A method of strengthening the hydraulic fracture conductivity of soft coal seam
A technology of hydraulic fracture and flow conductivity, applied in the direction of microorganism-based methods, biochemical equipment and methods, mining fluids, etc., can solve the problems of low mechanical strength of coal body, poor drainage effect, loose coal quality, etc., and achieve technical Easy to improve mechanical strength and reduce clogging effect
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Embodiment 1
[0030] Use distilled water to prepare the medium required for proliferation culture. The components and concentrations of the medium are peptone 5.0g / L, meat extract 3.0g / L, urea 20.0g / L, MnSO 4 ·H 2 O 10mg / L, the prepared culture medium was sterilized by high-temperature steam at 121°C for 20 minutes, and then placed in a sterile operating table to cool for later use. The purchased strains are in the state of freeze-dried powder, which are stored in vacuum in the ampoule, break the ampoule, inoculate the freeze-dried powder into a triangular flask containing 10mL medium for cultivation, place the triangular flask in the incubator, and transfer it to the triangular flask The formation of bacterial colonies in it indicates that the activation is successful. Inoculate the activated bacterial solution into a Erlenmeyer flask containing 100 mL of medium for proliferation and culture.
[0031] Prepare fixative and gelling solution, the fixative is 0.05mol / L CaCl 2 Solution, gel s...
Embodiment 2
[0037] Example 2 differs from Example 1 in that: (1) the concentration of the fixative solution is 0.06 mol / L, and the concentration of the gelling solution is 1.0 mol / L; (2) the pH of the reservoir mixed solution is 9.0, and the DO value is 3 mg / L , the reservoir temperature is 35°C; (3) The process of injecting the gelling solution is intermittent twice.
[0038] After the reservoir stimulation is completed, check the gas content, extraction concentration, flow rate and permeability coefficient through the inspection holes of the direction and tendency of the coalbed methane reservoir.
Embodiment 3
[0040] Embodiment 3 differs from Example 1 in that: (1) medium components and concentrations are respectively peptone 5.5g / L, meat extract 3.5g / L, urea 22g / L, MnSO 4 ·H 2 O 8~12mg / L; (2) The injection speed of the fixative was 18L / min, and the injection speed of the gelling solution was 1.5L / min. After the injection of the gelling solution, there was an interval of 24 hours. The whole injection process was intermittent for 6 times.
[0041] After the reservoir stimulation is completed, check the gas content, extraction concentration, flow rate and permeability coefficient through the inspection holes of the direction and tendency of the coalbed methane reservoir.
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