Anti-Collision and Obstacle Bypassing Techniques in Cluster Wells Drilling in Shallow Layers of the PY30-1 Gas Field
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摘要: 针对番禺30-1气田丛式井平台已钻井表层井眼位置存在不确定性、利用空槽口钻调整井时容易在浅层钻进中与邻井相碰的技术难点,研究了防碰绕障技术。在井眼轨道设计过程中,利用Landmark软件进行防碰计算,分析根据电子多点测斜数据绘制的邻井井眼轨迹的误差情况,选择合适的绕障初始点、绕障方位、造斜率和绕障近距离段,利用碰到套管的征兆,修正绘制的邻井井眼轨迹并重新进行防碰扫描,设计新的绕障轨道进行施工。在实钻过程中,使用陀螺测斜仪对井眼轨迹进行监控,减小井眼位置的不确定性,选用1.83°弯螺杆进行陀螺定向钻进,快速脱离邻井,且在钻进中随时监测碰撞邻井套管的征兆和返出物中的水泥含量。A11井在钻进过程中应用了防碰绕障技术,顺利钻至井深541.00 m后,距相邻的A8H井5.50 m,距A5H井3.30 m,且呈逐渐远离趋势,成功解决了浅层钻进中的防碰绕障问题。番禺30-1气田丛式井浅层钻进防碰绕障技术可为其他气田类似高密度丛式井浅层钻进防碰绕障提供技术参考。Abstract: In PY30-1 Gas Field, well trajectories at shallow depth in wells drilled on cluster well platforms were uncertain, and it was possible that the infill wells might collide with surrounding wells while drilling in the shallow formations. In order to solve these difficulties, anti-collision and obstacle bypassing techniques were developed. When the well trajectory was designed, an anti-collision calculation was performed using Landmark software. The kick-off point, azimuth, deflection rate and short bypassing section were selected after an analysis of the errors of adjacent well trajectories mapped on the basis of electronic multishot data. The adjacent well trajectories were corrected using anti-collision scanning again based on available indications. Then new bypassing trajectories were designed and developed. In practical drilling, a Gyro was used to measure well trajectories so that the uncertainty of well locations was reduced. Directional drilling was conducted with PDM (Positive Displacement Motor) with top angle of 1.83° in order to escape from the surrounding wells as soon as possible. In addition, monitoring operations were carried out on the signs of surrounding casing collision and the cement content of returns. Well A11 was taken as an example for anti-collision and obstacle bypassing operations with the goal of illustrating and analyzing the results. This well was 5.50 m away from Well A8H and 3.30 m from Well A5H when it was drilled to the depth of 541 m. Gradually, they increased their spacing. Thus it was possible to successfully implement anti-collision and obstacle avoidance techniques while drilling in shallow layers. The research results in this paper will provide the references for anti-collision and obstacle avoidance for similar high-density cluster wells in shallow formations in the PY30-1 Gas Field.
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Keywords:
- cluster wells /
- shallow formations /
- anti-collision /
- bypassing obstacles /
- PY 30-1 Gas Field
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