摘要
南黄海盆地是是中国四大海域目前唯一未见油气重大发现的海域,勘探程度非常低,截至目前已钻井近30井,多为3 000 m左右的浅井。为进一步探明该海域油气成藏情况,在物探资料的指导下,需在有利位置布置更多的探井。根据已钻井的作业提示,该海域上部为陆相构造沉积,下部为海相构造沉积,地质沉积和板块运动造成了较多的钻井地质风险,包括井下漏失、井壁垮塌、异常压力和H2S等风险。前期已钻井中,已出现了相应的井下复杂情况,此文主要针对这些地质钻井风险,根据地质沉积的理论研究,对这些地质风险的成因机理进行了探讨,分析了地层漏失的特征及类型、井壁垮塌的机理、异常压力的性质及H2S的形成条件;对照分析结果,根据当前使用的钻井技术手段,提出了后期钻井施工应对措施,为南黄海海域后期勘探作业提供技术保证。
The South Yellow Sea Basin is the only sea area of the four major sea areas in China that has not seen significant oil and gas discoveries at present,and its exploration degree is very low.So far,nearly 30 wells have been drilled,most of them are about 3 000 m,which are shallow wells.In order to further explore the hydrocarbon accumulation situation in this sea area,under the guid-ance of geophysical data,more exploration wells need to be arranged in vantage point.According to the drilling operation,the up-per strata of the sea area is continental tectonic deposit and the lower strata is marine tectonic deposit.Geological deposit and plate movement have caused many drilling geological risks,including downhole leakage,borehole wall collapse,abnormal pressure and H2S.In the early stage of drilling,there have been corresponding downhole complications.In this paper,aiming at these geological risks,according to the theoretical study of geological sedimentation,the causes of these drilling geological risks are discussed,and the characteristics and types of formation leakage,the mechanism of wellbore collapse,the nature of abnormal pressure and the for-mation conditions of H2S are analyzed.Based on the analysis results and the drilling technology currently used,the countermeasures of drilling construction in the later stage are put forward,which can provide technical guarantee for the later exploration operation in the South Yellow Sea.
作者
王孝山
毛祖臣
方华良
侯林秀
WANG Xiaoshan;MAO Zucheng;FANG Hualiang;HOU Linxiu(Sinopec Shanghai Offshore Oil&Gas Company,Shanghai 200120,China)
出处
《海洋石油》
CAS
2019年第3期75-79,共5页
Offshore Oil
关键词
南黄海
井下漏失
井壁垮塌
异常压力
H2S
South Yellow Sea
downhole leakage
wellbore collapse
abnormal pressure
H2S
