1. 煤炭地下气化注入井压力控制.
- Author
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张友军, 杨鹏飞, 刘家炜, 毛良杰, 袁进平, and 付燈煌
- Abstract
Underground coal gasification has the advantages of clean utilization of coal and low carbon energy guarantee, and it is the strategic direction of clean coal transformation technology innovation. Pressure is an important factor affecting coal gasification. In order to make coal gasification underground efficiently and safely, it is necessary to control the pressure of injection wells. In order to control the injection well pressure, the flow pressure simulation model of gasifier injection was established, and the influence factors of hydraulic friction were analyzed, and the production parameters were adjusted to study the pressure control. The results show these as follows. The hydraulic friction decreased with the increase of wellbore diameter. The hydraulic friction increases with the increase of coiled tubing diameter. The hydraulic friction increases with the increase of water injection discharge. Under the injection pressure of 10 MPa, the bottom hole pressure decreased from 7. 26 MPa to 6. 11 MPa when the injection displacement of water in the adjusted annulus was changed from 5. 50 L / s to 5. 75 L / s. Under 8 MPa injection pressure, the bottom hole pressure decreased from 8. 91 MPa to 8. 87 MPa when the oxygen injection in coiled tube was adjusted from 594. 44 L / s to 629. 37 L / s. Under the injection pressure of 8 MPa, the bottom hole pressure is reduced from 8. 94 MPa to 8. 63 MPa when the output flow of crude gas is adjusted from 800 L / s to 900 L / s. The research results can provide some guidance for pressure control of injection well. [ABSTRACT FROM AUTHOR]
- Published
- 2023