Lewis, Dennis Marathon Oil Co No Established Section-Rocky Mountain Region Rocky Mountain North America Lindahl, Carl Saudi Aramco Kingdom of Saudi Arabia Section Middle East and North Africa Li, Robert Shell Exploration & Production Co Gulf Coast Section Gulf Coast North America Liu, Chunlei Shell ...
Lee, Jonathan Ryder Scott Company, L.P. Gulf Coast Section Gulf Coast North America Lewis, Dennis Marathon Oil Co No Established Section-Rocky Mountain Region Rocky Mountain North America Lindahl, Carl Saudi Aramco Kingdom of Saudi Arabia Section Middle East and North Africa Li, Robert Shell Explora...
There are aspects of pipe behavior and limits that can be confusing and counter intuitive. These include understanding the conditions under which a pipe will "buckle" and when the stresses in the pipe will reach a point where the pipe material "yields". The combination of forces, pressures, torque and bending moments that are being applied to the pipe may make it difficult to understand how the pipe will responding. The objective of this paper is to clarify some of these issues and demonstrate a simplified calculation tool for field engineers to use when critical decisions need to be made quickly.
The existing API equation for internal leak predicts the internal pressure to overcome the pin-box contact pressure generated from the makeup interference plus the energizing effect of internal pressure which enhances the seal. For threaded connections, internal and external pressures close the connection and increase the leak resistance, whereas axial loads open the connection and decrease the leak resistance. These competing effects must be included to accurately assess the connection leak resistance under any combination of loads at any point in any string. Following the same approach used by API for internal leak, this paper obtains similar results for external leak. For API connections, the effects of combined axial force and backup pressure are then incorporated into the internal/external leak equations using results from the Mitchell and Goodman (2018) paper presented at the 2018 SPE-IADC Drilling Conference. Sensitivities of leak ratings to combined loads for API connections are presented for both tubing and casing sizes. An example design case shows the importance of considering combined loads.
Mitchell, Robert F. (Well Complete LLC) | Zwarich, Nola R. (ConocoPhillips) | Hunt, Hai L. (ConocoPhillips) | McSpadden, Albert R. (Altus Well Experts Inc.) | Trevisan, Ruggero (Altus Well Experts Inc.) | Goodman, Malcolm A. (Altus Well Experts Inc. Retired)
Recent development of a new dynamic model for tubular stress analysis is now extended to the design challenges and failure modes characteristic of long production casing strings in extended horizontal shale wells. In particular, the issue of cyclic loading due to repeated sequences of multi-stage fracturing has not been addressed until now. The new model provides the ideal means of analysis of cyclic thermal loads as well as critical impact of compression due to initial running friction.
The new dynamic model of tubular stress solves the one-dimensional momentum equation over a time step sequence initiated from the original running of the string into the wellbore. Friction is modeled in a fully history dependent manner, with damping provided naturally by the wellbore fluid viscosity. Local pipe velocity as well as magnitude and orientation of sliding friction is solved at each node with friction aggregated at the connection upset and joint mid-point.
Unconventional shale wells pose critical design challenges especially in regard to the long production casing strings run in extended horizontal or lateral sections. Compressive frictional loads accumulated during running are trapped in the string by cement, packers and the wellhead. Thus the initial load state must fully account for the initial frictional state in order to be realistic and conservative. Hydraulic fracturing at high flow rates and significant pump pressures, including the possibility of screen-out, represents a critical design load on the casing which can also significantly alter the orientation and magnitude of tubular/wellbore frictional contact. The particular phenomenon of repeated fracturing treatements in a multi-stage stimulation compounds the design challenge. Cycles of cold stimulation followed by renewed hot production can lead to unexpected migration of axial loads and localization of critical stresses.
The cyclic nature of loading due to repeated sequences of multi-stage re-fractures and renewed production has not received industry attention due to the unavailability of appropriate models. Lack of adequate models has perhaps resulted in the problem being overlooked. A dynamic model is ideally suited to the analysis of cyclic loads because of its inherent ability to account for a full history of friction loads. The dynamics of loading and unloading are also critical to this new ability to address the design problem. Previous static-based stress models have been unable to provide a comprehensive basis of design.
The IADC and SPE are committed to delivering a balanced agenda around Diversity and Inclusion, to support member companies as they strive to address the gap in the Oil & Gas Sector. In 2019 the SPE/IADC International Drilling Conference and Exhibition in The Hague will host a session that allows delegates to explore the challenges facing the industry and hear firsthand, how it can be addressed. This initiative aims to build on the efforts already being undertaken at individual company levels to attract, develop and retain female staff - especially in technical and senior management roles, and to remove barriers that may currently hinder or discourage women from rising through the ranks into leadership roles. The aim is to address the factors contributing to the gender gap and to advantage all companies, their owners and shareholders through the incremental performance and value that parity will generate. This is good for our people, good for our stakeholders, and good for our business. Whilst in 2017 the session focused on subjects arising from DAVOS 2016 namely Leadership, Aspiration, goal setting, STEM, recruitment and retention, corporate culture and work life balance, the panel now feel it is time to move the conversation forward with some hard-hitting topics that affect the lives of many. Make sure you join us for this special session in The Hague.
Sukanto, Sukanto PT Pertamina EP Sumatra Section South Asia and the Pacific Sultan, Fouad A Saudi Aramco SAOO Kingdom of Saudi Arabia Section Middle East Suseno, Agus PT Pandawa Prima Lestari Java Indonesia Section South Asia and the Pacific Suwailem, Abdulaziz Saudi Aramco PE&D Kingdom of Saudi Arabia Section Middle East Swain, Robert San Joaquin Valley Section Western North America Sweeney, Eugene Cudd Well Control Gulf Coast Section Gulf Coast North America Syahdina, Susan PT Pertamina EP Balikpapan Section South Asia and the Pacific Tammam, Mohammed BADR Petroleum Co. Egyptian Section Middle East Tariq, Bilal Saudi Aramco D&WO Kingdom of Saudi Arabia Section Middle East Tayeb, Yousef Saudi Aramco PE&D Kingdom of Saudi Arabia Section Middle East Teff,James Saudi Aramco Kingdom of Saudi Arabia Section Middle East Teo, Choon Ngan Akine Inc Calgary Section Canada Thabit, Khalid Saudi Aramco PE&D Kingdom of Saudi Arabia Section Middle East Thiam, Flora Yi Han Sabah Shell Petroleum Co. Sarawak Section Northern Asia Pacific Thomas, Tony Abu Dhabi Co For Onshore Petroleum Operations Ltd Abu Dhabi Section Middle East Tipton, Donald ALL Consulting LLC Mid-Continent Section Mid-Continent North America Tobing, James PT Pertamina EP Balikpapan Section South Asia and the Pacific Townsend, Stephen Well Cementing Quality Assurance Svcs LLC No Established Section-Eastern North America Region Eastern North America Trotter, Ed Resolute Energy Corp Denver Section Rocky Mountain North America Trust, Byron Petro-Chem Operating Co Inc Lou-Ark Section Mid-Continent North America Tubayyeb, Abdulaziz Saudi Aramco PE&D Kingdom of Saudi Arabia Section Middle East Turkistani, Abdulaziz Saudi Aramco SAOO Kingdom of Saudi Arabia Section Middle East Turnage, Keith Saudi Aramco Kingdom of Saudi Arabia Section Middle East Tuwaijri,Ibrahim Saudi Aramco PE&D Kingdom of Saudi Arabia Section Middle East Udonwa, Onome Shell Petroleum Dev Co Nigeria Port Harcourt Section Africa Unnikrishnan, Vikram Baker Hughes Saudi Arabia Kingdom of Saudi Arabia Section Middle East Uranta, Maxwell Calgary Section Canada Uvieghara, Tega Shell Nigeria E&P Co. Ltd.