CN210141116U

CN210141116U - Physical experiment device is invaded to gas reservoir water

Info

Publication number: CN210141116U
Application number: CN201922104669.6U
Authority: CN
Inventors: 周旻昊; 乐平; 周程; 张梨
Original assignee: Southwest Petroleum University
Current assignee: Southwest Petroleum University
Priority date: 2019-11-29
Filing date: 2019-11-29
Publication date: 2020-03-13
Anticipated expiration: 2029-11-29

Abstract

The utility model discloses a gas reservoir water invades physical experiment device belongs to oil gas field development physical simulation technical field, including injection system, the model holder of sand pack, back pressure valve, the metering device that connect gradually, be provided with the model of sand pack in the model holder of sand pack, a plurality of vertical wells and probe have been inserted in the model of sand pack, the injection system is including constant speed constant pressure pump and the piston container that connect gradually, piston container and the model of sand pack are located the thermostated container, each piston container export all is provided with the trip valve, the trip valve is located outside the thermostated container, the utility model discloses the trip valve with the piston container export is placed outside the thermostated container, the operation of being convenient for; the gas reservoir water invasion monitoring system is provided with a plurality of vertical wells and a probe for measuring resistance, can simulate gas distribution under various gas production conditions when a gas reservoir water invades, particularly under the condition of a plurality of gas production points, obtains residual gas distribution and total recovery ratio of the gas reservoir water invasion monitoring system, and has positive significance for evaluation of a gas reservoir development mode.

Description

Physical experiment device is invaded to gas reservoir water

Technical Field

The utility model relates to an oil gas field development physical simulation technical field, concretely relates to physical experiment device is invaded to gas reservoir water.

Background

In the field of current oil and gas field development, a physical simulation method is one of main means for indoor research on reservoir displacement mechanism and evaluation on development measure effect. For a simulation experiment device for gas reservoir water invasion, a plurality of core holders are available, most of the core holders are one-dimensional, the recovery efficiency can be evaluated, the distribution of residual gas in a core cannot be measured, the obtained evaluation parameters cannot meet the requirement for evaluating the exploitation mode, and a sand-packed model can well solve the problem, for example, Chinese application patent CN201620829451.0 provides a physical simulation experiment device for gas reservoir water invasion, the device adopts a sand-packed model, the saturation of fluid at different points in a pore medium model can be obtained by testing the resistance of different areas through electrodes, the quantitative distribution rule of the saturation of gas and liquid in the pore medium model is obtained, and the device at least has the following problems:

(1) the outlet valves of the gas supply container and the liquid supply container are both positioned in the thermostat, the temperature in the thermostat is high, the operation is very complicated when the valves are switched in the experimental process, the thermostat needs to be opened, the valves are switched after protective measures are taken, and at the moment, large heat is dissipated from the door of the thermostat, and the temperature must be raised after the door of the thermostat is closed.

(2) The device adopts single-well injection and extraction, only can simulate single-well extraction conditions, in actual development, multiple modes such as single-well extraction, double-well extraction and multi-well extraction exist, and in order to improve the gas recovery rate, a plurality of extraction wells are usually arranged, so that the evaluation of multi-well extraction is important, but the device cannot simulate multiple extraction conditions.

Disclosure of Invention

An object of the utility model is to provide a physical experiment device is invaded to gas reservoir water in order to solve the problem that proposes in the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme:

a physical experiment device for gas reservoir water invasion comprises an injection system, a sand filling model holder, a back pressure valve and a metering device which are connected in sequence, wherein a sand filling model is arranged in the sand filling model holder, a plurality of groups of probes are arranged in the sand filling model holder and used for measuring resistivity, one end of each probe penetrates through the bottom of the sand filling model holder and is connected with a data acquisition system through a wire, the injection system comprises constant-speed constant-pressure pumps and piston containers which are connected in sequence, the injection system is connected in parallel, two groups of the injection systems are respectively filled with injection gas and formation water, outlets of the two piston containers are communicated through a three-way pipe, and the piston containers, the three-way pipe and the sand filling model holder are all positioned in a constant temperature box and used for simulating the formation temperature; the sand-packed model is internally provided with a plurality of vertical wells, one end of each vertical well penetrates through the upper cover of the core holder, the three-way pipe and the back pressure valve are connected with the sand-packed model through different vertical wells, and one or more vertical wells can be selected as extraction wells according to needs in practical use; the piston container is connected with the three-way pipe through a temperature-resistant pipeline, one section of the temperature-resistant pipeline penetrates through the wall of the thermostat and is in sealed connection with the thermostat, and a cut-off valve is arranged on the section of the temperature-resistant pipeline, which is positioned outside the thermostat.

Preferably, the metering device comprises a separator, a measuring cylinder and a gas meter, wherein an inlet of the separator is communicated with an outlet of the back pressure valve, the bottom of the separator is communicated with the measuring cylinder, the measuring cylinder is used for measuring the liquid output, the top of the separator is communicated with the gas meter, and the gas meter is used for metering the volume of the output gas.

Preferably, the bottom of the separator is communicated with the measuring cylinder through an elbow, and the highest point of the elbow is level with the liquid level in the separator, so that the liquid level of the separator is stable in the experimental process, and the measurement of the volume of produced gas and liquid by the fluctuation of the liquid level of the separator is avoided.

Preferably, the temperature-resistant pipeline is movably connected with the three-way pipe and the piston container, and equipment such as the sand-filled model holder is taken out of the thermostat after the temperature-resistant pipeline is convenient to disassemble.

Preferably, the sand filling model is rectangular, and the vertical well is provided with five openings which are respectively positioned at the four corners and the center of the sand filling model.

Compared with the prior art, the beneficial effects of the utility model are that: the utility model arranges the cut-off valve at the outlet of the piston container outside the thermostat, which is convenient for operation; the gas distribution under the condition that water invades the gas reservoir and various gas production conditions, especially the condition of a plurality of gas production points, can be simulated by the probe provided with a plurality of vertical wells and the measuring resistor, the residual gas distribution and the total recovery ratio of the gas reservoir are obtained, and the gas reservoir testing device has positive significance for the development and evaluation of the gas reservoir.

Drawings

Fig. 1 is a schematic structural view of the present invention;

FIG. 2 is a probe profile;

FIG. 3 is a schematic illustration of a sand pack model;

in the figure, 1, a constant pressure constant speed pump; 2. a piston reservoir; 3. a shut-off valve; 4. a three-way pipe; 5. a sand-packed model holder; 6. a back pressure valve; 7. a separator; 8. a measuring cylinder; 9. a gas meter; 10. a data acquisition system; 11. a thermostat; 12. a temperature resistant pipeline; 13. a differential pressure sensor;

51. filling a sand model; 511. a probe; 512. a vertical well.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it should be understood that the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

A gas reservoir water invasion physical experiment device is shown in figure 1 and comprises an injection system, a sand filling model holder 5, a back pressure valve 6 and a separator 7 which are sequentially connected, wherein a sand filling model 51 is arranged in the sand filling model holder 5, 36 groups of probes 511 are inserted into the bottom of the sand filling model 51 and used for measuring resistivity, one end of each probe 511 penetrates through the bottom 5 of the sand filling model holder and is respectively connected with a data acquisition system 10 through an electric wire, and the distribution of each probe is shown in figure 2; as shown in fig. 3, the sand filling model position 51 is rectangular, five vertical wells 512 are arranged at the upper part of the sand filling model position, the vertical wells 512 are respectively arranged at the four corners and the center of the rectangular sand filling model 51, one end of each vertical well 512 is inserted into the sand filling model 51, a plurality of small holes are formed in the insertion section for fluid circulation, and one end of the other end of each vertical well 512 penetrates through the upper cover of the sand filling model clamp 5 and is in sealing connection with the upper cover; as shown in fig. 1, the injection system comprises a constant-pressure constant-speed pump 1 and piston containers 2 which are connected in sequence, the device is provided with two sets of injection systems in parallel, the two sets of injection systems are respectively used for injecting gas and formation water, the outlets of the non-driving ends of the two piston containers 2 are communicated at a three-way pipe 4 through a temperature-resistant pipeline 12, the two piston containers 2, a sand-filled model holder 5 and the three-way pipe 4 are all positioned in a constant temperature box 11 and used for simulating the formation temperature, the temperature-resistant pipeline 12 is provided with a cut-off valve 3, the cut-off valve 3 is positioned outside the constant temperature box 11, and the temperature-resistant pipeline 12 penetrates through the wall of the constant temperature box 11 and is connected with the constant; the outlet of the three-way pipe 4 and the inlet of the back-pressure valve 6 are respectively connected with different vertical wells 512 for simulating different injection and production conditions, for example, when the outlet of the three-way pipe 4 is communicated with the vertical well 512 positioned in the center of the sand-packed model 51, and the other four vertical wells 512 are communicated with the inlets of the back-pressure valve 6, the condition of one injection and four production can be simulated; a pressure sensor is arranged on an inlet pipeline of the back-pressure valve 6 and used for detecting the rock core displacement pressure, and a differential pressure sensor 13 is arranged at an inlet and an outlet of the sand-packed model 51 and used for monitoring the displacement differential pressure; before the experiment, a certain amount of water is added into the separator 7, the bottom of the separator 7 is communicated with the measuring cylinder 8 through a bent pipe, and the highest point of the bent pipe is level with the liquid level in the separator 7, so that the liquid level of the separator 7 is stable and unchanged in the whole experiment process, and the measuring cylinder 8 can accurately measure the volume of the produced liquid; the top of the separator 7 is in communication with a gasometer 9, which gasometer 9 is used to measure the volume of produced gas.

Further, the temperature-resistant pipeline 12 is in threaded connection with the piston container 2 and the three-way pipe 4, and equipment such as the sand filling model holder 5 can be taken out of the thermostat after being conveniently detached.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A gas reservoir water invasion physical experiment device comprises an injection system, a sand-packed model holder, a back pressure valve and a metering device which are connected in sequence, wherein a sand-packed model is arranged in the sand-packed model holder, a plurality of groups of probes are arranged in the sand-packed model, used for measuring resistivity, one end of each probe penetrates through the bottom of the sand filling model holder and is respectively connected with a data acquisition system through an electric wire, the injection system comprises a constant-speed constant-pressure pump and two groups of piston containers which are connected in sequence, the outlets of the two piston containers are communicated through a three-way pipe, the piston containers, the three-way pipe and the sand-packed model holder are all positioned in a constant temperature box, the sand-filling model is characterized in that a plurality of vertical wells are arranged in the sand-filling model, one end of each vertical well penetrates through an upper cover of the core holder, and the three-way pipe and the back pressure valve are connected with the sand-filling model through different vertical wells; the piston container is connected with the three-way pipe through a temperature-resistant pipeline, one section of the temperature-resistant pipeline penetrates through the wall of the thermostat and is in sealed connection with the thermostat, and a cut-off valve is arranged on the section of the temperature-resistant pipeline, which is positioned outside the thermostat.

2. The gas reservoir water invasion physical experiment device of claim 1, wherein two ends of the temperature resistant pipeline are movably connected with a three-way pipe and a piston container.

3. The gas reservoir water invasion physical experiment device according to claim 1, wherein the metering device comprises a separator, a measuring cylinder and a gas meter, an inlet of the separator is communicated with an outlet of the back pressure valve, the bottom of the separator is communicated with the measuring cylinder, and the top of the separator is communicated with the gas meter.

4. The physical experimental device for water invasion of gas reservoir according to claim 3, wherein the bottom of said separator is connected to the measuring cylinder through an elbow, the water is contained in the separator and the highest point of the elbow is equal to the liquid level in the separator.

5. The gas reservoir water invasion physical experiment device of claim 4, wherein the sand-packed model is rectangular, and the vertical wells have five openings which are respectively positioned at four corners and the center of the sand-packed model.