Geomechanical consideration of drilling through heavily faulted formation

Mohd. Helmi Abd. Rahim, Khodaverdian Mohamad, Lik Jin Tang, Aaron Tan, Kumareson Paranthaman, Phyllis Seli, Arjan Brem, Alvin Chan, Paul Morphy

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

Abstract

Having a narrow drilling margin between pore pressure, borehole stability requirement and fracture pressure is a typical drilling challenge in deepwater setting. As demonstrated herein, drilling through weak faults, provides additional constraints to this already narrow drilling margin. Inability to adequately manage static and dynamic circulating mud weight may result in unwanted non-productive time, well control issues and loss of containment. During development drilling of a complex faulted domal structure in deepwater Northwest Borneo, highly deviated wells penetrated numerous seismic faults in the overburden and reservoir sections. It was observed that some of the dynamic loss events occurred at mud pressures much lower than the estimated formation fracture gradient, with approximately 70% of the loss events associated with drilling through leaky faults. In view of losses observation around the faults, the following mitigations were taken during the drilling campaign: pore pressure - fracture gradient (PPFG) plots were updated during the drilling campaign to include the reduction in fracture pressure limits associated with prognosed fault markers. The faulted intervals within the wellbore require reevaluation of well integrity strategy to ensure that the weaker fault zones could contain reservoir pressures throughout the field life, or otherwise opt to strengthen the weak zones via cement squeeze. Casing shoe placement depths were also optimized to avoid fault zones, particularly when the shoe integrity is critical as wellbore barrier. Presence of faults also necessitated changes to the drilling strategy and hole cleaning practice to minimize disturbance near the fault damage zone. Additionally, best practices such as securing early formation pressure while drilling before going into fault zone was actively adopted. These steps were crucial for successful drilling and cementing operation.

Original languageEnglish
Title of host publicationInternational Petroleum Technology Conference 2019, IPTC 2019
PublisherInternational Petroleum Technology Conference (IPTC)
ISBN (Electronic)9781613996195
Publication statusPublished - 1 Jan 2019
Externally publishedYes
EventInternational Petroleum Technology Conference 2019, IPTC 2019 - Beijing, China
Duration: 26 Mar 201928 Mar 2019

Publication series

NameInternational Petroleum Technology Conference 2019, IPTC 2019

Conference

ConferenceInternational Petroleum Technology Conference 2019, IPTC 2019
CountryChina
CityBeijing
Period26/3/1928/3/19

Fingerprint

Drilling
drilling
fault zone
Pore pressure
pore pressure
mud
borehole stability
containment
Boreholes
overburden
low pressure
Cleaning
Cements
cement
mitigation
well
disturbance
damage
loss

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Fuel Technology

Cite this

Abd. Rahim, M. H., Mohamad, K., Tang, L. J., Tan, A., Paranthaman, K., Seli, P., ... Morphy, P. (2019). Geomechanical consideration of drilling through heavily faulted formation. In International Petroleum Technology Conference 2019, IPTC 2019 (International Petroleum Technology Conference 2019, IPTC 2019). International Petroleum Technology Conference (IPTC).

Geomechanical consideration of drilling through heavily faulted formation. / Abd. Rahim, Mohd. Helmi; Mohamad, Khodaverdian; Tang, Lik Jin; Tan, Aaron; Paranthaman, Kumareson; Seli, Phyllis; Brem, Arjan; Chan, Alvin; Morphy, Paul.

International Petroleum Technology Conference 2019, IPTC 2019. International Petroleum Technology Conference (IPTC), 2019. (International Petroleum Technology Conference 2019, IPTC 2019).

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

Abd. Rahim, MH, Mohamad, K, Tang, LJ, Tan, A, Paranthaman, K, Seli, P, Brem, A, Chan, A & Morphy, P 2019, Geomechanical consideration of drilling through heavily faulted formation. in International Petroleum Technology Conference 2019, IPTC 2019. International Petroleum Technology Conference 2019, IPTC 2019, International Petroleum Technology Conference (IPTC), International Petroleum Technology Conference 2019, IPTC 2019, Beijing, China, 26/3/19.
Abd. Rahim MH, Mohamad K, Tang LJ, Tan A, Paranthaman K, Seli P et al. Geomechanical consideration of drilling through heavily faulted formation. In International Petroleum Technology Conference 2019, IPTC 2019. International Petroleum Technology Conference (IPTC). 2019. (International Petroleum Technology Conference 2019, IPTC 2019).
Abd. Rahim, Mohd. Helmi ; Mohamad, Khodaverdian ; Tang, Lik Jin ; Tan, Aaron ; Paranthaman, Kumareson ; Seli, Phyllis ; Brem, Arjan ; Chan, Alvin ; Morphy, Paul. / Geomechanical consideration of drilling through heavily faulted formation. International Petroleum Technology Conference 2019, IPTC 2019. International Petroleum Technology Conference (IPTC), 2019. (International Petroleum Technology Conference 2019, IPTC 2019).
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