Multi-section-plug high-saturation filling water and sand controlling method for silty fine sand reservoir

Abstract

The invention relates to a multi-slug high-saturation filling method for controlling water and sand in silt and fine sand reservoirs, belonging to the technical field of filling and sand prevention for oil and natural gas exploitation industries. The multi-stage sand retaining barriers are arranged in between, and the multi-stage sand retaining barriers include: the fourth-stage sand retaining barriers, the third-stage sand retaining barriers, and the second-stage sand retaining barriers arranged radially outwardly along the mechanical sand control screens and the first-stage sand retaining barrier; the first to third-stage sand retaining barriers respectively contain particles of corresponding particle sizes, and the present invention uses a four-stage sand retaining barrier formed by three-stage slugs, which solves the problem of single particle diameter in unconsolidated sandstone reservoirs. The sand control of gravel filling cannot meet the sand control requirements of oil wells with high water content in the late stage of silty sand reservoir exploitation. This method reduces the water content of oil wells and maximizes the silt and fine sand Production of wells with high water cut in reservoirs.

Description

technical field [0001] The invention relates to a multi-slug high-saturation filling method for controlling water and sand in fine sand reservoirs, and belongs to the technical field of filling and sand prevention for oil and natural gas exploitation industries. Background technique [0002] Among the conventional oil and natural gas reservoirs in my country and the world, more than 70% are weakly cemented unconsolidated sandstone oil and gas reservoirs, and sand production is serious during the mining process. The so-called sand production refers to the phenomenon that formation sand particles are produced to the wellbore or the ground along with the formation fluid during the exploitation of oil and natural gas loose sandstone reservoirs and natural gas hydrate reservoirs; sand control is currently the main way to solve the sand production problem. At present, the commonly used sand control technology is to use single-size gravel to form a sand-retaining barrier between th...

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Problems solved by technology

[0003] Aiming at the deficiencies of existing oil wells and water-producing gas well mining sand control technology, the present invention provides a multi-slug high-saturation filling method for water control and sand control in fine sand reservoirs

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