Dip Interpretation from Resistivity at Bit Images (RAB) Provides a New and Efficient Method for Evaluating Structurally Complex Areas in the Cook Inlet, Alaska

Ford, Gary E.; Hartner, John; Grether, Bill; Waters, Doug; Cryer, Jesse V.

doi:10.2118/54611-ms

Cited by 5 publications

(1 citation statement)

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“…LWD resistivity image [6][7][8][9][10] and the new extra deep directional resistivity [11][12][13] are more robust measurements (less sensitive to hole conditions) and have been used to improve the placement of ML wells in thinly bedded reservoirs.…”

Section: Advanced Lwd Geosteering Technologiesmentioning

confidence: 99%

Geo-Steering with Advanced LWD Technologies - Placement of Maximum Reservoir Contact Wells in a Thinly Layered Carbonate Reservoir

Al-Mudhhi

Mark

Al-Hajari

et al. 2005

International Petroleum Technology Conference

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TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractPlacing a maximum reservoir contact well in a thinly layered reservoir has always been a challenge. Experiences showed that the well trajectory could easily be steered out of the target, necessitating expensive plug-back and redrilling operations to ensure that the well is drilled as planned. With the deployment of advanced LWD technologies, such as density image (DI), resistivity image (RI) and directional deep resistivity (DDR) logging tools, and high speed real time satellite data transmission, well paths can be geosteered from anywhere and kept in a thinly layered reservoir.The first Saudi Aramco field examples of utilizing RI and DDR are shown to demonstrate the added values of new technologies in geosteering difficult-to-drill wells. In some of the examples, images of density and resistivity are consistent and all could be used for geosteering. In other examples, wrong geosteering decisions would have been made had the DI been the only available tool. With the help of RI, reservoir contact of multi-lateral wells is increased. Examples also show that using DDR can prevent the well trajectory from being too close to the zero porosity rock layer or the underlying water.

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Section: Advanced Lwd Geosteering Technologiesmentioning

confidence: 99%

Geo-Steering with Advanced LWD Technologies - Placement of Maximum Reservoir Contact Wells in a Thinly Layered Carbonate Reservoir

Al-Mudhhi

Mark

Al-Hajari

et al. 2005

International Petroleum Technology Conference

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Geosteering in Umm Gudair Field With Simultaneous Density and Resistivity Images in Real Time (First Time in the World)

Gohain

Al-Anzi

Archibong

et al. 2007

SPE/IADC Middle East Drilling and Technology Conference

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TX 75083-3836 U.S.A., fax 1.972.952.9435. AbstractThe Umm Gudair (UG) Field is located in West Kuwait and is managed by Kuwait Oil Company (KOC). With the aim of draining oil from the undrained northern flank of the west UG area, KOC decided to drill UG-132H, an openhole horizontal producer.UG-132H was chosen as the replacement well for an abandoned well. Located in the northern flank of the field, UG-132H was placed approximately 450 m west of the abandoned well. The lateral drain hole objective of keeping the well at a minimum of 65 ft above the oil/water contact was achieved.Executing this strategic well required careful selection of casing programs, drilling tools, services, and teamwork from all departments to keep the well within the desired target. To achieve the objectives, the KOC team decided to utilize an advanced proprietary rotary steerable system, logging while drilling (LWD) Imaging technology and the geosteering services to properly place the well within the reservoir. The steerable System enabled smooth and timely drilling of the drain hole. This resulted in a smooth and in-gauge borehole, hence producing a favourable environment for acquiring good quality real-time images for accurate structural dip determination and well placement. This paper will focus on the well profile, and the benefits of the advanced rotary steerable system for the long drain hole section. It will also highlight the complementary nature of transmitting both the density image and resistivity image in real time to enable accurate steering decisions. It will also show how the LWD images were useful in characterizing the different facies within the reservoir.

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Utilizing Real Time Logging While Drilling Resistivity Imaging to Identify Fracture Corridors in a highly fractured Carbonate Reservoir

El-Gezeery

Al-Saqran

Archibong

et al. 2008

Abu Dhabi International Petroleum Exhibition and Conference

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The Minagish structure in southwest corner of Kuwait is a multi reservoir field. One of the potential reservoirs is the Mishrif formation. Developed as a limestone, sedimented in a mid-ramp environment, it generally consists of fine-grained packstones to wackstones that is highly bioturbated. The average thickness is about 300 ft with an average Net of 170ft in the upper layers. An average porosity value will be around 15% and permeability ranges between 0.001-17 mD. The oil in the Mishrif is highly viscous and production is normally enhanced by fractures in the upper Mishrif layers as they act as the main permeability conduit for the main storage below. The second Mishrif layer unit 2 (M9 & M8) is a fairly high porous peloidal packstone to grainstones sequence that is highly fractured at the upper 15 feet of the layer's "dual porosity system". The fracture corridors within the layer improve permeability, thereby making it a good potential for horizontal well placement. It was impossible to reach the observed production rates from matrix without one or two major fluid conductive fracture corridors. The main storage Mishrif layer unit 3 (M7 & M6) is within a 15% porosity layer that is 10–15 ft thick and contains a large volume of oil. Previous wireline image studies carried out identified these layers and their corresponding fractures, but because most of the studied wells were vertical, the fracture corridors could not be properly related to presence of faults in the field. This paper aims at showing how effective Logging While Drilling (LWD) resistivity images based on laterolog principle were useful in real time to identify the different layers within the Mishrif reservoir and establish the relationship between the fracture corridors and the intersected faults in a long horizontal well that posed a risk to data acquisition with standard wireline pipe conveyed logging. Introduction The Minagish (MN) field, in West Kuwait, is a North-South trending anticline (Fig.1) with hydrocarbons contained in six major reservoirs ranging in age from Early Jurassic to Late Cretaceous. The oil-bearing Mishrif/Rumaila limestone reservoir have been drilled and mostly appraised via wells dedicated to developing the Lower Cretaceous Minagish Oolite main reservoir which are estimated to account for up to 85% of the field's oil reserves. Mishrif is a tight layered, fractured reservoir of Cenomanian-Turonian (Upper Cretaceous) age developed over an asymmetrical anticline, dipping from east to west, the top of the formation was unconformable everywhere. Three main fault patterns were observed, defining three structural periods: EW and NS faults crossing the field in its central part during the Hith-Shuaiba period; mainly EW faults crossing the field in its central part during the Shuaiba-Ahmadi period; small NS faults in the north, EW trend en-echelon faults in the centre, NW-SE faults with a large extension in the south-west part of the field during the Ahmadi-Tayarat period. Most of the faults were generated during the Mutriba-Tayarat period (Turonian to Base Tertiary) but the trap formation of the Minagish field is post-Eocene. The recent Mishrif layering scheme divides the reservoir into 9 geological surfaces (time lines at field scale). There are two major sequence boundaries with exposure time, one at the top of the underlying Rumaila Formation and the other at the top of Mishrif (Fig.2). The lower part of the Mishrif consists of homogeneous mud dominated lithologies which is deposited in a slightly rimmed ramp environment. The upper part shows the occurrence of fine to very fine grained peloidal packstones to grainstones facies deposited in the more proximal shallower part of the ramp environment. The muddy sedimentation led to a very poor reservoir potential and the disappearance of porosity is due to heterogeneous cementation (nodules).

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Dip Interpretation from Resistivity at Bit Images (RAB) Provides a New and Efficient Method for Evaluating Structurally Complex Areas in the Cook Inlet, Alaska

Cited by 5 publications

References 0 publications

Geo-Steering with Advanced LWD Technologies - Placement of Maximum Reservoir Contact Wells in a Thinly Layered Carbonate Reservoir

Geo-Steering with Advanced LWD Technologies - Placement of Maximum Reservoir Contact Wells in a Thinly Layered Carbonate Reservoir

Geosteering in Umm Gudair Field With Simultaneous Density and Resistivity Images in Real Time (First Time in the World)

Utilizing Real Time Logging While Drilling Resistivity Imaging to Identify Fracture Corridors in a highly fractured Carbonate Reservoir

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