6 MUDLOGGING NOTES
9.8 MUDLOGGING QUALITY CONTROL CHECK LIST
Services Carried Out: (Underline for each type performed this period)
Total Gas Detection Chromatographic Analysis
Mudlog Calcimetry
Drill Depth and Rate Recording Shale Density
Cuttings Gas Detection Other Describe)
Monitoring of Drill Parameters Sample Description Show Analysis
Service company Mudlogging Unit Chief checks all items applicable to the operation, and discusses any items checked "no" with the Wellsite Geologist. Mark "not applicable" (N/A) if necessary.
Underline any No items and provide comments
TOTAL GAS DETECTOR 1. Is it reliable?
2. Does the gas warning alarm work at the required reading?
3. Were filaments changed immediately on drift occurrence?
4. Are ample spare filaments available?
5. Were carbide returns of sufficient magnitude for determining hole condition?
6. Has the sample flow rate been regular?
7. Have regular calibrations been made?
8. Have the H2S detectors and alarms been operating?
9. Have regular calibrations of the H2S detectors been made?
CHROMATOGRAPH ANALYSIS 10. Have regular calibrations been carried out?
11. Is there (on hand) a supply of known mixtures of hydrocarbon gases from methane to pentane?
12. Are both chromatograph FID’s suitably responsive to all gases listed above?
13. Are carbide returns readily recognisable?
14. While drilling through any shows, has the sensitivity been at the optimum?
15. If the recorder has a variable rate, was it switched to fast rate during significant shows?
16. Has the mud gas chromatograph been working continuously while drilling and circulating, and has the cuttings gas chromatograph been working satisfactorily?
17. Have you been able to make all necessary repairs when the instruments malfunction?
MUD TRAP AND LINES 18. Is the gas trap located in the optimum position?
19. Can the gas trap be located elsewhere in the mud stream to advantage?
20. Has such experimentation as indicated above been made?
21. Is the gas trap cleaned and inspected regularly?
22. How many days since the gas trap was attended to? ... Days
23. Are the gas lines examined regularly for leaks and internal condensation?
24. How many days since gas lines, filters and moisture traps last cleaned out and checked? ... Days 25. Does the automatic blowback system operate efficiently and regularly on a thirty minute cycle?
26. Does the alarm system operate automatically when the gas lines are broken or plugged, or the agitator motor fails?
DRILL DEPTH AND DRILL RATE RECORDING
27. Is the recorder reliable when compared with drilling contractor's Geolograph and pipe tallies?
28. If the recording is motion compensated, is the system working satisfactorily?
29. Has the recorder been operating continuously during drilling?
30. If the answer to the above is "no", were repairs affected immediately so as to minimise loss of data?
SAMPLE CATCHING 31. Is the chart range on the Mudlog suitable for the rate of penetration?
32. Are samples being caught by your crew at the intervals specified in the Drilling Programme?
33. During fast drilling were samples caught at intervals specified by the Wellsite Geologist?
34. Have carbide lag checks been made at regular intervals?
35. Are samples being correctly lagged with reference to pump stroke data and the regular carbide or other check?
36. Have cuttings gas measurements been made at the intervals specified in the Mudlog Programme.
37. When a significant show has been detected by the unit, have samples been examined for fluorescence and cut before and after washing?
38. Have the samples been caught, dried and packaged to the satisfaction of the Wellsite Geologist and in compliance with the Drilling Programme?
39. Have the ditch samples been caught from a special sample box or sampling system?
40. Have the ditch samples been caught off the shaker screen?
41. Has the desander output been regularly checked, particularly when there have been poor sample returns from the shaker screen.
SAMPLE DESCRIPTIONS
42. Have the lithological descriptions entered on the Mudlog been described by the Mudlogging Engineer?
43. Have the lithological percentages on the Mudlog been agreeable to both the Mudlogging Engineer and Wellsite Geologist?
44. Is the microscope and ultraviolet light operating reliably?
45. Are adequate spare parts available for the microscopes and ultraviolet light(s)?
MUDLOGGING REPORTS
46. Have Mudlogging reports been prepared as required, with all relevant data listed and been delivered to the Wellsite Geologist at the appointed time?
47. Have the Afternoon Reports been prepared as required?
MUDLOG
48. Does all pertinent data required by The Operator including mud data, lithology and drilling data appear the Mudlog?
49. As time permits, has the Mudlog been kept up to date so that the Wellsite Geologist can easily appraise the status of the well?
50. Has the Wellsite Geologist been supplied, on request, with copies of the Mudlog before 0600 hours each day in time for transmission to Perth, if such means are available?
MUD DATA
51. Have mud properties been obtained from the Mud Engineer once every twelve hour tour in accordance with the Drilling Programme?
SHOW EVALUATION
52. Was a show evaluation sheet prepared after each significant show was encountered?
53. During the evaluation of any drilling break, was the Wellsite Geologist supplied with all necessary information to reach a conclusion with a minimum of lost rig time?
GENERAL
54. Is there on hand in the unit copies of the Drilling Programme and the Contract between your company and The Operator so that technical and contractual obligations are clearly understood?
55. Have shale density measurements been made at the intervals specified by the Drilling Programme?
56. Has the shale density column been calibrated this week?
57. Have calcimetry measurements been made at intervals specified by the Drilling Programme?
58. Has the calcimeter been calibrated every second day?
MONITORING OF DRILLING PARAMETERS
59. Have the following drilling parameters been continuously monitored in the Mudlogging Unit, for input to the data unit? If the answer is "no" indicate how long in hours, and if possible briefly describe the cause and corrective action?
60. Has the weight on bit been continuously computed by the mudlogging unit instruments from monitored data?
OPERATIONAL EFFICIENCY CHECK - ITEMS
(To be completed by the Wellsite Geologist) 61. Rig time lost due to breakdown of equipment: Hours
62. Data lost due to breakdown of equipment: Hours
63. Type of logging or mechanical equipment broken down:
64. Were the items checked "no" by the Mudlogging Engineer corrected if possible?
65. Were the above items discussed with you?
66. Has the unit been manned at all times while drilling or coring through hydrocarbon zones?
67. Has the unit been manned at all other times in accordance with the Mudlogging Programme and the Contract?
68.Rating of service (underline appropriately):
Good Fair Poor Indifferent
Remarks:
Mudlogging Unit Chief:
Wellsite Geologist:
DATA UNIT
The following to be completed by the Data Unit Chief, and any items checked "no" discussed with the Wellsite Geologist and the Wellsite Manager (Drilling Supervisor), and suitable remarks attached at the end of the questionnaire.
DATA UNIT OPERATION
71 Has the computer been operating satisfactorily?
72 Have all data terminals been functioning normally?
73 Has the plotter(s) been operating correctly and accurately?
74 Has the display panel functioned normally?
75 Have all required monitored input data been received from the mudlogging unit multiplexer?
76 Have the following computed drilling parameters been generated and displayed continuously?
• Porosity
• Effective circulating density
• "dc" exponent
• Fracture gradient
• Pore pressure
77 Are all batch programmes for drilling and formation evaluation satisfactory in terms of flexibility and range of performance in accordance with The Operator’s requirements?
PRESSURE LOG
78 Does all pertinent data required by The Operator appear on each Pressure Log sheet?
79 Has the log been kept up to date so the Wellsite Geologist and Wellsite Manager (Drilling Supervisor) can immediately appraise the status of the well?
80 Has the Wellsite Geologist/Wellsite Manager (Drilling Supervisor) been supplied, on request with the Pressure Log sheets before 0700 hours each day for transmission to the office, if such means are available?
81 Has the Wellsite Geologist/Wellsite Manager (Drilling Supervisor) been supplied with copies of the Pressure Log as requested?
REMARKS
Data Unit Chief:
Wellsite Geologist:
APPENDICES
1 Interpretation of Mud Gas Ratio Data
The following is a brief summary of interpretations attached to the values obtained from the various calculations. The mudlogging Contractors usually have a manual which describes these ratios in more detail.
Wetness Ratio (GWR) = C2 + C3 + C4 + C5
---C1 + C2 + C3 + C4 + C5
GWR <0.5 dry
0.5.17.5 gas potential 17.5.40 oil potential
>40 residual oil
Light to Heavy Ratio (LHR) = C1 + C2
---C3 + C4 + C5
Oil Character Qualifier (OQR ) = C4 + C5
C3
2 Roundness and Sphericity, Percentage Estimation
See separate file (wsgman_OMV_app_2).
3 Wellsite Geologist Supplies Inventory
Note: the ability to re-supply and other factors necessarily dictate the level of supplies held at wellsite. This list is solely a guide.
1. Drilling Programme
8. Microscope plus: spare bulb, light source, spare eye pieces, eye cups 9. Offset well data - Litholog, Mudlog 1:500, Composite Log 1:1000 10. Rock Colour Chart
16. 1 x OLFA cutter and blades
17. Clipboard
18. Assorted Post-it Note pads 19. 1 x box 32mm Foldback clips 20. 1 x box HP pencils
21. 1 x pencil sharpener 22. 1 x stapler plus staples 23. 1 x box Artline 200 pens 24. 2 x black Artline 70 pens 25. 1 x red Artline 70 pens 34. 1 x roll brown packing tape 35. 1 x Glue Stick