双子表面活性剂型页岩抑制剂的合成及性能

Synthesis and Performance of Gemini-Surfactant Shale Inhibitor

摘要:

以二乙醇胺、溴代十二烷和二溴乙烷为原料，采用“两步法”合成了一种新型双子表面活性剂型小阳离子页岩抑制剂：N1,N2-双十二烷基-N1,N1,N2,N2-四-(2-羟乙基)-二溴乙二铵 (Gemini-DHEDB），分别采用线性膨胀、页岩滚动回收和沉降稳定性试验对其抑制性进行了研究，结果表明：质量浓度2% g/L的 Gemini-DHEDB溶液中钠基膨润土（Na-MMT）16h后的线性膨胀高度和页岩滚动回收率分别为4.27mm和52%，优于同等浓度下二甲基二烯丙基氯化铵、四丁基溴化铵溶液溶液和三甲基2-羟乙基溴化铵中的10.62mm (31%)、9.41mm (36%)和7.74mm (41%)。沉降稳定试验中，淡水基浆沉淀完成时间大概是14h，最终沉淀厚度大约为38mm；添加有Gemini-DHEDB的基浆沉降时间明显缩短为1.2h左右，最终的沉降高度的大约为45mm。采用FIIR、晶层间距测定（XRD）和扫描电镜（SEM）对Na-MMT/抑制剂复合材料微观结构进行了表征，结果表明：Gemini-DHEDB可与Na-MMT发生插层吸附并有效改变Na-MMT微观形貌。

Abstract:

A novel Gemini-surfactant type small cationic shale inhibitor: N1, N2-didodecyl-N1, N1, N2, N2-tetra (2-hydroxyethyl)-dibromoethane diammonium (Gemini-DHEDB), was prepared with diethanolamine, bromododecane and dibromoethane by Two–Step Method. Linear expansion tests, rolling recycling tests and sedimentation stability analysis tests were utilized to study its inhibition property, respectively. Results showed that the linear expansion height of sodium montmorillonite (Na-MMT) and the shale rolling recovery rate of shale was were just 4.27 mm and 52% in Gemini-DHEDB solution (mass concentration of, 2g/L) after 16h. , which were superior to the results in 2g/L dimethyl diallyl ammonium chloride (10.62mm, 31%), 2g/L tetrabutyl ammonium bromide (9.41mm, 36%) and 2g/L 3-methyl-2-hydroxyethyl ammonium bromide solution (7.74mm, 41%).Meanwhile, the linear expansion height and shale rolling recovery of dimethyl diallyl ammonium chloride, tetrabutyl ammonium bromide and 3-methyl-2-hydroxyethyl ammonium bromide solution was 10.62mm (31%), 9.41mm (36%) and 7.74mm (41%), respectively. , In sedimentation stability analysis tests, the Completion sedimentation completion sedimentation time of fresh water based fluid was about 14 h and the final thickness of sedimentation is was 38mm, while upon the addition of Gemini-DHEDB, the sedimentation time was obviously reduced to 1.2 hours and final thickness was 1.2 h and 45 mm. The micro structures of sodium montmorillonite (Na-MMT) composites were characterized via FT-IR analysis, X-ray diffraction (XRD) and scanning Scanning Electron Microscopy (SEM). Characterizations demonstrated that the successful intercalation and adsorption of Gemini-DHEDB into the Na-MMT interlayer, and had changed the micro structures of Na-MMT and the successful incorporation of Gemini-DHEDB with Na-MMT.