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[摘要]對XXX盆地南部XXX北區(qū)塊進行了深煤層注入地質和工程評價，認為XXX北區(qū)塊適合進行深煤層注入CO2開采煤層氣技術的應用；通過SX-001井的微型先導性試驗，對SX-001井的注入前后產氣量與產水量、氣體成分變化和井底壓力變化規(guī)律進行了總結。通過現場試驗，注入CO2后SX-001井的產氣量是注入前的2.45倍；在小于煤巖破裂壓力的條件下，每天注入20 t的CO2能夠實現順利注入，并且壓力上升速度較慢；注入CO2后，煤巖發(fā)生膨脹，局部煤層的滲透率降低，排采一段時間后恢復；在目的煤層中注入的CO2的影響范圍內，烴類氣體總的置換效率達到14.18 cm3/g。該試驗成果證明XXX北區(qū)塊通過注入CO2開采煤層氣實現了CO2的埋藏，提高了煤層氣井的采收率。
[Abstract] By conducting geological and engineering evaluation on CO2 injection into deep coalbed at XXX North Block of Southern XXX Basin, we think that it’s feasible to inject CO2 into deep coalbed at XXX North Block for coalbed methane production; with micro-pilot tests on Well SX-001, we are able to conclude how gas production, water production, gas composition and well bottom pressure change before and after CO2 injection into Well SX-001. Field tests show that gas production of Well SX-001 after CO2 injection is 2.45 times of before; when the pressure is less than fracture pressure of coals, injecting 20 tons of CO2 per day is reasonable and successful, and the pressure rises slowly; coals start to expand after CO2 injection causing penetration rate drops at local coalbed, which is then back to normal after outflow and extraction for a certain amount of time; within the range of influence by injecting CO2 into target coalbed, total displacement efficiency of hydrocarbon gases is up to 14.18 cm3/g. Such results prove that by injecting CO2 at XXX North Block to produce coalbed methane, CO2 burial will be realized, which improves the recovery ratio of coalbed methane wells.

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