CN102828733B - 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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- CN102828733B CN102828733B CN201210323309.5A CN201210323309A CN102828733B CN 102828733 B CN102828733 B CN 102828733B CN 201210323309 A CN201210323309 A CN 201210323309A CN 102828733 B CN102828733 B CN 102828733B
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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 tertiary oil production in oil field technology, be specifically related to a kind of foam compound system and the method by this foam compound system exploitation oil field residual crude oil.
Background technology
At present, domestic a lot of oil field is in the stage of High water cut, high recovery percent of reserves, and comprehensive recovery is lower, many wells low yield.The eighties in 20th century, China has developed chemical flooding tertiary oil recovery technology.Tertiary oil recovery utilizes physics, chemistry and the means such as biological, continues the remaining oil of recovery of subterranean.Present chemical flooding technology is in the flourish stage, and the chemical flooding research work carried out mainly comprises the binary combination flooding of polymer flooding, surfactant-alkali/polymer, and the ternary composite driving etc. of alkali, surfactant and polymer.
But because polymer is by the control of its mechanism of oil displacement, generally recovery ratio about 7 ~ 15% can only be improved.Binary combination flooding is because required pharmaceutical quantities is large, cost is high, and economic benefits comparison is low, and therefore its application is also subject to certain restrictions.Ternary composite driving has taken into account the two-fold advantage of surfactant flooding and polymer profile control, and oil water interfacial tension can be effectively reduced, and on the basis that cost reduces, its oil displacement efficiency can improve greatly, but recovery ratio still needs to continue to improve.
Foam great majority in the foam flooding finish that oil field is applied are formed by gas and solution preparation on the ground, or make shaft bottom hydrops become foam by means of the stirring of downhole gas and the surfactant that adds, bubble stability is poor, skewness in the earth formation, application is very restricted at the scene.
Summary of the invention
The invention provides a kind of method using foam compound system to exploit 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) principal piece plug injects foam compound system, and the liquid gas volume ratio alter least-squares that the foam compound system that described principal piece plug injects presses 1:1 by three-component compound system and nitrogen is formed;
(3) secondary slug injects foam compound system, and the liquid gas volume ratio alter least-squares that the foam compound system that described secondary slug injects presses 0.25:1 by three-component compound system and nitrogen is formed;
(4) sequent water flooding is carried out in oil field;
Wherein, the three-component compound system in described step (2) and step (3) is 1.2%(weight) NaOH, 0.3%(weight) surfactant, 0.15%(weight) partially hydrolyzed polyacrylamide (PHPA) HPAM, surplus is water.
Preferably, surfactant is wherein alkylbenzenesulfonate ORS-41.
Preferably, wherein, in described step (2), the slug size of the foam compound system that principal piece plug injects is 0.1-0.3PV(Porous Volume, pore volume injected).
Preferably, wherein, in described step (3), the slug size of the foam compound system that secondary slug injects is 0.05PV.
Invention advantage
Foam compound system provided by the invention, can be reacted formation foam under formation conditions, generate foam stabilization and be evenly distributed, the foam compound system solution added has higher flow resistance and good mobility control ability, the swept volume of displacement can be expanded, strengthen washing oil ability, injection system can optionally enter middle less permeable layer, less permeable layer remaining oil in better exploitation, increases economic benefit.
Accompanying drawing explanation
Several displacement mode core oil-displacement test of Fig. 1 Contrast on effect;
Several displacement mode injection pressure contrast of Fig. 2;
Fig. 3 centerwell is moisture with injection pore volume multiple relation curve;
Fig. 4 centerwell recovery ratio and injection pore volume multiple relation curve.
Detailed description of the invention
In order to understand the present invention further, 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, but should be appreciated that these describe just for further illustrating the features and advantages of the invention, instead of limiting to the claimed invention.
Example one:
Daqing oil field recovers the oil six factories stake, 106 pieces of oil area 1.5km
2, crude oil reserve 1,120,000 tons, demarcating recovery ratio is 29.7%.East block core intersection is between 2.3 ~ 9.1 meters, and oil reservoir roughly distributes in East and West direction.Belong to High porosity, medium permeability oil reservoir, average pore 33.9%, air permeability 556.7mD, oil reservoir is based on argillaceous agglutination, and average shale content 10%, median grain diameter is 0.1mm, sorting coefficient 1.59, and sorting is medium.Ground relative oil 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 chlorine ions concentration is 1167 ~ 1697mg/L, is MaHCO
3water type.
This time exploitation mainly launches in stake 106 pieces of east, and stake 106 pieces of east have oil-water well 9 mouthfuls, they be 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 devises water drive+foam composite flooding, water drive+ternary composite driving, water drive+polymer flooding, water drive four sets of plan carry out oil displacement efficiency contrast.The Fuel Oil Remaining of result display water drive+foam composite flooding is minimum, improves recovery ratio amplitude maximum.As Fig. 1.This is because the higher mobility control ability that ultralow interfacial tension, higher viscosity and foam that foam compound system utilizes three-component compound system to have have, shutoff high permeability zone effectively, control water breakthrough, increase oil displacement efficiency, improve swept volume.A large amount of laboratory experiment and field data synthesis display, polynary foam composite flooding oil ratio ternary composite driving improves recovery ratio and is 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.
Wherein water drive of the present invention+foam composite flooding adopts following steps:
First prepare three-component compound system be 1.2%(weight) NaOH, 0.3%(weight) surfactant, 0.15%(weight) partially hydrolyzed polyacrylamide (PHPA) HPAM, surplus is water.Then following steps are adopted to recover the oil:
(1) oil field water drive in early stage;
(2) principal piece plug injects the foam compound system that the liquid gas volume ratio alter least-squares of pressing 1:1 by three-component compound system and nitrogen is formed;
(3) secondary slug injects the foam compound system that the liquid gas volume ratio alter least-squares of pressing 0.25:1 by three-component compound system and nitrogen is formed;
(4) sequent water flooding is carried out in oil field.
Inject the determination of the main slug size of foam compound system.Lab simulation devises principal piece plug and injects compound system 0.1PV, 0.2PV, 0.3PV, 0.4PV, 0.5PV five sets of plan, in table 1.Analog result shows, after injecting foam compound system, oil production obviously increases, but the oily amplitude of accumulative increasing of each scheme is suitable.Only chemically expense needed for dosage is seen, it is more economical that scheme S1 injects slug size 0.1PV, and technical feasibility is strong, and ratio for input and output is maximum.In view of this, inject principal piece plug and select scheme S1, namely the displacement of reservoir oil of note 0.1PV foam compound system is best, and note 0.2PV takes second place.
The main slug size of table 1 is on the impact of oil increment
| Scheme | Slug size (PV) | Accumulative increasing 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 determination of the secondary slug size of foam compound system.Lab simulation devises under fixing main slug size 0.1PV simultaneously, injects secondary slug compound system 0.05PV, 0.06PV, 0.07PV, 0.08PV, 0.09PV five sets of plan, in table 2.Analog result shows, after injecting the secondary slug of foam compound system, oil increment obviously increases on the original basis, but the oily amplitude of accumulative increasing of each scheme is suitable.Chemically expense needed for dosage and net profit situation are seen, it is more economical that scheme S6 injects secondary slug size 0.05PV, and technical feasibility is also strong, and ratio for input and output is large.In view of this, inject secondary slug and select scheme S6, namely the displacement of reservoir oil of note 0.05PV foam compound system is better.
The secondary slug size of table 2 is on the impact of oil production
| Scheme | Slug size (PV) | Accumulative increasing 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 |
Inject the spot effect after foam compound system.According to the optimal parameter that above simulated test is determined, can obtain in grand celebration six factory's Zhuang 106 block practice of recovering the oil, Injection Well injection pressure rises, as Fig. 2, show that foam compound system achieves good foaming effect in underground, add flow resistance, expand swept volume.Oilfield water flooding recovery ratio 28% in the foam compound system displacement of reservoir oil, final raising recovery ratio 4.92% after foam composite flooding, and reduce block moisture content.
Inject the economic benefit after foam compound system.Due to economic input chemical agent in foam flooding 324.38 tons, total medicament expense is with 1316.4 ten thousand yuan, and site operation and equipment etc. take totally 74 ten thousand yuan, drops into total cost 1390.4 ten thousand yuan.According to predicting the outcome, accumulative increasing oil 11424 tons in 5 years, crude oil price 3,500 ten thousand yuan/ton, then obtaining economic benefit is 3998.4 ten thousand yuan, and ratio for input and output reaches 2.88.In view of this this technology is economically viable.
Example two:
Breaking in one district, Daqing oil field oil extraction No.1 Factory north, to be arranged in Sa development zone northern in east, arranges, three rows in reaching in the south, to 98# tomography, to the east of east intermediate zone North gets Bei Yiqu tri-.Sa Portugal oil reservoir oil area 25.79km
2, oil in place 16558.82 × 10
4t, wherein II group, Sa+Portugal reservoir geology reserves are 11673.27 × 10
4t, 70.5% of Kuai Sa Portugal, occupied area oil reservoir reserves, reserves abundance 452.62 × 10
4t/km
2.Sa, Portugal's oil reservoir be a set of grey, celadon, brown sand-mud interbed deposition, bedding based on horizontal bedding, containing Ostracods.The reservoir space of oil reservoirs based on 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 well selecting principle and standard, the break well in eastern oil reservoir area of Dui Bei mono-district is analyzed, and select 8 mouthfuls of well saliva wells to carry out water drive depth profile control, profile control wellblock is that eight notes 21 are adopted.Profile control well group is by the totally 8 mouthfuls of water well constructions of 12-P215, middle 12-P216 in northern 1-41-P254, northern 1-41-P261, northern 1-44-P256, northern 1-44-P262, middle 11-P245, middle 11-P252, wellblock has 21 mouthfuls of oil wells, center extraction Jing6Kou.
Inject the determination of the main slug size of foam compound system.Because slug size affects oil displacement efficiency and economic evaluation effect, lab simulation devises and injects different size principal piece plug compound system five sets of plan, in table 3.Analog result shows, it is suitable that each scheme adds up oil increment, and when scheme S3 injects main slug size 0.3PV, net profit is the highest, and technical feasibility is strong, and ratio for input and output is large.In view of this, injecting principal piece plug, to select scheme S3 namely to note the displacement of reservoir oil of 0.3PV foam compound system better.
The main slug size of table 3 is on the impact of oil production
| Scheme | Slug size (PV) | Accumulative increasing 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 determination of the secondary slug size of foam compound system.Lab simulation devises under fixing main slug size 0.3PV simultaneously, injects different size secondary slug compound system five sets of plan, in table 4.Analog result shows, the injection of secondary slug obviously improves recovery ratio again.But each scheme oil increasing effect is more or less the same, use and net profit situation in conjunction with medicament expense, it is more economical that scheme S6 injects secondary slug size 0.05PV, and technical feasibility is also strong, and ratio for input and output is large.In view of this, injecting secondary slug, to select scheme S6 namely to note the displacement of reservoir oil of 0.05PV foam compound system better.
The secondary slug size of table 4 is on the impact of oil production
| Scheme | Slug size (PV) | Accumulative increasing 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 |
Inject the spot effect after foam compound system.According to the optimal parameter that above simulated test is determined, in Daqing Oil Factory north, one district's practice can obtain, and it is long that foam and ternary composite driving contrast moisture fall large, the low Water-cut Period time, as Fig. 3.Foam flooding improves recovery ratio 30 percentage points than water drive, improves recovery ratio 10 percentage points, as Fig. 4 than ternary composite driving.
Inject the economic benefit after foam compound system.Owing to dropping into chemical agent 421.67 tons in foam flooding, total medicament expense is with 1512.7 ten thousand yuan, and site operation takes and installation cost shares 89.4 ten thousand yuan, amounts to 1602.1 ten thousand yuan.According to predicting the outcome, accumulative increasing oil 11373.9 tons in 5 years, crude oil price 3,500 ten thousand yuan/ton, obtain economic well-being of workers and staff 3980.965 ten thousand yuan, ratio for input and output reaches 2.48.
Claims (2)
1. exploit a method for oil field residual crude oil, it is characterized in that adopting following steps:
(1) oil field water drive in early stage;
(2) principal piece plug injects foam compound system, and the liquid gas volume ratio alter least-squares that the foam compound system that described principal piece plug injects presses 1:1 by three-component compound system and nitrogen is formed;
(3) secondary slug injects foam compound system, and the liquid gas volume ratio alter least-squares that the foam compound system that described secondary slug injects presses 0.25:1 by three-component compound system and nitrogen is formed;
(4) sequent water flooding is carried out in oil field;
Wherein, described step (2) and the middle three-component compound system of step (3) are 1.2wt%NaOH, 0.3wt% surfactant, 0.15wt% partially hydrolyzed polyacrylamide (PHPA) HPAM, and surplus is water;
Wherein, in described step (2), the slug size of the foam compound system that principal piece plug injects is 0.2-0.3PV; Wherein, in described step (3), the slug size of the foam compound system that secondary slug injects is 0.05PV.
2. method according to claim 1, is characterized in that: surfactant is alkylbenzenesulfonate ORS-41.
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| CN111472736B (en) * | 2020-04-22 | 2022-05-06 | 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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| Publication number | Priority date | Publication date | Assignee | Title |
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| US5835883A (en) * | 1997-01-31 | 1998-11-10 | Phillips Petroleum Company | Method for determining distribution of reservoir permeability, porosity and pseudo relative permeability |
| 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 |
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| US6439308B1 (en) * | 1998-04-06 | 2002-08-27 | Da Qing Petroleum Administration Bureau | Foam drive method |
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| 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 |
| 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 |
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