
第38卷第1期 2017年2月
油田化学
能源化工
Energy Chemical Industry
Vol.38 No. 1 Feb.2017
逐级拟合填充模型在中高渗地层钻井液中应用
苏超
(长江大学,湖北武汉430100)
摘要:为了有效阻止钻井液中有害固相颗粒及滤液侵人储层深部,通过研究建立了一套适合于新疆油田中、高渗油藏有效封堵的"逐级拟合填充"模型,并根据该模型推导出填充粒子的粒径配比及加量。对新疆油田储层段岩心孔喉大小分布和频率进行了分析,结果表明:岩心样本的最大孔喉半径为 75μm,平均孔喉半径为6~11μm,岩心孔喉半径主要分布在10~63μm;根据岩心孔联分布特征进行模型计算,得到该油田中高渗储层的最佳级配方案。室内评价试验表明:优选的级配暂堵剂能将聚磺钻并液体系的渗透率恢复值从70%提高到90%以上,具有良好的储层保扩效果,同时表明"逐级按合填
充"模型具有现实的应用意义。
储层保护
关键调:逐级拟合中高渗地层
钻井液文献标识码:A
中图分类号:TE254
文章编号20959834(2017)01005606
Application of fittingprogressivelyfillingmodel indrillingfluids of
the permeability reservoirs
SUChao
(Yangtze University, Wuhan 430100, China)
Abstract: In order to effectively prevent the harmful solid particles and filtrate in the drlling fluids from invading deep reservoir, a set of fiting progresively flling model which is suitable to pemeability reservoins plugging in Xinjiang Oilfeld is studied and estab lished. The particle size ratie and adding amount of flling particles ean be ealeulated through the model. The distribution and frequen-cy of pore throat size of core in Xinjiang Oilfield reservoirs is analyzed and the results show that the maximum pore throat radius of the core samples is 75 μm, the average pore threat radius is 6 11 μm, and the pore throat radius is mainly distributed in the range of 10 63 μm. The optimum granular composition scheme is determined by model caleulation based on distribution of the pore throat ra-dius of the core, The laboratory evaluation test indicates that the permeability recovery of polysulfonate drlling fluid system can be en-hanced from 70% to 90% by using optimized grading temporary plugging agent, which performs excellent reservoir protection effects, and shows practical application meaning of fiting progressively flling model.
Key words; fiuting progressively ; permeability reservoirs;drlling fluids ;reservoir protection
“逐级拟合填充”技术借鉴了固井水泥浆材料所用的成熟理论“紧密堆积理论”和数学“逐级拟合"理论[1-7]。从力学的角度分析填充粒子,若将并壁孔喉理想化为一个圆,则有2种情况使孔喉填充粒子的封堵最稳固:一是与孔喉半径相等的填充粒子进行完全填充封堵;二是有3个两两外切面与孔喉圆相内切的填充粒子对该孔喉进行封堵,一个填充粒子在3种作用力的共同作用下保持稳定,一且进人孔喉实现封堵,则封堵状态不宜被破坏,这与“紧密堆积理论"模型相符[8-10]。为了有效阻止钻
万方数据
井液中有害固相颗粒及滤液侵入储层深部,本文建立了一套适合于中、高渗油藏有效封堵的“逐级拟合填充”模型,并根据该模型推导出逐级填充粒子的粒径与其加量的关系,便于在钻井开发过程中借助很少的资料和借用邻井资料提出储层保护措施[9-15]
收稿日期:2016-08-02。
作者简介:苏超(1993--),男,湖北随州人,硕士研究生在读,主要从事油田化学方面研究工作。E-mail:546153598@ qq-com。