Expandable sand control screen pipe

Abstract

The invention relates to an expandable sand control screen pipe used for the sand control field of oil well completion, consisting of three-layer structure of an expansion base pipe, a filter medium and a metal protective casing. The expandable sand control screen pipe is characterized in that seam grooves are uniformly cut at the expansion base pipe axially; expansion joints which are respectively welded at the two ends of the expansion base pipe expand in advance and are coupled by common threads; the filtering medium adopts a two-layer filter net structure; the filtering medium is externally coated with the metal protective casing which is integrated with the expandable base pipe by welding; when in expanding, the seam grooves of the expandable base pipe and the protective outer cover are opened, and the metal filter net realizes expansion by mutual sliding. The expandable sand control screen pipe has the advantages that seal-cutting mode with mutual lapping is adopted, two ends of the seam grooves adopt arc transitional structures, thus avoiding stress concentration; the filtering medium adopts the two-layer filter net structure, and realizes expansion by sliding and the sand control effect is not influenced by the expanding process; and the outer wall of the expanded screen pipe can be clung to the well wall, thus eliminating ring space of the screen pipe and the well wall and improving sand control effect of the screen pipe.

Description

technical field [0001] The invention is applicable to the fields of petroleum drilling and completion, sand control repair and the like, and is an expandable sand control screen. Background technique [0002] Unconsolidated sandstone reservoirs in my country have a wide distribution range, large reserves, and production occupies an important position. Sand production in oil wells is a common problem in the exploitation of unconsolidated sandstone reservoirs. The harm of sand production is mainly manifested in the following aspects: affecting the normal production of oil wells, increasing production costs, destroying formations, and polluting the environment. [0003] Most of the traditional sand control technology is at the cost of sacrificing part of the production capacity. Gravel pack completion is prone to deep filtration, causing screen blockage and affecting production. The operating equipment is complex and expensive; in the field of mechanical sand control, wire-wra...

AI Technical Summary

Problems solved by technology

Gravel pack completion is prone to deep filtration, causing screen blockage and affecting production. The operating equipment is complex and expensive; in the field of mechanical sand control, wire-wrapped screens, slotted screens, metal wool screens, and TBS screens have appeared successively. These screens have the following problems:

[0004] First, when the formation sand is poorly sorted, it is difficult to form a high-permeability oil flow channel. When the oil flow passes through, a large pressure drop is caused, which increases the flow resistance of the oil flow and limits the production of the oil well;

[0005] Second, due to the presence of sand rings, it is easy to jam the screen during salvage operation, resulting in overhaul, increasing the difficulty and cost of the operation

[0007] At present, the expandable sand control screen (ESS) developed by Weatherford Company has been popularized in foreign oilfields, and the effect is good, but there are still complex completion techniques and equipment, large expansion force required, tensile and torsion resistance of expansion and screw joints Weakness and other defects

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