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Gravel-Pack Evaluation Using a Memory Gamma-Gamma Density Tool

机译:使用内存伽马-伽马密度工具进行砾石堆评估

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Completions in poorly consolidated formations often require gravel packing or frac packing to eliminate the inflow of formation fines. The effectiveness of gravel placement in the screen-casing annulus or openhole annulus or behind casing (such as when prepacking perforation tunnels) may be qualitatively evaluated with treatment-pressure data. Voids in the gravel-packed screen-casing or openhole annulus are evaluated with data from density, neutron, gamma-tracer, or pulsed-neutron logs. When radioactive materials are used for evaluating proppant placement in the formation, however, gamma measurements are affected by the background signal produced by these materials. This signal makes conventional density and pulsed-neutron silicon-activation techniques ineffective.
机译:固结不良的地层中的完井通常需要砾石充填或压裂充填,以消除地层细屑的流入。砾石在筛管环空或裸眼环空中或在套管后(例如,在预填充射孔隧道时)的有效性可通过处理压力数据进行定性评估。使用来自密度,中子,伽马示踪剂或脉冲中子测井的数据评估砾石堆积的筛管或裸眼环空中的空隙。但是,当使用放射性物质评估支撑剂在地层中的位置时,伽马测量值会受到这些物质产生的背景信号的影响。该信号使常规密度和脉冲中子硅激活技术无效。

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