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首页> 外文会议>Proceedings of The 39th IPA convention and exhibition-Working together to accelerate solutions in anticipating indonesia's energy crisis >DE-RISK DRILLING HIGHLY UNSTABLE OVERBURDEN SECTION OF DEEP WATER PROSPECTS IN THE MADURA-FLORES SUB-BASIN: AN APPLICATION OF BASIN-SCALE OVERPRESSURE MODELLING FROM 3D NUMERICAL SIMULATION OF SEDIMENTCOMPACTION AND FORMATION WATER FLOW
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DE-RISK DRILLING HIGHLY UNSTABLE OVERBURDEN SECTION OF DEEP WATER PROSPECTS IN THE MADURA-FLORES SUB-BASIN: AN APPLICATION OF BASIN-SCALE OVERPRESSURE MODELLING FROM 3D NUMERICAL SIMULATION OF SEDIMENTCOMPACTION AND FORMATION WATER FLOW

机译：玛杜拉-弗洛里斯盆地深水区高风险的超突突断面钻探：沉积物 r n压实和地层水流的3D数值模拟盆地规模超压模型的应用

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Exploration wells drilled in the Madura-Flores Sub-rnBasin frequently experience borehole instability andrnloss of circulation. These drilling hazards arernprimarily restricted to the shaly overburden sectionrnoverlying the Oligo-Miocene carbonates play. Theyrnare interpreted to be the result of abnormal pressurernregimes of the formation water along withrnmechanical instability of the shales, which result inrnnarrow effective stress windows. In this context, wellrndesign of deepwater exploration wells proves itself arnperilous exercise, and the risks of escalating wellrnconstruction costs and loss of drilling time during thernoperations are relatively high. To minimize thesernexposures, the development of wellbore stabilityrnmodels is essential to determine the critical mudrnweights that can provide the support to the wellborernwall without invading the formations. Pore pressurernconstitutes one of the key parameters of these modelsrnand its accurate prediction in abnormal pressurernregimes remains decisive in the forecast capabilitiesrnof the model.rnA pore pressure cube of part of the Madura-FloresrnSub-Basin was established using basin modellingrntechniques. Basin modelling provides morernflexibility than traditional quantitative seismicrntomography methods in assessing the impacts on thernpressure regime of events that could be belowrnseismic resolution, especially the up-dip transfer ofrnpressure within permeable beds. The 3D model wasrnsimulated through stratigraphic times in terms ofrnsediment compaction and formation water flow inrnorder to calibrate a series of critical pore pressurernindicators extracted from key wells previouslyrndrilled in the area. The fluid flow simulations used arnmodified Darcy Flow equation integrating buoyancyrnand capillary pressure into a pressure-temperaturern3D finite element solver. Different scenarios ofrnpermeable facies occurrence and distribution, shalerncompaction and permeability reduction, and waterrnsalinity were envisaged in order to capture thernexisting uncertainties in the characterization of thernoverburden section. Pore pressure profiles were thenrnextracted from the 3D pore pressure cubes at thernlocation of selected deep water prospects. ThernMin/Base/Max pore pressure predictions for eachrnprospect location were subsequently used as an inputrninto a wellbore stability model.
机译：在马都拉弗洛雷斯（Madura-Flores）rn-Basin盆地钻探的勘探井经常会出现井眼不稳定和环流损失的情况。这些钻探危害主要限于Oligo-中新世碳酸盐岩所覆盖的页岩覆盖层部分。它们被解释为是地层水压力异常以及页岩的机械不稳定性造成的，从而导致有效应力窗口变窄。在这种情况下，深水勘探井的井眼设计证明了自己的精打细算，并且在井眼作业过程中，井眼建设成本不断攀升和钻井时间损失的风险相对较高。为了最大程度地减少暴露，井筒稳定性模型的开发对于确定可在不侵入地层的情况下为井壁提供支撑的关键泥水重量至关重要。孔隙压力是这些模型的关键参数之一，其在异常压力条件下的准确预测对于该模型的预测能力仍然起着决定性作用。使用盆地建模技术建立了马杜拉-弗洛雷斯纳盆地的部分孔隙压力立方体。与传统的定量地震层析成像方法相比，盆地模拟在评估可能低于地震分辨率的事件对压力状态的影响时，提供了更大的灵活性，尤其是渗透床内压力的上倾传递。通过地层时间模拟了沉积物压实和地层水流向的3D模型，以校准从该地区先前钻探的关键井中提取的一系列关键孔隙压力指标。流体流动模拟使用经过改进的Darcy Flow方程，将浮力和毛细管压力集成到压力-温度-3D有限元求解器中。设想了渗流相发生和分布，页岩压实和渗透率降低以及水盐度的不同场景，以捕获渗流剖面特征中存在的不确定性。然后在选定的深水勘探区位从3D孔隙压力立方体中提取孔隙压力分布图。随后将每个远景位置的最小/基本/最大孔隙压力预测用作井眼稳定性模型的输入。

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