遇水自膨胀封隔器专用橡胶的合成与性能分析

Manufacture and Properties Analysis of Rubber for Water Swelling Packer

许婵婵 余金陵 徐鑫

Xu Chanchan Yu Jinling Xu Xin

中国石化胜利石油管理局钻井工艺研究院, 山东东营 257017

Drilling Technology Research Institute, Shengli Petroleum Adiministration, Sinopec, Dongying, Shandong, 257017, China

胶筒是自膨胀封隔器的关键部件,作为胶筒原料的吸水膨胀橡胶其性能对自膨胀封隔器的封隔效果起决定作用,但国内目前缺乏对胶筒专用吸水膨胀橡胶及其合成材料的深入研究。为提高遇水膨胀橡胶的抗盐能力,用丙烯酸钠与丙烯酰胺共聚制备了遇水膨胀橡胶中起吸水作用的吸水树脂,试验分析了吸水树脂吸水性能的影响因素,发现参与反应的各单体的配比、单体总的质量浓度都可影响吸水树脂的吸水能力。将丁腈橡胶、自制吸水树脂及其他原料共混制得了遇水膨胀橡胶,测试了溶液矿物质种类、浓度和pH值,以及温度、吸水时间对橡胶膨胀能力的影响,并进行了遇水膨胀橡胶的抗拉伸试验,试验证明以上各因素对橡胶的膨胀能力都有影响,且制备的遇水自膨胀橡胶抗拉性能良好。对应用自制遇水膨胀橡胶的自膨胀封隔器进行了室内承压能力测试,试验结果表明,自膨胀封隔器承压能力达到14 MPa,可满足浅井现场施工要求。

Packer rubber element is the critical component of water swelling packer.The packing effect of packer is dependent on the property of water-swelling rubber.domestic in-depth research on rubber of this kind of packer and its synthetic materials is rare.Water absorbent resin is synthesized from sodium acrylate and acrylamide copolymerization in order to raise its resistance to salt.Factors which affect the water-absorption of resin are studied,and it is found that the water absorption of resin can be adjusted through changing monomer mixture rate and concentration.Nitrile butadiene rubber and water-absorbent resin are blended to make water swelling rubber.The influences of concentration and pH value of saline solution on the rubber swelling ability are studied.Tensile strength of the rubber was tested,too.Results of tests indicate that swelling ability of rubber depends on all factors mentioned above.Tensile strength of water swelling rubber made by us is very good.Finally,laboratory tests of isolation ability of the water swelling packer made with our synthesized rubber were conducted,the pressure bearing capacity up to 14 MPa,it can meet the requirement of shallow well opertation.

国家科技重大专项"低渗油气田高效开发钻井技术"课题6"低渗油气田完井关键技术"(编号:2008ZX05022-006)部分研究成果

https://doi.org/10.3969/j.issn.1001-0890.2012.03.008