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• W2034766679 abstract "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. The challenges of this type of operation are many. One of these is to avoid excessive surge pressures while running the new casing and means that on many occasions running rates of the casing may have to be approximately 1 foot per second. Excessive surge pressure can fracture a formation of interest, making it difficult to obtain the desired production rates. Another challenge is to match casing size for stimulation with achieving successful cement isolation of an annular space. Smaller diameter casing will result in increased friction pressure and therefore treatment rate restrictions. Stimulation may require multistage completions to be effective. The increased cost of stimulation must be balanced with the need to achieve cement isolation. Presented are the analyses of various scenarios examining fracture gradient, old casing burst pressures, fracture stimulation rates and pressures and equivalent circulating densities of potential cement slurries. Case histories are used to illustrate these scenarios and present situations in which the cost of the cement pumped versus what should have been required is compared. Also presented, are the operational and cost differences regarding stimulation as a function of casing internal diameter. In one case over three times the quantity cement, which should have been necessary to achieve circulation back to surface, was pumped without circulating. Background Several situations exist where a smaller OD casing is cemented inside an existing casing. These cases are re-entry into a previously abandoned wellbore, repair of an existing casing or to facilitate drilling deeper. The cases of re-entry and repair are of primary concern since typically these involve a smaller annular space between the two strings of casing. The concerns are twofold, first getting a good cement job and second having sufficient internal diameter (ID) to facilitate future stimulation treatments." @default.
• W2034766679 created "2016-06-24" @default.
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• W2034766679 date "2009-10-04" @default.
• W2034766679 modified "2023-09-26" @default.
• W2034766679 title "Wellbore Re entries and Repairs: Practical Limits of Cementing New Casing Inside Existing Casing" @default.
• W2034766679 doi "https://doi.org/10.2118/124381-ms" @default.
• W2034766679 hasPublicationYear "2009" @default.
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