为了能够在油气开采过程中对套管的安全状态进行动态监测,以便科学合理地调整开发措施,建立了基于模糊综合评价和动态组合赋权的套管安全可靠性评价模型.通过全面分析影响套管安全可靠性的因素,建立了由钻井、 开采、 应力和地质因素等4个一级、11个二级和15个三级指标组成的套管安全可靠性评价指标体系;根据行业标准和专家意见,建立了可靠性等级划分标准;采用由层次分析法和离差法组成的动态权重计算方法,综合15个评价指标,建立了基于模糊综合评价的套管安全可靠性评价模型,并提出依据边界数据动态划分可靠度等级区间的方法.最后运用该模型对某油田套管的安全可靠性进行评价.研究结果表明,该模型可以在油田开采过程中准确地对套管的可靠性进行评价和动态监测.所建立的评价方法对调整油田开发措施和套管的选用具有指导意义.

介绍了单通道井的特点,基于单通道井对固井水泥浆的要求,开发了适用于单通道井固井用的低黏微膨胀韧性水泥浆体系,室内对水泥浆各项性能进行了试验研究,结果表明:开发的水泥浆体系能够满足单通道井固井的要求,低黏微膨胀韧性水泥浆体系配方(w)为:100％G级水泥+42％ 淡水+7％ 流型调节剂LPG+1％ 膨胀剂PUB+7.5％ 胶乳液+5％ 降失水剂DPT+0.4％ 缓凝剂HP-2+1％ 消泡剂.低黏微膨胀韧性水泥浆体系具有低黏、稳定性好,稠化时间可调,受温度影响较小等优点,能够满足单通道井对固井水泥浆性能的要求.

古潜山内幕油气藏钻井若严格按照海洋过平衡钻井工艺施工,容易发井漏、井塌和井涌等井下复杂情况,并可能对油气层造成严重的表皮伤害.本文以南海海域实施的首口古潜山内幕油气藏A井溢流压井作业实践为例,通过井控作业过程的分析,对该类型油气藏的井控技术进行研究和探索,为后续同类型井井控作业提供参考.

分支井技术作为一种提高采收率及提高油气开采经济效益的技术手段,已被广泛应用到海上油气田开发.针对LH4-1油田油藏地质情况及原油物性特点,为更大限度提高单井产能和经济效益,LH4 l油田开发设计一口水下双分支水平井,该井是国内海上油田开发中首次采用空心斜向器开窗及定方位射孔工艺技术钻水下双分支水平井.主要包括井身结构设计优化、分支井连接交叉处的处理工艺、定向钻具组合选择与井眼轨迹控制技术、空心斜向器定方位射孔工艺技术等,可为今后国内海上油田实施和推广水下双分支井技术提供借鉴.

分支井技术作为一种提高采收率及提高油气开采经济效益的技术手段,已被广泛应用到海上油气田开发.针对流花4-1油田油藏地质情况及原油物性特点,为更大限度提高单井产能和经济效益,在水平井基础上布置一口水平分支井.两分支垂深相差2 m,a分支水平产层段长781 m,b分支水平产层段长1311 m.文章主要分析该双分支井施工难点,重点介绍了双分支井钻井工艺技术,主要包括井身结构设计及优化、套管开窗技术、钻头及钻具组合设计及优化、钻井液设计等,可为今后国内海上油田实施和推广双分支井技术提供借鉴.

In the deepwater drilling, affected by the deepwater section, the overburden pressure is low and the drilling lfuid density window is narrow, so higher requirements are raised for the prediction precision of kick tolerance. The kick tolerance is affected by multiple factors, such as kick strength, casing shoe bearing capacity, and intrusive lfuid property, and should meet the requirement of safe well killing under the most dangerous working conditions. After the calculation and analysis of deepwater wells in the South China Sea, the effects law of different factors on kick tolerance is ifgured out, and the notices in kick tolerance analysis of deepwater drilling are raised, so as to provide a reference basis for the deepwater drilling design and site operation. According to the research results, in the deepwater drilling, the different factors effects on the kick tolerance should be fully considered. In particular, in the narrow density window, the calculation precision will affect the wellbore structure and casing lowering depth.

During drilling operation of the first independently operated deep water oilfield—LH4-1Oilfield,precise positioning of underwater wellhead and precise control of the permanent guide base azimuth were needed.In order to meet this requirement,underwater GPS positioning technique was adopted,which combines water sonic and GPS positioning.long base line system and GPS positioning system were selected in the underwater positioning operation of LH4-1through the comparison among long base line system,short base line system and ultra short base line system.Detailed precise positioning procedure with the support of underwater wireless gyro and remote operated vehicle were set up.In the positioning application in LH4-1Oilfield development,all the requirements of precise positioning and azimuth control were satisfied.

减小井距可节约工程费用,但会引起群桩效应而导致拒锤现象发生.根据室内试验研究和理论分析,提出了群桩作用下钻井隔水导管入泥深度的计算方法.该计算方法已在我国海上陆丰13-2油田等多个油(气)田进行了应用,取得了非常好的效果.群桩作用下钻井隔水导管入泥深度计算方法在提高海上作业速度、保证海上作业安全和降低油田勘探开发成本方面有着重要意义.

根据喷射导管施工工艺和土力学分析,建立了喷射导管极限承载力和实时承载力计算模型,根据海上钻井导管几何物理参数和井口载荷,确定了导管最小入泥深度计算模型.结合流花4-1油田海底土质参数和实际作业载荷,对30和36英寸钻井导管最小入泥深度进行了分析.

针对海上钻井导管下入施工实际情况,采用 API 规范建立了钻井导管极限承载力计算模型.根据流花4-1油田井场调查土质参数,建立了30英寸和36英寸钻井导管极限承载力曲线,确保了海上钻完井作业的安全性.