CN210858676U

CN210858676U - Automatic drainage gas production device

Info

Publication number: CN210858676U
Application number: CN201921885610.9U
Authority: CN
Inventors: 彭大伟; 尹寿海
Original assignee: Manchi Technology Beijing Co ltd
Current assignee: Manchi Technology Beijing Co ltd
Priority date: 2019-11-05
Filing date: 2019-11-05
Publication date: 2020-06-26
Anticipated expiration: 2029-11-05

Abstract

The utility model provides an automatic drainage gas production device belongs to oil gas field development technical field. The utility model discloses to the shortcoming of the dependence self energy of not thorough, plunger drainage of foam drainage and can not continuous drainage to and the pump trouble appears easily in electric submersible pump and plunger pump drainage and the condition that the pump damaged, the utility model discloses an rely on gas well self to produce gas and provide power, realize the automatic control drainage with pressure controller, use the method of shaft bottom jet pump drainage, realize according to the shaft bottom ponding condition, carry out the function of automatic opening and closing the drainage. The utility model discloses a device mainly comprises three major systems of driving system, control system and drainage system, can be applied to all coal bed gas and natural gas well, does not receive the restriction of well shape and well condition, except the drainage, can also effectively discharge functions such as shaft bottom sand production and solid powder granule, can effectively ensure that the gas well lasts the product gas.

Description

Automatic drainage gas production device

Technical Field

The utility model belongs to the technical field of oil gas field development, be a technique and method for natural gas and coal bed gas exploitation specifically are a drainage gas production device.

Background

Coal bed gas and natural gas are always important energy sources, compared with coal and oil, the coal bed gas and the natural gas do not pollute the environment and are determined as clean energy sources, along with the fact that people are aware of the threat of global environment deterioration to human survival, the exploitation of the natural gas is paid more and more attention, the application range of the natural gas is wider and wider, the natural gas is not limited to civil use and power generation, the natural gas gradually replaces coal and oil in many fields, and the global demand for the natural gas is greatly increased.

One of the biggest problems preventing the natural gas from being fully exploited is that water is produced from the gas well, which often causes the gas well to be flooded, and the water in the shaft blocks the natural gas in the stratum from flowing into the well, so that the natural gas cannot be exploited to the ground. Since the existence of gas wells, many professionals continuously research various methods for water drainage and gas production, but the various water drainage methods used at present have different defects, and the ideal purpose of thorough water drainage cannot be achieved.

The drainage methods used at present are roughly classified into three main categories: 1) foam drainage, namely putting chemical substances which can react with water or generate foam in water into the well bottom to fill foam into the well bore, so that on one hand, the well bottom pressure can be increased, the purpose of drainage can be achieved, and simultaneously, the foam can carry water, but the drainage degree of the method is very limited, and the purpose of full drainage can not be achieved completely; 2) plunger drainage, which is a method of intermittently draining water by placing a plunger in a well bore and using the energy of a gas well, has two major disadvantages: a) water is drained through the energy of the gas well, and if the gas well is completely flooded, the gas well cannot be used; b) only intermittently discharges water, and the water discharge is limited. 3) The water at the bottom of the well is pumped to the ground by using an electric pump (a piston pump or a submersible pump), but when bubbles exist in the well, firstly, the pump efficiency is influenced, secondly, if the bubbles exist, the electric pump is pumped out, the pump is easy to damage, if sand exists, the sand discharge influences the drainage of the piston pump, and when the piston pump is used, the air lock is often encountered, so that the purpose of drainage cannot be achieved; the sand discharge and the evacuation are easy to cause the submersible pump to be burnt out or damaged, and meanwhile, the working state of the electric pump cannot be monitored, and the damage of the electric pump cannot be known in time. In order to overcome the defects of various drainage methods in the current market, the patent provides a novel drainage and gas production device which is not influenced by bubbles and sand production, can fully and controllably continuously discharge accumulated water at the bottom of a well to the ground, and can effectively discharge solid particles at the bottom of the well to the ground if sand is produced.

SUMMERY OF THE UTILITY MODEL

An automatic drainage gas production device, its range of application is applicable to various well conditions for all-round, does not receive the restriction of conditions such as the shape (extended reach well, inclined shaft and horizontal well) of gas well productivity itself, gas well sanding and oil pipe situation of gas well, the various situations of gas well can not influence the life of device yet, the utility model discloses a solid powder granule such as gas well sand discharge or coal bed gas well row coal ash can also be used to the device.

The device of the utility model is characterized by automatic control, can realize automatic control drainage according to the accumulated water in the well bottom, does not need human intervention, can detect the pressure change of the well mouth of the gas well, and automatically starts drainage according to the accumulated water condition in the well bottom of the gas well; and the drainage function is automatically closed when accumulated water at the bottom of the well is drained to the gas well, so that gas production of the gas well can be continuously and smoothly carried out for a period of time, and the gas production of the gas well is not influenced during drainage.

The utility model discloses a device has adopted and has utilized gas well self resource to provide power for drainage system, need not external power supply, saves the investment of setting up the wiring, building power infrastructure like this promptly, saves power consumptive expense again.

The utility model relates to an automatic drainage gas production device, its technical scheme as follows: the device comprises three major systems of a power system, a control system and a drainage system:

1) the power system consists of a natural gas internal combustion engine 1, a natural gas purifying device 2 and a natural gas storage tank 3. The natural gas internal combustion engine is used for providing power for the drainage system, the power output end of the natural gas internal combustion engine is connected with the ground pump, and the gas inlet pipeline of the natural gas internal combustion engine is connected with the gas outlet of the natural gas storage tank; the natural gas purification equipment is used for purifying produced gas of a gas well and then providing a gas source for the natural gas internal combustion engine, wherein the gas inlet end of the natural gas purification equipment is connected with a wellhead gas production pipeline, and the gas outlet end of the natural gas purification equipment is connected to a natural gas storage tank; the natural gas storage tank is used for storing purified natural gas and supplying gas to the natural gas internal combustion engine to enable the natural gas internal combustion engine to operate, the gas inlet end of the tank is connected to the gas outlet end of the natural gas processing equipment, and the gas outlet end of the tank is connected to the gas inlet of the natural gas internal combustion engine.

2) The control system is composed of a pressure controller 4 and a natural gas internal combustion engine starting controller 5. The pressure controller is arranged at the wellhead of the gas supply pipeline of the natural gas internal combustion engine and used for monitoring the pressure of the wellhead, and the pressure controller is connected with the signal transmission line to the natural gas internal combustion engine starting controller; the natural gas internal combustion engine starting controller is connected with the natural gas internal combustion engine and used for controlling the starting and the closing of the natural gas internal combustion engine.

3) The drainage system consists of a ground pump 6, a power liquid separation storage tank 7, a power liquid delivery pipe 8, a downhole jet pump 9, a downhole packer 10 and a ground manifold 11. The ground pump provides power for the drainage system, the ground pump is driven by the natural gas internal combustion engine, a water inlet pipeline of the ground pump is connected with a power liquid discharge port of the power liquid separation storage tank, and a water outlet pipeline of the ground pump is connected with a power liquid conveying pipe; the power liquid separation storage tank is a storage tank of power liquid of the jet pump and is also a separation device for separating discharged water, trace gas and solid particles in a well, the tank is provided with a liquid inlet and three discharge ports, the liquid inlet is connected to a power liquid conveying pipe and an oil pipe annulus, the liquid outlet at the middle position is connected to a liquid inlet of a ground pump, the liquid outlet at the lower position is used for discharging produced water and solid particles, and the discharge port at the highest position is a gas discharge port; the power liquid conveying pipe is arranged in the oil pipe and used for conveying working liquid for the underground jet pump to enable the jet pump to work, the upper end of the power liquid conveying pipe is connected to an outlet of the ground pump, and the lower end of the power liquid conveying pipe is connected with the underground jet pump; the downhole jet pump is used for sucking the stratum liquid at the lower part of the bottom hole packer into a jet pump cavity and discharging the stratum liquid to a well head through a power liquid conveying pipe and an oil pipe annulus, the upper part of the downhole jet pump is connected with the power liquid conveying pipe, and the lower part of the downhole jet pump is connected with the bottom hole packer; the bottom hole packer is used for sealing the annular space of a bottom hole power fluid pipe and a tubing, providing the working environment of the downhole jet pump, and simultaneously providing a channel for draining accumulated water at the lower part of the packer to the ground, and is arranged at the bottom of the power fluid pipe and the tubing (see figure 1).

Drawings

FIG. 1 is a schematic view of the structure of the device of the present invention

FIG. 2 is a schematic view of the operation of the device of the present invention

FIG. 3 is a schematic diagram of the operation of a downhole jet pump

The labels in the figure are: the method comprises the following steps of 1-a natural gas internal combustion engine, 2-natural gas purification equipment, 3-a natural gas storage tank, 4-a pressure controller, 5-a natural gas internal combustion engine starting controller, 6-a ground pump, 7-a power liquid separation storage tank, 8-a power liquid conveying pipe 9-a downhole jet pump, 10-a bottom hole packer and 11-a ground manifold.

Detailed Description

1 System construction and operating principle

The device mainly comprises three systems: a power system, a control system and a drainage system. The power system provides power for the whole device to discharge the formation water to the ground, the control system is used for automatically controlling the time length and interval of the drainage according to the quantity of accumulated water at the bottom of the well, and the drainage system is used for realizing a channel and a mode for discharging the formation water to the ground. The pressure controller judges to start and close the natural gas internal combustion engine according to the change of the monitored wellhead pressure, the natural gas internal combustion engine drives a ground pump to work after being started, the ground pump conveys power fluid from a power fluid storage separation tank to a pump cavity of a downhole jet pump through a power fluid conveying pipe, the power fluid forms negative pressure in the pump cavity of the downhole jet pump, stratum fluid is sucked into a throat pipe of the downhole jet pump through a channel of a downhole packer, the continuous work of the ground pump discharges mixed fluid of the power fluid and the stratum fluid to a wellhead through an annular space of the power fluid conveying pipe and an oil pipe and finally flows to the power fluid storage separation tank, after the mixed fluid of the stratum fluid and the power fluid is separated in the power fluid storage separation tank, a part of the fluid is conveyed to the downhole jet pump again as the power fluid by the ground pump, and other fluid, impurities and gas are discharged from a discharge port at the topmost and bottommost of the power fluid separation storage tank respectively, thereby achieving the purpose of draining accumulated water at the bottom of the well.

2 working process

(1) When the pressure of the well mouth is reduced to the lowest value of the set pressure of the pressure controller, the pressure controller opens a pipeline switch for supplying gas to the natural gas internal combustion engine, and simultaneously activates a natural gas internal combustion engine starter to enable the natural gas internal combustion engine to start working;

(2) after the natural gas internal combustion engine is started, a ground pump of a drainage system is driven to work, power fluid of the underground jet pump is conveyed to the underground jet pump through a power fluid conveying pipe from a storage tank, and the underground jet pump starts to work;

(3) after the jet pump at the bottom of the well is started, the jet pump forms negative pressure to suck formation fluid at the lower part of a packer at the bottom of the well to a power fluid conveying pipe and an oil pipe annulus (see figure 3) through a pump cavity of the jet pump, and the well bottom fluid is continuously discharged to a well head;

(4) the pressure of the well head rises gradually along with the continuous discharge of accumulated liquid at the well bottom, when the pressure of the well head rises to the highest value of the set value of the pressure controller, the pressure controller closes a valve for supplying gas to the natural gas internal combustion engine, and transmits a signal for stopping the operation of the natural gas internal combustion engine to the natural gas internal combustion engine controller, and the natural gas internal combustion engine stops operating, so that a ground pump of the drainage system stops operating, and the whole drainage system stops operating;

(5) forming a complete drainage working cycle from opening to closing in the steps (1) to (4);

(6) and (4) with the gradual accumulation of liquid at the bottom of the well, continuously reducing the pressure at the wellhead, starting the pressure controller again when the pressure at the wellhead is reduced to the lowest value of the pressure controller, repeating the steps (1) to (4) and finishing a new drainage cycle.

The whole system continuously opens and closes the drainage function according to the pressure change of the well head, realizes automatic opening and closing of drainage according to the accumulated water condition at the well bottom without manual intervention, thereby ensuring that the gas well is not influenced by water outlet at the well bottom and continuously produces gas.

Claims

1. An automatic drainage gas production device is characterized in that: the device consists of three systems, namely a power system, a control system and a drainage system; a pipeline is externally connected to a natural gas purification device (2) and a natural gas storage tank (3) from a gas well gas production pipeline, and finally the natural gas internal combustion engine (1) to form a power supply system of the whole device; a pressure controller (4) is arranged at the annular space of a wellhead oil pipe and a power fluid conveying pipe, and the pressure controller is connected with a signal transmission line to a natural gas internal combustion engine starting controller (5) to form a control system; the drainage system comprises a ground pump (6), a power liquid separation storage tank (7), a power liquid conveying pipe (8), a downhole jet pump (9), a downhole packer (10), a ground manifold (11) and the like, wherein a liquid suction inlet of the ground pump is connected to a liquid output port of the power liquid separation storage tank, the ground pump is connected with a natural gas internal combustion engine and transmits power to the ground pump by the natural gas internal combustion engine, a liquid inlet of the power liquid separation storage tank is connected to an annular output end of a wellhead oil pipe and the power liquid conveying pipe, the power liquid separation tank is provided with three output ports which are respectively connected to a liquid inlet pipeline, a drainage pipeline and an exhaust port of the ground pump, the upper end of the power liquid conveying pipe is connected to a liquid output port of the ground pump, the lower end of the power liquid conveying pipe; the annulus of the power fluid delivery pipe and the oil pipe provides a passage for discharging liquid at the bottom of the well to the ground, and the interior of the power fluid delivery pipe is a passage for delivering the power fluid from a surface pump to the bottom of the well.

2. The automatic water drainage gas production device according to claim 1, characterized in that: the gas production pipeline of the gas well is externally connected with a pipeline which is connected to the natural gas purification equipment (2) and the natural gas storage tank (3) and finally to the natural gas internal combustion engine (1), the gas of the gas well is used as a power source, and the natural gas internal combustion engine is adopted to form self-power supply.

3. The automatic water drainage gas production device according to claim 1, characterized in that: a pressure controller (4) is installed at the annular space of a wellhead oil pipe and a power fluid conveying pipe, the pressure controller is connected with a signal transmission line to a natural gas internal combustion engine starting controller (5), and the pressure controller is used for controlling the starting and stopping of the natural gas internal combustion engine to realize automatic drainage.

4. The automatic water drainage gas production device according to claim 1, characterized in that: the drainage system consists of a ground pump (6), a power liquid separation storage tank (7), a power liquid conveying pipe (8), an underground jet pump (9), a well bottom packer (10) and a ground manifold (11), and the underground jet pump is used for drainage.

5. The automatic water drainage gas production device according to claim 1, characterized in that: the drainage system consists of a ground pump (6), a power liquid separation storage tank (7), a power liquid conveying pipe (8), an underground jet pump (9), a well bottom packer (10) and a ground manifold (11), and the power liquid conveying pipe is adopted to provide working liquid for the underground jet pump.