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1st EAGE Workshop on GeoSteering and Well Placement
- Conference date: 07 Nov 2010 - 10 Nov 2010
- Location: Dubai, United Arab Emirates
- ISBN: 978-94-6282-056-2
- Published: 07 November 2010
21 - 31 of 31 results
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Geosteering with LWD Azimuthal Sonic Measurements
By A. AkiBroad frequency azimuthal sonic tools provide intriguing geosteering possibilities. They allow us to steer on porosity, lithology, hydrocarbons, or even stress variations.
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Implementation of a New Well Placement Technique in Deepwaters Channel-Levee Complexes: Case Study-Oyofield Nigeria
Authors I. Gagok and AKRAM KhedrIn Niger Delta tertiary sedimentary basin, maximizing production by optimizing well placement is one of the key significant challenges in channel-levee complexes of deepwater geological setting. This challenge becomes eminent where reservoirs are thin with lateral facies variations and highly laminated and intercalated sand and shale sequence as observed in Oyo field.
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Succesful Application of a Distance to Boundary Technology under Tough Drilling and Reservoir Conditions
Authors D.C. Salim, A.B.F. Guedes, C.S. Silva and R.B. SamarooThis paper demonstrates a successfull case study performed in Brazil, making use of geo-steering techniques. The uncertainties for drilling this well were very high due to the long distance from the pilot well and also due to vast amount of detected faults throughout the respective seismic section. Initial proposed model was based on client reservoir team interpretations of top/base surfaces (Seismic). As planned, the horizontal section starts but logs identified shale and continued with this lithology for over 180 meters. Client decided to change the status of the well to that of an appraisal and to begin building inclination in an effort to ascertain the top and base of the upper sand body that was observed on the pilot well logs. The new appraisal well mapped the base and top of this sand reservoir, in so, gathering the relevant data to aid in the development of a new geo-steering model. After finishing the appraisal well, the inconsistencies in the initial model were identified and it was related to seismic responses at a faulty region on the landing point. Distance to boundary service was used for keeping the trajectory inside the desired reservoir maping reservoir top/base aproach.
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Horizontal Well Placement and Segmentation for Completion at M1 Sandstone, Oriente Basin, Ecuador
Authors E. Rojas, G. Cuadros, R. Villalva, R. Chang, N. Orellana and R. PenarandaGeosteering application in a challenging geological scenario, where a 1000 ft horizontal section was placed into water driven reservoir, completing the well with inflow control device technology in segmented intervals determined based on petrophysical interpretation and facies characterization from logging while drilling measurements.
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Utilizing Collaborative Environments and 4-D Earth Models to Enhance Real-Time LWD-Based Reservoir Navigation
More LessBecause these local earth models are built from logging data obtained while drilling, they are an extremely accurate tool for making time-critical reservoir navigation decisions. For this reason the local, real-time models convey a better quality of information than the field model alone and represent a true advantage when it comes to placing a high angle well in challenging reservoir conditions. The fact these local models are built on command from the input of a reservoir navigation engineer without the need for additional interpretive workflows make them easy to update and share. Using a WITSML standard, this data can be shared across networks—permitting any personnel equipped with the viewer technology to observe and collaborate in real-time.
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Innovative Use of Real Time Density Image in Well Placement
Authors O. BABAYEJU, E. Brentjens, L. Clegg, M. Idris, S. Oloniboko, D. Nwabor, I. Jumbo and G. SantosoOptimizing reservoir contact whilst drilling a single developmental well within two targets separated by an impervious shale layer, presented a sea of geological and drilling challenges. Drilling a long reach lateral drain section in a velocity uncertain; structurally complex and probably faulted reservoir with poor control towards the toe was expected to be challenging. This paper will highlight how effective interpretation of RT ADN image with high confidence structural modification by Real Time Geosteering Screen (RTGS) aided the highly successful geosteering of Well-A horizontal well. This includes the planning of Well-B; the reduction of structural uncertainties and the successful drilling of Well-B with increased length of the drain section and increased N/G. With the use of conventional Well Placement with ADN density real -time image from InterACT, the lateral section was optimized in the two lobed targets. With the integration of structural information derived from the real-time ADN image data for Well-A, Well-B horizontal well was planned to near perfection. While drilling Well-B, there was little or no need for geosteering, as the well had no reason to deviate from the plan, hence the close match between actual and planned trajectories.
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Simplifying Geosteering Interpretation and Decision-Making in Complex Environments Using Deep Resistivity Images
Authors W Szczawinski, D. Zurcher and E. NoamanDirectional drilling, particularly in conjunction with geosteering, is used to land wells at preplanned points in a reservoir. The objective is to optimize wellbore placement of production sections with respect to reservoir boundaries, fluid contacts, and reservoir quality, by adjusting well trajectories in real time. Geosteering is accomplished and facilitated by the recognition of approaching conductivity contrast boundaries not yet penetrated by the wellbore by the use of deep reading tools and geologic models used to predict the boundaries approach.
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The Value of Integrated Pre-job Modeling and Planning in the Change to Horizontal Drilling and Completion Strategies
By Ossama Onsyis not common practice as a common place drilling strategy nowadays. As the knowledge of horizontal drilling it is not just a matter of drilling, we and the client decided to approach the project as an integrated project in order to be successful for the service company and our client. We found out that it is not enough to steer and place the horizontal well in the reservoir sweet spot. It is recommended to do an integrated pre-job model and full study, starting by the well trajectory stage to completion stage in order not only to drill and geosteer successful the horizontal well but to guarantee the optimum well Production over the life of the well. The study prior to drilling a horizontal well may include many steps depending on the needs from client and drilling knowledge.
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Optimized Wellbore Positioning Delivers Section 100% in the Pay Zone and Reduces Operational Time by 12 Days
Authors P. Johnson and F. HvedingThe InSite ADR sensor together with the StrataSteer 3D service provided a fully compensated, multiple-depth resistivity measurement, real-time petrophysical evaluation and stratigraphic navigation solution in one package. A suite of LWD sensors run in conjunction with this service package enabled 24-hour real-time modelling by geosteering specialists who constantly evaluated and correlated all the information acquired to maintain the well on the right path and to help ensure the pre-established target was delivered. Having the ability to detect approaching bed boundaries 18 feet from the tool, the InSite ADR sensor enabled the operator make adjustments in real time to stay in the target zone and allowed for increased drilling speed. Geological uncertainties were reduced and drilling operations were optimized, delivering an improvement net pay. Sperry delivered the 1,934 meter (6,345 feet) section in only three days, 12 days ahead of schedule, with an average rate of penetration of 34.32 meters per hour. The total amount saved on this section alone was in the range of several hundred thousand USD. But the real value comes into play when you repeatedly drill wells ahead of schedule allowing more wells drilled per yearly budget, and get more wells on production earlier than estimated.
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Structural Complexity Mapped at Well Scale
Authors M. H. Garcia and L.C. Terco DiasThis paper aims to describe the work on a well in the Campos Basin, Brazil, where using tools like azimuthal deep resistivity and resistive image was possible to identify structural features at time to correct the model, maximizing the range of geological reservoir crossed by the horizontal well.
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Deep Resistivity Images as a Factor in Making Geosteering Decisions
Authors W Szczawinski, S. Noaman and D. ZurcherElectrical images produced by azimuthal deep resistivity tools are usually discarded as a source of valuable information due to their lack of recognizable and qualifiable features giving geological information. This paper presents ways to use them in order to support decision making process.
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