CN103233730A - Experimental measurement method for resistivity of mixed stratum water in rock core displacement process - Google Patents
Experimental measurement method for resistivity of mixed stratum water in rock core displacement process Download PDFInfo
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Abstract
The invention provides an experimental measurement method for resistivity of mixed stratum water in a rock core displacement process. The resistivity of the mixed stratum water in the rock core displacement process is obtained by utilizing relative permeability and resistivity co-measurement device and utilizing mixed stratum water discrete sampling and proportion dilution and resistivity measurement method measurement. According to the mixed stratum water discrete sampling, a measuring cylinder is adopted to obtain oil-water mixed liquid samples by discretization and a centrifugation method is adopted to separate oil-water so as to calculate an oil outflow volume and water outflow volume by accumulation; according to the proportion dilution and resistivity measurement, distilled water is added into the centrifugally purified mixed stratum water according to some proportion to enable the volume of the mixed stratum water to be large enough so as to meet the requirements of an electrolyte solution resistivity measurement device measuring the resistivity, and then the resistivity is converted into the resistivity prior to dilution so as to finally determine the resistivity of the mixed stratum water. Through the experimental measurement method, the shortcomings in an existing measurement device are overcome, and the resistivity of the mixed stratum water is obtained by accurate measurement.
Description
Affiliated technical field
The invention belongs to the expeimental physics measuring technology, relate to a kind of experimental measurement method that in rock core water drive oil process, mixes formation water resistivity.
Technical background
At secondary phase of oil production, can inject fresh water, salty sewage to keep stratum energy to oil-gas Layer during field produces, the result of water filling can cause reservoir water flooding and its resistivity is changed.For can the qualitative identification of application of electrical measurement well data and quantitative assessment Water Flooding Layer, the laboratory often adopts the mode of water drive oil that the plunger rock sample is carried out the change mechanism research of Water Flooding Layer resistivity, and emphasis is to investigate Water Flooding Layer resistivity with producing water ratio (corresponding water logging stage), water saturation, the isoparametric Changing Pattern of mixing formation water resistivity.
At present, the experimental facilities that the research of Water Flooding Layer resistivity response mechanism is adopted is equivalent to relative permeability and resistivity translocation device, and referring to Fig. 1, measuring process is equivalent to combine in the relative permeability based measurement measurement of plunger sample resistivity.Wherein: the metering of water saturation, producing water ratio and plunger sample resistivity realizes than being easier to, but just is difficult for realizing as the experiment measuring of the mixing formation water resistivity of one of plunger sample resistivity effects factor.At first, be difficult for obtaining interference-free mixing formation water water sample.Main cause is when adopting existing apparatus to carry out experiment, displacement begins initial condition before the mixing formation water of back-plunger sample inside and the displacement (for water-oil separating and accurately metering producing water ratio and saturation ratio, the prime stratum water that need keep certain volume in the oil water separator of displacement port of export the inside) and the displacement formation water of discharging communicate, the mixing formation water water sample that in the water-oil separating pipe, directly extracts with inject water volume (the voids volume multiple of using rock sample always defines), producing water ratio, resistivity can not be corresponding well.Be to measure to mix relatively difficulty of resistivity of water on the other hand, main cause is that the mixing water volume (1ml at most) of the discharge of (particularly early stage) corresponding a certain producing water ratio, resistivity in the displacement process is limited, is difficult to satisfy the needs of mixing water resistivity measurement.
At present, the laboratory is still untapped goes out the experimental measurement method that mixes formation water resistivity in a kind of rock core displacement process.Owing to can not accurately measure the mixing formation water resistivity in the watering-out process, be difficult to the quantitative expedition water logging to the influence of mixing water resistivity and the Water Flooding Layer resistivity Changing Pattern with water saturation, greatly influenced the order of accuarcy of the qualitative identification of application of electrical measurement well data and quantitative assessment Water Flooding Layer.
Summary of the invention
The objective of the invention is to provide on the basis that does not influence relative permeability and resistivity measurement the experimental measurement method of mixing formation water resistivity in a kind of rock core displacement process.
Concrete design philosophy is to do technological improvement on the basis of existing relative permeability and resistivity translocation apparatus and method, uses " mixing the formation water discrete sampling " and " dilution proportion and resistivity measurement " method and come experiment measuring to obtain mixing formation water resistivity in the rock core displacement process under the prerequisite that does not influence parameter measurements such as producing water ratio, relative permeability, resistivity, saturation ratio.Wherein: " it is discrete to mix formation water " sampling no longer adopts the oil water separator of usual means shown in Figure 1 and balance " continuously " to measure oil volume and water outlet volume, be aided with centrifugal method separation profit and come cummulative metering to go out oil volume and water outlet volume part but adopt graduated cylinder " disperse " to obtain the oil-water mixture sample, referring to Fig. 2, thereby realize that " disperse " extract the purpose of the mixing stratum water sample corresponding with injecting volume, producing water ratio, plunger sample resistivity, can effectively avoid the interference of the formation water of the preceding initial condition of displacement and the discharge of displacement in advance; " dilution proportion and resistivity measurement " is to add distilled water in a certain ratio to the mixing formation water of centrifugal purification to make its volume enough greatly satisfying the needs of electrolyte solution resistivity test device measured resistivity, and then the resistivity that is converted into before the dilution is determined the mixing formation water resistivity with final.Above-mentioned technology path can overcome the drawback that existing measurement mechanism exists, and accurately measures to mix the stratum resistivity of water.
Be implemented as follows:
At first, change oil volume, water outlet volume metering mechanism and method of measurement and purify to mix the stratum water sample, this be the inventive method be achieved basic.Specific implementation is: 1) shorten the length of rock core port of export pipeline, to reduce residual liquid in the port of export pipeline dead volume to the interference that mixes formation water and to going out the measure error of oil volume and water outlet volume as far as possible; 2) do not re-use oil water separator and electronic balance and measure oil volume and water outlet volume, change into and use one group of precision " to disperse " as the 0.025mL graduated cylinder to collect profit; 3) adopt centrifugal method to separate profit and obtain mixing the stratum water sample with the go out oil volume and water outlet volume and purification that obtains sometime.
Secondly, use distilled water that the mixing stratum water sample that different time obtains is diluted to the measurement requirement that can satisfy the salt solution resistivity test device, use measurement device shown in Figure 3 to obtain diluting the back and mix the stratum resistivity of water.
At last, obtain diluting the preceding stratum resistivity of water that mixes according to the dilution ratio inverse.
Description of drawings
Fig. 1 shows the Experimental equipment that present Water Flooding Layer resistivity response mechanism research is adopted;
Fig. 2 shows relative permeability according to an embodiment of the invention and resistivity translocation setting drawing;
Fig. 3 is the salt solution resistivity test device figure of prior art;
Fig. 4 is the experimental measurement method flow chart of rock core displacement test resistivity of mixed according to one embodiment of present invention.
The specific embodiment
Describe technology of the present invention and characteristics below in conjunction with accompanying drawing in detail by embodiment, but these embodiment are not for limiting protection scope of the present invention.
The experiment measuring that mixes formation water resistivity in the rock core displacement process in example 1:GD oil field
1
#The rock core underlying parameter is L=49.18mm; D=24.97mm; Φ=34.89%; K=1086mD.According to beginning experiment measuring behind the device schematic diagram connection experimental facilities shown in Figure 2, operating procedure is as follows:
(1) the water sample rock core of will satisfying is inserted Hassler clamper oil and is driven prime stratum water (3000mg/l) to the irreducible water state, determines that irreducible water saturation is 26.1%, and measuring formation water resistance is 1.88 Ω m (room temperature is 22 ℃ during measurement);
(2) measure oil phase effective permeability under the irreducible water state, three results of METHOD FOR CONTINUOUS DETERMINATION are 299.80mD, 299.98mD, 298.06mD, and relative error meets the requirement of standard " two-phase relative permeability assay method in the SY/T5345-2007 rock " less than 3%;
(3) fluid line between replacing intermediate receptacle and intermediate receptacle and the Hassler clamper, change and use salinity to begin displacement test as the salt solution of 14000mg/l, and use graduated cylinder to collect the profit liquid of discharging, record experiment parameters such as experimental period, liquid outlet quantity, oil pump capacity, displacement pressure simultaneously;
(4) in (port of export is seen water droplet) time-out experiment constantly of water breakthrough point, stop timing, accurate recording water breakthrough time, oil pump capacity;
(5) graduated cylinder of replacing collection liquid is gathered the mixed liquor sample once about every fuel-displaced 0.2ml.After sample was gathered, experiment suspended, and stops timing.With centrifuge the mixed liquor sample of gathering is done water-oil separating and handle, parameters such as the producing water ratio of experiment with computing sample, oil productivity are extracted certain volume V
1(ml) mixing formation water sample.
(6) the mixing formation water after will separating with distilled water diluting to certain volume V
2(ml), measure its resistance r (Ω) at a certain temperature with salt solution resistivity test device shown in Figure 3, utilize calibrated curve electrode coefficient k (resistance r and resistivity R at a certain temperature calculates k=R/r by normal solution) will mix formation water resistance r and be converted into resistivity R, utilize Schlumberger formula (formula 1) to calculate the salinity C of dilution back solution
W2, again according to formula C
1=V
2* C
W2/ V
1Mix formation water salinity C before calculating dilution
1(before and after dilution, the principle that the solion sum is constant) back is calculated and is mixed stratum resistivity of water R under the uniform temperature according to the Schlumberger formula
Wz
In the formula, C
WzBe salt water salinity, mg/L; R
WzBe resistivity of mixed, Ω m;
(7) graduated cylinder of replacing collection liquid restarts experiment and continues timing.In the experimentation, during times oil productivity of producing water ratio＜4, repeating step 5)-6);
(8) when times oil productivity of producing water ratio＞4, adjusting the sampling interval is to gather mixed liquor sample 1ml about every fluid 20ml.After the collected specimens, experiment suspends, and stops timing.Parameters such as the producing water ratio of calculation sample, oil productivity are done water-oil separating to the sample of gathering and are handled during this time, and to isolated saline solution measured resistivity;
(9) when the fluid moisture content reaches 99.95% or after injecting liquid volume and being 30 times of voids volumes, displacement test finishes, and measures the water phase permeability under the residual oil;
(10) experimental data is carried out the data processing with reference to industry standard " two-phase relative permeability assay method in the SY/T5345-2007 rock ", finally can obtain moisture content, oil (water) relative permeability with the Changing Pattern of water saturation, parameters (seeing Table 1) such as the moisture content when the simultaneously corresponding sampling time can be determined collected specimens and water saturation.
Table 1 GD oil field 1
#Rock core mixing formation water resistivity experimental measurements (22 ℃)
Illustrate: before the displacement, mixing formation water is prime stratum water; Experiment is last, because " salinize " of water mixes formation water and become injection water.
The experiment measuring that mixes formation water resistivity in the rock core displacement process in example 2:DB oil field
2
#The rock core underlying parameter is L=46.61mm; D=24.71mm; Φ=24.89%; K=141mD.According to beginning experiment measuring behind the device schematic diagram connection experimental facilities shown in Figure 2, the concrete operations step is as follows:
(1) the water sample rock core of will satisfying is inserted Hassler clamper oil and is driven prime stratum water (3000mg/l) to the irreducible water state, determines that irreducible water saturation is 35.5%, and measuring formation water resistance is 1.83 Ω m (room temperature is 23 ℃ during measurement);
(2) measure oil phase effective permeability under the irreducible water state, three results of METHOD FOR CONTINUOUS DETERMINATION are 163.68mD, 159.85mD, 160.57mD, and relative error meets the requirement of standard " two-phase relative permeability assay method in the SY/T5345-2007 rock " less than 3%;
The residue experimental procedure is identical with example 1, and experimental measurements sees Table 2.
Table 2 DB oil field 2
#Rock core mixing formation water resistivity experimental measurements (23 ℃)
Illustrate: before the displacement, mixing formation water is prime stratum water; Experiment is last, because " salinize " of water mixes formation water and become injection water.
The above only is embodiments of the invention, not in order to limiting the present invention, all any modifications of making within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within 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, oil water separator
10, electronic balance
11, constant speed and constant pressure pump;
12, fluid line;
13, intermediate receptacle;
14, pressure meter;
15, Hassler clamper;
16, intelligent LCR measuring;
17, power lead;
18, valve;
19, graduated cylinder some (5ml or 10ml);
20, intelligent LCR measuring;
21, power lead;
22, salt solution clamper
Claims (3)
1. the experimental measurement method that mixes formation water resistivity in the rock core displacement process, mix formation water resistivity by utilizing relative permeability and resistivity translocation device to adopt mixing formation water discrete sampling and dilution proportion and resistivity measurement method to measure in the rock core displacement process, it is characterized in that:
Described mixing formation water discrete sampling is adopted graduated cylinder disperse to obtain the oil-water mixture sample to be aided with centrifugal method separation profit to come cummulative metering to go out oil volume and water outlet volume part, described dilution proportion and resistivity measurement are to add distilled water in a certain ratio to the mixing formation water of centrifugal purification to make its volume enough greatly satisfying the needs of electrolyte solution resistivity test device measured resistivity, and then the resistivity that is converted into before the dilution is determined the mixing formation water resistivity with final.
2. according to the method for claim 1, described method further comprises:
At first, change oil volume, water outlet volume metering mechanism and method of measurement and purify to mix the stratum water sample, the specific implementation step comprises:
1) shortens the length of rock core port of export pipeline, to reduce residual liquid in the port of export pipeline dead volume to the interference that mixes formation water and to going out the measure error of oil volume and water outlet volume;
2) use one group of precision " to disperse " as the 0.025mL graduated cylinder and collect profit;
3) adopt centrifugal method to separate profit and obtain mixing the stratum water sample with the go out oil volume and water outlet volume and purification that obtains sometime;
Secondly, use distilled water that the mixing stratum water sample that different time obtains is diluted to the measurement requirement that can satisfy the salt solution resistivity test device;
At last, obtain diluting the preceding stratum resistivity of water that mixes according to the dilution ratio inverse.
3. mix the experimental measurement method of formation water resistivity in the rock core displacement process, it is characterized in that may further comprise the steps:
(1) the water sample rock core of will satisfying is inserted Hassler clamper oil and is driven prime stratum water to the irreducible water state;
(2) measure oil phase effective permeability under the irreducible water state;
(3) fluid line between replacing intermediate receptacle and intermediate receptacle and the Hassler clamper, change and use mineralising salt solution to begin displacement test, and use graduated cylinder to collect the profit liquid of discharging, record experimental period, liquid outlet quantity, oil pump capacity, these experiment parameters of displacement pressure simultaneously;
(4) suspend experiment constantly at water breakthrough point, stop timing, accurate recording water breakthrough time, oil pump capacity;
(5) graduated cylinder of replacing collection liquid is gathered the mixed liquor sample once about every fuel-displaced 0.2ml;
(6) the mixing formation water after will separating with distilled water diluting to certain volume;
(7) graduated cylinder of replacing collection liquid restarts experiment and continues timing;
(8) when times oil productivity of producing water ratio＞4, adjusting the sampling interval is to gather mixed liquor sample 1ml about every fluid 20ml;
(9) when the fluid moisture content reaches 99.95% or after injecting liquid volume and being 30 times of voids volumes, displacement test finishes, and measures the water phase permeability under the residual oil;
(10) experimental data is carried out the data processing with reference to industry standard " two-phase relative permeability assay method in the SY/T5345-2007 rock ".
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| CN103670393A (en) * | 2013-12-31 | 2014-03-26 | 中国海洋石油总公司 | Method for measuring stratum water producing rate |
| CN105784567A (en) * | 2016-04-28 | 2016-07-20 | 中国石油天然气股份有限公司 | Equipment and method for testing relative permeability of rock cores |
| CN106442269A (en) * | 2016-10-28 | 2017-02-22 | 西南石油大学 | Method for filtrating invariable cores used for laboratory physical simulation experiment |
| CN106970014A (en) * | 2017-03-20 | 2017-07-21 | 西南石油大学 | A kind of automatic measurement calculates the displacement method of testing of rock core physical parameter |
| CN107063964A (en) * | 2017-03-20 | 2017-08-18 | 西南石油大学 | A kind of automatic measurement calculates the driving device of rock core physical parameter |
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| CN103670393A (en) * | 2013-12-31 | 2014-03-26 | 中国海洋石油总公司 | Method for measuring stratum water producing rate |
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| CN106442269A (en) * | 2016-10-28 | 2017-02-22 | 西南石油大学 | Method for filtrating invariable cores used for laboratory physical simulation experiment |
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| CN109254134A (en) * | 2017-07-12 | 2019-01-22 | 北京康普瑞基石油工程技术有限公司 | A kind of new method and equipment measuring Rock resistivity Indication of Oil-Gas breakthrough pressure |
| CN109254134B (en) * | 2017-07-12 | 2021-12-31 | 北京康普瑞基石油工程技术有限公司 | Novel method and equipment for measuring rock resistance and indicating oil gas breakthrough pressure |
| CN112782477A (en) * | 2019-11-11 | 2021-05-11 | 中国石油化工股份有限公司 | Method and system for measuring electrical response characteristics of rock core in different wetting states |
| CN112360443A (en) * | 2020-08-19 | 2021-02-12 | 中国石油天然气股份有限公司 | Flooding level evaluation method based on rock resistance change rate and phase permeation coupling |
| CN112360443B (en) * | 2020-08-19 | 2023-08-22 | 中国石油天然气股份有限公司 | Water flooding level evaluation method based on rock resistivity change rate and phase-seepage coupling |
| CN112096357A (en) * | 2020-09-16 | 2020-12-18 | 中国石油大学(北京) | Oil production amount correction method, device and equipment for testing relative permeability of heavy oil thermal recovery |
| CN112858397A (en) * | 2021-01-11 | 2021-05-28 | 中国海洋石油集团有限公司 | Method for measuring crude oil saturation in formation fluid |
| CN112983411A (en) * | 2021-03-09 | 2021-06-18 | 中国石油大学(华东) | Method for estimating mixed liquor resistivity by using inspection well data |
| CN113092337A (en) * | 2021-04-08 | 2021-07-09 | 西南石油大学 | Method for establishing initial water saturation of compact rock core under in-situ condition |
| CN113092337B (en) * | 2021-04-08 | 2022-01-28 | 西南石油大学 | Method for establishing initial water saturation of compact rock core under in-situ condition |
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