Productivity calculation method with tight gas reservoir percolation mechanism taken into consideration

A productivity calculation and tight gas technology, which is applied in the field of productivity calculation considering the seepage mechanism of tight gas reservoirs, and can solve the problems of complex gas seepage mechanism in tight and low permeability gas reservoirs.

Inactive Publication Date: 2017-03-29
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0003] The gas seepage mechanism in tight low-permeability gas reservoirs is relatively complex, and t...

Method used

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  • Productivity calculation method with tight gas reservoir percolation mechanism taken into consideration
  • Productivity calculation method with tight gas reservoir percolation mechanism taken into consideration
  • Productivity calculation method with tight gas reservoir percolation mechanism taken into consideration

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Embodiment Construction

[0094] In order to make the above and other objects, features and advantages of the present invention more comprehensible, the preferred embodiments are listed below and shown in the accompanying drawings in detail as follows.

[0095] like figure 1 as shown, figure 1 It is a flow chart of the production calculation method considering the seepage mechanism of tight gas reservoirs in the present invention.

[0096] In step 101, a gas percolation motion equation considering the start-up pressure gradient is established. The equation is:

[0097]

[0098] In the formula, v is the seepage velocity, cm / s; K is the permeability, μm 2 ; μ is fluid viscosity, mPa·s; p is pressure, 0.1MPa; λ is starting pressure gradient, constant, 0.1MPa / cm.

[0099] Formula (1) can be transformed into formula (2):

[0100]

[0101] The process goes to step 102.

[0102] In step 102, a gas percolation motion equation considering the pressure-sensitive effect is established. The equati...

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Abstract

The invention provides a productivity calculation method with the tight gas reservoir percolation mechanism taken into consideration. The method comprises the steps of 1, establishing a gas percolation motion equation with the starting pressure gradient taken into consideration; 2, establishing a gas percolation motion equation with the pressure-sensitivity effect taken into consideration; 3, establishing a percolation with the pressure-sensitivity effect and the starting pressure gradient taken into consideration; 4, describing percolation, in a gas reservoir, of fluid through the percolation equation established in step 3, and establishing a vertical shaft steady state productivity equation; and 5, describing percolation, in a stratum, of gas through the percolation equation established in step 1 according to formed infinite flow-guiding vertical cracks, and establishing a fracturing vertical shaft steady state productivity equation. By means of the productivity calculation method with the tight gas reservoir percolation mechanism taken into consideration, theoretical productivity of a gas well can be determined in the tight gas reservoir development process; production allocation of the gas well can be instructed; influence of the starting pressure gradient and the pressure-sensitivity effect on productivity can be determined quantitatively; and a great significance is achieved for studying the tight low-percolation gas reservoir.

Description

technical field [0001] The invention relates to the technical field of oilfield development, in particular to a productivity calculation method considering the seepage mechanism of tight gas reservoirs. Background technique [0002] Tight gas is a kind of clean energy, and tight low-permeability gas reservoirs have a permeability less than 0.1×10 -3 μm 2 (except fracture permeability). The deep tight sandy conglomerate gas reservoirs in Shengli Oilfield have poor physical properties, are ultra-low porosity and low permeability reservoirs, and have low natural productivity. Accelerating the development of tight and low-permeability gas reservoirs will not only greatly reduce my country's external energy dependence, but also promote the adjustment of my country's energy structure. [0003] The gas seepage mechanism in tight low-permeability gas reservoirs is relatively complex, and the classical seepage law in the traditional sense is no longer applicable to low-permeabilit...

Claims

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Application Information

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IPC IPC(8): E21B49/00E21B43/26
Inventor 徐耀东田同辉谷建伟张强陈恺王爱景常涧峰郭敏靳利超吴满李钰
Owner CHINA PETROLEUM & CHEM CORP
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