薄差层极限注采井距求解新方法探讨  

New Solution to Critical Injector-Producer Spacing for Thin and Poor Reservoirs

作　　者：刘义坤[1] 唐慧敏[1] 梁爽[1] 王永平[1] 汪金明 

机构地区：[1]提高油气采收率教育部重点实验室东北石油大学,黑龙江大庆163318 [2]中海油(中国)有限公司,广东湛江524000

出　　处：《特种油气藏》2014年第3期75-78,154,共4页Special Oil & Gas Reservoirs

基　　金：国家重大专项"大庆长垣特高含水油田水驱开发效果评价及优化方法研究"(2011ZX05052-12);国家重大专项"薄差油层动用条件及层系井网优化研究"(2011ZX05010-002-05);研究生创新基金"大庆长垣特高含水油田措施优化方法研究"(YJSCX2012-050HLJ)

摘　　要：针对薄差层注采井距不合理与储层动用程度低的问题,根据低渗透油藏五点井网注水开发特点,利用面积波及效率公式计算薄差层二次加密井网2套开发层系面积波及效率;运用多元线性回归,拟合面积波及效率数学模型,计算不同注采压差下极限注采井距;利用有效动用系数计算极限注采井距。对比2种方法计算结果,误差在5%以内,证明利用面积波及效率数学模型对极限注采井距求解的正确性,该结果可用于调整薄差层注采井距,改善薄差层开采效果。In view of the improper injector-producer spacing and low producing degree of thin and poor reservoirs,according to water flooding characteristics of low permeability reservoirs with 5 spot well pattern,areal sweeping efficiency formula was adopted to calculate the areal sweeping efficiency for 2 sets of development strata in the 2nd infilling well pattern for the thin and poor reservoir;multiple linear regression was used to fit the mathematic model of areal sweeping efficiency,which was then used to work out the critical injector producer spacing under different injection-production pressure difference. Meanwhile,effective drainage factor was used to calculate critical injector producer spacing too. Comparison of the results from the two methods shows the error is less than5%,proving that it is proper to calculate critical injector producer spacing with mathematical model of areal sweeping efficiency.The results can be used to adjust the injector producer spacing of thin and poor reservoirs and improve production efficiency of thin and poor reservoirs.

关 键 词：薄差储层 极限注采井距 面积波及效率 有效动用系数 大庆油田 

分 类 号：TE349[石油与天然气工程—油气田开发工程]