Setting Free the Bear: The Challenges and Lessons of the Ursa A-10 Deepwater Extended-Reach Well

Gradishar, John Robert; Ugueto, Gustavo; Oort, Eric van

doi:10.2118/163525-pa

Cited by 14 publications

(4 citation statements)

References 7 publications

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“…Using the same mud density in these zones as in the remainder of the well will result in an increased overbalance. Lost circulation into the depleted reservoir will increase as the overbalance rises [10]. The circulation losses in some wells, which are drilled in depleted reservoirs, are about thousands of barrels [11].…”

Section:  Losses In Depleted Reservoirmentioning

confidence: 99%

Experimental Study to Investigate the Effect of Polyacrylamide Gel to Reduce the Lost Circulation

Al-Delfi

Almahdawi

Mukhtar

et al. 2023

IJCPE

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One of the challenging issues encountered during drilling operations is the lost circulation. Numerous issues might arise because of losses, such as wasting of time and higher drilling cost. Several types of lost circulation materials have been developed and are being used to limit mud losses and avoid associated issues. Each solution has benefits and drawbacks. In this study, a core flooding test was performed to study the effectiveness of polyacrylamide (PAM) granular gel on the reduction of the circulation lost. One common type of fracture characteristic is fractures with tips, commonly known as partially open fracture (POF). However, PAM gel therapy in POFs received little attention in prior research. Models of partly open fractures were built using a cylindrical core. A series of processes are performed on a core to get a POF model. Overall, the PAM gel can decrease plug permeability, making it a useful material for lost circulation. The results indicate that the Polyacrylamide granular gel can decrease the permeability up to 193 times.

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Section:  Losses In Depleted Reservoirmentioning

confidence: 99%

Experimental Study to Investigate the Effect of Polyacrylamide Gel to Reduce the Lost Circulation

Al-Delfi

Almahdawi

Mukhtar

et al. 2023

IJCPE

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“…On the contrary, a slight downward trend in V total oil is found when P b goes upward from 1 MPa to 3 MPa. It is also worth mentioning that the absolute permeability k has no influence on V total oil due to the reason that this property has no correlation with Equation (8).…”

Section: Quantification Of the Effect Of Reservoir Properties Onmentioning

confidence: 99%

“…With regard to deep-water oil and gas field development, in 2002, the A-10 deep-water ERW was drilled in the Ursa Oilfield in the Gulf of Mexico basin, with a vertical depth of 5486 m and a horizontal displacement of 6096 m. The well was drilled from the Ursa tension leg platform (TLP) to the yellow sand reservoir in the Ursa Prince section of the Mars Ursa basin [8]. Brazil had drilled 47 ERWs in the Peregrino Oilfield from 2010 to 2017, with an average horizontal displacement of 1419 m [9].…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of the Effect of Reservoir Properties on Oil Production from the Low-Permeability Formation by Extended Reach Wells

Li¹

2023

Geofluids

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At present, extended reach wells (ERWs) are widely applied on oil and gas exploitation in numerous reservoirs around the globe, and this is attributed to their superiority in the development of marginal oil and gas fields and cost-effectiveness. Identifying the effects of reservoir properties on production is significant to the operation of ERWs for oil and gas extraction. This work utilizes numerical modeling techniques to simulate the application of ERWs in low-permeability formations. The impacts of low permeability on the oil production and the pressure distribution of the reservoirs with different formation properties are analyzed, and the simulation results of the oil exploitation by ERWs are compared with the oil production and pressure distribution of that by horizontal wells (HWs). A test scheme is designed to analyze the effect of reservoir properties on oil extraction through ERWs and quantify the sensitivity of oil production to reservoir properties. The reservoir properties of formation rock compressibility, formation fluid compressibility, initial reservoir pressure, reservoir saturation pressure, formation porosity, and absolute permeability are studied through 66 ERW cases. The results illustrate that low permeability leads to a fast decrease of oil production rates and significantly uneven pressure distribution. The pressure is lower at the center of the ERW but is higher at both ends of the ERW, while the pressure is evenly distributed along the horizontal well in the HW cases. In addition, the oil production is in direct proportion with the initial reservoir pressure, formation rock compressibility, formation porosity, and formation fluid compressibility but is in an inverse ratio with the reservoir saturation pressure. Furthermore, the initial reservoir pressure has the largest impact on both the total cumulative oil production driven out by natural energy and the cumulative oil production after the development of ten years by natural energy; on the contrary, the absolute permeability has no effect on the total cumulative oil production driven out by natural energy.

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“…In 2013 Vestavik [30] proposed the use of double-wall drill pipe drilling technology to increase the borehole extension limit. In 2014, Gradishar [31] pointed out the influence of various factors on the extension limit of drilling through the drilling history of an offshore extended-reach well. In 2018, Xin Li [32] proposed an optimal design principle and control method for the subjective and objective constraints of the bare-hole extension limit for large displacement horizontal wells with the goal of improving the bare-hole extension limit.…”

Section: Introductionmentioning

confidence: 99%

Drill String Mechanics and Extension Capacity of Extended-Reach Well

Liu

Tian

Xu³

et al. 2023

Teh. vjesn.

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For the design and construction of the extended-reach well, the ultimate elongation capacity of the extended-reach well was studied. Given the drilling practice of extended-reach well, the extension limit prediction criterion of extended-reach well is established. In this paper, based on the drilling practice of extended-reach well, by the finite element method, the gap element method and the dynamic finite element method of the whole drill string, static analysis model of the extended-reach well and the mechanicsꞌ analysis model of drill string vibration are established. The frictional resistance condition and strength condition of the limit extension of the extendedreach well are solved respectively, and the extended limit prediction criterion of the extended-reach well is established. The software was prepared based on the model and theory, the model and software were validated with the example of drilling, and the average error of the calculated value is 6.94% when compared with the measured values in the field. It can meet the needs of drilling engineering and study of the extension capability of the extended-reach wells.

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Setting Free the Bear: The Challenges and Lessons of the Ursa A-10 Deepwater Extended-Reach Well

Cited by 14 publications

References 7 publications

Experimental Study to Investigate the Effect of Polyacrylamide Gel to Reduce the Lost Circulation

Experimental Study to Investigate the Effect of Polyacrylamide Gel to Reduce the Lost Circulation

Numerical Simulation of the Effect of Reservoir Properties on Oil Production from the Low-Permeability Formation by Extended Reach Wells

Drill String Mechanics and Extension Capacity of Extended-Reach Well

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