A downhole oil sand control filter pipe

Abstract

The invention discloses an under-pit petroleum sand-preventing filter tube. The under-pit petroleum sand-preventing filter tube comprises a base tube and a coating layer, wherein one end of the base tube penetrates through a fixing base, the other end of the base tube penetrates through a fixing ring, the base tube is covered by the coating layer, the coating layer comprises a protruding coating net, a 20-square-mesh net, a contrast mat net, a 20-square-mesh net, a 10-square-mesh net and a round-mesh net from inside to outside, one end of the coating layer is welded on the fixing ring in a sealing mode, the other end of the coating layer is welded on the fixing base in a sealing mode, a gap enabling petroleum to circulate along the outer wall of the base tube is formed between the outer wall of the base tube and the inner wall of the fixing base, a sealing sleeve is installed at the other end of the fixing base, the other end of the sealing sleeve and the base tube are arranged in a sealed, a collecting chamber is formed between the sealing sleeve and the outer wall of the base tube, and a circulating hole is formed in the portion, with the collecting chamber located, of the base tube. The under-pit petroleum sand-preventing filter tube has the advantages that due to the fact that selection and usage of the filter screen of a composite filter tube are adjusted, oil with high quality can be produced; due to the fact that a regulating valve with a valve core made of tungsten carbide is installed on the circulating hole, the service life of the base tube is greatly improved, and the quality of extracted oil is more stable.

Description

technical field [0001] The invention relates to the field of petroleum exploitation, in particular to a downhole petroleum sand control filter pipe with long service life of the base pipe. Background technique [0002] Existing oil exploration usually adopts metal mesh cloth composite screen pipe, opening flow holes on the base pipe, and winding multi-layer metal filter screens outside the base pipe with holes. One end of the base pipe is designed with threads, and the other end is designed with threaded sleeves. The multi-section base pipes are connected to each other in the underground oil production layer. The oil with sand enters the base pipe through the filter screen and through holes, and the qualified oil is pumped to the ground in the base pipe. Such as Chinese patent number ZL200920023514.3, ZL200720069195.0. [0003] However, with the above-mentioned metal mesh composite screen pipe, due to the long-term erosion of crude oil on the sand-proof filter material, a l...

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Problems solved by technology

[0003] However, with the above-mentioned metal mesh composite screen pipe, due to the long-term erosion of crude oil on the sand-proof filter material, a large number of flow holes are directly opened on the base pipe. These flow holes are not resistant to acid, alkali, and high temperature erosion. The diameter of the flow hole becomes larger, resulting in excessive liquid production and high flow rate, which will cause erosion and damage to the sand control screen, and increase the sand content of the oil product, causing the base pipe to be scrapped early

In addition, in order to improve the quality of oil products, the filtering effect of the above-mentioned metal mesh cloth composite screen is not ideal.

[0004] And, when exploiting crude oil, in different geological structures, in addition to crude oil, there are usually various gases and a large amount of water in oil-bearing rock formations. In the prior art, crude oil, various gases and a large amount of water are usually Pumped up to the ground together, and then carry out subsequent processing, however, if all pumped to the ground indiscriminately, it will cause a lot of processing costs and cause great waste

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