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Method for determining in-situ gas volume recovery of marine shale, device thereof and system

A shale and in-situ technology, applied in the field of devices and systems, and in-situ gas volume recovery determination methods for marine shale, can solve problems such as existing errors, large errors, and doubts about the accuracy of porosity and gas saturation, etc. To achieve the effect of enriching scientific significance, avoiding uncertainty, and good industrial value

Active Publication Date: 2021-11-19
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the problem with this method is that the measured porosity is often related to the test time, and there are often errors. The logging interpretation method is often used in sandstone formations with high porosity, and its logging evaluation effect has been generally recognized and applied. However, the accuracy of porosity and gas saturation calculated from logging data in tight shale formations has been questioned, and the empirical formulas used in logging interpretation for porosity and water saturation may not be Suitable for use in shale reservoirs
Therefore, the overall error of the method will be relatively large

Method used

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  • Method for determining in-situ gas volume recovery of marine shale, device thereof and system
  • Method for determining in-situ gas volume recovery of marine shale, device thereof and system
  • Method for determining in-situ gas volume recovery of marine shale, device thereof and system

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Experimental program
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Embodiment approach

[0081] According to one embodiment of the present invention, the detailed process of in-situ total gas content measurement of marine shale is as follows:

[0082] 1. Prepare the column sample and dry it; 2. Put it into the core holder and vacuumize; 3. Inject the gas of the corresponding pressure into the reference cylinder; 4. Adjust the temperature and pressure conditions of the core holder and the back pressure valve to the actual formation 5. Open the valve and inject gas into the core from the reference cylinder; 6. Balance the pressure at both ends of the core holder to the corresponding value by controlling the stop valve and pressure regulating valve; 7. Read the cumulative flow rate of the gas metering device at the tail end; 8. Calculate the total gas content of shale according to the principle of material conservation.

[0083] Wherein, the formula for calculating the total gas content of shale samples in this invention is:

[0084] V=V 注 -V 管 -V 尾

[0085] V ...

Embodiment

[0096] Using the above as image 3 The device system shown in the figure measures the gas content of shale, and uses the shale in-situ adsorption gas measurement device to measure the adsorption gas capacity, the details are as follows:

[0097] 1. Take a shale sample from Longmaxi Formation in Well W1, and establish a geological model according to the in-situ geological conditions of the sample: the formation temperature is 120°C, the formation pressure is 87.5MPa, and the fluid pressure is 60MPa;

[0098] 2. Prepare a standard column sample of 2.5cm*5cm, wire cut, grind both ends, and dry at 105°C for 24 hours for the total gas content test;

[0099] 3. Put the column sample into the core holder 201, and vacuumize the shale in-situ gas content testing device for 1 hour;

[0100] 4. Inject 100MPa of high-purity methane into the reference cylinder 104;

[0101] 5. Set the temperature and pressure conditions of the core holder 201 as: 120°C and 87.5MPa, and set the pressure o...

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Abstract

The invention relates to a method for determining in-situ gas volume recovery of marine shale, a device thereof and a system. The device comprises a gas injection device, a rock core clamping device and a tail end gas metering device, the gas injection device, the rock core clamping device and the tail end gas metering device are sequentially connected in a sealed mode, and the gas injection device is configured to provide injection gas for the rock core clamping device; the rock core clamping device is configured to clamp a rock sample of the marine shale and set and adjust temperature and pressure; and the tail end gas metering device is configured to be capable of setting the outlet pressure of the rock core clamping device at a certain numerical value and collecting and metering gas flowing out of the rock core clamping device.

Description

technical field [0001] The invention relates to the technical field of petroleum exploration, in particular to a method, device and system for determining in-situ gas recovery of marine shale. Background technique [0002] Shale gas refers to the relatively high-purity methane gas that exists in the pores and fractures inside shale, and is an important unconventional oil and gas resource that can achieve carbon neutrality and carbon peaking. Since the success of the shale oil and gas revolution in the United States, China has also made significant progress in the exploration and development of shale gas in the past ten years. A large number of industrial gas flow wells have been drilled in the Longmaxi Formation marine shale formation in the Sichuan Basin. [0003] The main occurrence states of shale gas are adsorbed gas, free gas and dissolved gas. In marine shale, the main occurrence states of shale gas are adsorbed gas and free gas, and dissolved gas can be ignored. [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N7/00
CPCG01N7/00
Inventor 万成祥宋岩姜振学李卓罗群郝绵柱苏展飞周城汉红兰
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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