准噶尔盆地呼图壁地区超深超高压致密气藏压裂扩展模拟及优化设计

doi:10.3969/j.issn.1672-7703.2025.03.012

摘要/Abstract

摘要： 呼图壁地区HT1井区储层埋深较大，低孔低渗透且致密，高温高压和天然裂缝发育条件下的裂缝扩展规律尚不明确，压裂施工存在挑战。针对此问题，首先对目的层岩心在高温高压条件下进行三轴压缩实验，获取弹性模量、泊松比等参数分布特征；然后基于地质工程一体化方法，综合利用相关实验数据、岩心、测井及地震解释等资料，建立三维地质力学模型；最后以地质力学模型为约束，开展考虑天然裂缝的直井压裂扩展模拟、施工参数优化设计以及生产历史拟合及预测。结果表明：（1）目标区块杨氏模量平均值为37.5GPa，泊松比平均值为0.25，最大水平主应力平均值为220MPa，最小水平主应力平均值为180MPa，最大、最小水平主应力值远大于常规气藏（普遍小于100MPa）；（2）基于停泵压降的裂缝参数反演，通过设置小尺度天然裂缝参数长度为70m，间距为150m，拟合了压裂缝长；（3）排量8m³/min，射孔长度8~10m，加液量910m³，砂比10%~16%为最优参数；（4）压裂投产下，稳产时间延长8年、累计产气量增加16.13×10⁸m³，压裂效果改善明显，为相关区块开发提供指导意义。

关键词: 超高压致密气藏, 地质工程一体化, 压裂参数优化, 天然裂缝模型, 数值模拟

Abstract: The reservoir buried depth in HT1 well area in Hutubi area is relatively deep, low porosity, low permeability and dense. The fracture propagation law under the condition of high temperature, high pressure and natural fracture development is not clear, which poses challenges for fracturing construction. To solve this problem, the core of the target layer is subjected to triaxial compression experiment under high temperature and high pressure, and the elastic modulus, Poisson ratio and other parameters are obtained. Based on the 3D geological model, a 3D geomechanical model is established to simulate the diagenetic environment of the block by using the relevant experimental data, core data, well logging data and seismic interpretation. Finally, under the constraints of the geomechanical model, the fracturing extension simulation, construction parameter optimization design, production history fitting and prediction of vertical well considering natural fractures are carried out. The results show that: ① The average value of Young’s modulus in the target block is 37.5GPa, the average value of Poisson’s ratio is 0.25, the average value of maximum horizontal principal stress is 220MPa, the average value of minimum horizontal principal stress is 180MPa, The maximum and minimum horizontal principal stress values are much higher than those of conventional gas reservoirs (generally less than 100MPa). ② Based on the inversion of the fracture parameters based on the pressure drop of the shut down pump, the length of the compression fracture is fitted by setting the parameter length of the small scale atural fracture 70m and the interval 150m. ③ Discharge rate of 8~9m³/min, perforation length of 8m, liquid volume of 910m³ and sand ratio of 10%~16% are the optimal construction parameters. ④ Under fracturing operation, the stable production time is extended by 8 years, the cumulative gas production increases by 16.13×10⁸m³, and the fracturing effect is significantly improved, which provides guidance for the development of related blocks.

Key words: Ultra-high pressure tight gas reservoir, Geological engineering integration, Fracturing parameter optimization, Natural fracture model, Numerical simulation

中图分类号:

TE357.11

张芮菡, 熊卓航, 赵传凯, 石磊, 闫利恒, 仇鹏. 准噶尔盆地呼图壁地区超深超高压致密气藏压裂扩展模拟及优化设计[J]. 中国石油勘探, 2025, 30(3): 161-174.

Zhang Ruihan, Xiong Zhuohang, Zhao Chuankai, Shi Lei, Yan Liheng, Chou Peng. Fracturing propagation simulation and optimal design of ultra-deep ultra-high pressure tight gas reservoirs in Hutubi area[J]. China Petroleum Exploration, 2025, 30(3): 161-174.

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