小角度燕尾型同层侧钻水平井分段控水策略

doi:10.11885/j.issn.1674-5086.2021.08.31.01

摘要/Abstract

摘要： 渤海油田高含水低产低效的井逐渐增多，部分区块产量递减快。同层侧钻水平井技术搭配分段控水完井是治理高含水低产低效井的有效手段，但小角度燕尾型同层侧钻水平井应用分段控水完井后未见到控水效果。为此，通过建立理论模型分析发现此类井分段控水失效原理，确定了原井眼的“空腔”是分段控水技术在此类井上适应性差的主控因素。在考虑可行性及经济性等因素后，调整现阶段的钻完井思路，提出了水平段延伸与优化完井管柱配管的综合钻完井改进策略，并对该策略的有效性进行了矿场试验验证。试验井控水效果远超预期，投产164 d仍未见水，无水期累产油高达1.5×10⁴m³。该策略在目标井控水效果显著的同时，单井建井成本增幅仅为8.8%，为后续类似低产低效井治理提供思路及技术储备。

关键词: 低产低效井, 同层侧钻技术, 分段控水技术, 水平井控水, 钻完井策略优化

Abstract: In Bohai Oilfield, the number of wells with high water cut, low production and low efficiency has gradually increased, and the production of some blocks has declined rapidly. Sidetracking in the same layer with segmented water control completion was an effective method to tackle high water cut, low production and inefficient wells. Whereas, the effect of water control was not significant for small-angle swallowtail sidetracked horizontal wells with segmented water control technique. The theoretical model was build to find the reason why the effect of water control failed and it was found out that the original wellbore of this type of wells played the main role in this failure. After considering factors such as feasibility and economics, adjusted on existing drilling and completion method, a comprehensive drilling and completion improvement strategy featuring horizontal section extension and piping optimization for completion string was proposed, and the effectiveness of this strategy was verified in the field. The water control effect was much better than expected, no water production has been witnessed 164 d after commissioning, and the cumulative oil production in water free was as high as 15 000 m³. The target well adopting the new strategy achieved significant water control effect, while the cost of single well construction increased by only 8.8%. It provides ideas and technical reserves for the follow-up treatment of similar low production and low efficiency wells.

Key words: low production and low efficiency well, sidetracked technique in the same layer, segmented water control technique, horizontal well water control, drilling and completion strategy

中图分类号:

TE35

唐晓旭, 裴柏林, 赵威. 小角度燕尾型同层侧钻水平井分段控水策略[J]. 西南石油大学学报(自然科学版), 2024, 46(1): 97-104.

TANG Xiaoxu, PEI Bailin, ZHAO Wei. Segmented Water Control Strategy for Small-angle Swallowtail Sidetracked Horizontal Wells in the Same Layer[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2024, 46(1): 97-104.

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