Sand control well completion structure capable of easily pulling out underground sand control pipe column

Abstract

The invention belongs to the technical field of oil exploitation, and particularly relates to a sand control well completion structure capable of easily pulling out an underground sand control pipe column. The sand control well completion structure comprises a loose sandstone stratum, an isolation body filling layer and the sand control pipe column, a wellhead is formed in the loose sandstone stratum, the sand control pipe column is arranged in the wellhead. The isolation body filling layer is arranged on the periphery of the sand control pipe column and located in the wellhead, a positioning mechanism is arranged at the upper end of the wellhead, a packing mechanism is arranged at the upper end of the positioning mechanism, the positioning mechanism comprises a seat ring, a limiting insertion cylinder and a positioning sliding cylinder, the bottom end of the seat ring is fixedly connected with the limiting insertion cylinder, the limiting insertion cylinder is inserted with the upper end of the wellhead, and the positioning sliding cylinder is arranged in the limiting insertion cylinder. According to the sand control well completion structure capable of easily pulling out the underground sand control pipe column, through the arrangement of the positioning mechanism and the packing mechanism, the sand control pipe column can be put in and pulled out relative to the wellhead conveniently, packing protection can be conducted on the upper portion of the isolation body filling layer, and the using effect is good.

Description

Technical field [0001] The present invention belongs to the technical field of oil exploration, particularly relates to a structure of a well completion sand easily removed sand downhole string. Background technique [0002] Global oil and gas fields there is a lot of sand-prone unconsolidated sandstone reservoir for unconsolidated sandstone reservoir of oil and gas wells, both vertical wells, deviated or horizontal wells, sand production is one of the oil field development often encountered problems, which prevent the downhole formation sand is extremely important that the current oil and gas wells commonly used mechanical sand control technology, there are two: one is the sand column sand in oil and gas wells, and the other one is the first string down into the sand, and after a sand column gravel packing the wellbore annulus, using the barrier formation sand gravel into the wellbore, operation when extubation, formation sand or gravel sand clinging thereto tight string will ha...

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Problems solved by technology

[0004] However, the sand control well completion structure in the prior art, which is easy to pull out the downhole sand control string, still has the following deficiencies in the process of use: first, there is no good positioning between the sand control string and the wellhead, which is not conducive to sand control When the pipe string is placed in the middle of the wellhead and pulled up, the sand control pipe string in the wellhead is easy to deflect, which further causes the thickness of the filled spacer packing layer around the sand control pipe string to be uneven, thus affecting the smooth uplift of the sand control pipe string. , when the tubing operation is performed, the spacer particles in the spacer packing layer are also adhered around the outer wall of the sand control string in the wellhead. The maintenance and next use bring inconvenience, and the sealing effect of the upper end of the isolator filling layer is not good after filling, the upper part of the isolator filling layer lacks good protection, and the external flying sand is easy to enter from the upper part of the isolator filling layer In the spacer filling layer, it is mixed with the spacer particles filled in the spacer filling layer, which increases the difficulty of repeated screening of the spacer particles in the spacer filling layer

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