Project introduction: With the improvement of oil exploration and development in my country, the proportion of reserves in low-permeability oilfields is increasing. In the current situation of tight reserve reserves, better development of low-permeability oilfield reserves is of great practical significance to the sustainable and stable development of my country's petroleum industry. In order to increase the oil well production of low-permeability oil and gas reservoirs, high-pressure water-based fracturing fluid gel containing proppant can be injected into the oil well. Under high pressure, the oil-bearing rock formation will be fractured to create gaps. The fracturing fluid gel carries the proppant into the fractures to support it, and then the oil well is closed to crack the fracturing fluid gel under the action of the gel breaker. Then the cracked fracturing fluid is discharged back from the well. Due to the presence of proppant, cracks with good conductivity are formed in the oil layer. This will help increase oil well production.
Main features: This project isolated a thermophilic bacterium from soil and cloned it to obtain a highly active thermophilic mannanase. The half-life of the enzyme at 80℃ is 46 hours. Commodification of imports
Compared with the high-temperature resistant biological enzyme breaker Pyrolase®160, our mannanase has the outstanding advantages of good breaking activity at high temperatures and low breaking activity at room temperature (less than 5% of that in an 80℃ environment). This can effectively prevent the gel of the prepared water-based fracturing fluid from breaking prematurely before reaching the predetermined position, reducing the fracturing effect.
Technical level: The technology is at the leading level in China.
Application prospects: At present, the proportion of reserves in domestic low-permeability oilfields has reached more than 60%. Applying the high-temperature resistant biological gel breaker enzyme preparation we developed to the development of domestic high-temperature and low-permeability oilfields will have good increase production effects and economic benefits.
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