Surge Pressures in Low-Clearance Liners

Mitchell, Robert J.

doi:10.2523/87181-ms

Proceedings of IADC/SPE Drilling Conference 2004

DOI: 10.2523/87181-ms

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Surge Pressures in Low-Clearance Liners

Robert J. Mitchell¹

Abstract: fax 01-972-952-9435. AbstractPressure surges have long been known to cause well-control problems. As early as 1934, pressure surges resulting from pipe swabbing were identified as a possible cause of fluid influx, and in extreme cases, blowouts, and lost-circulation problems. This paper fully describes the technical details for calculating dynamic surge pressures with high viscous forces in the low clearance liner annulus. Several sample problems of realistic low clearance liner runs are used to show the unusu… Show more

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Cited by 4 publications

References 11 publications

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

Stilwell

Metcalf²,

Purvis³

2009

All Days

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

Stilwell

Metcalf²,

Purvis³

2009

All Days

View full text Add to dashboard Cite

show abstract

Automation of Drawworks and Topdrive Management to Minimize Swab/Surge and Poor-Downhole-Condition Effects

2010

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Unwary axial and rotational movement of the drill-string can cause formation fracturing or fluid influx resulting in costly remedial actions. With increasingly complex wellbore geometries and narrow geo-pressure windows, it is not always obvious for the Driller to estimate the real manoeuvring limits of the drawworks and the topdrive, especially under poor downhole conditions. The solution presented in this paper uses continuously updated safe guards applied to the drilling control system to maintain a downhole pressure within the acceptable limits of the open hole formations. It also stops automatically the movement of the drill-string in case of abnormal hook loads or surface torques. Since automatic actions can be triggered in case of an unexpected situation, some standard procedures have been fully automated, including friction tests and backreaming.Numerical models are used to constantly calculate the maximum accelerations and velocities which can be applied to the drill-string in the current drilling conditions. The resulting envelope of protection is depending on many factors. Therefore, a proper evaluation of the downhole conditions is of paramount importance for the quality of the calculated safe guards. An automatic calibration of the physical models, based on surface measurements, is at the heart of the system. The calibrated mechanical models are used to determine the limits for abnormal surface torques or hook loads. It is therefore possible to automatically take actions in case of overpull, set-down weight or high torque.In 2008, a preliminary version of the system has been tested during the drilling of a well in the North Sea. Even though the control algorithms did work well at that time, it has been noticed that in some circumstances the drilling control system would not be ready in time for fast changing drilling conditions. An improved version of the drawworks and topdrive automation system has been tested during the drilling of three North Sea wells in the spring of 2009. In this last version, the response time of the system has been optimal at all time. The Drillers involved in the testing of the system have found the system useful and user-friendly.

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Design of “Anti Surge” Methodology to Mitigate Severe Lost Circulation While Running Non Conventional Casing / Liner Sizes to Isolate Salt and Clay Domes in Deep Wells in Mexico South

Orellan¹,

May²,

Bedino³

et al. 2010

All Days

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A typical well scheme for a deep well usually has five casing sections that can include a liner string. However the number of casing strings is given by the number of intermediate sections required to isolate unstable formations prior to reach the pay zone. The industry has defined the casing sizes following a standard well design of five casing string (Table 2) that can include liners depending on the well requirements. The clearance between casing string is based on a standard drift which is related to unobstructed tolerance through pipes that is associate to the casing geometry such us ovality and casing straightness, this design criteria does not take in account other phenomenons that can compromise the effectiveness of a well design such us the effect of surges forces while running casing strings. In prescence of competent formations and shallow wells, the design citeria explained above does not represent risk in term of loss circulation during running casing or cementing operations. However in the Mezosoic fields at Souht of Mexico (Figure 1), the geological structures are domain by unstables clay domes and eventually salt domes (Figure 2) that are located between 3,200 m - 3,700m. Also the drilling environment is characterized by narrow mud windown. As a consequence the wells are completed with six casing string. The wells drilled in this fields are classified as high risk wells due to the potential hole problems related that include massive lost circulation. The geometry of the wells is also an issue since the use of non conventional casing sizes to isolate unstable formations left low clearance between casing strings that induce lost circulation when running casing. This paper describes the actions taken to reduce massive loss circulation and define an “Anti surge methodology to mitigate severe loss circulation” when running non-conventional casing sizes with reduced clearance between casing strings in some fields located at South of Mexico.

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Surge Pressures in Low-Clearance Liners

Cited by 4 publications

References 11 publications

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

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

Automation of Drawworks and Topdrive Management to Minimize Swab/Surge and Poor-Downhole-Condition Effects

Design of “Anti Surge” Methodology to Mitigate Severe Lost Circulation While Running Non Conventional Casing / Liner Sizes to Isolate Salt and Clay Domes in Deep Wells in Mexico South

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