826 Subsurface Geologic Methods 



up begins until its completion. When properly submitted, this report be- 

 comes a composite file of all drilling and testing activities, geological in- 

 formation, and production data from which subsequent records and pert- 

 inent facts can be accurately obtained. Experience has shown that this 

 procedure of recording well data is the most satisfactory because it is pre- 

 sented in sequence, an arrangement which facilitates reference and allows 

 for complete recording of data in a compact form for filing. Too often 

 valuable well information is lost because there is no standardized procedure 

 for recording the data, or more often because important facts are registered 

 only in the mind of an individual. Consequently, at a later date certain 

 operations, previously performed, will have to be repeated. It cannot be 

 over-emphasized that no matter how insignificant a detail, it should be 

 recorded in the weekly chronological well report, for a triviality may be- 

 come an important fact at a future date. The report should be edited daily 

 from the daily drilling report. This procedure offers two distinct advan- 

 tages: (1) All the prevailing information is recorded immediately in order 

 to preclude the omission of small but possibly pertinent details; and (2) 

 when the report is due, only final typing of the master copy is necessary. 



The weekly chronological well report is to be presented in duplicate 

 form. Elite type is preferable. The report terminates each Monday at 

 7:00 a.m., or at some other convenient time, depending on the district 

 operations and prior agreement with the petroleum engineering and geo- 

 logical offices in the division covering the activities of the well for the 

 preceding week. The district geological, drilling, and petroleum engineer- 

 ing groups should become thoroughly familiar with this form and fully 

 cooperate in its preparation. One group is usually assigned the duty of 

 preparing this report. The contents should be checked by other interested 

 groups before they are typed in final form. 



A description of the report is included on the following pages with 

 a typed example illustrating the form which is to be followed. It should 

 be noted that these selected examples are not from a single well. All dis- 

 tricts must use the same patterns, as illustrated by the examples, to avoid 

 confusion. 



Information Required in Weekly Chronological Well Report 



Example 1 — Rigging Up — The progress of rigging up should be re- 

 ported from the time the rig is moved to the location until rigging-up 

 operations are completed. The first report on rigging-up operations should 

 state from where the rig was moved. See figure 415. 



Example 2 — Spudding — The time of spudding, date, size of bit, and 

 casing details, if any, should be given the day the well is spudded. 



At this time, a brief resume of the drilling program should be pre- 

 sented, giving the expected depths of the most important markers and/or 

 sand tops, as well as a separate paragraph stating the location of the well, 

 ground and rotary elevation, drilling A.F.E., objective, concession, classi- 

 fication (Lahees) , etc. See figure 416. 



