CN102828733A - Method for extracting residual crude oil in oil field by using foam compound system - Google Patents
Method for extracting residual crude oil in oil field by using foam compound system Download PDFInfo
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- CN102828733A CN102828733A CN2012103233095A CN201210323309A CN102828733A CN 102828733 A CN102828733 A CN 102828733A CN 2012103233095 A CN2012103233095 A CN 2012103233095A CN 201210323309 A CN201210323309 A CN 201210323309A CN 102828733 A CN102828733 A CN 102828733A
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- 239000003921 oil Substances 0.000 title claims abstract description 73
- 239000006260 foam Substances 0.000 title claims abstract description 61
- 150000001875 compounds Chemical class 0.000 title claims abstract description 59
- 239000010779 crude oil Substances 0.000 title claims abstract description 14
- 238000000034 method Methods 0.000 title claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 25
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 16
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 12
- 239000007789 gas Substances 0.000 claims abstract description 12
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 8
- 239000004094 surface-active agent Substances 0.000 claims abstract description 8
- 229920002401 polyacrylamide Polymers 0.000 claims abstract description 4
- 230000015572 biosynthetic process Effects 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- 239000002332 oil field water Substances 0.000 claims description 4
- 230000003213 activating effect Effects 0.000 claims 1
- 239000003795 chemical substances by application Substances 0.000 claims 1
- 238000011084 recovery Methods 0.000 abstract description 17
- 230000008901 benefit Effects 0.000 abstract description 9
- 230000001965 increasing effect Effects 0.000 abstract description 3
- 238000002347 injection Methods 0.000 description 16
- 239000007924 injection Substances 0.000 description 16
- 238000006073 displacement reaction Methods 0.000 description 15
- 239000011206 ternary composite Substances 0.000 description 8
- 229920000642 polymer Polymers 0.000 description 7
- 239000002131 composite material Substances 0.000 description 6
- 239000011148 porous material Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 230000035699 permeability Effects 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 238000000605 extraction Methods 0.000 description 4
- 238000004088 simulation Methods 0.000 description 4
- 239000003814 drug Substances 0.000 description 3
- 239000003513 alkali Substances 0.000 description 2
- 239000013043 chemical agent Substances 0.000 description 2
- 238000009533 lab test Methods 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 241000370738 Chlorion Species 0.000 description 1
- 241000521257 Hydrops Species 0.000 description 1
- 206010030113 Oedema Diseases 0.000 description 1
- 241000238590 Ostracoda Species 0.000 description 1
- 230000004520 agglutination Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000011234 economic evaluation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 239000008398 formation water Substances 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 210000003296 saliva Anatomy 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 239000010729 system oil Substances 0.000 description 1
- 238000003325 tomography Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 230000036642 wellbeing Effects 0.000 description 1
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Abstract
The invention relates to a method for extracting residual crude oil in an oil field by using a foam compound system and belongs to the technical field of tertiary oil recovery of the oil field. The method comprises the following steps: (1) performing water flooding in the earlier stage on the oil field; (2) injecting the foam compound system to a main section plug, wherein the foam compound system injected to the main section plug is formed by alternately injecting a ternary compound system and nitrogen on the basis of a liquid-gas volume ratio at 1:1; (3) injecting the foam compound system to a secondary section plug, wherein the foam compound system injected to the secondary section plug is formed by alternately injecting the ternary compound system and the nitrogen on the basis of the liquid-gas volume ratio at 0.25:1; and (4) performing the subsequent water flooding on the oil field, wherein the ternary compound system in the step (2) and step (3) is composed of 1.2wt.% of NaOH, 0.3wt.% of surface active agents, 0.15wt.% of partially hydrolyzed polyacrylamide (HPAM), and the balance of water. According to the method provided by the invention, the residual crude oil in a medium/low permeating layer is more effectively extracted and the economic benefit is increased.
Description
Technical field
The invention belongs to the tertiary oil production in oil field technology, be specifically related to a kind of foam compound system and with the method for this foam compound system exploitation oil field residual crude oil.
Background technology
At present, domestic a lot of oil fields are in the stage of high moisture, high recovery percent of reserves, and comprehensive recovery ratio is lower, many wells low yield.The eighties in 20th century, China has developed the chemical flooding tertiary oil recovery technology.Tertiary oil recovery is to utilize means such as physics, chemistry and biology, continues the remaining oil of recovery of subterranean.The chemical flooding technology is in the flourish stage now, and the chemical flooding research work of carrying out mainly comprises the binary combination flooding of polymer flooding, surfactant-alkali/polymer, and the ternary composite driving of alkali, surfactant and polymer etc.
But, generally can only improve recovery ratio about 7～15% because polymer receives the control of its mechanism of oil displacement.Binary combination flooding is because required pharmaceutical quantities is big, cost is high, and economic benefit is lower, so its application also receives certain restriction.Ternary composite driving has been taken into account the two-fold advantage of surfactant flooding and polymer profile control, and oil water interfacial tension can be effectively reduced, and its oil displacement efficiency can improve greatly on the basis that cost reduces, but recovery ratio still need continue to improve.
Foam great majority in the foam flooding finish of on the oil field, using are formulated by gas and solution on the ground; Or make the shaft bottom hydrops become foam by means of the stirring of downhole gas and the surfactant of adding; Bubble stability is poor; Skewness in the stratum is used at the scene and is received very big restriction.
Summary of the invention
The invention provides a kind of method of using foam compound system exploitation oil field residual crude oil.Foam composite flooding be ternary composite oil-displacing system in introduce gas phase, gas phase and liquid phase form foam.
Adopt following steps:
(1) oil field water drive in early stage;
(2) the principal piece plug injects the foam compound system, and the liquid gas volume ratio that the foam compound system that said principal piece plug injects press 1:1 by three-component compound system and nitrogen replaces injection and forms;
(3) secondary slug injects the foam compound system, and the liquid gas volume ratio that the foam compound system that said secondary slug injects press 0.25:1 by three-component compound system and nitrogen replaces injection and forms;
(4) follow-up water drive is carried out in the oil field;
Wherein, the three-component compound system in said step (2) and the step (3) is 1.2% (weight) NaOH, 0.3% (weight) surfactant, 0.15% (weight) partially hydrolyzed polyacrylamide (PHPA) HPAM, and surplus is a water.
Preferably, wherein surfactant is alkylbenzenesulfonate ORS-41.
Preferably, wherein, the slug of the foam compound system that the principal piece plug injects in the said step (2) is of a size of 0.1-0.3PV (Porous Volume, voids volume multiple).
Preferably, wherein, the slug of the foam compound system that secondary slug injects in the said step (3) is of a size of 0.05PV.
The invention advantage
Foam compound system provided by the invention; The formation foam can react under formation condition; The foam stabilization that generates and being evenly distributed, the foam compound system solution of adding has higher flow resistance and good mobility control ability, can enlarge displacement swept volume, strengthen washing oil ability, injection system can optionally get in less permeable layer; Better less permeable layer remaining oil in the exploitation increases economic benefit.
Description of drawings
Several kinds of displacement mode rock cores of Fig. 1 oil displacement experiment effect comparison;
Several kinds of displacement mode injection pressure contrasts of Fig. 2;
Moisture and the injection pore volume multiple relation curve of Fig. 3 centerwell;
Fig. 4 centerwell recovery ratio and injection pore volume multiple relation curve.
The specific embodiment
In order further to understand the present invention; Below in conjunction with Daqing oil field oil extraction No.1 Factory, six factory's developing example the preferred embodiment of the invention is described; Describe just to further specifying characteristics of the present invention and advantage but should be appreciated that these, rather than to the restriction of claim of the present invention.
Instance one:
The Daqing oil field 106 oil area 1.5km of six factories stake that recover the oil
2, 1,120,000 tons of crude oil reserves, demarcating recovery ratio is 29.7%.East piece core intersection is between 2.3～9.1 meters, and oil reservoir roughly is East and West direction and distributes.Belong to high pressure degree of porosity, medium permeability oil reservoir, average pore 33.9%, air permeability 556.7mD, oil reservoir are main with argillaceous agglutination, average shale content 10%, median grain diameter is 0.1mm, sorting coefficient 1.59, sorting is medium.Ground crude oil relative density 0.9382～0.9552, Crude viscosity 340mPas, paraffin content is 9.43～11.83%, and freezing point is lower, and original formation pressure is 14.08MPa, and pressure coefficient is 1.017.Formation water salinity is 2710 ~ 3666mg/L, and wherein the chlorion mass concentration is 1167 ~ 1697mg/L, is MaHCO
3The water type.
Exploitation this time mainly launches in 106 east of stake, 9 mouthfuls of the total oil-water wells in 106 east of stake, and they are 106-5,106-52,106-8, old 28,106-13,106,106-2,106-7,106-45 well.
Inject the contrast of foam compound system oil displacement efficiency.Laboratory experiment has designed water drive+foam composite flooding, water drive+ternary composite driving, water drive+polymer flooding, water drive quadruplet scheme and has carried out the oil displacement efficiency contrast.The result shows that the Fuel Oil Remaining of water drive+foam composite flooding is minimum, and it is maximum to improve the recovery ratio amplitude.Like Fig. 1.This is because ultralow interfacial tension, higher viscosity and the higher mobility control ability that foam had that the foam compound system utilizes three-component compound system to have; Shutoff high permeability zone effectively; The control water breakthrough increases oil displacement efficiency, improves swept volume.A large amount of laboratory experiments and field data synthesis display, polynary foam composite flooding oil ratio ternary composite driving improve recovery ratio and are about 8%.Wherein, water drive+ternary composite driving, water drive+polymer flooding, water drive all adopt mode well known in the art to carry out.
Water drive wherein of the present invention+foam composite flooding adopts following steps:
At first preparing three-component compound system is 1.2% (weight) NaOH, 0.3% (weight) surfactant, 0.15% (weight) partially hydrolyzed polyacrylamide (PHPA) HPAM, and surplus is a water.Adopt following steps to recover the oil then:
(1) oil field water drive in early stage;
(2) the principal piece plug injects the liquid gas volume ratio of press 1:1 by three-component compound system and nitrogen and replaces the foam compound system that injection forms;
(3) secondary slug injects the liquid gas volume ratio of press 0.25:1 by three-component compound system and nitrogen and replaces the foam compound system that injection forms;
(4) follow-up water drive is carried out in the oil field.
Inject foam compound system principal piece plug determining dimensions.Lab simulation has designed the principal piece plug and has injected compound system 0.1PV, 0.2PV, 0.3PV, 0.4PV, 0.5PV five sets of plan, sees table 1.Analog result shows, inject the foam compound system after, oil production obviously increases, but that the accumulative total of scenarios increases oily amplitude is suitable.Only see from the required expense of chemical dose that 0.1PV is more economical for scheme S1 injection slug size, technical feasibility is strong, and ratio for input and output is maximum.In view of this, inject the principal piece plug and select scheme S1 for use, it is best promptly to annotate the displacement of reservoir oil of 0.1PV foam compound system, annotates 0.2PV and takes second place.
Cun the influence of table 1 principal piece clearance gauge to oil increment
| Scheme | Slug size (PV) | Accumulative total increases oil (side) | Increase cost (ten thousand yuan) | Increase net profit (ten thousand yuan) |
| S1 | 0.1 | 1532.34 | 86 | 138.46 |
| S2 | 0.2 | 1719.95 | 172 | 120.78 |
| S3 | 0.3 | 1802.805 | 258 | 112.23 |
| S4 | 0.4 | 1893.325 | 344 | 101.37 |
| S5 | 0.5 | 1954.28 | 430 | 94.35 |
Inject the secondary slug determining dimensions of foam compound system.Lab simulation has designed simultaneously under fixing principal piece clearance gauge cun 0.1PV, injects secondary slug compound system 0.05PV, 0.06PV, 0.07PV, 0.08PV, 0.09PV five sets of plan, sees table 2.Analog result shows, inject the secondary slug of foam compound system after, oil increment obviously increases on the original basis, but that the accumulative total of scenarios increases oily amplitude is suitable.See that from required expense of chemical dose and net profit situation scheme S6 injects that secondary slug size 0.05PV is more economical, technical feasibility is also strong, and ratio for input and output is big.In view of this, inject secondary slug and select scheme S6 for use, it is better promptly to annotate the displacement of reservoir oil of 0.05PV foam compound system.
The secondary slug size of table 2 is to the influence of oil production
| Scheme | Slug size (PV) | Accumulative total increases oil (side) | Increase cost (ten thousand yuan) | Increase net profit (ten thousand yuan) |
| S6 | 0.05 | 752.46 | 43 | 63.92 |
| S7 | 0.06 | 845.54 | 51.6 | 54.19 |
| S8 | 0.07 | 913.43 | 60.2 | 47.10 |
| S9 | 0.08 | 952.41 | 68.8 | 43.02 |
| S10 | 0.09 | 985.91 | 77.4 | 39.52 |
Spot effect behind the injection foam compound system.The optimal parameter of confirming according to above simulated test can get in grand celebration six factories stake, the 106 block practice of recovering the oil, and injects the well injection pressure and rises; Like Fig. 2; Show that the foam compound system obtained good foaming effect underground, increased flow resistance, enlarged swept volume.Oilfield water flooding recovery ratio 28% in the displacement of reservoir oil of foam compound system, final raising recovery ratio 4.92% behind foam composite flooding, and reduced the block moisture content.
Economic benefit behind the injection foam compound system.Because economic 324.38 tons of the chemical agents that drop in the foam flooding, total medicament expense is with 1316.4 ten thousand yuan, and site operation and equipment etc. takes totally 74 ten thousand yuan, drops into 1390.4 ten thousand yuan of total costs.According to predicting the outcome, accumulative total increases 11424 tons of oil in 5 years, 3,500 ten thousand yuan/ton of crude oil prices, and then obtaining economic benefit is 3998.4 ten thousand yuan, ratio for input and output reaches 2.88.In view of this this technology is economically viable.
Instance two:
It is northern that disconnected east, Daqing oil field oil extraction No.1 Factory Bei Yi district is arranged in the Sa development zone, three rows North gets the Bei Yi district, and three rows in reaching in the south, to the 98# tomography, the intermediate zone to the east of the east.The oil reservoir oil area 25.79km of Sa Portugal
2, oil in place 16558.82 * 10
4T, wherein Sa+Portugal's II group reservoir geology reserves are 11673.27 * 10
4T, 70.5% of piece Sa Portugal, occupied area oil reservoir reserves, reserves abundance 452.62 * 10
4T/km
2Sa, Portugal's oil reservoir are a cover grey, celadon, brown sand shale alternating layers deposition, and bedding is main with horizontal bedding, contains the mussel-shrimp fossil.The reservoir space of oil reservoirs is main with the primary pore intergranular pore, degree of porosity 22～26%, average pore 24.32%, initial oil saturation 56～76%, air permeability 200 ~ 1600mD, mean permeability 784mD.
According to selecting well principle and standard, the well in disconnected eastern oil reservoir area, Bei Yi district is analyzed, select 8 mouthfuls of well saliva wells to carry out the water drive depth profile control, the profile control wellblock is that eight notes 21 are adopted.The profile control well group is by the totally 8 mouthfuls of water well constructions of 12-P215, middle 12-P216 among northern 1-41-P254, northern 1-41-P261, northern 1-44-P256, northern 1-44-P262, middle 11-P245, the middle 11-P252; The wellblock has 21 mouthfuls of oil wells, center extraction Jing6Kou.
Inject foam compound system principal piece plug determining dimensions.Because slug size impact oil displacement efficiency and economic evaluation effect, lab simulation has designed injection different size principal piece plug compound system five sets of plan, sees table 3.Analog result shows, scenarios accumulative total oil increment is suitable, and when scheme S3 injected principal piece clearance gauge cun 0.3PV, net profit was the highest, and technical feasibility is strong, and ratio for input and output is big.In view of this, injecting the principal piece plug, to select for use scheme S3 promptly to annotate the displacement of reservoir oil of 0.3PV foam compound system better.
Cun the influence of table 3 principal piece clearance gauge to oil production
| Scheme | Slug size (PV) | Accumulative total increases oil (side) | Increase cost (ten thousand yuan) | Increase net profit (ten thousand yuan) |
| S1 | 0.1 | 1431.37 | 86 | 109.97 |
| S2 | 0.2 | 1505.83 | 172 | 122.19 |
| S3 | 0.3 | 1691.61 | 258 | 143.01 |
| S4 | 0.4 | 1783.81 | 344 | 127.32 |
| S5 | 0.5 | 1826.59 | 430 | 110.76 |
Inject the secondary slug determining dimensions of foam compound system.Lab simulation has designed simultaneously under fixing principal piece clearance gauge cun 0.3PV, injects the secondary slug compound system of different size five sets of plan, sees table 4.Analog result shows that the injection of secondary slug has obviously improved recovery ratio once more.But the scenarios oil increasing effect is more or less the same, and in conjunction with medicament expense and net profit situation, scheme S6 injects that secondary slug size 0.05PV is more economical, and technical feasibility is also strong, and ratio for input and output is big.In view of this, injecting secondary slug, to select for use scheme S6 promptly to annotate the displacement of reservoir oil of 0.05PV foam compound system better.
The secondary slug size of table 4 is to the influence of oil production
| Scheme | Slug size (PV) | Accumulative total increases oil (side) | Increase cost (ten thousand yuan) | Increase net profit (ten thousand yuan) |
| S6 | 0.05 | 843.41 | 43 | 54.42 |
| S7 | 0.06 | 952.06 | 51.6 | 43.07 |
| S8 | 0.07 | 1013.93 | 60.2 | 36.60 |
| S9 | 0.08 | 1054.28 | 68.8 | 32.39 |
| S10 | 0.09 | 1092.47 | 77.4 | 28.39 |
Spot effect behind the injection foam compound system.According to the optimal parameter that above simulated test is confirmed, practice can get in grand celebration oil extraction No.1 Factory Bei Yi district, and it is long that foam and ternary composite driving contrast big, the low Water-cut Period time of moisture fall, like Fig. 3.Foam flooding improves 30 percentage points of recovery ratios than water drive, improves 10 percentage points of recovery ratios than ternary composite driving, like Fig. 4.
Economic benefit behind the injection foam compound system.Owing to drop into 421.67 tons of chemical agents in the foam flooding, total medicament expense is with 1512.7 ten thousand yuan, and site operation takes and shared 89.4 ten thousand yuan of installation cost, amounts to 1602.1 ten thousand yuan.According to predicting the outcome, accumulative total increases 11373.9 tons of oil in 5 years, and 3,500 ten thousand yuan/ton of crude oil prices obtain 3980.965 ten thousand yuan of economics well-being of workers and staff, and ratio for input and output reaches 2.48.
Claims (4)
1. method of exploiting the oil field residual crude oil is characterized in that adopting following steps:
(1) oil field water drive in early stage;
(2) the principal piece plug injects the foam compound system, and the foam compound system that said principal piece plug injects is multiple by ternary
Formation is alternately injected with the liquid gas volume ratio that nitrogen is pressed 1:1 by zoarium system;
(3) secondary slug injects the foam compound system, and the foam compound system that said secondary slug injects is multiple by ternary
Formation is alternately injected with the liquid gas volume ratio that nitrogen is pressed 0.25:1 by zoarium system;
(4) follow-up water drive is carried out in the oil field;
Wherein, the three-component compound system in said step (2) and the step (3) is 1.2wt%NaOH, 0.3wt%
Surfactant, 0.15wt% partially hydrolyzed polyacrylamide (PHPA) HPAM, surplus is a water.
2. like the method for the said exploitation of claim 1 oil field residual crude oil, it is characterized in that surface wherein
Activating agent is alkylbenzenesulfonate ORS-41.
3. like the method for the said exploitation of claim 1 oil field residual crude oil, it is characterized in that: wherein, said
The slug of the foam compound system that the principal piece plug injects in the step (2) is of a size of 0.1-0.3PV.
4. like the method for the said exploitation of claim 1 oil field residual crude oil, it is characterized in that: wherein, said
The slug of the foam compound system that secondary slug injects in the step (3) is of a size of 0.05PV.
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| CN201210323309.5A CN102828733B (en) | 2012-09-04 | 2012-09-04 | Method for extracting residual crude oil in oil field by using foam compound system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109973062A (en) * | 2017-12-28 | 2019-07-05 | 东北石油大学 | A kind of five or three slug system of note of optimization |
| CN111472736A (en) * | 2020-04-22 | 2020-07-31 | 中海石油（中国）有限公司天津分公司 | Offshore oilfield combined profile control and flooding optimization design method and device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5835883A (en) * | 1997-01-31 | 1998-11-10 | Phillips Petroleum Company | Method for determining distribution of reservoir permeability, porosity and pseudo relative permeability |
| WO1999051854A1 (en) * | 1998-04-06 | 1999-10-14 | Da Qing Petroleum Administration Bureau | A foam drive method |
| CN101012744A (en) * | 2006-10-30 | 2007-08-08 | 大庆油田有限责任公司 | Nitrogen foam adjusting-actuating segment plug injection technique |
-
2012
- 2012-09-04 CN CN201210323309.5A patent/CN102828733B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5835883A (en) * | 1997-01-31 | 1998-11-10 | Phillips Petroleum Company | Method for determining distribution of reservoir permeability, porosity and pseudo relative permeability |
| WO1999051854A1 (en) * | 1998-04-06 | 1999-10-14 | Da Qing Petroleum Administration Bureau | A foam drive method |
| CN101012744A (en) * | 2006-10-30 | 2007-08-08 | 大庆油田有限责任公司 | Nitrogen foam adjusting-actuating segment plug injection technique |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109973062A (en) * | 2017-12-28 | 2019-07-05 | 东北石油大学 | A kind of five or three slug system of note of optimization |
| CN111472736A (en) * | 2020-04-22 | 2020-07-31 | 中海石油（中国）有限公司天津分公司 | Offshore oilfield combined profile control and flooding optimization design method and device |
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