水平井环空预设多级井底控锥增油实验

为了降低水平井底水锥进和趾跟效应的影响,提出水平井环空预设多级井底的控锥技术,采用3D大型底水油藏模拟开发设备,分别对常规水平井、中心管水平井和多井底水平井开展了水脊形态和驱油效果实验,从而验证环通多级井底控锥技术的有效性。结果表明,采用多井底水平井比常规水平井以及中心管水平井开发优势明显,多级井底系统使井筒沿程的压力剖面更均衡,能削弱趾跟效应,延迟底水突破时间,增大波及体积,其开发效果比常规水平井、中心管水平井采收率分别提高9.98、5.95个百分点。对水平井环通预设多级人造井底稳油控锥技术的矿场转化应用进行工艺论证表明,环空预设多级人造井底结构复杂,但操作简单方便,具有矿场应用潜力。该研究可为底水油气藏控水高效开发提供技术借鉴与支撑。

Experiment on Controlling Cone and Increasing Oil with Preset Multi-stage Bottoms in Horizontal Well Annulus

For horizontal wells, in order to reduce the impact of bottom water coning and toe end effect, coning controlling technology with preset multi-stage bottoms in horizontal well annulus was proposed. Simulate development equipment in 3D large-scale bottom water reservoirs. And the experiment on water cresting shape and oil displacement effect was carried out in conventional horizontal wells, horizontal wells with central tube and horizontal wells with multiple bottoms, respectively. Through the experiment, the effectiveness of coning controlling technology with multiple bottoms in annulus was verified. The results show that horizontal wells with multiple bottoms have obvious advantages over conventional horizontal wells and horizontal wells with central tube. The multi-bottom system makes the pressure profile along borehole more balanced, weakens the toe end effect, delays the bottom water breakthrough time, and increases swept volume, whose development effect is 9.98 and 5.95 percentage points higher than that of conventional horizontal wells and horizontal wells with central tube, respectively. The field application of coning controlling and oil stabilizing technology with multiple man-made bottoms in horizontal well annulus shows that the structure of preset multi-stage man-made bottoms in annulus is complicated, while the operation is simple, which has application potential on field. This research can provide technical reference and support for the efficient water controlling development in bottom water reservoirs.