Wellbore Re-entries and Repairs: Practical Limits of Cementing New Casing Inside Existing Casing

Stilwell, Shannon Ray; Metcalf, A.S.; Purvis, D. L.

doi:10.2118/124381-ms

All Days 2009

DOI: 10.2118/124381-ms

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Wellbore Re-entries and Repairs: Practical Limits of Cementing New Casing Inside Existing Casing

Shannon Ray Stilwell

A.S. Metcalf²,

D. L. Purvis³

Abstract: Whether a well is being re-entered, after having been abandoned for some time or it simply needs to be repaired to be functional, many operators choose to cement a new smaller outside diameter (OD) casing string inside the old one. Wells previously abandoned have been re-evaluated and found to respond to fracture stimulation using newer methods; however, to accomplish this, the casing string must have integrity. Casing integrity is also of significance to operators in view of state regulations.

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Cited by 2 publications

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Successful Re-entry in a Challenging Drilling Environment: A Case Study

et al. 2010

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Yaqut -1 well (Afiband) is located in Safedkoh Block of Dewan Petroleum Pvt Ltd at about 20km WSW of Taunsa City, district D.G. Khan- Pakistan. Well was originally drilled in 1986. Well was drilled to 2020m, tested and was declared as Dry. Dewan Petroleum, on the basis of seismic data, Re-entered the existing borehole and deepen the same to explore the targets as Lower Cretaceous (Sand Bodies), Lower Cretaceous Sand and Jurassic Limestone. There were big challenges to face before making well usable for evaluation and testing purposes. These challenges included Installation of Wellhead, drilling of cement plugs and cement squeezing of 307m (Selective) perforations in total 792m zone against four different horizons, Drilling of 1356m of 6” hole, conducting wireline logs, running in 5” Liner and successfully cementing it against loss zones. Another challenge was of severe losses because of under-hydrostatic pore-pressure regime/ profile. Detailed evaluation of cement slurry designs of offset wells, where there was poor cementation history; a long debate was opened between well services companies. Discussion included nine possible options, and on the basis of SWOT Analysis one with “Ultra- Light” cement slurry was selected. This paper discusses in detail the strategy of Installing wellhead, Drilling cement plugs & squeezing-off long interval of perforations and their pressure test, along with strategy of overcoming drilling challenges, Centralization of Liner and landing the same successfully and discussion of different 5” Liner Cement Slurry design options. Furthermore it will show lab results, subsequent study results and will outline different steps used in carrying out the design, the execution and evaluation of the results of successful operations, which resulted in a restoration of high productivity.

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Successful Re-entry in a Challenging Drilling Environment: A Case Study

et al. 2010

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Case Histories: Overcoming Lost Circulation During Drilling and Primary Cementing Operations Using an Environmentally Preferred System

2011

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Partial or total lost circulation is prevalent in the Permian Basin of West Texas during many drilling and cementing operations. Whether losses are due to highly vugular or cavernous intervals or due to low fracture gradients, the problem occurs over the entire region. The common practices for fighting these losses are foamed mud sweeps, foamed cements, lost circulation pills and high-viscosity gel spacers containing lost circulation materials. This paper presents case histories representing more than 100 wells in which a new environmentally preferred system has been employed. Specifically, instances during drilling are discussed where partial to total losses in returns have occurred and have been restored by pumping 40 to 50 bbls of this new material. These same wells after restoring circulation resume drilling to total depth without any further losses. In addition, cases are presented where the system is used as a spacer pumped ahead of cement, resulting in the circulation of cement in an area where this has not occurred before. Another example resulted in the improvement of bonding by the cement. Additional scenarios demonstrate that pumping this material on a single stage cementing job, could replace the normal two stage job.

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Wellbore Re-entries and Repairs: Practical Limits of Cementing New Casing Inside Existing Casing

Cited by 2 publications

References 10 publications

Successful Re-entry in a Challenging Drilling Environment: A Case Study

Successful Re-entry in a Challenging Drilling Environment: A Case Study

Case Histories: Overcoming Lost Circulation During Drilling and Primary Cementing Operations Using an Environmentally Preferred System

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