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Tianjin, China

Ma Z.,Northwest University, China | Fan X.,Northwest University, China | Chen J.,Northwest University, China | Xie Y.,Fengyuan Petroleum Additives Co. | Jiao X.,Dagang Oilfield Group Co.
Shiyou Huagong/Petrochemical Technology | Year: 2012

Maleic acid polyether ester(Ester-L64) was synthesized from polyether glycol(L64) and maleic anhydride(MA)with toluene-p-sulfonic acid as the catalyst. The reaction conditions were studied by orthogonal experiments. The results show that the optimum reaction conditions are: m(L64): m (MA) 1: 2, w(p-toluenesulfonic acid) 1.8% (based on the total mass of reactants), reaction temperature 150 °C and reaction time 8 h. A quadripolymer(DEMU-L64) was synthesized from Ester-L64, methyl methacrylate(MMA), styrene(St)and methacrylic acid(MAA) with benzoyl peroxide(BPO) as the initiator by free radical solution copolymerization. Under the optimum reaction conditions of m(MMA): (Ester-L64) 1: 3.0, m(St): m(Ester-L64) 1: 15, m(MAA): m(Ester-L64) 1: 35, w(BPO) 1.8% (based on the total mass of monomers), reaction temperature 130 °C and reaction time 6 h, DEMU-L64 is good in the demulsification of crude oil. The structure and relative molecular mass of DEMU-L64 were characterized by means of FTIR and GPC, respectively.

Li Y.,Northeast Petroleum University | Ai C.,Northeast Petroleum University | Liu Y.,Dagang Oilfield Group Co. | Gao C.,Northeast Petroleum University
Open Fuels and Energy Science Journal | Year: 2014

The open hole completion CBM borehole wall intersects with the weak surface such as cleats and fractures. In the process of hydraulic fracturing, the fractures may origin from coal body or cleats, which makes the rupture mechanism and rupture models of the borehole wall being different from the conventional reservoirs. The previous model for calculating breakdown pressure of open hole completion borehole wall considering tension failure has poor applicability for calculating breakdown pressure. Considering the spatial relationship of the intersection of borehole wall and cleats, analyzing the stress state of borehole wall rock and cleats wall, and basing on elastic mechanics and fracture mechanics, the breakdown pressure calculation model for CBM open hole completion hydraulic fracturing was established. In the model, fractures initiate from coal rock body, tensile failure along with face cleats, shear failure along with face cleats, tensile failure along with butt cleats and shear failure along with butt cleats five kinds of damage modes were considered. According to example calculation, the breakdown pressure of HX-L1 well calculated using the model is 14.81 MPa. The actual pressure obtained by bottom hole pressure gage is 15.42 MPa, and the relative error is 3.96%. The calculated result agrees with the actual conditions. It can be concluded that the model can be used to calculate the breakdown pressure for open hole completion CBM well hydraulic fracture. © Yuwei et al.

Fan X.,Northwest University, China | Ma Z.-S.,Northwest University, China | Yan J.-Q.,Fengyuan Petroleum Additives Co. | Chen-Jing,Northwest University, China | Yan G.,Dagang Oilfield Group Co.
Oilfield Chemistry | Year: 2013

Maleic acid polyether ester(Ester-61)was synthesized from polyether glycol(L61)and maleic anhydride(MA)with p-toluenesulfonic acid as the catalyst. The reaction conditions were studied by orthogonal experiment. The results showed that the optimum reaction conditions were as follows, the mass ratio of L61 to MA was 1.5: 1, the content of p-toluenesulfonic acid was 1.8%, the reaction temperature was 150°c and the reaction time was 8 h. A novel comb-like bicomper(DEMU-L61)with hydrophilic side chains was synthesized from Ester-61 and allyl polyethylene glycol(XPEG-1000)using benzoyl peroxide(BPO)as the initiator by free radical solution copolymerization when the mass ratio of Ester-L61 to XPEG-1000 was 1: 0.9, the content of BPO was 1.0%, reaction temperature was 120deg;c and reaction time was 5 h. IR and NMR analysis showed the synthesized product was a target product. The DEMU-L61, obtained under the optimum conditions, had a good performance in the demulsification of crude oil from Yanchang oilfield Eastern district, the demulsification rate being about 99%, the purification oil content being less than 0.5% water.

Liu W.,Dagang Oilfield Group Co.
Drilling Fluid and Completion Fluid | Year: 2015

Molecular design of filter loss reducer was done with control over some factors affecting synthesis reaction such as the mass ratio of polymerization monomers, amount of initiators and reaction temperatures. The effort produced a filter loss reducer for oil well cement, BZF-L1, a copolymer made from five monomers. This filter loss reducer, according to laboratory test, works at temperatures up to 180 °C, and at salinity of cement slurry up to saturation. At 180 °C, by adjusting the concentration of BZF-L1, cement slurries mixed with water of any salinity from fresh water to saturation had their filter losses kept under 50 mL. Cement slurries treated with BZF-L1 had thickening time, compressive strength, settling stability, rheology and free water content that all satisfied the needs for field operation. One of BZF-L1's success cases was its use in cementing the Well 139X1.

Li G.,Dagang Oilfield Group Co. | Huang D.,Dagang Oilfield Group Co. | Ma H.,Dagang Oilfield Group Co. | Gu Y.,Dagang Oilfield Group Co. | And 3 more authors.
Drilling Fluid and Completion Fluid | Year: 2015

A new gel breaker, BZ-CAF, made from three monomers, acrylamide (AM), methacryloxyethyltrimethyl ammonium chloride (DMC) and acryloyloxyethyltrimethyl ammonium chloride (DAC), is developed for use as gel-breaking flocculent in waste water base drilling fluids. This high molecular weight polymer has no metal ions in its molecules, and can break the gel structures developed in a drilling fluid, while minimizes its effect on the properties of the new drilling fluid formulated from the old fluid. An ultra-high molecular weight ionic polymer secondaryflocculant, BZ-AAF, is synthesized with acrylamide and AMPS. Waste drilling fluids treated with BZ-CAF and BZ-AAF have COD removed by 94.03%, chroma elimination by 93.83%, and oil removed by 85.86%. Liquid separated from the treated waste drilling fluid can be used to formulate new drilling fluid with stable properties that are comparable to those formulated with fresh water. BZ-CAF and BZ-AAF have been used in 5 wells in Dagang oilfield, showing their potential in environment protection and water source economization. ©, 2015, North China Petroleum Administration Drilling Technology Research Institute. All right reserved.

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