CN210858707U

CN210858707U - Experimental device for water invades gas reservoir and influences gas production

Info

Publication number: CN210858707U
Application number: CN201922047703.0U
Authority: CN
Inventors: 陈吉祥; 郭肖
Original assignee: Southwest Petroleum University
Current assignee: Southwest Petroleum University
Priority date: 2019-11-25
Filing date: 2019-11-25
Publication date: 2020-06-26
Anticipated expiration: 2029-11-25

Abstract

The utility model discloses an experimental device for the influence of a water-cut gas reservoir on gas production, which relates to the technical field of gas reservoir exploitation and comprises a rock core holder, wherein an inlet of the rock core holder is connected with a gas supply container and a water supply container in parallel, an outlet of the rock core holder is connected with a back pressure valve and a separator in sequence, and an inlet or an outlet of the rock core holder is connected with a standard air chamber for calibrating the gas phase volume of a rock core holder system; an outlet pipeline of the back pressure valve extends into the liquid level of the separator; the bottom of the separator is communicated with the liquid measuring cylinder through a bent pipe; the top of the separator is communicated with the top of a drainage bottle, the bottom of the drainage bottle is communicated with a gas measuring cylinder through a bent pipe, and the core holder is rotationally connected with the support. The utility model discloses simple structure, the rock core holder angle of inclination is adjustable, and the long tube-shape separator that adopts the water storage has realized the cooling to the seepage flow fluid, and the separator liquid level is unchangeable during simultaneous measurement, has eliminated the influence of temperature, liquid level change to the gas of seepage flow, liquid volume measurement in the separator, and the test result is more accurate.

Description

Experimental device for water invades gas reservoir and influences gas production

Technical Field

The utility model relates to a gas reservoir exploitation technical field specifically is an experimental apparatus of gas reservoir to gas production influence is invaded to water.

Background

In the field of oil and gas field development, most gas reservoirs have bottom water, and water invasion often occurs in the gas reservoir development process. If the gas well is only a limited large water body, the invasion of the water body can become displacement energy in gas reservoir development, the pressure of a stratum is effectively supplemented, but the water body is too large, the stratum water rapidly enters the gas layer, the phenomena of water coning, water channeling and the like occur, the water breakthrough of the gas well is caused, the production is influenced, even the water flooding of the gas well is caused, the productivity is rapidly reduced, and the gas well is scrapped too early and the like. Therefore, if the water invasion can be timely and accurately identified in the early development stage of the gas reservoir, the water invasion mode is judged, and the water invasion dynamics of the water-drive gas reservoir is predicted, the development strategy can be timely adjusted, the anhydrous gas production period of the gas reservoir is delayed, and the gas recovery ratio is improved. Therefore, it is very important to carry out the research of water invasion developments and development law to the bottom water gas reservoir, relevant experimental apparatus has a lot at present, but do not consider the seepage flow fluid temperature mostly, the influence to the measurement of vapour and liquid separator liquid level etc. the separator entry is the gas-liquid mixture of high temperature, gas after the separation can cool off gradually, because the temperature is great to the gas volume influence, so gas volume measurement is inaccurate, the mode that adopts manual control valve simultaneously controls the separator liquid level and leads to the liquid level undulant big, this direct influence is gas, the measurement of liquid volume, therefore data error is great.

SUMMERY OF THE UTILITY MODEL

In view of above technical problem, the utility model aims to provide an experimental apparatus of gas reservoir to gas production influence is invaded to water, this device is provided with standard air chamber calibration system volume, and has optimized liquid, gaseous measurement system, and the measured data degree of accuracy is high and use portably.

The utility model adopts the following technical proposal:

an experimental device for influence of a water-invasion gas reservoir on gas production comprises a core holder located in a constant temperature box, wherein the peripheral side face of the core holder is connected with a confining pressure pump, a core is fixed in the core holder, an inlet of the core holder is connected with an air supply container and a water supply container in parallel, an outlet of the core holder is sequentially connected with a back pressure valve and a separator, an inlet and an outlet of the core holder are communicated through a communication line, an inlet or an outlet of the core holder is connected with a standard gas chamber, and the standard gas chamber is used for calibrating the gas volume of a core holder; the separator is a long cylindrical container, water is filled in the separator, an outlet pipeline of the back pressure valve extends into the separator, and an outlet of the back pressure valve is positioned below the liquid level, so that after gas and liquid of fluid seeped out of the rock core are separated, the gas exchanges heat with the water in the separator in the rising process and is rapidly cooled, the temperature of the gas entering a drainage bottle is constant, the liquid is mixed with the water in the separator for cooling, and the temperature of the liquid in the separator is not greatly increased due to the fact that the amount of the gas-liquid mixture seeped out of the rock core in the experimental process is small, and the liquid can be stably maintained after exchanging heat with the environment through the wall of the separator; the bottom of the separator is communicated with the liquid measuring cylinder through the elbow, and the highest point of the elbow is equal to the liquid level in the separator, so that the liquid level in the separator cannot change in the experimental process, and the volume of the liquid seeped out of the rock core is equal to that of the liquid in the liquid measuring cylinder; the top of the separator is communicated with the top of a drainage bottle, water is filled in the drainage bottle, the bottom of the drainage bottle is communicated with a gas measuring cylinder through a bent pipe, and the highest point of the bent pipe is level to the liquid level of the drainage bottle.

Preferably, the standard air chamber is a non-driving end of the piston container, the inner volume of the standard air chamber is known, volume scales are arranged on the outer wall of the standard air chamber, and the hydraulic pump is communicated with the driving end of the piston container and used for displacing air in the piston container.

Preferably, the water supply container is a piston container, and the non-driving end of the water supply container is communicated with the outlet of the constant pressure pump.

Preferably, the outer wall of the core holder is provided with a rotating shaft, and the core holder is rotatably connected with the supporting frame through the rotating shaft, so that the inclination angle of the core holder can be conveniently adjusted.

Compared with the prior art, the beneficial effects of the utility model reside in that:

the utility model discloses simple structure, the rock core holder angle of inclination is adjustable, can simulate different inclination under water and invade the influence to the recovery ratio, the utility model discloses being provided with the gaseous phase volume that standard air chamber can accurate survey rock core holder system, adopting the long tube-shape separator of water storage to realize the cooling to the seepage flow fluid, the separator liquid level is stable during simultaneous measurement, has eliminated the influence of gas temperature change to seepage flow's gas, liquid volume measurement in separator liquid level change and the drain bottle, and the test result is more accurate.

Drawings

FIG. 1 is a schematic flow chart of the whole embodiment;

FIG. 2 is a schematic view of the supporting frame of the present embodiment;

in the figure, 1, a water supply container; 2. a gas supply container; 3. a core holder; 4. a back pressure valve; 5. a separator; 6. a liquid measuring cylinder; 7. draining bottles; 8. a gas measuring cylinder; 9. a pressure gauge; 10. a standard air chamber; 11. A support frame; 12. a discharge line;

101. a constant pressure pump; 31. a core; 32. a confining pressure pump; 33. a rotating shaft; 1001. a hydraulic pump; 1101. a support pillar; 1102. a backing plate.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that the embodiments or technical features described below can be arbitrarily combined to form a new embodiment without conflict.

Example (b):

an experimental device for influence of a water-invasion gas reservoir on gas production is shown in figure 1 and comprises a water supply container 1, a rock core holder 3, a back pressure valve 4 and a separator 5 which are sequentially connected, wherein the water supply container 1 is connected with a gas supply container 2 in parallel, the outlet of the water supply container is communicated, the water supply container 1 is a piston container, a displacement fluid is filled in the non-driving end of the water supply container, the non-driving end of the water supply container is communicated with the outlet of a constant pressure pump 101, and the constant pressure pump 101 is used for pressurizing the displacement fluid; a rock core 31 is fixed in the rock core holder 3, and the peripheral side surface of the rock core holder 3 is connected with a confining pressure pump 32 for applying confining pressure to the rock core 31; pressure gauges 9 are arranged at the inlet and the outlet of the core holder 3 and used for measuring experiment pressure and pressure difference between two ends of a core 31; the inlet and outlet of the core holder 3 are communicated through a communication line, a needle valve is arranged on the communication line, the inlet of the core holder 3 is also connected with a standard air chamber 10 for calibrating the air volume of the core holder system, the standard air chamber 10 is a non-driving end of a piston container, volume scales are arranged on the non-driving end, and the non-driving end of the piston container is connected with a hydraulic pump 1001; the core holder 3 and the standard air chamber 10 are both positioned in a constant temperature box and used for simulating the formation temperature condition; the separator 5 is a long cylindrical container, water is filled in the long cylindrical container, an outlet pipeline of the back pressure valve 4 extends below the liquid level of the separator 5, so that gas seeped out of the core 31 exchanges heat with the water in the separator 5 in the rising process and is rapidly cooled, liquid seeped out of the separator is mixed with the water for cooling, and the total amount of a gas-liquid mixture seeped out of the core 31 in the experimental process is small, so that the temperature of the liquid in the separator is not greatly increased, and the liquid can be stably maintained after exchanging heat with the environment through the wall of the separator; the bottom of the separator 5 is communicated with the liquid measuring cylinder 6 through an elbow, and the highest point of the elbow is equal to the liquid level in the separator 5, so that the liquid level in the separator 5 cannot change in the experimental process, and the volume of the liquid seeped out of the rock core 31 is equal to that of the liquid in the liquid measuring cylinder 6; the top of the separator 5 is communicated with the top of a drainage bottle 7, water is filled in the drainage bottle 7, the bottom of the drainage bottle 7 is communicated with a gas measuring cylinder 8 through a bent pipe, and the highest point of the bent pipe is level to the liquid level of the drainage bottle. The outlet of the back pressure valve 4 is also provided with a discharge pipeline 12, and a hand valve is arranged on the pipeline, so that the gas discharge in the experiment replacement process is facilitated.

As shown in fig. 2, the device is further provided with a support frame 11, the support frame 11 comprises two parallel support columns 1101 and a backing plate 1102, and one end of each support column 1101 is fixedly connected with the backing plate 1102; two rotating shafts 33 are symmetrically arranged in the middle of the outer wall of the peripheral side of the core holder 3, and the core holder 3 is positioned between the two support columns 1101 and is rotatably connected with the support columns 1101 through the rotating shafts 33, so that the inclination angle of the core holder 3 can be conveniently adjusted.

The device comprises the following steps:

(1) the core 31 is loaded into the core holder 3 and the confining pressure is set by using the confining pressure pump 32, the displacement fluid is added into the water supply container 1, the water is added into the separator 5 and the drainage bottle 7, and the device is connected.

(2) The core holder system is gas tight and displaced with the gas from the gas supply vessel 2, during which the gas is discharged through the gas discharge line 12, and then the valve on the gas discharge line 12 is closed and the core is saturated with the gas from the gas supply vessel at the experimental pressure.

(3) Calibrating the gas volume of the core holder system: and opening a needle valve on a communication line of an inlet and an outlet of the core holder 3, changing the volume of a standard air chamber after isolating a core holder system, and calculating the total gas phase volume of the system through the pressure change of the core holder system, thereby calculating the total gas volume quantity at the initial stage of the experiment by combining temperature and pressure.

(4) Closing the needle valve on the communication line of the core holder 3, closing the outlet valve of the air supply container 2, opening the outlet valve of the water supply container 1, starting the constant pressure pump 101, displacing with the displacement fluid, and testing the gas yield.

The inclination angle of the rock core holder 3 can be adjusted in the experimental process, and the influence on water invasion under different inclination angles is simulated.

Various other modifications and changes may be made by those skilled in the art based on the above-described technical solutions and concepts, and all such modifications and changes are intended to fall within the scope of the claims.

Claims

1. An experimental device for influence of a water-invasion gas reservoir on gas production comprises a core holder positioned in a constant temperature box, wherein the peripheral side surface of the core holder is connected with a confining pressure pump, a core is fixed in the core holder, an inlet of the core holder is connected with an air supply container and a water supply container in parallel, and an outlet of the core holder is sequentially connected with a back pressure valve and a separator; the separator is a long cylindrical container, water is filled in the separator, and an outlet pipeline of the back pressure valve extends into the liquid level of the separator; the bottom of the separator is communicated with the liquid measuring cylinder through a bent pipe, and the highest point of the bent pipe is level to the liquid level in the separator; the top of the separator is communicated with the top of a drainage bottle, water is filled in the drainage bottle, the bottom of the drainage bottle is communicated with a gas measuring cylinder through a bent pipe, and the highest point of the bent pipe is level to the liquid level of the drainage bottle.

2. The experimental device for the influence of a water cut gas reservoir on gas production as claimed in claim 1, wherein the standard gas chamber is a non-driving end of the piston container, volume scales are marked on the non-driving end, and the driving end of the piston container is communicated with the hydraulic pump.

3. The experimental device for testing the influence of a water invasion gas reservoir on gas production according to claim 2, wherein the water supply container is a piston container, and a non-driving end of the water supply container is communicated with an outlet of the constant pressure pump.

4. An experimental device for testing influence of a water-invasion gas reservoir on gas production according to any one of claims 1 to 3, wherein a rotating shaft is arranged on the outer wall of the core holder, and the core holder is rotatably connected with the support frame through the rotating shaft.