Aphron-based Drilling Fluid: Novel Technology for Drilling Depleted Formations in the North Sea

2003 ◽  
Author(s):  
Craig C. White ◽  
Adrian P. Chesters ◽  
Catalin D. Ivan ◽  
Sven Maikranz ◽  
Rob Nouris
Keyword(s):  
North Sea ◽  
Drilling Fluid ◽  
The North ◽  
Novel Technology ◽  
The North Sea

Field Testing of a Cationic Polymer/Brine Drilling Fluid in the North Sea

1992 ◽  
Author(s):  
T.W. Beihoffer ◽  
F.B. Growcock ◽  
C.K. Deem ◽  
D.S. Dorrough ◽  
R.P. Bray ◽  
...  
Keyword(s):  
North Sea ◽  
Drilling Fluid ◽  
Field Testing ◽  
Cationic Polymer ◽  
The North ◽  
The North Sea

Wellbore Stabilizing Technology Enhances Cementing Efforts in the North Sea

2021 ◽  
Author(s):  
Agnieszka Ilnicka ◽  
Antonio Bottiglieri ◽  
Maja Jaskiewicz ◽  
David Kulakofsky
Keyword(s):  
North Sea ◽  
Drilling Fluid ◽  
Cement Slurry ◽  
Weak Zone ◽  
Two Fluids ◽  
The North ◽  
Zonal Isolation ◽  
The North Sea ◽  
Isolation Requirements ◽  
Cement Integrity

Abstract North Sea lithologies are often complex creating a difficult environment to deliver effective zonal isolation with standard cementing practices. With ever-present weak, fractured, and unconsolidated formations, the practice of fully lifting heavier cement up the annular gap between the formation and the casing or liner often times compromises the formation and the cement integrity. Wellbore Stabilizing (WBS) technology has been shown capable of providing zonal isolation under these difficult conditions. A cementing spacer has been developed that incorporates WBS technology providing a simple way to deliver the technology in front of any cement job, without compromising the cement integrity or requiring any last-minute slurry design or redesign. By separating the placement of the WBS technology from the cement itself, the cement slurry can be designed with the sole focus being on the interval's zonal isolation requirements. On Askepott wells in the Norwegian part of the North Sea, the Nordland weak zone is encountered after drilling out the 30-inch shoe from the Oseberg Vest H template. Cement back to the seafloor is required when cementing the 20-in casing in these 26-in. holes. Prior to the introduction of the WBS technology, pressure had been observed on the D-annulus, hinting at a lack of sufficient cement circulation. With assistance from this new WBS spacer, pressure is no longer observed in the D-annulus indicating the cement is now being circulated back inside of the conductor string. The WBS spacer has also been used successfully ahead of cement across the production interval in wells where losses were typically expected, and again full returns were observed. Normally cement spacers are utilized to separate the drilling fluid from the cement as these two fluids are normally incompatible with each other and to help push the drilling fluid out of the well so the annulus may be completely filled with cement. If the drilling fluid is not successfully displaced from the annular space, the zonal isolation intended by the primary cement job is usually less than ideal. In addition to these standard functions in preparation for cementing operations, this specialized WBS spacer also can prevent loss of cement to the formation.

Automated Drilling-Fluids-Measurement Technique Improves Fluid Control, Quality

2021 ◽  
Vol 73 (11) ◽  
pp. 53-54
Author(s):  
Chris Carpenter
Keyword(s):  
Ambient Temperature ◽  
North Sea ◽  
Drilling Fluid ◽  
Pressure Sensors ◽  
Drilling Fluids ◽  
Sampling Point ◽  
Electrical Stability ◽  
The North ◽  
Fluid Properties ◽  
The North Sea

This article, written by JPT Technology Editor Chris Carpenter, contains highlights of paper SPE 204041, “Automatic Drilling-Fluids Monitoring,” by Knut Taugbøl, SPE, Equinor, and Bengt Sola and Matthew Forshaw, SPE, Baker Hughes, et al., prepared for the 2021 SPE/IADC International Drilling Conference and Exhibition, originally scheduled to be held in Stavanger, 9–11 March. The paper has not been peer reviewed. The complete paper presents new units for automatic drilling-fluids measurements with emphasis on offshore drilling applications. The surveillance of fluid properties and the use of data in an onshore operations center is discussed. The authors present experiences from use of these data in enabling real-time hydraulic measurements and models for automatic drilling control and explain how these advances can improve safety in drilling operations and drilling efficiency. Introduction An operator has worked with different suppliers for several years to find and develop technology for automatic measurements of drilling-fluid properties. In the described study, methods for measuring parameters such as viscosity, fluid loss control, pH, electrical stability, particle-size distribution, and cuttings morphology and mineralogy were all fitted into a flow loop in an onshore test center. These tests, however, were all performed with prototype equipment. Since then, work has continued to optimize equipment for offshore installations, made for operating in harsh environments and requiring limited maintenance to provide continuous and reliable data quality. The fluid-measuring technique presented in this paper is based on rheology measurement through a pipe rheometer and density measurements through a Coriolis meter. This rheometer measures at ambient temperature. Dual DP is the terminology that refers to pressure measurements between two differential pressure sensors. The dual-DP pipe rheometer is set up with high-accuracy pressure transducers to measure pressure loss inside the straight section of the pipe rheometer. By varying the flow rate through pipes of different dimensions, a rheology profile at varying shear rates can be calculated. Field Implementation Installation of a unit begins with a rig survey conducted in concert with the drilling contractor to find the best location and sampling point. Fluid normally is taken from the charge manifold for the mud pumps, ensuring measurement of the fluid going into the well. The first installation in the North Sea of an automatic fluid-monitoring (AFM) unit was in 2017. This unit is still operational, sending data to an onshore support center. Fig. 1 shows such a unit installed offshore. The AFM unit has only one movable part, the monopump supplying drilling fluid through the unit. Once the dual-DP rheometer was factory-acceptance-tested in the yard, it was sent offshore to be commissioned and verified on a fixed installation in the North Sea. The related data presented in the complete paper were acquired in the field while drilling the 355-m, 8½-in. section with 1.35-SG low-equivalent-circulating-density oil-based drilling fluid, with drilling conducted at approximately 4000 m measured depth. The mud engineer onboard was requested to perform rheology checks on a viscometer at equal ambient temperature to the AFM so that the results could be compared; the AFM also measures rheology at ambient temperature.

The Ship Canal between the North Sea and the Baltic

1891 ◽  
Vol 32 (828supp) ◽  
pp. 13224-13224
Keyword(s):  
North Sea ◽  
The North ◽  
The North Sea ◽  
The Baltic

Long Term Changes in Wind and Wave Climate on the North Sea

1991 ◽  
Author(s):  
Frank M. J. Hoozemans
Keyword(s):  
North Sea ◽  
Wave Climate ◽  
The North ◽  
Long Term Changes ◽  
The North Sea

Detecting plankton shifts in the North Sea: a new abrupt ecosystem shift between 1996 and 2003

2014 ◽  
Vol 502 ◽  
pp. 85-104 ◽  
Author(s):  
G Beaugrand ◽  
X Harlay ◽  
M Edwards
Keyword(s):  
North Sea ◽  
The North ◽  
Ecosystem Shift ◽  
The North Sea

Induction of micronuclei and other nuclear abnormalities in blue mussels Mytilus edulis after 1-, 2-, 4- and 8-day treatment with crude oil from the North Sea

Ekologija ◽  
2010 ◽  
Vol 56 (3) ◽  
pp. 124-131 ◽  
Author(s):  
Janina Baršienė ◽  
Laura Andreikėnaitė ◽  
Anne Bjornstad
Keyword(s):  
Crude Oil ◽  
Mytilus Edulis ◽  
North Sea ◽  
Day Treatment ◽  
Nuclear Abnormalities ◽  
Blue Mussels ◽  
The North ◽  
The North Sea
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