A backstop device for well pipe grouting

Abstract

The invention discloses a well pipe grouting check device which comprises a valve body, a buoyancy fixing plate, a guide cylinder, a sealing pressing plate, a support bracket and a spring, wherein the buoyancy fixing plate is arranged in the valve body and provided with a through hole structure, the guide cylinder is located in the through hole of the buoyancy fixing plate, the sealing pressing plate is installed on one end surface of the guide cylinder, the support bracket is installed on the buoyancy fixing plate, and the spring is installed between the support bracket and the sealing pressing plate. A grouting hole is formed in the side wall of the guide cylinder. The well pipe grouting check device is simple in structure, easy to process, convenient to assemble, light in the whole piece, low in requirement for the power system, safe, easy to operate, low in requirement for the bearing capability of a drill tower or a gantry crane, safe in use, and capable of greatly improving the construction efficiency.

Description

technical field [0001] The invention relates to a backstop device for well pipe grouting, which belongs to the technical field of mining machinery and equipment, and is mainly used for large-diameter super-tonnage drilling projects such as deep and large-diameter gas drainage wells, drainage holes, material delivery holes, and emergency escape and rescue channels. Well pipe floating installation sinking and solid pipe grouting backstop equipment. Background technique [0002] In deep and large-diameter gas drainage wells, drainage holes, material delivery holes, emergency escape and rescue channels and other drilling projects, during the lowering and installation of large-diameter and super-tonnage well pipes, due to the insufficient carrying capacity of the drilling tower or gantry crane, it is necessary to The safe installation of the well pipe is put in place, and most of the construction uses the buoyancy plug sinking technology to float and sink. This technology must ma...

AI Technical Summary

Problems solved by technology

[0002] In deep and large-diameter gas drainage wells, drainage holes, material delivery holes, emergency escape and rescue channels and other drilling projects, during the lowering and installation of large-diameter and super-tonnage well pipes, due to the insufficient carrying capacity of the drilling tower or gantry crane, it is necessary to The safe installation of the well pipe is put in place, and most of the construction uses the buoyancy plug sinking technology to float and sink. This technology must make the buoyancy plug at the bottom of the well pipe. This technology has the following problems: 1. The production of the buoyancy plug is time-consuming and laborious , it is necessary to intercept a well pipe with a length of 5m, add a welded steel retaining ring in the pipe body, use 425 No. 425 ordinary silicon cement and medium-coarse sand at a ratio of 1:2 to make cement mortar for 3m, and use yellow sand to pave 1m at the bottom. less than 7 days

2. After the installation of the well pipe is completed, it is necessary to inject retarded cement into the space between the well wall and the well pipe. First, the buoyancy plug must be opened by drilling with a drilling tool, and then the slurry shall be injected until it is full. However, due to the retarded cement The solidification time is long, which makes it difficult to grasp the drilling time. If you get up early, the cement slurry will not solidify, and the cement in the annular space will flow back to the well pipe during the drilling process, which will affect the pipe solidification effect; The solidification of cement slurry in the hole causes blockage, which makes the drilling tool unusable

[0003] Therefore, the existing technology has many problems such as low construction efficiency, uncontrollable construction process, complicated equipment manufacturing, etc., which seriously affects the development of the industry.

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