This figure shows the difference in real time resolution of azimuthal resistivity data
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- Olivia Webster
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2 This figure shows the difference in real time resolution of azimuthal resistivity data with Sperry s AFR tool. The log on the right shows the IXO transmitted data in realtime and the log on the left shows the same data using mud pulse telemetry. The IXO offers real time bed boundary definition with much more clarity than was achievable before with conventional telemetry techniques. Normally you would only get this kind of result with a recorded log or wireline. 2
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4 Stress the achievements, the uniqueness of the technology 4
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6 In general, The IntelliServ Network system is composed of four main components (wewillseetheminmoredetaillater). The Interface sub connects to the MWD/LWD and RSS tools to allow bi directional communication of logs and commands. The IntelliLinks boost the signal to ensure a proper signal to noise ratio and avoid data loss. They also allow for measurements to be taken at their position on the wellbore. The measurement included with the first generation IntelliPipe is temperature (in the Link). The IntelliPipe is the heart of the system, it allows high reliability data transmission through the drill pipe. The top drive swivel allows for data to be extracted to the surface system while the drill pipe rotates. 6
7 The IntelliServ network is an open Network where anyone can connect to take advantage of its capabilities Each service company manufactures an Interface sub jointly with IntelliServ. The Interface sub, which is owned by the service company, allows bi directional communication from the network to the downhole tools. Data from the downhole tools is then delivered on surface to the service company via the IntelliServer TM. This way making IntelliServ transparent for the data recipient. 7
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9 The heart of The IntelliServ Network is the high speed telemetry drill pipe. Each joint of drill pipe is modified for high speed communications by use of inductive coils installed on pin and box secondary shoulders. The coils connect to a high speed, high strength data cable that is anchored at the pipe joint, The cable exits to the internal diameter of the tubular at the upset and runs under tension along the inside of the pipe without affecting drill pipe properties. Once made up, the coils come near each other and induce the signals down the pipe withoutdirectcontact. The heart of the system is the IntelliPipe. It transmits data from one end to the other of the pipe by way of a set of patented inductive coils that are connected to a highstrength, high speed steel cable. The cable is connected to the coils through a small conduit inside the pipe connection. (next slide) 9
10 Please observe how the IntelliServ technician will extract the information from the Network as the pipe is being tripped in without adding any extra time to the process. With battery powered LWD tools now available, we are able to obtain all the LWD measurements through this means also 10
11 Jet sub NOV Jar RSS and LWD 11
12 A key component of The IntelliServ Network is the Top Drive Interface Swivel which provides the interface between rotating and stationary environments. It is installed atthelowerendofthetopdriveassembly(oftenreplacinganexistingsaversub),and consists of a telemetry enabled sub inductively coupled to a non rotating member. Network traffic moves through the sub and into the swivel, which in turn is connected to IntelliServ s data acquisition system via surface cabling. 12
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22 Courtesy of Baker Hughes Inteq. This is an image of what a formation image log will look like when transmitted over the IntelliServ Network rather than a few curves, full, uncompressed images will be available in real time. 23
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26 From the Drilling Optimization and risk reduction perspective here is an example where Formation Evaluation measurements are used for drilling. An advantage of the use of drill string telemetry is that images are not compressed when they are transmitted up the hole. If you look at the two images on the left you notice that the Wired pipe image shows some black vertical stripes on the image that the mud pulse image does not show. The dark stripes are a depiction of hole break out or damage that is critical to understand when assessing hole degradation. The compression algorithms on the mud pulse on the left actually hide some of this and are not optimum for interpretation. The image on the very right shows how the hole looks fully degraded after a number of days of drilling. Evaluating this allowed BP to save a casing string which can potentially have a positive impact in the safety and risk evaluation on how wells are drilled. 27
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28 The graphic that you see on the screen is a comparison of an actual well s petrophysical logs acquired while drilling in Real time with both mud pulse technology on the left and with IntelliServ technology on the right. The images and analysis are provided courtesy of Halliburton and we really appreciate them letting us use this example. The image on the right is actually the very first petrophysical log transmitted in real time over the IntelliServ Network. These logs were recently acquired in Oklahoma during the drilling of a test well prior to expected commercial applications. I would like to bring your attention to a few interesting facts around this image: The first one is the one you can t see. All of the commands sent down to downhole tools during the drilling of this formation were executed instantaneously. This was simultaneous to the acquisition of the data. Please note that by use of the Networks bandwidth, the driller would not have to drill slower in formations that are usually fast to drill. These images were obtained while drilling at around 100 ft/hr. All data comes up hole in Real Time and uncompressed. All the curves are present and this allows for true Real Time interpretation of features as small as the ones you see here in most cases improving the visibility of vertical and wellbore lateral characteristics The white image bar represents the pipe in sliding mode (no rotation) where no images needed to be acquired. 29
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30 Commercial work (Pemex) Underbalanced, hard formations MWD PWD Vib DGR EWR4 GeoPilot Slow drilling with lots of vibration 2 vibration related failures (one with Sperry, one with Intellipipe ) When Intellipipe failed mud pulse took over without problems Logistical issues with having Intelliserv computers away from M/LWD computers (cables and interference) Some problems related due to inexperience of Intelliserv personnel (no rig experience) Some small problems related to learning on all sides 31
31 A real stress test to the IntelliServ technology. A horizontal well which Geosteering was planned around the presence of the IntelliServ Network. This reservoir presents total fluid losses while drilling through it and The IntelliServ Network provided data from the MWD, LWD and Rotary Steerable tools at all times. The reservoir section alone took 45 days to drill in extreme (but within specification) conditions for the Network. The Network worked for about 45 days in this environment with no issues to transmit data. 32
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34 Statoil saved two days rig time by saving trips. The first trip was saved by confirming through the Network that all systems operated properly as the drill string was not building enough angle. Rather than tripping, the drilling team confirmed that there was no risk in falling behind the curve and continued to drill. A second trip was saved after irregular torque on the drillstring appeared as a reamer not opening the hole to the desired diameter. By pulling up to the suspicious zone and logging a caliper log in real time, the hole gauge was confirmed to be as planned. The only other method to confirm that a reamer works is to pull out and physically check the tool. 35
35 Baker INTEQ s, At Balance and IntelliServ technologies were combined to engineer a constant bottom hole pressure system with Real Time feedback. In this case the systems were modified to acquire the annular pressure while drilling measurement with the MWD, transmit it to surface via IntelliServ, feed the measurements to the Dynamic annular pressure control system which commands a back pressure setting in less than 10 seconds lag time. The Principal purpose for the use of these integrated technologies is to eliminate the risk of gas accumulating in the annulus. The Shoe strength is the weakest point in the designed open hole. Given this, in case of an influx, there was no tolerance to shut in the well which would break the shoe and cause a complex well control problem. The drilling margin in this case was only of about 200 psi. IT WAS CRITICAL NOT TO EXCEED THAT DRILLING MARGIN. 36
36 Once the system operates, please note at the blue line which is the measured bottom hole pressure which stays within 5 10 psi of it s average even during connections. The blue line is also usually a collection of dots since the annular pressure is usually sent up hole only every few minutes. In this case it is a continuous line of measurements every 2 seconds. The measurements can also be taken when no circulation present thanks to a Baker INTEQ downhole battery pack which powers the pressure sensor system even when no flow is present. This is an example of drilling with 3 connections included where the system compensated for the reduction of ECD by applying the backpressure where needed. Note that although the backpressure was set to remain constant during drilling, the BHP does not exceed the 150 psi limit set by the drilling team. This is a good opportunity to remind all of us that there were only 6 minutes to react to any influx and that the modified complete system as implemented had a total turn around time of about 10 seconds. 37
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