A method for drilling, completion and stimulation of fishbone-shaped multi-level branched horizontal wells in shale gas reservoirs

Abstract

The invention discloses a drilling and completion and production increasing method for a shale gas reservoir of a multilateral fishbone horizontal well. The method comprises the steps of S1, designing the whole body of the multilateral fishbone well; S2, drilling the multilateral fishbone well by the matching of a continuous pipe and a drilling robot; S2, cementing the bottom of the multilateral fishbone well or directly completing with barefoot well; S4, mounting a quickly-cured liquid explosive thin-wall pipe cavity on the drilling robot, feeding to reach the bottom part of the multilateral fishbone well by the matching of the continuous oil pipe and the drilling robot, spraying the quickly-cured liquid explosive, and preparing for blasting; S5, moving out the continuous oil pipe and other auxiliary tools, and detonating the explosive at the bottom of the well, so as to achieve the reconstruction and production increase of the shale; S6, stably producing in later period. The method has the beneficial effects that the shale gas can be efficiently safely produced with low cost in a green manner; the shortages of large water and sand consumption in large-scale fracturing at the long horizontal well sections, high water pollution risk, long construction period, and failure of pressing and opening deep shale can be avoided.

Description

technical field [0001] The invention relates to the technical field of development of unconventional oil and gas resources, in particular to a method for drilling fishbone-shaped multi-level branched horizontal well shale gas reservoirs for drilling, completion and production stimulation. Background technique [0002] With the sustained and rapid development of my country's national economy, the contradiction between energy supply and demand has become increasingly prominent. In 2013, my country imported 285 million tons of crude oil, becoming the world's second largest importer of crude oil. The degree of dependence on foreign countries has approached 60%, approaching or exceeding the internationally recognized energy security line. Therefore, while intensifying the exploration and development of new fields in new oil and gas areas, searching for new alternative energy sources has become an important strategic measure to ensure national energy security and national security....

AI Technical Summary

Problems solved by technology

As the water used for drilling and fracking development is injected into shale formations, much deeper than aquifers, it is mostly absorbed by the rock and cannot be recycled

The development of shale gas resources in my country is facing the problems of water shortage and high cost, which seriously restricts the development of shale gas industry

[0006] (2) The development of deep shale gas reservoirs is difficult, and the requirements for fracturing operation parameters are difficult to meet

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