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首页> 外文会议>Geothermal Resources Council Annual Meeting Expo >Interpretation of In-Situ Stresses at the Utah FORGE Site Using Pressure and Temperature Signatures
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Interpretation of In-Situ Stresses at the Utah FORGE Site Using Pressure and Temperature Signatures

机译：利用压力和温度签名对犹他州锻造网站的原位应力解释

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In Sept 2017, an injection program was carried out in the openhole toe (Zone 1) of Well 58-32 at the Utah FORGE site. Zone 1 in Well 58-32 encompasses all of the approximately 147 feet of open hole below the production casing shoe. After the initial injection program in 2017, a follow-up injection program was carried out in the openhole (Zone 1) and in two zones behind casing (denoted as Zones 2 and 3). This second injection program was carried out in April and May 2019. In each zone, a program of up to nine injection cycles was conducted, including a microhydraulic fracture test, a DFIT (Diagnostic Fracture Injection Test), a step rate test and flowback testing. We have made an integrated interpretation of the closure stress using both pressure and temperature data. Various methods were applied to infer the closure stress. The ISIP (instantaneous shut-in pressure) was used in the openhole section, Zone 1. The reopening pressure, G-function plots, pressure vs. square root of time, and diagnostic log-log plots were applied in both Zone 1 and Zone 2. Step rate up and step rate down tests were also used to evaluate the closure stress. Moreover, temperature analysis using the G-function was employed to interpret the closure stress. The closure stress gradients are: 0.67 to 0.81 psi/ft in Zone 1 (2017 test), 0.74-0.83 psi/ft in Zone 1 (2019 test), and 0.76-0.95 psi/ft in Zone 2. There is no stress interpretation in Zone 3 because fractures were likely not opened or reopened. The inferred "apparent" stress gradients in Zone 2 are greater than those in Zone 1. The higher stress gradient in Zone 2 could be caused by near-wellbore tortuosity or if the fractures were not perpendicular to σhmin. Higher pumping rate/volume gave a higher closure stress. This could be caused by back stress (poroelasticity), associated with pressurization of proximal fractures (natural or otherwise). This self-shadowed could be an important consideration for future stimulation activities.
机译：9月2017年9月，在犹他州锻造部位的58-32井的OpenHole Toe（1）孔（区域1）中进行了注射计划。井58-32区内1栋包括生产套管下方的大约147英尺的开放孔。在2017年的初始注射程序之后，在露天度（区域1）中进行后续注射程序，并在壳体后面的两个区域（表示为区域2和3）。该第二注射计划于2019年4月和5月进行。在每个区域中，进行了最多9个注射循环的程序，包括微液压断裂试验，DFIT（诊断骨折注射测试），阶梯率测试和流量测试。我们已经使用压力和温度数据进行了对闭合压力的综合解释。应用各种方法来推断闭合应力。在露天区1区中使用Isip（瞬时闭合压力），在第1区和区域中，重新打开压力，G函数图，压力与平方根和诊断日志图。 2.还用于评估闭合应力的步进利率和阶梯率下降试验。此外，采用了使用G函数的温度分析来解释闭合应力。闭合应力梯度为：0.67至0.81 psi / ft，区域1（2017次），0.74-0.83 psi / ft在1区（2019年测试）和0.76-0.95 psi / ft中。没有压力解释在第3区，因为可能没有打开或重新开放裂缝。区域2中的推断的“明显”应力梯度大于区域1.区域2中的较高应力梯度可能是由接近井眼曲折的曲折或骨折不垂直于ΣHmin引起的。较高的泵送速率/体积给出了更高的闭合应力。这可能是由背部应激（腹弹性）引起的，与近端骨折的加压相关（自然或其他方式）。这种自我阴影可能是未来刺激活动的重要考虑因素。

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