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P-wave seismic time-lapse analysis of horizontal well completions causing pressure compartmentalization.

机译：水平井完井的P波地震时移分析导致压力分区。

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摘要

When horizontal wells are completed many changes can occur. During completions, pressure changes take place because of the fluid and proppant injected. One way of monitoring such changes is through the use of time-lapse seismic data. In Wattenberg Field, located near Greeley, Colorado, Anadarko Petroleum Corporation (APC) has teamed up with the Colorado School of Mines Reservoir Characterization Project (RCP) to acquire time-lapse seismic data over a section of land in which eleven horizontal wells were completed.;The P-wave seismic is of considerable interest since the P-waves are sensitive to pressure changes in the reservoir. However, the first step is to determine if there are considerable pressure changes associated with the completions. The net pressures from the completion reports per stage were studied. The net pressure indicates the creation of hydraulic fractures and the propagation of those fractures. This thesis hypothesizes that where there is a positive net pressure, the pressure is building up near the wellbore and a negative net pressure indicates hydraulic fracture propagation. A pre-stack seismic inversion was done to determine the P-impedance changes in the time-lapse surveys. The percent difference in P-impedance volume was observed with the net pressure trend in corresponding reservoir intervals. This analysis showed that the negative changes in P-impedance correlate with the negative net pressure. This analysis implies that the formation is being hydraulically fractured and the fractures are propagating away from the wellbore, so the net pressure is decreasing resulting in the decrease in P-impedance.;The results of this study allows for integration between the completion parameters and the time-lapse seismic analysis. This study then provides insight for the stimulated reservoir volume, since the seismic anomalies in combination with the completion pressures can identify areas that were fractured better than others. These areas correspond to negative net pressures during hydraulic fracturing stimulation.
机译：水平井完工后，可能会发生许多变化。在完井期间，由于注入了流体和支撑剂，压力发生了变化。监视此类变化的一种方法是通过使用延时地震数据。在位于科罗拉多州格里利市附近的Wattenberg油田，阿纳达科石油公司（APC）与科罗拉多矿山学校储层表征项目（RCP）合作，采集了一段已完成11口水平井的土地的时移地震数据。由于P波对储层中的压力变化敏感，因此P波地震引起了人们的极大兴趣。但是，第一步是确定与完井相关的压力变化是否很大。研究了每个阶段完工报告中的净压力。净压力指示出水力裂缝的产生以及这些裂缝的传播。本文假设，在存在正净压力的情况下，井眼附近的压力逐渐增大，而负净压力表明水力压裂扩展。进行叠前地震反演，以确定随时间推移勘测中的P阻抗变化。在相应的储层间隔内，随着净压力趋势观察到了P阻抗体积的百分比差异。该分析表明，P阻抗的负变化与负净压力相关。该分析表明，地层正在被水力压裂，并且裂缝正在远离井眼传播，因此净压力正在减小，从而导致P阻抗减小。时移地震分析。由于地震异常与完井压力相结合可以识别出比其他地区更好地压裂的区域，因此该研究为受激储层体积提供了见识。这些区域对应于水力压裂增产期间的负净压。

著录项

  • 作者

    Butler, Emily.;

  • 作者单位

    Colorado School of Mines.;

  • 授予单位 Colorado School of Mines.;
  • 学科 Geophysics.;Geology.;Petroleum engineering.
  • 学位 M.S.
  • 年度 2016
  • 页码 82 p.
  • 总页数 82
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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