A kind of open-hole well outside wrapping expansion filling sand control method

Abstract

The invention relates to an open hole well external inclusion expansion packing sand control method. An external inclusion high-expansion packing sand control screen is tripped into a voided space, afree extension external inclusion continuously stretches outwards under the action of high pushing pressure difference of sand-carrying fluid solid particles until the outer wall of the free extensionexternal inclusion is fitted with an open hole well wall, and packing sand control is realized. According to the sand control method, a high-thickness, high-filling-compactness and high-stability packing strip is formed in immediate vicinity of wellbore of a target sand control layer, and a sand barrier is high in overall sand control strength and long in sand control validity period. The overallsand control strength of the sand barrier is improved, the water content of an oil-gas well can be effectively reduced, and the sand control validity period is prolonged.

Description

technical field [0001] The invention relates to a sand control method for wrapping expansion filling in an open hole well, and belongs to the technical field of sand control in oil and natural gas exploitation. Background technique [0002] Among the conventional oil and gas reservoirs in my country and the world, more than 70% are weakly cemented unconsolidated sandstone reservoirs, among which there are many quicksand and semi-quick sand reservoirs with extremely weak cementation. In addition to oil and natural gas reservoirs, natural gas hydrate reservoirs are also typical quicksand and semi-quick sand reservoirs. Sand production in such quicksand and semi-quick sand reservoirs is very serious during the mining process. The so-called sand production refers to the phenomenon that the 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 hyd...

AI Technical Summary

Problems solved by technology

[0003] (1) In the conventional sand control process, gravel packing is carried out between the screen pipe and casing (or oil layer), and the thickness of the formed gravel packing layer is 20mm. Under the condition of sand production, it is very easy to be blocked by invasion, or even invaded and penetrated, resulting in sand production in the wellbore and a significant decline in the production of oil and gas wells;

[0004] (2) The filling zone formed by the conventional gravel filling sand control method in the underground, due to the limitation of construction technology and other factors, cannot obtain a high degree of filling density, is easily invaded, has poor sand retaining effect and production decline, and even causes the formation sand to directly The impact of the sand control screen occurs, and the validity period of the sand control is very short

[0005] (3) Due to the large amount of sand produced in the quicksand and semi-quick sand reservoirs during the mining process, the near-wellbore area is prone to form a void area that cannot be filled by the gravel layer, which will lead to a large production pressure difference in the gravel pack during the production process. Migration and overturning occur under the target reservoir, and a stable sand-retaining barrier cannot be formed in the target reservoir, resulting in sand control failure

Its purpose is only to achieve "zero annulus", but it is very difficult to remove after failure

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