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首页> 外文会议>Technology advances >Assessing Caprock Integrity for Steam-Assisted Gravity-Drainage Projects in Heavy-Oil Reservoirs (GEM Presentation)
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Assessing Caprock Integrity for Steam-Assisted Gravity-Drainage Projects in Heavy-Oil Reservoirs (GEM Presentation)

机译：评估重油油藏蒸汽辅助重力排水项目的盖层完整性（GEM演示）

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摘要

Thermal recovery processes in heavy-oil reservoirs canrnsometimes compromise caprock integrity, and may also havernother undesirable consequences. For instance, casing failuresrnmay occur if significant strains develop along weakrndiscontinuities in the caprock such as bedding planes, naturalrnor induced fractures, or faults. Likewise, cyclic steamrnstimulation (CSS) operations that use large volumes of highrnpressure, high temperature steam, can breach the caprockrnalong a discontinuity, or perhaps via a poorly-cementedrnwellbore. Steam-assisted gravity-drainage (SAGD) processesrnare run at lower steam pressures and are not usually thought tornpose the same caprock integrity risks as CSS. However,rnthermal expansion, formation pressure increases, and reservoirrndilation due to rock yielding can create some amount ofrnmechanical distress within the overlying caprock, and canrnhave similar consequences as CSS.rnAn integrated methodology has been developed to assessrnthermal-mechanical caprock integrity issues for SAGDrnprocesses in Alberta heavy-oil reservoirs. In this approach,rngeological, geomechanical and reservoir engineeringrninformation collected from logs, cores and well tests are usedrnto build a numerical model of the reservoir and its associatedrncaprock. Depending on the nature of the caprock and thernreservoir (I.e., naturally-fractured vs. unfractured), differentrnnumerical tools are used to develop a representative model.rnThis extended abstract presents some western-Canadian fieldrnexamples of stochastic modelling of natural fracture networksrnand coupled reservoir-geomechanical simulation of the SAGDrnprocess to illustrate the key geomechanical issues involved.
机译：稠油油藏的热采过程有时会损害盖层的完整性，并可能带来其他不良后果。例如，如果沿盖层中弱的不连续性产生大量应变（例如层理面，自然裂缝或断层），则可能发生套管破裂。同样，使用大量高温高压蒸汽的循环蒸汽刺激（CSS）操作可能会破坏井盖处的不连续性，或者可能是通过胶结不良的井眼。蒸汽辅助重力排水（SAGD）过程在较低的蒸汽压力下运行，通常不认为会带来与CSS相同的盖层完整性风险。但是，由于岩石屈服而引​​起的热膨胀，地层压力增加和储层扩张会在上覆盖层内造成一定程度的机械应力，并可能产生与CSS类似的后果。已开发出一种综合方法来评估阿尔伯塔省SAGDrn过程的热机械盖层完整性问题。稠油油藏。在这种方法中，从测井，岩心和试井中收集的地质，岩土力学和油藏工程信息被用来建立油藏及其相关盖层的数值模型。根据盖层和储层的性质（即自然裂缝与非裂缝），使用不同的数值工具来开发代表性模型。rn此扩展摘要提供了一些加拿大西部的自然裂缝网络随机建模和耦合的储层-地质力学实例的例子。 SAGDrn过程的模拟，以说明所涉及的关键地质力学问题。

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