scholarly journals High Temperature Sealing Performance of Novel Biodegradable Colloidal Gas Aphron (CGA) Drilling Fluid System

2021 ◽  
Vol 64 (6) ◽  
pp. 331-339
Author(s):  
Wenxi ZHU ◽  
Xiuhua ZHENG
Keyword(s):  
High Temperature ◽  
Drilling Fluid ◽  
Fluid System ◽  
Colloidal Gas Aphron ◽  
Sealing Performance

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.

Study of Drilling Fluid System of Resisting the High Temperature of 220 Degrees

2013 ◽  
Vol 753-755 ◽  
pp. 130-133
Author(s):  
Hui Hong Luo ◽  
Ze Hua Wang ◽  
Yu Xue Sun ◽  
Han Jiang
Keyword(s):  
High Temperature ◽  
Drilling Fluid ◽  
Fluid Loss ◽  
Borehole Stability ◽  
Fluid System ◽  
Well Drilling ◽  
Deep Well ◽  
Materials Used ◽  
Loss Control ◽  
Determine System

Focus on the high temperature rheological stability and the fluid loss control of resistance to high temperature drilling fluid system, further determine system formula and the formula of the high temperature drilling fluid system should be optimized. Eventually, a kind of organo-silica drilling fluid system of excellent performance which is resistant to high temperature of 220 degrees has been developed, and the system performances have been evaluated. The high temperature-resistant organo-silica drilling fluid system is of good shale inhibition, lubricity and borehole stability. The fluid loss is low and the filter cake is thin and tight, which can effectively prevent bit balling. The sand-carrying ability is good and the rheological property is easy to control. The performances of drilling fluid remain stable under high salinity and the system can resist the pollution of 6%NaCl and 0.5%CaC12. The materials used in this system are non-toxic, non-fluorescent and suitable for deep well drilling.

scholarly journals Study on the Rheological Properties of Ultra-High Temperature CGA Drilling Fluids

2021 ◽  
Author(s):  
Wenxi Zhu ◽  
Xiuhua Zheng
Keyword(s):  
High Temperature ◽  
Rheological Properties ◽  
High Temperatures ◽  
Drilling Fluid ◽  
Drilling Fluids ◽  
Underbalanced Drilling ◽  
Deep Wells ◽  
Colloidal Gas Aphron ◽  
Oil Gas ◽  
Ultra High Temperature

Colloidal gas aphron (CGA) drilling fluids are a kind of environmentally-friendly underbalanced drilling technique, which has attracted more attention in depleted reservoirs and other low-pressure areas. With the shortage of global oil/gas resources, drilling has gradually shifted to high-temperature and deep wells. Hence, a study on the ultra-high temperature rheology properties of CGA fluids is lacking and urgently needed. In this study, a novel CGA drilling fluid system was prepared by modified starch and amino acid surfactant, and rheological properties after 120-300°C aged was investigate. Results show that: (1) Herschel-Bulkley model is the preferred model to predict CGA drilling fluid at ultra-high temperatures; (2) It was proved that CGA drilling fluid is a high-quality drilling fluid with extremely high value of LSRV and shear thinning property within 280°C. Compared to the traditional XG-based CGA drilling fluid, the improvement of LSRV at ultra-high temperatures is a significant advantage of EST-based CGA drilling fluid which is conducive to carrying cuttings and sealing formation pores.

New Environmentally Safe High-Temperature Water-Based Drilling-Fluid System

1999 ◽  
Vol 14 (03) ◽  
pp. 185-189 ◽  
Author(s):  
C.J. Thaemlitz ◽  
A.D. Patel ◽  
George Coffin ◽  
Lee Conn
Keyword(s):  
High Temperature ◽  
Drilling Fluid ◽  
Fluid System ◽  
High Temperature Water ◽  
Water Based ◽  
Environmentally Safe ◽  
Temperature Water

Research on Water-Based Drilling Fluid for Super Depth and Ultra-High-Temperature Horizontal Wells in Tarim Basin

2017 ◽  
Vol 730 ◽  
pp. 231-236
Author(s):  
Yue Zhi Wang ◽  
Chun Zhi Luo ◽  
Yi Di Wang
Keyword(s):  
High Temperature ◽  
Environmental Protection ◽  
Tarim Basin ◽  
Evaluation System ◽  
Drilling Fluid ◽  
Carbonate Reservoir ◽  
Development Economic ◽  
Fluid System ◽  
Temperature Resistance ◽  
Water Based

One area of northern Tarim Basin in China is carbonate reservoir, and the reservoir is between 6600 ~ 6900 m. The bottom hole static temperature is close to 170°C, the ECD of pore pressure is 1.1 ~ 1.15 g/cm3. In order to improve the development economic benefit, reservoir need to adopt horizontal well development. Water-based drilling fluid is required to resistant high temperatures and high salt, prevent leakage of limestone reservoir fracture, control the density, protect the reservoir from damage, and has good rheological properties. For old poly-sulfide drilling fluid system, through the indoor evaluation system of various treatment agent and temperature resistance, authors found that by using polymer viscosities, loss of water and temperature resistance of lubricant can reach 140°C. Therefore authors developed the temperature stability agent and high temperature resistant lubricants. This paper introduces the mechanism of the treatment, and evaluates the performance of synthetic products. Aiming at the shortage of the lubricant, authors develop a blister, crosslinking, good environmental protection and maintain water-based lubricant characteristics of resistance to high temperature lubricant. It has good environmental protection ability. Through the evaluation, it has good lubricity and temperature resistance. By introducing the resistance temperature resistance to high temperature drilling fluid system, and after the application in well H9-10H, new drilling fluid system was carried out, well meet the requirements of drilling engineering.

Experimental Research on the New Foam Drilling Fluid System

2013 ◽  
Vol 781-784 ◽  
pp. 2857-2860
Author(s):  
Hai Min Xu ◽  
Lin Zhao ◽  
Hua Wu ◽  
Wan Long Huang ◽  
Dong Ma ◽  
...  
Keyword(s):  
High Temperature ◽  
High Salinity ◽  
Oil Pollution ◽  
Drilling Fluid ◽  
Experimental Result ◽  
Fluid System ◽  
Compound A ◽  
Foaming Agent ◽  
New Type ◽  
Foam Drilling

Based on the formation characteristics of high temperature (above130°C ) and multi-salt, we optimize several blowing agent monomers to compound a new type of foaming agent, and screen out the new foam stabilizer to determine the new ebonite foam drilling fluid system. In the laboratory, we evaluated its resistance to high temperature, salt and oil pollution. And we made a research on its rheological characteristics of the foam and the behavior of high salinity. The experimental result shows that the ebonite foam drilling fluid has much more foam, longer stable time, significant effect of the resistance to high temperature, salt and oil pollution and has good sand-carrying ability, which can effectively prevent the occurrence of loss circulation and meet the requirement of rock carrying and wellbore stabilization.

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