水平井固井滑套结构对起裂压力影响规律分析

发布时间：2018-04-13 16:41

本文选题：水平井 + 固井滑套压裂　；参考：《科学技术与工程》2016年36期

【摘要】：在水平井无限级固井滑套分段压裂中,较高的起裂压力增加了压裂现场施工的难度和风险,是压裂施工遇到的主要问题之一。为有效降低起裂压力,以鄂尔多斯盆地无限级固井滑套压裂为工程背景,建立了地层-水泥环-压裂滑套耦合系统非线性有限元模型,分析了固井滑套长方形、斜向型、圆形孔口以及长方形孔口参数对压裂起裂压力的影响规律。结果表明,在地质力学参数相同条件下,3种孔口形状滑套的起裂压力均随孔口面积的增大而减小;而在孔口面积相同的条件下,长方形孔口比圆形和斜向型更能有效降低储层起裂压力。对于长方形孔口滑套,其宽度对降低起裂压力不明显;其孔口长度增加、数量增多、方位角减小对降低起裂压力十分明显;若孔口方位角不为零,会导致起裂位置变化,引起水力压裂起裂更为困难。
[Abstract]:In the stage fracturing of infinite cementing casing in horizontal wells, the higher initiation pressure increases the difficulty and risk of fracturing field operation, and is one of the main problems encountered in fracturing operation.In order to effectively reduce the initiation pressure, a nonlinear finite element model of formation cement ring-fracturing sliding casing coupling system is established with infinite cementing casing fracturing in Ordos Basin as engineering background. The rectangular and oblique type of cementing sliding casing are analyzed.The effect of the parameters of circular and rectangular orifice on fracturing initiation pressure.The results show that the initiation pressure of three kinds of orifice slide sleeve decreases with the increase of orifice area under the same geomechanical parameters, but under the same condition of orifice area, the crack initiation pressure decreases with the increase of orifice area.Rectangular orifice is more effective than circular and oblique type in reducing reservoir initiation pressure.For rectangular orifice slide sleeve, the width is not obvious to reduce the initiation pressure, the length of the orifice increases, the number increases, the azimuth decreases obviously to reduce the initiation pressure, and if the orifice azimuth angle is not zero, the initiation position changes.It is more difficult to start fracturing by hydraulic fracturing.
【作者单位】：中国石油大学(华东)石油工程学院;
【基金】：国家自然科学基金项目(51574270;51504280) 国家科技重大专项项目(2011ZX05037)资助
【分类号】：TE357

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