一种固井用腐植酸-AMPS/DMAM/FA接枝共聚物降失水剂
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摘要
采用自由基聚合法将AMPS、N,N-二甲基丙烯酰胺(DMAM)、反丁烯二酸(FA)进行接枝共聚,在AMPS∶DMAM∶FA为1∶0.38∶0.08,单体总量与腐值酸钠的质量比为1∶0.2、引发温度为60℃,单体溶液的pH为7的条件下,合成了一种抗高温油井水泥降失水剂G85L,为黑色黏稠液体,固含量为20%。通过单体残留分析与红外表征证明了合成产物为接枝共聚物,并通过热重分析证明该产品抗温达265℃。参考API RP 10B-2 2013进行实验,评价了该产品在水泥浆中的各项性能,结果表明,该产品不仅在中低温有较好的控制失水能力,当加量为4%时可以将API失水量降至40 m L,而且在高温条件下也具有较强的控制失水能力,200℃下失水量可以控制在50 m L以内,并且对水泥浆的稠化时间、抗压强度无副作用,与多种水泥浆体系配伍性好,是一种普适性优良的抗高温产品。
A high temperature cement slurry fluid loss reducer, G85 L, was synthesized with 2-acrylamido-2-methyl propane sulfonic acid(AMPS), N,N-dimethylacrylamide(DMAM) and fumaric acid(FA) through radical polymerization under the following conditions: AMPS:DMAM:FA = 1∶0.38∶0.08, mass ratio of total monomers to sodium humate = 1∶0.2, initiation temperature 60 ℃, and pH(of the monomer solution)=7. G85 L was a viscous black liquid containing 20% solids. Analysis of the residual monomers and IR characterization showed that the synthesized product was a graft copolymer, and thermogravimetric analysis indicted that the property of the G85 L remained stable at 265 ℃. Filtration experiment(done in accordance with API RP 10B-2 2013) demonstrated that addition of 4%G85L reduced filter loss of cement slurry to 40 m L at low temperatures, and to less than 50 m L at 200 ℃. No evidences of sideeffect of G85 L on the thickening time and compressive strength of cement slurry have been observed during experiments. G85 L shows good compatibility with many cement slurry formulations and is a universal high temperature filter loss reducer for cement slurries.
A high temperature cement slurry fluid loss reducer, G85 L, was synthesized with 2-acrylamido-2-methyl propane sulfonic acid(AMPS), N,N-dimethylacrylamide(DMAM) and fumaric acid(FA) through radical polymerization under the following conditions: AMPS:DMAM:FA = 1∶0.38∶0.08, mass ratio of total monomers to sodium humate = 1∶0.2, initiation temperature 60 ℃, and pH(of the monomer solution)=7. G85 L was a viscous black liquid containing 20% solids. Analysis of the residual monomers and IR characterization showed that the synthesized product was a graft copolymer, and thermogravimetric analysis indicted that the property of the G85 L remained stable at 265 ℃. Filtration experiment(done in accordance with API RP 10B-2 2013) demonstrated that addition of 4%G85L reduced filter loss of cement slurry to 40 m L at low temperatures, and to less than 50 m L at 200 ℃. No evidences of sideeffect of G85 L on the thickening time and compressive strength of cement slurry have been observed during experiments. G85 L shows good compatibility with many cement slurry formulations and is a universal high temperature filter loss reducer for cement slurries.
引文
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[6]GAO L J,WANG S Q,ZHAO X F.Synthesis and characterization of agricultural controllable humic acid superabsorbent[J].Journal of Environmental Sciences,2013(25):69-76.
[7]TANG Y B,CHEN F Y,YE W,et al.A novel rectoritebased composite adsorbent for removing heavy metal ions and PAHs[J].Journal of Chemical and Pharmaceutical Research,2014,6(8):102-111.
[8]郝延顺,杨决算,邓倩珊,等.NaHm/AMPS/AM/AA接枝共聚物降滤失剂的合成[J].广东化工,2014(15):12-13.HAO Yanshun,YANG Juesuan,DENG Qianshan,et al.Synthesis of NaHm/AMPS/AM/AA graft copolymer fluid loss additive[J].Guangdong Chemical Industry,2014(15):12-13.
[9]王中华.腐植酸接枝共聚物超高温钻井液降滤失剂合成[J].西南石油大学学报(自然科学版),2010,32(4):149-155.WANG Zhonghua.Synthesis of humic acid graft copolymer drilling fluid loss additive in ultra high temperature[J].Journal of Southwest Petroleum University(Science&Technology Edition),2010,32(4):149-155.