CN111474093A - Technical evaluation method of crude oil demulsifier - Google Patents
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- 238000011156 evaluation Methods 0.000 title claims abstract description 63
- 239000010779 crude oil Substances 0.000 title claims abstract description 48
- 230000018044 dehydration Effects 0.000 claims abstract description 98
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 98
- 239000003921 oil Substances 0.000 claims abstract description 86
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 37
- 238000000034 method Methods 0.000 claims abstract description 33
- 239000010865 sewage Substances 0.000 claims abstract description 32
- 239000003814 drug Substances 0.000 claims abstract description 25
- 239000007788 liquid Substances 0.000 claims abstract description 25
- 238000012360 testing method Methods 0.000 claims description 26
- 238000012544 monitoring process Methods 0.000 claims description 21
- 239000000295 fuel oil Substances 0.000 claims description 11
- 239000000839 emulsion Substances 0.000 claims description 9
- 239000002351 wastewater Substances 0.000 claims description 9
- 239000012530 fluid Substances 0.000 claims description 7
- 229940079593 drug Drugs 0.000 claims description 3
- 208000005156 Dehydration Diseases 0.000 description 78
- 239000000523 sample Substances 0.000 description 58
- 238000004519 manufacturing process Methods 0.000 description 13
- 230000000694 effects Effects 0.000 description 12
- 238000013077 scoring method Methods 0.000 description 12
- 238000004062 sedimentation Methods 0.000 description 8
- 239000003795 chemical substances by application Substances 0.000 description 5
- 239000000126 substance Substances 0.000 description 4
- 238000010998 test method Methods 0.000 description 4
- 230000009897 systematic effect Effects 0.000 description 3
- 239000013043 chemical agent Substances 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 230000001804 emulsifying effect Effects 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
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- 238000011020 pilot scale process Methods 0.000 description 1
- 238000011158 quantitative evaluation Methods 0.000 description 1
- 239000013074 reference sample Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/04—Investigating sedimentation of particle suspensions
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
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- C10G33/00—Dewatering or demulsification of hydrocarbon oils
- C10G33/04—Dewatering or demulsification of hydrocarbon oils with chemical means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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Abstract
The invention provides a technical evaluation method of a crude oil demulsifier, wherein the method comprises the following steps: (1) obtaining the dehydration rate of the sample, and calculating a dehydration rate score according to the weight value; (2) obtaining the oil content of the sewage of the sample, and calculating the oil content of the sewage according to the weight value; (3) obtaining the dehydration rate of the sample, and calculating a dehydration rate score according to the weight value; (4) obtaining an oil-water interface condition score of the sample; (5) acquiring single liquid amount medicament consumption of the sample, and calculating a single liquid amount medicament consumption score according to the weight value; (6) and (4) calculating a total score according to a percentage by using the results obtained in the steps (1) to (5).
Description
Technical Field
The invention relates to the field of oil exploitation, in particular to a technical evaluation method of a crude oil demulsifier.
Background
As the development of Liaohe oil field enters the middle and later stages, the water content of each main power oil area is over 80 percent generally. The main reason is that in order to keep the stable yield of crude oil, the properties of produced liquid are greatly changed by adopting various yield increasing measures, and the difficulty of dehydration treatment of the crude oil in the produced liquid is increased; the cost of crude oil treatment agents and sewage treatment agents in the fluctuation period is increased. In the actual production, the contradiction between the treatment effect of the crude oil demulsifier and the cost of single-component liquid is difficult to accept, and the weight relationship between the demulsification and dehydration of the crude oil and the sewage treatment brings a series of troubles to the production management of oil fields. The crude oil demulsifier plays an important role in the production of a ground gathering and transportation system as a main chemical agent for the dehydration treatment of crude oil, and an industrial standard 'crude oil demulsifier general technical condition' SY/T5280 is formulated at home at present, wherein the main contents of the standard comprise a general condition, product physical and chemical indexes and a test method, the standard focuses on the standardization and unification of an indoor test method, and the actual combination degree with the oil field production is low. The published reports mostly evaluate the effect and performance of single agent and analyze the effect of tests, and the optimization and evaluation of the joint participation of multiple products have no mature and feasible systematic technical rules. Therefore, the method for evaluating the systematicness of quantitatively optimizing a plurality of crude oil demulsifier products based on the weight relationship between the crude oil demulsification and dehydration effect and the single fluid amount cost, the crude oil demulsification and dehydration effect and the sewage treatment effect is not available in various domestic oil fields at present.
Disclosure of Invention
Aiming at the problem that a systematic technical evaluation method which takes the crude oil demulsifier into consideration and has the crude oil treatment effect, the sewage treatment effect, the single liquid amount cost and the like is lacked in various oil fields in China at present, a systematic technical system for evaluating the crude oil demulsifier is constructed through continuous research and practice.
In order to achieve the purpose, the invention provides a technical evaluation method of a crude oil demulsifier, wherein the method comprises the following steps:
(1) obtaining the dehydration rate of the sample, and calculating a dehydration rate score according to the weight value;
(2) obtaining the oil content of the sewage of the sample, and calculating the oil content of the sewage according to the weight value;
(3) obtaining the dehydration rate of the sample, and calculating a dehydration rate score according to the weight value;
(4) obtaining an oil-water interface condition score of the sample;
(5) acquiring single liquid amount medicament consumption of the sample, and calculating a single liquid amount medicament consumption score according to the weight value;
(6) and (4) calculating a total score according to a percentage by using the results obtained in the steps (1) to (5).
Wherein, the sample obtained by the steps (1) to (5) is the sample obtained after the thermochemical settling dehydration treatment of the crude oil added with the crude oil demulsifier.
Firstly, the technical evaluation requirements of the chemical agent on the oil field surface are standardized, wherein in order to reflect the rapidity of indoor evaluation requirements, provide pilot-scale test basis for oil field production in time and meet the operability of actual production conditions, the settling time and the monitoring time point of indoor dehydration tests of thin oil, thick oil, extra-thick oil and super-thick oil are specified according to different oil properties; and determining evaluation test parameters such as dosing concentration, temperature and the like by combining a production field. In order to evaluate and preferably select a high-efficiency crude oil demulsifier with quick and good relative dehydration effect, the dehydration rate, the interface condition and the oil content in the sewage are determined as evaluation items, and the 'dehydration rate' is increased as an evaluation item; meanwhile, in order to better combine the production practice and achieve the purpose of saving cost, the single liquid amount medicament consumption is determined as an evaluation item. Secondly, factors such as crude oil treatment effect, sewage treatment effect, single-fluid liquid amount cost and the like are systematically weighed, each evaluation item adopts a weight coefficient distribution method, and the optimized evaluation is carried out in a mode of carrying out quantitative scoring on each evaluation item.
According to some embodiments of the present invention, the weight of the dehydration rate is 35, the weight of the oil content of the wastewater is 15, the weight of the dehydration rate is 5, and the weight of the single liquid dosage consumption is 40.
According to some embodiments of the present invention, the steps (1) to (3) and (5) are respectively obtained by multiplying the obtained dehydration rate, wastewater oil content, dehydration rate and single liquid dosage consumption by corresponding weight values, so as to obtain corresponding scores.
According to some specific embodiments of the present invention, in the step (6), the scores obtained in each of the steps (1) to (5) are added to obtain a total score.
According to some embodiments of the present invention, the method comprises obtaining the dehydration amount of the sample at different monitoring points of the evaluation time, and further obtaining the dehydration rate, the oil content of the wastewater and the dehydration rate.
According to some specific embodiments of the invention, the method comprises:
(1) obtaining the dehydration amount of the sample at monitoring points at different evaluation times;
(2) obtaining the dehydration rate of the sample, and calculating a dehydration rate score according to the weight value;
(3) obtaining the oil content of the sewage of the sample, and calculating the oil content of the sewage according to the weight value;
(4) obtaining the dehydration rate of the sample, and calculating a dehydration rate score according to the weight value;
(5) obtaining an oil-water interface condition score of the sample;
(6) acquiring single liquid amount medicament consumption of the sample, and calculating a single liquid amount medicament consumption score according to the weight value;
(7) and (4) calculating a total score according to a percentage by using the results obtained in the steps (1) to (5).
According to some embodiments of the invention, step (1) comprises obtaining the amount of dehydration of the sample at different evaluation time monitoring points and determining the amount of dehydration at the inflection point of the sample.
Wherein, it can be understood that the dehydration amount, the dehydration rate, the sewage oil content and the dehydration rate of the sample are the dehydration amount, the dehydration rate, the sewage oil content and the dehydration rate of the sample after being added with the chemicals.
Wherein, it can be understood that the dehydration amount at the inflection point of the sample refers to the dehydration amount at the inflection point after the sample is added with the chemicals.
Inflection point definition: when the crude oil emulsion is subjected to demulsification dehydration sedimentation, the point when the dehydration amount is changed from an accelerated increase to a gradual and slow increase along with the extension of the dehydration time is called an inflection point. The inflection point can be determined by one skilled in the art from the change in the amount of dewatering monitored at different times.
According to some embodiments of the present invention, wherein step (1) comprises calculating the dehydration rate using the following formula,
in the formula: rai-the dehydration rate of the ith sample;
Vaithe ith sample settled to final (read) dewatering after dosing, m L;
Vq-Water content of the sample (measured) before dosing, m L.
Wherein, it is understood that the deposition of the ith sample to the final dehydration amount after adding the reagent is the dehydration amount read at the last monitoring point (i.e. the last observation).
The step (2) comprises the following steps of calculating the oil content of the sewage by using the following formula:
in the formula: n is the number of samples;
Rbithe ith sample is added with medicine and then is settled to the final (measured) oil content of the sewage, wherein i is less than or equal to n;
Cnall samples were dosed and settled to the sum of the final (measured) oil contents of the wastewater, mg/L;
Cithe ith sample was dosed and settled to the final (measured) oil content of the wastewater, mg/L.
According to some embodiments of the invention, step (3) comprises calculating the dehydration rate using the following equation:
in the formula: rci-the ith sample dehydration rate;
Vgithe amount of (read) dewatering at the ith sample post-dose inflection point, m L;
Vqwater content of the sample (measured) before dosing, m L.
According to some embodiments of the present invention, the oil-water interface condition scoring criteria in step (4) includes: the oil-water interface is clear at 5 minutes, the oil-water interface is fuzzy at 3 minutes, and the oil-water interface has an emulsion layer at 1 minute.
According to some embodiments of the invention, step (5) comprises calculating the unilateral fluid consumption using the following formula:
Yi＝Mi×Pi
in the formula: n-number of samples;
Rdi-the cost of the reagent is consumed by the single liquid amount of the ith sample, i is less than or equal to n;
Mi-the i-th sample addition in kg/m3；
Pi-the ith sample price, dollar/kg;
Yiunilateral cost consumption of the ith sample, unit/m3；
YnSum of cost of single liquid amounts of all samples, unit/m3。
According to some specific embodiments of the invention, the monitoring points of the thin oil evaluation time are 15min, 30min, 60min, 90min and 120 min; the monitoring points of the common thick oil evaluation time are 15min, 30min, 60min, 120min, 150min and 240 min; the monitoring points of the evaluation time of the heavy oil doped with extra heavy oil and super heavy oil are 0.5h, 1h, 3h, 5h, 8h and 12 h; the monitoring points of the evaluation time of the extra-thick oil and the super-thick oil are 6h, 12h, 24h, 36h, 48h and 72 h.
According to some embodiments of the present invention, the sample preparation and thermochemical settling dehydration test methods are performed according to SY/T5280 "general technical conditions for crude oil demulsifiers" 7.1, 7.2 and 7.3.
According to some embodiments of the invention, the dehydration settling time of the crude oil demulsifier is: the thin oil is 60-120min, the common thick oil is 120-240 min, the thick oil mixed with extra thick oil and super thick oil is 12h, and the extra thick oil and super thick oil are 48-72 h.
According to some embodiments of the invention, the number of replicates per test sample being evaluated is three and the index results are averaged.
According to some embodiments of the invention, the sample collection method is performed according to the specifications of GB/T6680 and GB/T2828.1.
Specifically, the method of the invention comprises the following steps:
1. the technical requirements are as follows:
the preparation of the crude oil demulsifier indoor evaluation sample and the thermochemical settling dehydration test method are carried out according to SY/T5280 general technical conditions for crude oil demulsifiers 7.1, 7.2 and 7.3. The technical evaluation items of the crude oil demulsifier include dehydration rate, sewage oil content, dehydration rate, oil-water interface condition and single-fluid-quantity medicament consumption. The evaluation test parameters of the crude oil demulsifier dosing concentration, the indoor test dehydration temperature and the like are executed according to the field parameters confirmed by the relevant production management departments. Indoor dehydration and sedimentation time of a crude oil demulsifier: the thin oil is 60-120min, the common thick oil is 120-240 min, the thick oil mixed with extra thick oil and super thick oil is 12h, and the extra thick oil and super thick oil are 48-72 h. In order to determine the inflection point in the dehydration speed index evaluation, the monitoring points of the thin oil evaluation time are 15min, 30min, 60min, 90min and 120 min; the monitoring points of the common thick oil evaluation time are 15min, 30min, 60min, 120min, 150min and 240 min; the monitoring points of the evaluation time of the heavy oil doped with extra heavy oil and super heavy oil are 0.5h, 1h, 3h, 5h, 8h and 12 h; the monitoring points of the evaluation time of the extra-thick oil and the super-thick oil are 6h, 12h, 24h, 36h, 48h and 72 h.
2. The evaluation technical method comprises the following steps:
the total score evaluation of the crude oil demulsifier is the sum of the score values of all evaluation items; the number of the parallel samples in each evaluation sample test is three, and the index result is taken as the average value.
Grading standard: the evaluation items are scored in percentage, wherein the weight coefficients of the scores are 35 points of dehydration rate, 15 points of oil content in sewage, 5 points of dehydration rate, 5 points of oil-water interface condition and 40 points of single liquid amount medicament consumption.
The score calculation method comprises the following steps:
(1) the dehydration rate scoring method comprises the following steps:
in the formula: rasi-a dewatering rate score for the ith sample;
Vai-settling of the ith sample after dosing to the final read amount of dewatering, m L;
Vqwater content measured on the specimen before dosing, m L.
(2) The sewage oil content scoring method comprises the following steps:
in the formula: n is the number of samples;
Rbsithe ith sample is added with medicine and then is settled to the final measured oil content score of the sewage, wherein i is less than or equal to n;
Cnall samples are settled after adding medicines until the sum of the oil contents of the finally measured sewage is mg/L;
Cithe ith sample was dosed and settled to the final measured oil content of the wastewater, mg/L.
(3) The dehydration rate scoring method comprises the following steps:
in the formula: rcsi-an ith sample dehydration rate score;
Vgi-the amount of dehydration read at the inflection point after the ith sample was dosed, m L;
Vqwater content measured on the specimen before dosing, m L.
(4) Oil-water interface evaluation condition scoring method (table 1):
TABLE 1 oil-water interface status score
| Oil-water interface condition | Score value |
| Clear and clear | 5 |
| Fuzzy (with bubble or lace) | 3 |
| With an emulsifying layer | 1 |
(5) A single liquid amount medicament consumption scoring method comprises the following steps:
Yi＝Mi×Pi
in the formula: n-number of samples;
Rdsi-the cost consumption score of the medicament in the single liquid amount of the ith sample, wherein i is less than or equal to n;
Mi-the i-th sample addition in kg/m3；
Pi-the ith sample price, dollar/kg;
Yiunilateral cost consumption of the ith sample, unit/m3；
YnSum of cost of single liquid amounts of all samples, unit/m3。
3. Basic principles and methods for sample collection
The related professional department personnel establish a joint sampling group to organize and supervise the on-site sample collection work.
The drug samples to be evaluated were uniformly registered by the panelists, uniformly numbered, using uniform sample bottles (white, 250ml wide-mouthed ground bottles), uniformly labeled, kept by a specialist (samples were in duplicate, one sample was used as the test sample to be evaluated, and the other was sealed and kept for future reference).
The sample collection method is carried out according to the regulations of GB/T6680 and GB/T2828.1.
It is understood that the above embodiments can be combined with each other arbitrarily without any inconsistency.
In conclusion, the invention provides a technical evaluation method of a crude oil demulsifier. The method of the invention has the following advantages:
the invention realizes the optimization of the crude oil demulsifier, realizes the systematization, scientification, standardization and operability of evaluation work, and provides scientific decision basis for oil field production application and new products of crude oil demulsifiers for pilot test.
Detailed Description
The following detailed description is provided for the purpose of illustrating the embodiments and the advantageous effects thereof, and is not intended to limit the scope of the present disclosure.
Example 1
The technical evaluation example of the crude oil demulsifier of the united station of the Liaohe oil field oil extraction plant is explained, the test parameters comprise dehydration temperature and dosing concentration, the parameters are determined and provided by an on-site production department, the crude oil of the united station belongs to the heavy oil doped part of extra heavy oil, and the monitoring points of the sedimentation time are set to be 0.5h, 1h, 3h, 5h, 8h and 12h according to the technical evaluation method of the invention; three reference demulsifier samples were numbered 1-P, 2-P, and 3-P as specified in the methods, and each reference sample contained 3 replicates (see Table 2).
Table 2 evaluation test raw record table
Dehydration temperature: the chemical concentration of demulsifier at 85 ℃ is as follows: 150mg/l
Note that 100m L crude oil emulsion before dosing had a water content of 24m L.
The evaluation test shows that 100m L of the uniformly mixed aqueous crude oil emulsion taken by the united station is poured into 9 colorimetric tubes respectively, and 3 parallel samples of evaluation crude oil demulsifiers with the numbers of 1-P, 2-P and 3-P are added respectively, and the test results originally recorded by the evaluation test are obtained after thermochemical sedimentation for 12h, and quantitative evaluation of the following evaluation items is carried out.
1. The dehydration rate scoring method comprises the following steps:
according to the test record in Table 2, the average value of the final dehydration amounts of three parallel samples of 21m L, 23m L and 22m L after the crude oil emulsion sample added with the 1-P crude oil demulsifier is settled for 12 hours is 22m L, the water content of the crude oil emulsion in 100m L in the sample before adding the crude oil emulsion is 24m L, the dehydration rate is 22 ÷ 24 × 100% ~ 91.7%, and the score R isas1-P91.7% × 35 ═ 32.1, and so on Ras2-P20/27 × 100% × 35/27.3 points, Ras3-p21 ÷ 24 × 100% × 35 ═ 30.6 minutes.
2. The method for scoring the oil content of the sewage comprises the following steps:
the oil content and the dehydration rate of the sewage are different evaluation items taken in the same test process.
According to the test record in Table 2, C3The sum of the oil contents 201+212+207 of the finally removed sewage after the three evaluation demulsifier samples are demulsified and dehydrated is 620 mg/L, C1-PThe oil content of finally removed sewage is 201 mg/L after demulsification and dehydration of demulsifier with the reference number of 1-P, Rbs1-P620 + 620 × 15-10.1, and so onbs2-P9.9 points; rbs3-P10.0 min.
3. The dehydration rate scoring method comprises the following steps:
the dehydration rate and the dehydration rate are different evaluation items taken in the same test process.
According to the test record in Table 2, Vg1-PThe dehydration amount of three parallel samples is 18.7m L of the average value of the dehydration amount of 18m L, 19m L and 19m L when the demulsification, dehydration and sedimentation monitoring is carried out for 3 hours by using a demulsifying agent with the reference number of 1-P, and VqFor the water content of the sample before adding the medicine of 24m L, R is obtained according to the formula of the sewage oil content scoring methodcs1-P3.9 points; by analogy with Rcs2-P2.9 points; rcs3-P3.7 points.
4. Oil-water interface evaluation condition scoring method (table 3):
TABLE 3
| Oil-water interface condition | Score value |
| Clear and clear | 5 |
| Fuzzy (with bubble or lace) | 3 |
| With an emulsifying layer | 1 |
The oil-water interface and the dehydration rate are different evaluation items taken in the same test process.
According to the test records in the table 2, the oil-water interface condition is clear after demulsification, dehydration and sedimentation by the demulsifier with the reference number of 1-P, and 5 points are obtained according to the oil-water interface condition scoring method; by analogy, the oil-water interface condition of the demulsifier with the reference number 2-P is 1 point for 2ml of an emulsion layer after demulsification, dehydration and sedimentation, the oil-water interface condition of the demulsifier with the reference number 3-P is clear after demulsification, dehydration and sedimentation, and the oil-water interface condition is 5 points according to the oil-water interface condition scoring method.
5. A single liquid amount medicament consumption scoring method comprises the following steps:
Yi＝Mi×Pi
according to the test record in Table 2, the dosage of the three demulsifiers is 0.15kg/m3The price of the demulsifier with the reference number of 1-P is 0.85 ten thousand yuan/ton, the price of the demulsifier with the reference number of 2-P is 0.83 ten thousand yuan/ton, and the price of the demulsifier with the reference number of 3-P is 0.87 ten thousand yuan/ton. Y is10.15 × 0.85 ═ 0.1275 yuan/m3By analogy with Y20.1245 yuan/m3，Y30.1305 yuan/m3。Yn＝Y1+Y2+Y3(0.3825, 1-P demulsifier Final Single fluid amount) agent consumption score Rds1-P26.7 points, and so on for Rds2-PNot more than 27.0 min, Rds3-P26.4 points.
The sum of the scores obtained by three demulsifier sample dehydration rates, sewage oil contents, dehydration rates, oil-water interface condition evaluation items and single-fluid solution amount medicament consumption obtained by evaluation tests is respectively shown in table 4:
table 4 evaluation scoring table for three crude oil demulsifiers
And quantitatively evaluating the three demulsifiers under evaluation according to the obtained scores from high to low, so that the longitudinal evaluation score of each project can be obtained, and the system comprehensive evaluation of the sum of all the projects can also be obtained. The method for evaluating the crude oil demulsifier with the systematicness can provide data support for pilot test of a production field and preferable medicaments when production indexes fluctuate.
Claims (12)
1. A method for evaluating a crude oil demulsifier technology, wherein the method comprises the following steps:
(1) obtaining the dehydration rate of the sample, and calculating a dehydration rate score according to the weight value;
(2) obtaining the oil content of the sewage of the sample, and calculating the oil content of the sewage according to the weight value;
(3) obtaining the dehydration rate of the sample, and calculating a dehydration rate score according to the weight value;
(4) obtaining an oil-water interface condition score of the sample;
(5) acquiring single liquid amount medicament consumption of the sample, and calculating a single liquid amount medicament consumption score according to the weight value;
(6) and (4) calculating a total score according to a percentage by using the results obtained in the steps (1) to (5).
2. The method of claim 1, wherein the dehydration rate weight is 35, the wastewater oil content weight is 15, the dehydration rate weight is 5, and the single fluid dosage consumption weight is 40.
3. The method of claim 1 or 2, wherein the method comprises obtaining the dehydration amount of the sample at different evaluation time monitoring points and then obtaining the dehydration rate, the wastewater oil content and the dehydration rate.
4. The method of claim 3, wherein the method comprises obtaining the amount of dehydration of the sample at different evaluation time monitoring points and determining the amount of dehydration at the inflection point of the sample.
5. The method according to any one of claims 1 to 4, wherein the step (1) comprises calculating the dehydration rate using the following formula;
in the formula: rai-the dehydration rate of the ith sample;
Vaithe ith sample was dosed and settled toFinal dewatering amount, m L;
vq-water content of the sample before dosing, m L.
6. The method according to any one of claims 1 to 4, wherein the step (2) comprises calculating the oil content of the wastewater by using the following formula:
in the formula: n is the number of samples;
Rbithe ith sample is added with medicine and then is settled to the final oil content of sewage, wherein i is less than or equal to n;
Cnall samples are settled to the sum of the oil contents of the final sewage after adding medicines, namely mg/L;
Cithe ith sample is added with medicine and then settled to the final oil content of sewage, mg/L.
7. The method of any one of claims 1 to 4, wherein step (3) comprises calculating the dehydration rate using the formula:
in the formula: rci-the ith sample dehydration rate;
Vgi-the amount of dewatering at the inflection point after the ith sample was dosed, m L;
Vqwater content of the sample before dosing, m L.
8. The method according to any one of claims 1 to 4, wherein the oil-water interface condition scoring criterion in the step (4) comprises: the oil-water interface is clear at 5 minutes, the oil-water interface is fuzzy at 3 minutes, and the oil-water interface has an emulsion layer at 1 minute.
9. The method according to any one of claims 1 to 4, wherein step (5) comprises calculating the unilateral fluid volume consumption using the formula:
Yi＝Mi×Pi
in the formula: n-number of samples;
the cost of the medicament in the single liquid amount of the Rdi-ith sample is consumed, i is less than or equal to n;
dosage of Mi-ith sample in kg/m3；
Pi-ith sample price, yuan/kg;
yi-the ith sample is one-sided in cost consumption, yuan/m3；
Yn-sum of cost of single liquid amounts of all samples, Yu/m3。
10. The method of claim 3 or 4, wherein the thin oil evaluation time monitoring points are 15min, 30min, 60min, 90min, 120 min; the monitoring points of the common thick oil evaluation time are 15min, 30min, 60min, 120min, 150min and 240 min; the monitoring points of the evaluation time of the heavy oil doped with extra heavy oil and super heavy oil are 0.5h, 1h, 3h, 5h, 8h and 12 h; the monitoring points of the evaluation time of the extra-thick oil and the super-thick oil are 6h, 12h, 24h, 36h, 48h and 72 h.
11. The method of any one of claims 1 to 10, wherein the settling time for the dehydration of the crude oil demulsifier is: the thin oil is 60-120min, the common thick oil is 120-240 min, the thick oil mixed with extra thick oil and super thick oil is 12h, and the extra thick oil and super thick oil are 48-72 h.
12. The method according to any one of claims 1 to 11, wherein the number of replicates per test sample to be evaluated is three and the index results are averaged.
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| CN113341065A (en) * | 2021-04-26 | 2021-09-03 | 中国石油天然气集团有限公司 | Pre-dehydrating agent technical evaluation method |
| CN113238011B (en) * | 2021-04-26 | 2023-09-26 | 中国石油天然气集团有限公司 | Method for evaluating compatibility of chemicals and crude oil demulsification and dehydration medicament |
| CN113341065B (en) * | 2021-04-26 | 2023-11-28 | 中国石油天然气集团有限公司 | Pre-dehydrating agent technology evaluation method |
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