摘要
通过评价不同龄期样品的抗压强度、线膨胀率、孔隙率和微观形貌等,研究磷石膏基胶凝材料(PGS)应用于固井工程上的可行性。实验结果表明,按m[磷石膏(PG)]∶m[增强材料(KZ)]∶m[增强材料(GH)]∶m(水泥)∶m(生石灰)=50∶22∶6∶20∶2制备PGS,在50℃和80℃恒温水浴养护1 d的PGS固化体抗压强度分别为14.5、18.5 MPa;在50℃恒温水浴养护28 d的PGS固化体膨胀率较净浆水泥石提高了874.4%;PGS固化体总孔隙率(23.46%)较油井水泥石降低了34.0%,且渗透率明显低于净浆水泥石(1.32×10-3μm2);掺1%降滤失剂BXF200-L的PGS浆体的滤失量为78 mL,稠化时间为235 min;在50℃恒温水浴养护2 d的PGS固化体抗压强度为14.5 MPa,80℃恒温水浴养护1 d抗压强度为13.9 MPa,基本满足固井施工的要求。
To analysis the feasibility of phosphogypsum-based eementitious material （PGS）in the use of cementing, the properties of PGS were investigated by measuring the compressive strength,linear expansion rate,the porosity,and the microscopy of fracture surface. Results showed,PGS was prepared by blending phosphogypsum,slag, reinforced material（GH）,oil well cement, and lime at a constant proportion which was 50：22：6：20：2 （mass ratio）, the 1-day compressive strengths in 50℃ and 80℃ thermostatic water bath were 14.5 MPa and 18.5 MPa, respectively： the 28-day solid expansion rate in50 ℃ thermostatic water bath was increased by 874.4% compared to pure cement stone;the porosity of hardened PGS（23A6%） was decreased by 34.0% contrasted with cement stone whose permeability（1.32×10-3μm2） was higher obviously. When the content of BXF200-L was 1% wt,the water loss of PGS slurry was 78 mL, and thickening time （235 min. The 2-day compressive strengths in 50℃ thermostatic water bath was 14.5 MPa, and the 1-day compressive strengths in 80℃ thermostatic water bath was 13.9 MPa, these properties meet the construction requirement of cementing.
出处
《新型建筑材料》
2012年第11期71-75,共5页
New Building Materials
基金
江苏省企业博士基金资助项目(BK2009666)
关键词
磷石膏
胶凝材料
固井
抗压强度
可行性
phosphogypsum： cementitious material： cementing
compressive strength, feasibility
