Erosion reducing system for gas drilling
A gas drilling and erosion technology, which is applied in the direction of drilling with liquid/gas jet to reduce construction costs and ensure construction safety.
Inactive Publication Date: 2009-09-30
SOUTHWEST PETROLEUM UNIV
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[0004] In order to control the erosion of the downhole drilling tool 6 and the wellhead blowout preventer assembly 5 caused by the high-speed gas-solid two-phase flow during the gas drilling process, the present invention provides a gas drilling erosion reduction system
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[0010] The present invention will be further described below in conjunction with accompanying drawing.
[0011] exist figure 1 Among them, since the gas-solid two-phase fluid returned from the wellbore annulus 8 passes through the pressure-reducing nozzle 1 at the inlet end 3 of the sand discharge pipeline, a pressure drop will be generated, and this pressure drop is the back pressure value that needs to be controlled by the annulus wellhead 7, The back pressure value can be calculated under the given gas injection pressure and displacement by using the gas drilling erosion reduction back pressure control analysis software. According to this back pressure value, the installation interval between the combination of pressure-reducing nozzles 1 and the combination of recommended pressure-reducing nozzles 1 that can control the wellhead back pressure at 0.1 MPa above and below the back pressure value under the injection pressure and displacement is preferred, so that high-speed W...
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The invention relates to an erosion reducing system for gas drilling, which belongs to the technical field of the gas drilling of oil and natural gas. The erosion reducing system applies a gas drilling erosion mechanism and a back pressure control technique; on the basis of a well control device of the conventional gas drilling, an improved sand draining pipeline, a depressurization nozzle and gas drilling erosion-reducing back-pressure control analysis software are added to the system; and the software is used for calculating the back pressure value required by the erosion reduction under the given injection pressure and delivery capacity and recommending a reasonable depressurization nozzle combination for generating the back pressure value, and the nozzle combination recommended by the software is mounted at the inlet end of the sand draining pipeline to control the back pressure at the mouth of a well, wherein the back pressure value can reduce the erosion effect of high-speed gas-solid two-phase flow to an underground drilling tool and a device at the mouth of the well while the rock-carrying capacity of annulus gas is ensured.
Description
technical field [0001] The invention relates to an erosion reduction system for gas drilling, which reduces the erosion of gas on the combination of downhole drilling tools and wellhead blowout preventers by controlling the wellhead back pressure, and belongs to the technical field of oil and natural gas gas drilling. Background technique [0002] Gas drilling is a drilling operation that uses gas instead of drilling fluid as the circulating flow medium. Gas has the characteristics of low density, low viscosity, and low pressure on the wellbore. The advantages of gas drilling are: high drilling efficiency, effective protection of oil and gas layers, prevention of lost circulation and stuck pipe. Gas drilling can also effectively overcome downhole complex situations such as lost circulation and shale collapse. However, there are still a series of problems in the application process of gas drilling: 1. Due to the lack of lubrication of drilling fluid in gas drilling, the eros...
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IPC IPC(8): E21B7/18
Inventor 李黔江川梁海波
Owner SOUTHWEST PETROLEUM UNIV