Successful Application of a Distance-to-Boundary Technology Under Tough Drilling and Reservoir Conditions

Salim, Diogo; Samaroo, Rajeev; Barbosa, Jose Eustaquio Pampuri; Silva, Charles Santos; Guedes, Ana Beatriz Felício

doi:10.2118/143752-ms

Cited by 4 publications

(2 citation statements)

References 5 publications

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“…The second part of the project consisted of a real case study of a high angle well drilled in a sandstone turbidites field in offshore Campos basin where Well Placement technique was used (Salim et al, 2011). Figure 3 indicates the seismic cross-section along the original well plan.…”

Section: Simulated Productivity Response Of a Real Geosteering Case Smentioning

confidence: 99%

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Innovative Drilling Methodology by Integrating an Advanced Simulation Approach for Recovery Optimization of Horizontal Wells

Salim

Couto

Alves

et al. 2015

Day 4 Wed, December 09, 2015

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After the progressive advancement of the drilling technologies, such as mud motors and afterward rotary steerable systems, the successful execution of high angle wells became a common practice in the oil industry. Although the associtated costs have much superior magnitude when compared to the ones related to vertical wells, the production factor is normaly improved by multiple times, turning such trajectory design very suitable. However achiving the key performance objectives, e.g., consistent and effective net pay interval along the horizontal section, can be extremely difficult. There are many geological and geophysical reasons, such as the lateral discontinuities of the reservoirs and intrinsic seismic uncertainties. To overcome such challenge, Well Placement technique is used to interactively position the well based on geological and seismic criteria together with real time Logging-While Drilling data. Despite the fact of covering the technical disciplines of drilling, geology, petrophysics and geophysics, most Well Placement approaches rarely take into consideration reservoir engineering aspects when geosteering horizontal wells.Therefore the project objectives were to evaluate the impacts in the productivity generated by the geometrical changes in the trajectory through numerical reservoir simulation. The research work was then divided into two parts. The first one was the creation of a representative 3D synthetic reservoir model where numerical simulations were applied for each trajectory design. A detailed sensitivity analysis was made by comparing the results among the different trajectory cases in order to identify the relationship between well positioning and its productivity response.The second part consisted of a real geosteering case study. Around both planned and executed wellbores, it was created a detailed reservoir model enhanced by LWD inputs. Afterwards, reservoir simulations were performed in order to evaluate the impacts caused by trajectory variations, demonstrating the expected productivity results versus the actual.This research study shows that there is a productivity impact in all reservoir fluids when well trajectory is subjected to geometrical variations. Thus it reinforces that predictions related to reservoir production should not only be performed on planning stage, but most importantly during or after well conclusion using relevant inputs, such as the actual well path, LWD logs, and formation pressures while drilling, which all combined provides an enhanced reservoir model, and so a more accurate forecast analysis.

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Section: Simulated Productivity Response Of a Real Geosteering Case Smentioning

confidence: 99%

“…The second part of the project consisted of a real case study of a high angle well drilled in an offshore sandstone field where Well Placement methodology was used (Salim et al, 2011). As expected, the executed trajectory had significant geometrical differences compared to planned one.…”

Section: Introductionmentioning

confidence: 96%

Innovative Drilling Methodology by Integrating an Advanced Simulation Approach for Recovery Optimization of Horizontal Wells

Salim

Couto

Alves

et al. 2015

Day 4 Wed, December 09, 2015

View full text Add to dashboard Cite

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Maximizing Recovery by Integrating an Advanced Reservoir Simulation Approach into the Drilling Process of Horizontal Wells

Salim

Couto

Alves

et al. 2015

Day 3 Wed, September 16, 2015

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The successful drilling of horizontal wells is extremely difficult, mainly due to lithological discontinuities and seismic uncertainties. To overcome such challenge, Well Placement technique is used to interactively position the well based on geological and seismic criteria together with LWD measurements. While covering drilling, geology and geophysics, most Well Placement approaches rarely consider reservoir engineering aspects. This paper presents an innovative methodology that integrates reservoir engineering into Well Placement workflow to improve well's productivity performance.The applied method is based on advanced 3D modelling, where by means of numerical reservoir simulations, productivity predictions are performed not only on the planned well but also at the executed trajectory. To increase prediction accuracy, a refined gridding with variable cell size technique is applied to enhance pressure and saturation sensitivity. The level of precision is improved by using LWD measurements, such as most precise formation pressure, permeability near wellbore and remote boundary mapper technology that provides a detailed reservoir structure based on formation resistivity contrast.This methodology was employed in a real case study of a horizontal well drilled in an offshore sandstone field in Brazil. As common occurrence in Well Placement operations, the executed trajectory had significant geometrical differences compared to the planned one. For both planned and executed wells, a detailed reservoir model was created using the inputs of LWD measurements. Numerical simulations were then applied to both wells in order to evaluate the impacts caused by the trajectory variations, showing the expected productivity results versus the actual ones obtained at the drilling operation. The results demonstrated indeed a major productivity impact in all reservoir fluids when a well trajectory is subjected to geometrical changes. However, only through the use of this integrated approach could such impact be quantified, since the traditional Well Placement methodology cannot determine the effects on the productivity response based only on the geological and petrophysical aspects.The work delivers a novel ability to construct optimal horizontal wells not only by including conventional Well Placement technique, using geological and geophysical criteria, but also by introducing into the workflow an advanced numerical simulation approach. Such integration allows the operator to predict the impacts on the productivity as the trajectory is being changed, and the actual reservoir geometry and its properties are determined by LWD measurements.

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Openhole Multistage Acid-Fracturing Increases Hydrocarbon Production in Deep Naturally Fractured Carbonate Horizontal Wells in Ta-zhong Gasfield of Tarim Basin, West China

Che

Zhang

Wang

et al. 2015

SPE/IATMI Asia Pacific Oil &Amp; Gas Conference and Exhibition

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The naturally fractured carbonate reservoir of Ta-zhong has been developed for over ten years due to new technologies. Since 2008, a program was undertaken to test openhole multistage acid-fracturing technology in the Ta-zhong gasfield to determine if deep fractured carbonate reservoir could be effectively developed by horizontal wells. This paper will introduce the challenges including the segregated completion through optimized design and individual acid-fracturing treatment through simulation, production history of stimulated horizontal wells and the comparisons with offset wells. Ta-zhong carbonate reservoir is buried from 5000m to 7000m TVD with low matrix permeability and porosity, the hydrocarbon is mainly stored in the interconnected natural fractures and vugs, so a novel segregated completion method was gradually formed during the development from the reservoir description.To avoid circulation loss or blowout during drilling horizontal well, the horizontal interval was usually close to the top of reserves with natural fractures and vugs by control while drilling. The reserves and numbers of segments will be distinguished by 3D seismic, well course and stress direction, and then the distances between reserves and horizontal interval was calculated through horizontal well track superimposed on the seismic profile, each section divided by openhole packers need special acid-fracturing technique to get sufficient height or length to communicate the hydrocarbon reserves. Simulation work gives the results which pad and ground cross-linked acid multi-alternative injection fracturing is favorable for longer length, and pad acid-fracturing is favorable for higher height. The performances of frac fluid and ground cross-linked acid are also showed in the paper, the residual viscosity of gel fluid is greater than 150mPa·s in the conditions of 140? and 170s Ϫ1 shear, and ground cross-linked acid's is more than 200mPa·s in the conditions of 120? and 170s Ϫ1 shear.Production comparisons showed that stimulated horizontal wells extended the production life of development wells and improved development effectiveness. Several years' production history analysis of

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Successful Application of a Distance-to-Boundary Technology Under Tough Drilling and Reservoir Conditions

Cited by 4 publications

References 5 publications

Innovative Drilling Methodology by Integrating an Advanced Simulation Approach for Recovery Optimization of Horizontal Wells

Innovative Drilling Methodology by Integrating an Advanced Simulation Approach for Recovery Optimization of Horizontal Wells

Maximizing Recovery by Integrating an Advanced Reservoir Simulation Approach into the Drilling Process of Horizontal Wells

Openhole Multistage Acid-Fracturing Increases Hydrocarbon Production in Deep Naturally Fractured Carbonate Horizontal Wells in Ta-zhong Gasfield of Tarim Basin, West China

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