阅读说明：本技术 一种双层管用负压抽吸与气举复合作用泵 (Negative pressure suction and gas lift combined action pump for double-layer pipe ) 是由 胡中志 任天生 王磊 阳明君 吴欣袁 岳迎春 李莹 于 2020-04-17 设计创作，主要内容包括：本发明提供了一种双层管用负压抽吸与气举复合作用泵,属于井下工具领域,用于设置在双层管的一端以抽吸井内流体,包括内管；内管包括内壳体,和同轴连接的第一活塞与第二活塞；内壳体的内部形成同轴设置的第一腔和第二腔,第一活塞设置在第一腔内,第二活塞设置在第二腔内；第一腔远离第二腔的一端用于接通供气装置；第二腔远离第一腔的一端设置有用于抽吸井内流体进第二腔的第一单向阀,以及将第二腔内的流体送入流出井的排液通道的第二单向阀。能够通过连续性地注入气体,经由气体压力将井内的流体周期性地送入排液通道内,而注入的气体经由排气孔或泄压阀以气举的方式帮助井内流体的排出,能够适用于所有类型井的流体排出。(The invention provides a negative pressure suction and gas lift combined action pump for a double-layer pipe, which belongs to the field of downhole tools and is used for being arranged at one end of the double-layer pipe to suck fluid in a well, and comprises an inner pipe; the inner tube comprises an inner shell, a first piston and a second piston which are coaxially connected; a first cavity and a second cavity which are coaxially arranged are formed in the inner shell, a first piston is arranged in the first cavity, and a second piston is arranged in the second cavity; one end of the first cavity, which is far away from the second cavity, is used for connecting the air supply device; one end of the second cavity far away from the first cavity is provided with a first one-way valve for pumping fluid in the well into the second cavity and a second one-way valve for sending the fluid in the second cavity into a liquid discharge channel flowing out of the well. The fluid in the well can be periodically sent into the drainage channel by continuously injecting gas and periodically sending the fluid into the well through gas pressure, and the injected gas assists the drainage of the fluid in the well in a gas lift mode through the vent hole or the pressure relief valve, so that the fluid drainage method can be suitable for the fluid drainage of all types of wells.)

1. A double-layer pipe negative pressure suction and gas lift combined action pump is used for being arranged at one end of a double-layer oil pipe to suck fluid in a well and is characterized by comprising an inner pipe;

the inner tube comprises an inner shell, a first piston and a second piston which are coaxially connected;

a first cavity and a second cavity which are coaxially arranged are formed in the inner shell, the first piston is arranged in the first cavity, and the second piston is arranged in the second cavity;

one end of the first cavity, which is far away from the second cavity, is used for connecting an air supply device;

one end of the second cavity, which is far away from the first cavity, is provided with a first one-way valve for pumping fluid in the well into the second cavity and a second one-way valve for sending the fluid in the second cavity into a liquid drainage channel;

the second piston is provided with an exhaust valve for exhausting gas in the gas-liquid mixed fluid;

a pressure relief valve is arranged at one end of the first cavity, which is far away from the second cavity, and the pressure relief valve can communicate the first cavity with the liquid drainage channel;

one end of the inner wall of the first cavity, which is close to the second cavity, is provided with an exhaust hole which is communicated with the first cavity and the outer side of the inner shell.

2. The double-layer tube negative pressure suction and gas lift combined action pump as claimed in claim 1, further comprising an outer tube;

the outer pipe is coaxially fixed on the outer side of the inner pipe, and the annular liquid drainage channel is formed between the outer pipe and the inner pipe.

3. The negative pressure suction and gas lift combined action pump for the double-layer pipe as claimed in claim 2, wherein the outer pipe is provided with partition plates on two sides corresponding to the second one-way valves, the partition plates are hermetically connected with the inner shell, and an exposed groove for communicating the first one-way valve in the well is formed between the partition plates corresponding to two adjacent second one-way valves.

4. The double-layer tube negative pressure suction and gas lift combined action pump as claimed in claim 1, wherein the inner housing comprises a first housing section and a second housing section which are coaxially and fixedly connected;

the first cavity is formed in the first shell section, and the second cavity is formed in the second shell section;

the first shell section is connected with the second shell section through a connecting short section, and a flow through hole communicated with the first cavity and the second cavity is formed in the connecting short section.

5. The double-layer pipe negative pressure suction and gas lift combined action pump as claimed in claim 4, wherein a return spring is further arranged in the first cavity, one end of the return spring acts on the first piston, and the other end of the return spring acts on the connecting short joint.

6. The double-layer tube negative pressure suction and gas lift combined action pump as claimed in claim 1, wherein the first piston is a hollow buoyant piston.

Technical Field

The invention relates to the field of downhole tools, in particular to a negative pressure suction and gas lift combined action pump for a double-layer pipe.

Background

In the later production period of the oil-gas well, when the formation energy is insufficient or when the low-permeability low-production low-efficiency well is produced, an artificial lifting measure is usually adopted to maintain the normal production of the oil well, or bottom hole accumulated liquid is discharged to recover the production of the oil well. The common artificial lifting measures mainly comprise five lifting modes such as a sucker rod pump, a hydraulic pump, an electric submersible pump, a screw pump, a gas lift and the like, and because the lifting principle of each mode is different, the drainage capacity and the application range of the modes are different, and a universal lifting mode which can solve all the problems encountered in the later production of the oil-gas well is not provided.

Disclosure of Invention

The invention provides a negative pressure suction and gas lift combined action pump for a double-layer pipe, and aims to solve the problems in the prior art.

The invention is realized by the following steps:

a double-layer pipe negative pressure suction and gas lift combined action pump is used for being arranged at one end of a double-layer pipe to suck well fluid and comprises an inner pipe;

the inner tube comprises an inner shell, a first piston and a second piston which are coaxially connected;

a first cavity and a second cavity which are coaxially arranged are formed in the inner shell, the first piston is arranged in the first cavity, and the second piston is arranged in the second cavity;

one end of the first cavity, which is far away from the second cavity, is used for connecting an air supply device;

one end of the second cavity, which is far away from the first cavity, is provided with a first one-way valve for pumping fluid in the well into the second cavity and a second one-way valve for sending the fluid in the second cavity into a liquid discharge channel flowing out of the well.

In one embodiment of the invention, further comprising an outer tube;

the outer pipe is coaxially fixed on the outer side of the inner pipe, and the annular liquid drainage channel is formed between the outer pipe and the inner pipe.

In one embodiment of the invention, the outer pipe is provided with partition plates on two sides corresponding to the second one-way valves, the partition plates are connected with the inner shell in a sealing manner, and an exposed groove used for the first one-way valve communication well is formed between the partition plates corresponding to two adjacent second one-way valves.

In one embodiment of the invention, the inner housing comprises a first housing section and a second housing section fixedly connected coaxially;

the first cavity is formed in the first shell section, and the second cavity is formed in the second shell section;

the first shell section is connected with the second shell section through a connecting short section, and a flow through hole communicated with the first cavity and the second cavity is formed in the connecting short section.

In an embodiment of the present invention, a return spring is further disposed in the first cavity, and one end of the return spring acts on the first piston, and the other end of the return spring acts on the connection nipple.

In one embodiment of the invention, the first piston is a hollow buoyant piston.

In an embodiment of the present invention, the second piston is provided with an exhaust valve, and the exhaust valve communicates a side of the second piston away from the first cavity with a side of the second piston away from the first cavity.

In an embodiment of the present invention, an exhaust hole is disposed at an end of the inner wall of the first cavity close to the second cavity, and the exhaust hole communicates the first cavity with an outside of the inner housing.

In an embodiment of the present invention, a pressure relief valve is disposed at an end of the first chamber away from the second chamber, and the pressure relief valve can communicate the first chamber and the liquid discharge channel.

The invention has the beneficial effects that: the double-layer pipe negative pressure suction and gas lift combined pump provided by the embodiment can periodically feed fluid in a well into the liquid discharge channel by continuously injecting gas and driving the piston through gas pressure and reset acting force, and meanwhile, the gas periodically discharged from the air exhaust hole by the pneumatic piston enters the liquid discharge channel to help the fluid in the liquid discharge channel to be discharged in a gas lift mode; the buoyancy type exhaust valve arranged on the second piston can exhaust gas mixed in the sucked fluid, so that the stability of the liquid discharge efficiency of the pump can be maintained; when the liquid in the liquid discharge channel is excessive, and the gas injection pressure is too high to exceed the critical pressure of the pressure release valve, the pressure release valve is opened, the piston stops moving, the injected gas helps the discharge of the fluid in the well in a gas lift mode through the pressure release valve, and after the pressure is reduced, the pressure release valve is closed, and the gas continues to drive the piston to suck the fluid; such a pump can be adapted for fluid discharge from all types of wells.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural diagram of a first view angle of a double-layer tube negative pressure suction and gas lift combined action pump according to an embodiment of the present invention;

FIG. 2 is a sectional view taken along line II-II of FIG. 1;

FIG. 3 is an enlarged view of a portion of area A of FIG. 2;

FIG. 4 is a partial enlarged view of area B of FIG. 2;

FIG. 5 is an enlarged view of a portion of region C of FIG. 2;

FIG. 6 is a schematic diagram illustrating a second perspective view of a double-layer tube negative pressure suction and gas lift combined action pump according to an embodiment of the present invention;

FIG. 7 is a schematic diagram illustrating a first view of a double-layer tube vacuum suction and gas lift pump according to a second embodiment of the present invention;

FIG. 8 is a sectional view taken along line VIII-VIII of FIG. 7;

FIG. 9 is an enlarged partial view of the area D in FIG. 8;

FIG. 10 is an enlarged partial view of area E of FIG. 8;

fig. 11 is a partially enlarged view of the region F in fig. 8.

Icon: the 001-double-layer tube is a negative pressure suction and gas lift combined action pump; 010-an inner tube; 030-outer tube; 100-an inner housing; 200-a first piston; 300-a second piston; 110-a first shell section; 130-a second shell section; 111-a first cavity; 131-a second cavity; 150-a connection nipple; 151-first sealing ring; 153-a second seal ring; 155-stop sheet; 1551-flow through holes; 002-double layer tubing connector; 003-axial inflow pipe; 133-a first one-way valve; 135-a second one-way valve; 210-a connecting rod; 011-a liquid discharge channel; 230-a return spring; 1111-exhaust hole; 301-anti-collision rubber; 031-exposing the grooves; 303-exhaust valve; 113-a pressure relief valve; 201-weight loss chamber.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without any creative effort belong to the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms indicating an orientation or positional relationship are based on the orientation or positional relationship shown in the drawings only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; they may be directly connected or indirectly connected through intervening media, or may be connected through the interconnection of two elements or through the interaction of two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature may be directly on or under the second feature or may comprise the first and second features in direct contact, or the first and second features may be in contact not in direct contact but via another feature in between. Also, the first feature being above, on or above the second feature includes the first feature being directly above and obliquely above the second feature, or merely means that the first feature is at a higher level than the second feature. A first feature that underlies, and underlies a second feature includes a first feature that is directly under and obliquely under a second feature, or simply means that the first feature is at a lesser level than the second feature.