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Method for determining injection pressure at natural gas pool-forming period of dense reservoir

A technology for tight reservoirs and injection pressure, which is used in earth-moving drilling, wellbore/well components, etc., to achieve the effects of accurate data, simple and fast testing and experimental methods, and easy to popularize and use on a large scale.

Active Publication Date: 2017-03-15
PETROCHINA CO LTD
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  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the above method has two defects: on the one hand, it is close to ancient times, which is an indirect method; on the other hand, it uses a numerical simulation method, which increases the unreliability of the data

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  • Method for determining injection pressure at natural gas pool-forming period of dense reservoir
  • Method for determining injection pressure at natural gas pool-forming period of dense reservoir
  • Method for determining injection pressure at natural gas pool-forming period of dense reservoir

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Embodiment 1

[0030] This embodiment provides a method for determining the injection pressure of tight gas reservoirs during the gas accumulation period for the Dabei 2 tight gas reservoir in the Kuqa Basin, which includes the following steps:

[0031] It is clear that the source rock of the Dabei 2 tight gas reservoir in the Kuqa Basin is the Triassic-Jurassic lacustrine mudstone and limnic coal-measure strata, and the reservoir is the Cretaceous Bashijiqike Formation K at the top of the source rock. 1 b s , the gas migration direction of the Dabei 2 tight gas reservoir in the Kuqa Basin is from the source rock to the reservoir;

[0032] In the direction of natural gas migration in the Dabei 2 tight gas reservoir in the Kuqa Basin, the adjacent gas layer and water layer are found through the gas reservoir section. The water layer is close to the direction of the source rock. The gas layer is 5658-5669m deep and 11m thick , the water layer at the bottom is 5669-5679m, and the thickness is ...

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Abstract

The invention provides a method for determining injection pressure at a natural gas pool-forming period of a dense reservoir. The method comprises the steps of clearly studying natural gas reservoir forming source rock of the dense reservoir and the reservoir, and regulating that the natural gas migration direction in dense reservoir natural gas reservoir forming is a source rock pointing reservoir; in the natural gas migration direction in the dense reservoir natural gas reservoir forming, determining adjacent air layers and dry layers or air layers and water layers through a natural gas reservoir forming section; obtaining mercury injection threshold pressure of the adjacent air layers and dry layers or air layers and water layers, and obtaining pressure average values thereof; and performing conversion on the dense reservoir natural gas reservoir forming capillary pressure and mercury injection threshold pressure, namely determining injection pressure at the natural gas pool-forming period of the dense reservoir. The method for determining injection pressure at the natural gas pool-forming period of the dense reservoir has data reliability and accuracy.

Description

technical field [0001] The invention relates to a method for determining the injection pressure during the accumulation period of natural gas, in particular to a method for determining the injection pressure during the accumulation period of natural gas in tight reservoirs, and belongs to the technical field of petroleum exploitation. Background technique [0002] At present, tight gas is a hot spot in the study of unconventional oil and gas resources, and it is also an important part of increasing reserves and production of oil and gas resources. The main driving force in the process of tight gas accumulation is not buoyancy, but the injection pressure provided by the source-reservoir pressure difference (Zou Cai, Zhang Guangya, Tao Shizhen, etc., Geological characteristics, major discoveries and unconventional petroleum geology in the global oil and gas exploration field, Petroleum Exploration and Development, 2010, 37(2), 129-143). Injection pressure recovery and researc...

Claims

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Application Information

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IPC IPC(8): E21B49/00
CPCE21B49/008
Inventor 公言杰赵孟军冉启全卓勤功鲁雪松
Owner PETROCHINA CO LTD
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