Full-hydraulic multifunctional wellhead device

Abstract

The invention relates to a full-hydraulic multifunctional wellhead device. The device comprises a wellhead workbench, slide ways, movable cassettes, semicircular bayonets, taper hole seats, taper centering guide holders and clasp components, wherein the upper side of the wellhead workbench is provided with the slide ways arranged on the left side and the right side; the slide ways are provided with two movable cassettes on the left side and the right side; a joint of the two movable cassettes is symmetrically provided with left and right semicircular bayonets; taper hole seats are arranged inthe bayonets; the taper centering guide holders are arranged in the taper hole seats; and the clasp components are arranged in the taper centering guide holders. The device adopts guide holder taper centering and flange positioning, clasps are centered by taper circles, slip by dead weight along the guide of the guide holder flange and are automatically clamped and self locked. The device can quickly and conveniently replace the clasps with different specifications, quickly centers, and safely and reliably clamps drill pipes or sleeves. A buffering device can ensure that the clasps can be easily and conveniently disassembled when replaced under the conditions of reliable clamping. The device can meet the requirements of drilling by multiple-process methods of multifunctional full hydraulic coal bed methane drilling machines and requirements of placing sleeves with various specifications and diameter dimensions. The device has the advantages of complete functions, convenient operation,quickness, safe and reliable use and compact structure.

Description

technical field [0001] The present invention relates to a technical equipment for the exploration and development of resources such as coal, coal-bed methane, and natural gas, especially a full-hydraulic multifunctional coal-bed methane drilling rig used for coal-bed methane exploration, mining, gas pumping and discharge, and emergency construction of coal projects. Fully hydraulic multifunctional wellhead device. Background technique [0002] All over the world, with the depletion of oil and gas resources and the continuous enhancement of people's awareness of environmental protection, the exploration, development and utilization of clean energy-coal-bed methane has become one of the natural energy that people attach great importance to. The attractive potential of coalbed methane comes first from its huge reserves. In the United States, coalbed methane reserves shallower than 2000m are equivalent to more than half of conventional natural gas reserves. In my country, coal...

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Problems solved by technology

Practice has shown that none of the above three types of drilling rigs are well suited to the drilling requirements of coalbed methane development wells, and the following problems obviously exist:

[0006] 1. Oil drilling rigs are used for coalbed methane exploration and construction, which can meet the drilling requirements in terms of function. There are drilling platforms, and wellhead devices and blowout preventers can be arranged. The supporting cost is too expensive, the construction cost is too high, and because of the huge equipment, the high cost of well site leveling and road construction, the long period of equipment relocation, many difficulties, and the high relocation cost, it is difficult to be widely used

[0007] 2. Water source drilling rigs are used for coalbed methane exploration and construction. Because the equipment cost is lower than that of oil drilling rigs, the construction cost is relatively low. Because there is no drilling platform, it is not convenient to arrange wellhead devices and blowout preventers. Blowout and gas leakage may occur during construction. It is a serious safety hazard, and it is also driven by a turntable, so there are problems of inability to pressurize and low work efficiency

[0008] 3. The traditional vertical shaft core drilling rig has low equipment investment cost, has a vertical shaft pressurization function, and has a slightly higher drilling efficiency. The problem is that there is no drilling platform, and it is not convenient to arrange wellhead devices and blowout preventers. shallow hole

[0009] 4. The above types of equipment are not suitable for large-diameter drilling, and cannot run large-diameter casings and drilling tools

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