Laserfiche WebLink
The Forma ion Density Too ig. 3) is a nuclear measuring devi~ It utilizes a gamma ray <br />source and gamma ray detector. The source and detector are shielded from each other so that few <br />Figure 9. Fcaii~ion Drn,i[y Tool, <br />gamma rays can migrate through the tool itself, from source [o detector. The tool goes into the <br />hole as a straight [ooi and may be put into a ]o-aging position by electronic controls at [he surface. <br />To elimina[e undesired borehole effects, the cool must be <br />urged against the wall of the well bore. In order to deter- <br />mine any standoff between the working face of the tool and the <br />wall, a proximity indicator is incorporated. The double el- CABLE """ <br />bowed arrangement makes it possible for the lower part to <br />remain in contact with the wall in holes up to ten inches in BUMPER ~~ <br />diameter, and in washout zones more than [hree fee[ thick. <br />The tool simultaneously records a proximity index and bulk TRANSMIT <br />density in grams per cubic centimeter. <br />The 3-D Velocity Tool depicted in Fig. > is an acoustic <br />measuring device utilizing transmitting and receiving trans- <br />ducers, The spacing between transmitter and receiver can <br />be from three to 30 feet. The spacing being chosen oh the <br />basis of the type of data that one hopes to measure. The cool INSULATO + <br />is always centralized and must utilize the fluid in the well Lj <br />bore to transmit the signal [o the formation. It is necessary <br />to acoustically isolate the transmitter and receiver. For a <br />more detailed explanation of the 3-D Velocity Log, I wish to <br />refer you to the paper, "The Determina[ion of the In-Situ <br />Elastic Properties of Rock Salt with a 3-Dimensional Velocity <br />Log" presented by D.M. Christensen at this s>•mposium. RECEIVER <br />Some of the outstanding features of the lugs presented <br />in Fig. 5 are as follows: The formation [ops may be easily <br />correlated. There are few shale inclusions in the salt sec- GE0PH0N <br />tion as evidenced by the low gamma radiation. An extremely <br />low hydrogen content exists in the salt sections. This prop- <br />erty is shown by the neucron log. Higher resistivities pre- <br />vail in the salt sections [han in [he limes and shales. The <br />bulk density of the salts are approximately 2.16 grams per Fip+ure 4. ~-D Velocity 1'001, <br /> 59 <br /> <br />