Fracturing and sand prevention pipe column and fracturing and sand prevention method

Abstract

The invention provides a fracturing and sand prevention pipe column and a fracturing and sand prevention method. The fracturing and sand prevention pipe column comprises a casing pipe and an oil pipearranged in the casing pipe, an annular space is formed between the casing pipe and the oil pipe, a fracturing packer is arranged on the oil pipe, a ball seat and a sand prevention sieve pipe are arranged in the bottom end of the oil pipe in a sleeved mode, the ball seat is in threaded connection with the upper part of the sand prevention sieve pipe, the bottom end of the oil pipe is connected with a limiting device, the limiting device is located on the lower part of the sand prevention sieve pipe, and the length of the sand prevention sieve pipe is greater than the thickness of a reservoir by 20 to 30 meters; a female buckle is arranged at the top end of the sand prevention sieve pipe, and a limiting groove is formed in the limiting device; when a soluble ball is put to strike the ball seat, the ball seat drives the sand prevention sieve pipe to move downwards until the female buckle is clamped in the limiting groove; and after the sand prevention sieve pipe is in place, still standing is conducted for 48 hours, and the soluble ball is dissolved. According to the fracturing and sand prevention pipe column, under the situation of not conducting secondary well completion, it can beensured that stratum sand and fracturing sand do not flow back from a stratum, and fracturing and sand prevention is integrated.

Description

technical field [0001] The invention relates to the technical field of production and completion of oil and gas wells in oil fields, in particular to a fracturing sand control string and a method. Background technique [0002] In the field of petroleum exploration, especially for the exploitation of heterogeneous cemented unconsolidated sandstone reservoirs, it is often necessary to cooperate with fracturing operations to form deep-penetrating, high-conductivity fractures in the reservoir to increase oil well production. At the same time, sand production in oil wells is a common problem in the development of unconsolidated sandstone reservoirs. Sand production will cause a series of hazards such as sand buried oil layers, equipment corrosion, and well wall collapse, directly affecting the productivity and output of oil wells. [0003] In the prior art, a large amount of quartz sand or ceramsite needs to be filled in the formation during fracturing, and after fracturing, sand...

AI Technical Summary

Problems solved by technology

However, in the prior art, when the fracturing fluid is flowed back after the fracturing is completed, there is often the problem of fracturing sand returning back, which not only has a poor sand filling effect, but also brings many difficulties to the later sand washing

At the same time, due to the phenomenon of sand production in the heterogeneous loose sandstone itself, after fracturing, the secondary completion is directly carried out and the sand control screen is inserted. Repeated tripping operations will cause the bottom hole pressure to be lower than the formation pressure, resulting in the collapse of the formation well wall, which in turn leads to The screen cannot be lowered into the designated position, and the sand control effect cannot be achieved

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