Drilling-plug free tubular column with sand control and well cementation for open-hole horizontal well

Abstract

The invention relates to a drilling-plug free tubular column with sand control and well cementation for an open-hole horizontal well, which comprises an external tubular column and an inner tubular column. The external tubular column comprises a sand control screen (2), an open-hole packer (3), an external positioning step (4), an external cementing machine (5) and a sleeve tube (6) are sequentially installed and connected on the an acid-washing filling valve (1). The inner tubular column comprises an oil tube (8) and an inner cementing machine (7) which is installed and connected on the oil tube (8). The inner tubular column is arranged in the external tubular column and the inner tubular column and the external tubular column are mutually fixed sealed. The invention can simplify operating procedures and reduce the frequency of running string, and does not need to perform drilling-plug operation free after cementing for well cementation, and also has the advantages of low operating cost, large drift diameter, regular inner wall, clean well-hole of sand control and well completion, high construction success ratio, large construction stability, low labor intensity, high oil well yield and the like, and can be widely applied to the process of sand control, well cementation and well completion of the open-hole horizontal well for oil exploration.

Description

1. Technical field [0001] The invention relates to an oil production downhole pipe string, in particular to a plug-free sand control cementing pipe string for an open-hole horizontal well. 2. Background technology [0002] Horizontal wells for oil exploitation adopt the method of open-hole completion, which has the advantages of increasing the contact area between the well body and the oil layer, releasing formation energy to a greater extent, increasing oil well production, and developing efficiently with fewer wells. At present, open-hole horizontal wells mainly adopt the two-split sand control completion method, and the sand control completion string mainly adopts a downhole string with a blind plate. The following shortcomings or deficiencies: ① After the cementing string is run into the well, it is necessary to run in the drill plug string to carry out the plug drilling operation, and it is necessary to drill the shut-off plug, the inner cavity of the grading hoop, the ...

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Problems solved by technology

At present, open-hole horizontal wells mainly adopt the two-split sand control completion method, and the sand control completion string mainly adopts a downhole string with a blind plate. The following shortcomings or deficiencies: ① After the cementing string is run into the well, it is necessary to run in the drill plug string to carry out the plug drilling operation, and it is necessary to drill the shut-off plug, the inner cavity of the grading hoop, the cement plug and the blind plate, etc. Partly, the drill plug cycle is long, and the WOB is difficult to control; ② There are risks of casing sidetracking, downhole casing loosening and drill sticking; ③ Drilling cuttings are easy to be left in the horizontal section of the pipe string during the drilling process, and subsequent operations are carried out , the tool with a larger outer diameter is likely to be blocked or stuck in the horizontal section; ④ Since the open hole annulus and the casing string are separated by the blind plate, during the running of the string, the mud in the open hole It cannot be discharged from the casing string, and it is forced to squeeze into the formation, which increases the pollution of the mud to the formation and affects the production of the oil well; It is troublesome to manually fill the casing with grout; ⑥The success rate of the operation is low

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