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WATER MANAGEMENT TECHNOLOGY FOR OIL PRODUCTION

4 OIL PLUSWATER MANAGEMENT TECHNOLOGY FOR OIL PRODUCTION

TROLL FIELD WELL 31/3-1.toring Quality of CompletionvLuids for Production Tests

Wessex House, Oxford Road, Newbury,Berks RG131 PA, England.Telephone: Newbury (0635) 30226 Telex: 849181

CN 6581 A

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• WELL 31/3-1

TROLL FIELD

Completion Fluids for Production Testsin the Gas Zone

I Results of Monitoring the Quality of

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IReport Prepared by

• Oil Plus Limited

For Statoil

November 1983

CONTENTS

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LIST OP CONTENTS

SECTION 1. INTRODUCTION

SECTION 2. CONCLUSIONS AND RECOMMENDATIONS

SECTION 3. ANALYTICAL TECHNIQUES

3.1. Seawater and Calcium Chloride Brine Quality Monitoring

3.1.1. Particle Size Analysis3.1.2. Turbidity3.1.3. Millipore Filter Tests

SECTION 4. RESULTS AND DISCUSSIONS

4.1. Introduction

4.2. Production Test Zone 1519m to 1529m BRTInternal Gravel Pack Completion

4.2.1. Clean Up Procedure4.2.2. Seawater and Brine Quality During Clean Up Procedure4.2.3. Brine pH and Stability of Solids Level

4.3. Production Test Zone 1373m to 1383m BRTInternal Gravel Pack Completion

4.4. Filter Performance

4.5. Brine Quality as Received on Board the Rig fromthe Supply Boats

FIGURES

TABLES

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INTRODUCTION

SECTION 1.

INTRODUCTION

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INTRODUCTION

SECTION 1. INTRODUCTION

This report presents the results of monitoring the qualityof seawater and calcium chloride brine circulated in Well 31/3-1in the Troll Field, in preparation for the production tests in thegas zone.

The two main production tests involved internal gravel packcompletions. The first test was in the 1519m to 1529m zone,second test was in the 1373m to 1383m zone.

The

The cleanliness of all fluids pumped downhole, and that of thereturns, was carefully monitored. The cleanliness of the fluidsand rate of clean up have a direct effect, not only on the skinfactor of the producing zone, but also the entrained fines withinthe gravel when placed, and the subsequent near well bore permeability.

The completion fluid monitoring tests were performed by Oil Plus onrig Deep Sea Bergen between 8th September and 29th September 1983.


CONCLUSIONS ANDRECOMMENDATIONS

SECTION 2.

CONCLUSIONS AND RECOMMENDATIONS

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SECTION 2. CONCLUSIONS AND RECOMMENDATIONS

1. The results of brine quality monitoring indicated that the proceduresused had been successful in achieving a high standard of cleanlinessof the brine, casing and gravel pack strirg prior to perforationsfor the two tests in the 1519m to 1529m, and 1373m to 1383m BRT Zones.

Higher degrees of cleanliness than for previous completions inTroll Field were attained, and provided a standard which subsequentcompletions should strive to achieve.

2. Turbidity values of Just greater than 1 NTU (NepheloinstricTurbidity Unit) were recorded for the calcium chloride brinein the hole prior to each perforation job, as compared to abest of 3.8 NTU for previous completions in the Troll Field.

Coulter Counter readings were:-

400 - 500 particles of diameter greater than or equal to 3microns per 0.05 ml.

and less than

100 particles of diameter greater than or equal to 5 micronsper 0.05 ml.

Subsequent completions should strive for brine returns of thisquality, as this corresponds closely to the average quality ofthe brine at the outlet to the filter system.

3. Procedures of well clean up operations often state that brinecirculation should continue until the solids level of the returnshad reached a minimum. It is unlikely that an irreducible solidsconcentration would be reached because once the casing, and gravelpack string have been cleaned the filter system will still continueto remove a certain percentage of particles on each pass throughthe filters.

If it proves impractical to achieve the target quality as specifiedabove, we recommend that brine circulation should be continueduntil the 'clean up rate1, or reduction in particle counts (ofparticles of diameter greater than or equal to size which willcritically block the formation, in this case considered to be 3microns) in the returns reduces by less than 5% in the tine ofone circulation.

4. To be able to achieve a similar brine cleanliness for subsequentcompletions, as was attained for this completion, it will be importantto repeat the following steps:-

i). Thoroughly clean the casing and gravel pack string before RIH.Use minimum pipe dope whilst malting up the string.

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Section 2. Continued. . . .

11). Thoroughly flush and circulate seawater through the mudsystem, all lines to be used during the gravel pack,and the choke and kill lines, before circulating brine.The quality of the fluids flushing these lines should becarefully monitored to measure the efficiency of the cleanup. It is Important to recognise that seawater from therig seawater main is a very clean fluid, even in comparisonto the filtered brine, and should be used to the maximumbenefit to clean up the topsides equipment and the wellprior to brine circulation.

ill). Transport the brine to the rig in lined tanks on the deckof the supply boats to ensure that the brine can be filteredby the fine filters. After transportation to and filtrationon the rig, brine of turbidity of less than 3 NTU should beachieved. If not investigations into the cleanliness ofthe brine producing and transporting system should bemade. Brine of this quality is vital to the swift andsuccessful clean up operation.

iv). Ensure lines used to transfer the brine from the supplyboat to the rig are clean, and are not contaminated withdiesel oil or other contaminants.

v) . Always use the complete filter system, Including the finefilters when filtering the brine.

vi). Thoroughly hose down the parts of the mud system to beused for the brine circulation, and circulate seawaterthrough it so that the solids pick up in the system can bemonitored prior to the introduction of the brine.

As a further assurance of brine cleanliness, thought shouldbe given to the feasibility of bypassing the mud systemaltogether when circulating the seawater and brine.

vii). Use a standby syston when changing filters, and ensurethat enough filters are on-line to cope with the prevailingflow rate. Failure to do so will result in a deterioration ofbrine quality.

viii). Use a water soluble oil to lubricate the pistons of theDowell high pressure pump unit. This prevents insolubleoil particles picked up fron the pump adding to thesuspended particle counts level of the brine. Watersoluble oil should also be used for the pump which transfersthe brine from the supply boat to the rig.

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Section 2. Continued ...

ix) Fittings should be available to provide sample points in thechicksan downstream of the Dowell high pressure pump duringthe brine circulation.

A sample point should also be available at the drill floorduring seawater circulation, downstream of the mud pumpsand the mud lines to the drill floor to distinguish betweensolids picked up in the mud system, and those picked up inthe well.

x). The pH of the calcium chloride should be kept below 10 toprevent any magnesium present precipitating whichwould increase the solids level of the brine.

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! SECTION 3.


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SECTION 3. ANALYTICAL TECHNIQUES

This section describes the techniques used to analyse the completionfluids, in terms of particle size distribution, turbidity and theweight of suspended solids.

3.1 Seawater and Calcium Chloride Brine Quality Monitoring

3.1.1. Particle Size Analysis

The particle size analysis of the seawater and calciumchloride brine samples were conducted using a Model DIndustrial Coulter Counter, counting particles ofdiameter betveen 1.0 to 15.0 microns.

This equipment measures the volume of a particle, andthe particle size is expressed as the diameter of asphere having an equal volume.

3.1.2. Turbidity

Turbidity was measured using a Hach 2100A turbiditymeter. This instrument measures the amount of lightscattered, at 90° to the incident light, by thesuspended particles. The results are given inNephelcmetric Turbidity Units (N.T.U.).

The readings are dependent on the particle sizedistribution and particle shape, as well as thesuspended solids concentration. Thus, two watershaving the same turbidity may well be quite differentin terms of particle size and their distribution.

Nevertheless, the readings provide a useful check formonitoring variations in water or brine quality.

3.1.3. Millipore Filter Tests

All Millipore tests were run using pre-welghedMillipore membrane filters of 47 mm diameter and 0.45micron pore size, these tests were nan in accordancewith the National Association of Corrosion EngineersStandard TM-01-73. "Methods for determining waterquality for sub-surface injection using membranefilters".

The method used by Oil Plus involved taking a 10litre sample of water into a pressure cell which wasthen pressurised and held at 20 psig; water flowedfrom this cell through the Millipore filter, dischargingto atmosphere.

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3.1.3. Millipore Filter Tests (Contd) ...

Simultaneously, 'Slope' tests were conducted bytreasuring the volume passing through a Milliporemembrane with time. The rate of change of the flowrategives an indication of the water quality. The dirtierthe water the more rapid the decline in flow rate.

After conducting these tests the Milllpores wereflushed through using 0.45 micron filtered, de-ionisedwater to remove all traces of salt water which wouldotherwise crystallise on the membrane and give falseresults. After drying, the Millipore membranes wereweighed and suspended solids calculated.

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RESULTS ANDDISCUSSIONS

SECTION H.

RESULTS AND DISCUSSIONS

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SECTION 4. RESULTS AND DISCUSSIONS

H.I. Introduction

This section presents and discusses the results of completionfluid monitoring performed by Oil Plus during the productiontest programnres in the gas zone of Well 31/3-1, of the TrollField.

The section is divdided into four parts.

Firstly the well clean up operation for the production testsIn the 1519m to 1529m zone.

Secondly the well clean up operation for the production testsin the 1373m to 1383m zone.

Thirdly filter performance and finally brine quality onarrival on the rig Deep Sea Bergen.

4.2. Production Zone 1519m to 1529m BRT. Internal GravelPack Completion

4.2.1. Clean Up Procedure

Following RIH with a 91" casing scraper, and with the 85" biton bottom a 50 bbl spacer was pumped followed by seawater todisplace the drilling mud from the well.

The seawater circulation system is illustrated in Figure 4.1.

After the well had been displaced to seawater a 20 bbl pillof viscosified seawater containing a surfactant and sand waspumped. (The object of circulating this pill containingsand was to score off and clean up any corrosionproducts still adhering to the inside of the casing).

This pill was followed by a similar pill, butwithout the sand. These pills were circulated out withseawater. Another viscous pill was introduced after anotherhalf hole volume had been pumped. These pills were circulatedcut with seawater and discarded.

This treatment was followed by 2000 gallons of 1\% HCL acidcontaining a corrosion inhibitor.

The seawater was then circulated as fast as possible, withthe returns being dumped. Circulation was continued untilthe solids level had reached a practical minimum, asmeasured by the Coulter Counter. Ideally, thiswould have been when the solids level going into thewell was the same as the returns from the well.

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4.2.1. Clean Up Procedure

Once the solids level of the seawater returned hadreached a practicle minimum the drill string waspulled. It was replaced by the string to be usedduring the gravel pack operation, so that it wouldbe cleaned during subsequent seawater and brinecirculations.

With the gravel pack string RIH, seawater circulationwas recommenced and was again continued until thesolids level of the seawater returns reached a minimum.During this time the choke and kill lines, and theparts of the mud system which were to be used duringthe brine circulation were flushed with the cleanseawater returns. Prior to this the relevant partsof the mud system had been thoroughly hosed down toremove all traces of mud.

When the mud system had been flushed with seawaterthe seawater was circulated out of the well with 20bbls of viscosified seawater, followed by filtered1.16 SG calcium chloride brine.

The calcium chloride brine was then circulated andfiltered using the system Illustrated in Figure 4.2.The brine circulation continued until the solidsconcentration in the brine had levelled off at thelowest practical level as measured by the Coulter(particle) Counter and the turbidity meter.

The perforating was then performed followed by a shortflow test and PBU prior to the setting of the internalgravel pack.

Three attempts at setting the gravel pack were requiredbefore a successful pack was completed. This wasdue to formation sand blocking the screens.

4.2.2. Seawater and Brine Quality During Clean Up Procedure

The results of the turbidity and particle count measurementsfor the circulation of seawater and 1.16 SG calcium chloridebrine are illustrated in Figures 4.3 and 4.4 respectively.The results are presented in Tables 4.1 to 4.7.

The results of the membrane filter slope tests, prior toperforation, are illustrated in Figure 4.5 as 'Barkman andDavidson Plots'. The steeper the gradient of the plot, thebetter the water quality. In essence the plots for the worstwater qualities plot closest to the X-axis. The volume ofsample which passed through the membrane filter in 30 minutesduring the seawater circulationn is plotted in Figure 4.6.Suspended solids concentrations, in milligrammes per litreare presented in Table 4.7.

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4.2.2. Contd

With the drill string RIH, approximately five completecirculations were required to reduce the turbidityof the seawater returns fron 80 NTU to a steadyminimum level of approximately 10 NTU (following theviscous sand and acid pill treatments).

Vhen the string to be used for the gravel pack installationhad been RIH, and the seawater circulation restarted theturbidity of the seawater returns fell from a maximumof 310 NTU, finally levelling off at approximately12.5 NTU after just over one circulation. Thisrapid rate of clean up is a direct result of thoroughcleaning of the gravel pack string including Tubularsand casing prior to RIH. This practice avoids unnecessarycontamination of the seawater and saves rig time byreducing the number of circulations required duringthe clean-up.

A sample taken fron the rig seawater main (the input tothe seawater circulation system) had an averageturbidity of just 0.25 NTU, much less than the minimumfor seawater returns. Oil Plus1 experience of monitoringwater injection tests using mud pumps has shown thatsignificant levels of solids can be picked up fromthe mud pump and the mud lines to the drill flooreven after extended periods of time. This resultsfron the vibration, induced during pumping, looseningmud from pump and mud line surfaces. The affect isincreased where unllned pipes, or pipes with damagedlinings are used as the initial amounts of mud adheringare greater. Prior to a clean up operation involvingseawater circulation a sample point should be providedon the drill floor, at the inlet to the well. Thiswould enable distinctions to be made between solidspicked up in the well and contamination due to themud pump and mud lines. If the solids pick up in thewell was found to cease before that in the mud system,circulation time could be reduced and rig time saved.

An indication that a lot of the solids picked up by thebrine originated from the mud pumps and mud lines tothe drill floor was given by the subsequent circulationof filtered brine. The problem with the mud linesto the drill floor is that they are inaccessible andare not cleaned in any way, apart from the flushingwith seawater.

In the case of the brine circulation prior to perforationthe turbidity of the brine returns fell from a maximumof 8.0 NTU, to a minimum of just 1.1 NTU, in thecourse of just over three circulations.

The final turbidity of the brine returns represented animprovement on the final turbidity of the seawater returns.This may be attributed to the brine not picking up solids

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4.2.2. Contd ....

from the mud lines to the drill floor. The average turbidityof the brine at the well inlet was 1.4 NTU compared to anaverage for the rig seawater main of 0.25 NTU.

During brine circulation prior to perforation the brineturbidity at the well inlet (downstream of the Dowell pump) •fell from 2.9 NTU to 0.37 NTU. Figure 4.8 compares theturbidity at the well inlet and outlet. Figure 4.9 illustratesthe results of the membrane filter slope tests during thebrine circulation, whilst Figure 4.10 plots the volume passedthrough the membrane filter in 30 minutes. All resultsshow the gradual improvement in the quality of the brinereturns.

The final turbidity of the brine returns represents animprovement in brine quality in comparison to previouscompletions In the Troll field. This may be attributed toa successful cleaning of the mud system prior to brinecirculation, and of the tubulars prior to RIH, and also dueto the use of a water soluble oil to lubricate the pistonsof the Dowell high pressure pump unit. The use of a watersoluble oil, precludes insoluble oil droplets being pickedup in the pump and increasing turbidity.

The results of monitoring turbidity and particle sizedistribution of brine returns during circulationsassociated with the three gravel pack attempts areIllustrated In Figures 4.11 to 4.14 inclusive. Theresults of the membrane filter slope tests prior tothe first gravel pack attempt are shown in Figure4.15. Volumes passed through the membrane filter In30 minutes are illustrated in Figure 4.10, whilst thesuspended solids concentrations are plotted in Figure 4.7.

At all times the turbidity of the final brine returns wascomparable to the best obtained during previous completionsin the Troll field, i.e., less than 5 NTU.

A slight rise in the turbidity of the final brine returnsafter perforation was due to contamination by sized calciumcarbonate particles from the lost circulation pills. Tosimulate the effect of acid treatment on the turbidity andparticle counts of the brine, 15% HCL was added to the brinesamples. The changes in turbidity and particle counts due tothe addition of 15% HCL, a third of the volume of the sample,are presented in tables 4.8 and 4.9 respectively.On average a 572 reduction in turbidity was achievedthrough acidifying the sa-nple.

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4.2.3. Brine pH and Stability of Solids Level

No pH greater than 10 was recorded for the brine, indicatingthat the brine was kept below the pH at which any magnesiumpresent would precipitate. The stability of the brine's solidslevel, at surface conditions, for the period of one circulation,was checked. The results are presented in Table 4.10. Nosignificant change in the solids level was found confirming thestability of the brine.

4.3. Production Test Zone 1373m to 1383m BRT.Pack

Internal Gravel

Following the production test in the 1519m to 1529m zone acement plug was set to block off that layer prior to theproduction test in the 1373m to 1383m zone.

Tne 1.16 SG brine used for the previous completion was replacedby 1.30 SG brine.

The 1.30 SG brine was circulated and filtered until anacceptable solids level for the brine returns had been obtained.

The casing was then perforated between 1373m and 1383m BRT,after which there was a short flow test followed by a pressurebuild up test.

Subsequent circulation followed, before the setting of thegravel pack.

The results of monitoring the turbidity and particle sizedistribution of the brine returns are illustrated in Figures4.16 to 4.17 respectively. The results are presented inTable 4.11.

As for the 1519m to 1529m zone, between three and four completecirculations of brine were required before the turbidity ofthe brine returns fell to just over 1 NTU.

4.4. Filtration System and Filter Performance

The brine filtration system is illustrated in Figure 4.2.4 pods, each housing 18, 5 micron nominal Hytrex cartridgefilters, arranged in parallel, act as the pre filter to 4 pods,also arranged in parallel, each containing 32, 10 micronabsolute Pall cartridge filters. This is the filtrationsystem, suggested by Oil Plus, for previous completions inthe Troll field.

Each pod containing the Hytrex filters can take a maximumflow of 5 bpm without adversely affecting filter performance.For the Pall filters the maximum recommended flow rate is 2bpm. per pod. As the maximum flow rate for the brine wasapproximately 6 bpm, 2 pods of Hytrex filters and 3 pods of

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4.4. Contd ...

Pall filters should be online. The other pods should befilled and on standby ready for when the differential pressurereaches that requiring a change of filters. The maximumallowable differential pressures for the Hytrex and Pallfilters is 20 psi and 40 psi respectively.

The increase in differential pressure across the filtersrepresents a build up of filter cake on the filter surfacewhich improves filter efficiency. The 5 micron nominal Hytrexfilters are coarse enough to let sufficient particles to passfor a filter cake to build up on the Pall filters, yet stillfine enough to enable a reasonable filter life for the Pallfilters. The filter system is a compromise between filterefficiency and a reasonable filter life.

Filter change overs are an important aspect of filtration.The system of standby filters mentioned above should beadopted. This enables a quicker filter change to be madeand also guards against the need to bypass a filter stageduring filter change out.

If the coarse filtration has to be bypassed during filterchanges the life of the fine filters will be dramaticallyreduced. If the fine filtration stage has to be bypassedduring filter changes, brine of substandard quality willenter the well, lengthening the time required to reach thedesired brine quality at the well outlet. Thus, efficientfilter changes, adopting a standby system will lengthen filterlife and save rig time during the brine circulation system.

A standby system in which only one new pod of filters isintroduced at one time will also help to maintain filterefficiency, again saving rig time. As mentioned above, as afilter cake builds up on filters and the differential pressureincreases, filter efficiency will also increase. If all ofthe filter pods are changed at once the benefit to filtrationdue to filter cake build up will all be lost and has to beregained gradually as the filter cakes redevelop. Changingonly one pod at a time will be less detrimental to filterefficiency.

The average filtration efficiency for the 5 micron nominalHytrex filters on their own was 46 .4% for particles of diametergreater or equal to 3 microns and 55-2% for particles ofdiameter greater or equal to 5 microns. In comparison theefficiency with the Pall filters as the fine filtration stagewas 89.1% and 92.8% respectively at the particle sizesmentioned above.

The average filter efficiency, as indicated by turbidity, forthe Hytrex filters on their own, and the complete filtrationsystem was 34.2% and 87.2% respectively.

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RESULTS AND

4.4. Contd ....

This illustrates the better filtration provided by absolutecartridge filters as opposed to nominally rated filters.Also apparent is the obvious benefit of using the completefiltration system, including the Pall filters, and not Justthe Hytrex filters, for example when transferring brine fromthe supply boats to the Dowell Storage tanks on the rig.

Thought should be given to the feasibility of re-using themore expensive Pall filters by washing the surfaces of thefilters after use, with a high pressure hose. This may betirre consuming, yet sone increase in filter life will beachieved. Also, the filter cake left will produce a highInitial filter efficiency when first put back on-line.

4.5. Brine Quality as Received on Board the Rig from the Supply Boat

Great effort was made to present the brine at the rig in asclean a condition as possible. Providing clean brine to therig reduces the circulation required to reach the desiredbrine quality and also saves on the number of filters usedon the rig.

To this end the brine was filtered twice onshore by 5 micronnominal Hytrex cartridge filters, and transported to the rigin lined storage tanks on the deck of the supply boat.

During SOITE previous completions in the Troll field the brinehad to be transported to the rig in the supply boats' owntanks often resulting in contamination of the brine whichnegated the effects of onshore filtering. This meant that thebrine could only be filtered by the coarse filters duringtransfer to the rig, and on those occasions, brine of substandardquality was placed in the rig storage tanks.

The results of monitoring the quality of the brine as it wastransferred onto the rig from the supply boat are presented inTable 4.21. The average turbidity of the brine from the storagetanks on the supply boat was 20.9 NTU. The brine was ofsufficient quality that it could always be filtered by thecomplete filter system incorporating the fine Pall filters.

The results of monitoring the brine quality in the rigstorage tanks after filtration and transferring it fromthe supply boat are presented in Table 4.22. The averageturbidity of the brine in the storage tanks was 1.7 NTU.

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RESULTS AND DISCUSSIONS

4.5. Continued....

The Importance of obtaining clean brine in the Dowell rigstorage tanks prior to the displacement of the well to brinecannot be over emphasised. It should be possible to havebrine in the storage tanks, with a turbidity of 3 NTU orless using the present filtration and transportation system.Investigation into the cleanliness of the equipment usedshould be made if brine of this quality is not obtained.

The quality of the brine used to perform the Initial displacementof the well will greatly effect the time required to reachthe target brine quality. As shown in Figure 4.2. the brineis not filtered on passing from the Dowell residence/storagetank to the Dowell pump (the brine is filtered before itenters the Dowell tank). Thus the quality of the brine whenit reaches the rig is all important in saving rig time whilstperforming the clean up operation.

If seawater circulations performed prior to the brinecirculation have been successful, and the mud system has beenthoroughly cleaned, theoretically the brine should pick up arelatively low level of solids on being circulated throughthe well. &

Providing the brine is clean at the well inlet the circulationand filtration will soon result in acceptable brine qualities.The importance of inlet brine quality, thorough cleaning ofthe system and successful seawater circulations are allcrucial in achieving satisfactory completion fluid quality.

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SCHEMATIC OF SEAWATERCIRCULATION SYSTEM

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SCHEMATIC OF CaCl2 BRINE CIRCULATION

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TABLE 4.8

BRINE CIRCULATION AFTER PERFORATION FOR TESTIN 1519M TO 1529M ZONE

IMPROVEMENTS IN QUALITY OF BRINE RETURNSDUE TO ACIDIFICATION AFTER INTRODUCTION OF

SIZED CALCIUM CARBONATE

Date

15.9.83

16.9.83

TimeHours

moo1425

1440

1510

1525

0010

1000

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1230

Turbidity NTU

Pre-Acid

115

42

19

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87.1

85.3

58.1

75.7

46.9

42.3'

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19.0

iiii

IIIIIIIIIIIIIII

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TABLE 4.9

BRINE CIRCULATION AFTER PERFORATION FOR TESTIN 1519M TO 1529M ZONE

IMPROVEMENTS IN BRINE QUALITY DUE TO ACIDIFICATIONAFTER INTRODUCTION OF SIZED CALCIUM CARBONATE

WELL 31/3-1

DateTime hrs

SampleParticledia. dmicrons2.02.53.04.05.07.510.015.0

15.9.831455

PreAcid

AfterAcid

%Reduction

15.9.831525

PreAcid

AfterAcid

%Reduction

Number of Particles ^ d pn (microns) in 0.05 ml

22382147744827615193702916

909431271046247501141

59.478.878.359.874.184.386.293.8

803531541420601320893711

3511724330127532453

56.377.076.878.983.473.086.572.7

Filtersinuse

Pump RateBPM I

TurbidityNTU 2.3 0.9

160.9 I 3.7 0.9 75.7

Suspendedsolidsmg/1

Ccmmsnts Brine at well inlet Brine at well outlet

IIIIIIII

II

TABLE 4.10

STABILITY OF SOLIDS LEVEL OF BRINE AT SURFACEFOR PERIOD OF ONE CIRCULATION

WELL 31/3-1

DateTime hrs

SampleParticledia. dmicrons2.02.53.04.05.07.510.015.0

19.9.831945 2130

Filter Outlet%

Change

20.9.83 - 21.9.832255 0015

Storage Tank%

Change

Number of Particles^ d urn (microns) in 0.05 nil

3128982426142491210

3131107239811640800

0.19.26.618.318.433.3

68722530971354195392210

6709218683332515434198

2.413.614.28.221.014.713.620

Filtersinuse

Comments

Pump RateBPM I

TurbidityNTU I 1.9 2.0 5.3

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Recommended Flow Rate

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Manuf a ct ure r :

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Product Code:

Rating in virgin

USED FOR BRINE FILTRATION

18 filters per pod.

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Documents

4 OIL PLUS - Forsiden - Oljedirektoratet · 2007-09-04 · 4 OIL PLUS WATER MANAGEMENT ... TABLES OIL PLUS. I I I I I I I I I I I I I I I I I I I I INTRODUCTION ... The completion