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Test Procedure Potassium Ion Concentration

This document provides instructions for testing the potassium ion concentration in drilling mud using a hand cranking centrifuge. The test involves adding sodium perchlorate to a mud sample, centrifuging to form a precipitate, and measuring the volume of precipitate to determine the potassium ion concentration based on a provided table. Key equipment includes a hand cranking centrifuge and graduated centrifuge tubes. Monitoring potassium ion concentration is important when using potassium chloride mud to prevent hydration of water sensitive formations.

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54 views1 page

Test Procedure Potassium Ion Concentration

This document provides instructions for testing the potassium ion concentration in drilling mud using a hand cranking centrifuge. The test involves adding sodium perchlorate to a mud sample, centrifuging to form a precipitate, and measuring the volume of precipitate to determine the potassium ion concentration based on a provided table. Key equipment includes a hand cranking centrifuge and graduated centrifuge tubes. Monitoring potassium ion concentration is important when using potassium chloride mud to prevent hydration of water sensitive formations.

Uploaded by

jalal
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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TESTING EQUIPMENT

POTASSIUM ION CONCENTRATION


When a drilling mud containing potassium chloride (KCl) is used, the primary purpose is to prevent, or at least minimize hydra-
tion of water sensitive formations. Inhibition of hydration is provided by the potassium ion, K+, which is attracted to negative
charges appearing through the flat surface. Therefore, it is extremely important to know the potassium ion concentration at all
times in these mud systems. In fact, by monitoring the potassium to chloride ion ratio (K+ /Cl- ) while drilling the more hydrat-
able formations should coincide with points having a low ratio.

Equipment Product Code


1. Hand cranking centrifuge E83087
2. 2 graduated centrifuge tubes E83089
3. 750 gm/L sodium perchlorate precipitating solution EY1190

TEST PROCEDURE POTASSIUM ION CONCENTRATION


1. In order to balance the centrifuge, measure 14 mL of Floc Volume (mL) Potassium Ion Concentration
fresh water in the other centrifuge tube and place it (mg/L)
into the centrifuge.
0 0
2. Add 4.0 mL sodium perchlorate to 10.0 mL of filtrate to 0.25 5000
be tested in the centrifuge tube. A white precipitate, 0.50 7500
which forms immediately, indicates the presence of
potassium. 0.80 10000
1.10 15000
3. Invert slowly for one minute and place in the centrifuge.
1.30 19000
4. Centrifuge for one minute at a cranking speed of 120 1.50 24500
revolutions per minute, (10 revolutions every 5 sec-
1.70 31000
onds).
1.90 38000
5. Remove the centrifuge tube and note the amount of 2.10 45000
centrifuged precipitate as the FLOC VOLUME in millili-
2.30 53000
ters. Do not discard the centrifuged filtrate at this point.
2.50 59000
6. Determine the potassium ion concentration from the
2.70 65000
table below:
2.90 70000
Note: For potassium ion concentrations above 55,000 3.10 75500
mg/L, save the centrifuge filtrate, clean the tubes, split the
centrifuged filtrate evenly into each tube, add 4 mL sodium 3.30 81000
perchlorate to each tube and centrifuge again. Record the
total floc volume as the sum of the original floc volume plus 5250 mg/L K+ is approximately 10 kg/m3 KCl
any additional floc volume obtained by double centrifuging.

1.800.661.2792 | www.di-corp.com | info@di-corp.com


Di-Corp is a registered trade name of Diversity Technologies Corp.

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