油气储层中盐水泥浆侵入规律研究

Study on the law of salt cement mud intrusion in oil and gas reservoirs

井筒中的泥浆性能及其在地层中的侵入状态直接制约测井采集质量,尤其在盐水泥浆体系条件下,使电阻率测量值明显降低,严重影响油气层评价的准确性;做好盐水泥浆侵入规律研究对油气层综合评价意义重大。前人主要从理论推导和数值模拟方面进行泥浆侵入机理及电阻率侵入影响校正方法研究,这些方法均是建立在理论数值模拟的基础上,以单点解释为主,存在多解性及非连续性问题。本文提出了基于实验室泥浆侵入模拟试验研究方法,探索了影响泥浆侵入程度的主要因素以及侵入规律。

The performance of mud in the wellbore and its intrusion state in the formation directly restrict the quality of logging collection, especially under the condition of salt and water mud system, so that the resistivity measurement value is significantly reduced, which seriously affects the accuracy of oil and gas reservoir evaluation.It is of great significance to study the law of salt and water mud intrusion for the comprehensive evaluation of oil and gas reservoirs. The former mainly studied the mud intrusion mechanism and the resistivity intru- sion influence correction method from the theoretical derivation and numerical simulation. These methods are based on the theoretical numerical simulation, mainly based on single point interpretation, and there are multiple solutions and discontinuity problems. Based on the experimental method of mud intrusion in laboratory, the main factors affecting the degree of mud intrusion and the law of intrusion are discussed.