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水基压裂液对煤层储气层伤害的室内研究
引用本文:丛连铸,汪永利,梁利,李安启.水基压裂液对煤层储气层伤害的室内研究[J].油田化学,2002,19(4):334-336.
作者姓名:丛连铸  汪永利  梁利  李安启
作者单位:1. 石油勘探开发科学研究院廊坊分院,河北,廊坊,065007
2. 中国地质大学,北京,100083
摘    要:在煤粉填充物理模型(煤心)上,在室温下考察了过滤活性水,线性胶,滤去残渣的冻胶破胶液对渗透率的伤害。讨论了伤害煤层渗透率的两大因素;压裂液堵塞煤层割理;煤基质吸附压裂液而膨胀,所设计的煤心实验反映后一种因素的影响。实验结果表明,对于两种煤心的渗透率,线性胶的伤害率高达82.7%和91.4%。活性水的伤害率很小,仅为11.5%和3.2%;冻胶破胶液对另外两种煤心渗透率的伤害也相当高,达81.1%和54.5%。这些数据反映水基压裂液对不同煤化阶段煤层的伤害程度有较大差别,以羟丙基瓜尔胶作降阻剂的线性胶,其严重伤害来自吸附膨胀和残渣堵塞两个方面,但在地面压力太高的深井仍需使用此种压裂液,冻胶压裂液极易对煤层造成严重而不能解除的伤害,应慎重选择配方,对于煤层井的压裂,活性水压裂液的伤害最小。

关 键 词:水基压裂液  煤层储气层伤害  室内研究
文章编号:1000-4092(2002)04-0334-03
修稿时间:2001年12月25

A Laboratory Study on Damage to Gas-Bearing Coalbed by Aqueous Fracturing Fluids
CONG Lian Zhu ,WANG Yong Li ,LIANG Li ,LI An Qi.A Laboratory Study on Damage to Gas-Bearing Coalbed by Aqueous Fracturing Fluids[J].Oilfield Chemistry,2002,19(4):334-336.
Authors:CONG Lian Zhu  WANG Yong Li  LIANG Li  LI An Qi
Affiliation:CONG Lian Zhu 1,WANG Yong Li 2,LIANG Li 1,LI An Qi 1
Abstract:The damage to permeability of powdered coal packs by a filtered surfactant solution (SS), a non crosslingking gel (NCG), a filtered broken down crosslinked gel without solid residue (BDCG) is investigated at ambient temperature. Blockage of coal seams by fracturing fluids (FFs) and swelling of coal matrix owing to FF adsorption are discussed and considered to be the basic factors for coalbed permeability damage. The pack flow experiments designed express the influences of the later factor. The experimental results show that the damage by NCG is rather high, acounting 82.7% and 91.4%, and by SS is slight, 11.5% and 3.2%, for two coal sources and the damage by BDCG is high, two, for another two coal sources, 81.1% and 54.5%, respectively. These data indicate large difference in damage of coalbed of different coalification stage. UCG (with HPG as friction reducer) is necessary for fracturing jobs in deep coalbed gas wells of very high surface pressure and create damage through both adsorption/swelling and blockage with residue. Crosslinked gel causes serious and unrecoverable damage to coalbed thus must be formulated carefully. Of aqueous FFs, surfactant solution is the least damaging in fracturing jobs in coabled gas wells.
Keywords:water base fracturing fluids  gas  bearing coalbed  coal matrix  permeability damage  damaging mechanisms  coalbed gas wells  
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