Coreless Electromagnetic Coupling-Based Drillstem Telemetry Using Dual Electronic Gauges
- Tianhuai Ding (Tsinghua U.) | Li Cheng (Tsinghua U.)
- Document ID
- Society of Petroleum Engineers
- SPE Production & Operations
- Publication Date
- February 2007
- Document Type
- Journal Paper
- 128 - 134
- 2007. Society of Petroleum Engineers
- 1.12.1 Measurement While Drilling, 4.1.2 Separation and Treating, 4.3.4 Scale, 2 Well Completion, 7.4.3 Market analysis /supply and demand forecasting/pricing, 4.1.5 Processing Equipment, 1.6.1 Drilling Operation Management, 1.10.1 Drill string components and drilling tools (tubulars, jars, subs, stabilisers, reamers, etc), 5.6.4 Drillstem/Well Testing
- 2 in the last 30 days
- 358 since 2007
- Show more detail
- View rights & permissions
|SPE Member Price:||USD 5.00|
|SPE Non-Member Price:||USD 35.00|
A coreless electromagnetic coupling-based telemetry system for well-test data involving a full-bore drillstem test apparatus has been developed. This system allows the retrieval of formation pressures and temperatures above and below a tester valve by means of a wireline-conveyed electronic gauge and a permanently installed gauge. A wireline-deployed coreless electromagnetic proximity sonde is put into the well to transfer the data using time-division frequency transmission technology in the "Synchronization-Pressure-Low-Temperature-Low?? mode on a single-core wired-armored cable. The coded pulse data are modulated on DC power signals. The surface processor uses a double-counter synchronization method to measure signal frequencies to eliminate ±1 most significant bit (MSB) error. Then a simplified algorithm is proposed, based on least-squares curve fitting and dimension-reduction methods, for computing actual temperatures and pressures for analysis of well-testing data. The proposed system is calibrated for temperatures up to 125°C and pressures up to 70 MPa with a pressure accuracy of 0.1% full scale (FS) and temperature accuracy of ±0.5°C. This approach combines the advantages of drillstem testing and wireline formation testing and has been successfully applied to onshore well testing.
In oil and gas well testing, it is important to obtain accurate real-time pressures and temperatures from the bottom of a well. The need for surface-to-downhole communication in this context has long been recognized, and many techniques have been proposed, including wireline telemetry (Whittle et al. 2003), permanently installed downhole monitoring systems (Veneruso et al. 2000), and wireless telemetry ("Electromagnetic?? 200l; Tochikawa et al. 1996). The wireline telemetry system provides higher data rates than other currently used methods. However, it requires that the sensitive measurement gauges endure long-term exposure to an extremely hostile environment. The permanently installed downhole monitoring system records data in a module that is retrieved after the tubing is lifted from the hole. However, this method makes it difficult to collect real-time data. Wireless telemetry involves either extremely low-frequency electromagnetic (EM) wave transmission through the formation or acoustic transmission through the drillstring. The propagation of EM waves is characterized by an increase in attenuation with increases in distance, data rate, and ground conductivity (Trofimenkoff et al. 2000). Therefore, current EM telemetry systems are practical only for land operations where the resistivities are greater than 1 ohm-m and the target formation is shallow (Soulier 2003). Though Halliburton has recently developed an acoustic telemetry data acquisition system (Harperet al. 2003), it is limited by its high energy consumption and the complicated problems caused by the lengthwise variations of drillstems. This paper describes a coreless EM coupling-based telemetry system equipped with two electronic gauges which provide users with access to real-time downhole data above and below the tester valve during drillstem testing operations.
|File Size||1 MB||Number of Pages||7|
Ding, T.H. et al. 2000. DownholeCoreless Electromagnetic Coupling Communication Device. China: Patent No.00,100,553.
Ding, T.H. and Li, C. 2004.Electromagnetic Coupling-Based Downhole Remote Telemetry in Well Testing. Paperpresented at the 3rd International Symposium on Instrumentation Science andTechnology, Xi'an, China, 18-22 August.
Electromagnetic MWD Telemetry System SetsDepth Record Offshore. 2001. Oil & Gas J. 100 (36):46-47.
Harper, G., Almanza, E., Fossa, A.,Finley, D., and Strang, G. 2003. Implementation of Advanced AcousticTelemetry System Adds Value and Efficiency to Well Testing Operations.Paper SPE 80544 presented at the SPE Asia Pacific Oil and Gas Conference,Jakarta, 9-11 September. DOI:http://www.spe.org/elibrary/servlet/spepreview?id=80544-MS.
Qureshi, Y., Gunarathne, G.P.P., andChristidis, K. 1999. Dynamic Impedance Matching of Transmission Cables forDownhole Tools. IEE Colloquium (Digest) 143: 47-51.
Soulier, L. 2003. Method and System forThe Transmission of Information by Electromagnetic Waves. U.S. Patent No.6,628,206.
Tochikawa, T., Sakai, T., Taniguchi, R.,and Shimoda, T. 1996. AcousticTelemetry: The New MWD System. Paper SPE 36433 presented at the SPE AnnualTechnical Conference and Exhibition, Denver, 6-9 October. DOI:http://www.spe.org/elibrary/servlet/spepreview?id=36433-MS.
Trofimenkoff, F.N., Segal, M., Klassen,A., Haslett. J.W., Smallwood, R.E., and Lehner, D. 2000. Characterization of EMDownhole-to-Surface Communication Links. IEEE Trans. Geosci. RemoteSensing 38 (6): 2539-2547.
Van Riet, E.J., Reitsma, D., andVandecraen, B. 2004. A FullyAutomated System Accurately Controls Downhole Pressure during Drilling.JPT 56 (2): 42-44. SPE-85310-PA. DOI:http://www.spe.org/elibrary/servlet/spepreview?id=85310-PA.
Veneruso, A.F. 1990. Apparatus forElectromagnetically Coupling Power and Data Signals Between a First Unit and aSecond Unit and in Particular Between Well Bore Apparatus and the Surface. U.S.Patent No. 4,901,069.
Veneruso, A.F., Hiron, S., Bhavsar, R.,and Bernard, L. 2000. ReliabilityQualification Testing for Permanently Installed Wellbore Equipment. PaperSPE 62955 presented at the SPE Annual Technical Conference and Exhibition,Dallas, 1-4 October. DOI:http://www.spe.org/elibrary/servlet/spepreview?id=62955-MS.
Whittle, T.M., Lee, J., and GringartenA.C. 2003. Will Wireline FormationTests Replace Well Tests? Paper SPE 84086 presented at the SPE AnnualTechnical Conference and Exhibition, Denver, 5-8 October. DOI:http://www.spe.org/elibrary/servlet/spepreview?id=84086-MS.