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

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.

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.

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

Early monitoring of gas influx of drilling fluid in risers during deepwater drilling using Lamb waves

2019 ◽  
Vol 16 (1) ◽  
pp. 25-32
Author(s):  
Wen-Xing Duan ◽  
Cheng-Wen Xiao ◽  
Yong Ai ◽  
Yi Xin ◽  
Lei Zhu
Keyword(s):  
Lamb Waves ◽  
Drilling Fluid ◽  
Deepwater Drilling

scholarly journals Zwitterionic Polymer P(AM-DMC-AMPS) as a Low-Molecular-Weight Encapsulator in Deepwater Drilling Fluid

2017 ◽  
Vol 7 (6) ◽  
pp. 594 ◽  
Author(s):  
Xin Zhao ◽  
Zhengsong Qiu ◽  
Yongjun Zhang ◽  
Hanyi Zhong ◽  
Weian Huang ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Drilling Fluid ◽  
Low Molecular Weight ◽  
Deepwater Drilling ◽  
Zwitterionic Polymer
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