Adaptive filling expansion scree tube and expanding method thereof

Abstract

The present invention provides one kind of adaptive filled expanding sieve tube for preventing sand in oil and gas well, and belongs to the field of petroleum drilling and extracting tool technology. The adaptive filled expanding sieve tube consists of supporting slotted tube, special filling coupler, radial expanding cover, radial expanding composite filter element, supporting rack, expanding block, expanding screw, plug and other parts. During well operation, the adaptive filled expanding sieve tube is set in the oil reservoir and filled with high pressure carrying solid particles, so that the composite filter element and the radial expanding cover can expand radially to contact with the inner wall of the production casing or the uncased hole to block sand and control the size of the passed sand. Compared with available technology, the present invention has the advantages of lowered expanding force, low operation cost and other advantages.

Description

technical field [0001] The invention belongs to the field of oil well drilling tools, and relates to an oil well self-adaptive filling expansion screen and an expansion method thereof, which are used for sand control in oil and gas wells. Background technique [0002] Sand production in oil and gas wells is a major problem that plagues the development of unconsolidated sandstone reservoirs. It not only easily leads to production reduction and shutdown of oil wells, but also aggravates the wear and tear of ground and downhole equipment. In severe cases, it can also cause damage to casings and scrapping of oil wells. According to reports, it is estimated that 40% of oil wells in the world need sand control, and this proportion is still increasing every year. This is because as the oil field enters the development period of ultra-high water cut, the production intensity is getting higher and higher, making the oil wells that do not produce sand originally Sand began to be produ...

AI Technical Summary

Problems solved by technology

[0003] Various existing expandable sand control screens are designed based on the principle of overall expansion, which inevitably has the following problems: if the wellbore is extremely irregular, the expansion screen will compact the near-wellbore zone at the point where the well diameter is reduced, It is not easy to restore the original state of the formation during production. For the expanded hole diameter, the "zero gap" between the screen and the well wall or casing annulus cannot be realized, which affects the sand control effect; The situation will cause the expansion to be interrupted, and it is difficult to obtain satisfactory results; it is impossible to realize layered mining and layered control; limitations in mobility, etc.

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