Estimating fractions of reinjected water return to produced fluids using natural tracers

使用天然示踪剂估算回注水返回采出液的比例

• 批准号: 12650917
• 负责人: ITOI Ryuichi
• 金额: $ 2.24万
• 依托单位: Kyushu University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12650917/
• 关键词: Natural Tracer; Reinjection; Geothermal Reservoir; Lumped Parameter Model; Chloride; Tank Model

Lumped parameter reservoir models were developed for estimating fractions of reinjected water return to produced fluids. The model basically consists of production zone and reinjection zone, and employs continuity equations to chemical constituents and mass of fluid. These zones can represent a combination of production and reinejection zones as well as production and reinejection wells. The chemical constituents such as chloride (Cl), stable isotope of water were found to be appropriate natural tracers through literature survey. In particular, Cl can be an excellent tracer because of its nonreactivity and conservativity in reservoirs. Fractions of reinjected water return to produced fluids were estimated with this model.Estimating methods employ on-line analysis algorithm and estimate optimum values of fractions at each moment when measurements were made. Field data from three different geothermal areas in Japan were analyzed for the fractions. Respective field showed different characteristics in terms of chemical constituents that were considered in developing the model. Estimated fractions vary with time which implies changes in reinjection program such as relocation of reinjection wells. Changes in fractions with time also suggests magnitude of reinjection return varies not directly by reinjection program but due to changes in reservoirs and/or production conditions.Further improvement of the models includes1) estimating reservoir volume2) simultaneous estimation of fractions in multiple well

建立了集总参数油藏模型，用于估算回注水回流到采出液的比例。该模型基本由产油区和回注区组成，对流体的化学成分和质量采用连续性方程。这些区带可以代表生产和注水区域以及生产和注水井的组合。通过文献调查，发现水中氯(Cl)、稳定同位素等化学成分是合适的天然示踪剂。特别是，氯可以作为一种很好的示踪剂，因为它在储集层中具有非反应性和保守性。利用该模型对回注回采液的比例进行了估算，估算方法采用在线分析算法，在测量的各个时刻估算出各组分的最佳值。对来自日本三个不同地热区的现场数据进行了分析，以获得这些分数。在开发模型时所考虑的化学成分方面，各个领域表现出不同的特征。估计的分数随时间变化，这意味着回注计划的变化，如重新注水井的搬迁。分数随时间的变化也表明，回注回报的大小不是直接受回注方案的影响，而是由于储层和/或生产条件的变化。模型的进一步改进包括：1)估计储集层体积；2)同时估计多口井的分数

项目成果

FUKUDA Michihiro: "Prediction of Changes in Well-Bottom Fluid Conditions from Wellhead Measurements"Proc. of 23rd PNOC-EDC Geothermal Conference. (in press). (2002)

FUKUDA Michihiro：“根据井口测量预测井底流体条件的变化”Proc。

松崎 亮: "滝上地熱地域における還元熱水の混入率の推定"九大地熱・火山研究報告. 11号. 121-128 (2002)

Ryo Matsuzaki：“滝上地热区还原热水混合率的估算”九州大学地热和火山研究报告11，第121-128号（2002年）。

Itoi, R., et al.: "Application of Wequential Least Squares Method for Estimating Fraction of Reinjected Water Return to Produced Fluid in Water Dominated Geothermal Reservoir"Proc.of International Workshop on Intelligent Mining Systems. 1-8 (2002)

Itoi, R., et al.：“应用Weequential Least Squares Method for Estimating Fraction of Reinjected Water Return to Produced Fluid in Water Hosted Geo Thermal Reservoir”Proc. of International Workshop on Intelligence Mining Systems。

松崎 亮, 糸井龍一, 田中俊昭, 後藤弘樹: "滝上地熱地域における還元熱水の混入率の推定"九大地熱・火山研究報告. 11号. 121-128 (2002)

Ryo Matsuzaki、Ryuichi Itoi、Toshiaki Tanaka、Hiroki Goto：“滝上地热区还原热水混合率的估算”九州地热和火山研究报告11，第121-128号（2002年）。

Itoi, R., et al.: "Estimating the fraction of reinjected water returned to the production fluid at Sumikawa, Japan"Proc.of the 22^<nd> New Zealand Geothermal Workshop. 209-214 (2000)

Itoi, R. 等人：“估算日本 Sumikawa 生产流体中回注水的比例”第 22 届新西兰地热研讨会议程。