天然气地球科学 ›› 2019, Vol. 30 ›› Issue (12): 1694–1700.doi: 10.11764/j.issn.1672-1926.2019.07.013

• 天然气开发 • 上一篇    

提升高温气井酸压有效缝长方法

刘壮1(),郭建春1,马辉运2,周长林2,苟波1,3,任冀川1   

  1. 1. 西南石油大学油气藏地质及开发工程国家重点实验室, 四川 成都 610500
    2. 中国石油西南油气田公司工程技术研究院, 四川 成都 610017
    3. 西南石油大学博士后科研流动站, 四川 成都 610500
  • 收稿日期:2019-02-26 修回日期:2019-07-03 出版日期:2019-12-10 发布日期:2020-03-25
  • 作者简介:刘壮(1995-),男,湖北仙桃人,博士研究生,主要从事油气藏增产改造研究.E-mail: 1179184054@qq.com.
  • 基金资助:
    中国石油重大科技专项“西南油气田天然气上产300亿立方米关键技术研究与应用”(2016E-0609)

Simulation study of the approach to enhance acid penetration distance in high temperature gas well: Case study of Qixia Formatiom, western Sichuan Basin

Zhuang Liu1(),Jian-chun Guo1,Hui-yun Ma2,Chang-lin Zhou2,Bo Gou1,3,Ji-chuan Ren1   

  1. 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China
    2. Engineering and Technology Research Institute, PetroChina Southwest Oil & Gas Field Company, Chengdu 610017, China
    3. Post?doctoral Research Center, Southwest Petroleum University, Chengdu 610500, China
  • Received:2019-02-26 Revised:2019-07-03 Online:2019-12-10 Published:2020-03-25

摘要:

为了提高川西地区深层高温气井酸压方案设计的有效性和准确性,建立了考虑酸压过程中井筒—裂缝综合热效应的酸压有效缝长数值计算模型。以区块内的一口预探井栖霞组储层的酸压改造为例,研究了酸压过程中不同的热效应对于酸压有效缝长的影响,并开展了施工参数对于酸压有效缝长的敏感性分析。结果表明:①井筒传热效应会提升缝口酸液温度,加剧近井地带裂缝壁面的酸岩反应,缩减酸压有效缝长;②相同注酸排量条件下,当注酸量达到一定量后,单纯提高酸量对酸压有效缝长的提升有限。相同注液量条件下,提高注酸排量有利于裂缝向深部扩展而降低缝口过度刻蚀,能有效提升酸压有效缝长。基于研究结论,为X1井设计了一套胶凝酸酸压方案,压后测试产量约为地质条件与改造规模相似邻井产量的1.4倍。

关键词: 酸化压裂, 温度场, 深层高温储层, 酸压有效缝长, 数值模拟

Abstract:

For the purpose of improving the efficiency and accuracy of acid fracturing project design for the deep and high-temperature gas wells in western Sichuan Basin, an acid penetration distance of acid fracturing mathematical calculation model considering heat effects of well-bore and acid-rock reaction was established. An acid fracturing case of a field candidate well in Qixia Formation was taken as an example, the influence of different heat effects on acid penetration distance was researched and the sensitivity analysis of acid fracturing operation parameters was conducted. And the following research results were obtained. Firstly, heat transfer effect of wellbore elevated the acid temperature at the fracture inlet, which intensified the acid/rock reaction at fracture wall and decreased the acid penetration distance. Secondly, under the same injection condition, when the injected acid reached a certain volume, the increase of acid volume was limited to enhance the effective acid penetration distance. Finally, with the same injection volume condition, increasing injection rate could promote the propagation of fracture to the deep reservoir and reduced the excessive acid etching at the fracture inlet, which was beneficial to enhance acid effective penetration distance. Based on the results, a gelled acid treatment design was recommended for Well X1. The post-treatment production of Well X1 was 1.4 times that of the adjacent well, which have similar geological condition and treatment scale.

Key words: Acid fracturing, Temperature field, Deep and high temperature reservoirs, Acid penetration distance, Numerical simulation

中图分类号: 

  • TE357

图1

井身结构与温度标点示意"

表1

模型计算基础参数"

类型 参数 类型 参数
工程参数 酸液注入温度/℃ 25 地层岩石参数 储层厚度/m 50
施工时间/min 75 杨氏模量/MPa 40 000
油管内外径/mm 38/44.5 泊松比 0.25
套管内外径/mm 78.9/88.9 孔隙度/% 2.5
油/套比热容/[J/(kg·℃)] 460 地温梯度/(℃/m) 0.019
水泥环比热容/[J/(kg·℃)] 1 800 渗透率/(×10-3μm2) 3.5
地层比热容/[J/(kg·℃)] 1 000 酸液性质参数 酸液浓度/% 20
油/套导热系数/[W/(m·℃)] 53 酸液黏度/mPa·s 20
水泥环导热系数/[W/(m·℃)] 0.85 反应级数 0.36
地层导热系数/[W/(m·℃)] 2.6 酸液滤失系数/(m/min0.5) 0.8×10-3
油/套密度/(kg/m3) 7 800 反应活化能/(J/mol) 13 000
水泥环密度/(kg/m3) 1 900 标况下氢离子传质系数/(cm2/s) 0.5×10-4
地层岩石密度/(kg/m3) 2 650 频率因子/[(mol/L)-mmol/(cm2·s)] 0.001 8

图2

井筒温度场模拟结果与井底实测温度对比"

图3

不同施工时间对应的裂缝内酸液温度分布"

图4

注酸75min时裂缝内酸液温度分布"

图5

不同施工时间下不同热效应对于酸压有效缝长的影响"

图6

注酸75min时热效应对于酸蚀缝宽的影响"

图7

不同施工参数对于酸压裂缝参数影响"

表2

常规酸与胶凝酸缓蚀性能对比"

体系 常规酸 胶凝酸
与大理石块反应时间/s 683 1 972

图8

X1井酸压施工曲线"

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