Leakage Pressure Model of Natural Fractures in Igneous Rocks in Kelameili Gas Field

doi:10.7657/XJPG20230113

Abstract

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

CLC Number:

TE21

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.

Figures/Tables 7

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Table 1.

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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