Drilling fluids used for underwater crossings construction by directional drilling method (Part 2. Components and parameters of drilling fluids for the construction of the underwater crossing by applying the method of directional drilling)

2021 ◽  
pp. 26-34
Author(s):  
Z.Z. Sharafutdinov ◽  
◽  
R.A. Kapaev ◽  
I.R. Islamov ◽  
◽  
...  
Keyword(s):  
Drilling Fluids ◽  
Directional Drilling ◽  
Drilling Method

scholarly journals Efficient Removal of Magnetic Contamination from Drilling Fluids - The Effect on Directional Drilling

2020 ◽  
pp. 1-14
Author(s):  
Arild Saasen ◽  
Benny Poedjono ◽  
Geir Olav Ånesbug ◽  
Nicholas Zachman
Keyword(s):  
Magnetic Particles ◽  
Barents Sea ◽  
Drilling Fluid ◽  
Drilling Fluids ◽  
Directional Drilling ◽  
The North ◽  
Uncertainty Calculation ◽  
The North Sea ◽  
Drilling Rigs ◽  
Sea Area

Abstract Magnetic debris in a drilling fluid have a significant influence on the ability of the drilling fluid to maintain its function. Down hole logging can suffer from poor signal to noise ratios. Directional drilling in areas close to the magnetic North Pole, such as in the Barents Sea, Northern Canada or Russia can suffer because of magnetic contamination in the drilling fluid. Magnetic particles in the drilling fluid introduce additional errors to the magnetic surveying compared to those normally included in the ellipsoid of uncertainty calculation. On many offshore drilling rigs, there are mounted ditch magnets to remove metallic swarf from the drilling fluid. These magnets normally only remove the coarser swarf. In this project, we use a combination of strong magnets and flow directors to significantly improve the performance of the ditch magnets. This combination, together with proper routines for cleaning the ditch magnets, significantly helps to clean the drilling fluid. Through the combined use of flow directors and ditch magnets, it was possible to extract more than five times as much magnetic contamination from the drilling fluid as normal compared with other proper ditch magnet systems. This is verified by comparing the ditch magnet efficiencies from two drilling rigs drilling ERD wells in the North Sea area. In the paper, it is discussed how the accuracy of directional drilling and well position effected by various interferences can be improved by the use of a drilling fluid with minimal effect to the MWD measurement.

scholarly journals Evaluation of the Construction and Investment Process of a High-Pressure Gas Pipeline with Use of the Trenchless Method and Open Excavation Method. Analytic Hierarchy Process (AHP)

2019 ◽  
Vol 11 (8) ◽  
pp. 2438
Author(s):  
Kwast-Kotlarek ◽  
Hełdak
Keyword(s):  
High Pressure ◽  
Gas Pipeline ◽  
Average Score ◽  
Directional Drilling ◽  
Economic Costs ◽  
Horizontal Directional Drilling ◽  
Analytic Hierarchy ◽  
Multi Criteria Evaluation ◽  
Drilling Method ◽  
Investment Process

The study presents the application of multi-criteria analysis, i.e., the Analytic HierarchyProcess (AHP), for the evaluation of investments related to the realisation of a high-pressure gaspipeline. The authors evaluated the realisation of the gas pipeline with the use of alternativemethods: the trenchless Horizontal Directional Drilling (HDD) method and the open excavationmethod, based on the example of the construction of a high-pressure gas pipeline DN1000. Sectionslocated in naturally valuable areas on the route of the pipeline Wierzchowice-Kiełczów (Poland)were analysed, on the section from the valve station in Czeszów to the Kiełczów node. The researchconsidered the following criteria: technical costs, economic costs, social costs, and environmentalcosts. The sum of these partial estimations is the “total cost” of the investment. Research revealedthat the technical costs of the open excavation method are in all cases higher than the technologicalcosts of the trenchless method during the realisation of a gas pipeline (in the AHP analysis, theyreceive an average score of −4 or −3, compared to a score of −2 for the HDD method). On the otherhand, the economic costs are comparable, with a slight advantage for the HDD method. The overallscore for the open excavation method obtained with use of the AHP multi-criteria evaluation is, fordifferent variants, approximately −19, while the evaluation of the realisation of a gas pipeline withuse of the Horizontal Directional Drilling method gives a score from −15 to −10, depending on thesection.

Mud-Sealing Cement System Delivers Notable Cement Bond Log Result in a Challenging Offshore Horizontal 4 ½-in Liner: A New Technology Case Study

2021 ◽  
Author(s):  
Degaul Nana Nzoutchoua ◽  
Carl R. Johnson ◽  
Armelle Boukoulou Mounguele ◽  
Chibuzor Onyia ◽  
Giovanni Rizza ◽  
...  
Keyword(s):  
Best Practices ◽  
Oil And Gas ◽  
New Technology ◽  
Drilling Fluids ◽  
Directional Drilling ◽  
Drilling Tool ◽  
Cement System ◽  
Liner System ◽  
The Impact ◽  
Pipe Rotation

Abstract A 1575m [4922-ft] offshore horizontal 4-½-in. liner cemented using a mud-sealing cement system (MSCS) resulted in an outstanding cement bond log result. The decision to use the MSCS was taken after realizing that four offset liners, previously cemented using conventional cement systems, did not yield acceptable cement bond log results despite following oil and gas cementing industry best practices, including pipe rotation. This paper documents a comparison of six offset horizontal liners, focusing on the impact of the MSCS technology. The paper focuses on several 4-½-in. liners in the same field. The wells were drilled by a similar rig and had similar well profiles. The drilling bit, directional drilling tool, drilling fluids system, logging tool, centralizer type and pumping sequences were comparable across all wells. In addition, the logging company performing the cement bond log evaluation was not the same company performing the cementing service. After the first MSCS-cemented well, the subsequent well used a conventional cement system to isolate the 4-½-in. liner and tighten the cementing best practices. This was initiated to irrefutably confirm the impact of MSCS technology on the quality of cement bond log recorded on the earlier well. The cement bond log recorded from the well isolated with MSCS is easily identified among the six comparison wells even though the cementing operation faced several well challenges, includinga single dart liner system implementation (for all liners), which can promote the intermixing of slurry with fluid ahead while travelling down the pipemud losses in the drilling phase, which resulted in a reduction of the displacement rate to control ECD during cement placement. The bond log results of the other wells were qualified as poor or fair, even though significant precautions were taken to optimize zonal isolation. These efforts included batch mixing the spacer and slurry, using more than one centralizer per casing joint, and implementing pipe rotation during pre-job circulation and job execution when the torque limit allowed. This multi-well comparison based on field results brings solid evidence of the MSCS technology interacting with the residual layer of nonaqueous fluid (NAF) when well conditions reach or exceed the practical normative limitations for mud removal. This in-situ interaction generates a viscous paste that positively impacts the bond log response and bolsters the isolation between zones of interest. The result has yielded a step forward in the provision of a dedicated barrier technology for horizontal or highly deviated sections.

Modeling of Annular Pressures in Horizontal Directional Drilling

2004 ◽  
Author(s):  
Samuel T. Ariaratnam ◽  
Richard Stauber ◽  
Bruce Harbin
Keyword(s):  
Hydraulic Fracturing ◽  
Drilling Fluid ◽  
Pressure Effects ◽  
Soil Conditions ◽  
Drilling Fluids ◽  
Fluid Composition ◽  
Directional Drilling ◽  
Limited Information ◽  
Horizontal Directional Drilling ◽  
Wide Range

Horizontal Directional Drilling (HDD) is an established trenchless construction method for the installation of underground utilities and pipelines. Subsequently, the method is becoming widely accepted as a cost-effective alternative to traditional open-cut construction. However, the occurrence of hydraulic fracturing, resulting in the migration of drilling fluid to the surface has placed the HDD process under scrutiny, especially when being considered for environmentally sensitive projects. Hydraulic fracturing results from an excess buildup of fluidic pressure within the borehole. Models have been developed to predict borehole pressures; however, there is limited information available on the relationship between drilling returns and fluid composition to these pressures. A research program was undertaken to model and determine flow characteristics for drilling returns under a variety of soil conditions and bore penetration rates. Nine soil samples were gathered based on the Unified Soil Classification System (USCS) and their respective rheological properties were obtained for different drilling fluids and target slurry densities. This paper presents, as an example, a comparison and analysis of the predicted borehole pressures of clayey-sand (SC) soil in a large directional drill rig application and provides recommendations for contractors when attempting installations in various geological formations. The pressure effects of pipe eccentricity within a borehole were analyzed using a computer model. The result of this research is a simplified approach for predicting downhole fluid pressures for a wide range of project parameters that can be used as a guide to minimize the occurrence of hydraulic fracturing.

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