一种钻井液降滤失剂的合成与室内评价

Synthesis and Indoor Evaluation of a Fluid Loss Additive with Significant Inhibition Effect

以丙烯酰胺(AM)、2-丙烯酰胺基-2-甲基丙磺酸(AMPS)、二甲基二烯丙基氯化铵(DMDAAC)、丙烯基吡咯烷酮(NVP)为单体,亚硫氢酸钠-过硫酸铵(质量比为1∶2)为引发剂,制备了丙烯酰胺-2-丙烯酰胺基-2-甲基丙磺酸钾-二甲基二烯丙基氯化铵-丙烯基吡咯烷酮共聚物(PAADN)。得到的最优合成条件为:m(AM)∶m(AMPS)∶m(DMDAAC)∶m(NVP)=51∶40∶3∶6,总单体质量分数为20%,反应温度为55℃,p H=7,引发剂用量为单体质量的0.5%,反应时间为5 h。并对该聚合物进行红外和热稳定性测试。红外光谱图中未显示双键特征峰,并且含有各个单体特征官能团峰,证明单体全部参与反应;热重-热差分析结果显示,该聚合物初始热分解温度为326.5℃;该降滤失剂对淡水、盐水、人工模拟海水基浆均表现出良好的降失水效果。

With sodium sulfite and ammonium persulfate（ the mass ratio of which is 1 ∶ 2） as the initiator,and acrylamide（ AM）,2-acrylamide-2-methyl propane sulfonic acid（ AMPS）,dimethyl diallyl ammonium chloride（ DMDAAC）,and allyl pyrrolidone（ NVP） as the monomers,a kind of performance polymer PAADN was prepared,which can be used in the drilling mud. By studying the polymer synthesis,we got the optimum synthesis conditions： the monomer ratio of m（ AM） ∶ m（ AMPS） ∶ m（ DMDAAC） ∶ m（ NVP） is 51 ∶ 40 ∶ 3 ∶ 6,the total monomers concentration is 20%,the reaction temperature is 55 ℃,p H is 7,the dosage of initiator is 0. 5%,and the reaction time is 5 h. The indoor evaluation of the performance of the polymer shows that the infrared spectrum characteristic peaks have not shown double bonds peak,and it contains every monomer peak,which indicates that all the monomers take part in the reaction. The thermogravimetric analysis results show that the polymer ＇s thermal stability is good,with its initial thermal decomposition temperature being 326. 5 ℃. The fluid loss additive exhibited good anti-dehydration performance in fresh water mud,salt water mud and artificial simulated seawater mud.