Ultrahigh-pressure tight fractured sandstone gas reservoir sand production prediction method

Abstract

The invention belongs to the technical field of oil and gas exploitation, and discloses an ultrahigh-pressure tight fractured sandstone gas reservoir sand production prediction method. The method mainly considers the influence of the factors such as reservoir strong tectonic stress, perforation hole blockage, an additional pressure difference, and reservoir fractures of a sand production gas reservoir, and mainly comprises the following steps of (1) acquiring rock mechanical parameters through a well logging curve or experiment; (2) determining the magnitude and directions of a vertical main stress, a horizontal maximum main stress and a horizontal minimum main stress through logging data, and establishing a ground stress model; (3) determining an approximate number of effective holes andthe additional pressure difference; and (4) calculating a sand production critical production pressure difference according to the characteristic factors such as the fractures and the additional pressure difference. According to the method, reference and guidance can be provided for sand prevention work in such gas reservoir development, thus facilitating the recovery of normal and stable production of a gas well, and improving the economic benefit.

Description

technical field [0001] The invention belongs to the technical field of oil and gas exploitation, and in particular relates to a method for predicting sand production of ultra-high pressure tight fractured sandstone gas reservoirs. [0002] technical background [0003] With the continuous development of the oil and natural gas industry and the increasing demand for natural gas in China, ultra-high pressure fractured tight sandstone gas reservoirs have become one of the important areas for unconventional natural gas exploration and development because of their huge reserves and high production capacity. With the large-scale exploitation of such gas reservoirs, some gas wells have produced a large amount of sand, which is rare in tight sandstone gas reservoirs. [0004] Sand production is one of the important problems faced in the production process of oil and gas wells. Sand production mostly occurs in unconsolidated sandstone reservoirs with high rock porosity, low degree of...

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Problems solved by technology

At present, there is a rare set of critical production differential pressure prediction methods that consider special factors such as strong structural stress of such gas reservoirs, perforation blockage, large additional differential pressure, and fractures in the reservoir. Governance is difficult to formulate effective plans and take corresponding sand control measures

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