The experience in carrying out measures of increasing reservoir recovery on the oilfields of RUE

1
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The experience in carrying out measures of
increasing reservoir recovery on the oilfields
of RUE PA Belarusneft
Demianenko N.A., Pysenkov V.G. BelNIPIneft, Gomel
2
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Main problems of oil production

• coming of the oilfields which give the main oil
  production into the stage of complete
  development
• negative tendencies
• production drawdown, growth of water intrusion
  of the obtaining production, deterioration of
  properties and growth of oil reserves of
  difficult extraction
• difficult geological conditions of deposits
  development
• reservoirs, mainly of carbonaceous type with
  high heterogeneity of filtration which takes
  place because of caverns and fractures presence-
• low efficiency of oil-driving with water
  flooding, water inrush in filtrated channels of
  high porosity, early water intrusion in producing
  wells, irregular excavation of reserves in area
  and section

3

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• The most important reserve in overcoming those
  problems -holding measures of increasing
  reservoir recovery
• Main methods on the oilfields of RUE PA
  Belorusneft are physical-chemical methods of
  bed stimulation increasing reservoirs coverage
  with displacement with the help of injection in
  pumping and temporarily shut-in producing wells
  of compositions of deviating flow

4

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  (3000-4500 ?)
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• ?????????? ??????????? (70-100º ?) ?
  ????????????? ????????? ??? (150-300 ?/?)
• ??????? ?????????? ? ???? ???????? ??????? ?
  ?????? (?? 140 ?/?)

• Geological conditions which impose restrictions
  on technological characteristics of the used
  compositions of deviating flow
• deep bedding of productive deposit (3000-4500 m)
• carbonaceous reservoirs
• elevated temperature (70-100º ?) and
  mineralization of fossils waters(150-300 g/l)
• high content of calcium chloride and magnesium in
  water (till 140 g/l)

5

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• ???????? ??? 20º ? ?? ????? 20 ????, ???
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  ??? ???????????? 70-100º ? ?? ????? 5 ????? ?
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• When choosing compositions of deviating flow one
  should make to them next demands
• good filtration in bed
• ability to create in the watered channels of high
  permeability screens of deviating flow with
  high hydrodynamic resistance
• inertia to oil (compatibility with hydrocarbons)
• viscosity at 20º ? no more than 20 mPas which
  provides sufficient fluidity at significant
  speeds of displacement
• period of loss in the bed of prime fluidity at
  temperatures 70-100º ? no less than 5 hours in
  presence of the reactive components of
  bed-carbonate rock and reservoir water of high
  mineralization

6

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• structural stability of the created screens of
  deviating flow in bed under the influence of
  elevated temperature, pressure gradient, chemical
  and microbiological agent
• manufacturabilityconvenience in use at batching,
  letdown, batch mixing of components of
  compositions, injection in well with the help of
  standard oil-field equipment
• resistance to the influence of the environmental
  aspect when using the standard receptacle,
  possibility of transportation and storage with
  common means
• availability and rather low price of components

7
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Stages of execution phase

1. Layout of seepages with chemical indicators
2. Determination of pumping and temporarily shut-in
   producing wells in which its necessary to
   inject agents of deviating flow guarantees the
   achievement of the necessary effect
3. Determination of volume and structural-mechanical
   characteristics that are necessary for the
   effective work of compositions

8
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   ?????? ????? 3-? ???????, ??????????? ???????????
3. ?????? ??????????? ????????????? ??????????? ?????

Stages of execution phase

1. Preparation of works program that includes
   validation of works reasonability, calculation of
   expected additional oil production and
   profitability of works
2. On the areas of deposits, with expected rate of
   return more than 15 and pay-off period less than
   3 months, measures are fulfilled
3. Estimation of real efficiency of performed works

9

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• Stages 1 and 2 are fulfilled together with the
  institute BelNIPIneft and oil and gas producing
  enterprise Rechitsaneft
• Stages 3 and 4 are fulfilled by the institute
  BelNIPIneft and conform with technological and
  planned-economic services of RUE
  PA Belorusneft
• Stage 5 is fulfilled by the Service of Increasing
  Reservoir Recovery and Wells Repair with the
  engineering maintenance of works by BelNIPIneft
• Stage 6 is fulfilled by NGDU and BelNIPIneft

10
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Indicated research help to determine

• Moving direction of seepages
• Pattern of hydrodynamic relationship between the
  producing and pumping wells
• Measure of influence of pumping wells on the
  producing wells
• Speed of moving of seepages
• Number of the flow matrix in which water entries
  from pumping to the producing wells
• Absolute permeability of flushed zones
• Presence of zones of high permeability and their
  productivity
• Volume of seepage path
• Filtration heterogeneity of bed
• Order of bed covering with displacement
• Volumes of water which entries from pumping to
  producing wells
• Wide information for analyses of oil-pool
  development and planning measures for reservoir
  coverage with displacement

11
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?????? ??????? ??????? ???????? 5-10
?3???????????? ?????? ???? 50-90 ????? ??
???????? ????? ???????? 60-70 ?????
Using indicators

• fluorescein
• carbamide
• Ammonium nitrate
• Ammonium rodanite
• thiocarbamide

Volumes of injection of labeled liquid 5-10
m3 Duration of sampling - 50-90 days Of bulk
objects - 60-70 days
12
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The results of layout of seepages on the sub salt
deposit of the oilfield Vishanskoe
13
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Oilfield Vishanskoe
14
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?????????????? ??????? ?? ?????????????? ????????
63 ?????????? ?????????????
Diagrams of speedes and destribution of seepages
from pumping well 63 of the oilfield Vishanskoe
15
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??????? ?????????????? ???. 63 ??????????
?????????????
Geological-and-physical characteristics of
reservoirs in the zone of influence of the
injection well 63 of the oilfield Vishanskoe
16
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Main used compositions
??????? ????????? ? ?????? ??????? Lignopole
solution with liquid glass
?????? ?????? ? ???????????? ????? Liquid glass
with caustic soda
??????-???????????? ???????? Hypano-bentonite
solutions
???-1 ? ?????? ??????? Water Influx Catcher-1
with liquid glass
???????? ?????? ? ?????? ??????? Hypane solutions
with liquid glass
???????????? ???? ? ??????? Caustic soda with
hypane
???????? ?? ?????? ??? Solutions on base of
Polyacrylamide
?????? ??????? ????????? ?? 500 ?? 6000 ?3
Volumes of agents injection from 500 till 6000
m3

17
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??? ? ????? (V) ??????? ?????????????????
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???????? (?), ??????????????????? ??????????? ?
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(???) ???????? ???????????
????? ? ?????? ?????????? ?? ?????? ?, ???? ??? ?, º? ?, ???? ??? ?, º? ??????????? ?????????? ?????????????????? ????????? ??????????? ?????????? ?????????????????? ????????? ??????????? ?????????? ?????????????????? ????????? ???, ?3/(??????) ????? ???????-?????? ?????????? V ?? ???? ????????-????????4, ?3
????? ? ?????? ?????????? ?? ?????? 20 701 ???????? ???????-?????2 ??????????? ??????????, 3 ?????????? ?? ?????? ?????3, ?? ???, ?3/(??????) ????? ???????-?????? ?????????? V ?? ???? ????????-????????4, ?3
1. ???-1 ??5 ?????? 2. ???-1 Na2CO3 3. ???? ??5 4. ??? ?????? ????? 5. ??? ??5 9,5 8,8 11,0 8,26 6,77 4,96 4,28 3,3 3,0 3,9 3,66 3,07 2,16 1,98 ?? ?? ?? ?? ?? ?? ?? 46,7 53,3 50,0 56,0 ?? ??????????? 22 10 21-22 14 4-15 1530 30-50 gt 50 4 4,5 1-3 1-3 5001000 10001500 15002000 gt 2000
??????????. 1 ??????????????? ??????????? 2
?? ????????????????? ? ???????? ?
???????????????? ????????? ????? ??
???????????? ?? ??????? ??????????????? 3 ???
70 º? 4 ????? ??????????? ?????????????? ??
??????????? ????????????? ?????????????? ???????
5 ?????? ?????? 6 ??? DP9-8177
????????????????????????? ???? 7 ? 8 ???
Alcoflood 955 ???????????? 7 ????????? (?
1,10 ?/??3) ????, 8 ????????????? ????
18
PROCESSING CHARACTERISTICS OF COMPOSITIONS FOR
INCREASING RESERVOIR RECOVERY AND CRITERIAS OF
SELECTION ACCORDING TO SPECIFICITY OF THE
RECIPIENT
Type and volume (V) of compositions injection of
flow inclination according to their dynamic
viscosity (?),gel-forming capability of in-place
conditions and injectivity index of the recipient
Number and compound of orienting composition ?, mPas at ?, º? ?, mPas at ?, º? Structure rates of flow declination material Structure rates of flow declination material Structure rates of flow declination material Permeability index, ?3/(daysMPa) Number of recom-mended composi-tions Volume on one well-operation4, ?3
Number and compound of orienting composition 20 701 Formation mechanics Static water loss, 3 Diffluence on the cone AzNII3, sm Permeability index, ?3/(daysMPa) Number of recom-mended composi-tions Volume on one well-operation4, ?3
1. water influx catcher-1 LG5 2. water liquid catcher-1 Na2CO3 3. VPRG LG5 4. polyacrylamide chrome acetate 5. polyacrylamide LG5 9,5 8,8 11,0 8,26 6,77 4,96 4,28 3,3 3,0 3,9 3,66 3,07 2,16 1,98 sl sl sl gl gl sl sl 46,7 53,3 50,0 56,0 No spread 22 10 21-22 14 4-15 1530 30-50 gt 50 4 4,5 1-3 1-3 5001000 10001500 15002000 gt 2000
Note. 1 temperature of average bed 2 sl
sludging in contact with mineralized oil-field
water gl regulated in time helium formation 3
at 70 º? 4 volume of influence is corrected
according to results of seepages routing 5 LG
liquid glass 6 - polyacrylamide DP9-8177,
solvent tap water 7 ? 8 polyacrylamide
Alcoflood 955, Solvents 7 tabular (?1,10
g/sm3) and 8 tap waters
19
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Appearance of the materials of flow inclination
after structure formation
???-1 ?????? ?????? Water influx catcher-1
liquid glass
???-1 Na2CO3 water influx catcher-1 Na2CO3
???? ?????? ?????? VPRG liquid glass
?????? ?????? Liquid glass
??? ?????? ?????? Polyacrylamide liquid glass
20
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????????????
Scheme of well binding at preparing and injection
of compositions using standard equipment

???? Water
?????????? ????????? Electric mixer
????????? 3 Component 3
?? 320
3
2
0
????????? 1 Component 1
???????? WELL
??????? ? ???????? ?? Volume with stirrer
??-320
2
0
3
????????? 2 Component 2
??-320
3
2
0
21
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?????????????????? ??????????? ?????????
??????????? ????????? (????-3)
Scheme of well binding at preparing and injection
compositions using complex automated equipment of
agents batching
???? COMPLEX EQUIPMENT FOR AGENTS INJECTION IN BED
???????? Well
22
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66 (?) ? ???????? ?????????? ????? ?? ?????????
?????? IV ????? (b) ????????? ????????????? ?
?? ? ? ????? ?????????? ??? ?? ??????????
?????? ??????? ??????????? ? ???????????
????????????????? ?????????? ???-1 ??
Pattern of changes of injectivity profile 66 (a)
and dynamics of oil displacement from deposit
zadonskaya IV formation (b) of oil-field
Rechitskoe A-before and B after holding
geological and technical engineering measures of
increasing bed coverage with water flooding
using compositions of deviating flow WATER
INFLUX CATCHER-1LIQUID GLASS
?
b
Q?, Q?, Q?.???. ??????????? ?????? ????????,
????? ? ??????????? ?????????????? ?????? ?????

?
,
?


Q?, Q?, Q?.???. Cumulative production of
liquid, oil and cumulativeaditional production of
oil
?
2190
2140000
2000
2192
?

?

1800
???????? ???????????? ???????? ????????????
1600
2120000
2200
1400
???????? ?????????? ???????? ??????????
1200
?

?
,
.

?
,
?
?
2100000
1000
?

Q
?
Q
2210
800
A
600
2080000
400
2220
200
2060000
0
2225
2
6
2
3
4
5
6
7
8
9
0
1
2
1
0
1
1
1
0
2
.2006
/
1
l
g

Q
?
,


?

/
1
1
23
????????????? ????? ?? ??? ?? 2001-2005 ??. ??
01.12.2005 ?.
Operating efficiency of reservoir recovery
increasing in 2001-2005on 01.12.2005
24
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?????????????
Schedule of production of sub salt well,
oil-field Vishanskoe
25
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Cost of compositions of flow declination
? ?????????? ?compositions ?????? ?????????? Compositions formula ????????? 1 ?3 ??????? ?????????, Cost 1 m3 of process solutions,
1 ???-1 WATER INFLUX CATCHER-1 ?????? ?????? Liquid glass ???? ??????? Soft water 56
2 ???-1 WATER INFLUX CATCHER-1 ???? ???????????????? soda ash ???? ??????? Soft water 48
3 ???? VPRG ?????? ?????? Liquid glass ???? ??????? Soft water 76
4 ????????????? (Alcoflood 955) Polyacrylamide (Alcoflood 955) ?????? ????? Chromium acetate ???? ????????? (?1,10 ?/??3) Fossil water (?1,10 g/sm3) 11
5 ????????????? (Alcoflood 955) Polyacrylamide (Alcoflood 955) ?????? ?????? Liquid glass ???? ??????? Soft water 16
26

• ?????????? ????? 100
• ??????? ?????????????? ?????? ????? ?? ????
  ??????????? ???????? ?? 400 ?? 1000 ?
• ???????????? ??????? ?? 6-12 ???????
• ??????????? ?????? ?? 300-400

• Success of works 100
• Average additional oil production on one reactive
  well from 400 to 1000t
• Duration of effect till 6-12 months
• Payback till 300-400