油管柱压裂封隔器动压下作用胶筒密封浸入泄漏数值分析

Numerical analysis of sealing leakage under dynamic pressure in fracturing packer rubber cylinder of oil pipe string

摘要

在油管柱多级压裂技术中，封隔器胶筒的密封浸人泄漏直接影响水力压裂效果。考虑扩张式压裂封隔器胶筒的几何、材料非线性，以及接触和流体浸入边界的多重非线性，采用数值分析方法，建立油管柱压裂封隔器动压作用下胶筒密封浸入泄漏非线性数值模型，推导胶筒密封面泄漏过程浸人流体的计算公式，采用迭代算法求解封隔器胶筒的动力学方程。结果表明：数值分析计算的浸入泄漏长度与实验测试结果对比，符合率在 11.1% 内，证明所建数值模型和计算方法的正确性。上、下封隔器浸入泄漏规律相同，在动压作用下，胶筒与套管之间反复出现的坐封与浸入泄漏转化，是导致封隔器密封泄漏的主要因素。该结果为优化油管柱压裂封隔器设计、提高胶筒密封性能提供指导。

Abstract

In multi-stage fracturing technology of oil pipe string, the sealing immersion leakage of the packer rubber cylinder directly affects the effect of hydraulic fracturing. Considering the geometric and material nonlinearity of the expansion fracturing packer rubber cylinder, as well as the multiple nonlinearities of contact and fluid immersion boundaries. A numerical model for the sealing immersion leakage of the rubber cylinder under dynamic pressure in hydraulic fracturing packers was established. The formula for calculating the fluid immersion process of the sealing surface leakage of the rubber cylinder was derived, and an iterative algorithm was adopted to solve the dynamic equations of the packer rubber cylinder. The results show that the comparison of the immersion leakage length calculated by numerical simulation with experimental test results showed a compliance rate within 11.1%, confirming the correctness of the numerical model and calculation method. The immersion leakage laws for upper and lower packers are the same. Under dynamic pressure, the repeated setting and immersion leakage transformation between the rubber cylinder and casing are the main factors leading to packer sealing leakage. The development of the sealing leakage analysis method of packer from static to dynamic pressure can provide guidance for optimizing the design of fracturing packer for tubing string and improving the sealing performance of rubber cylinder.

关键词

封隔器胶筒 / 浸入泄漏 / 数值分析 / 密封 / 非线性 / 油管柱压裂

Key words

packer rubber cylinder / immersion leakage / numerical analysis / sealing / nonlinearity / fracturing in oil pipe string

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基金资助

国家自然科学基金项目(52374034)

黑龙江省自然科学基金项目(LH2022E018)