A new method to evaluate leak-off tests in Shallow Marine Sediments (SMS)

Amir Paknejad, Jerome Schubert, Mahmood Amani

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

Leak-off Tests (LOT) and Pressure Integrity Tests (PIT), are verification methods to evaluate cement jobs and estimate the fonnation fracture pressure at the casing shoe. Although analysis of LOT in deep wells is considered a well known and practical procedure, the interpretation of LOT in Shallow Marine Sediments (SMS) is less clear. LOT in SMS gives a non-linear relationship between the pumped volume and the observed pump pressure and there is no obvious point of deflection or "leak off" from the initial linear section of the plot. Because of non-linearity of LOT plots in SMS, LOT could be inconclusive and difficult to interpret. Incorrect interpretation of LOT would lead to costly problems that might jeopardize well progress such as; unnecessary squeeze jobs, premature setting of casing, and lost circulation problems. This paper presents a new method to analyze casing shoe leakoff pressure in the SMS. A mathematical model is derived to assist in analyzing non-linear LOT behavior and the new method is supported by field data from LOT in SMS. LOT interpretation is the basis for the critical drilling decisions such as; casing setting depths, cement job evaluation, drilling fluid selections, and well control methods. Correct interpretation of the LOT can help to avoid variety of problems and save considerable amount of time and money.

Original languageEnglish
Title of host publicationSociety of Petroleum Engineers - SPE Saudi Arabia Section Technical Symposium 2007
PublisherSociety of Petroleum Engineers
ISBN (Print)9781555639600
Publication statusPublished - 1 Jan 2007
EventSPE Saudi Arabia Section Technical Symposium 2007 - Dhahran, Saudi Arabia
Duration: 7 May 20078 May 2007

Other

OtherSPE Saudi Arabia Section Technical Symposium 2007
CountrySaudi Arabia
CityDhahran
Period7/5/078/5/07

Fingerprint

marine sediment
Sediments
Cements
Drilling fluids
Drilling
test
method
Pumps
Mathematical models
cement
drilling fluid
deflection
nonlinearity
pump
drilling
well

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Energy Engineering and Power Technology
  • Fuel Technology

Cite this

Paknejad, A., Schubert, J., & Amani, M. (2007). A new method to evaluate leak-off tests in Shallow Marine Sediments (SMS). In Society of Petroleum Engineers - SPE Saudi Arabia Section Technical Symposium 2007 Society of Petroleum Engineers.

A new method to evaluate leak-off tests in Shallow Marine Sediments (SMS). / Paknejad, Amir; Schubert, Jerome; Amani, Mahmood.

Society of Petroleum Engineers - SPE Saudi Arabia Section Technical Symposium 2007. Society of Petroleum Engineers, 2007.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Paknejad, A, Schubert, J & Amani, M 2007, A new method to evaluate leak-off tests in Shallow Marine Sediments (SMS). in Society of Petroleum Engineers - SPE Saudi Arabia Section Technical Symposium 2007. Society of Petroleum Engineers, SPE Saudi Arabia Section Technical Symposium 2007, Dhahran, Saudi Arabia, 7/5/07.
Paknejad A, Schubert J, Amani M. A new method to evaluate leak-off tests in Shallow Marine Sediments (SMS). In Society of Petroleum Engineers - SPE Saudi Arabia Section Technical Symposium 2007. Society of Petroleum Engineers. 2007
Paknejad, Amir ; Schubert, Jerome ; Amani, Mahmood. / A new method to evaluate leak-off tests in Shallow Marine Sediments (SMS). Society of Petroleum Engineers - SPE Saudi Arabia Section Technical Symposium 2007. Society of Petroleum Engineers, 2007.
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