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The Wellsite Guide PetroPEP
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The Wellsite Guide Page 2 Introduction, What this text is about. This text addresses geologists who are going out to work as wellsite geologists in an offshore. or onshore location for the first time It gives instructions and a checklist type overview over. those wellsite operations which need geological input or supervision THE WELLSITE GUIDE is. not a sample description manual or geological data handbook It is assumed that the wellsite. candidate is first of all a geologist and knows owns and is capable of using the basic tool. kit of geological reference books log charts and computer utilities as far as they are of. relevance for the work Therefore no formulae graphs or similar material has been. incorporated into this text they are better quoted from the original references. THE WELLSITE GUIDE is rather meant as a briefing instruction to those geologists who are. new to the trade or only occasionally wellsitting or as a checklist for geologists who are. changing from one operator or operating area to another facing new concepts routines and. formats It is also tried to introduce and illustrate modern or future developments that may be. new to some old hands with no recent exposure to the actual work However owing to the. fast development of techniques and methods even this booklet will be outdated partly in very. short time, The Wellsite Guide Page 3 Introduction. I thank Dr Wo lfgang Monninger for his critical review of an early version of this text and many. constructive comments most of which were incorporated Thanks also to Mr Richard W ells for his editing. work on several chapters, Published On Line by PT PetroP EP N usantara. Version date 30 March 2010, File WGUID218 TXW, The Wellsite Guide Page 4 Introduction. 6 2 2 1 Tricks and Pitfalls 51, 6 2 3 Hydrocarbon Show Detection and.
List of Figures and Illustrations 6 Description 52. 6 2 3 1 Gas Chart Interpretation and, 1 The Job Description 7 Gas Shows 53. 6 2 3 2 Oil Show Detection 54, 2 Getting Mobilized 8 6 2 3 2 1 Odor 55. 2 1 Duties Responsibilities and Authorities 8 6 2 3 2 2 Stain and. 2 2 Office Preparation 8 Bleeding 55, 2 3 Materials and Equipment for the Wellsite Work 11 6 2 3 2 3 Acid Test 55. 2 4 Travelling and Arriving 13 6 2 3 2 4 Hot Water Test. 2 4 1 The Company Man 14 55, 6 2 3 2 5 Fluorescence. 3 On the Rig 14 56, 3 1 Safety 14 6 2 3 2 6 Cut and Solvent.
3 1 1 Helicopter Safety 15 Tests 56, 3 1 2 Hydrogen Sulfide H2 S 16 6 2 3 2 7 Acetone Water. 3 2 Working Space 16 Test 56, 3 3 Wellsite Psycho hygiene 17 6 3 Coring 57. 6 3 1 Selecting Coring Points 58, 4 Supervising the Mudlogging 18 6 3 2 While the Core is being Cut 58. 4 1 General Aspects 18 6 3 3 Core Retrieval 58, 4 2 Consumables and Spare Parts 20 6 3 4 Core Shipment 59. 4 3 Specific Checks 22 6 4 Pressure Engineering 61. 4 3 1 Gas Detection Equipment 23 6 4 1 Leak Off or Formation Integrity Test. 4 3 2 Other Checks in the Mudlogging Unit 26 63, 4 3 2 1 The Mud Pit Level Monitors 6 4 2 Pressure Worksheet 65.
26 6 5 Wellsite Biostratigraphy 66, 4 3 2 2 The Pump Stroke Counters 6 5 1 Foraminifera 67. 27 6 5 2 Nannofossils 67, 4 3 2 3 Hook Load Sensor 27 6 5 3 Palynology 67. 4 3 2 4 Kelly Height Indicator ROP 6 5 3 1 Fine Time Resolution 68. System 28 6 5 3 2 Environmental and Age, 4 3 2 5 Mud Flow In Out 29 Range 68. 4 3 2 6 Rotary Table Speed RPM 6 5 3 3 Some Typical Problems when. 29 working with Wellsite, 4 3 2 7 Torque 29 Palynology 69. 4 3 2 8 Mud Resistivity 30 6 5 3 4 Equipment and Sample. 4 3 2 9 Mud Temperature 30 Preparation 69, 4 3 2 10 Mud Density 31 6 6 Wellsite Geochemistry 69.
4 3 2 11 Standpipe Pressure 31 6 6 1 Pyrolysis Data 71. 4 3 2 12 Casing Pressure 32 6 6 2 Total Organic Carbon Content 71. 4 3 2 13 Heave Compensator 32 6 6 3 Types of Organic Matter 72. 4 3 2 14 H2 S Detector 33 6 6 4 Amount of Free Hydrocarbon 72. 4 3 2 15 Sample Oven 33 6 6 5 Migration 72, 4 3 2 16 Video Display 33. 4 4 Mudlogging Procedures and their Checks 34 7 Aspects of Drilling Practice and Technology 72. 4 4 1 The Mudlogger s Work Sheet 34 7 1 Rig Types 73. 4 4 2 Chart Recorders and Charts 34 7 2 Rig Components 73. 4 4 4 Daily Reports 36 7 2 1 Derrick and Lifting Equipment 74. 4 4 5 Lag Time Calculation and Cuttings 7 2 1 1 The Brakes and How to Drill. Transport 36 75, 4 4 6 Hole Cleaning 39 7 2 1 2 Rotary Table Drive Top. 4 4 6 Kick Pit Volume Drills 40 Drive 75, 4 4 7 Sample Collection 40 7 2 1 3 Motion Compensator 76. 4 4 8 Cuttings Sampling and Sample Interval 7 2 1 4 Swivel and Kelly Hose 76. 41 7 2 2 Drill String 76, 4 4 9 Calcimetry 42 7 2 2 1 Drill Pipe 77. 4 4 10 Shale Density 43 7 2 2 2 Heavy Weight Drill Pipe 77. 7 2 2 3 Bottom Hole Assembly, 5 Sample Material 44 BHA 78.
5 1 Routine Samples 44 7 2 2 3 1 Collars 78, 5 2 Other Sample Material 45 7 2 2 3 2 Subs 78. 5 3 Sample Shipment 46 7 2 2 3 3 Downhole, 6 Wellsite Geologist s Routines 47 7 2 3 Drill Bits 79. 6 1 Reporting 48 7 2 3 1 Tricone Bits 80, 6 1 1 The Master Log 48 7 2 3 3 PDC Bits 80. 6 1 2 The Daily Report 49 7 2 3 3 Classification and Grading of. 6 1 3 Ad hoc Reports 49 Bits 80, 6 1 4 Contribution to the Final Well Report 7 2 4 Mud and the Mud Circulation System 81. 6 1 5 Data Security and Confidentiality 50 7 2 4 3 The Mud Pumps 81. 6 2 Working with Cuttings Samples 50, 6 2 1 Sample Preparation 51.
6 2 2 Sample Description 51, The Wellsite Guide Page 5 Introduction. Flow Line and Solids, Removal 82 Appendix A Mudlogging Checklist and Technical Audit 129. 7 2 4 5 Trip Tank 82 135, 7 2 4 6 Mud Hydraulics 83. 7 2 5 Kick and Blow Out Control Equipment, 6 2 5 1 Kick During Connection 87. 7 2 5 2 Kick while Tripping 87, 7 2 5 3 Kick while Drilling 88.
7 3 The Art of Drilling 88, 7 3 1 Making Hole 89, 7 3 2 Depth Control How Deep Are We 89. 7 4 Mud Engineering 90, 7 4 1 Water based Mud Systems 92. 7 4 1 1 Lignosulfonate Muds 92, 7 4 1 2 Lime and Gypsum Muds 92. 7 4 1 3 Saltwater Muds 92, 7 4 1 4 KCl Muds 92, 7 4 1 5 Polymer Muds 93. 7 4 2 Oil based Mud Systems 93, 7 4 3 Mud properties 93.
7 4 4 Mud Filtrate Tracers 94, 7 6 Real Time Logging MWD LWD 95. 7 6 1 Benefits and Drawbacks of Real Time, Logging 100. 8 Decision Points in Drilling a Well 100, 8 1 Correlations and their Problems 102. 8 1 1 Faults 102, 8 1 2 Seismic Correlation 102, 8 2 Bit Selection 102. 8 3 Selecting Casing Points 103, 8 4 TD ing the Well 103.
9 Wireline Logging Supervision 104, 9 1 Preparations 106. 9 2 Depth Control 106, 9 3 When the Logging Job Starts 108. 9 4 Hole Problems while Logging 109, 9 5 The First Run 110. 9 6 Detailed Log Checks 110, 9 6 1 Gamma Ray Log 111. 9 6 2 Gamma Spectroscopy 111, 9 6 3 SP Spontaneous Potential 111.
9 6 4 Sonic Logging 111, 9 6 5 Full Waveform Sonic 112. 9 6 6 Resistivity Logging 113, 9 6 7 Density Log 114. 9 6 8 Neutron Log 114, 9 6 9 Dipmeter Log 115, 9 6 10 Velocity Surveys VSP Well Seismic. 9 6 11 Wireline Formation Testing 116, 9 6 12 Sidewall Cores 117. 9 7 Log Presentation and Quality Control 119, 9 8 Quick Look and Computer Based Log Evaluation.
9 8 1 The R w a Check 121, 9 8 2 Density Neutron Logs 121. 9 9 Money Checking the Service Ticket 122, 10 Data Integration and Interpretation at the Wellsite 122. 10 1 Temperature Analysis 122, 10 2 Tie to Seismic 123. 11 Computer Electronics and Communication 123, 11 1 Data Formats 124. 11 1 1 The LIS Format 124, 11 1 2 The DLIS Format 124.
11 2 Software 125, 11 3 Data Media 125, 11 4 Data Transmission 126. Literature 126, Alphabetical Index 127, The Wellsite Guide Page 6 Introduction. List of Figures and Illustrations, Figure 34 The basic terminology on deviated wells 97. Figure 2 Think of power cables for the computer gear Rig Figure 35 True vertical thickness and true stratigraphic. plugs may not have the same voltage or connector thickness in relation with a uniformly dipping. like in the office 12 stratigraphic unit 98, Figure 3 Beware of tail rotor Always go to the side or front Figure 36 A View of a skid mounted logging unit Atlas. when boarding or leaving the helicopter 15 Wireline 106. Figure 4 A view of a mudlogging unit The components of Figure 37 Log presentation main log of the Dual Induction. the unit may be arranged differently but the Log SCHLUMBERGER 114. principle remains the same 18 Figure 38 Four examples of the more common signal quality. Figure 6 Sensors commonly found in modern mudlogging problems frequently seen in VSP and checkshot. systems 22 acquisition 116, Figure 7 The principle of the gas trap for ditch line gas Figure 39 Wireline testing tool RFT in open position.
extraction 23 117, Figure 8 The gas trap installed at the possum belly tank Figure 40 Parts and options of the SFT tool Halliburton. Figure 9 Acoustic pit volume sensor The sensors measure Figure 41 Log presentation 120. the time taken for each pulse to echo back from the. mud surface in the pit 26, Figure 10 An acoustic pit level sensor system installed over. a mud pit 26, Figure 11 Pump stroke sensor 27, Figure 12 A mechanical hook load transducer 27. Figure 13 A hook load sensor transducer system based on. hydraulic pressure measured at the dead end of the. drill cable 28, Figure 14 Paddle type mud flow out sensor Halliburton. Gearhart 29, Figure 15 Torque Sensor Anadrill 29, Figure 16 A simple mud conductivity probe with a graphite.
electrode dip cell 30, Figure 17 The hydraulic transducer of a heave. compensation system 32, Figure 18 The H2 S panel in the mudlogging unit consists of. several such displays Each one for one sensor, location 33. Figure 19 Laminar flow arrows indicating relative velocity. of the mud 38, Figure 20 Core as boxed and marked for despatch to the lab. Figure 21 Fluidisation of unconsolidated formation 60. Figure 22 Core deformation by mud invasion into the core. Figure 23 Proper labelling and marking of core and core. box Black line right red line left arrows up 61, Figure 24 Schematic Diagram of a leak off pressure plot.
Figure 25 A semisub drilling rig twin hull type 74. Figure 26 View of a drill ship 74, Figure 27 The draw work the other main parts of the. hoisting equipment 75, Figure 28 Slips Used to hold drill pipe in the rotary table. Figure 29 Tools used to make connections After the tool. joint has been broken with the tongs the pipe, may be unscrewed by further by turning the rotary. or by using a spinning wrench 77, Figure 30 The drill stem and its components Note that cross. overs and other parts are not shown 78, Figure 31 Two types of tricone bits The bit on the left is a.
bit for soft to medium hard formations The bit on, the right a high performance insert bit for hard to. very hard formations 80, Figure 32 Cutting action of PDC bits 80. Figure 33 Ram type blow out preventer 87, The Wellsite Guide Page 7 Introduction. 1 The Job Description, The work of the wellsite geologist is defined in the following by one major operating oil company. The wellsite geologist as the source of all operational geologic information is the most. important link in the chain of communications between wellsite and management The. importance of the wellsite geologist to the overall successful termination of any project whose. aim is to find hydrocarbons for exploration cannot be overstated He is the exploration. department s man on the spot upon whose shoulders rests the responsibility for obtaining of. insuring that every possible scrap of information which can be wrested from the earth and. insuring that the data are transmitted to the office in a concise but comprehensive coherent. It is the wellsite geologist s duty to confer regularly with the company s wellsite drilling. operations representative company man on location to forestall misunderstandings and to. insure that the maximum information is obtained at the most economical price Foresight. training and a working knowledge of drilling equipment terminology and personnel are. necessary to bring this to fruition, The wellsite geologist under the direction of the Company Operations Geologist1 is responsible.
for all geology and geologically related administrative wellsite activity. Depending on the company he is working for the wellsite geologist may also be responsible for certain. work in the company office such as compiling reports relaying routine reports to partners and. maintaining contacts with various contractors, The position of an operations geologist may not be filled in a particular organization The wellsite geologist reports in this. case to the area geologist the senior or chief geologist. The Wellsite Guide Page 8 Preparation, 2 Getting Mobilized. 2 1 Duties Responsibilities and Authorities, Before you travel to the field find out what your duties and responsibilities on location will be As a. wellsite geologist you should know exactly what is expected of you and how and when your reports to. be submitted, Who is your supervisor Whom do you report to Make sure that you and your supervisor. understand the relationship It is very cumbersume to be on a rig and having different people. calling and trying to tell you what to do, What sort of daily reports will be used for the project What are the reporting deadlines Some.
companies report at midnight so that the report is in the office at 6 00 AM in the morning. Others expect their reports to be up to date as of 6 00 AM and expect an abridged update in the. The Wellsite Guide Page 2 Introduction What this text is about This text addresses geologists who are going out to work as wellsite geologists in an offshore or onshore location for the first time It gives instructions and a checklist type overview over those wellsite operations which need geological input or supervision T HE W ELLSI TE G UIDE is not a sample description manual or geological

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