A variable diameter sand control screen

Abstract

The invention discloses a variable diameter sand control screen which comprises a mandrel connected with an oil pipe, an upper connector, a lower connector, a plurality of split sand control screen sheets and sand blocking steel plates, wherein the upper connector and the lower connector are used for connected with a tool, and the two ends of the mandrel are sleeved with the upper connector and the lower connector correspondingly; each sand blocking steel plate is located between two corresponding sand control screen sheets; and the multiple split sand control screen sheets and the multiple sand blocking steel plates just form a complete circumferential outline and are connected to the upper connector and the lower connector through hinge mechanisms. In the natural state, a gap of a certain size is reserved between every two adjacent sand control screen sheets, and each sand blocking steel plate is located on the inner sides of the two corresponding adjacent sand control screen sheets and inside the corresponding gap in a blocking mode; and in the variable diameter state, the hinge mechanisms expand outwards to support the split sand control screen sheets and the sand blocking steel plate to expand simultaneously in the radial direction, and the multiple split sand control screen sheets and the multiple sand blocking steel plates just form the complete circumferential outline. The problem that sand blocks test pipe column runners and buries packers is solved.

Description

technical field [0001] The invention relates to a sand control screen, in particular to a variable diameter sand control screen. Background technique [0002] Sand production from oil wells is a long-term problem in the development of unconsolidated sandstone reservoirs and pipe string operations. Well test, as a kind of oil well string operation, can obtain formation productivity and fluidity data under dynamic conditions. With the existing construction technology, the pipe string often needs to stay in the well for half a month or even longer. During this process, due to the recovery and release of formation pressure and the flow of wellbore fluid during oil testing, formation sand production will often be caused. On the one hand, formation sand production will lead to blockage of the test string, so that the well test cannot be taken completely. Quasi-stratigraphic data; on the other hand, the sand produced in the formation will accumulate above the packer, causing the ...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a variable-diameter sand control screen with a simple structure, which can realize the expansion of the sand control screen through simple operations on the ground, and solve the problem of sand blocking the flow channel of the test string and the sand burial of the packer. question

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