拖动式水力喷射分段压裂工艺在筛管水平井完井中的应用

The Application of Dragged Multistage Hydrojet-Fracturing in Horizontal Well with Screen Pipe Completion

为实现筛管水平井储层有效压裂改造和降低施工风险,对拖动式水力喷射分段压裂工艺进行了优化改进。根据水力喷射分段压裂工艺技术射流增压、射流密封和降低起裂压力的基本原理,结合筛管水平井的井况及特点,将拖动式水力喷射分段压裂工具与滑套式工具相组合,融合相应的施工工艺,降低了筛管井压裂管柱砂卡风险。成功对筛管水平井SA井实施3段加砂压裂,最高施工砂比达到40%,压裂规模72m3,压裂管柱成功上提出井。裂缝监测结果表明,在水平段压裂位置产生了3条走向明显的裂缝,裂缝长度均为110～135m,与设计长度吻合较好,实现了储层分段压裂目的。该井产油量由原来的4.0～5.0t/d提高到25.9t/d,压裂增产效果明显。

In order to stimulate horizontal wells with screen completion and decrease the risk in treatment,the dragged multistage hydrojet-fracturing（DHJF）was improved. Considering the characteristics of hydrojet technique, namely boosting pressure, sealing mechanism and decreasing the initial fracturing pressure, and the characteristic of screen completion, the jetting tool and sliding sleeve tools were combined and assembled at the end of treatment pipes. Then the DHJF was optimized to solve the problem of sanding in the fracturing string. The sanding risk of fracturing string could be greatly decreased. A horizontal well un- der screen completion was successfully fractured by DHJF. With 72m2 proppants in total and the highest sand ratio of 40 %, the length of three hydraulic fractures reached 110-135 m. Finally, the fracturing string was pulled out of the well. Micro-seismic mapping indicated that three hydraulic fractures were placed at strategically selected locations which improved the formation permeability. Daily oil production of Well SA increasede from 4.0-5.0 t/d to 25.9 t/d, proving good stimulation result in this well.