Song H.,Zhejiang Fenghong New Material Co. |
Li J.,Zhejiang Fenghong New Material Co. |
Chen J.,Zhejiang Fenghong New Material Co.
Drilling Fluid and Completion Fluid | Year: 2015
An organophilic clay was developed using octadecyl benzyl dimethyl ammonium chloride, a polymer ENVAMOD-95 and a purified sodium montmorillonite, and analyzed with X-ray and simultaneous thermal analyzer DSC-TGA. A water in oil mud was prepared with the organophilic clay, and was tested for its properties against a mud sample taken from a well. The analyses showed that octadecyl benzyl dimethyl ammonium chloride and ENVAMOD-95 can both enter into the space between the layers of montmorillonite to form organophilic clay. ENVAMOD-95 actually enhanced the thermal stability of the organophilic clay. In laboratory experiment, the viscosity and gel strength of the mud first increased and then decreased with temperature. The prepared water in oil mud retained its properties after hot-rolling 16 hours at 210℃, showing that organophilic clay made from ENVAMOD-95 had better thermal stability than other two polymer samples tested. Water in oil mud prepared with this organophilic clay at rig-site retained good properties after hot-rolling at 150℃, showing its potential for field use in HTHP wells. ©, 2014, North China Petroleum Administration Drilling Technology Research Institute. All right reserved.
Sanqin W.,University of Science and Technology of China |
Zepeng Z.,University of Science and Technology of China |
Yunhua W.,Zhejiang Fenghong New Material Co. |
Libing L.,University of Science and Technology of China |
Jiansheng Z.,Tangshan College
Materials Research Bulletin | Year: 2014
With cationic and anionic surfactants cetyltrimethylammonium bromide (CTAB) and sodium dodecylsulfonate (SDS) as modifiers, Ca-montmorillonites (Ca-Mt), artificial Na-montmorillonites (R-Na-Mt) and natural Na-montmorillonites (Na-Mt) with different cation exchange capacity (CEC) were modified by solution intercalation method, respectively. Then cation-anion organo-montmorillonites (OMt) were prepared. The influence of CEC on the basal spacing of cation-anion OMt and the influence mechanism were discussed by X-ray diffraction (XRD) and zeta potential testing. The results indicate that the basal spacing of cation-anion OMt is related to CEC. For the same type montmorillonites, the basal spacing of cation-anion OMt decreases with the increase of CEC and it is easier to get cation-anion OMt with greater basal spacing when CEC is lower. Moreover, the CEC of Na-Mt has the greatest influence on the basal spacing of cation-anion OMt. © 2014 Elsevier Ltd.