Supporting rotating control head of underbalanced coal bed methane well drilling

Abstract

The invention relates to a supporting rotating control head of an underbalanced coal bed methane well drilling, which is mainly used for an underbalanced well drilling and belongs to the filed of well control equipment of underbalanced well drillings. The supporting rotating control head comprises a rotating assembly, a hoop assembly and a shell assembly, the rotating assembly is arranged in the shell assembly, the hoop assembly installed on the upper end of the shell utilizes a manual mode to close the hoop body, and the rotating assembly is fixed to complete equipment assembling. The inner side of the hoop body is provided with a two-cone to strengthen righting effect, the rotating assembly utilizes a centralization lubrication structure to lubricate a centripetal force and push bearingcombination and a dynamic seal component to prolong the service life of equipment, the lower end of the rotating assembly is provided with a rubber core to guide returning drilling medium to realize safety control. The shell assembly utilizes a structure of separating the shell body and a bypass port, thus facilitating replacement, enhancing the continuous working capability and improving equipment use ratio of the control head. The device has simple and compact structure, easy transportation, low equipment cost, maintenance convenience, and high stability and safety, and is suitable for needs of coal mining with three areas, namely area low in pressure, saturation and infiltration geological characteristics in China.

Description

technical field [0001] The invention belongs to a well control device in coalbed methane drilling operations, and in particular relates to a rotation control device for providing safe and effective wellhead pressure control and guiding liquid in wells in coalbed methane underbalanced drilling operations. Background technique [0002] The development of coalbed methane in my country started relatively late, and the basic theory and technology cannot be compared with conventional natural gas development. In particular, the special "three lows" of coal seams, namely low pressure, low saturation, and low permeability geological characteristics, have resulted in the production of single wells of coalbed methane. Generally low, while my country's current coalbed methane drilling technology is relatively single, the existing drilling technology, equipment and tools are mostly borrowed from oil drilling, and do not match the special working conditions of coalbed methane drilling, resu...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a rotary control head device specially used for coalbed methane underbalanced drilling, on the one hand, it can solve the problem of unmatched equipment and working conditions, and on the other hand, it can solve the problem of unbalanced input and output, that is, single well Low output and high input cost to achieve stable and safe drilling of coalbed methane wells at low cost

Images