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A re-entrant cone running method based on pipe-following drilling technology

A technology of pipe drilling and technology, applied in drilling equipment and methods, underwater drilling, earthwork drilling and mining, etc.

Active Publication Date: 2021-10-29
EXPLORATION TECH RES INST OF CHINESE ACADEMY OF GEOLOGICAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the data, there is no complete set of re-entrant cone feeding tools in China. At present, the relevant technology is monopolized by a few foreign companies, and only provides relevant technical services, and does not sell related products and technologies. The method of re-entrant cone running in the process to solve the above problems

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  • A re-entrant cone running method based on pipe-following drilling technology
  • A re-entrant cone running method based on pipe-following drilling technology
  • A re-entrant cone running method based on pipe-following drilling technology

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Embodiment Construction

[0034] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0035] like Figure 1 to Figure 13 As shown, a kind of reentrant cone lowering method based on the pipe drilling process of the present invention comprises the following steps:

[0036] S1. Put the mud pad 3 into the slip support plate of the moon pool cover: put the four corner plates fixed under the mud pad 3 into the slip support plate so that the mud pad 3 and the moon pool do not rotate relative to each other:

[0037] S2. Lower the casing 5 until it is close to the mud surface of the seabed: the distance between the bottom of the casing 5 and the mud surface is greater than the sum of the lengths of the drilling bit 9 and the eccentric reaming bit 8, and the distanc...

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Abstract

The present invention relates to the technical field of offshore engineering attachments, in particular to a re-entry cone running method based on the follow-through drilling process. The combination of the entry cone and the mud pad is lowered at the same time, and it can be automatically unlocked after being lowered to the position. The drilling tool and drill pipe are lifted out of the hole together, and the feeding work of the re-entry cone is completed at one time. S1. Put the mud pad into the moon pool In the slip support plate of the cover: S2. Lower the casing to close to the mud surface of the seabed; S3. Install the suspension jacket assembly; S4. Assemble and lower the drilling tool; S5. Install the locking pin and core tube of the feeding device; S6. Install the upper end drill pipe; S7. Install the re-entry cone; S8. Remove the moon pool cover and prepare for drilling; S9. Drill through the slurry; enter.

Description

technical field [0001] The invention relates to the technical field of marine engineering attachments, in particular to a re-entry cone lowering method based on a pipe-following drilling process. Background technique [0002] As we all know, in the process of drilling without riser in deep sea, when encountering hard formations, the drill bit is easy to wear and has a short service life. tools), and after the drill is pulled out, the drill will face the problem of drilling re-entry. In addition, as the formation changes, different types of drill bits need to be replaced. Similarly, around the engineering needs of oceanic scientific drilling, sometimes it is necessary to use drilling tools to send various testing instruments, observation stations, etc. into the well to meet different scientific research purposes. , will face the same drilling re-entry requirements. [0003] Casing in conventional drilling construction is divided into at least two steps, that is, first drill...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B7/12E21B7/20E21B7/28
CPCE21B7/12E21B7/20E21B7/28
Inventor 宋刚崔淑英牛庆磊邵玉涛陈晓林刘晓林陈根龙刘广韦海瑞
Owner EXPLORATION TECH RES INST OF CHINESE ACADEMY OF GEOLOGICAL SCI