超浅层大位移水平井楼平2井钻井技术

为提高河南油田稠油储量动用程度，完善注蒸汽开发井网，增加油井热采产能，探索合理经济开发超浅层稠油油藏的新途径，在井楼区块部署了第1口超浅层中曲率大位移水平井——楼平2井。开展了表层定向、浅层松散地层中曲率井眼轨迹控制，中曲率井眼的入井管柱加压，钻井液体系配方和固井施工工艺研究。该井完钻井深530 m，垂深162.4 m，水平位移407.9 m，最大井斜96.28°，位垂比2.51，油层套管一次下至设计位置，固井质量合格，经蒸汽吞吐投产开发效果良好。该井及后续3口井的试验表明:在河南油田特浅松散地层，实施垂深162～185 m、井斜96°、位移410 m、位垂比在2.51以内的中曲率大位移水平井技术进行稠油开采是切实可行的。它的试验成功为国内其他同类油田的开发提供了经验。

Drilling techniques in ultra-shallow extended-reach Louping-2 horizontal well

In order to increase the production degree of the heavy oil reserves in Henan Oilfield, perfect the steam injection development well pattern, increase the thermal productivity of oil wells, explore new rational approaches to economic development of shallow ultra-heavy reservoirs, the first ultra-shallow medium curvature extended-reach horizontal well-Louping-2 well- is deployed in the Jinglou block. In view of the technical problems of the well, such as the shallowness, the medium curvature, and the loose formation, technical research on the medium curvature well path control in the surface directional formation and the shallow loose formation, the injected casing pressure of the medium curvature bore hole, the drilling fluid composition, the field technology and cementing operation technology is conducted. The well has a drilled depth of 530 m, a vertical depth of 164.2 m, a horizontal displacement of 407.9 m, and a maximum inclination 96.28 °. The ratio of the horizontal displacement to the vertical depth is 2.51. The production casing running to the designed position is fulfilled, and cementing is qualified. The operation and development effect of steam stimulation is good. Test in this well and three other wells shows that it is feasible to conduct heavy oil production in the ultra-shallow loose formation in Henan Oilfield by using the medium curvature extended-reach horizontal well technique with the implementing vertical depth ranging from 162 m to 185m, the inclination being 96°, the displacement of 410 m, and the ratio of the horizontal displacement to the vertical depth less than 2.51. The successful test can be a good reference to the development of other similar oilfields in China.