First Installation of 16-in. Solid Expandable Liner Solves Shallow Drilling Problems; Opens New Doors for Hole Size Preservation

Shaikh, Ali; Duran, Roberto; Abouelnaaj, Khaled; Fritsch, Jerry; Andrews, Stacey Kyle; Baker, R. V.

doi:10.2118/166701-ms

Cited by 5 publications

(1 citation statement)

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“…The 406.4-mm (16 in.) SETs were first applied in four shallow wells and successfully solved the shallow well problems such as shallow gas, unstable formations, and high-pressure fluid flows [8]. Metcalfe et al [9] tested the process of expanding with rotatory expansion mandrel in the casings.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Analysis of Solid Expandable Tubular and Its Applications in Tahe Oilfield

Tang

Zhou

et al. 2015

Arab J Sci Eng

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For ultra-deep horizontal wells in Tahe Oilfield in China, the solid expandable tubular (SET) technology was applied in the buildup section to isolate unstable mud stone with clays above the pay zone. This technology satisfies the requirements of geological water avoidance, and a larger hole size is adopted in the pay zone. This paper proposed a finite element dynamic model to analyze the expansion of the SET, and the impacts of the following factors on the expansion force required for the expandable tubular were analyzed: yield strength of the tubular material, solid tubular expansion ratio, the coefficient of friction between the expansion cone and the tubular, the angle of the expansion cone, movements velocity of the expansion cone, and DLS (dogleg severity). The calculation results indicate that a higher expansion ratio, a higher yield strength, and a higher friction coefficient of the SET result in a larger expansion force to different degrees, whereas the other factors have little effect on the expansion force. The dynamic expansion force calculation model established in this paper is consistent with the actual conditions, and the simulation calculation results can be applied to provide theoretical guidance for SET expansion operations.

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Section: Introductionmentioning

confidence: 99%

Dynamic Analysis of Solid Expandable Tubular and Its Applications in Tahe Oilfield

Tang

Zhou

et al. 2015

Arab J Sci Eng

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High Performance Solid Expandables for Deepwater

Bullock

Ruzic

Perez

et al. 2014

Day 1 Wed, September 10, 2014

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High pressure, high temperature (HPHT) wellbore designs are addressing deeper targets using more complex well paths. Solid expandable tubular (SET) systems have evolved to enable these wells to reach these deeper objectives with the planned wellbore diameter. Recent advancements in expandables have increased the mechanical ratings and maximum temperature of specific SET system sizes.High-performance (HP) SET systems significantly increase pressure ratings in three sizes for a range of applications: 7-5/8 in. (for 9-3/8 in., 9-5/8 in., 9-7/8 in., and 10-1/8 in. base casings), 8-5/8 in. (for 10-3/4 in. base casing), and 11-3/4 in. (for 13-3/8 in., 13-5/8 in., and 14 in. base casings). Compared to standard SET systems, the collapse rating doubled for the 7-5/8-in. and 8 5/8-in. systems and tripled for the 11-3/4 in system. These HP systems increase the options available for designing HPHT wellbores. This paper will review GOM case histories for both drilling and repair applications.A high-temperature SET system has also been developed to support drilling in deeper, higher temperature formations. Developed initially as a 7-5/8 in. SET system, it has a 450°F (230°C) rating that is 50°F (10°C) more than standard SET. The increase provides operators with a critical additional casing string deep in the wellbore.These advances ensure that SET technology will play an increasingly prominent role in HPHT wellbore construction as operators optimize wellbore casing designs and reduce risk.

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Laboratory Evaluation of Sealing Wide Fractures Using Conventional Lost Circulation Materials

et al. 2014

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Preventing or mitigating fluid losses caused by the presence of natural fractures is a major challenge faced by operators when drilling exploratory wells in the Barents Sea. Natural fractures widths vary significantly which makes it difficult to design treatments using conventional lost circulation materials (LCM's). Different solutions have been used to overcome this problem, such as chemical sealants, hydratable LCM's pills, rigid-plugs and cement. This study intends to expand the usage of conventional LCM's in sealing wide fractures.Experimental evaluation of LCM's is a crucial step prior to field application. Currently, particle plugging apparatus is often used to evaluate LCM's performance using straight slots or tapered slots by applying a constant pressure and measuring the fluid loss. However, fluid loss values are not a good measure of the formed seal integrity. Therefore, another means of evaluating LCM's performances is required. In this work LCM sealing efficiency was defined as the seal/bridge maximum breakdown pressure. The tests were conducted on a fit-for-purpose apparatus designed to evaluate the performance of LCM's by measuring the sealing efficiency under high pressures (10,000 psi) and temperatures.This paper presents an extensive laboratory evaluation to investigate the feasibility of sealing wide fractures using conventional LCM's. The ability of different LCM's in sealing fractures was evaluated using a set of tapered slot sizes up to 2000 microns fracture width. Four different types of conventional LCM with 13 different particle sizes (D50) and one new foam wedge based LCM were investigated. A total of 200 tests were run to investigate the effect of different parameters on the overall performance of both conventional and unconventional LCM. These parameters include LCM's type, concentration, tapered slot size, particle size distribution (PSD), temperature, and injection rate. Ground walnut shell showed a superior performance in sealing large fractures (sealing pressure up to 2200 psi) when used as a concentrated pill. Microscopic studies revealed that this performance is due to the ability of these materials to deform and plug fractures under elevated pressure. However, selecting the right LCM concentration is critical to avoid screen out at the fracture openings. Unconventional LCM used in this study was able to seal fractures up to 5 mm where conventional LCM failed to seal. Laboratory procedures to evaluate high fluid loss squeezes by means of hesitation squeeze were developed and recommended injection rates were determined. This research highlights the different factors affecting LCM sealing efficiency and seal integrity. A full understanding of the factors contributing to successful treatments for sealing fractures is very important. Appropriate laboratory evaluation of LCM treatments is an important step prior to field application. The authors believe that a better understanding of these factors will improve the way LCM treatments are designed.

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First Installation of 16-in. Solid Expandable Liner Solves Shallow Drilling Problems; Opens New Doors for Hole Size Preservation

Cited by 5 publications

References 0 publications

Dynamic Analysis of Solid Expandable Tubular and Its Applications in Tahe Oilfield

Dynamic Analysis of Solid Expandable Tubular and Its Applications in Tahe Oilfield

High Performance Solid Expandables for Deepwater

Laboratory Evaluation of Sealing Wide Fractures Using Conventional Lost Circulation Materials

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