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PLAINTIFF'S EXHIBIT
INTERNAL. CORRESPONDENCE
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Mr. P. J. Colpoys (4) UCC-Linde Division Oil Well Products Department 3737 Greenway Plaza Drive
P.O.Box 22127 Houston, Texas 77027
Messrs. D. J. Hansen
W. N. Johnson R. J. Klotzbach J. L. Myers ----
J. IV. Rawlings J. E. Skvarla (6)
L. P. Twichell
R. G. Woolery
R D `File
Do,
Originating 0pt Antwflng
*&**
August 10, 1972
F^s^orrh and Development Deportment
Magnetite-Asbestos Well Fluid Weighting Agents, Laboratory Evaluation of Performance and Constituent Analysis
Dear Mr. Colpoys:
The program has been completed for evaluating various combinations of magnetite and asbestos as weighting agents for well fluids. The program objectives were to determine the optimum magnetite-asbestos ratios to maximize the fluid weight and the acid solubility of the weighting agent and to minimize the fluid viscosity and the settled density of the weighting agent.
Magnetite was mixed with asbestos at 1, 2, 3, and 5 wt. % of the mix. Following is a summary of the results.
1. A weighting agent compounded from 99 wt. % King City tailings magnetite and 1 wt. % High Purity Opened asbestos appears to be optimum for very high-density fluids. This composition has acceptable rheological properties in fluids weighted to 15 to 18 pounds per gallon (dilute suspensions settle to a slurry density of 15 pounds per gallon).
2. Asbestos at 2 and 3 wt. % provides a weighting agent suitable for well fluid weights ranging from 13.5 to 16 pounds per gallon.
3. At 5% asbestos the maximum fluid weight is limited to 14 pounds per gallon and to 13 pounds per gallon minimum weight.
4. Fluids lighter than 13 pounds per gallon will require more than 5 wt. % asbestos to suspend the magnetite and limit the settled solids density.
The performance evaluation data, the compounded weighting agent speci fications, and the constituent characteristics are listed in seven tables;
Mr. P. J. Colpoys
-2- August 10, 1972
I. Rheological properties of fluids weighted to 12, 14, 16, and 18 pounds per gallon with weighting agents containing 1, 2, 3, and 5 wt. % asbestos.
II. Settling rates and final settled solids volumes of the four weighting agent compositions.
III. Chemical and physical characteristics of the four weighting agent compositions.
IV., V. Chemical and physical characteristics of the magnetite. VI.
VII. Typical product characteristics for High Purity asbestos.
Precautions should be taken to ensure that asbestos-magnetite weighted fluids are kept free of anionic surfactants which will disperse the asbestos and allow the magnetite to settle. If this will not be possible in the field, the use of RG-244 or RG-444 grades of asbestos should be investigated as a substitute for the High Purity grade.
Very truly yours
JESrrvg Attach.
UCC 011007
Mr. P. J. Colpoys
-3-
TABLE I
Rheological Pi'operties of MagnetiteAsbestos-W'eighted Well Fluids
August 10, 1972
1. Instrument - Farm Viscometer, Model 35 (Spring, Rotor, Bobbin - No. 1).*
2. Standard API procedure.
3. Target specs.: AV 100 cps. max., 10 sec.gel <20 lb./lOO ft.2. 10 min. gel < 50.
Well Fluid
Wt.-12 lb./gal. AV (cps.)
Sp.gr. 1.44
PV (cps.)
YP (cps.)
*10 sec.gel(lb./lOO ft.2)
Wt.-14 lb./gal. AV
Sp.gr. 1.68
PV
YP
*10 sec.gel
Wt.-16 lb./gal. AV
Sp.gr. 1.92
PV
YP
*10 sec.gel
Wt.-18 lb./gal. AV
Sp.gr. 2.16
PV
YP
*10 sec.gel
Weighting Agent Compound No.
12
3
7 14
22
7 11
19
07
5
64
2
5 48 42 11
8
21 40 48 63
9 13 24 55 28 8
25 45 17 -
24 78 24
50 23 55 N.D.
86 69 34 ' 34
75 70
24 16
102 108
24 37
-- -r-
------
(700 viscous for analysi
--
*10_second and 10-minute gel strength data are comparable for asbestos systems
UCC 011008
Mr. P. J. Colpoys
-4-
August 10, 1972
TABLE II
Settling Rate and Final Settled Volume of MagnetiteAsbestos Well Fluid Weighting Compounds
Settling Rate
Time (Min.)
0 Settled Vol.(ml) 5 10 15 20 25 30 35 40 45 50 55 60
18 Hours
1
1000 760 640 590 570 560 545 530 520 515
-
500 495
475
Weighting Compounds 23
1000 815 690 655 625 605 595 585 575 570 565 560 555
520
1000 815 725 690 665 650 640 630 625 620 615 610 605
560
5
1000 890 850 805 785 760 740 720 705 -
575
Analvsis of the Settled Solids From the 18-Hour Settling Test
1. Settled vol. (ml)
2. Contained solids (g.)
3. Contained solids (cc.)
4. Contained water (ml)
5. Total wt. in settled solids (g.)
6. Sp.gr. of settled solids volume
7. Lb./gal. wt, of settled solids volume
475 516 111 364
880
1.85
15.4
520 411
89 431
842
1.62
13.5
560 412
90 470
882
1.58
13.2
575 414
92 483
897
1.56
13.0
UCC 011009
Mr. P. J. Colpoys
-5-
August 10, 1972
TABLE III
Chemical and Physical Characteristics of MagnetiteAsbestos Well Fluid Weighting Compounds
Weighting Compound
1 2 3 5
Composition,
Parts/100 by Wt.
Asbestos
Fe^Od
1 99
2 98
3 97
5 95
Constituent Sp.Gr.
Asbestos 2.5-
Fe304
4.7
Compound* Sp. Gravity
Cg./cc.)
4.66
4.62
4.58
4.50
Compound**
Solubilities
(Wt. %)
Acid
Acid Mud
92.4
97.3
92.4
94.6
92.0
95.4
90.0
94.3
**By Gulf Res. procedure, target spec. 50% sol.
UCC 011010
Mr. P. J. Colpoys -6- August 10, 1972
TABLE IV Chemical and Physical Characteristics of the Magnetite
Magnetite Constituent From King City, California asbestos mill tailings. Physically
beneficiated to 4.7 minimum specific gravity. X-ray diffraction pat tern identical to that of magnetite standard.
TABLE V Magnetite Analysis by Emission Spectrograph
Element
A1
Ca Co Cr Cu Fe Mg Mn Mo Ni Si Ti V
% Contained
0.08 - 0.8 0.008 - 0.08 0.02 - 0.2 0.1 1.0 0.002 - 0.02
Major 0.8 8.0 0.02 . - 0.2 0.008 - 0.08 0.1 1.0 0.1 1.0 0.008 - 0.08 0.002 - 0.02
UCC011011
Mr. P. J. Colpoys
-7- August 10, 1972
TABLE VI
Magnetite Particle Size Distribution by Sharpies Micromerograph
Diameter (Microns)
50 30 20 10
9 8 7 6 5
>
4 3 2 1 0.5
Wt. % Finer 100 70 41 29 28 26 22 17 15 14 10 4 1 0
UCC 011012
Mr. P. J. Colpoys
-8-
August 10, 1972
TABLE VII
Typical Product Characteristics for _______ High-Purity Pellets (HPP)
Property
Moisture Content, % Magnetite, % +65 Mesh, Wet Screen % (after repulping)
PH Specific Gravity
) Surface Area of Fibrous Product, m2/gm
Refractive Index, n^25C
Reflectance, GE Brightness, %
Nature of Surface Charge
Bulking Value, gal./lOO lb. Aspect Ratio of Fibers (Average L/D) Shipping Density, lb./ft.^
Typical Value 2.0 0.6 1.0 9-5 2.45 60 1.54-1.56 74
Electropositive (Cationic) 4.8 200/1 40
UCC 011013
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