接枝改性聚乙烯醇的合成及性能评价  

Synthesis and Properties of a High-Temperature Grafting Polyvinyl Alcohol Fluid Loss Additive

作　　者：刘学鹏[1,2] 张明昌[1] 丁士东[1] 刘伟[1] 汪晓静[1] 

机构地区：[1]中国石化石油工程技术研究院,北京100101 [2]中国石油大学(北京)石油工程学院,北京102249

出　　处：《石油钻探技术》2012年第3期58-61,共4页Petroleum Drilling Techniques

基　　金：国家科技重大专项"大型油气田及煤层气开发"之专题"海相油气井固井完井技术"(编号:2011ZX05005-006-004)部分研究内容

摘　　要：聚乙烯醇(PVA)作为油井水泥降失水剂,适用温度较低(<120℃),难以满足高温固井的需求。以PVA1788、2-丙烯酰胺-2-甲基丙磺酸(AMPS)、N-乙烯基吡咯烷酮(NVP)和交联剂乙二醛等为原料,合成了一种油井水泥降失水剂接枝改性聚乙烯醇(PVA-1)。室内试验评价了添加降失水剂PVA-1的水泥浆的耐温性能、流变性能、稠化性能、抗压强度和防气窜性能等。试验结果表明,加有降失水剂PVA-1的水泥浆API失水量可以控制在50mL以下,抗温能力接近150℃;加有PVA-1的水泥浆稠化时间稍有延长,抗压强度不降低,抗析水能力增强;其与分散剂DZS和缓凝剂DZH的配伍性良好,还能提高水泥浆的防气窜能力。综合分析认为,合成的PVA-1能够满足150℃以下高温固井的需求。As fluid loss additive for oil well cement, polyvinyl alcohol（PVA）is not suitable for forma- tions above 120 ℃, a novel oil-well cement fluid loss additive（PVA-1）, chemically cross-linked polyvinyl al- cohol（PVA） was synthesized from PVA, 2- acrylamido-2- methyl propane sulfonic acid（AMPS）, N-vinyl-2- pyrrolidone（NVP） ,and cross-linking agent. The properties（water-loss control property, rheology, thicken- ing curve, thickening time, free water, compressive strength and static gelling strength）of the cement slurry with PVA-1 were evaluated. The results show that the API fluid loss of the cement slurry with PVA-1 can be controlled under 50 mL,while its temperature tolerance is next to 150 ℃ ;the cement slurry with PVA- 1 has slightly longer thickening time,no reduction in compressing strength and improved water precipitati on resistance;moreover, the fluid loss additive （PVA-1）is highly compatible with dispersing agent DZS and retarder DZH,and can improve gas channeling of slurry. The study shows that PVA-1 can meet the requirements of high temperature cementation at nearly 150 ℃.

关 键 词：降失水剂 聚乙烯醇 接枝改性 水泥浆性能 

分 类 号：TE256.6[石油与天然气工程—油气井工程] TE256.7