北特鲁瓦底水油藏水平井分段酸压技术应用研究

Application & Study of Acid Fracturing Technology of Sectional Horizontal Well on Bottom Water Reservoir in North Troy

摘要: 北特鲁瓦油田是岩性–构造双重控制的多断块边底水油气藏，具有低孔低渗、地层压力低、易压窜底水层等改造难题。通过对该油田多井开采层含水变化情况进行分析，得出油水预测界面，对比以往安全压裂改造规模与油水纵向距离间的关系，结合地应力解释和裂缝模拟等深入研究，最后针对H817井提出连续油管水力喷砂射孔环空酸压工艺改造方案，酸化和酸压同井实施，同时采用水力喷射、组合酸、多级交替注入等集成技术模式，顺利完成14段酸化作业，取得了多项成果，如区域内相同段数规模下施工周期最短，施工后自喷生产，日产液过百方，日产气过万方。该井解决方案解决了多项改造难题，为同类井提供了技术参考。

Abstract: North Trova oilfield is a multi-fault block edge and bottom water reservoir controlled by lithology and structure, which has some difficult problems, such as low porosity and low permeability, low formation pressure, easy pressure channeling bottom water layer and so on. Through the analysis of the water cut change of the multi-well production layer in the oil field, the oil-water prediction interface is obtained, and the relationship between the previous safe fracturing transformation scale and the oil-water vertical distance is compared, combined with in-depth study of in-situ stress interpretation and fracture simulation. Finally, the modification scheme of coiled tubing hydraulic sandblasting perforation annular acid fracturing process is put forward for H817 well, and acidizing and acid fracturing are carried out in the same well. At the same time, the integrated technical modes such as hydraulic injection, combined acid and multi-stage alternating injection were adopted, and 14 sections of acidizing operation were successfully completed, and a number of achievements were obtained, such as the shortest construction period under the same number of sections in the region, self-spraying production after construction, daily production of more than 100 square meters of liquid, daily production of gas of more than ten thousand square meters. The solution of this well solves a number of reconstruction problems and provides a technical reference for similar wells.