Horizontal well one-time multi-section open-hole gravel pack sand-proof well completion pipe string and method

Abstract

The invention discloses a horizontal well one-time multi-section open-hole gravel pack sand-proof well completion pipe string and a method. The horizontal well one-time multi-section open-hole gravel pack sand-proof well completion pipe string comprises a well completion pipe string body and a pack sand-proof service pipe string body, wherein the pack sand-proof service pipe string body is arranged in the well completion pipe string body; the pack sand-proof service pipe string body comprises a drilling-free plug stage collar, a packing sliding sleeve assembly and sand filtering tubes, and the drilling-free plug stage collar, the packing sliding sleeve assembly and the sand filtering tubes are sequentially connected from front to back; the pack sand-proof service pipe string body comprises a liquid separation sealing device, a double-layer pipe, an upper positioning device, a packing assembly, a circulation assembly, a lower positioning device, a closing tool and an opening tool which are sequentially connected from the front to the back. At least two sand filtering tubes are arranged, and a heat-sensitive compensator and an open-hole packer are connected between every two sand filtering tubes. The tail end of the well completion pipe string is connected with a well washing valve. One-time multi-section packing can be achieved, infinite series packing can be achieved, segmented packing is achieved outside a pipe in a real sense for the first time, and the packing effect is improved. Horizontal section segmentation is completed, and requirements of post-selective production, segmented steam injection and other measures can be met.

Description

technical field [0001] The invention relates to a horizontal well completion technology used in an oil field, in particular to a once multi-section open hole gravel-packed sand control completion pipe string and a method for a horizontal well. Background technique [0002] Horizontal well open hole gravel packing sand control completion technology is one of the key sand control completion technologies for horizontal wells. Compared with open hole sand filter tube sand control completion technology, it has the advantages of better sand control effect and longer validity period, especially for fine sand / silty sand The oil reservoir has a good sand control effect, which can effectively improve the production capacity of the oil well. At present, the open-hole gravel packing sand control completion technology for horizontal wells currently used in China mainly uses general gravel packing, without effectively segmenting the horizontal section. During construction, there are probl...

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Problems solved by technology

At present, the open-hole gravel packing sand control completion technology for horizontal wells currently used in China mainly uses general gravel packing, without effectively segmenting the horizontal section. During construction, there are problems such as high construction pressure and insufficient packing. Due to the lack of segmentation, production measures such as selective production and staged steam injection cannot be carried out

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