李新勇, 李骁, 赵兵, 王琨, 苟波. 顺北油田S井超深超高温碳酸盐岩断溶体油藏大型酸压关键技术[J]. 石油钻探技术, 2022, 50(2): 92-98. DOI: 10.11911/syztjs.2021068
引用本文: 李新勇, 李骁, 赵兵, 王琨, 苟波. 顺北油田S井超深超高温碳酸盐岩断溶体油藏大型酸压关键技术[J]. 石油钻探技术, 2022, 50(2): 92-98. DOI: 10.11911/syztjs.2021068
LI Xinyong, LI Xiao, ZHAO Bing, WANG Kun, GOU Bo. Key Technologies for Large-Scale Acid Fracturing of Ultra-Deep Fault-Karst Carbonate Reservoirs with Ultra-High Temperature for Well S in Shunbei Oilfield[J]. Petroleum Drilling Techniques, 2022, 50(2): 92-98. DOI: 10.11911/syztjs.2021068
Citation: LI Xinyong, LI Xiao, ZHAO Bing, WANG Kun, GOU Bo. Key Technologies for Large-Scale Acid Fracturing of Ultra-Deep Fault-Karst Carbonate Reservoirs with Ultra-High Temperature for Well S in Shunbei Oilfield[J]. Petroleum Drilling Techniques, 2022, 50(2): 92-98. DOI: 10.11911/syztjs.2021068

顺北油田S井超深超高温碳酸盐岩断溶体油藏大型酸压关键技术

Key Technologies for Large-Scale Acid Fracturing of Ultra-Deep Fault-Karst Carbonate Reservoirs with Ultra-High Temperature for Well S in Shunbei Oilfield

  • 摘要: 顺北油田S井目的层属于典型的超深超高温断溶体储层,工程地质条件和井筒条件复杂,酸压改造面临巨大挑战。针对上述酸压改造难点,提出了“回填井段集中改造+酸损伤降破+管柱浅下+加重压裂液组合提排量+前置液造缝+交替注入造高导流裂缝+自生酸疏通远端断溶体”的复合酸压技术,通过试验优选了超高温工作液体系,包括180 ℃聚合物压裂液、160 ℃加重瓜胶压裂液、160 ℃交联酸和自生酸;基于数值模拟结果优化了大型酸压方案,推荐压裂液规模为1 800~2 200 m3,酸液规模为800~1 000 m3。现场试验表明,相同注液排量下,注加重压裂液的井口压力比注聚合物压裂液降低了7%,应用效果明显。S井大型酸压后,测试天然气产量10.45×104 m3/d,取得了顺北4号断裂带开发的突破,也为类似油气藏大型酸压方案优化设计提供了技术借鉴。

     

    Abstract: The target formation of Well S in Shunbei Oilfield is a typical ultra-deep fault-karst carbonate reservoir. Due to the complex engineering and geological conditions and wellbore conditions, acid fracturing is confronted with great challenges. In light of above difficulties in reservoir stimulation, a set of compound acid fracturing technologies was proposed by "centralized treatment by backfilling + acid damage to reduce fracture pressure + shallow pipe string + flow rate increase by weighted fracturing fluid + pad fluid fracturing + alternative injection for high conductivity fracture + autogenous acid to connect the far fault-karst". A set of acid fracturing fluid systems was optimized for resistance to ultra-high temperature by tests, included polymer fracturing fluid at 180 ℃, weighted guar gum fracturing fluid at 160 ℃, crosslinking acid at 160 ℃, and autogenous acid. Then, an optimized large-scale acid fracturing treatment plan was made based on recommendations for working fluid scales by numerical simulation. The recommended scale of fracturing fluid was 1 000–1 200 m3 and the scale of acid fluid was 800–1 000 m3. The field test showed a significant decrease in the wellhead pressure with weighted fracturing fluid, which was 7% lower than that with polymer fracturing fluid under the same injection rate. After the large-scale acid fracturing of Well S, the test production of natural gas was 10.45 × 104 m3/d, which made a breakthrough in the exploration of the Shunbei No. 4 fault zone and provided valuable guidance for the large-scale acid fracturing design of similar reservoirs.

     

/

返回文章
返回