Three-spud-in deepwater-drilling annular pressure management method

Abstract

The invention discloses a three-spud-in deepwater-drilling annular pressure management method. The three-spud-in deepwater-drilling annular pressure management method includes the following steps of S1, surface layer treating, wherein a well hole is drilled to the position 70 m to 80 m deep, and a water-secluding pipe is put in and fixed; S2, first spud in, wherein the well hole is drilled to theposition 600 m to 700 m under the mud surface, then a drill bit is pulled out, a casing pipe is put in, and then cement slurry is poured till annular gaps are filled, and is returned to the mud surface; S3, second spud in, wherein the well hole is drilled to the position 1,500 m to 1,700 m under the mud surface, then the drill bit is pulled out, a casing pipe is put in, a pipe string is hung to the position 140 m to 160 m above an upper casing pipe shoe, and cement slurry is poured into an annular part, is returned, and is controlled to the position 10 m to 20 m under a hanger; S4, third spudin, wherein the well hole is drilled to a target layer, then the drill bit is pulled out, a casing pipe is put in, a well opening is installed, cement slurry is poured into the annular part, head cement slurry is returned to the position 90 m to 110 m under the upper casing pipe shoe, the annular part above the head cement slurry is filled with nitrogen, the length of barrier fluid between the head cement slurry and tail cement slurry is 240 m to 260 m, the full annular part under the barrier fluid is filled with tail cement slurry, solidification is carried out, and then solidified cement slurry is transferred into well completion. According to the three-spud-in deepwater-drilling annular pressure management method, operation safety of a three-spud-in deepwater well can be improved, and the method can be widely applied to the field of petroleum drilling.

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 three-time deep-water drilling annular pressure management method. 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] Traditional three-time deepwater well annular pressure management is usually as follows: (1) the surface layer is sealed with a full annulus, and the cement is returned to the mud surface; (2) the first well is sealed as appropriate, ...

AI Technical Summary

Problems solved by technology

This management method may be applicable in areas with low formation pressure, but in formations with high formation pressure, especially formations with high gas content, it may cause annular pressure and seriously affect the safety of field operations

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