Raising-out type ball seat

Abstract

The invention relates to a drilling device, in particular to a ball seat for drilling, comprising a pipe nipple, a pressed cap, a ball, a ball seat body, a sealing ring and a housing, wherein, the short barrel wall is provided with a pressure transmitting hole, the pressed cap is supported by the horizontal circular surface on the pipe nipple, the inner part of the lower section of the ball seat body is provided with a taper hole, the outside surface is provided with the sealing ring; and a taken-out ball seat can be directly connected to the lower part of a hanger to make the pitch easier and make the implementation of building the pressure of the hanger easier. The drilling device solves the problems of the on-site horizontal well sieve tube well cementation and the absorption well cementation, thereby shortening the well completion cycle, lowering the operation cost, raising the drilling efficiency and having great popularization and application potential. The drilling device is used in the petroleum drilling field.

Description

technical field [0001] The invention relates to a cementing tool for petroleum drilling, in particular to a ball seat for pressure suppression of liner cementing. Background technique [0002] The completion of screen wells has played a good role in the production capacity of the formation. The screen completion technology is a new technology developed on the basis of the increasingly perfect horizontal well drilling technology. Horizontal wells for stimulation by cracking, sensitive oil and gas formations for horizontal wells with loose rock cementation but relatively homogeneous formations, and horizontal wells where casing perforation is not suitable for completion and formation collapse must be prevented. When there are many oil layers and short casings need to be run, there is no need for annulus cement injection, and only external packers need to be added at both ends of the screen. A tailpipe hanger is required. Its technological features: only suspension without ce...

AI Technical Summary

Problems solved by technology

This completion method is much simpler than the original completion method, and it can protect oil and gas layers; however, its operation procedures are also very complicated, requiring three drillings to complete the well, and it also has the advantages of long drilling cycle, Disadvantages of high cost

[0005] In the screen completion, sometimes the casing / screen that needs to be hung is very short, and it is not suitable for cementing. You only need to hang the liner string and set the packer to complete the well. If you use the conventional hanger 2+ Blind plate 8 / ball seat 5+packer 9, after the feeding tool 1 is raised, it is necessary to drill down to remove the blind plate 8 / ball seat 5, which wastes time and increases costs; in addition, in highly deviated wells and In horizontal wells, the ball seat 5 is often placed in a highly deviated well section, and the ball 24 is likely to stay at a certain casing collar position, and it is difficult to reach the ball seat 5, resulting in failure of the seat hanger

Images