576 



Subsurface Geologic Methods 



pictures are taken while the plumb bob and compass in the angle unit 

 are moving. These pictures are blurred and are not read since they are 

 not points on the survey. 



The same data that were available on a single-shot survey have been 

 derived from the survey film. Single-shot and multiple-shot survey compu- 

 tations are similar. A plan and vertical sections are drawn of the course 

 of the well and made into a comprehensive report which is sent to the 

 operator. Data included in a typical report of this kind are shown in 

 figures 301, 302, and 303. The report consists of a title sheet giving the 



Figure 297. Orienting transit and drill-pipe clamp. Engineer is preparing to read 



pipe-rotation angle. 



company name, the well name, the location of the well, and the type of 

 survey made. Record of survey sheets shows the measured and vertical 

 depths and rectangular coordinates of each point at which a reading was 

 taken on the subsurface survey. A horizontal plan depicts the course of 

 die well in a horizontal plane. Vertical sections in two planes show the 

 course of the well as if it were viewed from two sides. These drawings 

 and data sheets, all made on tracing paper or cloth so that they may be 

 reproduced, are bound in a survey folder and thus may be filed easily. 

 Affidavits are furnished if requested. 



