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Evaluation model and evaluation method for improving mobility of shale oil through gas injection, and application

An evaluation model and evaluation method technology, which is applied in the preparation of test samples, analysis by nuclear magnetic resonance, sampling, etc., can solve the problems of poor convincing evaluation results, etc., and achieve clear experimental ideas, broad application prospects, and reproducibility high effect

Active Publication Date: 2021-03-16
CHINA UNIV OF PETROLEUM (EAST CHINA) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the embodiments of the present invention is to provide an evaluation model for improving the mobility of shale oil by gas injection, so as to solve the problem that most of the existing evaluation methods based on gas injection to improve the mobility of shale oil proposed in the background technology use numerical simulation. method, there are problems such as poor convincing evaluation results

Method used

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  • Evaluation model and evaluation method for improving mobility of shale oil through gas injection, and application
  • Evaluation model and evaluation method for improving mobility of shale oil through gas injection, and application
  • Evaluation model and evaluation method for improving mobility of shale oil through gas injection, and application

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Embodiment 1

[0090] An evaluation model for improving the mobility of shale oil by gas injection, which is shown in the following formula (1):

[0091]

[0092] Among them, formula (1) is used to calculate the movable ratio of shale oil (the ratio of movable reserves of crude oil to the total content of crude oil);

[0093] In formula (1), η tX Indicates the movable ratio of shale oil in the shale rock sample at time x (during the gas injection displacement process); wherein, the shale rock sample is the original core sample of the shale or mud shale to be evaluated Carry out cutting, remove residual oil in the pores and dry to obtain dry shale samples, and then conduct nuclear magnetic resonance tests on the dry shale samples to obtain the corresponding NMR T 2 Signal volume, then evacuate and pressurize the saturated oil, and age it for 25-30 days, then take out the aged saturated oil sample, and carry out the nuclear magnetic resonance test on the aged saturated oil sample, and obta...

Embodiment 2

[0096] The establishment method of the evaluation model for improving the mobility of shale oil by gas injection in Example 1 is specifically referred to figure 1 shown, which includes:

[0097] The obtained original mud shale samples were sequentially cut, oil washed, dried at low temperature, saturated oil (n-dodecane) and aged, and then put into the nuclear magnetic resonance-displacement device, using different gas media (nitrogen, carbon dioxide, , methane, air, etc.) to displace the crude oil in the pore throats. By designing different experimental schemes, it is possible to simulate the process of soaking and opening wells under the condition of gas injection in the mine. In the experiment, NMR hydrogen signals (T 2 Spectrum), which can monitor the content and distribution characteristics of crude oil in sample pore throats at different times in real time, and then evaluate the change of movable oil ratio in shale under different gas injection conditions. The experim...

Embodiment 3

[0099] Such as figure 1 As shown, the embodiment of the present invention discloses a method for evaluating gas injection to improve the mobility of shale oil by using a nuclear magnetic resonance device. This method realizes the evaluation of the mobility effect of gas injection in shale oil by means of the nuclear magnetic resonance device. After oil washing, low-temperature drying, and saturated oil, the samples were subjected to gas injection displacement, and the simmering and well opening process during the gas injection process were simulated, and the NMR signal characteristics of samples in different experimental stages were compared. After the experiment is over, the data is processed and analyzed to obtain the content and distribution characteristics of crude oil in samples at different stages, and to evaluate the movable ratio of shale oil under gas injection conditions.

[0100] Specifically, the original core samples of shale or mud shale to be evaluated are sequ...

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Abstract

The invention relates to the technical field of petroleum development, and particularly discloses an evaluation model and an evaluation method for improving mobility of shale oil through gas injection, and an application. The evaluation model for improving the mobility of the shale oil through gas injection is based on a fact that nuclear magnetic signals of samples can be measured in real time bymeans of a nuclear magnetic resonance instrument in a gas injection displacement experiment, and nuclear magnetic resonance detection can be performed on the samples in different states in an experiment process. Distribution characteristics of crude oil in the samples at different stages are obtained through analysis according to the change characteristics of a nuclear magnetic spectrum so that the mobility of shale oil under a gas injection condition is evaluated, and a problem that most of existing evaluation methods for improving the mobility of shale oil based on gas injection adopt numerical simulation methods and are poor in persuasion is solved. The evaluation method provided by the invention is high in operability, can analyze the mobility change of crude oil with different pore diameters under the shale oil gas injection condition, provides guidance opinions for later mine field tests, is high in reproducibility, and has practical significance for effective development of theshale oil.

Description

technical field [0001] The invention relates to the technical field of petroleum development, in particular to an evaluation model, evaluation method and application for gas injection to improve the mobility of shale oil. Background technique [0002] With the continuous development of science and technology, people's demand for energy is also increasing. Among them, shale oil is a kind of oil resources contained in shale formations, and its resources are huge. Therefore, the exploration and development of shale oil is considered to be an important strategic measure to solve the shortage of oil and gas resources. Although my country's shale oil resources are huge, they all face the same two problems in the development process: the life cycle of the oil well is short (usually less than 10 years), and the recovery rate is extremely low (3%-10%). Due to the small pore size of shale, complex pore-throat structure and high organic matter content, coupled with low formation press...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N24/08G01N1/28G01N1/34
CPCG01N24/081G01N1/28G01N1/286G01N1/34G01N2001/2873
Inventor 王民李明张金旭卢双舫李进步许承武胡慧婷李婷婷
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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