苏东区域煤气同采钻井轨迹控制技术研究
1. 中国石油集团川庆钻探工程有限公司长庆钻井总公司, 陕西西安 710065
2. 西安石油大学, 油气田化学陕西省高校工程研究中心, 陕西西安 710016
| 摘 要： | 本文主要结合该区域煤矿分布，通过对苏东区块地质分层、井身结构、轨迹优化设计、摩阻扭矩等进行分析优化，实现最大位移，探寻不同天然气开发模式下，气、煤资源利用的最优解（位移、水平段长）。基于煤、气协同共采理念优化不同井型（直/定井、水平井）的钻井造斜点、井身轨迹等参数，实现最优位移、水平段长。定向井井组施工井口数大于3口时，进行“鱼刺”状预分，主动分离，给后续施工井预留轨迹防碰空间。直井段轨迹走势若持续向井架大门方向（±30°范围内），应及时采取有效纠斜措施，以免给后续井的防碰施工造成困难。井组安排应考虑道路和优化井眼轨迹的需要，考虑靶前位移对施工的影响，定向井井组最大可实现1300米位移。总体设计时，应对各井排列施工顺序，建议先施工水平位移大、造斜点浅的井，并设计为后大门方向，设计前大门方向钻水平位移小，造斜点深的井和直井。水平井预留煤柱中井作为井口，考虑偏移距、防碰绕障，模拟最大水平位移，同一井场可布置：偏移距小于500，水平段900米以内的三维水平井四口，水平段1200米以内的二维水平井两口。 |
| 关 键 词： | 煤气同采; 保安煤柱; 最大位移; 最长水平段 |
| DOI： | 10.57237/j.cse.2023.03.003 |
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收稿日期: 2023-06-20
接受日期: 2023-08-14
在线出版日期: 2023-08-29
Research on the Control Technology of Drill-ing Trajectory for Gas Co-production in Su-dong
1. CNPC Chuanqing Drilling Engineering Co., Ltd. Changqing Drilling Corporation, Xi'an 710065, China
2. Shaanxi University Engineering Research Center of Oil and Gas Field Chemistry, Xi’an Petroleum University, Xi'an 710016, China
| Abstract: | Based on the distribution of coal mines in the region; this paper analyzes and optimizes the geological stratification; well bore structure; trajectory optimization design; friction torque; etc. of the Sudong block to achieve the maximum displacement and explore the optimal solution (displacement; horizontal section length) of gas and coal resources utilization under different natural gas development modes. Based on the concept of co-production of coal and gas; the parameters such as drilling deflection point and well trajectory of different well types (vertical/fixed well; horizontal well) are optimized to achieve the optimal displacement and horizontal section length. When the number of construction wells in the directional well group is more than 3; the "fishbone" pre-section shall be carried out; and the active separation shall be carried out to reserve the trajectory anti-collision space for the subsequent construction wells. If the track trend of the vertical well section continues to the direction of the derrick gate (within ± 30°); effective corrective measures shall be taken in time to avoid causing difficulties to the anti-collision construction of the subsequent wells. The arrangement of well groups should take into account the needs of roads and optimization of well trajectory; and the impact of displacement in front of target on construction. The maximum displacement of directional well groups can be 1300 meters. During the overall design; the construction sequence of each well should be arranged. It is recommended to construct the well with large horizontal displacement and shallow deflection point first; and design the direction of the rear gate. The design direction of the front gate is to drill the well and vertical well with small horizontal displacement and deep deflection point. The middle well of the reserved coal pillar of the horizontal well is used as the wellhead. Considering the offset distance; collision avoidance and obstacle avoidance; the maximum horizontal displacement can be simulated. The same well pad can be arranged with four three-dimensional horizontal wells with an offset distance of less than 500 and a horizontal section of less than 900 meters; and two two-dimensional horizontal wells with a horizontal section of less than 1200 meters. |
| Keywords: | Gas co-mining; Safety Coal Pillar; Maximum Displacement; Longest Horizontal Section |
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