Economic Analysis of Lost Circulation Events to Optimize the Drilling Process in Basra Oil Fields, Iraq

2019 ◽  
Author(s):  
Husam H. Alkinani ◽  
Abo Taleb T. Al-Hameedi ◽  
Shari Dunn-Norman ◽  
Ralph E. Flori ◽  
Mortadha T. Alsaba ◽  
...  
Keyword(s):  
Economic Analysis ◽  
Oil Fields ◽  
Drilling Process ◽  
Lost Circulation

Economic Analysis of Lost Circulation Events to Optimize the Drilling Process in Basra Oil Fields, Iraq

2019 ◽  
Author(s):  
Husam H. Alkinani ◽  
Abo Taleb T. Al-Hameedi ◽  
Shari Dunn-Norman ◽  
Ralph E. Flori ◽  
Mortadha T. Alsaba ◽  
...  
Keyword(s):  
Economic Analysis ◽  
Oil Fields ◽  
Drilling Process ◽  
Lost Circulation

scholarly journals Using of surface back pressure with water based mud in managed pressure drilling technique to solve lost circulation problem in Southern Iraqi Oil Fields

2021 ◽  
Vol 11 (3) ◽  
pp. 28-47
Author(s):  
Batool Abdullah Dhayea ◽  
Faleh. H. M. Almahdawi ◽  
Sinan I. M. Al-Shaibani
Keyword(s):  
Water Injection ◽  
Pressure Profile ◽  
Injection Rate ◽  
Back Pressure ◽  
Oil Fields ◽  
Drilling Process ◽  
Lost Circulation ◽  
Managed Pressure Drilling ◽  
Wellbore Pressure ◽  
Circulation Problem

Many drilling problems are encountered continuously while drilling oil wells in the southern Iraqi oil fields. Many of these problems are ineffectively handled resulting in a longer non-productive time. This study aims to identify the formations such as Dammam, and Hartha formations،diagnose potential problems and provide the solution for lost circulation problem. After conducting a comprehensive study on the subject and based on available data, previous studies and some information, the managed pressure drilling (MPD) method was the best technique to solve this problem. This process may use various techniques including control of back pressures .Thus, reducing the risk and control the costs of drilled wells, which have narrow pressure window by managing the wellbore pressure profile.  The well plan software program provided by Halliburton Company was used, this software is based on a database and data structure common to many of Landmark’s drilling applications. Mud used with  various injection rates  to choose the rate that provides the conditions to achieve the best drilling process, as it using mud weights of (8.8 -8.7 ) ppg  and applied a surface back pressure (50 psi). Depending on specifications of second hole the optimal injection rate was chosen using the (hydraulics) program. As a results, rate of water injection (850) gpm, is the best  which it  provides a good efficient cutting transport ratio (CTR), which means high  stability and preventing formation damage in addition to controlling in  mud losses

Lost Circulation Minimization Strategy Applied While Drilling Challenging Profile Well on Salym Group of Oil Fields

2015 ◽  
Author(s):  
Andrey Kharitonov ◽  
Svetlana Pogorelova ◽  
Ali Bakici ◽  
Alexander Antonov ◽  
Anton Khomutov
Keyword(s):  
Oil Fields ◽  
Lost Circulation

Modern Rheological Analysis of Drilling Fluids

2013 ◽  
Author(s):  
Anne Schulz ◽  
Heike Strauß ◽  
Matthias Reich
Keyword(s):  
Drilling Fluid ◽  
Hysteresis Loops ◽  
Hydraulic Calculation ◽  
Drilling Fluids ◽  
Drilling Process ◽  
Rheological Analysis ◽  
Lost Circulation ◽  
Solids Transport ◽  
Drilling Technology ◽  
The Cost

Rheological analysis provides a good comprehension of the deformation and flow of substances under different stress conditions. The complex composition of the drilling fluid and the versatile functions makes rheological studies here indispensable as well as in other scientific fields like the food industry and material science. In spite of adding many high-quality additives to the drilling fluids, problems still occur, such as barite-sag, lost circulation, change of mud properties (particularly at high and very low temperature), solids transport. Others are often mentioned as reasons for increasing the cost of wells. The areas in which rheology plays an important role in drilling technology will be highlighted in this article. The reason, why the characterization with the Fann-viscometer alone is not enough for a detailed view on rheology will be focused on. In addition, measuring methods which are able to provide detailed information about gel strength, consistency, gel destruction, gel build up process and yield point have been investigated. A short overview of the basics of rheology is given. In this article, novel procedures will be shown on the basis of flow curve, hysteresis loops, amplitude sweep and 3-interval-thixotropy-test (3ITT). With these procedures, deeper knowledge about the drilling fluid system can be obtained. Implementing these procedures and considering their results in hydraulic calculation programs or taking them into account by the design of drilling fluids, can reduce costs and lead to safer drilling process in general.

RESERVOIR GEOMECHANICS APPLIED TO DRILLING AND COMPLETION PROGRAMS IN CHALLENGING FORMATIONS: NORTHWEST SHELF, TIMOR SEA, NORTH SEA AND COLOMBIA

2000 ◽  
Vol 40 (1) ◽  
pp. 507
Author(s):  
D.A. Castillo ◽  
D. Moos
Keyword(s):  
Stress Field ◽  
North Sea ◽  
Sedimentary Basins ◽  
Wellbore Stability ◽  
Tensile Failure ◽  
Drilling Process ◽  
Natural Fractures ◽  
Fracture Permeability ◽  
Lost Circulation ◽  
Timor Sea

It has become increasingly clear to the oil and gas community that earth stresses at depth in sedimentary basins have a profound effect on wellbore stability. Drilling problems frequently occur due to severe mechanical instabilities at the borehole wall where stress amplification has exceeded the strength of the rock. This is because the rock surrounding the hole must support the stress previously supported by the material removed in the drilling process. Drilling problems associated with lost circulation often occur where the borehole has intersected critically-stressed natural fractures that are inherently prone to high fracture permeability. In order to design a drilling and completion program that eliminates or minimises these mechanical instabilities in the borehole, it is essential to understand the interaction between the stress field, pore pressure, natural fractures, rock strength, mud weight, and borehole trajectory.In some cases wellbore performance can be maximised by selecting an optimal trajectory through the reservoir that can be drilled near balanced or under-balanced to minimise the formation damaging effects of mud infiltration, while other trajectories may require more aggressive drilling parameters. In these situations a well-constrained stress field is essential for determining the appropriate mud window to control compressive failure leading to the development of wellbore breakouts and, at the same time, prevent catastrophic tensile failure leading to formation breakdown or fluid losses through natural fractures.This paper serves to illustrate how a well-constrained geomechanical model can be used to address a suite of drilling and completion problems. Case studies reviewed include; wellbore stability and completion practices in extended reach wells (North West Shelf), wellbore stability in vertical and deviated wells (North Sea); drilling and completions in complex geological environments associated with steeply-dipping bedded shales (Colombia), and lost circulation in highly fractured regions (Timor Sea).

scholarly journals Estimation of Wellbore and Formation Temperatures during the Drilling Process under Lost Circulation Conditions

2013 ◽  
Vol 2013 ◽  
pp. 1-11 ◽  
Author(s):  
Mou Yang ◽  
Yingfeng Meng ◽  
Gao Li ◽  
Yongjie Li ◽  
Ying Chen ◽  
...  
Keyword(s):  
Heat Exchange ◽  
Oil And Gas ◽  
Exchange Process ◽  
Drilling Process ◽  
Formation Temperature ◽  
Well Drilling ◽  
Lost Circulation ◽  
Deep Well ◽  
Completion Process ◽  
Oil And Gas Resources

Significant change of wellbore and surrounding formation temperatures during the whole drilling process for oil and gas resources often leads by annulus fluid fluxes into formation and may pose a threat to operational security of drilling and completion process. Based on energy exchange mechanisms of wellbore and formation systems during circulation and shut-in stages under lost circulation conditions, a set of partial differential equations were developed to account for the transient heat exchange process between wellbore and formation. A finite difference method was used to solve the transient heat transfer models, which enables the wellbore and formation temperature profiles to be accurately predicted. Moreover, heat exchange generated by heat convection due to circulation losses to the rock surrounding a well was also considered in the mathematical model. The results indicated that the lost circulation zone and the casing programme had significant effects on the temperature distributions of wellbore and formation. The disturbance distance of formation temperature was influenced by circulation and shut-in stages. A comparative perfection theoretical basis for temperature distribution of wellbore-formation system in a deep well drilling was developed in presence of lost circulation.

Use Of Liner Drilling Technology As A Mitigation To Lost Circulation InThe Faja De Oro (Golden Lane) Oil Fields Offshore Veracruz, Mexico

2013 ◽  
Author(s):  
L. F. Aguilera Naveja ◽  
G.R. Inciarte Fermin ◽  
R. Gaminos Ramos ◽  
Steven M. Rosenberg ◽  
Marco A. Dominguez M.
Keyword(s):  
Oil Fields ◽  
Lost Circulation ◽  
Drilling Technology

Application of Ultrafine Weighting Materials in High-Density Oil-Based Drilling Fluid Technology

2015 ◽  
Vol 814 ◽  
pp. 338-344 ◽  
Author(s):  
Yan Ye ◽  
Wen Hua An ◽  
Da Yin ◽  
Qing Wen Zhang ◽  
Lei Li ◽  
...  
Keyword(s):  
Drilling Fluid ◽  
Fine Powder ◽  
High Density ◽  
Suspension Stability ◽  
Drilling Fluids ◽  
Powder Particle Size ◽  
Drilling Process ◽  
Well Drilling ◽  
Base Oil ◽  
Lost Circulation

High-density oil-based drilling fluid already was considered as one of the most effective technologies during the HTHP Ultra-deep well drilling process. The weighting materials sag such as barite sag, however, always occurred because of the density contrast between the base oil and the weighting material, and hence sag can result in excessive torque, lost circulation and many other problems. This study applied three kinds of ultra-fine powder (particle size≤4μm), which are new weighting materials, to replace the common API barite (particle size10~70μm). The different kinds of high-density oil-based drilling fluids, which weighted with micronized barite, micronized ilmenite, manganese tetraoxide and API barite, were prepared and evaluated separately in lab. The performance data showed that compared with conventional weighting materials, the application of ultrafine powder technology could greatly optimize the rheology of high-density oil-based drilling fluids (ρ ≥ 2.3 g/cm3), reduce the amount of emulsifiers about 50% and dramatically enhance the dynamic suspension-stability of the system, Furthermore, OBM drilling fluids weighted with ultrafine weighting materials almost presented lower viscosity, shear force and sedimentation rate, which will meet more severe requirements of ultra-deep complex well drilling.

scholarly journals Drilling in Karstified Carbonates: Early Risk Detection Technique

2020 ◽  
Author(s):  
Danil Maksimov ◽  
Alexey Pavlov ◽  
Sigbjørn Sangesland
Keyword(s):  
Real Time ◽  
Barents Sea ◽  
Rock Properties ◽  
Drilling Process ◽  
Drilling Mud ◽  
Online Tool ◽  
Low Contrast ◽  
Lost Circulation ◽  
Drilling Data ◽  
Mud Loss

Abstract Heterogeneous nature and complex rock properties of carbonate reservoirs makes the drilling process challenging. One of these challenges is uncontrolled mud loss. Caves or a system of cavities could be a high-risk zone for drilling as the mud losses cannot always be controlled by conventional methods, such as mud weight (MW) / equivalent mud weight (ECD) optimization, or by increasing concentration of lost circulation material (LCM) in the drilling mud. Seismic-based detection of such karstification objects is inefficient due to relatively small size, various shapes and low contrast environment. In this paper we, based on drilling data from the Barents sea, analyzed possible patterns in real-time drilling data corresponding to drilling through karstification objects. These patterns can serve as real-time indicators of zones with higher risk of karsts and can be used as an online tool for decision support while drilling in karstified carbonates.

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