High-strength compound sand-prevention screen pipe and manufacture method thereof

Abstract

The invention relates to a high-strength compound sand-prevention screen pipe and a manufacture method thereof, in particular to a compound sand-prevention screen pipe which can be used for vertical wells and directional wells and can separate oil from sand in the oil gas exploitation processes of horizontal wells. The sand-prevention screen pipe comprises a coupling hoop, a base pipe and compound sand-prevention filtering sleeves, wherein both ends of the coupling hoop are connected with two casing pipes; the cylindrical surface of the base pipe is provided with a plurality of evenly distributed overflowing holes; the compound sand-prevention filtering sleeves are sleeved outside the overflowing holes of the base pipe; the compound sand-prevention filtering sleeves are formed by tightly sleeving outer protective sleeves, reverse diagonal metal mesh layers and triangular wire wrapped screen sleeves and end rings in sequence from outside to inside, wherein the triangular wire wrapped screen sleeves are formed by evenly and spirally encircling metal wires the triangular section apex angles of which are inward at intervals and respectively welding both ends of the metal wires to the inner sides of two supporting rings of the end rings. Thereby, the sand-prevention screen pipe has the characteristics of big overflowing area, high strength, good sand blocking effect, high reliability and the like, is not easy to block and has stronger deformation resistance in the use process.

Description

technical field [0001] The invention relates to a composite sand control screen and a manufacturing method thereof, in particular to a composite sand control screen which can be used not only in vertical wells and directional wells but also in the process of oil and gas exploitation in horizontal wells to separate oil and sand. Background technique [0002] At present, in order to prevent oil and gas wells from sanding to cause casing, equipment damage and production reduction, three different sand control screens are usually used in most oil and gas production processes. [0003] The slotted screen is a narrow slot of a certain length and width cut by a blade or a laser. The processing equipment is complex and the efficiency is low. The sand control precision of the product is not high, it is easy to corrode, and the service life is not long. It is mostly used in wells with low production, not serious sand production, large sand production particles and formation support. ...

AI Technical Summary

Problems solved by technology

However, the metal mesh screen adopts ordinary plain weave dense mesh, which still has many disadvantages: in order to increase the strength and reliability of ordinary plain weave dense mesh, simple superposition of multi-layer metal mesh is often used, so that the mesh The size is easy to change, and the mesh is easy to be blocked; the metal mesh is welded by resistance welding, which will cause damage to the mesh and reduce the strength; there is no matching empty sleeve between the metal mesh and the outer protective sleeve, and there is often Large gaps are easy to accumulate spun yarns, causing blockage, and it is not easy to backwash; at the same time, tests have proved that this type of screen tube has low internal pressure resistance, and it is easy to cause tearing of the mesh weld seam during reverse circulation of the screen tube, which brings great risks in use

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