Duties and Reports of the Subsurface Geologist 835 



All pertinent geological and mechanical data are drafted on the log, which 

 is then reproduced and distributed among parties interested in the well. 

 The following set of instructions has been included in the Geological Pro- 

 cedure Guide of the Creole Petroleum Corporation and is submitted as 

 being one method of log preparation which has proved very useful in 

 Venezuelan operations. Completion logs are usually drafted on the 1 :500- 

 scale electrical log. This scale is commonly adopted by all companies 

 operating in that country. 

 .01 Heading 

 .011 Well Data 



a. Wrico lettering guides are used in the drafting of well number, 

 field, name of operator and/or owner, and scales. 



b. All other data on heading exclusive of map is prepared in capital 

 letters with a typewriter having a good ribbon. A piece of carbon 

 is placed behind the log heading in such a manner that the letters 

 are typed on both sides. An Ozalid opaque typewriter ribbon may 

 be used. 



0. "COORDINATES," "ORIGIN," "GRID," "STATE," "DIS- 

 TRICT," and "CONCESSION" are otained from the district's 

 "Well Number Assignment" letter, or the well's location plat. 



d. "SPUDDED" and "LP." established are the dates, expressed in 

 month, day and year (in that order) in which these events oc- 

 curred. This date should coincide with the date I. P. was estab- 

 lished, as stated at the foot of the log. Month should be expressed 

 by abbreviation rather than numeral. 



e. "GD. ELEV." is the elevation in feet above sea level of the location 

 as obtained from the Engineering Department. 



f. "R. T. ELEV." is the height in feet above sea level of the rotary 

 table, as determined by the type of foundation on lake wells — 

 obtained from the engineering deparment for land operations. 

 The district's "Well Number Assignment" letter is also consulted 

 for rotary-table elevation. 



g. "BRADEN HD. ELEV." is height in feet above sea level of the 

 Braden head. 



h. "T. D." is the depth of the hole in feet upon completion of the well, 

 as measured from the rotary table. 



i, "P. B." is the depth, in feet, of the top of the uppermost plug back 

 or bridge plug. When there is no plug in a well and, therefore, no 

 entry to be made after "P.B.," a dash is entered to indicate that 

 nothing has been omitted. 



j. "TYPE OF COMPLETION" indicates the type of completion, nor- 

 mal, dual, or triple zone, effected in the well. 



k. "PRODUCING UNIT" is the stratigraphic name of the section 

 open to production. The unit or units producing through the casing 

 are listed under "CASING," whereas those open through the tub- 



