中东LowerFars厚盐膏层钻井液室内研究  

Laboratory study on drilling fluid of thick salt bed in Lower Fars of Middle East

作　　者：邢希金 赵欣[2] 刘书杰 李玉光 

机构地区：[1]中海油研究总院,北京100027 [2]国石油大学(华东),山东青岛266580

出　　处：《石油钻采工艺》2014年第4期57-60,共4页Oil Drilling & Production Technology

基　　金：国家科技重大专项“海外典型油田厚盐岩层钻井液体系研究”部分研究内容(编号:2011ZX05030-005-07)

摘　　要：已钻井揭示出中东Lower Fars盐膏层钻井液流变性差,存在漏失及溢流等问题。研制了密度为2.30 g/cm3的复合盐饱和盐水钻井液,其塑性黏度为53 mPa·s,动切力为15 Pa;API滤失量小于2 mL,120℃/3.5 MPa下的高温高压滤失量8mL,滤饼厚度1 mm;盐膏样品和泥岩样品回收率分别为88%、79%;10%NaCl、1%CaCl2和8%劣质土污染后流变性变化小,滤失量小于3.5 mL,润滑系数小于0.1,缝宽200μm、5 MPa下累积漏失量2.4 mL/3 min。不仅能够满足中东Lower Fars盐膏层安全钻进需求,而且为国外类似油田钻进盐膏层提供了经验。Drilled wells reveal that the drilling fluid for Lower Fars salt-gypsum bed in Middle East has such problems as poor rheologicalproperty, lost circulation and overflow, etc. A composite saturated brine fluid with a density of 2.30 g/cm^3 was developed, whosePV is 53 mPa·s, YP is 15 Pa and API filtration loss is less than 2 mL; its HTHP filtration loss is 8 mL under 120 ℃/3.5 MPa; its filter cakethickness is 1 mm; the recovery rates of salt-gypsum sample and mudstone sample are 88% and 79% respectively. When contaminated by10% NaCl, 1% CaCl2 and 8% bad soil, its rheological property changed little, with filtration was less than 3.5 mL, lubricity was less than0.1, fracture width was 200 μm , and the cumulative loss under 5 MPa was 2.4 mL/3 min. It can not only meet the drilling of Lower Farssalt-gypsum bed in the Middle East, but also provide experiences for drilling of salt-gypsum bed in similar oilfield in other countries.

关 键 词：中东 盐膏层 饱和盐水钻井液 性能 封堵 

分 类 号：TE243[石油与天然气工程—油气井工程]