摘要
海相天然气气藏中多含有浓度较高的硫化氢气体,普光气田天然气中H2S含量达到15%,在湿环境下,H2S对水泥环的腐蚀性强。通过实验分析了H2S分压14 MPa,95、130和150℃湿环境下,H2S对水泥石的腐蚀规律;对比了腐蚀前后水泥试块的抗压强度、渗透率、矿物组成和微观结构。研究认为:在中低温区H2S腐蚀水泥石的主要产物是CaSO4.2H2O和AFt(钙矾石);在高温区H2S腐蚀水泥石的主要产物是CaSO4、莫莱石和不定形SiO2;腐蚀后的水泥试块强度降低,渗透率升高;在中低温区水泥石试块膨胀开裂严重,在高温区开裂程度较低;H2S的腐蚀程度随分压的增大而增加;添加胶乳可有效降低水泥石的开裂。
Most natural gas reservoirs in marine beds contain high concentration of H2S. The H2S concentration in Puguang gas field is up to 15%. H2S has strong corrosion to cement stone in wet environment. H2 S corrosion mechanism in cement stone at wet condition under the pressure of 14 MPa and temperature of 95℃, 130℃ and 150℃ were analyzed respectively. The compression strength, permeability, minerals, and micro structure of stone were compared before and after corrosion. Researches show that the main corrosion product is CaSO4 · 2H2O and AFT at low and middle temperature,and CaSO4 and SiO2 at high temperature. Cement has lower compression strength and higher permeability after corrosion. Cracks and inflation are more severe at middle-low temperature than that of at high temperature. In addition, the H2 S corrosion increases with the increase of H2 S pressure and cracks of cement stone can be reduced effectively by adding latex.
出处
《石油钻探技术》
CAS
北大核心
2008年第6期4-8,共5页
Petroleum Drilling Techniques
基金
国家高技术研究发展计划("863"计划)项目"高温高压高含硫气井新型防气窜防腐水泥浆体系研究"(编号:2006AA06Z209)资助
关键词
高温
水泥环
硫化氢腐蚀
抗压强度
渗透率
high temperature
cement sheath
hydrogen sulfide corrosion
compressive strength
permeability
作者简介
马开华（1960-），男，湖北荆门人，1982年毕业于江汉石油学院钻井工程专业，院长助理兼德州石油钻井研究所所长，教授级高工，主要从事深井超深井复杂地层固井方面的研究。系本刊主编。联系电话：（0534）2670185
