阿姆河复杂气藏射孔、酸化、测试联作技术

针对阿姆河高温、高含硫复杂碳酸盐岩气藏A区低压井和B区高压井在作业过程中压井困难、井控风险高、储层二次伤害问题突出、资料录取困难等难题,开展了射孔、酸化、测试联作工艺研究。通过工具优选、工艺优化和现场试验,形成了两套适用于高温、高含硫和不同产量条件下的射孔、酸化、测试联作工艺,即适用于A区储层的低压井三联作工艺管柱(OMNI阀+LPR-N阀+RD阀)和适用于B区储层的高压井三联作工艺管柱(OMNI阀+RDS阀+RD阀)。该联作工艺在阿姆河复杂酸性气藏高、低压储层中共应用41口井,成功率100%,地质资料取全取准率100%,其中20余口井酸化后测试产量超过100×104m3/d,单层射孔、酸化、测试作业时间平均缩短15 d以上,大幅度降低了作业成本、缩短作业周期的同时,大大降低了复杂碳酸盐岩气藏完井作业期间的井控风险,该研究为类似气藏的完井配套工艺提供了技术借鉴。

Application of testing technology in complex gas reservoirs of Amu Darya

High-temperature, high-pressure and high-productivity gas wells in the Amu Darya gas field encountered high well-control risks, difficulties in well killing, secondary pollution of reservoir formation, difficulties in acquisition of data and other challenges during testing operations. Researches have been carried out to improve testing technologies, and modify relevant tools. Through tool selection, process optimization and field test, two sets of integrated perforaion, acidizing and testing processes for high temperature, high sulfur content, and different productivities have been established, namely, OMNI valve + LPR-N valve+ RD valve three in one string for low pressure wells in A block, and OMNI valve+RDS valve+ RD valve three in one string for high pressure wells in B block. The new integrated process has been applied on 41 wells in the Amu Darya Gasfield with a success rate of 100%, and a geologic data acquisition rate of 100%. Among these wells, over 20 had a production of over 100×104 m3/d after acidizing. Compared with conventional technologies, the integrated process can shorten the average perforation, acidizing, and testing time by over 15 days, lowering operation cost and well control risks during the completion of complex carbonate reservoirs substantially. The study provides references for the completion of similar gas reservoirs.