WO2020124661A1

WO2020124661A1 - Evaluation device for hydrate-containing reservoir damage and evaluation method

Info

Publication number: WO2020124661A1
Application number: PCT/CN2018/124260
Authority: WO
Inventors: 卢静生; 李栋梁; 梁德青; 何勇
Original assignee: 中国科学院广州能源研究所
Priority date: 2018-12-19
Filing date: 2018-12-27
Publication date: 2020-06-25
Also published as: AU2018454108A1; CN109594982A

Abstract

An evaluation device for hydrate-containing reservoir damage, comprising: a sample synthesis chamber (10), used for synthesizing a hydrate-containing reservoir; a stress-strain system, used for providing overlying stress and pore pressure to the sample synthesis chamber and measuring the pressure and strain of the reservoir; a temperature system, used for performing temperature control on the sample synthesis chamber and measuring the temperature of the reservoir; a gas-liquid-solid separation system, used for performing gas-liquid or gas-liquid-solid separation on the output of the sample synthesis chamber and measuring the output; a data acquisition and monitoring system, used for acquiring real-time data and performing real-time image acquisition on the gas-liquid-solid separation system. The device can synthesize a specific hydrate sample under overlying stress, and monitor the temperature, pressure and strain during the synthesis process; a sensitivity test can be performed on a specific hydrate-containing sample, and the sensitivity thereof and damage of a working fluid to the reservoir can be evaluated.

Description

Evaluation device and evaluation method of hydrate reservoir damage

Technical field

The invention relates to the technical field of natural gas hydrate exploration and development, in particular to an evaluation device and an evaluation method for damage of a hydrate reservoir.

Background technique

Natural gas hydrates are ice-like solids formed by gas and water under high-pressure and low-temperature conditions. They are widely distributed in deep-sea sediments or frozen soil on land. The reserves are very huge, which is twice the total carbon of conventional global fuels. However, hydrate reservoirs have complex structures, low permeability, complex mineral composition, and complex temperature and pressure. Therefore, it is necessary to evaluate the key factors and extent of damage to hydrate reservoirs during the exploration and development process.

The prior art does not have the ability to synthesize hydrates, it cannot test the damage of the reservoir under the condition of hydrate, nor does it have a detailed evaluation of the hydrate reservoir.

Reservoir damage assessment is the foundation of reservoir protection technology and a very important part of the system engineering of reservoir protection technology. However, the current evaluation methods are no longer suitable for the needs of hydrate reservoir development, and the formation of a method for rapid evaluation of hydrate reservoir damage is of great significance for the entire process of hydrate reservoir protection and economic development.

Summary of the invention

The object of the present invention is to overcome the above-mentioned shortcomings of the prior art, and to provide an evaluation device and evaluation method for hydrate reservoir damage.

The present invention is achieved by the following technical solution: An evaluation device for hydrate reservoir damage, including:

Sample synthesis room, used to synthesize hydrate reservoir;

A stress-strain system, connected to the sample synthesis chamber through a pipeline, is used to provide overlying stress and pore pressure to the sample synthesis chamber, and measure the pressure and strain of the reservoir;

A temperature system, arranged in the sample synthesis chamber, used for temperature control of the sample synthesis chamber and measuring the temperature of the reservoir;

The gas-liquid-solid separation system is connected to the sample synthesis chamber through a pipeline, and is used to perform gas-liquid or gas-liquid-solid separation on the output of the sample synthesis chamber and measure the output;

A data collection and monitoring system is in communication with the sample synthesis chamber, the stress-strain system, the temperature system, and the gas-liquid-solid separation system, and is used to collect the stress-strain system, temperature system, and gas-liquid-solid separation. Real-time data of the system, and real-time image acquisition of the gas-liquid-solid separation system.

The sample synthesis chamber includes a three-dimensional temperature measurement module, a three-dimensional pressure measurement module, and a synthesis chamber kettle lid for covering the sample synthesis chamber; a water jacket for temperature control is provided outside the sample synthesis chamber; The stress-strain system includes an overlying stress module, a gas booster module, a liquid booster module, a gas-liquid booster pump, a strain measurement module, a gas source, and a buffer tank; the overlying stress module is movably disposed in the synthesis chamber kettle Cover and move to increase or decrease the sample synthesis chamber, and the strain measurement module collects the movement of the overlying stress module; the gas source passes through the gas pressurization module and the buffer tank Connected to the sample synthesis chamber; the liquid booster module, gas-liquid booster pump, and strain measurement module are connected to the sample synthesis chamber through pipelines; the temperature system includes a water bath module and a transfer tube, and the water bath module passes The transfer tube is connected to the sample synthesis chamber and the buffer tank respectively; the gas-liquid-solid separation system includes a gas-liquid-solid separation tank, an electronic scale and a gas flow meter, and the gas flow meter passes through the gas-liquid solid The separation tank is connected to the outlet of the sample synthesis chamber; the data collection and monitoring system includes a collection instrument, a computer processor and a high-definition camera, the temperature, pressure, strain of the collection device of the collection instrument, and the electronic scale and gas flow Calculated real-time data and transmit the data to the computer processor, and the high-definition camera performs real-time image acquisition on the gas-liquid-solid separation tank and transmits the acquired information to the computer processor.

The gas-liquid-solid separation tank is a gas-liquid-solid separation tank with a visual structure. The visually set gas-liquid-solid separation tank can visually observe the internal change process.

The method for evaluating reservoir damage based on an evaluation device for hydrate reservoir damage includes the following steps:

Step 1: The sample synthesis chamber controls the temperature and pressure of sample synthesis through a stress-strain system and a temperature system, synthesizes samples with different overlying stress loads, different pore pressures, and different temperatures to simulate the occurrence of real hydrates;

Step 2: Carry out the sensitivity test of different fluid components at different temperatures and different pressures to simulate the sensitivity test of the hydrate mining process under real conditions;

Step 3: Collect the temperature, pressure, strain, working quality and flow data during sample synthesis and testing through the acquisition instrument, and observe the gas-liquid or gas-liquid-solid separation in the gas-liquid-solid separation tank through a high-definition camera;

Step 4: Sensitivity analysis, through the data collected by the acquisition instrument, comprehensively analyze the changes of stress, strain and temperature of the fluid after passing through the hydrate sample under different conditions, and analyze the changes of permeability and porosity through the computer processor. The sensitivity is evaluated, including speed sensitivity, water sensitivity, salt sensitivity, alkali sensitivity, acid sensitivity, stress sensitivity, temperature sensitivity, and the degree of damage of the working fluid to the hydrate reservoir.

Compared with the prior art, the present invention has the advantage that the device can realize the synthesis of a specific hydrate sample under the condition of overlying stress, and monitor the temperature, pressure and strain during the synthesis process; Sensitivity test and evaluation of its sensitivity and working fluid damage to the reservoir.

BRIEF DESCRIPTION

FIG. 1 is a structural block diagram of an embodiment of the present invention;

FIG. 2 is a working flowchart of an embodiment of the present invention.

The meanings of the reference signs in the figure: 1. water pump; 2. advection pump; 3. manual pump; 4. constant speed and constant pressure pump; 5. vacuum pump; 6. gas booster pump; 7. buffer tank; 8. gas source; 9. Low temperature water bath; 10. Sample synthesis chamber; 11. Synthetic chamber kettle cover; 12. Movable overlying stress loading system; 13. Electric valve; 14. Gas flow meter; 15. Gas-liquid-solid separation tank; 16. HD Camera; V1-V14, the first valve-the fourteenth valve; P1-P7, the first pressure sensor-the seventh sensor; p1-p7, the first pressure sensor-the seventh sensor to test the injection pressure; T, Temperature sensor group; S, strain sensor.

detailed description

The content of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Examples

Referring to FIGS. 1 and 2, it is a device for evaluating damage of hydrate reservoirs, including:

Sample synthesis chamber 10, used to synthesize hydrate reservoir;

The stress-strain system is connected to the sample synthesis chamber 10 through a pipeline to provide the sample synthesis chamber 10 with overlying stress and pore pressure, and to measure the pressure and strain of the reservoir;

The temperature system is connected to the water jacket of the sample synthesis chamber 10 through a pipeline to control the temperature of the sample synthesis chamber 10. The temperature sensor group T of the three-dimensional temperature measurement module is required to measure the temperature of the sample synthesis chamber 10;

The gas-liquid-solid separation system is connected to the sample synthesis chamber 10 through a pipeline, and is used to perform gas-liquid or gas-liquid-solid separation on the output of the sample synthesis chamber 10 and measure the output;

The data acquisition and monitoring system is in communication with the sample synthesis chamber 10, stress and strain system, temperature system, and gas-liquid-solid separation system. It is used to collect real-time data of the stress-strain system, temperature system, and gas-liquid-solid separation system. Solid separation system for real-time image acquisition.

The sample synthesis chamber 10 includes a three-dimensional temperature measurement module, a three-dimensional pressure measurement module, and a synthesis chamber kettle lid 11 for covering the sample synthesis chamber 10; a water jacket for temperature control is provided outside the sample synthesis chamber 10; the stress-strain system includes Overlay stress module, gas booster module, liquid booster module, gas-liquid booster pump, strain measurement module (strain sensor S), gas source 8 and buffer tank 7; overlay stress module can be movably set on the lid of the synthesis chamber 11 and increase or decompress the sample synthesis chamber 10 by movement, and measure the movement of the overlying stress module through the strain sensor S; the gas source 8 is connected to the sample synthesis chamber 10 through the gas pressurization module and the buffer tank 7; The liquid booster module, gas-liquid booster pump, and strain measurement module are connected to the sample synthesis chamber 10 through pipelines; the temperature system includes a water bath module and a transfer tube, and the water bath module is connected to the sample synthesis chamber 10 and the buffer tank 7 through the transfer tube; The liquid-solid separation system includes a gas-liquid-solid separation tank 15, an electronic scale, and a gas flowmeter 14. The gas flowmeter 14 is connected to the outlet of the sample synthesis chamber 10 through the gas-liquid-solid separation tank 15; the data collection and monitoring system includes a collection instrument, The computer processor and high-definition camera 16 collect the temperature, pressure, strain of the device and the real-time data of the electronic scale and the gas flowmeter 14 and transmit the data to the computer processor. The high-definition camera 16 performs the gas-liquid-solid separation tank 15 Real-time image acquisition and transmission of acquisition information to the computer processor.

The gas-liquid-solid separation tank 15 is a gas-liquid-solid separation tank 15 with a visual structure. The visually set gas-liquid-solid separation tank 15 can visually observe the internal change process.

Step 1: The sample synthesis chamber 10 controls and measures the temperature and pressure of sample synthesis through a stress-strain system and a temperature system, synthesizes samples with different overlying stress loads, different pore pressures, and different temperatures to simulate the occurrence of real hydrates ;

Step 3: Collect the temperature, pressure, strain, working quality and flow data during the sample synthesis and testing process by the collector, and use the high-definition camera 16 to separate the gas-liquid or gas-liquid-solid in the gas-liquid-solid separation tank 15 Observation

In this embodiment, the three-dimensional temperature measurement module uses a temperature sensor group T, and the three-dimensional pressure measurement module uses a first pressure sensor P1 (test injection pressure p1), a second pressure sensor P2 (test injection pressure p2), and a third pressure sensor P3 (test injection pressure p3), fourth pressure sensor P4 (test injection pressure p4), fifth pressure sensor P5 (test injection pressure p5), sixth pressure sensor P6 (test injection pressure p6), seventh Pressure sensor P7 (test injection pressure p7); the pipeline is connected to each part through a valve, the valve includes a first valve V1, a second valve V2, a third valve V3, a fourth valve V4, a fifth valve V5, sixth Valve V6, seventh valve V7, eighth valve V8, ninth valve V9, tenth valve V10, eleventh valve V11, twelfth valve V12, thirteenth valve V13, and fourteenth valve V14. In the stress-strain system, the overlying stress module is a movable overlying stress loading system 12, the gas booster module uses a gas booster pump 6; the liquid booster module uses a water pump 1, a parallel flow pump 2, a manual pump 3, and a vacuum pump 5; The liquid booster pump uses a constant speed and constant pressure pump 4; the strain measurement module uses a strain gauge; the water bath module uses a low temperature water bath 9. The pressure p1 to the pressure p7 are the pressure indications of the pressure sensor table, and are not shown in the figure.

In the method for evaluating reservoir damage, the different fluid components refer to gas, liquid and gas-liquid mixed fluids; the evaluation method involves the following main measurement parameters:

(1) Temperature: real-time measurement using temperature sensor.

(2) Stress: real-time measurement using pressure sensor.

(3) Strain: The strain gauge is mainly used for measurement.

(4) Fluid quality: real-time measurement through electronic scale.

(5) Fluid flow rate: real-time test by mass flow meter.

(6) Permeability: The data measured by the three-dimensional pressure sensor is calculated by Darcy's formula, that is, calculated according to the test pressure change before and after the sample chamber.

(7) Porosity: The data measured by the strain sensor S is calculated by software, that is, when the amount of sand in the reservoir is constant, the generated strain all comes from the change of porosity.

The process of this embodiment is as follows:

1) Sample synthesis:

Add a sample of aqueous deposits to the sample synthesis chamber 10, close the kettle lid 11 of the synthesis chamber, seal with O-rings and bolts, connect the strain sensor S, close all valves; open the fourteenth valve V14 and vacuum with the vacuum pump 5, at the same time The seventh valve V7 is opened to pressurize the movable overlying stress loading system 12, providing the overlying stress to compact the reservoir and maintain it. Then, the vacuum pump 5 and the fourteenth valve V14 are turned off, and the gas source 8 passes through the buffer tank 7 through the constant pressure and constant speed pump, and is injected into the sample synthesis chamber 10 through the fourth valve V4, the fifth valve V5, the sixth valve V6, and the eighth valve V8 valve. After closing the fourth valve V4, start the low-temperature water bath 9 to flow into the water jacket of the sample synthesis chamber 10 for temperature control to synthesize hydrates in the sediment; or to dry the sediment in the sediment by fluid injection with a fixed amount of water and a fixed amount of fluid Synthesize hydrate deposits by cooling; the separated liquid flows from the twelfth valve V12 to the liquid outlet.

2) Sensitivity test:

After the hydrate sample is synthesized, the advection pump 2 or the gas booster pump 6 is injected into the sample chamber by the constant speed and pressure pump 4 through the buffer tank 7 (the first pressure sensor P1 tests the injection pressure p1), and the outlet is Four pressure sensors P4 measure the outlet pressure p4, the third pressure sensor P3 and the seventh pressure sensor P7 are distributed to test the sample up and down pressures p3 and p7 in real time, and the permeability of the sample chamber is calculated in real time in the software of the computer processor according to the Darcy formula. The strain sensor S can calculate the porosity change of the sample chamber in real time in the software according to the strain data of the sample and the volume of the sample synthesis chamber 10. It can measure the sensitivity of fluids with different flow rates, fluids with different water contents, fluids with different salt components, fluids with different pH values, fluids with different temperatures, and different effective pressures, and test the degree of damage to the reservoir by different working fluids.

3) Sensitivity evaluation:

According to the measured data and calculation of the experiment, combined with the changes of permeability and porosity, the sensitivity of the reservoir to fluid intrusion is analyzed, mainly including speed sensitivity, water sensitivity, salt sensitivity, acid sensitivity, alkali sensitivity, stress sensitivity, temperature sensitivity Evaluation and the degree of damage to the reservoir by various working fluids.

The above detailed descriptions are specific descriptions of possible embodiments of the present invention. The embodiments are not intended to limit the patent scope of the present invention. Any equivalent implementation or change without departing from the present invention should be included in the patent scope of the case in.

Claims

An evaluation device for hydrate reservoir damage, characterized in that it includes:

Sample synthesis room, used to synthesize hydrate reservoir;

A stress-strain system, connected to the sample synthesis chamber through a pipeline, is used to provide overlying stress and pore pressure to the sample synthesis chamber, and measure the pressure and strain of the reservoir;

A temperature system, arranged in the sample synthesis chamber, used for temperature control of the sample synthesis chamber and measuring the temperature of the reservoir;

The gas-liquid-solid separation system is connected to the sample synthesis chamber through a pipeline, and is used to perform gas-liquid or gas-liquid-solid separation on the output of the sample synthesis chamber and measure the output;

A data collection and monitoring system is in communication with the sample synthesis chamber, the stress-strain system, the temperature system, and the gas-liquid-solid separation system, and is used to collect the stress-strain system, temperature system, and gas-liquid-solid separation. Real-time data of the system, and real-time image acquisition of the gas-liquid-solid separation system.
The hydrate reservoir damage evaluation device according to claim 1, wherein the sample synthesis chamber includes a three-dimensional temperature measurement module, a three-dimensional pressure measurement module, and a synthesis chamber for covering the sample synthesis chamber Kettle cover; a water jacket for temperature control is provided outside the sample synthesis chamber; the stress-strain system includes an overlying stress module, a gas booster module, a liquid booster module, a gas-liquid booster pump, a strain measurement module, Air source and buffer tank; the overlying stress module can be movably arranged on the lid of the synthesis chamber and the movement of the sample synthesis chamber can be increased or decompressed by movement, and the strain measurement module can overlie the overlying stress module The gas source is connected to the sample synthesis chamber through the gas booster module and the buffer tank; the liquid booster module, gas-liquid booster pump, and strain measurement module are connected to the The sample synthesis chamber is connected; the temperature system includes a water bath module and a transfer tube, and the water bath module is connected to the sample synthesis chamber and the buffer tank through the transfer tube; the gas-liquid-solid separation system includes gas-liquid-solid Separation tank, electronic scale and gas flow meter, the gas flow meter is connected to the outlet of the sample synthesis chamber through the gas-liquid-solid separation tank; the data acquisition and monitoring system includes an acquisition instrument, a computer processor and high-definition A camera, the temperature, pressure, strain, and real-time data of the electronic scale and gas flow meter are collected by the collector and transmitted to the computer processor, and the high-definition camera performs real-time data on the gas-liquid-solid separation tank Image acquisition and transmission of the acquisition information to the computer processor.
The hydrate reservoir damage evaluation device according to claim 2, wherein the gas-liquid-solid separation tank is a gas-liquid-solid separation tank with a visual structure.
The method for evaluating reservoir damage according to the hydrate reservoir damage evaluation device according to claim 2, characterized in that it includes the following steps:

Step 1: The sample synthesis chamber controls the temperature and pressure of sample synthesis through a stress-strain system and a temperature system, synthesizes samples with different overlying stress loads, different pore pressures, and different temperatures to simulate the occurrence of real hydrates;

Step 2: Carry out the sensitivity test of different fluid components at different temperatures and different pressures to simulate the sensitivity test of the hydrate mining process under real conditions;

Step 3: Collect the temperature, pressure, strain, working quality and flow data during sample synthesis and testing through the acquisition instrument, and observe the gas-liquid or gas-liquid-solid separation in the gas-liquid-solid separation tank through a high-definition camera;

Step 4: Sensitivity analysis, through the data collected by the acquisition instrument, comprehensively analyze the changes of stress, strain and temperature of the fluid after passing through the hydrate sample under different conditions, and analyze the changes of permeability and porosity through the computer processor. The sensitivity is evaluated, including speed sensitivity, water sensitivity, salt sensitivity, alkali sensitivity, acid sensitivity, stress sensitivity, temperature sensitivity, and the degree of damage of the working fluid to the hydrate reservoir.