Sand control screen for horizontal well gravel packing

Abstract

The invention provides a sand control sieve tube used for filling a horizontal well with gravels. The sand control sieve tube comprises a base tube and sand control assemblies, wherein the base tube and the sand control assemblies are located in the horizontal well. At least two grooves are formed in the outer wall of the base tube, and through holes communicating with an inner cavity of the base tube are formed in the bottoms of the grooves. The sand control assemblies are embedded in the grooves correspondingly. Each groove is provided with a positioning side wall and a guiding side wall opposite to the positioning side wall, and a slope which inclines outwards is arranged on each guiding side wall. Each sand control assembly is provided with a first side and a second side opposite to the first side, wherein the first side abuts against the corresponding positioning side wall, and an sand cavity which is open outwards is formed between the second side and the corresponding guiding side wall. Each sand control assembly further comprises at least two filter pieces which are arranged in the circumferential direction of the base tube in a spaced mode, wherein a gasket is arranged between the upper portions of every two adjacent filter pieces in a clamped mode, and an overflow gap is formed between every two adjacent filter pieces and located below the corresponding gasket and communicates with the corresponding through hole in an aligned mode. According to the sand control sieve tube, the sand control assemblies can be protected both in the construction process and the production process, and the situation that the overflow gaps are scoured to become large and consequentially fail is prevented.

Description

technical field

[0001] The invention relates to the technical field of oil and gas exploitation, in particular to a sand control screen for horizontal well gravel packing. Background technique

[0002] Most of the reservoirs in Liaohe Oilfield are unconsolidated sandstone oil and gas reservoirs, and the problem of sand production is serious. Necessary sand control measures must be taken in the production process; application. The principle of horizontal well gravel packing is to use sand-carrying fluid to fill the filling sand into the annular space between the screen pipe and the formation, and use the sand filling to prevent the formation sand in the formation from entering the screen pipe; the sand control technology of horizontal well gravel packing can be divided into construction and production.

[0003] The construction process of horizontal well gravel packing sand control technology is as follows: Please refer to figure 1 As shown, the sand-carrying fluid carries...

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