克拉美丽气田火成岩天然裂缝漏失压力模型

doi:10.7657/XJPG20230113

摘要/Abstract

摘要：

克拉美丽气田火成岩地层发育裂缝，裂缝性地层中存在天然裂缝与孔隙或孔洞的复合结构，钻井过程中漏失压力与地层破裂压力差异较大。根据不同井段火成岩的裂缝—孔隙状态、裂缝开合、连通及充填情况，开展压力漏失机理研究，构建不同裂缝状态的漏失压力模型，依据地层孔隙压力、地应力等参数绘制分层漏失压力剖面，确定克拉美丽气田火成岩天然裂缝的压力漏失规律。研究表明，火成岩的闭合裂缝压力漏失受地应力控制，开启裂缝压力漏失受地层孔隙压力和充填状态影响。结合典型井的钻井参数，分析裂缝漏失压力在不同井轨迹下的变化规律，确定钻井液安全密度窗口，实现安全钻井。

关键词: 克拉美丽气田, 火成岩, 裂缝结构, 漏失压力模型, 钻井液, 密度窗口

Abstract:

Fractures are developed in the igneous strata of the Kelameili gas field. The composite structure consisting of natural fractures and pores or cavities in such fractured formations may result in a large difference between the leakage pressure and the formation fracture pressure during drilling. The leakage mechanism was investigated according to the fracture-pore occurrence and the fracture opening/closing，connection and filling of the igneous rocks in different well sections，the leakage pressure models under different fracture states were constructed，and the layered leakage pressure profile was plotted depending upon pore pressure，in-situ stress and other parameters，so as to determine the leakage law of natural fractures in the igneous rocks in the Kelameili gas field. The results show that the leakage pressure of closed fractures in the igneous rocks is controlled by in-situ stress，and the leakage pressure of open fractures is affected by formation pore pressure and filling state. Furthermore，combining with the drilling parameters from typical wells，the variation law of fracture leakage pressure under different well trajectories was analyzed，and the safe density window of drilling fluid was determined to ensure drilling safety.

Key words: Kelameili gas field, igneous rock, fracture structure, leakage pressure model, drilling fluid, density window

中图分类号:

TE21

杨虎, 薛晓军, 陈向辉, 李秀彬, 解俊昱, 张伟. 克拉美丽气田火成岩天然裂缝漏失压力模型[J]. 新疆石油地质, 2023, 44(1): 93-99.

YANG Hu, XUE Xiaojun, CHEN Xianghui, LI Xiubin, XIE Junyu, ZHANG Wei. Leakage Pressure Model of Natural Fractures in Igneous Rocks in Kelameili Gas Field[J]. Xinjiang Petroleum Geology, 2023, 44(1): 93-99.

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井区	地层	岩性	裂缝特征	孔隙压力系数	漏失压力系数	孔隙压力系数与漏失压力系数差	最小水平主应力系数
滴西14井区	巴塔玛依内山组	凝灰岩、砂泥岩	张性开启裂缝，有充填物	1.15~1.22	1.28~1.30	0.08~0.15	1.50~1.62
滴西14井区	巴塔玛依内山组	安山岩、玄武岩	压性闭合裂缝	1.26~1.28	1.55~1.60	0.25~0.35	1.50~1.62
滴西17井区	巴塔玛依内山组	凝灰岩、砂泥岩	张性开启裂缝，无充填物	1.35~1.37	1.38~1.40	0.04~0.05	1.50~1.65
滴西17井区	巴塔玛依内山组	安山岩、玄武岩、流纹岩	压性闭合裂缝	1.30~1.33	1.58~1.62	0.28~0.32	1.50~1.65
滴西18井区	松喀尔苏组	凝灰岩、砂泥岩	张性开启裂缝，有充填物	1.07~1.12	1.38~1.42	0.12~0.32	1.60~1.70
滴西18井区	松喀尔苏组	安山岩、花岗岩、二长玢岩	压性闭合裂缝	1.10~1.21			1.60~1.70