Reservoir stratum transformation method for cleaning steering material blocking shot hole temporarily to form fracture net

Abstract

The invention provides a reservoir stratum transformation method for cleaning steering material blocking a shot hole temporarily to form a fracture net. The reservoir stratum transformation method for the cleaning steering material blocking the shot hole temporarily to form the fracture net comprises the following steps that 1 fracturing fluid is injected into stratum; 2 active fluid is injected into the stratum; 3 acid liquor or the fracturing fluid is injected into the stratum; 4 carrying fluid containing with cleaning steering material fluid is injected into the stratum, and an artificial fracture fractured in the step 1 is blocked temporarily; 5 the carrying fluid containing with the cleaning steering material fluid is injected into the stratum, and the shot hole corresponding to the artificial fracture fractured in the step 1 is blocked temporarily; 6 the acid liquor or the fracturing fluid is injected into the stratum; 7 when deep transformation is needed, the steps 3 to 6 are repeated; 8 the fracturing fluid is used for replacing to achieve section fracture net transformation of the reservoir stratum. The reservoir stratum transformation method for the cleaning steering material blocking the shot hole temporarily to form the fracture net has the advantages that the section fracture net transformation can be achieved without a tool, the complexity degree of an underground tool is reduced, the engineering risk is reduced, the working difficulty is reduced, the working period is shortened, and the cost is reduced.

Description

technical field [0001] The invention relates to a reservoir reforming method for temporarily blocking blastholes to form a fracture network by cleaning steering materials, and belongs to the field of petroleum and natural gas exploitation. Background technique [0002] my country is rich in low-permeability oil and gas resources. With the deepening of exploration and development, the proportion of production of low-permeability oil and gas reservoirs has gradually increased. How to realize the efficient development of low-permeability oil and gas reservoirs is very important. Low-permeability oil and gas reservoirs are of poor quality and generally require fracturing or acid fracturing. However, many low-permeability reservoirs are relatively thick, and some oil and gas reservoirs have multiple production layers in the vertical direction with large spans, and the reservoir physical properties and fracture pressures are different. It is difficult to stimulate the entire produ...

AI Technical Summary

Problems solved by technology

[0003] ① The cost of a single segmented tool is high, and the cost of segmental transformation of multi-segment tools is high;

[0004] ② After multiple layered tools are added to the downhole reconstruction tool string, it is difficult to run in and the operation period is long;

[0005] ③Mechanical delamination tools affect the strength of the pipe string, and the engineering risk is high, especially in the construction of deep wells, which may easily lead to the scrapping of oil and gas wells;

[0006] ④Due to technical limitations, the diameter of downhole tool strings with multiple layered tools is greatly reduced, which affects subsequent operations;

[0007] ⑤ The isolation function of the segmentation tool is easy to fail, which will lead to segmentation failure and high risk of effect

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