非均质碳酸盐岩油藏水平井分段酸化注酸量优化设计方法  

Optimization design of acid fluid volume of staged acidizing in horizontal wells for heterogeneous carbonate reservoir

作　　者：付宣 李根生[1] 崔明月[2] 黄中伟[1] 蔡承政[1] 

机构地区：[1]中国石油大学(北京)油气资源与探测国家重点实验室,北京102249 [2]中国石油勘探开发研究院廊坊分院,河北廊坊065007

出　　处：《油气地质与采收率》2015年第6期112-115,120,共5页Petroleum Geology and Recovery Efficiency

基　　金：国家自然基金创新群体项目"复杂油气井钻井与完井基础研究"(51221003);中国石油集团公司"十二五"海外重大科技攻关项目"中东地区大型碳酸盐岩油藏采油工程技术研究与应用"(2011E-2502)

摘　　要：对非均质碳酸盐岩油藏水平井进行分段酸化改造时,需充分考虑水平井渗透率非均质特性,准确评估各段伤害带半径和伤害带渗透率,以便合理设计各段注酸量。在考虑了钻井过程中井底压差、钻井液浸泡时间和渗透率分布等因素的基础上,利用达西定律推导了各段伤害带半径的计算模型;提出了基于油藏井筒耦合模型与现场实测的产液剖面来计算各段伤害带渗透率的新方法;通过现场1口实际井详细描述了基于上述模型的非均质碳酸盐岩油藏水平井分段酸化注酸量的优化设计流程。考虑水平井渗透率非均质性并结合现场实测生产数据,相比于传统的基于椭圆锥台体伤害带分布模型进行的笼统化布酸模式,新的设计思路提高了各段布酸的合理性,可有效解除储层污染、恢复油井产能。In order to reasonably allocate the acid fluid volume for staged acidizing in a horizontal well for heterogeneous carbonate reservoir,it is crucial to fully consider the permeability heterogeneity along the wellbore and to accurately evaluate the damage radius and damage permeability of each segment. Based on the Darcy's law,a model of damage radius was deduced with consideration of drilling bottom-hole pressure difference,soak period of drilling mud and permeability distribution. Based on reservoir-wellbore coupling model and tested inflow profile,a new approach of calculating damage permeability distribution was proposed. The process of acid fluid volume optimization for heterogeneous carbonate reservoir was illustrated by a case study on real well data. Since the influence of the permeability heterogeneity and the real production data is fully considered,the proposed design procedure can improve the reasonability of acid fluid volume allocation along the horizontal well,remove the formation pollution effectively and restore oil well productivity compared to the traditional non-specific acid allocation pattern which is based on the elliptic cone damage zone model.

关 键 词：非均质 碳酸盐岩 水平井 分段酸化 注酸量 

分 类 号：TE357.2[石油与天然气工程—油气田开发工程]