Method for determining highest yield occurrence time of shale gas well

A determination method and technology for shale gas wells, which are applied in the fields of earth-moving drilling, wellbore/well components, and production fluids, etc., can solve the problem of not being able to optimize the production system in time, and achieve the effect of optimizing the production system.

Active Publication Date: 2020-05-22
PETROCHINA CO LTD
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Problems solved by technology

In related technologies, the maximum production rate and its occurrence time are usually determined after the production curve trend has reversed significantly, which makes the evaluation of gas well productivity and fracturing effect have a certain lag, and thus cannot be optimized in time. production system

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  • Method for determining highest yield occurrence time of shale gas well
  • Method for determining highest yield occurrence time of shale gas well
  • Method for determining highest yield occurrence time of shale gas well

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Embodiment Construction

[0044] In order to make the technical solutions and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. Unless otherwise defined, all technical terms used in the embodiments of the present invention have the same meaning as commonly understood by those skilled in the art.

[0045] Shale gas fracturing is characterized by "large sand volume, large liquid volume, and large displacement". A large amount of fracturing fluid is pumped into the formation, and the fracturing fluid will have a dialysis effect with the shale reservoir, thus making the fracturing fluid mineral The fracturing degree increases gradually, the larger the fracture size, the closer the distance from the wellbore, the shorter the contact time with the reservoir, the lower the salinity of the fracturing flowback fluid, and vice versa, the higher the salinity of the flowback fluid.

[0046] li...

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Abstract

The invention discloses a method for determining the highest yield occurrence time of a shale gas well, and belongs to the technical field of oil and natural gas exploitation. The determination methodcomprises the steps as follows: a flow-back fluid of the shale gas well is obtained regularly, and the mineralization degree of the flow-back fluid is measured; points are drawn on a rectangular plane coordinate system by taking the time for obtaining the flow-back fluid as an abscissa and the mineralization degree as an ordinate; linear fitting is carried out on the tracing points by stages to obtain a plurality of trend lines corresponding to each stage; and the highest yield occurrence time of the shale gas well is determined according to the change of the slopes of the trend lines. According to the determination method provided by the embodiment of the invention, the mineralization degree of the flow-back fluid of the shale gas well is measured regularly, and the highest yield occurrence time of the shale gas well is determined according to the change of the mineralization degree. According to the determination method, the highest yield occurrence time of the gas well can be rapidly determined in the early stage of production, so that the productivity and the fracturing effect of the gas well can be evaluated in time, and the production system is optimized.

Description

technical field [0001] The invention relates to the technical field of oil and natural gas exploitation, in particular to a method for determining the occurrence time of the maximum output of a shale gas well. Background technique [0002] Shale gas is an unconventional oil and gas resource rich in shale reservoirs. The global resource reserves are huge and have broad exploitation potential. However, shale reservoirs are characterized by low porosity and ultra-low permeability. The porosity of shale reservoirs is generally not more than 10%, and the porosity of most shale reservoirs is less than 5%. Mainly, the permeability is mainly Nadarcy and Micro-Darcy. Therefore, under the original formation conditions, natural gas cannot flow from the reservoir to the wellbore, so it has no mining value. [0003] Fracturing technology is the main technical means currently used in the development of shale gas reservoirs. Its purpose is to fully break up the matrix reservoir, form a co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/17E21B43/26
CPCG06F17/17E21B43/26
Inventor 周小金雍锐范宇曾波刘胜军宋毅郭兴午杨柳段希宇周拿云朱仲义陈娟荆晨杨蕾宋雯静岳文翰
Owner PETROCHINA CO LTD
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