CN106321037A - Method for monitoring displacement effect and pollution radius of polymer - Google Patents
Method for monitoring displacement effect and pollution radius of polymer Download PDFInfo
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- CN106321037A CN106321037A CN201610816648.5A CN201610816648A CN106321037A CN 106321037 A CN106321037 A CN 106321037A CN 201610816648 A CN201610816648 A CN 201610816648A CN 106321037 A CN106321037 A CN 106321037A
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- 229920000642 polymer Polymers 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000012544 monitoring process Methods 0.000 title claims abstract description 9
- 230000000694 effects Effects 0.000 title abstract description 7
- 238000006073 displacement reaction Methods 0.000 title abstract 3
- 239000003129 oil well Substances 0.000 claims abstract description 34
- 230000035699 permeability Effects 0.000 claims abstract description 29
- 238000012360 testing method Methods 0.000 claims abstract description 24
- 238000004458 analytical method Methods 0.000 claims abstract description 12
- 238000004519 manufacturing process Methods 0.000 claims abstract description 9
- 238000005259 measurement Methods 0.000 claims abstract description 4
- 230000000903 blocking effect Effects 0.000 claims description 7
- 238000007405 data analysis Methods 0.000 claims description 7
- 239000012530 fluid Substances 0.000 claims description 6
- 238000002347 injection Methods 0.000 claims description 6
- 239000007924 injection Substances 0.000 claims description 6
- 239000000243 solution Substances 0.000 claims description 6
- 238000003556 assay Methods 0.000 claims description 5
- 230000001133 acceleration Effects 0.000 claims description 4
- 230000005484 gravity Effects 0.000 claims description 4
- 238000005086 pumping Methods 0.000 claims description 4
- 238000012546 transfer Methods 0.000 claims description 3
- 230000008595 infiltration Effects 0.000 claims 1
- 238000001764 infiltration Methods 0.000 claims 1
- 239000007788 liquid Substances 0.000 abstract description 7
- 230000002265 prevention Effects 0.000 abstract 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000001965 increasing effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
- E21B49/008—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells by injection test; by analysing pressure variations in an injection or production test, e.g. for estimating the skin factor
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- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Geophysics (AREA)
- Measuring Fluid Pressure (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention discloses a method for monitoring the displacement effect and pollution radius of polymer. The method comprises the steps of 1, arranging a blowout prevention pipe at the wellhead of an oil well, placing a tool string down into the oil well to refloat a Y-shaped blanking plug, and lifting the Y-shaped blanking plug into the blowout prevention pipe; 2, rotating the wellhead, and placing another tool string down into the well for making a wiper trip, wherein the diameter, length and mass of the tool string is equivalent to that of a piezometer; 3, starting up a pump for production, shutting down the pump and closing the well after the output liquid is stable, and conducting a pressure buildup test using the piezometer of the pump operating condition in the oil well, then obtaining the bottom hole pressure of the oil well according to the pressure test results; 4, analyzing and interpreting the pressure data on the bottom hole pressure of the oil well using a pressure analysis module, and obtaining the permeability of an oil layer; comparing the permeability with that of the oil layer before polymer flooding, and obtaining the displacement effect of the polymer. The parameters, such as skin factor and well-bore storage factor, can be further obtained through pressure interpretation, the pollution level of the reservoir stratum is further identified, so it is convenient to adopt corresponding measurements in time, the liquid-producing capacity of the oil well is enhanced and the polymer flooding effect is improved.
Description
Technical field
The present invention relates to a kind of monitoring polymer Flooding Efficiency and the method for pollution radius, belong to oil development technology neck
Territory.
Background technology
At present, technique of polymer flooding should in many oil fields large-scale promotion as a kind of important means improving recovery ratio
With.But, after polymer solution entrance oil reservoir forms effective slug, As time goes on, many producing wells are shown in poly-, thus carry
The problems such as such as blocking, the Produced Liquid process come cause the concern in each oil field.Particularly polymer plugging can cause resistance
More much larger for period than waterflooding extraction with residual resistive, occur that oilwell produced fluid amount declines to a great extent not even production fluid, so that oil-producing
Measuring relatively low, poly-to drive oil increasing effect inconspicuous.Meanwhile, the particle migration being easily carried in stratum containing polymer in Produced Liquid, enters
One step aggravation blocking, affects the normal production in oil field.Therefore soil-well jam degree is monitored in real time, take in time to arrange accordingly
Executing, improving oil well liquid-producing ability is the important topic that polymer flooding faces.
Summary of the invention
For the problems referred to above, it is an object of the invention to provide and a kind of monitor in real time according to chocking-up degree near oil well
Polymer flooding effect and the reservoir evaluation methods of pollution radius.
A kind of method that present invention firstly provides monitoring polymer Flooding Efficiency, comprises the steps:
1) installing lubricator at the well head of oil well, (i.e. Y connects to transfer tool string salvaging Y type blanking plug in described oil well
Head) and be promoted in described lubricator；
2) rotation wellhead, under enter the tool string suitable with manometric diameter, length and quality and go into the well drifting；
3) open pump and produce (i.e. carrying out polymer flooding), until production fluid stable (i.e. stability of flow) afterwards termination of pumping closing well, utilize institute
State the piezometer of pump condition in oil well and carry out pressure buildup test, obtain the bottom pressure of oil well according to pressure testing results；
4) utilize Pressure Analysis model that the bottom pressure of described oil well is carried out pressure data analysis interpretation, obtain oil reservoir
Permeability；Described permeability is contrasted with the poly-permeability driving front oil reservoir, i.e. obtains the Flooding Efficiency of polymer.
In above-mentioned method, step 1) employed in tool string salvage shown in Y type blanking plug use, mainly include rope
Cap, weighted lever, universal joint, breechblock, bumper jar and centralizer, for different oil wells, the size of each building block is different.
Step 2) employed in tool string be that drifting is used, mainly include rope socket, weighted lever, universal joint, breechblock, jarring
Device and drift size gauge tool.
In above-mentioned method, step 3) in, the bottom pressure of described oil well is calculated according to formula (1):
pwf=ph+ρog(H-h)/1000000 (1)
In formula (1), pwfRepresent the bottom pressure of described oil well, MPa；phRepresent that pump condition tests the force value obtained,
MPa；ρoRepresent oil density in oil jacket annular space, kg/m3；G represents acceleration of gravity, m/s2；H represents that in oil reservoir, (ground is arrived deeply
The distance at the middle part of oil reservoir), m；H represents the pump condition degree of depth (distance of the degree of depth of pump condition to ground), m.
In above-mentioned method, step 4) in, utilize well test analysis software to carry out pressure data analysis interpretation, described well testing solution
Release software and include various Pressure Analysis model, as compound in double-deck channelling, three layers of channelling, double-deck channelling etc. analyze model.Select to close
The bottom pressure data of suitable Pressure Analysis models fitting actual measurement, just can obtain reservoir permeability, table according to fitting result
Skin coefficient, bottom-hole storage coefficient, strata pressure etc. explain parameter.
In above-mentioned method, step 4) in, contrast described permeability and the poly-permeability driving front oil reservoir according to formula (2),
In formula (2), R represents permeability variation value；K represents the poly-permeability driving front oil reservoir, um2；KPRepresent injection of polymer
The permeability obtained by bottom pressure data interpretation afterwards, um2；
R value is the biggest, shows that the blocking caused by polymer solution delay is the most serious, i.e. Flooding Efficiency is the poorest, can basis
Chocking-up degree i.e. R value size is follow-up takes corresponding breaking block treatment, improves Flooding Efficiency.
Invention further provides the assay method of a kind of polymer flooding pollution radius, comprise the steps:
First the bottom pressure of oil well is obtained according to the monitoring method of polymer flooding effect；Then Pressure Analysis mould is utilized
Type carries out pressure data analysis interpretation to the bottom pressure of described oil well, obtains the explanation parameter of oil reservoir, described explanation parameter bag
The permeability of oil scraper layer and skin factor；The pollution radius of polymer flooding is obtained according to described explanation parameter.
Described pollution radius can be obtained according to formula (3),
In formula (3), S represents skin factor；rwRepresent shaft bottom radius, m；rsRepresent pollution radius, m；K represents poly-and drives front oil
The permeability of layer, um2；KPThe permeability obtained by bottom pressure data interpretation after representing injection of polymer, um2。
Due to the fact that and take above technical scheme, it has the advantage that
1, the present invention directly utilizes pump condition and is monitored pressure, it is not necessary to remove piezometer, reduces task difficulty and work
Industry cost.
2, the present invention utilizes pump condition monitoring pressure in real time, it is simple to obtains the pressure build-up curve of any time, then leads to
Cross poly-WELL TEST INTERPRETATION MODEL of driving to obtain gathering the permeability after driving, during solving poly-driving, reservoir chocking-up degree can not be monitored in real time
A difficult problem.
3, the present invention can also obtain the parameter such as skin factor, bottom-hole storage coefficient by pressure interpretation, identifies further
Reservoir pollution degree, it is simple to take appropriate measures in time, improves oil well liquid-producing ability, improves polymer flooding effect.
Accompanying drawing explanation
Fig. 1 is the structural representation of the oil reservoir bottom pressure test of the present invention.
Fig. 2 is the well test curve match figure of Bohai Sea A oil field K well, t in figure in the embodiment of the present invention 1DWhen representing zero dimension
Between, CDRepresent zero dimension bottom-hole storage coefficient, PWDRepresent zero dimension pressure, PWD' represent dimensionless pressure derivative.
Detailed description of the invention
Experimental technique used in following embodiment if no special instructions, is conventional method.
Material used in following embodiment, reagent etc., if no special instructions, the most commercially obtain.
The Flooding Efficiency that embodiment 1, monitoring polymer drive
The present embodiment carries out the structural representation of oil reservoir bottom pressure test as shown in Figure 1.
1) well head (A oil field, Bohai Sea K well) installs lubricator, and lower tool string is salvaged Y and blocked up, after catching Y stifled on carry tool string extremely
In lubricator；
2) rotation wellhead, under enter the tool string suitable with piezometer diameter, length and quality and go into the well drifting；
3) open pump and produce (i.e. carrying out polymer flooding), termination of pumping closing well after production fluid is stable, utilize pump condition to carry piezometer
Carry out pressure buildup test, be completed, open production valve and back pressure valve, and be calculated well by equation below (1)
Bottom pressure:
pwf=ph+ρog(H-h)/1000000 (1)
In formula, pwfRepresent bottom pressure, MPa；phRepresent that pump condition tests the force value obtained, MPa；ρoRepresent oil jacket ring
Oil density in empty, kg/m3；G represents acceleration of gravity, m/s2；H represent in oil reservoir deep (middle part on ground to oil reservoir away from
From), m；H represents the pump condition degree of depth (distance of the degree of depth of pump condition to ground), m；
4) utilize polymer flooding Pressure Analysis model, each production layer is carried out bottom pressure data interpretation, obtains each substratum
Permeability.
A oil field, Bohai Sea K well starts note in November, 2010 and gathers, and according to the pressure measurement data on May 6th, 2012, uses poly-driving
Double-deck channelling composite model carries out well test analysis, and well test curve match figure is as in figure 2 it is shown, well test analysis each layer permeability is K1P=
0.72, K2P=0.14, before this well note is poly-, each layer permeability is K1=0.86, K2=0.38.
5) permeability gone out by comparative interpretation and the poly-relation driving front permeability, analyze reservoir stopping state, such as formula
(2), R value is the biggest, illustrates that the blocking caused by polymer solution delay is the most serious, and Flooding Efficiency is the poorest, can be according to blocking journey
Degree i.e. R value size is follow-up takes corresponding breaking block treatment, improves Flooding Efficiency:
In formula, R is permeability variation value；K drives front permeability for poly-, um2；KPFor passing through bottom pressure after injection of polymer
The permeability that data interpretation obtains, um2。
It is calculated R1=1.19, R2=2.71, show according to actual producing profile testing data, the Liquid output ratio of 2 substratums
Poly-drive before decline more, illustrate that 2 substratums blockings are more serious, explanation results is coincide with producing reality.
Embodiment 2, the mensuration of polymer flooding pollution radius
According to step 1 in embodiment 1)-3) obtain the bottom pressure of producing well, then utilize Pressure Analysis model (double-deck
Channelling composite model) carry out the formation effective permeability after pressure data explanation is blocked and skin factor, then according to formula
(3) Radius of Formation Damage Arround A Wellbore is calculated,
In formula (3), S represents skin factor；rwRepresent shaft bottom radius, m；rsRepresenting pollution radius, m, K ooze before representing poly-driving
Rate, um thoroughly2；KPThe permeability obtained by bottom pressure data interpretation after representing injection of polymer, um2,
Well test analysis obtains K1P=0.72, K2P=0.14, S1=1.21, S2=11.97, it is calculated rs1=50.41,
rs2=107.76.
The various embodiments described above are merely to illustrate the present invention, the structure of the most each parts, arrange position and connected mode etc. thereof
All can be varied from, every equivalents carried out on the basis of technical solution of the present invention and improvement, the most should not arrange
In addition in protection scope of the present invention.
Claims (8)
1. a method for monitoring polymer Flooding Efficiency, comprises the steps:
1) lubricator is installed at the well head of oil well, in described oil well, transfers tool string salvage Y type blanking plug and be promoted to institute
State in lubricator；
2) rotation wellhead, under enter the tool string suitable with manometric diameter, length and quality and go into the well drifting；
3) open pump to produce, termination of pumping closing well after production fluid is stable, utilize the piezometer of pump condition in described oil well to carry out pressure extensive
Repetition measurement tries, and obtains the bottom pressure of oil well according to pressure testing results；
4) utilize Pressure Analysis model that the bottom pressure of described oil well is carried out pressure data analysis interpretation, obtain the infiltration of oil reservoir
Rate；Described permeability is contrasted with the poly-permeability driving front oil reservoir, i.e. obtains the Flooding Efficiency of polymer.
Method the most according to claim 1, it is characterised in that: step 3) in, the bottom pressure of described oil well is according to formula (1)
It is calculated:
pwf=ph+ρog(H-h)/1000000 (1)
In formula (1), pwfRepresent the bottom pressure of described oil well, MPa；phRepresent that pump condition tests the force value obtained, MPa；ρoTable
Show oil density in oil jacket annular space, kg/m3；G represents acceleration of gravity, m/s2；H represents deep in oil reservoir, m；H represents pump condition
The degree of depth, m.
Method the most according to claim 1 and 2, it is characterised in that: step 4) in, utilize well test analysis software to carry out pressure
Data analysis is explained.
4. according to the method according to any one of claim 1-3, it is characterised in that: step 4) in, described according to formula (2) contrast
Permeability and the poly-permeability driving front oil reservoir,
In formula (2), R represents permeability variation value；K represents the poly-permeability driving front oil reservoir, um2；KPLead to after representing injection of polymer
Cross the permeability that bottom pressure data interpretation obtains, um2；
R value is the biggest, shows that the blocking caused by polymer solution delay is the most serious, i.e. Flooding Efficiency is the poorest.
5. an assay method for polymer flooding pollution radius, comprises the steps:
1) lubricator is installed at the well head of oil well, in described oil well, transfers tool string salvage Y type blanking plug and be promoted to institute
State in lubricator；
2) rotation wellhead, under enter the tool string suitable with manometric diameter, length and quality and go into the well drifting；
3) open pump to produce, termination of pumping closing well after production fluid is stable, utilize the piezometer of pump condition in described oil well to carry out pressure extensive
Repetition measurement tries, and obtains the bottom pressure of oil well according to pressure testing results；
4) utilize Pressure Analysis model that the bottom pressure of described oil well is carried out pressure data analysis interpretation, obtain the explanation of oil reservoir
Parameter, described explanation parameter includes permeability and the skin factor of oil reservoir；The dirt of polymer flooding is obtained according to described explanation parameter
Dye radius.
Assay method the most according to claim 5, it is characterised in that: step 3) in, the bottom pressure of described oil well according to
Formula (1) is calculated:
pwf=ph+ρog(H-h)/1000000 (1)
In formula (1), pwfRepresent the bottom pressure of described oil well, MPa；phRepresent that pump condition tests the force value obtained, MPa；ρoTable
Show oil density in oil jacket annular space, kg/m3；G represents acceleration of gravity, m/s2；H represents deep in oil reservoir, m；H represents pump condition
The degree of depth, m.
7. according to the assay method described in claim 5 or 6, it is characterised in that: step 4) in, utilize well test analysis software to carry out
Pressure data analysis interpretation.
8. according to the assay method according to any one of claim 5-7, it is characterised in that: step 4) in, obtain according to formula (3)
Described pollution radius,
In formula (3), S represents skin factor；rwRepresent shaft bottom radius, m；rsRepresent pollution radius, m；K represents poly-and drives front oil reservoir
Permeability, um2；KPThe permeability obtained by bottom pressure data interpretation after representing injection of polymer, um2。
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110454152A (en) * | 2019-08-12 | 2019-11-15 | 成都北方石油勘探开发技术有限公司 | The non-homogeneous injury skin factor calculation method of fracture-type reservoir |
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| US8960294B2 (en) * | 2011-08-05 | 2015-02-24 | Halliburton Energy Services, Inc. | Methods for monitoring fluids within or produced from a subterranean formation during fracturing operations using opticoanalytical devices |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110454152A (en) * | 2019-08-12 | 2019-11-15 | 成都北方石油勘探开发技术有限公司 | The non-homogeneous injury skin factor calculation method of fracture-type reservoir |
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Address after: 100010 Beijing, Chaoyangmen, North Street, No. 25, No. Applicant after: China Offshore Oil Group Co., Ltd. Applicant after: CNOOC research institute limited liability company Address before: 100010 Beijing, Chaoyangmen, North Street, No. 25, No. Applicant before: China National Offshore Oil Corporation Applicant before: CNOOC Research Institute |
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| GR01 | Patent grant |