大牛地气田DK13井区井网适应性评价

Evaluation of well pattern adaptability for wellblock DK13 of Daniudi gas field

DK13井区是大牛地气田的主力产区,目前部分气井已进入递减期,因此对该井区开展了井网适应性研究。根据目标区动静态资料,建立产量劈分模型,确定储量采出程度,分析储量波及状况;运用试井解释、动态分析等方法开展合理井网井距研究。研究表明,目标区井网整体部署较为合理,局部位置还存在调整空间;预计通过加密、补孔、井筒治理和增压,可新增产能2870×104 m3,提高采收率8%左右。

Wellblock DK13 is the main production area with high productivity in Daniudi gas field.The fact that part of wells in it has being in decline period will affects the production plateau of the gas field.Therefore through the investigation on well pattern adaptability,the study can be carried out on optimization the rational spacing between wells and the well pattern infill or adjustment which will contribute to prolong the production plateau and enhance gas recovery.According to the dynamic and static data of the research area,the model can be established for determining the ratio of the gas output of every layer to the total gas output,and thereby the degree of reserve recovery can be acquired.Then based on the research of swept degree of gas reservoir reserve with the method of dynamic analysis and numerical simulation,the evaluation of well pattern adaptability can be developed by the method of well test analysis,dynamic analysis and theoretical derivation,Eventually analyze the exploitation potentiality and propose adjustment program according to the evaluation of well pattern adaptability and analysis of the remaining gas distribution characteristics.It was concluded that the well pattern was reasonable on the whole and could be adjusted in local area.Moreover,it was predicted that the producibility would be increased by 28.7 million cubic meters and the reserve recovery would be enhanced by about 8 percent through well pattern infill,perforation adding,wellbore harness and pressure boost.