Seam-following hole finding method

Abstract

The invention discloses a seam following hole finding method which comprises the steps that a well position is arranged in a reservoir, and a shaft is arranged in the well position; injecting acid liquor along the shaft, wherein the pressure value of the acid liquor at the bottom outlet of the shaft is between the formation pore pressure value at the bottom outlet of the shaft and the formation fracture pressure value at the bottom outlet of the shaft; the acid liquid flows out from an outlet in the bottom of the shaft, penetrates through natural cracks with opening degrees in different directions and communicates with a plurality of karst caves which are communicated with the natural cracks in different directions. The inventor puts forward a seam following and hole finding transformation idea for the first time, the pressure value of acid liquor at the bottom outlet of the shaft is limited to be between the formation pore pressure value at the bottom outlet of the shaft and the formation fracture pressure value at the bottom outlet of the shaft, it can be guaranteed that the acid liquor flows in a low-pressure seepage mode, and the natural crack utilization rate can be increased; the capacity of natural fractures for communicating fracture-cavity reservoirs is improved, meanwhile, the construction risk and cost in the deep or ultra-deep carbonate reservoir transformation process are reduced, and the yield of oil and gas fields is increased.

Description

technical field [0001] The invention relates to the technical field of oil and gas field development, in particular to a method for finding holes along cracks. Background technique [0002] Among the proven oil and gas reserves in the world, 60% are marine carbonate reservoirs. Carbonate reservoirs have become an important field of oil and gas exploration and development. Carbonate oil and gas reservoirs in my country are widely distributed and have great potential for exploration and development. Within a certain range around the fractured-cavity carbonate wellbore, fractured-cavity reservoirs are developed, and fractures and cavities are distributed in all directions. Most of the oil and gas is stored in the fractures and caves, and it is necessary to realize the connection between the wellbore and the fractures and caves in all directions to increase the production. For deep or ultra-deep carbonate wells with developed natural fractures, traditional acidizing and acid ...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for finding holes along fractures, which solves the problems of low utilization rate of natural fractures and poor ability of artificial fractures to communicate with fracture-cave reservoirs in the prior art

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