A New Generation Associative Polymer Extends Temperature Stability Of Deepwater Drilling Fluid

2011 ◽  
Author(s):  
Robert P. Schlemmer ◽  
Gary Phoon
Keyword(s):  
Drilling Fluid ◽  
Temperature Stability ◽  
Deepwater Drilling ◽  
Associative Polymer ◽  
New Generation

Experimental Evaluation of Separation Methods for a Riser Dilution Approach to Dual Density Drilling

2009 ◽  
Author(s):  
John Shelton ◽  
John Rogers Smith ◽  
Anuj Gupta
Keyword(s):  
Emulsion Stability ◽  
Drilling Fluid ◽  
Feed Stream ◽  
Separation System ◽  
Qualitative Comparison ◽  
Deepwater Drilling ◽  
Drilling System ◽  
The Stability ◽  
Dual Gradient ◽  
Laboratory Centrifuge

A dual gradient, deepwater drilling system based on dilution of riser mud requires economically separating the riser mud into a low density dilution fluid and a higher density drilling fluid. This study investigated the practicality of accomplishing this separation using hydrocyclones and centrifuges and examined the possible benefits and efficiency of each. The separation experiments were conducted using a laboratory centrifuge and 2 inch hydrocyclones. The laboratory centrifuge was able to separate the riser mud into near ideal densities for dilution and drilling fluid. However, the dense slurry retained in the centrifuge had lower emulsion stability than the feed stream. The hydrocyclones achieved much less contrast in density between the low and high density discharges, but consistently resulted in a beneficial increase in the stability of the mud emulsion in all of the flow streams and had more desirable rheological properties. A qualitative comparison indicates that the hydrocyclone separation system may offer a feasible and desirable alternative to centrifuge separation system.

A New Generation Environment Friendly Water-Based Drilling Fluid and Field Applications

2018 ◽  
Author(s):  
Qi Zhu ◽  
Yong Wang ◽  
Yongqing Zhang ◽  
Zhihe Sun ◽  
Yinghui Wei ◽  
...  
Keyword(s):  
Drilling Fluid ◽  
Environment Friendly ◽  
Water Based ◽  
New Generation

Experimental Study on Critical Displacement for Drill-Conductor Injection during Deepwater Drilling

SPE Journal ◽  
2020 ◽  
Vol 25 (05) ◽  
pp. 2206-2219
Author(s):  
Changbin Kan ◽  
Deli Gao ◽  
Jin Yang
Keyword(s):  
Experimental Data ◽  
Recovery Time ◽  
Field Experiments ◽  
Drilling Fluid ◽  
Injection Rate ◽  
Circulation Rate ◽  
Stress Recovery ◽  
Critical Displacement ◽  
Deepwater Drilling ◽  
Soil Stress

Summary Drill-conductor-jetting technology is a high-efficiency, good-adaptability, and low-cost technology that has been widely applied in deepwater drilling. However, a reaming effect will be produced easily because of jet breaking and bit rotation during the jetting process, and the critical displacement would be notably affected. Also, it will experience a relatively short soaking time after installation because of the requirements of drilling timeliness, which is an important factor on the bearing safety of a conductor. Therefore, it is meaningful to study the influencing factors of construction conditions and establish a model for evaluating the value of critical displacement. In this study, field experiments on critical displacement for simulating the deepwater-drilling conditions were conducted. By analyzing the drilling hydraulic factors, the effects of soil-stress-recovery time, and the injection rate of pipe, the influence laws of different factors were obtained. The results suggest that the critical displacement increases linearly as the circulation rate of the drilling fluid increases, decreases exponentially with the increase of soil-stress-recovery time, and decreases linearly with the increase of injection rate. One model for estimating the critical displacement using experimental data and the least-squares method was proposed. The predictions showed good agreement with experimental data within suitable ranges of models. This work is expected to provide the basis for predicting conductor stability and wellhead-bearing settlement.

Flat-rheology oil-based drilling fluid for deepwater drilling

2017 ◽  
Vol 35 (1) ◽  
pp. 19-24 ◽  
Author(s):  
Xin Zhao ◽  
Zhengsong Qiu ◽  
Jiangen Xu ◽  
Chao Zhao ◽  
Jian Gao
Keyword(s):  
Drilling Fluid ◽  
Deepwater Drilling

Fluoroelastomers

1973 ◽  
Vol 46 (3) ◽  
pp. 619-652 ◽  
Author(s):  
R. G. Arnold ◽  
A. L. Barney ◽  
D. C. Thompson
Keyword(s):  
Developmental Stage ◽  
High Performance ◽  
Vinylidene Fluoride ◽  
Temperature Stability ◽  
Significant Degree ◽  
High Temperature Stability ◽  
Vinyl Ethers ◽  
Carbon Carbon Bond ◽  
Degree Of Stability ◽  
New Generation

Abstract The importance of fluorine in polymer chemistry has been known since the discovery of poly (tetrafluoroethylene) in 1938. Highly fluorinated polymers are very stable and have remarkable resistance to oxidative attack, flame, chemicals, and solvents. This stability has been attributed to the strength of the carbon—fluorine bond compared to that of the carbon—carbon bond, to steric hindrance, and to strong Van der Waals forces. The synthesis of elastomeric polymers containing enough fluorine to impart a significant degree of stability was not achieved until the mid-1950's. Since then a multitude of fluoroelastomers have been reported, but, of these, only certain copolymers of vinylidene fluoride, and fluorosilicone polymers have become commercially important. Recently, however, perfluoroelastomers based on perfluoro (alkyl vinyl ethers) and tetrafluoroethylene have been shown to possess an even greater degree of high temperature stability than do the fluoroelastomers hitherto available. These perfluoroelastomers also are essentially inert to most chemicals and solvents. Copolymers of perfluoro (alkyl vinyl ethers) with partially fluorinated monomers also have been developed that give better flexibility at low temperature. These polymers, now at the developmental stage, appear to be the forerunners of a new generation of superior high-performance elastomers. The discussion that follows will concern firstly, the commercial fluoroelastomers; secondly, those that show commercial promise and might be considered semi-commercial or at the developmental stage but which are available only in limited developmental quantities; and thirdly, those reported in the literature that, so far at least, have been of research interest only. In this last category, polymers will not be included which contain so little fluorine that performance characteristics are not substantially enhanced. For example fluoroprene [poly(2-fluorobutadiene)] and copolymers with nonfluorinated, olefin monomers in which the latter predominate will not be included.

Buoyancy Induced Convection of Riser Gas in Deepwater Drilling Operations

2019 ◽  
Author(s):  
Syed Y. Nahri ◽  
Yuanhang Chen ◽  
Wesley Williams ◽  
Otto Santos ◽  
Ting Sun
Keyword(s):  
Mass Transfer ◽  
Natural Gas ◽  
Drilling Fluid ◽  
Gas Absorption ◽  
Petroleum Engineering ◽  
Drilling Fluids ◽  
Engineering Research ◽  
Deepwater Drilling ◽  
Area Of Interest ◽  
Drilling Operations

Abstract Riser gas migration has been an area of interest since the last three decades due to its importance in gas handling in deepwater drilling operations. A previously conducted full-scale test at LSU Petroleum Engineering Research & Technology Transfer (PERTT) well facility indicates, as contrary to traditional belief, significant migration of dissolved gas taking place even when circulation had ceased. In order to understand whether a reduction in density of the underlying contaminated mud resulting from gas absorption is the contributing factor to the above-mentioned phenomenon, a computational fluid dynamics (CFD) analysis was conducted to study the transport of the gas influx while in solution due to buoyancy induced convective mass transfer and simultaneous diffusion. Simulations performed in this study include the hydrodynamics of the upward moving gas cut mud and simultaneous mass transfer of natural gas into the under-saturated drilling fluid. The parameters studied here are the distance traveled of the gas cut mud and saturation levels in the drilling fluid along the length of the riser. The dense phase behavior was shown to have considerable effects on gas loading capacities which in turn affected the density of the gas cut mud, and at pressures upwards of 5,000 psi, the solubility of a natural gas influx can be seen to be infinite in certain synthetic and oil-based drilling fluids. The rate and extent of mass transfer are dependent on drilling fluid density gradients, which in turn are based on gas influx saturation level. Results obtained from this study can help better comprehend migration phenomena of a dissolved influx in oil-based muds in a riser with the BOP shut in and when circulation has ceased.

Low Impact Drilling Fluid for Deepwater Drilling Frontier

2019 ◽  
Author(s):  
Erna Kakadjian ◽  
April Shi ◽  
Justin Porter ◽  
Prahlad Yadav ◽  
Dennis Clapper ◽  
...  
Keyword(s):  
Drilling Fluid ◽  
Deepwater Drilling
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