GeoPressure Consulting Services

informationat the right time.GPC GeoPressure Consulting ServicesQuantitative analysisWeatherford’s GPC services useconventional quantitative techniquesto analyze geopressures prior to andduring drilling. Our GPC softwaregathers drilling exponent corrected,resistivity, sonic/interval velocity,density and shale density data. Weapply industry-recognized methodsto analyze and model the data priorto drilling. Similarly, our consultantsderive look-ahead pore and fracturepressure curves during drilling bymodifying the predrill model.Qualitative techniquesWorking solely with quantitative data does not provide a complete picture of the pore-pressureregime. Qualitative data such as gas-mud weight-rate of penetration (ROP) relationship,produced gases, gas scenarios, temperature, cavings, lithology, geopressure profiles, torque,drag and fill are necessary to constrain normal compaction trend line drawings. By applyingproprietary, software-enabled measurement criteria to some of these qualitative data andrelationships, the GPC group has developed semi-quantitative techniques that make iteasier to cross-check the output from the qualitative side of pore pressure analysis.Weatherford’s methodology leverages the cumulative knowledge and expertise of ourconsultants’ years of experience to make our predictions accurate and replicable.Additionally, most quantitative techniques are limited to normal faults and extensionalregimes which are likely to underestimate pore pressure in many of the world’s mostpromising basins. Weatherford’s GPC service integrates qualitative techniques to extendthe benefits of geopressure prediction and determination to these basins.Drilling efficiency and safety are continuously improved through continuous GPC pore pressure management, which integratespredrill, while-drilling and after-drilling knowledge and understanding of geopressure situations from one well to the next.AdjustAdvanceUsing downhole and real-time data, GPCconsultants continually refine the pressureprofile to reduce uncertainty and enabledrillers to better control mud weights, definecasing points and improve overall drillingefficiency and safety. The goal is to reduceuncertainty, not only at the current depth,but also ahead of the bit.Continually predicting, evaluating and adjusting the pore pressureprofile to successfully manage pore pressure—throughout the wellconstruction process and from well to well—enables wells to bedrilled more safely and efficiently, boreholes to be placed moreaccurately, and reservoir contents to be evaluated and managedfor maximum oil and gas recovery.The benefits continue after drilling. Understanding pressures inthe reservoir ultimately impacts production and payout. Reservoirengineers use pore pressure measurements gathered by GPCconsultants to identify and type fluids, define fluid contacts andassess reservoir continuity.© 2010 Weatherford. All rights reserved. 5

Real ResultsWeatherford’s GPC services have proven effective in more than 100 wells throughout the world.GPC clients are repeat clients, because they realize the benefits that accrue from dramaticallyimproved drilling efficiency and a significant reduction in safety and environmental risks.South Caspian: Slashing exploration time and costFor an offshore operationwith a history of kicks andstuck pipe and an averageNPT of one month perdrilling campaign, usingWeatherford’s GPChelped the operatorsave US$8 million andset the stage for furtherimprovements in wellconstruction efficiency infuture exploration wellsin the area.Repair Rig,54.75, 2%Stuck Pipe,658.75, 22%Situation before GPC deployedGPC: Before and AfterRepair Rig,54.75, 2%Stuck Pipe,658.75, 22%Situation after GPC deployedRepair Rig,79.5, 4%Fishing,32.5, 2%The GPC team helped to dramatically improve ROP and reduce costly NPT to a fraction of what ithad been on previous wells.Repair Rig,79.5, 4%Fishing,32.5, 2%Trinidad and Tobago: Zero NPT on four deepwater wildcat wellsConfronted with drilling Tobago’s first deepwater wells and with offset wells56 mi (90 km) away, an operator chose Weatherford’s GPC to providepredrill analysis and on-site determination and prediction leadingto considerable cost savings by eliminating NPT.6© 2010 Weatherford. All rights reserved.

GPC GeoPressure Consulting ServicesIndia: Saving a casing stringFor an operator in the remote jungles of northeastIndia, gathering complete and accurate pore pressuredata was essential to successfully drilling a wellwhere others had suffered a series of blowoutsand losses. The advice of the Weatherford GPCconsultant enabled the operator to modify the casingplan in time to eliminate a 13 3/8-in. casing stringsaving US$0.5 million.Weatherford’s GeoPressure Consulting services enableoperators to obtain a realistic overview of geopressuresituations in real time. With this information, informeddecisions can be made in time to avoid costly problemsthat can otherwise increase nonproductive drilling timeand compromise future production.Southeast Asia: Overcoming wellbore breathing complications in an HP/HT wellGPC consultants correctly identified and overcame wellbore breathing incidents in a high-pressure/high-temperature(HP/HT) well where previous kicks and ballooning had led to significant NPT. The GPC consultants prevented a kickin the pore pressure ramp and recommended a smaller bottomhole assembly (BHA), which enabled the operator tosuccessfully drill the HP/HT well with significantly reduced NPT.Pore pressure profile of the well showing produced gases atthe right with the higher produced gases indicating the zoneof severe ballooning.Close up of the ballooning zone. Equivalent circulationdensity and produced gases were dramatically reduced andballooning was mitigated when the BHA was changed perGPC team recommendation.© 2010 Weatherford. All rights reserved.7

GPC GeoPressure Consulting Servicesthe benefits of faster, safer, more productive drilling today by contacting us atgpc@weatherford.com, or by visiting weatherford.com.weatherford.com© 2010 Weatherford. All rights reserved. 6566.00Weatherford products and services are subject to the Company’s standard terms and conditions, available on request or at weatherford.com. For more information contact an authorized Weatherford representative. Unlessnoted otherwise, trademarks and service marks herein are the property of Weatherford. Specifications are subject to change without notice. Weatherford sells its products and services in accordance with the terms andconditions set forth in the applicable contract between Weatherford and the client.