump, includes water supply network pipe, well, the booster pump includes turbocharging system and hydraulic drive system, turbocharging system includes a cylinder body, be equipped with the piston body in the cylinder body, the piston body middle part is closely laminated with the cylinder body is inside, the piston body left and right sides is equipped with the plunger rod, the inside high-pressure water cavity that forms mutual isolation in both ends and the cylinder body both ends about the plunger rod, the plunger rod middle part in the left and right sides is equipped with plugging device in the cylinder body, form the hydraulic pressure oil pocket of mutual isolation between the plugging device of piston body and left and right sides, the hydraulic pressure oil pocket links to each other with hydraulic drive system, the cylinder body both ends link to each other with the water supply network pipe through the check valve that intakes in high-pressure water cavity tip.

Furthermore, the hydraulic driving system comprises a prime motor, a hydraulic pump, a safety valve, a hydraulic filter, a hydraulic oil tank and a hydraulic reversing valve, wherein the output shaft end of the prime motor is connected with the input shaft end of the hydraulic pump, the oil inlet of the hydraulic pump is connected with one end of the filter, the other end of the filter is connected with the hydraulic oil tank, the outlet of the hydraulic pump is divided into two paths, one path is connected with the oil inlet port of the hydraulic reversing valve, the other path is connected with the inlet of the safety valve, the oil return port of the hydraulic reversing valve is converged with the outlet of the safety valve and then connected with one end of the hydraulic filter, the other end of the hydraulic filter is connected with the hydraulic oil tank, and the working oil ports of the hydraulic reversing valve are respectively.

Furthermore, the hydraulic reversing valve is connected with the electric cabinet, a position detection element is arranged at the position of the piston detection position on the cylinder body, and the position detection element is connected with the electric cabinet.

Further, the position detection element is arranged on the hydraulic oil cavity or the high-pressure water cavity, and the position detection element is a proximity switch or a mechanical travel switch.

Further, the prime mover is an electric motor or an engine, the electric motor is a constant speed motor or a speed regulating motor, and the engine is a fuel engine; the hydraulic pump is a fixed displacement pump or a variable displacement pump and structurally is a plunger pump or a gear pump or a vane pump.

Furthermore, a water discharge hole is formed in the lower portion of the high-pressure water cavity.

Further, the cylinder body includes water pressure cylinder body, transition connector, hydraulic cylinder body both ends link to each other with the transition connector, transition connector both ends link to each other with the water pressure cylinder body, transition connector internal surface is cylindrical cavity structure, the transition connector is equipped with hydraulic seal and water pressure sealing member, and hydraulic seal seals the hydraulic pressure oil pocket, water pressure sealing member seals the high pressure water chamber.

Furthermore, a guiding process element is arranged inside the transition connecting body.

Furthermore, a leakage hole and an observation hole which are communicated with each other are arranged between the hydraulic sealing element and the hydraulic sealing element on the cylinder body.

Furthermore, a shaft shoulder or a lantern ring or a stop block which has the same action with the shaft shoulder is arranged on the piston body.

Further, both ends of the piston body are provided with piston cylinders, and the gap between the inner wall surface of the cylinder body and the contact length of the piston cylinders is less than 5 mm.

Furthermore, the hardness of the piston cylinder is HRC 35-HRC 75, and the roughness is Ra0.1-Ra0.6.

The basic method is to pressurize the water pressure by a pressurization system. The water pressure of the pipe network directly acts on two ends of the piston in the water pressure cavity respectively to form balance. The main technical route is that a motor and a hydraulic pump provide hydraulic driving force, and the piston body is controlled by a hydraulic reversing valve to continuously reverse left and right. The water pressure outlet of the booster is provided with a flow distribution one-way valve, and the water pressure can be completely pressurized along with the continuous reversing motion of the piston.

The invention has the advantages and effects that:

the water injection flow of the secondary booster pump for oil field water injection can be continuously adjusted, the investment and use cost is low, the volume is small, the weight is light, and the consumption of raw materials is low; the installation is convenient, and the plug-in and the connection of two water pipes can be used; the efficiency is high, the energy consumption is low, and the energy consumption is only the necessary energy consumption required for pressurizing a specific water quantity; the parts are extremely simple, the reliability is high, and the durability is high; the parts have high standardization degree, good interchangeability and good maintenance characteristic.

Drawings

FIG. 1 is a schematic diagram of a secondary booster pump for oilfield flooding in one embodiment of the present invention;

FIG. 2 is an enlarged view of portion A of FIG. 1;

FIG. 3 is a schematic view showing the structure of the position detecting element mounted on the hydraulic cylinder in embodiment 2;

FIG. 4 is a schematic structural diagram of an integrated connector in which the transitional connector 1 and the guiding process element are combined into an integrated structure in example 3;

FIG. 5 is a schematic view showing the first and second hydraulic seals installed inside the hydraulic cylinder in embodiment 4;

fig. 6 is a schematic view showing the piston body of the embodiment 5 in a split structure.

The components in the figure: 1. the hydraulic control system comprises a prime motor, a hydraulic pump, a safety valve, a hydraulic filter, a hydraulic oil tank, a hydraulic reversing valve, a hydraulic cylinder, a position detection element, a piston body, a first hydraulic sealing piece, a guide process element, a second hydraulic sealing piece, a support guide element, a position detection element, a piston body, a position detection element, 35. water supply network pipe 36, well.

Detailed Description

The invention is further explained below with reference to the figures and the examples.