High energy pulsed spin plasma perforation method

Abstract

The invention belongs to the field of petroleum engineering, and in particular relates to a high-energy pulsed spin plasma perforation method. After the drilling of the oil and gas well is completed, the high-energy pulsed spin plasma drill bit and the whipstock are lowered through the coiled tubing. After reaching a specific formation, the whipstock anchors the casing, and the plasma drill bit deflects under the guidance of the whipstock. One side of the casing; the ground control system sends a control signal, and the plasma drill ejects pulsed spin plasma; the spin plasma melts the casing, annular cement and formation rock in turn; the plasma jet gap, high-pressure spin The air flow is ejected from the plasma nozzle, and the high-pressure spin air flow blows away the molten material in the plasma action area; the spin plasma is repeatedly sprayed, and a high-permeability hole is gradually drilled on the side wall of the wellbore. The method can quickly drill a large-diameter, long-depth high-permeability hole on the side wall of the wellbore, greatly improving the connectivity between the wellbore and the reservoir, and improving the production efficiency and total output of the oil and gas well.

Description

Technical field [0001] The present invention belongs to the field of petroleum engineering, specifically, relates to a high-energy pulsed spin plasma perforation method. Background [0002] In the process of oil and gas exploitation, after the completion of oil and gas well drilling, it is also necessary to use the concentrated energy perforation projectile for perforation operations, open the channel between the wellbore and the reservoir, so that oil and gas resources can enter the wellbore through the channel, and then be exploited to the surface. However, the existing perforation projectile perforation operation has the following deficiencies: the depth of injection into the formation is limited, usually only 0.5 to 1.5m, the diameter is 10 to 15mm, can not effectively penetrate the near well pollution zone; in the process of perforation, there is a compaction effect, resulting in a decrease in the permeability of the rock; the decline in rock permeability directly leads to t...

AI Technical Summary

Problems solved by technology

However, the existing perforating bullets have the following disadvantages: the depth of injection into the formation is limited, usually only 0.5-1.5m deep, and the diameter is 10-15mm, which cannot effectively penetrate the near-wellbore contamination zone; during the perforation process, there is pressure The real effect causes the permeability of the rock to decrease; the decrease of the permeability of the rock directly leads to the decrease of the connectivity between the reservoir and the wellbore, which reduces the production and production efficiency of oil and gas wells; therefore, it is necessary to develop a new type of perforation technology to increase the connectivity between the reservoir and the wellbore. The connectivity of the wellbore improves the production efficiency of oil and gas wells

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