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 |
| DOI: | 10.57237/j.cse.2023.03.003 |
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Received: 20 June 2023
Accepted: 14 August 2023
Published Online: 29 August 2023
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