fax 01-972-952-9435. AbstractWe illustrate the use of a new technology for navigating and characterizing various types of oil reservoirs. Real-time images from Azimuthal Propagation Resistivity measurements provide a "map" of the resistivity patterns up to several meters around the wellbore. In addition, recently developed processing and quantitative interpretation techniques help guide the placement of the well and provide a new perspective of the formation.When navigating in gas drive reservoirs, the azimuthal resistivity measurement is used to maintain the wellbore at a prescribed distance above the oil-water contact. With its exponential sensitivity to distance, the measurement is able to detect even small changes in the distance to the oil-water interface. In a few instances, the azimuthal information provided by the real-time deep resistivity images indicates probable coning due to offset well production.Similar principles are applied in high angle drilling of water drive reservoirs. The deep azimuthal information allows the drilling engineer to maintain the wellbore at a prescribed distance immediately below a shale roof. The deep resistivity image from the azimuthal resistivity measurement also makes it easy to distinguish the roof from the occasional approaching shale lens.Whereas shallower reading LWD image logs (e.g. Gamma Ray and Density) only indicate a geological feature proximal to wellbore, the deep reading azimuthal resistivity measurement can provide geologic structure information at the reservoir scale. Visual displays show the subsurface surrounding the wellbore; quantitative algorithms accurately compute the distance, direction, and apparent dip for reservoir related geological events. A new conductivity unit named "Transverse Siemens" is proposed to help quantify the new azimuthal propagation measurement.
TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractThe Foinaven, Loyal and Schiehallion fields lie West of Shetland, some 170 Km west of Sullom Voe. These fields, operated by BP, consist of a number of channelised sandstone reservoir sequences of Paleocene age. They have been developed by high angle/horizontal production and injector wells, the placement of which is critical to the effective drainage of the reservoirs. The reservoirs have significant compartmentalisation due to a number of faults and facies boundaries which means that formation pressure data, coupled with other surveillance information, are critical in ensuring correct well placement. Additionally, formation pressures are required by completion engineers to determine completion string geometry. Until recently, the only available method for acquiring these formation pressures was to run a wireline tester on drillpipe, after the well had been drilled. As all other FE logs were generally acquired using LWD this was time consuming and expensive on the new generation rigs required to drill in this area. In 2004, the first pressure testing LWD tools were deployed in these fields, allowing formation pressure data to be acquired as part of the drilling process, thus allowing real-time decisions relating to wellbore trajectory to be taken, and eliminating additional pipe conveyed wireline runs. This paper discusses the process which was used to validate the measurements, quality control of the real time and memory data, and examines some of the advantages and disadvantages of acquiring formation pressure measurement as the well is drilled rather than after reaching TD.
TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractThe Foinaven, Loyal and Schiehallion fields lie West of Shetland, some 170 Km west of Sullom Voe. These fields, operated by BP, consist of a number of channelised sandstone reservoir sequences of Paleocene age. They have been developed by high angle/horizontal production and injector wells, the placement of which is critical to the effective drainage of the reservoirs. The reservoirs have significant compartmentalisation due to a number of faults and facies boundaries which means that formation pressure data, coupled with other surveillance information, are critical in ensuring correct well placement. Additionally, formation pressures are required by completion engineers to determine completion string geometry. Until recently, the only available method for acquiring these formation pressures was to run a wireline tester on drillpipe, after the well had been drilled. As all other FE logs were generally acquired using LWD this was time consuming and expensive on the new generation rigs required to drill in this area. In 2004, the first pressure testing LWD tools were deployed in these fields, allowing formation pressure data to be acquired as part of the drilling process, thus allowing real-time decisions relating to wellbore trajectory to be taken, and eliminating additional pipe conveyed wireline runs. This paper discusses the process which was used to validate the measurements, quality control of the real time and memory data, and examines some of the advantages and disadvantages of acquiring formation pressure measurement as the well is drilled rather than after reaching TD.
fax 01-972-952-9435. AbstractWe illustrate the use of a new technology for navigating and characterizing various types of oil reservoirs. Real-time images from Azimuthal Propagation Resistivity measurements provide a "map" of the resistivity patterns up to several meters around the wellbore. In addition, recently developed processing and quantitative interpretation techniques help guide the placement of the well and provide a new perspective of the formation.When navigating in gas drive reservoirs, the azimuthal resistivity measurement is used to maintain the wellbore at a prescribed distance above the oil-water contact. With its exponential sensitivity to distance, the measurement is able to detect even small changes in the distance to the oil-water interface. In a few instances, the azimuthal information provided by the real-time deep resistivity images indicates probable coning due to offset well production.Similar principles are applied in high angle drilling of water drive reservoirs. The deep azimuthal information allows the drilling engineer to maintain the wellbore at a prescribed distance immediately below a shale roof. The deep resistivity image from the azimuthal resistivity measurement also makes it easy to distinguish the roof from the occasional approaching shale lens.Whereas shallower reading LWD image logs (e.g. Gamma Ray and Density) only indicate a geological feature proximal to wellbore, the deep reading azimuthal resistivity measurement can provide geologic structure information at the reservoir scale. Visual displays show the subsurface surrounding the wellbore; quantitative algorithms accurately compute the distance, direction, and apparent dip for reservoir related geological events. A new conductivity unit named "Transverse Siemens" is proposed to help quantify the new azimuthal propagation measurement.
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