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Improving the anti-collapse performance of water-based drilling fluids of Xinjiang Oilfield using hydrophobically modified silica nanoparticles with cationic surfactants

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Petroleum Science 2023年第3期20卷 1768-1778页

作者： He Li Xian-Bin Huang Jin-Sheng Sun Kai-He Lv Xu Meng Zhen Zhang Key Laboratory of Unconventional Oil&Gas Development(China University of Petroleum(East China) Ministry of Education)Qingdao266580ShandongPR China School of Petroleum Engineering China University of Petroleum(East China)Qingdao266580ShandongPR China PetroChina Tarim Oilfield Company Korla841000XinjiangPR China

Wellbore instability,especially drilling with water-based drilling fluids(WBDFs)in complex shale for-mations,is a critical challenge for oil and gas development.The purpose of this paper is to study the feasibility of using hydrophobically modified silica nanoparticle(HMN)to enhance the comprehensive performance of WBDFs in the Xinjiang Oilfield,especially the anti-collapse performance.The effect of HMN on the overall performance of WBDFs in the Xinjiang Oilfield,including inhibition,plugging,lu-bricity,rheology,and filtration loss,was studied with a series of experiments.The mechanism of HMN action was studied by analyzing the changes of shale surface structure and chemical groups,wettability,and capillary force.The experimental results showed that HMN could improve the performance of WBDFs in the Xinjiang Oilfeld to inhibit the hydration swelling and dispersion of shale.The plugging and lubrication performance of the WBDFs in the Xinjiang Oilfield were also enhanced with HMN based on the experimental results.HMN had less impact on the rheological and filtration performance of the WBDFs in the Xinjiang Oilfield.In addition,HMN significantly prevented the decrease of shale strength.The potential mechanism of HMN was as follows.The chemical composition and structure of the shale surface were altered due to the adsorption of HMN driven by electrostatic attraction.Changes of the shale surface resulted in significant wettability transition.The capillary force of the shale was converted from a driving force of water into the interior to a resistance.In summary,hydrophobic nanoparticles presented afavorable application potential for WBDFs.

关键词： Hydrophobic nanoparticle Wetting alteration Wellbore stability water-based drilling fluids Shale

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A new environmentally friendly water-based drilling fluids with laponite nanoparticles and polysaccharide/polypeptide derivatives

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Petroleum Science 2022年第6期19卷 2959-2968页

作者： Xin-Liang Li Guan-Cheng Jiang Yi Xu Zheng-Qiang Deng Kai Wang College of Chemistry and Chemical Engineering Southwest Petroleum UniversityChengdu610500SichuanChina College of Petroleum Engineering China University of Petroleum(Beijing)Beijing102249China drilling Fluid Technology Service Corporation CNPC Chuanqing Drilling Engineering Company LimitedChengdu610051SichuanChina Changqing General drilling Company CNPC Chuanqing Drilling Engineering Company LimitedXi’an710018ShaanxiChina

Considering the increasing environmental pressure,environmentally friendly and high-performance water-based drilling fluids(WBDFs)have been widely studied in recent years to replace the commonly used oil-based drilling fluids(OBDFs).However,few of these drilling fluids are entirely composed of natural materials,which makes it difficult to achieve real environmental protection.Using laponite nanoparticles and various derivatives of natu ral mate rials,including cro sslinked starch,cellulose composite,gelatin ammonium salt,poly-l-arginine,and polyanionic cellulose,a kind of environmentally friendly water-based drilling fluid(EF-WBDF)was built for drilling in environment-sensitive areas.The properties of this EF-WBDF were evaluated by thermal stability tests on rheology,filtration,inhibition,and salt contamination.Besides,biological toxicity,biodegradability,heavy mental content and wheat cultivation tests were conducted to investigate the environmental factor of EF-WBDF.Results showed that EF-WBDF displayed satisfactory thermal resistance up to 150℃,and the rheological properties did not suffer significant fluctuation,showing potential application in high-temperature wells.The optimal rheological model of EF-WBDF was Herschel-Bulkley model.This EF-WBDF performed an eligible filtration of 14.2 mL at 150℃and a differential pressure of 3.5 MPa.This fluid could still maintain colloidal stability after being contaminated by 7.5%NaCl or 0.5%CaC1_(2).Meanwhile,rather low clay swelling degree of 2.44 mm and high shale recovery of more than 95%ensured the inhibitive capability of EF-WBDF.Furthermore,EF-WBDF presented a half maximal effective concentration(EC_(50))of51200 mg/L and a BOD/COD ratio of 47.55%,suggesting that EF-WBDF was non-toxic and easily biodegradable.The wheat cultivated in EF-WBDF could grow healthily,beneficial for reducing the adverse impact on ecological environment.The formed EF-WBDF has a promising future for drilling in environment-sensitive and high-temperature areas.

关键词： water-based drilling fluids Environmental protection High-temperature resistance Laponite nanoparticles Natural materials Wellbore stability

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Hydrophobic Small-Molecule Polymers as High-Temperature-Resistant Inhibitors in water-based drilling fluids

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Fluid Dynamics & Materials Processing 2023年第7期19卷 1775-1787页

作者： Xuyang Yao Kecheng Liu Zenan Zhou Jun Zhou Xianbin Huang Tiemei Lu Yongsheng Yu He Li Engineering Technology Research Institute of Xinjiang Oilfield Company PetroChinaKaramay834000China School of Petroleum Engineering China University of Petroleum(East China)Qingdao266580China

water-based drilling fluids can cause hydration of the wellbore rocks,thereby leading to instability.This study aimed to synthesize a hydrophobic small-molecule polymer(HLMP)as an inhibitor to suppress mud shale hydration.An infrared spectral method and a thermogravimetric technique were used to characterize the chemical composition of the HLMP and evaluate its heat stability.Experiments were conducted to measure the linear swelling,rolling recovery rate,and bentonite inhibition rate and evaluate accordingly the inhibition performance of the HLMP.Moreover,the HLMP was characterized through measurements of the zeta potential,particle size distribution,contact angles,and interlayer space testing.As confirmed by the results,the HLMP could successfully be synthesized with a favorable heat stability.Furthermore,favorable results were found for the inhibitory processes of the HLMP on swelling and dispersed hydration during mud shale hydration.The positively charged HLMP could be electrically neutralized with clay particles,thereby inhibiting diffusion in the double electron clay layers.The hydrophobic group in the HLMP molecular structure resulted in the formation of a hydrophobic membrane on the rock surface,enhancing the hydrophobicity of the rock.In addition,the small molecules of the HLMP could plug the spaces between the layers of bentonite crystals,thereby reducing the entry of water molecules and inhibiting shale hydration.

关键词： water-based drilling fluids hydrophobic polymers shale inhibitor temperature resistance

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Preparation of an environmentally friendly emulsion-type lubricant based on crude rice bran wax

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Petroleum 2019年第1期5卷 77-84页

作者： Zhengqiang Xiong Fan Fu Xiaodong Li Yanning Li Beijing Institute of Exploration Engineering Beijing100083China

In this study,crude rice bran wax oil-in-water emulsion(named CRBWE)was prepared by agent-in-water method.The critical factors influencing the sample preparation process were optimized.For instance,the optimum hydrophile-lipophile balance value of compound emulsifier was 12.33–13.40,the content of compound emulsifier was 10 wt%,the emulsification temperature was 70°C–80°C,the agitation speed was 200 rpm,and the emulsification time was 30–45 min.The performances as a lubricant of drilling fluid were also evaluated with respect to lubricity,rheology and filtration loss of CRBWE.The results showed that CRBWE had good lubricity and didn't affect the rheological properties of drilling fluid.For example,when it was added into bentonite dispersion at room temperature with the fraction of 1 wt%,the coefficient of friction of bentonite dispersion dramatically decreased to 0.077,and the coefficient of friction reduced rate was greater than 80%.Overall,these findings indicated that CRBWE would have promising applications as environmental friendly lubricant of drilling fluids to reduce torque and drag in petroleum and natural gas drilling.

关键词： Emulsion-type lubricant Crude rice bran wax Lubricity Biodegradable water-based drilling fluids

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