CN210977448U

CN210977448U - Visual experimental apparatus for liquid carrying capacity of parallel double oil pipes

Info

Publication number: CN210977448U
Application number: CN201922052999.5U
Authority: CN
Inventors: 杨志; 陈勇; 康露; 李苗苗
Original assignee: Southwest Petroleum University
Current assignee: Southwest Petroleum University
Priority date: 2019-11-25
Filing date: 2019-11-25
Publication date: 2020-07-10
Anticipated expiration: 2029-11-25

Abstract

The utility model relates to a visual experimental apparatus of parallel two oil pipe liquid carrying capacity, including gas injection system, water injection system, circulating water use system, test system and visual pipe-line system. Compressed air enters the lower end of the gas-liquid mixer through the gas injection nipple, water enters the upper end of the gas-liquid mixer through the water injection nipple, the compressed air and the water are fully mixed, and formed uniform small liquid drops enter a visual parallel double-oil-pipe and single-oil-pipe pipeline system. The flow state of liquid drops in a shaft is shot by a high-speed camera, and the difference of liquid carrying capacity of a parallel double-oil-pipe combined model and a single-oil-pipe model under different temperatures, pressures and flows is researched by analyzing the numerical change of a pressure sensor, a temperature sensor and a flowmeter in a gas injection system, a water injection system and a pipeline system. And the fluid flowing out of the top end of the single oil pipe model and the fluid flowing out of the parallel double-oil pipe combined model after being converged by the outlet end of the pipeline are subjected to gas-liquid separation by the gas-liquid separator, the gas is directly discharged, and the liquid flows back to the water tank for recycling.

Description

Visual experimental apparatus for liquid carrying capacity of parallel double oil pipes

Technical Field

The utility model relates to an oil gas field development exploitation technical field, concretely relates to visual experimental apparatus of liquid ability is taken to parallel two oil pipes.

Background

Along with the deepening of gas reservoir exploitation, the vertical well produces hydrops, and the gas production rate declines day by day. During the flowing process of a multiphase flow of a shaft, the problem of liquid accumulation at the bottom of the shaft becomes a prominent problem influencing the normal production of a gas well. Liquid accumulation in the pipe has many hazards, including liquid accumulation at the bottom of the shaft, gas flow rate reduction, liquid retention rate increase per unit shaft length, gas slip loss and gas-liquid friction loss increase, and single well productivity is seriously affected. The accumulated liquid at the bottom of the well is removed in time, and the energy of the stratum is utilized to carry out liquid carrying production, so that the method is one of effective methods for exploiting the gas well. Therefore, how to accurately predict the critical liquid carrying flow rate of the gas well and calculating the critical liquid carrying flow rate of the gas well have important significance for improving the recovery ratio.

The small oil pipe drainage gas production process is suitable for intermittent jet wells and stop jet wells which have certain energy in the middle and later stages of water-gas reservoirs, and the wells are changed into continuous and stable self-jet wells by using small-pipe-diameter oil pipes or by using a jet-assistant measure. The influence of the pipe diameter on the liquid carrying capacity of the gas well is the main basis of the combination of the double oil pipe columns.

For the difference of verifying gaseous liquid ability of taking of parallel two oil pipe combination model and single oil pipe model under different temperature, pressure and flow, the utility model provides a visual experimental apparatus of liquid ability is taken to parallel two oil pipes.

Disclosure of Invention

The utility model aims at providing a visual experimental apparatus of liquid ability is taken to parallel two oil pipes, this experimental apparatus can study the difference of the liquid ability is taken to gas under parallel two oil pipe combination model of combination and the different temperatures of single oil pipe model, pressure and flow.

The utility model adopts the technical proposal that:

a visual experimental apparatus of liquid carrying capacity of parallel double oil pipes comprises a gas injection system, a water injection system, a circulating water using system, a testing system and a visual pipeline system, and is characterized in that the gas injection system consists of an air compressor, a gas storage tank, a gas injection short joint, a gas flowmeter, an inlet gate valve a, an emptying valve, an inlet gate valve b and a gas path one-way valve; the water injection system consists of a water tank, a centrifugal pump, a water injection short joint, a liquid flowmeter, an inlet gate valve c and a waterway one-way valve; the pipeline system consists of a gas-liquid mixer, a single oil pipe model, a parallel double-oil pipe combined model, an inlet gate valve d and an inlet gate valve e; the testing system consists of a temperature sensor a, a temperature sensor b, a temperature sensor c, a temperature sensor d, a pressure sensor a, a pressure sensor b, a pressure sensor c, a high-speed camera a and a high-speed camera b; the circulating water using system is composed of a gas-liquid separator, an outlet gate valve a, an outlet gate valve b, an outlet gate valve c and a water tank. During the experiment, air compressor carries compressed air in the gas holder, the gas holder has guaranteed stable air feed, open the valve of admitting air, gas passes through gas injection nipple joint injection gas-liquid mixer lower extreme, and injected water gets into the water injection nipple joint through the centrifugal pump and gets into from gas-liquid mixer upper end again, the gas-liquid intensive mixing this moment, the continuous liquid analog process of carrying of device has been realized, the droplet is under the impetus of air current, continuous upward movement, form different mobile patterns through parallel two oil pipe, the liquid droplet is taken the well head after by the air current, through pressure sensor and temperature sensor, in time transmit measured data to the computer, and real-time recording. And the fluid flowing out of the top end of the single oil pipe model and the fluid flowing out of the parallel double-oil pipe combined model after being converged by the outlet end of the pipeline are subjected to gas-liquid separation by the gas-liquid separator, the gas is directly discharged, and the liquid flows back to the water tank for recycling.

The parallel double-oil-pipe combined model and the single-oil-pipe model are both transparent pipes. The visual experimental apparatus is convenient for observe and shoot the experiment phenomenon, can observe the liquid drop and carry to the liquid drop and fall back and form the liquid stream, form the liquid motion overall process of liquid stream to pit shaft hydrops. Two oil pipes with different diameters are arranged in the parallel double-oil-pipe combined model in parallel, and the equivalent diameter of the oil pipes is the same as that of the single-oil-pipe model.

Drawings

Fig. 1 is the flow diagram of the utility model discloses a visual experimental apparatus of parallel two oil pipe liquid carrying capacity.

In the figure, 1, an outlet gate valve a, 2, an outlet gate valve b, 3, a pressure sensor a, 4, a parallel double-oil-pipe model, 5, a high-speed camera a, 6, a temperature sensor a, 7, a temperature sensor b, 8, a single-oil-pipe model, 9, a pressure sensor b, 10, a high-speed camera b, 11, a temperature sensor c, 12, an inlet gate valve d, 13, an inlet gate valve e, 14, a temperature sensor d, 15, a pressure sensor c, 16, a gas-liquid separator, 17, an outlet gate valve c, 18, a water tank, 19, a centrifugal pump, 20, an inlet gate valve c, 21, a liquid flowmeter, 22, a waterway one-way valve, 23, a water injection short section, 24, a gas-liquid mixer, 25, a gas injection short section, 26, a gas storage tank, 27, an inlet gate valve a, 28, an air release valve, 29, an air compressor, 30, an inlet gate valve b, 31.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings.

The utility model provides a visual experimental apparatus of liquid ability is taken to parallel two oil pipes, this experimental apparatus include gas injection system, water injection system, circulating water use system, test system and visual pipe-line system. The air compressor compresses air and then conveys the air storage tank, stable air supply in the experimental process is guaranteed, the air enters the lower end of the gas-liquid mixer through the air injection nipple, and measurement is carried out through the gas flowmeter. Water enters the upper end of the gas-liquid mixer from the water tank through the centrifugal pump and the water injection short joint, and the water amount is measured through the liquid flowmeter. The experimental device simulates the critical liquid carrying capacity difference of a single oil pipe model and a parallel double oil pipe combined model of a water producing gas well under different conditions (different temperatures, pressures, gas production rates and water production rates), and in the experimental process, a high-speed camera a and a high-speed camera b observe the flowing forms of liquid drops in the parallel double oil pipe combined model and the single oil pipe model.

The utility model discloses the experimental procedure and the operating procedure of device as follows:

(1) all valves in the experimental process are closed, enough water is injected into the water tank, the valve of the gas injection system is opened, and the air compressor is opened to enable compressed air to enter the pipeline system from the lower end of the gas-liquid mixer. And opening the centrifugal pump to enable water in the water tank to enter the pipeline system from the upper end of the gas-liquid mixer through the water injection short joint. The amount of water is regulated by an inlet gate valve c and measured by a liquid flow meter, and the gas flow is measured by a gas flow meter.

(2) Compressed air and water are fully mixed by the gas-liquid mixer to generate uniform small liquid drops, and the outlet gate valve b, the outlet gate valve c and the inlet gate valve e are opened, so that the single oil pipe model, the water injection system and the gas injection system form a loop. The flow state of the fluid at the single oil pipe section is shot and observed by a high-speed camera b through adjusting and changing the size (air inflow) of the inlet gate valve b, the numerical values of a temperature sensor c, a temperature sensor d, a pressure sensor b and a pressure sensor c when the flow state is a critical liquid carrying state are recorded, and the recording is repeated for 3-4 times. And (3) carrying out gas-liquid separation on the fluid flowing out of the top end of the single oil pipe model through a gas-liquid separator, directly emptying the gas, and refluxing the liquid to the water tank for recycling.

(3) And (3) closing the inlet valve e and the outlet gate valve b, and opening the inlet gate valve d and the outlet gate valve a to enable the parallel double-oil-pipe combined model, the water injection system and the gas injection system to form a loop. The flow state of the fluid at the pipe section of the parallel double oil pipes is shot and observed by a high-speed camera a through adjusting and changing the size of the inlet gate valve b (the amount of air inflow) and the size of the inlet gate valve c (the amount of water inflow), the numerical values of the temperature sensor a, the temperature sensor b, the temperature sensor d, the pressure sensor a and the pressure sensor c are recorded, and the recording is repeated for 3-4 times. And the fluid which flows out after being converged by the outlet end of the pipeline in the parallel double-oil pipe combined model is subjected to gas-liquid separation by a gas-liquid separator, the gas is directly discharged, and the liquid flows back to the water tank for recycling.

(4) And (3) repeatedly carrying out the operation processes in the steps (2) and (3) by changing the temperature and the pressure of the gas injection system and the water injection system, so that the liquid carrying capacity of the parallel double-oil-pipe combined model and the single-oil-pipe model under different temperature, pressure and flow conditions is researched.

Claims

1. A visual experimental device for liquid carrying capacity of parallel double oil pipes comprises a gas injection system, a water injection system, a circulating water using system, a testing system and a visual pipeline system, and is characterized in that the gas injection system consists of an air compressor (29), a gas storage tank (26), a gas injection short joint (25), a gas flowmeter (31), an inlet gate valve a (27), an emptying valve (28), an inlet gate valve b (30) and a gas path one-way valve (32); the water injection system consists of a water tank (18), a centrifugal pump (19), a water injection short joint (23), a liquid flowmeter (21), an inlet gate valve c (20) and a waterway one-way valve (22); the pipeline system consists of a gas-liquid mixer (24), a single oil pipe model (8), a parallel double oil pipe combined model (4), an inlet gate valve d (12) and an inlet gate valve e (13); the testing system consists of a temperature sensor a (6), a temperature sensor b (7), a temperature sensor c (11), a temperature sensor d (14), a pressure sensor a (3), a pressure sensor b (9), a pressure sensor c (15), a high-speed camera a (5) and a high-speed camera b (10); the circulating water using system consists of a gas-liquid separator (16), an outlet gate valve a (1), an outlet gate valve b (2), an outlet gate valve c (17) and a water tank (18); and the fluid flowing out of the top end of the single oil pipe model (8) and the fluid flowing out of the parallel double oil pipe combined model (4) after being converged through the outlet end of the pipeline are subjected to gas-liquid separation through the gas-liquid separator (16), the gas is directly discharged, and the liquid flows back to the water tank (18) for recycling.

2. The visualization experiment device for the liquid carrying capacity of the parallel double oil pipes according to claim 1, wherein the parallel double oil pipe combination model (4) and the single oil pipe model (8) are both transparent pipes.

3. The visualization experiment device for the liquid carrying capacity of the parallel double oil pipes according to claim 1, characterized in that two oil pipes with different diameters are arranged in parallel in the parallel double oil pipe combined model (4), and the equivalent diameter of the oil pipes is the same as that of the single oil pipe model.