基于地层测试的冀东油田钻井液体系合理性评价  

Rationality evaluation method of Jidong oilfield drilling fluid system based on well testing

作　　者：李申达 张亚明 王永军 史文奇 任斌斌 史琪琪 LI Shenda;ZHANG Yaming;WANG Yongjun;SHI Wenqi;REN Binbin;SHI Qiqi(Exploration Development and Construction Engineering Division of PetroChina Jidong Oilfield Company,Tangshan,Hebei 063200,China;Well Testing Branch,CNPC Bohai Drilling Engineering Company Limited,Langfang,Hebei 065007,China)

机构地区：[1]中国石油集团冀东油田公司勘探开发建设工程事业部,河北唐山063200 [2]中国石油集团渤海钻探工程有限公司油气井测试分公司,河北廊坊065007

出　　处：《油气井测试》2023年第1期63-68,共6页Well Testing

摘　　要：对于污染率较高的冀东油田来说,确定储层污染的影响因子及条件对后续选择钻井液及钻井方式具有重要作用。通过表皮系数分解方法,将总表皮系数分为部分打开地层表皮系数、射孔密度表皮系数、高速湍流表皮系数及泥浆污染表皮系数四个组成部分,根据各部分分值大小判断导致冀东油田污染的主要原因为钻井液泥浆污染。经过归纳总结,分析泥浆污染表皮系数与钻井液密度、地层压力、泥浆浸泡时间等因素的关系,得到冀东油田五大钻井液体系污染储层的关系图版,可提前判断储层污染程度。经冀东油田2口井应用抗高温钻井液体系图版,判断NP203X33井储层属于无污染范畴,NP207X3井储层属于污染范畴,与实际双对数-导数诊断曲线验证结果一致。该方法为油田开发中钻井液体系是否合理提供了新的思路和方法,具有一定指导和借鉴意义。Reservoir pollution is an important factor affecting the production of oil and gas reservoirs.For Jidong Oilfield with high pollution rate,determining the influencing factors and conditions of reservoir pollution is of great importance for the subsequent selection of drilling fluids and drilling methods.In this paper,based on the total skin coefficient obtained from formation test data,the total skin coefficient is divided into four parts by the method of skin coefficient decomposition,including the skin coefficient of partially open formation,the skin coefficient of perforation density,the skin coefficient of high-speed turbulence and the skin coefficient of mud pollution.According to the values of the four parts,it is determined that the main cause of pollution in Jidong oilfield is the pollution of drilling mud.By summarizing and analyzing the relationship between mud pollution skin factor and drilling fluid density,formation pressure,mud soaking time and other factors,the relationship chart of five major drilling fluid systems polluted reservoirs in Jidong oilfield is obtained,according to which the degree of reservoir pollution can be judged in advance.Based on this study,whether there is pollution in two Wells in Jidong oilfield under the condition of high-temperature resistant drilling fluid system is judged,and the results are consistent with the actual formation test data,which confirms the accuracy of the relationship chart.The research results of this paper provide a new idea and method for whether drilling fluid system is reasonable in oilfield development,which has certain guidance and reference significance.

关 键 词：冀东油田 泥浆污染 地层测试 表皮系数 钻井液体系 关系图版 

分 类 号：TE254[石油与天然气工程—油气井工程]