Volume fracturing method for activating natural fractures on large scale
A natural fracture and volume fracturing technology, which is applied in the field of oil drilling, can solve the problems that the expected effect of volume fracturing is not achieved and the complexity of fractures is not high enough.
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Embodiment 1
[0091] For a shale gas well, the steps and results are as follows:
[0092] 1. Firstly, the key reservoir parameters of the well were evaluated based on geological, seismic and logging data, and the locations of geological engineering sweet spots and segment clusters were determined.
[0093] 2. Using ECLIPSE and MEYER software to optimize the fracturing fracture length, fracturing scale and number of fracturing stages, etc., according to the optimization results, the fracturing stage is divided into 18 stages, and the amount of fracturing fluid in a single stage is 1800m 3 , a single-stage propping dose of 70m 3 .
[0094] 3. According to the specific implementation step 6 in the invention, the acid type and formula are optimized, and injected according to the corresponding displacement.
[0095] 4, adopt the low-viscosity slippery water of viscosity 1.5mPa.s, liquid volume generally accounts for 25% of the total liquid volume that the invention implements step 4) optimizes, ...
Embodiment 2
[0108] For a shale gas well, the steps and results are as follows:
[0109] 1. Firstly, the key reservoir parameters of the well were evaluated based on geological, seismic and logging data, and the locations of geological engineering sweet spots and segment clusters were determined.
[0110] 2. Using ECLIPSE and MEYER software to optimize the fracturing fracture length, fracturing scale and number of fracturing stages, etc., according to the optimization results, the fracturing stage is divided into 18 stages, and the amount of fracturing fluid in a single stage is 1800m 3 , the propping dose of a single section is 65m 3 .
[0111] 3. According to the specific implementation step 6 in the invention, the acid type and formula are optimized, and injected according to the corresponding displacement.
[0112] 4, adopt the low-viscosity slippery water of viscosity 1.5mPa.s, liquid quantity generally accounts for 30% of the total liquid quantity that the invention implements step...
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