High-water-cut oil well sand prevention and precipitation method

Abstract

The invention discloses a high-water-cut oil well sand prevention and precipitation method, and belongs to the technical field of oil field oil extraction. According to the high-water-cut oil well sand prevention and precipitation method, a proper amount of sand prevention and precipitation particles are squeezed in firstly, then gravel filling sand prevention construction is conducted, the sand prevention and precipitation particles are solidified to form a blocking layer under the condition that an oil layer is not polluted, a large hole channel formed by injected water or edge and bottom water is blocked, and meanwhile gravel and a screen pipe form a high-flow-guide sand blocking belt. According to the method, a composite gravel filling mode is adopted, sand prevention and precipitation particles are combined with quartz sand used for mechanical sand prevention, the sand prevention and precipitation particles capable of being solidified are firstly filled to form an oil seepage and water blocking sand blocking barrier, and then multi-particle-size quartz sand is adopted for filling to form a high-permeability sand blocking barrier. According to the method, the advantages of two sand prevention technologies are integrated; and the double effects of effective precipitation and effective sand prevention are achieved, the purposes of sand prevention, precipitation and oil increase are achieved, and the production requirement of the high-water-cut period is met.

Description

technical field [0001] The invention relates to the field of oil recovery technology, in particular to a method for sand prevention and dewatering of high water-cut oil wells in unconsolidated sandstone reservoirs. Background technique [0002] In most unconsolidated sandstone reservoirs at home and abroad, the water cut rises in the middle and late stages of development, and the clay-based oil layer cement expands and becomes loose when it encounters water, and the cementation strength decreases, and then the particle displacement occurs, which greatly intensifies the sand production degree of the formation. At the same time, the production method of large pump liquid extraction or excessive working system, resulting in excessive production pressure difference will also cause sand production to intensify. However, as a large amount of sand is produced in the production oil layer, the formation collapses and large pores are formed, which further leads to high water cut or ev...

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Problems solved by technology

[0004] In view of the development status and current technological conditions in the high water-cut period, in order to solve the problems of precipitation and sand production in high water-cut wells, the embodiment of the present invention provides a method for sand control and precipitation in high water-cut oil wells

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