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Method for calculating gas drainage radius by considering seepage mechanism of tight gas reservoir

A calculation method and tight gas technology, applied in calculation, fluid extraction, earthwork drilling and production, etc., can solve problems such as insufficient deflation radius, slow pressure propagation, well shutdown recovery time affecting the deflation radius, etc.

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

The deflation radius of a gas well is mainly represented by the detection radius of well test interpretation. However, in tight gas reservoirs, the pressure conductivity coefficient is small, the pressure propagation is slow, and the length of well shut-in recovery time will affect the determination of the deflation radius.

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  • Method for calculating gas drainage radius by considering seepage mechanism of tight gas reservoir
  • Method for calculating gas drainage radius by considering seepage mechanism of tight gas reservoir
  • Method for calculating gas drainage radius by considering seepage mechanism of tight gas reservoir

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Embodiment Construction

[0033] 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.

[0034] Such as figure 1 as shown, figure 1 It is a flow chart of the method for calculating the leak radius considering the seepage mechanism of tight gas reservoirs in the present invention.

[0035] In step 101, determine the pressure-sensitive coefficients of rock samples with different initial permeability through physical simulation experiments, and then fit a graph of the relational curve between initial permeability and pressure-sensitive coefficient, so that it can be determined by the initial permeability of rock samples near the well pressure sensitivity coefficient.

[0036] In step 102, through physical simulation experiments, experiments are carried out with rock cores of different water saturations, and the relationship between differen...

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Abstract

The invention provides a method for calculating a gas drainage radius by considering a seepage mechanism of a tight gas reservoir. The method for calculating the gas drainage radius by considering the seepage mechanism of the tight gas reservoir comprises the steps of 1, fitting a relation curve chart of initial permeability and a pressure-sensitive coefficient through a physical simulation experiment; 2, obtaining a relationship between effective permeability and a starting pressure gradient through the physical simulation experiment; 3, determining the pressure-sensitive coefficient and the starting pressure gradient through the chart; 4, calculating the gas drainage radius by considering the starting gradient; and 5, calculating the gas drainage radius by considering a pressure-sensitive effect and the starting gradient. According to the method for calculating the gas drainage radius by considering the seepage mechanism of the tight gas reservoir, external dependency of Chinese energy is greatly reduced; Chinese energy structure adjustment is promoted; and the method has an important support effect for stable production of natural gas.

Description

technical field [0001] The invention relates to the technical field of oilfield development, in particular to a method for calculating the leaking radius considering the seepage mechanism of tight gas reservoirs. Background technique [0002] 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. The venting radius of gas wells is mainly represented by the detection radius of well test interpretation. However, tight gas reservoirs have small pressure conductivity and slow pressure propagation. For this reason, we invented a new calculation method of leaking radius considering the seepage mechanism of tight gas reservoirs, which solved the above technical problems. Contents of the invention [0003] The purpose of the present invention is to provide a calculation method of leaking radius considering the seepage mechanism of tight gas reser...

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Application Information

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IPC IPC(8): G06F17/50E21B43/00
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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