Application of Innovative High-Temperature High-Density Oil-Based Drilling Fluid Technology in the Efficient Exploration and Development of Ultra-Deep Natural Gas Resources in West China

2016 ◽  
Author(s):  
Li Long ◽  
Xu Xianguang ◽  
Zhu Jinzhi ◽  
Cheng Rongchao ◽  
Wang Jianhua ◽  
...  
Keyword(s):  
High Temperature ◽  
Natural Gas ◽  
Drilling Fluid ◽  
High Density ◽  
West China ◽  
Efficient Exploration ◽  
Exploration And Development

Drilling Fluid Development and Performance Evaluation of Deep and Ultra-Deep High-Density Saturated Brine

2012 ◽  
Vol 524-527 ◽  
pp. 1382-1388
Author(s):  
Ping Quan Wang ◽  
Yang Bai ◽  
Gang Peng ◽  
Zhi Wei Qian
Keyword(s):  
High Temperature ◽  
Drilling Fluid ◽  
High Density ◽  
Deep Drilling ◽  
Fluid System ◽  
Experimental Conditions ◽  
Performance Factors ◽  
Complex Formulation ◽  
Deep Well ◽  
Processing Optimization

Due to the high temperature , great pressure and complex lithology of super-deep well bottom, there exist such problems such as high solid concentration, multiple but inaccurate treating chemicals, complex formulation with instability of drilling fluid system, resulting in a frequent occurrence of underground complex accident and a waste of a lot of manpower and material resources. Therefore, based on the analysis of performance factors of ultra-deep drilling fluid system, the approach of regulating water based drilling fluid properties of super-deep well has been found. Moreover, through screening and processing optimization of treating chemicals of ultra-deep well by single-factor method, three sets of anti-high-density and anti-high-temperature saturated brine drilling fluid systems with few kinds of treating chemicals, concise and simplified system, including: ① saturated brine drilling fluid with anti-temperature 180 °C and density 2.40 g/cm3 ; ② saturated brine drilling fluid with anti-temperature 200 °C and density 2.40g/cm3; ③ saturated brine drilling fluid with anti-temperature 220 °C and density 2.40g/cm3 . After the the evaluation of the overall performance of these three systems under respective experimental conditions, the results show that all of these systems have such advantages as good and strong rheology, water loss building capacity, inhibition, lubricity and blocking ability, etc, which could meet the requirements of ultra-deep drilling under different circumstances.

scholarly journals Performance Prediction of a Turbodrill Based on the Properties of the Drilling Fluid

Machines ◽  
2021 ◽  
Vol 9 (4) ◽  
pp. 76
Author(s):  
Delong Zhang ◽  
Yu Wang ◽  
Junjie Sha ◽  
Yuguang He
Keyword(s):  
High Temperature ◽  
Performance Prediction ◽  
Drilling Fluid ◽  
High Viscosity ◽  
High Density ◽  
Fluid Viscosity ◽  
Two Phase ◽  
Geometry Model ◽  
Multi Stage ◽  
Fluid Properties

High-temperature geothermal well resource exploration faces high-temperature and high-pressure environments at the bottom of the hole. The all-metal turbodrill has the advantages of high-temperature resistance and corrosion resistance and has good application prospects. Multistage hydraulic components, consisting of stators and rotors, are the key to the turbodrill. The purpose of this paper is to provide a basis for designing turbodrill blades with high-density drilling fluid under high-temperature conditions. Based on the basic equation of pseudo-fluid two-phase flow and the modified Bernoulli equation, a mathematical model for the coupling of two-phase viscous fluid flow with the turbodrill blade is established. A single-stage blade performance prediction model is proposed and extended to multi-stage blades. A Computational Fluid Dynamics (CFD) model of a 100-stage turbodrill blade channel is established, and the multi-stage blade simulation results for different fluid properties are given. The analysis confirms the influence of fluid viscosity and fluid density on the output performance of the turbodrill. The research results show that compared with the condition of clear water, the high-viscosity and high-density conditions (viscosity 16 mPa∙s, density 1.4 g/cm3) will increase the braking torque of the turbodrill by 24.2%, the peak power by 19.8%, and the pressure drop by 52.1%. The results will be beneficial to the modification of the geometry model of the blade and guide the on-site application of the turbodrill to improve drilling efficiency.

scholarly journals Thermoresponsive Bentonite for Water-Based Drilling Fluids

Materials ◽  
2019 ◽  
Vol 12 (13) ◽  
pp. 2115 ◽  
Author(s):  
Dong ◽  
Pu ◽  
Ren ◽  
Zhai ◽  
Gao ◽  
...  
Keyword(s):  
High Temperature ◽  
Drilling Fluid ◽  
Environmental Scanning Electron Microscopy ◽  
High Density ◽  
Drilling Fluids ◽  
Isothermal Adsorption ◽  
Mud Cake ◽  
Water Based ◽  
Recovery Behavior ◽  
Increasing Temperature

As an important industrial material, bentonite has been widely applied in water-based drilling fluids to create mud cakes to protect boreholes. However, the common mud cake is porous, and it is difficult to reduce the filtration of a drilling fluid at high temperature. Therefore, this paper endowed bentonite with a thermo response via the insertion of N-isopropylacrylamide (NIPAM) monomers. The interaction between NIPAM monomers and bentonite was investigated via Fourier infrared spectroscopy (FTIR), isothermal adsorption, and X-ray diffraction (XRD) at various temperatures. The results demonstrate that chemical adsorption is involved in the adsorption process of NIPAM monomers on bentonite, and the adsorption of NIPAM monomers accords with the D–R model. With increasing temperature, more adsorption water was squeezed out of the composite when the temperature of the composite exceeded 70 °C. Based on the composite of NIPAM and bentonite, a mud cake was prepared using low-viscosity polyanionic cellulose (Lv-PAC) and initiator potassium peroxydisulfate (KPS). The change in the plugging of the mud cake was investigated via environmental scanning electron microscopy (ESEM), contact angle testing, filtration experiments, and linear expansion of the shale at various temperatures. In the plugging of the mud cake, a self-recovery behavior was observed with increasing temperature, and resistance was observed at 110 °C. The rheology of the drilling fluid was stable in the alterative temperature zone (70–110 °C). Based on the high resistance of the basic drilling fluid, a high-density drilling fluid (ρ = 2.0 g/cm3) was prepared with weighting materials with the objective of drilling high-temperature formations. By using a high-density drilling fluid, the hydration expansion of shale was reduced by half at 110 °C in comparison with common bentonite drilling fluid. In addition, the rheology of the high-density drilling fluid tended to be stable, and a self-recovery behavior was observed.

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