川西须家河组气藏气井采气新技术探索

针对川西须家河组气藏埋藏深、裂缝发育、含CO₂、采气过程中见水快和采气管柱易腐蚀的生产难题，从地层流体流动能力随压差增大而增加、管柱腐蚀随CO₂分压增高而加剧出发，提出在采气过程中，运用临界产量（最大生产压差）配产，延长无水采气期；采用井下节流技术降低采气管柱CO₂分压，降低油管腐蚀速率。二者结合既能合理配产，延长气井污水采气时间，也能从工程上保证控制生产压差和降低井筒CO₂分压的实现，从而达到提高气井生产效率的目的。

A PROBE INTO THE NEW TECHNOLOGY OF GAS PRODUCTION OF XUJIAHE GAS RESERVOIR IN WEST SICHUAN

Aiming at such production difficulties as deeply buried gas reservoirs，developed fractures，containing CO₂，quick waterproducing in gas production and the production pipe string corrosion in Xujiahe reservoirs，west Sichuan，based on the factors that flow ability of formation fluid increase as the pressure difference increases，pipe string corrosion gets more severe as CO₂ fractional pressure goes up，it is presented that in gas production，the critical productivity(maximum production pressure difference)can be used in proration to prolong the period of gas production without water，the down hole throttle technique used to decrease CO₂ fractional pressure in gas production pipe string and the rate of the corrosion.The combination of the two ways can make both the proration reasonable，prolong the period of gas production without water，and ensure the control of production pressure difference,as well as decrease CO₂ fractional pressure in well bore,the production efficiency will be increased.