Shale gas horizontal well full-life-cycle drainage and gas production integrated string and construction method

Abstract

The invention provides a shale gas horizontal well full-life-cycle drainage and gas production integrated string and a construction method. The string comprises an oil pipe, a casing pipe and a tail pipe, the top end of the oil pipe is hung in the casing pipe through an oil pipe hanger, a plurality of eccentric gas lift valves are arranged on the oil pipe at intervals, and the lower middle portionof the oil pipe is connected with a plunger limiting short section. The bottom end of the oil pipe is connected with the top of a direct-circulation injection pump, the bottom of the direct-circulation injection pump is connected with the top end of the tail pipe, the casing pipe sleeves the oil pipe and the tail pipe and is centrally aligned, and a packer is arranged in an annulus, correspondingto the casing pipe, of the upper portion of the tail pipe. Gas well drainage and gas production processes of optimized strings, gas lift valves and plungers are integrated, process switching and connection are completed through one string, and the high-yield liquid whole-well life-cycle drainage and gas production technology can be achieved.

Description

Technical field [0001] The invention belongs to the technical field of petroleum and natural gas, and in particular relates to a shale gas horizontal well full life cycle drainage and gas production integrated pipe string and a construction method. Background technique [0002] With the continuous expansion of shale gas development areas, atmospheric shale gas reservoirs have become a new research direction. Atmospheric gas reservoirs generally have the characteristics of large flowback fluid volume, low formation pressure, and the fracturing fluid is difficult to effectively discharge by the formation energy. The fluid accumulation in the wellbore is difficult to be discharged by the formation's own energy, and normal discharge testing or production cannot be carried out. At present, the development of such atmospheric gas reservoirs at home and abroad mainly uses electric submersible pumps, jet pumps, and gas lift valves for forced drainage. However, it has also been found that...

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Problems solved by technology

Atmospheric pressure gas reservoirs generally have the characteristics of large flowback fluid volume, low formation pressure, and difficulty in effectively discharging fracturing fluid by relying on formation energy. The fluid accumulated in the wellbore is difficult to discharge by relying on the formation's own energy, and normal blowout testing or production cannot be performed.

At present, the development of this kind of atmospheric gas reservoirs at home and abroad mainly uses electric submersible pumps, jet pumps, and gas lift valves to carry out forced drainage. A certain stage cannot run through the whole life cycle of the gas well

At present, although some progress and achievements have been made in the research on the drainage technology of atmospheric shale gas, it is still limited to a certain technology, and its limitations will gradually be exposed with the prolongation of the mining time

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