Five-drilling-times deep well annular pressure managing method

Abstract

The invention discloses a five-drilling-times deep well annular pressure managing method. The five-drilling-times deep well annular pressure managing method includes the steps that S1, surface layer operation is carried out, specifically, a marine riser is placed in a borehole and is fixed after the borehole is drilled; S2, the first time of drilling is carried out, specifically, a drill is pulledout after the borehole is drilled below the mud surface, a first-time-drilling sleeve is placed inside, and cement paste is injected and returns to the mud surface; S3, the second time of drilling iscarried out, specifically, the drill is pulled out after the borehole is drilled below the mud surface by 1500-1600m, a second-time-drilling sleeve string is placed inside, and cement paste is injected and the returning height is controlled to be below a hanger by 35-45m; S4, the third time of drilling is carried out, specifically, the drill is pulled out when drilling to a target layer, a third-time-drilling sleeve is placed inside, a wellhead is installed, and filling of nitrogen is carried out after cement paste is injected and returns to below an upper layer sleeve shoe by 120m; S5, the fourth time of drilling is carried out, specifically, the drill is pulled out when drilling to the target layer, a fourth-time-drilling sleeve is placed inside, a wellhead is installed, cement paste isinjected, and the first layer of cement paste returns to be below the upper sleeve shoe by 120m; and filling of the nitrogen is carried out above the first layer of cement paste, and a spacer fluid section is located between the first layer of cement paste and the tail layer of cement paste; and S6, the drill is pulled out when the borehole is drilled to the target layer, a tail sleeve string isplaced inside, the cement paste is injected, and the following operation is carried out after the cement paste is solidified. The five-drilling-times deep well annular pressure managing method can solve the problem that a five-drilling-times deep well is prone to generating annular pressure.

Description

technical field [0001] The invention belongs to the technical field of drilling engineering for resources such as oil and natural gas, and in particular relates to a method for managing the annular space pressure of a five-time deep-water well. Background technique [0002] At present, many oil and gas wells at home and abroad have serious annulus pressure phenomenon. On land or offshore platforms with shallow water depth, it is relatively easy to manage the annulus pressure; On the bottom of the seabed with a water depth of one meter, it is difficult to deal with the problem of annular pressure. Therefore, it is necessary to manage well during the drilling process to avoid the problem of annular pressure after the drilling operation is completed. [0003] The traditional annulus pressure management of deepwater wells for five times is usually: (1) the surface layer is sealed with the full annulus, and the cement is returned to the mud surface; (2) the first well is sealed a...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to avoid the deficiencies in the prior art and provide a five-time deep-water well annulus pressure management method to solve the problem that five-time deep-water wells are likely to cause annular pressure, so as to improve the five-time deep-water well. job safety

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