Miscellaneous Subsurface Methods 

 Future Developments 



673 



In some gas wells the collection of dust on the picture window during 

 the descent of the camera may present a difficulty not encountered in 

 liquid-filled wells. To overcome this difficulty a camera has been built 

 with an extra steel sleeve, which slides over the water chamber and camera 

 housing covering the picture window. When the camera reaches the point 



Figure 361. Some very fine porosity in upper half of picture and a leached stylolitic 

 zone at bottom of picture. There seems to be a distorted zone near top of picture 

 which may have been caused by movements of sediments while in a plastic state 

 (2,676 feet). 



in the well where the pictures are to be taken, the sleeve is released elec- 

 trically and slides down far enough to bring a hole in the sleeve into 

 register with the picture window. This device appears to be very workable 

 but has not been field-tested. 



A new, very compact camera has been built which is electrically 

 driven, uses 35-millimeter film, and takes 500 pictures 24 millimeters by 

 36 millimeters with one loading. These dimensions are more than three 

 times those of the pictures taken with the 16-millimeter camera. The new 



