CN103233726B - Experimental calibration method of saturation degree and water production rate logging evaluation model of water-flooded layer - Google Patents
Experimental calibration method of saturation degree and water production rate logging evaluation model of water-flooded layer Download PDFInfo
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Abstract
The invention provides an experimental calibration method. The method comprises utilizing an unsteady relative permeability and resistivity simultaneously-measuring mode (through oil layer water-flooding process simulation) to measure the water production rate, the saturation degree, the mixed-stratum water resistivity and the rock sample resistivity during an oil layer water-flooding process; determining experimental statistical relationships and key coefficients between the water production rate and the saturation degree, the water production rate and the mixed-stratum water resistivity (the mineralization degree), and the resistivity and the saturation rate through statistical regression; and serving the logging evaluation of the water production rate and the saturation rate of a water-flooded oil layer.
Description
Technical field
The invention belongs to expeimental physics measuring technology, relate to the experiment scale method of the experiment scale change in resistance mechanism of a kind of waterflooded reservoir saturation ratio, producing water ratio logging evaluation, can be directly used in the quantitative assessment of oil field Water Flooding Layer (fresh water water logging, salt water water logging) saturation ratio, producing water ratio.
Technical background
At present, the computation model of waterflooded reservoir producing water ratio is mainly to utilize permeability saturation curve to set up equation based on fractional flow equation, specifically uses water saturation that application of electrical measurement well often calculates waterflooded reservoir according to Archie formula to determine relative permeability.After reservoir water flooding, common rule is: water saturation increases, mixing formation water resistivity increases (fresh water water logging) or reduces (salty sewage water logging), producing water ratio rises, saturation exponent changes with water saturation, and changing appears dull decline (salty sewage water logging) or present non-monotonic (fresh water water loggings) such as " V " shape or serpentines in the resistivity of rock core.Research discovery, there is function or the experiment statistics relation between producing water ratio-saturation ratio, producing water ratio-mixing formation water resistivity (salinity), resistivity-saturation ratio in waterflooded reservoir, can be used for the logging evaluation of waterflooded reservoir producing water ratio, saturation ratio.
At present, limited by the level of understanding or experimental ability, the experiment measuring of relative permeability or waterflooded reservoir resistivity is often only carried out separately in different laboratories, and can not carry out Accurate Determining to mixing formation water resistivity in watering-out process, be difficult to set up function between the producing water ratio-saturation ratio, producing water ratio-mixing formation water resistivity (salinity), resistivity-saturation ratio of waterflooded reservoir or experiment statistics relation to meet the logging evaluation of waterflooded reservoir producing water ratio and saturation ratio.
Summary of the invention
The object of this invention is to provide a kind of waterflooded reservoir producing water ratio, the experiment scale method of saturation ratio Logging estimation model, take unstable state relative permeability (simulation waterflooded reservoir process) and the mode of resistivity translocation to measure the producing water ratio in reservoir water flooding process simultaneously, saturation ratio, mix formation water resistivity, rock sample resistivity, statistical regression is determined producing water ratio-saturation ratio, producing water ratio-mixing formation water resistivity (salinity), experiment statistics relation and key coefficient between resistivity-saturation ratio, serve the logging evaluation of waterflooded reservoir producing water ratio and saturation ratio.
This experiment scale method adopts unstable state water drive oil relative permeability and rock core resistivity translocation device, described device takes the mode of unstable state relative permeability and resistivity translocation to measure producing water ratio, saturation ratio, mixing formation water resistivity, the rock sample resistivity in reservoir water flooding process simultaneously, statistical regression is determined experiment statistics relation and the key coefficient between producing water ratio-saturation ratio, producing water ratio-mixing formation water resistivity, resistivity-saturation ratio, and described method specifically comprises the following steps:
1) measure full water sample resistivity and be designated as R
o, by obtaining cementation factor m after following formula (1) calculating formation factor F;
2) water sample of satisfying is placed in Hassler clamper, and oily expelling water, to irreducible water state, is determined irreducible water saturation Swi;
3) measure oil phase effective permeability under irreducible water state, METHOD FOR CONTINUOUS DETERMINATION three times, relative error is less than 3%;
4) according to " two-phase relative permeability assay method in SY/T5345-2007 rock ", water drive oil displacement initial pressure is set;
5) start displacement test, record experimental period simultaneously, record liquid outlet quantity, oil pump capacity, these experiment parameters of displacement pressure;
6) in the water breakthrough point moment, the port of export has the moment of water droplet, accurate recording water breakthrough time, oil pump capacity;
7) occur after water breakthrough point, every fuel-displaced 0.2ml, gather and mix stratum water sample once, after collected specimens, experiment suspends, and stops timing, after resistivity is stable, measure rock sample resistivity, the producing water ratio of experiment with computing sample, oil productivity during this time, does water-oil separating processing to the mixing stratum water sample gathering, and isolated saline solution is doubled to dilute rear measurement mixing formation water resistivity;
8) graduated cylinder of replacing collection liquid, recovers experiment, continues timing, when producing water ratio is less than 4 times of oil productivity, and repeating step 7);
9), in the time that producing water ratio is greater than 4 times of oil productivity, adjusting the sampling interval is that every fluid 20ml gathers mixed liquor sample 1ml.After collected specimens, experiment suspends, stop timing, after resistivity is stable, measure rock sample resistivity, the parameter such as producing water ratio, oil productivity of experiment with computing sample during this time, the mixing stratum water sample gathering is done to water-oil separating processing, isolated saline solution is doubled to dilute rear measurement mixing formation water resistivity;
10), in the time that fluid moisture content reaches 99.95% or after filling liquid volume is 30 times of voids volumes, displacement test finishes, measure the water phase permeability under residual oil;
11), by data processing, finally can obtain moisture content, oil (water) the relative permeability experiment statistics relation with water saturation;
12) observation producing water ratio and mixing formation water resistivity statistics are set up experiment statistics relation;
13) observation rock sample resistivity, mixing formation water resistivity and water saturation are determined saturation exponent.
Wherein, the experimental technique of mixing formation water resistivity (salinity) is even more important.On the one hand, need to set up and the experiment statistics relation of producing water ratio with its, thereby permeability saturation curve and resistivity logging are combined; On the other hand, also need to use it to investigate the variation of saturation exponent with water flooded grade (with producing water ratio or oil displacement efficiency index sign and division).About the experimental measurement method that mixes formation water resistivity (salinity) in watering-out process belongs to state of the art, discuss no longer in detail herein.
Brief description of the drawings
Fig. 1 shows unstable state water drive oil relative permeability and rock core resistivity translocation device;
Fig. 2 shows and mixes formation water resistivity measurement mechanism figure;
Fig. 3 shows the experiment scale method flow chart according to waterflooded reservoir producing water ratio of the present invention, saturation ratio Logging estimation model;
Fig. 4 shows according to GD Cut of Oilfield of the present invention and water saturation cross plot;
Fig. 5 shows according to GD of the present invention oil field mixing formation water resistivity and moisture content cross plot;
Fig. 6 shows according to GD of the present invention oil field resistance Magnification and saturation ratio cross plot;
Fig. 7 shows according to DX Cut of Oilfield of the present invention and water saturation cross plot;
Fig. 8 shows according to DX of the present invention oil field mixing formation water resistivity and moisture content cross plot;
Fig. 9 shows according to DX of the present invention oil field resistance Magnification and saturation ratio cross plot.
Detailed description of the invention
Describe technology of the present invention and feature below in conjunction with accompanying drawing in detail by embodiment, but these embodiment are not intended to limit protection scope of the present invention.
Embodiment 1
Taking the rock core in GD oil field as example, reservoir prime stratum water salinity is 3000mg/L, and injected water salinity is 14000mg/L, carries out experiment measuring after sampling, and concrete operation step is as follows:
1) measure full water sample resistivity and be designated as R
0, by obtaining cementation factor m after following formula (1) calculating formation factor F.
2) will satisfy water sample oil expelling water to irreducible water state, determine irreducible water saturation Swi.
3) measure oil phase effective permeability under irreducible water state, METHOD FOR CONTINUOUS DETERMINATION three times, relative error is less than 3%.
4) connect experimental facilities according to the device schematic diagram shown in Fig. 1.According to " two-phase relative permeability assay method in SY/T5345-2007 rock ", displacement initial pressure is set.
5) start displacement test, record experimental period simultaneously, record liquid outlet quantity, the experiment parameter such as oil pump capacity, displacement pressure.
6) in water breakthrough point moment (port of export has water droplet), accurate recording water breakthrough time, oil pump capacity.
7) occur after water breakthrough point that every fuel-displaced 0.2ml gathers and mixes stratum water sample once.After collected specimens, experiment suspends, and stops timing, after resistivity is stable, measures rock sample resistivity.The parameter such as producing water ratio, oil productivity of experiment with computing sample during this time, does water-oil separating processing to the mixing stratum water sample gathering, and isolated saline solution is doubled to dilute rear measurement mixing formation water resistivity.
8) graduated cylinder of replacing collection liquid, recovers experiment, continues timing, when 4 times of oil productivity of producing water ratio <, and repeating step 7).
9), in the time of 4 times of oil productivity of producing water ratio >, adjusting the sampling interval is that every fluid 20ml gathers mixed liquor sample 1ml.After collected specimens, experiment suspends, and stops timing, after resistivity is stable, measures rock sample resistivity.The parameter such as producing water ratio, oil productivity of experiment with computing sample during this time, does water-oil separating processing to the mixing stratum water sample gathering, and isolated saline solution is doubled to dilute rear measurement mixing formation water resistivity.
10), in the time that fluid moisture content reaches 99.95% or after filling liquid volume is 30 times of voids volumes, displacement test finishes, measure the water phase permeability under residual oil.
11) experimental data is carried out data processing with reference to national standard " two-phase relative permeability assay method in SY/T5345-2007 rock ", finally can obtain moisture content, oil (water) relative permeability is related to f with the experiment statistics of water saturation
w=f (S
w).In this example, experiment statistics pass is f
w=0.5488ln (Sw)+1.1219, coefficient is R
2=0.87 (seeing Fig. 4).
12) set up experiment statistics relation by experimental observation producing water ratio and mixing formation water resistivity statistics, form is R
w=f (f
w).In this example, experiment statistics pass is R
w=1.1537f
w 2-2.4326f
w+ 1.8215, coefficient is R
2=0.95 (seeing Fig. 5).
13) determine saturation exponent by experimental observation rock sample resistivity, mixing formation water resistivity and water saturation, set up experiment statistics relation by experimental observation producing water ratio and saturation exponent, form is n=f (f
w).In this example, producing water ratio and saturation exponent are uncorrelated, determine that saturation exponent is 1.61 (seeing Fig. 6).Saturation exponent is determined method:
Embodiment 2
DX oilfield reservoir prime stratum water salinity is 4200mg/L, and injected water salinity is 10000mg/L, chooses rock core and carries out experiment measuring, and concrete operation step is identical with example 1, and Data Processing in Experiment is with example 1.Finally obtaining moisture content is f with the experiment statistics pass of water saturation
w=0.4868ln (Sw)+1.0856, coefficient is R
2=0.96 (seeing Fig. 7).It is R that experimental observation producing water ratio and mixing formation water resistivity are set up statistical relationship
w=0.7137f
w 2-1.5902f
w+ 1.466, coefficient is R
2=0.97 (seeing Fig. 8).Experimental observation rock sample resistivity, mixing formation water resistivity and water saturation and saturation exponent, determine that saturation exponent is 1.65 (seeing Fig. 9).
The foregoing is only embodiments of the invention, not in order to limit the present invention, all any amendments of making within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Reference numeral:
1, constant speed and constant pressure pump;
2, fluid line;
3, intermediate receptacle;
4, pressure meter;
5, Hassler clamper;
6, intelligent LCR measuring;
7, power lead;
8, valve;
9, graduated cylinder some (5ml or 10ml);
11, intelligent LCR measuring;
12, power lead;
13, salt solution clamper.
Claims (1)
1. an experiment scale method, for waterflooded reservoir producing water ratio, the experiment scale of saturation ratio Logging estimation model, it is characterized in that, the method adopts unstable state water drive oil relative permeability and rock core resistivity translocation device, described device takes the mode of unstable state relative permeability and resistivity translocation to measure the producing water ratio in reservoir water flooding process simultaneously, saturation ratio, mix formation water resistivity, rock sample resistivity, statistical regression is determined producing water ratio-saturation ratio, producing water ratio-mixing formation water resistivity, experiment statistics relation and key coefficient between resistivity-saturation ratio, described method specifically comprises the following steps:
1) measure full water sample resistivity and be designated as R
o, by obtaining cementation factor m after following formula (1) calculating formation factor F;
（1）
2) water sample of satisfying is placed in Hassler clamper, and oily expelling water, to irreducible water state, is determined irreducible water saturation;
3) measure oil phase effective permeability under irreducible water state, METHOD FOR CONTINUOUS DETERMINATION three times, relative error is less than 3%;
4) according to " two-phase relative permeability assay method in SY/T5345-2007 rock ", water drive oil displacement initial pressure is set;
5) start displacement test, record experimental period simultaneously, record liquid outlet quantity, oil pump capacity, these experiment parameters of displacement pressure;
6) in the water breakthrough point moment, the port of export has the moment of water droplet, accurate recording water breakthrough time, oil pump capacity;
7) occur after water breakthrough point, every fuel-displaced 0.2ml, gather and mix stratum water sample once, after collected specimens, experiment suspends, and stops timing, after resistivity is stable, measure rock sample resistivity, the producing water ratio of experiment with computing sample, oil productivity during this time, does water-oil separating processing to the mixing stratum water sample gathering, and isolated saline solution is doubled to dilute rear measurement mixing formation water resistivity;
8) graduated cylinder of replacing collection liquid, recovers experiment, continues timing, when producing water ratio is less than 4 times of oil productivity, and repeating step 7);
9) in the time that producing water ratio is greater than 4 times of oil productivity, adjusting the sampling interval is that every fluid 20ml gathers mixed liquor sample 1ml, after collected specimens, experiment suspends, stop timing, after resistivity is stable, measure rock sample resistivity, the producing water ratio of experiment with computing sample, oil productivity parameter during this time, the mixing stratum water sample gathering is done to water-oil separating processing, isolated saline solution is doubled to dilute rear measurement mixing formation water resistivity;
10), in the time that fluid moisture content reaches 99.95% or after filling liquid volume is 30 times of voids volumes, displacement test finishes, measure the water phase permeability under residual oil;
11), by data processing, finally can obtain moisture content, oil and water relative permeability and close with the experiment statistics of water saturation and be
;
12) observation producing water ratio and mix formation water resistivity statistics and set up experiment statistics and close and be
;
13) observation rock sample resistivity, mixing formation water resistivity and water saturation determine that saturation exponent is 1.61, and wherein said saturation exponent passes through
determine.
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| CN104100263B (en) * | 2013-10-29 | 2017-01-25 | 中国石油化工股份有限公司 | Method for determining residual oil saturation of non-uniform water flooded layer |
| CN103867195A (en) * | 2014-03-05 | 2014-06-18 | 中国海洋石油总公司 | Quantitative evaluation method of water production rate of low permeability reservoir |
| CN105784567B (en) * | 2016-04-28 | 2018-08-10 | 中国石油天然气股份有限公司 | Equipment and method for testing relative permeability of rock core |
| CN106323835B (en) * | 2016-08-04 | 2019-04-09 | 中国石油天然气股份有限公司 | Method for determining cementing index of heterogeneous carbonate reservoir |
| CN108301826B (en) * | 2018-01-25 | 2021-05-11 | 中国海洋石油集团有限公司 | Method for predicting oil reservoir indexes in high-salinity oil reservoir development process |
| CN109753755B (en) * | 2019-01-25 | 2023-12-01 | 中国石油天然气集团有限公司 | Method for determining water saturation of reservoir |
| CN110160932B (en) * | 2019-06-03 | 2023-12-15 | 西南石油大学 | Oil-water relative permeability curve testing device and testing method |
| CN110702491B (en) * | 2019-11-11 | 2022-02-01 | 西南石油大学 | Method for determining water salinity and rock core salt washing degree of water-containing salt-soluble stratum |
| CN114427454B (en) * | 2020-09-09 | 2024-05-31 | 中国石油化工股份有限公司 | True formation resistivity correction method for reservoir with large influence of mud invasion |
| CN112983411B (en) * | 2021-03-09 | 2021-11-26 | 中国石油大学(华东) | Method for estimating mixed liquor resistivity by using inspection well data |
| CN113029908B (en) * | 2021-03-16 | 2021-11-26 | 中国石油大学(华东) | Laboratory measurement method for compact reservoir saturation index |
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