Water drainage and gas production simulated experimental device

Abstract

The invention provides a water drainage and gas production simulated experimental device, which is used for simulating the water drainage and gas production of coal bed gas wells or other water producing gas wells. The water drainage and gas production simulated experimental device consists of a speed reducer, a water pump, a wellhead device, a water storage device, a detection device, a casing string, a water pipe column, a drainage and mining roofbolt and a drainage and mining pump, wherein the drainage and mining roofbolt, the water pipe column and the casing string form two annular spaces; a water jacket performs deflation in the annular space while the rod and the pipe perform drainage in the annular space; physical distribution in the annular space of the water jacket realizes the study of the separation condition of two-phase flow gases; the speed reducer integrates a power machine and a transmission system and realizes the large transmission ratio and the continuous adjustmentof stroke frequency and arbitrary adjustment of which the liquor drainage volume is between 3 and 30m<3> / d and the submergence depth is between 0 and 20 meters; the detection device realizes the real-time monitoring of the liquor drainage volume, a movable liquid level, the pressure, well liquor components and the stress of rod pieces; a walking beam counterweight adopts a split structure, and the position of a crank counterweight can be adjusted continuously, so that the good balance of the water pump is realized; and a structure of a single crank, a single connecting rod and a sliding bearing is adopted to reduce the size of a complete machine.

Description

technical field [0001] The invention relates to a simulation device for drainage and gas recovery of a coalbed gas well or other water-producing gas wells, which is suitable for a rod drainage and recovery process system. Background technique [0002] At present, the existing simulation experiment device is a rod-mounted device composed of a power machine, a pumping unit, an oil pipe, a sucker rod, and an oil pump, and is used for lifting the liquid in an oil well. Inject a certain amount of liquid in the air, start the power unit, and convert the rotary motion of the power machine into the up and down reciprocating motion of the suspension point through the pumping unit, so as to approximate the downhole conditions in oil well production, and complete the well fluid flow rate, solid particle settlement and rod Testing and analysis of stress situations. However, these simulation devices do not provide another annular space composed of tubing and casing, and cannot simulate ...

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Problems solved by technology

However, these simulation devices do not provide another annular space composed of tubing and casing, and cannot simulate the drainage of the annulus of the rod and tubing, and the drainage of gas from the annulus of the oil casing, so they are not suitable for the experimental simulation of water-producing gas wells; moreover, Only a certain amount of liquid can be injected into the rod-pipe annulus, but the actual well’s rod-pipe annulus is filled with well fluid, and there is also a certain submerged liquid in the outer casing annulus, and the height of the submerged degree changes with the progress of drainage. At the same time, the rod string and pipe string are usually only 1-3m, which cannot complete the simulation of the change of the dynamic liquid level and the submergence height; in addition, the stroke times of the pumping unit are fixed and cannot be adjusted continuously, and the displacement in actual production The liquid volume is constantly changing, and stepless speed regulation needs to be realized to meet the liquid discharge requirements

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