Well completion method with shale gas layer radial jetting drilling and volume fracturing combined

Abstract

The invention relates to a well completion method with shale gas layer radial jetting drilling and volume fracturing combined. According to the method, a magnetic locating and natural gamma-ray logging method is utilized, and a gyroscope is utilized for measuring a hole drift angle, so that the opening specific direction of a casing pipe is determined; then, a milling bit is utilized for windowing the determined casing pipe, and at least two radial horizontal holes are drilled through high-pressure jet injection; the radial horizontal holes are all located in a target stratum, and are evenly distributed; and finally, fracturing fluid is input to a high-pressure pump, and a rock crack needed by oil and gas transportation is formed. The method has the beneficial effects that the shale gas single-well gas production rate is improved, after-pressure returning and draining and environment protection are facilitated, the single-well work cost and the risks are greatly reduced, and the method has the prominent advantages from the technology, the environment and the economy.

Description

technical field [0001] The invention belongs to the technical field of shale gas exploitation, and in particular relates to a well completion method combining radial jet drilling and volume fracturing in shale gas layers. Background technique [0002] Shale gas is a special unconventional natural gas reservoir, which occurs in organic-rich shale and its interlayers, and is a hydrocarbon gas that mainly exists in the adsorption or free state. The area is characterized by continuous accumulation, low porosity and low permeability. The main component of shale gas is methane, which is similar to conventional natural gas and has the same purpose. [0003] Generally, shale gas has no natural production capacity or low production capacity, and requires large-scale hydraulic fracturing and horizontal well technology for economical production. Compared with conventional natural gas, shale gas development has the advantages of long mining life and long production cycle, but the early...

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Problems solved by technology

Due to the large difference in geological conditions between China and the United States, the cost of shale gas exploitation in China is about 3-5 times that of similar shale gas activities in the United States, resulting in a lack of competitiveness in prices and greater difficulty in commercial development

[0005] At present, the conventional shale gas development and completion method at home and abroad, that is, horizontal wells plus hydraulic fracturing, has the characteristics of multiple operating procedures, long periods, large liquid volume required, difficult flowback, and uncontrollable fracture height and transverse fracture network.

[0006] In the prior art, in the completion stage of shale gas development projects, especially the acid fracturing stage, the investment cost is quite high, but the effect of acid fracturing is still very poor, and the volume of wasted fracturing fluid is very large, and the large volume Acid fracturing has caused serious pollution to oil and gas formations

[0007] In the prior art, the conventional shale gas well completion method is the completion method of horizontal well plus hydraulic fracturing, but the completion method of horizontal well plus hydraulic fracturing has many operating procedures, long period, and the required fracturing fluid The amount of fracturing fluid is huge, and flowback is difficult, and the fracture height and transverse fracture network are uncontrollable technical defects. Also, due to the huge amount of fracturing fluid used, the impact on the environment is great, and the operation risk and cost will increase

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