API Connection Leak Equation Extended with Dependence on Axial Force and Backup Pressure

Goodman, M.A.; Mitchell, Robert F.; Kalil, Issa

doi:10.2118/194059-pa

Cited by 2 publications

(1 citation statement)

References 4 publications

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“…Temperature logging is based on the small temperature difference induced by fluid leakage. For high-pressure gas well, the tubing thread leakage is a common type, 40,41 but its leakage rate is so small that even high precision sensor cannot detect the temperature difference. Electromagnetic detection and multiarm caliper are usually combined together to measure the wall thickness of tubing or casing.…”

Section: Introductionmentioning

confidence: 99%

Measurement of wellbore leakage in high‐pressure gas well based on the multiple physical signals and history data: Method, technology, and application

Zhang,

Pan,

Cao

et al. 2023

Energy Science & Engineering

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Leakage is one of the most serious challenges for the safe production of high‐pressure gas wells for its high risks, including abnormal annular pressure, natural gas accumulation, and environment pollution, but available methods can hardly accurately measure the leakage type and depth, which are the key parameters for the rigless leakage repair and risk assessment. Therefore, this paper proposes a method to measure the leakage based on the characteristics, which combines qualitative and quantitative measurement together. Qualitative measurement considers the annular pressure, tubing pressure, liquid level, cement quality, and workover history. Quantitative measurement is determined by noise logging, electromagnetic logging, pressure logging, and temperature logging. The logging should be optimized according to the qualitative measurement. The method was successfully applied in high‐pressure gas well belonging to Tarim Oilfield. Two potential leakage types are provided based on the annular pressure, liquid level, cement quality, and workover history, including tubing leakage and linger hanger leakage. Based on the potential leakage types, the pressure difference, logging devices string, stopping length, and time are optimized to make the engineering logging reliable. Through measurement, two leakage points are found in tubing string. One is tubing body crack at the depth of 2724 m and the other is tubing thread leakage at the depth of 5211.7 m, which well matches the production data.

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Section: Introductionmentioning

confidence: 99%

Measurement of wellbore leakage in high‐pressure gas well based on the multiple physical signals and history data: Method, technology, and application

Zhang,

Pan,

Cao

et al. 2023

Energy Science & Engineering

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Triaxial Leak Criterion for Generic Premium Connection Under Combined Tension and Pressure Loads

Goodman¹

2022

IADC/SPE International Drilling Conference and Exhibition

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Recent papers introduced a triaxial leak criterion with hydrostatic dependence through the Mean Normal Stress P defined as the average of the three normal stresses. The new criterion with linear dependence on P required two leak constants. Example applications in these papers addressed American Petroleum Institute (API) connections. This paper applies the triaxial criterion to a generic premium connection and determines the leak constants from finite element analysis (FEA) for combined loads with tension. Instead of a linear dependence on P, the FEA results for the generic premium connection correlate better with a quadratic relationship in terms of (P - σn) where σn is the Lubinski neutral stress. The quantity (P - σn) is proportional to effective stress. Quadratic dependence means that three leak constants are needed for premium connections. A plot of the leak limit curve superimposed on the pipe-body yield envelope shows load combinations where leak occurs before the pipe yields. A key conclusion is that internal leak cannot occur without tension for the loads investigated. Indeed, with sufficient tension, both internal and external leak can occur at low pressures for this modified generic premium connection. Actual premium connections should be designed so this triaxial limit curve for leak is outside (or mostly outside) the pipe-body failure envelope.

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API Connection Leak Equation Extended with Dependence on Axial Force and Backup Pressure

Cited by 2 publications

References 4 publications

Measurement of wellbore leakage in high‐pressure gas well based on the multiple physical signals and history data: Method, technology, and application

Measurement of wellbore leakage in high‐pressure gas well based on the multiple physical signals and history data: Method, technology, and application

Triaxial Leak Criterion for Generic Premium Connection Under Combined Tension and Pressure Loads

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