Rotary Liner Drilling for Depleted Reservoirs

Sinor, L.A.; Tybero, Pal; Eide, O.; Wenande, Bill

doi:10.2523/39399-ms

Cited by 3 publications

(1 citation statement)

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“…Earth subsidence, a direct result of this deformation, has been measured in a number of soft, compactible reservoirs. Well‐known examples of this kind include the Ekofisk and Valhall Fields in the North Sea, where rates of sea‐bottom subsidence were as high as 38 cm/year (Zoback and Zinke 2002) and 25 cm/year (Sinor et al 1998), respectively, and the Wilmington Field in California, where total surface subsidence reached 9.5 m (Dusseault, Bruno and Barrera 2001). Similar phenomena have been observed and reported in environmental science and hydrology; for instance, Lewis and Schrefler (1998) discussed several cases of earth subsidence due to water withdrawal.…”

Section: Introductionmentioning

confidence: 99%

Simulation of two‐phase fluid flow through compactible reservoirs

Grechka

Soutter²

2005

Geophysical Prospecting

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A B S T R A C TFluid-flow simulators used in the oil industry model the movement of fluids through a porous reservoir rock. These simulators either ignore coupling between the flow and concurring deformation of the solid rock frame or take it into account approximately, in the so-called loose or staggered-in-time mode. In contrast to existing simulators, the one we describe here fully couples two-phase (oil and water) flow to subsurface deformation and simultaneously accounts for all relevant physical phenomena. As such, our flow simulator inherently links time-dependent fluid pressures, saturations, permeabilities and flow velocities to stresses in the whole subsurface. These stresses relate to strains through the non-linear theory of elasticity, allowing us to model timelapse changes in seismic velocities and anisotropy. The velocity variations manifest themselves in time shifts and reflection amplitudes that are conventionally measured from 4D seismic data. Changes in anisotropy produce time-dependent shear-wave splitting that can be used for monitoring the horizontal stresses.

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Section: Introductionmentioning

confidence: 99%

Simulation of two‐phase fluid flow through compactible reservoirs

Grechka

Soutter²

2005

Geophysical Prospecting

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Development Well Drilling with Sacrificial Drill Pipe Completion in Fracture Basement Reservoir: Case Study from a Field in Corridor Block, South Sumatra Basin Indonesia

Permana

Darmadi

Hamid

et al. 2020

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

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X gas field is located in the Corridor block of Onshore South Sumatra, Indonesia and operated by ConocoPhillips Grissik Ltd. (CPGL). The field was first discovered in 1994 and started production in 2001. In terms of reserves, X field is the second largest in the Corridor. All production comes from fractured igneous (granite, granodiorite) and metamorphic (meta conglomerate, quartzite, phyllite and marble) rocks of the pre-Tertiary basement. To date, eight wells have been drilled during the exploration and development program. The most recent development well was the X-8, which was drilled in 2017. The X-8 well was designed to enter the top of the reservoir structure at a location where the seismic amplitude exhibited dimming. Based on analysis of the seismic and well productivity, dimming amplitudes are indicative of faults and fractures. Historically, exploration, appraisal and development wells drilled in the field did not experience any wellbore stability issues. During drilling of the X-8, wellbore stability and collapse caused significant problems and resulted in the sidetracking of the well three times. Prior to the drilling, it was recognized that depleted reservoir conditions may result in wellbore stability issues, but the rock strength was determined to be sufficient to overcome any wellbore collapse. It would only be necessary to overcome the pressure difference, and this could be done using managed pressure drilling (MPD). Although MPD was implemented successfully, the wellbore collapsed during drilling and before the completion string could be run. Ultimately, the well was completed using the drill string since standard completions were impossible under the time constaints. An after-action review of X-8 was conducted, and hypotheses were generated to explain the wellbore stability issue in this well. The review included fault interpretation uncertainty, lithology competency, reservoir lithology and geomechanics. Based on this work, two explanations were suggested as the main cause of wellbore collapse. The first explanation is that the top of the basement consists of a weathered zone resulting from exhumation in the Mesozoic. The weathered zone consists of rock material generated by both physical and chemical weathering. The second explanation is shear failure due to reservoir depletion. Both explanations are supported by well data, seismic attributes and current reservoir pressure. In the end, with an understanding of the potential failure mechanism, the last sidetrack was completed by leaving the drill string inside the hole to enable the well to produce. The learnings suggest that drilling through fracture basement reservoir is challenging and with depletion, the reservoirs can be nearly impossible to drill. Casing or liner drilling may be the only solution to successfully drill these types of wells and produce the hydrocarbons.

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Simultaneous Drill and Case Technology-Case Histories, Status and Options for Further Development

Hahn

Gestel

Fröhlich

et al. 2000

IADC/SPE Drilling Conference

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Drilling liner technology has become a standard for entering depleted reservoirs in areas of the North Sea and Southeast Asia and interest continues to increase for use of drilling liners to overcome other drilling problems. Marketing analyses have shown that further development of drilling liner technology and application has been rated with high priority. Based on experience gathered during the last five years, this paper covers possible further Drilling Liner applications, new challenges, and requirements for new systems. "Drill and Case" systems will be introduced and benefits shown by means of case histories of jobs carried out in Norway and Indonesia. Introduction Drilling Liner technology seeks to drill and case the well in one run. Over the last five years, typical Drilling Liner runs were carried out in applications where the target depth was just a few meters away, but could not safely be reached with standard drilling bottom hole assemblies (BHA's). Drilling ahead with standard BHA's risked loss circulation, hole collapse and potentially losing the BHA, drill string and hole section. The success of the entire well was dependent on drilling just a few meters ahead. Drilling Liner technology has helped solve these problems in Norway and Indonesia—enabling savings of over 1.0 mm US$ per well. A typical Drilling Liner application occurs when drilling into depleted reservoirs—a situation, which will become more evident and critical in the future. Former drilling technology has required the use of intermediate casing strings and/or set cement plugs as a means to achieve this. Using Drilling Liners, it often takes only a few hours to drill the liner to target depth and overcome existing drilling problems. The Drilling Liner was standardized to enter depleted reservoirs, but questions challenging the use of this system in other applications continue to arise. These new applications include long distance (ERD) drilling, deep water/shallow water flows, unconsolidated sands or time critical unstable formations. Market analysis has shown that further development of "Case and Drill" systems are rated within the top level of desired drilling technologies industry-wide. On the other hand, although existing systems have been on the market for some years, they are sometimes not fully recognized as potential cost savers or problem solvers. Case and Drill Simultaneously. Various liner drilling systems and casing drilling systems are on the market. Figure 1 refers to liner and casing drilling concepts. Using casing drill systems, the operator can change the drilling BHA several times, whilst the casing stays in the hole. Due to the fact that the casing reaches to surface, the BHA can be retrieved with jointed pipe or wire line. Under-reamers or extendible bits enlarge the hole to allow the casing to follow. The casing must be designed to withstand all drilling loads from the bottom of the well up to surface.

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Rotary Liner Drilling for Depleted Reservoirs

Cited by 3 publications

References 0 publications

Simulation of two‐phase fluid flow through compactible reservoirs

Simulation of two‐phase fluid flow through compactible reservoirs

Development Well Drilling with Sacrificial Drill Pipe Completion in Fracture Basement Reservoir: Case Study from a Field in Corridor Block, South Sumatra Basin Indonesia

Simultaneous Drill and Case Technology-Case Histories, Status and Options for Further Development

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