气藏评价钻探过程中对裂缝性砾岩体储层的保护
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摘要
廊固凹陷大兴探区沙三段深层多套裂缝性碳酸盐岩砾岩体缺乏储层敏感性资料,主产层压力系数低,评价钻探中钻井液漏失等复杂情况时有发生。结合兴9气藏地质特征及近年来的钻井经验,提出采取优化井身结构、加强地震地质结合随钻跟踪,做好裂缝段钻前预测和钻后检测、根据不同目的层段的地质状况采用相应钻井液体系并做好防漏堵漏措施等措施来实现储层保护。现场应用10口井,钻井周期平均降至105 d,单井平均日产气5×104 m3以上,达到了保护裂缝储层、快速评价建产的目的。该方法的成功应用表明,地质随钻分析相结合是解决裂缝性砾岩气井钻探复杂地质问题的关键。
For drilling the deep fractured carbonate conglomerate reservoir of the third section of Shahejie Formation in Daxing exploration zone of Langgu Sag,drilling mud losses can not be avoided,because of the lack of reservoir sensitivity information and the low pressure gradient of main producing formation.Considering Xing 9 reservoir geological characteristics and the drilling experience in recent years,some measures were taken to prevent drilling fluid leaking,as optimizing well scheme,strengthening the integration of seismic material and geological analysis while drilling,predicting fracture distribution before and after drilling,choosing suitable drill-ing fluid system according to different geological conditions,and controlling the slurry solid content.This method led to the success of overall drilling 10 wells,with drilling period down to an average of 105 days,and the average single well daily gas production more than 50,000 cubic meters,which indicated the studied method could protect fractured reservoirs and rapidly build up productivity.The successful application proved that the combination of geological and drilling process analysis is critical to solve complex geological problems in this area.Experiences were accumulated of drilling fractured conglomerate gas wells.
For drilling the deep fractured carbonate conglomerate reservoir of the third section of Shahejie Formation in Daxing exploration zone of Langgu Sag,drilling mud losses can not be avoided,because of the lack of reservoir sensitivity information and the low pressure gradient of main producing formation.Considering Xing 9 reservoir geological characteristics and the drilling experience in recent years,some measures were taken to prevent drilling fluid leaking,as optimizing well scheme,strengthening the integration of seismic material and geological analysis while drilling,predicting fracture distribution before and after drilling,choosing suitable drill-ing fluid system according to different geological conditions,and controlling the slurry solid content.This method led to the success of overall drilling 10 wells,with drilling period down to an average of 105 days,and the average single well daily gas production more than 50,000 cubic meters,which indicated the studied method could protect fractured reservoirs and rapidly build up productivity.The successful application proved that the combination of geological and drilling process analysis is critical to solve complex geological problems in this area.Experiences were accumulated of drilling fractured conglomerate gas wells.
引文
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[7]康毅力,闫丰明,游利军,等.塔河油田缝洞型储层漏失特征及控制技术实践[J].钻井液与完井液,2010,27(1):41-43.
[2]顾军,张玉广,高玉堂,等.裂缝性储层保护技术与钻井完井液[J].油田化学,2007,24(1):87-92.
[3]熊继有,程仲,薛亮,等.随钻防漏堵漏技术的研究与应用进展[J].钻采工艺,2007,30(2):7-10,19.
[4]徐兴华,李前贵.川西裂缝气藏储层保护研究新进展[J].天然气工业,2008,28(9):77-79.
[5]杨枝,孙金声,张洁,等.裂缝性碳酸盐岩储层保护技术研究进展[J].探矿工程:岩土钻掘工程,2009,36(11):4-10.
[6]刘大伟,康毅力,雷鸣,等.裂缝漏失性碳酸盐岩气藏钻井完井损害模式[J].钻采工艺,2009,32(5):9-12.
[7]康毅力,闫丰明,游利军,等.塔河油田缝洞型储层漏失特征及控制技术实践[J].钻井液与完井液,2010,27(1):41-43.
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