固体颗粒防蜡剂PI-400的室内性能评价

Indoor Performance Evaluation of Solid Particle Wax Inhibitor PI-400

姚茂堂 王 茜 潘昭才 刘 举 孟祥娟 钟 诚

YAO Maotang，WANG Xi，PAN Zhaocai，LIU Ju，MENG Xiangjuan，ZHONG Cheng

针对国内各个油田共同面临的井筒结蜡和现有化学防蜡存在诸多不足的问题，引入一种可在水力压裂时伴随支撑剂一起进入人造裂缝的新型固体颗粒防蜡剂PI-400，并结合塔里木油田某区块储层高温高压的特征，自主设计了高温高压循环驱替装置，研究了PI-400在压裂液中的悬浮性、对加砂裂缝导流能力的影响及在高温、高压、不同流速下的动态防蜡效果。研究结果表明：PI-400可均匀分散、悬浮在压裂液中，分散性和悬浮性很好；当闭合压力≤45 MPa 时，添加 2%（相对于支撑剂的量而言）PI-400 后，加砂裂缝导流能力的下降率≤8.4%，PI-400 对加砂裂缝导流能力影响较小；PI-400 对该区块原油的防蜡效果良好。在 120℃、40 MPa 下，原油与PI-400分别在2、5和10 mL/min的排量下接触12 min后，原油的凝固点从25℃分别下降到12℃、11℃和8.5℃。本文不仅为塔里木油田某区块开展固体颗粒防蜡剂防蜡试验提供有效的数据支撑，而且可为国内其他油田的化学防蜡剂和化学防蜡工艺优选提供新的思路。图3参21

Aimed at the problem of wellbore paraffin deposition and chemical paraffin prevention，a type of solid particle paraffin inhibitor PI-400，which could be introduced into reservoir with fracturing fluid in hydraulic，was introduced. Combined with the characteristics of high temperature and high pressure of reservoir in a block of tarim oilfield，a high temperature and high pressure circulating displacement device was designed，and the suspension property of the PI-400 in the fracturing fluid was studied，the effect of the PI-400 on the conductivity of the fracture with proppant，and the dynamic paraffin prevention effect at high temperature，high pressure and different flow rates was evaluated. The results showed that the solid particle wax inhibitor PI-400 could be uniformly dispersed and suspended in the fracturing fluid. When the closing pressure was less than or equal to 45 MPa，after adding 2% PI-400，the reduction rate of flow conductivity of proppant-added fracture was less than 8.4%，indicating that the influence of PI-400 on the flow conductivity of proppant-added fracture was small. When the crude oil was treated with PI-400 at the temperature of 120℃ and the pressure of 40 MPa for 12 min at the discharge capacity of 2，5 and 12 mL/min，respectively，the solidification point of the crude oil decreased from 25℃ to 12℃，11℃and 8.5℃，respectively，which indicated that the solid particle wax inhibitor PI-400 had excellent paraffin prevention effect. This paper not only provides effective data support for the paraffin prevention test of solid particle paraffin inhibitor in a block of tarim oilfield，but also provides a new idea for optimization of domestic oilfield chemical paraffin inhibitor and chemical paraffin inhibitor process.

10.19346/j.cnki.1000-4092.2019.04.031