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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
31 results
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Keynote Address: Geosteering: Where are we? Where are we Going?
By S. WilliamsGeosteering: Where are we? Where are we going? A play on words perhaps? Does this address focus on the present and future of geosteering or our location and direction in the reservoir?
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Geosteering - The Key to Late Life Appraisal on a Giant Producing Field
Authors Jason Scott and F. SalamovThe application of live geosteering on DWG resulted in the collection of a suite of data previously unobtainable with conventional high-angle wells. The data collected (i) bed parallel core, (ii) laterally extensive (>1000m) pressure measurements in a 42m TST bed and (iii) high resolution dip meter and azimuthal density data has allowed a step change in understanding and a fundamental re-working of the depletion plan for the structurally complex north flank of DWG. The data also confirmed that a simple model treating the whole of the north flank as a single structural zone is inappropriate given the different results in wells in a similar structural position but 4km apart. Although over 100 wells had been drilled on the structure prior to these geosteered wells, the data confirms that significant Km wide portions of the field can contain very high uncertainty even while a field is developed and on plateau. Geosteering bed parallel wells proved to be a very effective approach to reducing the remaining uncertainty on the field.
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When Production Strategy based on Latest Well Placement Solutions Successfully Lead to the Re-development of a Previously Abandoned Oil Field on the Norwegian Continental Shelf
Authors J-M. Denichou, E. Stueland, C. Dupuis and N. StevensonThe Yme Field is the first abandoned oil field to be re-developed on the Norwegian Continental Shelf. Production from the field was originally shutdown in 2001 due to a high water cut and unfavourable economics. Re-development, by a new operator, started in 2009 utilizing a strategy of high angle geosteered wells optimally placed to avoid water zones and maximize producible intervals.The wells of Yme were successfully geosteered, using DTB to detect the reservoir and map the water zones within the reservoir sands. We showed and discussed one of the instances of water zones that were encountered during the drilling campaign. After placing the wells, the enhanced knowledge of the subsurface geometry and the fluid distribution are necessary in order to ensure economical production on a complex field.
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Geophysical Support to a Challenging Horizontal Drilling- A Case History from SE Kuwait
Authors Aisha Al-Ghareeb, R. Kotecha, A. Omran, P. Mukherjee, M. Anandan and M. HafezOne of the world’s largest on-land oil field Greater Burgan, has been producing oil for over six decades from a massive sandstone reservoir, named ‘Burgan’. Due to such intensive drilling activities, specially horizontal wells, well placement is becoming challenging day by day. Moreover, water encroachment is another issue, which is also putting serious restriction to finding suitable location. Geophysical support is an indispensible part in every horizontal well planning. During planning, every well trajectory is generally safe-guarded from faults except very subtle one and accurately depth-predicted. However in one recently drilled well, a plan has been made to deliberately drill through a major fault, a few hundred feet above the target reservoir, to align horizontally into the reservoir at its crestal part and this has been a major unprecedented success in recent times. The main challenges were, drilling through fault and limited drain hole length of about 1000 ft available between two parallel fault system. Normally, faults are avoided in drilling. However, risk was taken to negotiate the fault of more than 110 ft throw to strike the reservoir top at the other elevated side of the fault block.
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Resistivity Images, NMR & PLT Logs Analysis of the Campanian Reservoirs of the Santos Basin
By L. MasuttiOne of the biggest challenges of horizontal well drilling has always been the technology barrier involved. Today, horizontal well drilling, is a common practice that have already overcome most of the technological and operational challenges. The challenges are those related to better reservoir characterization and the use of tools that achieve higher resolution in order to reduce the geologic risk during drilling.
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Optimized Sidetrack Placement Through the use of a Bed Boundary Mapping Tool
Authors M.S. Spotkaeff, R. Hill and M. CroftThe first use of a logging-while-drilling (LWD) bed-boundary mapping (BBM) tool in Australia has demonstrated the ability of the device to locate formation boundaries along significant lengths of the wellbores, reducing the uncertainty that would have been present if only a conventional suite of tools had been used. In the first well of the program, the thickness of the target reservoir was significantly less than expected, resulting in the borehole exiting the base of the sand shortly after exiting the casing shoe. Data from the BBM tool guided the design of a sidetrack well off the initial failed design resulting in a successful well with an initial production of over 16,000 barrels of oil per day (BOPD).
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Transition Zone Geosteering
Authors K.R. Jensen, A. E. Berle and A.K. ThorsenWith many major oilfields moving into decline, the importance of placing wells correctly relative to fluid contacts is becoming increasingly important. This paper discusses some aspects and highlights specific challenges of geosteering horizontal wells within or close to the oil-water transition zone using deep-reading resistivity measurements while drilling. Possible solutions are illustrated by examples from the Norwegian offshore oil fields Troll and Grane, showing the feasibility of geosteering along the OWC in long horizontal sections using advanced resistivity suites. Fit-for purpose solutions include extra deep reading resistivity and azimuthal resistivity while drilling, combined with predicitve resistivity response modelling.
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Geosteering in Thin Carbonate Clinoform Reservoirs - A Low Tech and High Tech Case Study
Authors H. Saadi, A. Cruesen, W. Kholeif, M. Singh, L. Grant-Woodley, H. Hadhrami, S. Shahaibi, N. Sirlan, D.A. Teixera, F. Silva, M. Yarabi, I. Mahruqi, R.P. Cook and H. SoekThis paper discusses the use of geosteering technology for well placement and its role in the appraisal of a stratigraphic carbonate play in North Oman. It illustrates the objectives and risks of the appraisal drilling in thin and heterogeneous carbonate reservoirs. Three case studies are presented to illustrate the optimal use of geosteering tools that are currently available, balancing costs with optimal well delivery.
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Optimizing a Two Compartment Rerservoir in Deep Water Turbidite Sand by Single Well Placement
Authors Gagok Santoso, O. Babayeju, D. Nwabor, C. Oduah, V. Bandele and E. PennaThe drilling of a single development well with two targets separated by a fault in deep water offshore was not expected to be easy. This is the reason of TOTAL Upstream Nigeria Limited willing to engage the services of Schlumberger’s new Logging While Drilling Technologies to enhance the Well Placement process in Well-A and drain the reservoir in a cost effective manner. The decision to go beyond conventional well placement was borne out of the fact that proactive well placement decisions would be a key to minimum reservoir exits. To achieve this, a technology driven approach of detecting the formation changes early during drilling was needed. These changes, when addressed, can be translated into maximizing reservoir contact, limiting well-bore tortuosity thus enhancing optimal production.
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Keynote Address: Geosteering to Consistency - Building Well Placement Teams to Deliver High-Rate Gas Developments Offshore Trinidad
More LessSuccessful geosteering occurs when incoming reservoir data is interpreted in real-time, in order to model stratigraphy ahead of the bit and guide steering decisions, in an iterative process that keeps the wellbore optimally positioned to achieve long term reservoir management objectives. This process of Proactive Geosteering ― putting the reservoir drainhole in the right place ― creates significant value. In addition to functioning cutting edge technology ― tools, communications, modelling applications ― it requires remotely located individuals to collaborate closely in multidisciplinary Well Placement Teams. To consistently deliver top quartile successfully geosteered wells, attention should be paid to adequately resourcing well placement and supporting technical teams and to minimizing personnel turnover during multi-well projects. This paper reviews the journey to fully functioning integrated well placement for an asset team working in Trinidad. Case studies are used to share key lessons learned from three multi-well drilling campaigns over an eight year period.
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Evaluation of an Independent Solution for Geosteering and Horizontal Well Placement – A Case Study for Dubai Ilam Reservoir
More LessA combination of higher oil prices and need to replace reserves to offset natural decline from major fields means that the industry is targeting difficult to reach, heterogeneous and thinner reservoirs making well placement a key factor to optimize the reservoir inflow and access these reserves. Geosteering technology has been the subject of discussion for many years since horizontal well technology became available, but it was and is mainly managed by the services companies and limited to the assigned service company's Geosteering expert, the directional driller, and the well site geologist. In the current economic climate, Dubai Petroleum Establishment (DPE) made a decision to demonstrate the applicability of an in-house Geosteering workflow, which excludes expensive service company personnel and involves the integration of the Asset Team with the Operations Group running the software to improve well performance ensuring that the Drillers have all the information at hand to do proactive changes to the planned well trajectory based on real-time information. The approach adopted in DPE was to use a lower cost independent Geosteering solution, a technique very similar of what the services companies do, with a workflow that, if properly applied proves successful in placing wells and reducing costs.
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Well Productivity Estimation during Drilling
By Y. JalaliWe introduce a method to estimate well productivity during drilling, if prior processing of petrophysics, bed boundary, and mobility profile is done during drilling. We specifically address uncertainty.
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Keynote Address: Unconventional Geosteering for Unconventional Reservoirs
By J. PitcherGeosteering in conventional reservoirs has typically relied on discrete, petrophysical measurements being made in real time that are compared to an offset or type log. An interpretation of the geology is made and is constantly updated, and the well steered according to a predefined set of requirements, essentially defining the sweet spot (Pitcher et al. 2010). While these techniques often have value in unconventional reservoirs, geologists regularly find these tools wanting. In unconventional resources, the best rock for production may not be defined by petrophysical parameters but by rock properties, which preclude the use of direct petrophysical comparative techniques (Market et al. 2010).
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Geosteering with Minimal LWD Capability: Biosteering during Underbalanced, Coiled Tubing Drilling Operations for Gas in the Middle East and the Development of the Stratsteer Concept
More LessIn this presentation, a brief introduction to the concept and practise of biosteering is followed by insights into major developments in scope that followed first involvement in underbalanced, coiled tubing drilling for gas production in the Middle East. Success as the geosteering technique of choice for this type of operation has led to continued expansion of scope, to StratsteerTM, the more inclusive service that covers a wide range of geoscience criteria related to strata.
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Innovative Well Placement Solutions for Optimized Shale Gas Development
Authors J.M. Denichou, S.Y. Hen, J. Kok, R. Malpani, E. Tollefsen and J. BaileyUnconventional shale gas reservoirs are known for its low porosity, low matrix permeability, the lack of an obvious seal or trap, large regional extend and in most areas, are believed to be highly heterogeneous in nature. As a result, it is common practice to evaluate reservoir characteristics and determine horizontal shale gas targets from a vertical pilot well. Horizontal production wells are then drilled and symmetrically frac stimulated to improve permeability around the borehole and maximize reservoir exposure.
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Keynote Address: Key Performance Indicators for Geosteering
More LessWe propose in this paper is to develop a wider common understanding of an industry standard to evaluating the value of geosteering. By having common measures of how well a geosteered well is on the field management compared to a geometric well we will ensure that the geosteering of wells are in favour of any other well placement procedures. Points to evaluate are: Maturity of field. Length of horizontal section. Geological heterogeneity. Fluid complexity.
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PeriScope Tool as the Drive to Improve the Geosteering Performance on Odoptu-More Field, Sakhalin
Authors A. Shirshov and Olga S. FedorovaDeveloping Odoptu-Morye field is inseparably linked to Schlumberger gradually implementing new technologies. Geosteering has been a critical technology for the field development. Odoptu-Morye field is structurally and lithologically a very complicated due to the large number major and sub-seismic faults, high dipping, deposits irregularly, presence of calcite concretions and inconsistent true thickness which not retain laterally. Schlumberger started drilling and measurement on the Odoptu-Morye field in 2003. In 2005 arcVISION, adnVISION and sonicVISION were introduced. During that period pay zone length was up to 100m and all of the wells exited the target zone. In 2007 Schlumberger introduced a well-placement service using ADN density image interpretation. Using this pay zone length was increased to 500m, however exiting the reservoir occurred on every well. Net to gross ratio increased to 67-95%. In 2008 the PeriScope tool was introduced. PeriScope’s directional, deep imaging while drilling was suited to this application because of the high conductivity contrast between the oil bearing reservoir and the roof and base shale. Using the PeriScope tool considerably improved the structural control on the Odoptu-More field and so improves the geosteering performance and achieves a net to gross ratio 100%.
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Geological Risk Analysis for Horizontal Wells based on Drilling Campaign in the Cretaceous Burgan Formation, Kuwait
Authors Omran Al Zankawi, J. Bardalaye, H. Al-Enezi, K.H. Al-Azmi, F. Al-Matrood, R. Kotecha, J. Ahsan, A. Safar and J.H. Al-HumoudThe Cretaceous Burgan Formation of the Greater Burgan Field, Kuwait (Fig. 1) is the largest clastic reservoir in the world. To increase production from these clastic reservoirs, a number of horizontal wells have been drilled during the last four years. The targeted reservoir sands show a lot of heterogeneity. Predicting sand continuity in such a scenario is a challenge. Moreover, velocity anomalies in the shallow sections and structural complexity in some areas brings in a great deal of uncertainty in the depth prediction. Due to these reasons, landing the well in the desired reservoir section and drilling the drain hole with maximum pay zone exposure becomes very difficult. To mitigate these risks, a methodology has been developed to analyze the geological risks involved before drilling a horizontal well.
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Planning and Drilling Horizontal Wells in a Deep Water Environment, Campos Basin, Brazil
Authors R. Beer, A.A.G. Meira, G.H. Schmitt, M.L. Moraes and R.O. CarvalhoDeep water environment is a challenging one to operate and most of the production projects rely on horizontal wells to be economically feasible. Optimizing the well placement of these horizontals demands an integrated approach including many different professionals and ultimate geosteering tools. Nowadays we observed a increment in the usage of images, both resistivity and nuclear, that provided reliable data to identify bed boundaries allowing reactive actions in geosteering. New generation deep resistivity devices indeed enlarge the drilling capabilities enabling a proactive geosteering, that means detect and identify bed boundaries before the bit crosses them. These new technologies require a sophisticated monitoring environment which is accomplished in the Decision Support Center. In this center all real time data are analyzed by the project team, to achieve the final goal of optimizing the wellbore trajectory in order to maximize the reservoir exposure and minimize the mechanical hazards like severe doglegs or others to ensure the best completion and productivity of the horizontal well. In this paper we present a typical workflow in designing and executing a horizontal well, This workflow will be illustrated through several field examples applying the most recent technologies currently available.
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Brown Field Well Placement Optimisation using NMR
By S WilliamsThis is a case study describing how the well placement challenges in a brown field environment were successfully overcome by using NMR while drilling.
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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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