Trajectory Adjustment Technology for Long Horizontal Wells in Chang 7 Shale Oil Reservoirs, Qingcheng Oilfield

doi:10.7657/XJPG20250314

Abstract

Abstract:

The shale reservoirs of the Chang 7 member in the Qingcheng oilfield are characterized by the combination of mud shale and multi-stage thin layers of fine to silty sandstone, posing significant challenges for optimizing and adjusting long horizontal well trajectories, which in turn affects the overall oilfield development effect. Four mature trajectory adjustment techniques, i.e. logging-seismic combined frequency-division attribute fusion, fine 3D geological modeling constrained by seismic structure, trajectory-stratigraphy matching, and curve shifting, were described with the adjustment success rates of 87.9%, 88.3%, 89.8% and 92.5%, respectively. Furthermore, the 3 techniques were evaluated regarding application scope, advantage, and limitation. Based on the evaluation results, a comprehensive analysis method was proposed for complex and challenging wells. The performances of these techniques were evaluated with respect to 11 parameters for 268 horizontal wells in the central Huachi area of Qingcheng oilfield. It is found that the application of the conventional mud-logging geosteering technique in conjunction with one trajectory adjustment technique increases the reservoir encountered rate to 79.4%, while the comprehensive analysis method improves the reservoir encountered rate to 84.2%.

Key words: Qingcheng oilfield, Yanchang formation, Chang 7 member, shale oil, long horizontal well, trajectory adjustment, rotary steering, logging-seismic combination

CLC Number:

TE348

YANG Yongxing, ZHU Guanchen, WANG Degang, ZHU Jialiang, REN Yilin, WANG Bo. Trajectory Adjustment Technology for Long Horizontal Wells in Chang 7 Shale Oil Reservoirs, Qingcheng Oilfield[J]. Xinjiang Petroleum Geology, 2025, 46(3): 367-374.

Figures/Tables 9

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Table 2.

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序号	自然伽马特征	成像形态变化特征	地质认识	井斜角与地层倾角的关系	调整措施
1	方位上自然伽马先上升，方位下自然伽马下降	先上切，再下切	上切出层，下切回层	井斜角>地层倾角	降斜后回层
2	方位下自然伽马先上升，方位上自然伽马下降	先下切，再上切	下切出层，上切回层	井斜角<地层倾角	增斜后回层
3	方位上自然伽马先上升，方位下自然伽马紧跟上升	持续上切	上穿隔夹层	井斜角>地层倾角	上穿层一定厚度后降斜
4	方位下自然伽马先上升，方位上自然伽马紧跟上升	持续下切	下穿隔夹层	井斜角<地层倾角	下穿层一定厚度后增斜
5	局部方位上自然伽马先上升后下降，方位下自然伽马基本不变	弱上切	上蹭局部夹层	井斜角≈地层倾角	缓降或稳斜
6	局部方位下自然伽马先上升后下降，方位上自然伽马基本不变	弱下切	下蹭局部夹层	井斜角≈地层倾角	缓增或稳斜

调整技术	井数/ 口	油层厚度/ m	隔夹层数/ 个	设计水平段长度/m	实钻水平段长度/m	水平段轨迹调整频次/ （次·口^-1）	轨迹调整决策时间/ （h·口^-1）	油层钻遇率/ %	Ⅰ类油层钻遇率/%	油层平均自然伽马/ API	录井油层气测含量/%	井均折合百米水平段可压裂段数	井均折合百米水平段可压裂簇数	压裂一次起压率/%	压裂液压裂砂无效利用率/%
传统录井导向技术	122	8.7	3.8	1 500	1 402	18	34.2	72.3	51.9	106.5	12.5	1.2	6.2	97.2	2.4
传统录井导向技术结合1种调整技术	86	8.2	4.1	1 500	1 452	12	15.6	79.4	60.1	98.2	14.6	1.3	6.4	98.1	1.8
联合应用综合分析方法	60	7.2	4.0	1 500	1 489	9	13.5	84.2	66.4	84.5	19.5	1.5	6.6	99.2	0.8