US Ecotrol Report

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TECHNICAL SERVICE REPORTREPORT #: 99-005

TITLE: Fluid Loss Study Comparing ECOTROL with a ConventionalNOVAPLUS System

REPORT FOR: J. Bruton, L. Conn, J Friedheim

AUTHOR: T. Heinz

REPORT NO: 99-005

DATE: May, 25, 1999

SUMMARY M-I Technical Services (North Course) had our laboratory inBogota study the static and dynamic filtration characteristics of a12.0 ppg NOVAPLUS fluid. Once the base line filtration valueswere established for this fluid,2 ppb of ECOTRL was added to thefluid and the tests repeated. The ECOTROL consistentlydemonstrated overall reductions in filtration values in all testsconducted.

Particle Plugging Tests (PPT) gave reductions of 89% on a 20 µ

disk at 500 psi, 200°F and 84% on the 35µ disk with the

remaining parameters remaining equal. At 250°F filtrate

reductions of 86% (20µ) and 51% (35µ) were observed. The last

test matrix was taken at 300°F filtrate reductions of 75% (20µ)

and 69% (35µ) were observed.

Dynamic filtration values where then determined using a FannModel 90. Once again the addition of the ECOTROL consistently

produced lower filtration rates in the NOVAPLUS fluid. At 200°Fthe ECOTROL lowered the filtration rate by 24% on the 20µ tube,

while the 35µ tube had 42% less filtrate than the NOVAPLUS.

When the fluid was tested at 250°F reductions of 72% (20µ) and

5% (35µ) were observed. The 300°F test gave reductions in

filtration rates of 58% (20µ) and 31% (35µ).



Introduction:

In response to concerns addressed within the Petro Physicist group of BP Amococoncerning the leak off rates of the NOVAPLUS system (IO) verses thecompetitions LAO system. This is a direct response to the addressed concerns of

formation evaluation of crude oil while drilling the Crazy Horse prospect locatedin the GOM Mississippi Canyon Block 788 #1. M-I North Course set up a testmatrix evaluating the leak off rates of the NOVAPLUS system and theNOVAPLUS with 2 ppb ECOTROL.

Filtration rates were looked at dynamically with the Fann Model 90, statically withthe Particle Plugging apparatus, and by the HT-HP filtration test. NOVAPLUSfluid formulations are given in table 1.

Table 1

Product 1 2I.O. (16-18), bbl 0.581 0.581

VG-69 PLUS, ppb 6.0 6.0Lime, ppb 3.0 3.0

NOVAMUL, ppb 8.0 8.0

NOVAWET, ppb 2.0 2.0ECOTROL, ppb 0.0 2.0

Water, bbl 0.19 0.19CaCl2, ppb 23.78 23.78

M-I B AR, ppb 234.05 234.05

Fluid Properties

Rheology @ 150°°F Initial Hot Rolled Initial Hot Rolled

600 rpm 63 57 57 65

300 rpm 43 41 36 46200 rpm 36 33 30 35

100 rpm 27 25 20 26

6 rpm 13 12 9 11

3 rpm 12 11 8 10

PV, cps 20 16 21 19YP, lbs/100ft2 23 25 15 27

YS lbs/100ft2 11 10 7 9

10 sec. gel 12 10 9 1010 min. gel 13 13 10 12

Electrical Stability, volts 1250 1375 1037 1711



HT-HP Filtration:

The HT-HP values for the conventional NOVAPLUS are within M-I LLC

specifications. The addition of 2 ppb ECOTROL lowered the fluid loss 41% in thehot rolled sample. These tests where run for 30 minutes as per API

specifications. Numeric values are given in table 2

Table 2

1 2

HT-HP Filtration Test Initial Hot Rolled Initial Hot Rolled

Filtrate @ 300°F & 500psi, ml

4.8 3.4 1.0 2.0

Cake 32’nd inch 1.0 1.0 1.0 1.0

PPA Filtration:

Filtration rates on the PPT were collected for a 6 hour period. Chart 1 shows the

fluid loss values as a function of time on the 20µ Disk at 200, 250 & 300°F and500 psi.

Chart 1

PPA Testing 20 micron Disk, 500 psi

0

5

10

15

20

25

30

35

0 60 120 180 240 300 360

Time, Minutes

F i l t r a t i o n , m l

Conventional NOVAPLUS, 200°FConventional NOVAPLUS, 250°F

Conventional NOVAPLUS, 300°F

NOVAPLUS, 2 ppb ECOTROL, 200°F





Graph 2 looks at the filtration values at 200°F in the square root of time, on the20 micron disk. From this graph, determination of the spurt loss values ispossible. To determine the spurt loss, calculate the slope of the line and take theintercept on the y-axis. This determines the spurt. The x value as shown in theequation is the ml per minute^ 0.5 leak-off for the time of the test. The

conventional NOVAPLUS gave a 1.8 spurt loss while the addition of 2 ppbECOTROL dropped the spurt to 0.0 ml. Both the total filtration rate and the leak-off rate in ml / minute are reduced with the ECOTROL.

Graph 2

NOVAPLUS filtration rates as ml / min. ^ 0.5 conventional = 1.82 ppb ECOTROL, NOVAPLUS filtration rate ml / min. ^ 0.5 = 0.03

PPA 20 Micron Disk

y = 0.19x + 1.8

y = 0.03x - 0.003

0

1

2

3

4

5

6

0 2 4 6 8 10 12 14 16 18 20

Sq. Rt. Time, Minutes






Graph three looks at the PPA at 250°F on the 20 µ disk with 500 psi differentialpressure. Spurt loss with the addition of 2 ppb ECOTRO is lowered from 1.5 mlto 0.13 ml.

Graph 3

NOVAPLUS filtration rates as ml / min. ^ 0.5 conventional = .13NOVAPLUS, 2 ppb ECOTROL filtration rate ml / min. ^ 0.5 = 0.04

PPA Spurt Loss and Filtration Rates on 20 Micron Disk, 500 psi

y = 0.27x + 1.5

y = 0.04x + 0.13

0

1

2

3

4

5

6

7

0 2 4 6 8 10 12 14 16 18 20

Sqaure Root Time, Minutes






Graph 4 is the same testing parameters but at 300 °F. The spurt losses observedin this test are lower in the conventional NOVAPLUS but the filtration rate issubstantially less with the addition of ECOTROL.

Graph 4

NOVAPLUS filtration rates as ml / min. ^ 0.5 conventional = 1.7NOVAPLUS, 2 ppb ECOTROL filtration rate ml / min. ^ 0.5 = 0.3

PPA Spurt Loss and Filtratiion Rates on 20 micron disk, 500 psi

y = 0.3x + 2.1

y = 1.7x + 0.4

0

5

10

15

20

25

30

35

40

0 2 4 6 8 10 12 14 16 18 20

Square Root Time, Minutes

F l i t r a t i o n , m l





35 Micron PPT’s

Graph 5 looks at the fluid loss on a 35 µ disk at 300, 250 & 200°F as a function of time. All filtration rates are lower with the addition of 2 ppb ECOTROL. As thesize of the pores increases it may be beneficial to increase the concentration of

the ECOTROL as filtration rates with particulate matter is normally of function of concentration.

Graph 5

PPA 35 Micron Disk, 500 psi

0

2

4

6

8

10

12

14

16

18

20

0 60 120 180 240 300 360

Time, Minutes










Graphs 6,7 and 8 are PPA’s plotted as the square root of time on the 35 µ disk,500 psi differential.

Graph 6 looks at a 35µ disk at 200°F. Both the spurt and the leak off rate arereduced with the addition of the ECOTROL. Note the increase in filtration seen at

the end of the NOVAPLUS run is an artifact of the PPA. Filtrate is gathered in areservoir at the top of the cell and at the end of the test the technician emptiedthe cell thus creating a higher than normal value.

Graph 6

NOVAPLUS spurt loss = 0.7NOVAPLUS, 2 ppb ECOTROL spurt loss = 0.3NOVAPLUS filtration rates as ml / min. ^ 0.5 conventional = 0.15NOVAPLUS, 2 ppb ECOTROL filtration rate ml / min. ^ 0.5 = 0.03


y = 0.15x + 0.7

y = 0.03x + 0.3

0

1

2

3

4

5

6

7

0 2 4 6 8 10 12 14 16 18 20


F i l t r a

t i o n , m l





Graph 7 looks at the filtration values on a 35µ disk at 250°F. Spurt loss on boththe fluids is identical with the ECOTROL sample demonstrating a substantiallylower filtration rate. Note the increase in filtration seen at the end of theECOTROL run is an artifact of the PPA. Filtrate is gathered in a reservoir at thetop of the cell and at the end of the test the technician emptied the cell thuscreating a higher than normal value.

Graph 7

NOVAPLUS spurt loss = 0.45

NOVAPLUS, 2 ppb ECOTROL spurt loss = 0.31NOVAPLUS filtration rates as ml / min. ^ 0.5 conventional = 0.45NOVAPLUS, 2 ppb ECOTROL filtration rate ml / min. ^ 0.5 = 0.063



In graph 8 the spurt loss of the conventional NOVAPLUS is lower than theNOVAPLUS with ECOTROL, but the overall filtration rate is 76% lower in thesample with ECOTROL.

Graph 8


y = 0.06x + 0.45

y = 0.31x + 0.45

0

1

2

3

4

5

6

7

8

0 2 4 6 8 10 12 14 16 18 20







NOVAPLUS spurt loss = 0.6NOVAPLUS, 2 ppb ECOTROL spurt loss = 0.1.75

NOVAPLUS filtration rates as ml / min. ^ 0.5 conventional = 0.72NOVAPLUS, 2 ppb ECOTROL filtration rate ml / min. ^ 0.5 = 0.14

All PPT’s show the benefit of adding 2 ppb ECTROL to a NOVAPLUS fluid. Longterm static fluid loss testing demonstrates the over all decrease in fluid loss withthe addition of the ECOTROL.

Model 90 Dynamic Filtration

Dynamic filtration rates are different from static filtration tests often resulting inhigher filtration rates. With dynamic conditions filtration rates do not decreasewith time, as with static testing, but instead reach a steady, constant rate. Due to


y = 0.72x + 0.6

y = 0.14x + 1.7537

0

2

4

6

8

10

12

14

16

18

20

0 2 4 6 8 10 12 14 16 18 20







the constant rate dynamic filtration is always plotted as a function of time. Graph

10 shows the filtration rates on a 20µ disk, 500 psi differential at temperatures of

200, 250 & 300°F

Graph 10

In the above graph both the 200°F and the 250°F test demonstrate the ability of ECTROL to lower the dynamic filtration rates. How ever at 300°F the ECOTROLdoes not seem to perform with relation to time. Initially the fluid loss is lower butafter 2.5 hours the filtration rate reaches that of the conventional NOVAPLUS asseen by the slope of the line.

Graph 11 looks at the dynamic filtration rate on a 35µ disk, 500 psi differential at

temperatures of 200, 250 & 300°F.

Model 90 Dynamic Filtration on 20 Micron Disk

0.0

10.0

20.0

30.0

40.0

50.0

60.0

70.0

80.0

90.0

100.0

0 60 120 180 240 300 360

Time, minutes


NOVAPLUS 2 ppb ECOTROL 300 F NOVAPLUS 2 ppb ECOTROL 250 F NOVAPLUS 2 ppb ECOTROL 200 F

NOVAPLUS 300 F NOVAPLUS 250 F NOVAPLUS 200 F



Graph 11

As with the 20µ tube, the performance of the ECOTROL on the 35µ tube is good

at both 200°F and at 250°F. Filtration rates at 300°F however once again fail.This may be due to various factors such as the particles of ECOTROL may bemore susceptible to particle erosion at the higher temperature. Another possibilityis the ECOTROL may be thermally breaking down some where between 250 and

300°F. although it should be noted that this is not seen in the PPT’s.

Graph 12 is the Model 90 20µ tube at 200°F. Overall filtration values are reducedwith the addition of ECOTRL to the base NOVAPLUS fluid

Model 90 Dynamic Filtration on 35 Micron Disk

0.0

10.0

20.0

30.0

40.0

50.0

60.0

70.0

80.0

90.0

100.0

0 60 120 180 240 300 360

Time, minutes

F i l t r a t i o n

, m l

NOVAPLUS 2 ppb ECOTROL 300 F NOVAPLUS 2 ppb ECOTROL 250 F NOVAPLUS 2 ppb ECOTROL 200 F

NOVAPLUS 300 F NOVAPLUS 250 F NOVAPLUS 200 F



Graph 12

Model 90, 20 micron Tube 200 F

0.0

2.0

4.0

6.0

8.0

10.0

12.0

14.0

16.0

18.0

20.0

0 50 100 150 200 250 300 350 400

Time, Minutes

F i l t r a t e , m l

NOVAPLUS

NOVAPLUS, 2 ppb ECOTROL



Graph 13 is looks at the Model 90 on a 20µ disk at 250°F. Filtration rates aresignificantly better with the ECOTROL than without.

Graph 13

Model 90, 20 Micron tube, 250 F

0.0

10.0

20.0

30.0

40.0

50.0

60.0

70.0

0 50 100 150 200 250 300 350 400 450Time, Minutes


NOVAPLUS




Graph 14 is at 300°F on a 20µ tube. The slope of the line indicates that filtrationvalues are almost identical when time is removed from the equation. This may bea factor of base oil viscosity reduction or a break down of the organophilic claysused in these systems.

Graph 14

Model 90, 20 Micron Tube, 300 F

0.0

10.0

20.0

30.0

40.0

50.0

60.0

70.0

80.0

90.0

100.0

0 50 100 150 200 250 300 350

Time, Minutes


NOVAPLUS




Graph 15 shows a lower filtration value at 200°F on a 35µ disk.

Graph 15


0.0

5.0

10.0

15.0

20.0

25.0

0 50 100 150 200 250 300 350 400

Time, Minutes

F i l t r

a t e , m l

NOVAPLUS




Graph 16 is at 250°F on the 35µ disk. A noticable lowering of the filtration rateoccurs with the addition of the ECOTROL.

Graph 16

Model 90, 35 Micron Tube 250 F

0.0

10.0

20.0

30.0

40.0

50.0

60.0

70.0

0 50 100 150 200 250 300 350 400

Time, Minutes


NOVAPLUS




Graph 17 is the model 90 at 300°F on a 35 µ tube. Again, there is a deteriorationof the filtration value at this temperature. This effect can only be related to thedynamic processes as it is not observed on the PPA.

Graph 17

Conclusion:

The addition of 2 ppb ECOTROL to a synthetic fluid lowers all fluid loss values in

the test matrix with the exception of the 300°F Model 90. This product not onlylowers filtration values but decreases spurt loss in most instances. When lower fluid loss values are required, the addition of ECOTROL to an invert emulsionshould give the desired results.


0.0

10.0

20.0

30.0

40.0

50.0

60.0

70.0

80.0

90.0

100.0

0 50 100 150 200 250 300 350

Time, M inutes

F i l t r a t e ,

m l

NOVAPLUS


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