8-10 Well Logs I

8-10 Well Logs I - Well Logs I Introduction to Drilling and...

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Well Logs I Introduction to Drilling and Well Logging Well Logs I Introduction to Drilling and Well Logging Asquith,George, 1982, Basic Well Log Analysis for Geologists , Am. Assoc. Petrol. Geol.,p. 20
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Well Logs I Introduction to Drilling Rigs – Rig set up – Drilling column Introduction to Well Logs – SP Log – Resistivity Logs – Neutron-Density Log – Sonic Log – “Archie Equation” - water saturations – Dipmeter Logs
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Rotary Drilling Rig http://www.consrv.ca.gov/dog/picture_a_well/PublishingImages/DRILLING-RIGnew.gif http://www.planooilandgas.com/images/pog/WilliamsRigFloor1_medium.jpg
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Mud Circulation System Fundamentals of Petroleum , 3rd ed., Copyright 1973, Petroleum Extension Service, The University of Texas at Austin., p.31
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Tricone Drill Bits Selley, Richard C.,1998, Elements of Petroleum Geology, Academic Press, p. 41, http://www.deskeng.com/pics/0209/tricone-bit-HPC_305.
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True Vertical Depth Laudon, Robert C., 1996, Petroleum Development Geology, Prentice Hall, p. 49 Depths = measured from top of the Kelly Bushing (KB) (about 1’ above the drilling floor) In most cases: TVD = MD Caution TVD < MD when: a) Rocks are folded b) Directionally drilled holes
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Action of Drilling Mud Laudon, Robert C., 1996, Petroleum Development Geology, Prentice Hall, p. 51 Drilling mud: 1- prevents ‘blow-outs” by coating the hole with mud filtrate 2- invades and flushes area around the drill hole. Q - Which fluid is in the uninvaded zone. . . - Water? - Oil? - Gas?
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Well Log Formats • Left Side Curves – SP Log: Spontaneous Potential – GR Log: Gamma Ray Curve • Right side Curves – Resistivity Devices: Induction Logs – Sonic Logs – Density Logs – Neutron Logs – Dipmeter Logs
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Spontaneous Potential - SP Log First run in 1927 Measures passive natural battery effect: - electric potential (mv) set up between an electrode in a sonde drawn up the borehole and a fixed electrode at the earth’s surface. - Open holes only! Helpful to determine lithology and permeability of rock Selley, Richard C.,1998, Elements of Petroleum Geology, Academic Press, p. 55,
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Spontaneous Potential - SP Log sum of 2 potentials that exist between: 1. Rock fluids in interconnected rock pores 2. The fluid in the borehole Permeable rock Sandstone or Limestone = 1. Negative in saline fluids 2. Positive in less saline/fresh Nonpermeable rock
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This note was uploaded on 09/26/2011 for the course GEOL 3413 taught by Professor Hileman during the Spring '11 term at Oklahoma State.

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8-10 Well Logs I - Well Logs I Introduction to Drilling and...

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