CN111077052B - Performance evaluation device and method for oil field water injection filtering material - Google Patents
Performance evaluation device and method for oil field water injection filtering material Download PDFInfo
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- 239000000463 material Substances 0.000 title claims abstract description 187
- 238000001914 filtration Methods 0.000 title claims abstract description 176
- 238000011156 evaluation Methods 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 20
- 239000002332 oil field water Substances 0.000 title claims abstract description 20
- 238000002347 injection Methods 0.000 title claims abstract description 18
- 239000007924 injection Substances 0.000 title claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 203
- 238000011001 backwashing Methods 0.000 claims abstract description 89
- 239000007788 liquid Substances 0.000 claims abstract description 18
- 230000008929 regeneration Effects 0.000 claims description 37
- 238000011069 regeneration method Methods 0.000 claims description 37
- 239000002245 particle Substances 0.000 claims description 18
- 239000010865 sewage Substances 0.000 claims description 16
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 15
- 239000006004 Quartz sand Substances 0.000 claims description 12
- 238000005070 sampling Methods 0.000 claims description 12
- 238000005259 measurement Methods 0.000 claims description 6
- 238000002835 absorbance Methods 0.000 claims description 4
- 239000008399 tap water Substances 0.000 claims description 4
- 235000020679 tap water Nutrition 0.000 claims description 4
- 230000001133 acceleration Effects 0.000 claims description 3
- 239000004576 sand Substances 0.000 claims description 3
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 3
- 239000002351 wastewater Substances 0.000 claims 1
- 238000005457 optimization Methods 0.000 abstract description 3
- 230000009897 systematic effect Effects 0.000 abstract description 3
- 241000758789 Juglans Species 0.000 description 9
- 235000009496 Juglans regia Nutrition 0.000 description 9
- 239000002223 garnet Substances 0.000 description 9
- 235000020234 walnut Nutrition 0.000 description 9
- 238000003756 stirring Methods 0.000 description 6
- 238000011068 loading method Methods 0.000 description 3
- 238000011282 treatment Methods 0.000 description 3
- 239000003344 environmental pollutant Substances 0.000 description 2
- 238000011010 flushing procedure Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033558 biomineral tissue development Effects 0.000 description 1
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- 238000005516 engineering process 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
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Abstract
The invention belongs to the technical field of equipment for an oil field water injection system, and particularly relates to a performance evaluation device and method for an oil field water injection filtering material. The device comprises a raw water barrel, a liquid level sensor, a stirrer, a raw water pump, a filtering water inlet valve, a first pressure gauge, a filtering column, a filtering water outlet valve, a backwashing water inlet valve, a second pressure gauge, a backwashing water outlet valve, a backwashing pump and a clear water barrel. A liquid level sensor is arranged in the raw water barrel, a stirrer is arranged at the upper end of the raw water barrel, a filtering water inlet valve and a first pressure gauge are sequentially connected between the raw water pump and the inlet of the filtering column, a back washing water outlet valve is arranged at the inlet of the top of the filtering column, and the back washing water inlet valve, the back washing pump and the clear water barrel are sequentially communicated. The invention can carry out systematic evaluation on the oil field water injection filtering material, has the advantages of simple operation and accurate and reliable result, and provides a theoretical basis for the optimization of the oil field water injection filtering material.
Description
Technical Field
The invention belongs to the technical field of equipment for an oil field water injection system, and particularly relates to a performance evaluation device and method for an oil field water injection filtering material.
Background
At present, most oil and gas fields in China are in the later development stage, a large amount of oil-containing and miscellaneous sewage is generated in the production process, and the sewage is treated and reinjected into the stratum, so that the stratum pressure can be kept, the productivity can be maintained, a good cycle of injection-production balance is formed, a large amount of water resources can be saved, the emission is reduced, and the environment is protected. However, oil field flooding has strict requirements on water quality, and injected water can enter a stratum only after a series of treatments reach a certain standard. The filtering treatment technology is an important link in sewage treatment, and mainly achieves the purpose of removing pollutants by utilizing the interception of the filtering material on petroleum suspended matters. The performance of the filter material determines the quality of the filtered water. At present, no unified evaluation method for the performance of the oilfield flooding filter material exists in China, so that the establishment of the performance evaluation method for the oilfield flooding filter material is very important for the optimization of the filter material.
The oil field sewage has complex components, high mineralization, impurity content, oil content, polymer content, large dosage and strong pollution. According to the recommended water quality index of water injection of the clastic rock oil reservoir in SYT 5329-2012, the oil field water injection filtering material mainly considers the performances of filtering, regeneration, pollution resistance, easy backwashing and the like. The filtering performance and the regeneration performance of the filter material are two most important indexes for evaluating the filter material, and the filtering performance of the filter material comprises SS removing performance and oil removing performance.
Through literature search, Gamet and Rademacher have proposed the following evaluation indexes in the evaluation of the filtering performance of the filtering material:
in the formula: v-filtration rate (m/h); t-filtration period (h); h-head loss at the end of the filtration cycle (m);
(1) the larger the value I is, the better the filtering performance is, although the filtering speed, the head loss and the filtering period are adopted to measure the performance of the filtering material in the filtering tank, the filtering material does not contain the influence of water quality factors, so that the performance of the filtering material cannot be comprehensively reflected.
Cleasby has proposed using the following formula to measure the filtration performance of a filter material:
in the formula: λ -the filtration coefficient; sigma-unit filter layer pollutant interception amount; Δ H — the amount of head loss increase at the end of the filtration cycle.
(2) The filtering performance is measured by the interception capacity of the filtering layer and the net increase of the head loss in the formula, the method is scientific, but the method is difficult to directly measure, and the influence of the filtering period is not considered in the formula, so that the method is difficult to be applied to practice.
Ives has proposed the following formula based on formula (1) to measure the filtration performance of a filter:
in the formula: c-average effluent turbidity during filtration; c0-average influent turbidity during filtration; v is the filtration speed (m/h); t-filtration period (h); h-head loss at the end of the filtration cycle (m).
(3) Although the formula considers the influence of water quality, in the filtering process, the effluent turbidity constantly changes every moment in the whole filtering process, and the average value of the effluent turbidity is difficult to calculate.
In evaluating the regeneration performance of a filter material, the regeneration performance of the filter material is generally evaluated in the industry by calculating the time t required for discharging 90% of the trapped suspended matters90The regeneration performance of the filter material is evaluated, and the method only considers the influence factors such as density, granularity, thickness and the like, but cannot distinguish the regeneration performance of the filter materials with different materials and different surface characteristics.
Disclosure of Invention
The invention provides a device and a method for evaluating the performance of a filter material for oilfield flooding aiming at the defects of the prior art; the standardized evaluation method can be used for systematically evaluating different oilfield flooding filtering materials, and has the advantages of simple operation and accurate and reliable result.
The invention discloses a device for evaluating the performance of a filtering material for oilfield water injection, which comprises a raw water barrel 1, a liquid level sensor 2, a stirrer 3, a raw water pump 4, a filtering water inlet valve 5, a first pressure gauge 6, a filtering column 7, a filtering water outlet valve 8, a backwashing water inlet valve 9, a second pressure gauge 10, a backwashing water outlet valve 11, a backwashing pump 12 and a clear water barrel 13; a liquid level sensor 2 is arranged in the raw water barrel 1; the upper end of the raw water barrel 1 is provided with a stirrer 3; a filtering water inlet valve 5 and a first pressure gauge 6 are sequentially connected between the raw water pump 4 and the inlet of the filter column 7; a back-flushing water outlet valve 11 is arranged at the top inlet of the filter column; a second pressure gauge 10 is arranged at the outlet at the bottom of the filter column, and a filtering water outlet valve 8 and a backwashing water inlet valve 9 are respectively arranged at the outlet at the bottom of the filter column in two paths; the backwash water inlet valve 9, the backwash pump 12 and the clear water barrel 13 are communicated in sequence.
The invention also discloses a performance evaluation method of the oil field water injection filtering material, which comprises the following steps:
(1) determination of evaluation conditions
The filtering speed is 9.5-10.5 ml/min, the SS concentration of the SS-containing filtered raw water is 90-110mg/L, the oil content of the oil-containing filtered raw water is 90-110mg/L, and the temperature is room temperature.
(2) Selection of filter material
The particle size of the filtering material is 16-20 meshes, the particle size is 0.8-1.2mm, and the thickness of the filtering layer is 0.7-1.2 m;
the filtering material comprises electrostatic sand, quartz sand and carborundum.
(3) Evaluation of SS-removing Properties of Filter Material
A. Under the temperature condition, the filter material is loaded into the filter column 7, the liquid level sensor 2 is opened, the filter raw water with the concentration of SS is added into the raw water barrel 1, the water is added to 900mL at 800-;
B. opening the filtering water inlet valve 5 and the filtering water outlet valve 8; closing the back washing water inlet valve 9 and the back washing water outlet valve 11; the raw water pump 4 is started, the filtering speed is the filtering speed, and the filtering material starts to filter;
C. and (3) sampling after filtering for 7-8h, measuring turbidity of filtered water by using a turbidity meter, converting a relation curve to obtain SS concentration X of filtered water, and dividing SS removing performance grade of the filtering material according to the value of the X value.
If X is less than or equal to 5mg/L, the SS removing performance of the filter material is I grade;
if X is more than 5mg/L and less than or equal to 10mg/L, the SS removing performance of the filter material is level II;
if X is more than 10mg/L and less than or equal to 15mg/L, the SS removing performance of the filter material is grade III;
if X is more than 15mg/L and less than or equal to 20mg/L, the SS removing performance of the filter material is IV grade;
if X is more than 20mg/L and less than or equal to 30mg/L, the SS removing performance of the filter material is V grade;
if X is more than 30mg/L, the SS removing performance of the filter material is poor.
(4) Evaluation of oil removing Performance of Filter Material
A. Under the temperature condition, the filter material is put into the filter column 7, the liquid level sensor 2 is opened, the filter raw water with the oil concentration is added into the raw water barrel 1, the water is added to 800mL plus 700-;
B. opening the filtering water inlet valve 5 and the filtering water outlet valve 8; closing the back washing water inlet valve 9 and the back washing water outlet valve 11; the raw water pump 4 is started, the filtering speed is the filtering speed, and the filtering material starts to filter;
C. and filtering for 7-8h, then sampling to obtain the oil-containing concentration Y of the filtered water, measuring the absorbance of the oil-containing concentration Y by a spectrophotometer, then converting by a relation curve, and dividing the oil removal performance grade of the filtering material according to the value of the Y.
If Y is less than or equal to 20mg/L, the oil removal performance of the filter material is grade I;
if Y is more than 20mg/L and less than or equal to 25mg/L, the oil removal performance of the filter material is level II;
if Y is more than 25mg/L and less than or equal to 30mg/L, the oil removal performance of the filter material is grade III;
if Y is more than 30mg/L and less than or equal to 35mg/L, the oil removal performance of the filter material is IV grade;
if Y is more than 35mg/L and less than or equal to 40mg/L, the oil removal performance of the filter material is V-level;
if Y is more than 40mg/L, the oil removal performance of the filter material is poor.
(5) Evaluation of regeneration Performance of Filter Material
A. Under the temperature condition, a filter material is filled into a filter column 7, a liquid level sensor 2 is opened, the filter raw water with the oil concentration is added into a raw water barrel 1, water is added to 800mL of 700-;
B. opening the filtering water inlet valve 5 and the filtering water outlet valve 8; closing the back washing water inlet valve 9 and the back washing water outlet valve 11; the raw water pump 4 is started, the filtering speed is the filtering speed, and the filtering material starts to filter;
C. after filtering for 7-8h, injecting 1-2L of tap water into the clear water barrel 13;
D. opening a backwashing water inlet valve 9 and a backwashing water outlet valve 11, and closing a filtering water inlet valve 5 and a filtering water outlet valve 8;
E. the backwashing pump 12 is opened, the filtering material starts backwashing, and the optimal backwashing strength of the filtering material is measured;
F. after backwashing the filtering material for 10-20min, sampling from a backwashing water outlet every 2min, measuring the turbidity of backwashing sewage, and calculating the product I of the average turbidity of the backwashing sewage and the optimal backwashing strength; and classifying the regeneration performance grade of the filter material according to the I value.
If I is less than or equal to 1, the regeneration performance of the filter material is grade I;
if I is more than 1 and less than or equal to 1.5, the regeneration performance of the filter material is grade II;
if I is more than 1.5 and less than or equal to 2, the regeneration performance of the filter material is grade III;
if I is more than 2 and less than or equal to 2.5, the regeneration performance of the filter material is IV grade;
if I is more than 2.5 and less than or equal to 3, the regeneration performance of the filter material is grade V;
if I > 3, the filter material has poor regeneration properties.
The optimal backwashing strength is calculated according to the following formula:
uB＝ut/10
in the formula: u. ofBThe optimal backwashing strength is m/s;
utmeans the settling velocity of a single filter material particle, m/s;
ρSmeans the density of the filter material, kg/m3；
ρFMeans the density of water, kg/m3；
g is gravitational acceleration, m/s2；
Mu means the viscosity of water at room temperature, mPa · s;
d is the filter particle size, m.
The average turbidity of the backwash sewage is calculated according to the following formula:
wherein n is 5;
τi1means that the 2i minute sample is taken for the first measurement of turbidity value;
τi2the second measurement of turbidity value is taken at the 2i minute;
τi3means that the sample is taken at the 2i minute and the turbidity value is measured for the third time.
Compared with the prior art, the invention has the following advantages and beneficial effects:
(1) the invention adopts a standardized evaluation method, can carry out systematic evaluation on different oilfield flooding filtering materials, and has simple operation and accurate and reliable result.
(2) The invention establishes the evaluation index of the regeneration performance of the filter material as the product of the average turbidity of the backwashing sewage and the optimal backwashing strength, and the method not only considers the factors of density, granularity, thickness and the like, but also can distinguish the regeneration performance of the filter materials with different materials and different surface characteristics.
(3) At present, no systematic evaluation method for the oil field water injection filtering material exists in China, and the method provided by the invention can be used for evaluating the impurity removal SS, oil removal and regeneration performances of the oil field water injection filtering material, and provides theoretical basis and reference value for the optimization of the oil field filtering material.
Drawings
FIG. 1 is a schematic structural connection diagram of an oil field water injection filter material performance evaluation device.
Detailed Description
The invention is further defined in the following, but not limited to, the figures and examples in the description.
As shown in fig. 1, the performance evaluation device for the oil field water injection filtering material comprises a raw water barrel 1, a liquid level sensor 2, a stirrer 3, a raw water pump 4, a filtering water inlet valve 5, a first pressure gauge 6, a filtering column 7, a filtering water outlet valve 8, a backwashing water inlet valve 9, a second pressure gauge 10, a backwashing water outlet valve 11, a backwashing pump 12 and a clear water barrel 13; a liquid level sensor 2 is arranged in the raw water barrel 1; the upper end of the raw water barrel 1 is provided with a stirrer 3; a filtering water inlet valve 5 and a first pressure gauge 6 are sequentially connected between the raw water pump 4 and the inlet of the filter column 7; a back-flushing water outlet valve 11 is arranged at the top inlet of the filter column; a second pressure gauge 10 is arranged at the outlet of the bottom of the filter column, and a filtering water outlet valve 8 and a backwashing water inlet valve 9 are respectively arranged at the outlet of the bottom of the filter column in two paths; the backwash water inlet valve 9, the backwash pump 12 and the clear water barrel 13 are communicated in sequence.
The performance evaluation method of the oil field water injection filtering material specifically comprises the following steps:
(1) determination of evaluation conditions
The filtering speed is 9.5-10.5 ml/min, the SS concentration of the SS-containing filtered raw water is 90-110mg/L, the oil content of the oil-containing filtered raw water is 90-110mg/L, and the temperature is room temperature.
(2) Selection of filter material
The particle size of the filtering material is 16-20 meshes, the particle size is 0.8-1.2mm, and the thickness of the filtering layer is 0.7-1.2 m;
the filtering material comprises electrostatic sand, quartz sand and carborundum.
(3) Evaluation of SS-removing Properties of Filter Material
A. Under the temperature condition, the filter material is loaded into the filter column 7, the liquid level sensor 2 is opened, the filter raw water with the concentration of SS is added into the raw water barrel 1, the water is added to 900mL at 800-;
B. opening the filtering water inlet valve 5 and the filtering water outlet valve 8; closing the back washing water inlet valve 9 and the back washing water outlet valve 11; the raw water pump 4 is started, the filtering speed is the filtering speed, and the filtering material starts to filter;
C. and (3) sampling after filtering for 7-8h, measuring turbidity of filtered water by using a turbidity meter, converting a relation curve to obtain SS concentration X of filtered water, and dividing SS removing performance grade of the filtering material according to the value of the X value.
If X is less than or equal to 5mg/L, the SS removing performance of the filter material is I grade;
if X is more than 5mg/L and less than or equal to 10mg/L, the SS removing performance of the filter material is level II;
if X is more than 10mg/L and less than or equal to 15mg/L, the SS removing performance of the filter material is grade III;
if X is more than 15mg/L and less than or equal to 20mg/L, the SS removing performance of the filter material is IV grade;
if X is more than 20mg/L and less than or equal to 30mg/L, the SS removing performance of the filter material is V grade;
if X is more than 30mg/L, the SS removing performance of the filter material is poor.
(4) Evaluation of oil removing Performance of Filter Material
A. Under the temperature condition, the filter material is put into the filter column 7, the liquid level sensor 2 is opened, the filter raw water with the oil concentration is added into the raw water barrel 1, the water is added to 800mL plus 700-;
B. opening the filtering water inlet valve 5 and the filtering water outlet valve 8; closing the back washing water inlet valve 9 and the back washing water outlet valve 11; the raw water pump 4 is started, the filtering speed is the filtering speed, and the filtering material starts to filter;
C. and filtering for 7-8h, then sampling to obtain the oil-containing concentration Y of the filtered water, measuring the absorbance of the oil-containing concentration Y by a spectrophotometer, then converting by a relation curve, and dividing the oil removal performance grade of the filtering material according to the value of the Y.
If Y is less than or equal to 20mg/L, the oil removal performance of the filter material is grade I;
if Y is more than 20mg/L and less than or equal to 25mg/L, the oil removal performance of the filter material is level II;
if Y is more than 25mg/L and less than or equal to 30mg/L, the oil removal performance of the filter material is grade III;
if Y is more than 30mg/L and less than or equal to 35mg/L, the oil removal performance of the filter material is IV grade;
if Y is more than 35mg/L and less than or equal to 40mg/L, the oil removal performance of the filter material is V-level;
if Y is more than 40mg/L, the oil removal performance of the filter material is poor.
(5) Evaluation of regeneration Performance of Filter Material
A. Under the temperature condition, a filter material is filled into a filter column 7, a liquid level sensor 2 is opened, the filter raw water with the oil concentration is added into a raw water barrel 1, water is added to 800mL of 700-;
B. opening a filtering water inlet valve 5 and a filtering water outlet valve 8; closing the back washing water inlet valve 9 and the back washing water outlet valve 11; the raw water pump 4 is started, the filtering speed is the filtering speed, and the filtering material starts to filter;
C. after filtering for 7-8h, injecting 1-2L of tap water into the clear water barrel 13;
D. opening a backwashing water inlet valve 9 and a backwashing water outlet valve 11, and closing a filtering water inlet valve 5 and a filtering water outlet valve 8;
E. the backwashing pump 12 is opened, the filtering material starts backwashing, and the optimal backwashing strength of the filtering material is measured;
F. after backwashing the filter material for 10-20min, sampling from a backwashing water outlet every 2min, measuring the turbidity of backwashing sewage, and calculating the product I of the average turbidity of the backwashing sewage and the optimal backwashing strength; and classifying the regeneration performance grade of the filter material according to the I value.
If I is less than or equal to 1, the regeneration performance of the filter material is grade I;
if I is more than 1 and less than or equal to 1.5, the regeneration performance of the filter material is grade II;
if I is more than 1.5 and less than or equal to 2, the regeneration performance of the filter material is grade III;
if I is more than 2 and less than or equal to 2.5, the regeneration performance of the filter material is IV grade;
if I is more than 2.5 and less than or equal to 3, the regeneration performance of the filter material is grade V;
if I > 3, the filter material has poor regeneration properties.
The optimal backwashing strength is calculated according to the following formula:
uB＝ut/10
in the formula: u. ofBThe optimal backwashing strength is m/s;
utmeans the settling velocity of a single filter material particle, m/s;
ρSmeans the density of the filter material, kg/m3；
ρFMeans the density of water, kg/m3；
g is gravitational acceleration, m/s2；
Mu means the viscosity of water at room temperature, mPa · s;
d is the filter particle size, m.
The average turbidity of the backwashing sewage is calculated according to the following formula:
wherein n is 5;
τi1means that the 2i minute sample is taken for the first measurement of turbidity value;
τi2the second measurement of turbidity value is taken at the 2i minute;
τi3means that the sample is taken at the 2i minute and the turbidity value is measured for the third time.
Example 1: SS removing performance evaluation of quartz sand, walnut shell and garnet filter materials
SS removing performance evaluation of three filter materials of quartz sand, walnut shells and garnet, wherein the specific evaluation method comprises the following steps:
(1) selection of filter material
The particle size of the filtering material is 16-20 meshes, the particle size is 0.8-1.0mm, and the thickness of a filtering layer is 0.7 m;
(2) evaluation of SS-removing Properties of Filter Material
A. Under the condition of room temperature, loading a filter material into a filter column 7, opening a liquid level sensor 2, adding filtered raw water with SS concentration of 100mg/L into a raw water barrel 1, adding water to 800mL, starting a stirrer to stir for 30min, and uniformly stirring the filtered raw water;
B. opening the filtering water inlet valve 5 and the filtering water outlet valve 8; closing the back washing water inlet valve 9 and the back washing water outlet valve 11; the raw water pump 4 is started, the filtering speed is 10ml/min, and the filtering material starts to filter;
C. and (4) filtering for 7h, then sampling, measuring turbidity of filtered water by using a turbidity meter, and converting by using a relation curve to obtain the SS concentration X of the filtered water.
SS concentrations of filtered water of the quartz sand, the walnut shells and the garnet are respectively 6.52mg/L, 2.86mg/L and 8.15mg/L, and respectively accord with the evaluation standards of grade II, grade I and grade II of the invention.
Example 2: evaluation of oil removal performance of three filter materials of quartz sand, walnut shell and garnet
The oil removal performance evaluation method of the quartz sand, walnut shell and garnet filter materials comprises the following specific evaluation methods:
(1) selection of filter material
The particle size of the filtering material is 16-20 meshes, the particle size is 1.0mm, and the thickness of a filtering layer is 0.8 m;
(2) evaluation of oil removing Performance of Filter Material
A. Under the condition of room temperature, loading a filter material into a filter column 7, opening a liquid level sensor 2, adding filtered raw water with the oil concentration of 90mg/L into a raw water barrel 1, adding water to 800mL, starting a stirrer to stir for 50min, and uniformly stirring the filtered raw water;
B. opening the filtering water inlet valve 5 and the filtering water outlet valve 8; closing the back washing water inlet valve 9 and the back washing water outlet valve 11; the raw water pump 4 is started, the filtering speed is 9.5ml/min, and the filtering material starts to filter;
C. and filtering for 8h, and then sampling to obtain the oil-containing concentration Y of the filtered water, wherein the oil-containing concentration Y is obtained by firstly measuring the absorbance through a spectrophotometer and then converting through a relation curve.
The oil concentrations of the filtered water of the quartz sand, the walnut shells and the garnet are respectively 26.7mg/L, 17.3mg/L and 28.5mg/L, and the oil concentrations respectively accord with the grade III, I and III evaluation standards of the invention.
Example 3: evaluation of regeneration performance of three filter materials of quartz sand, walnut shell and garnet
The regeneration performance evaluation method of the quartz sand, walnut shell and garnet filter materials comprises the following specific evaluation methods:
(1) selection of filter material
The particle size of the filtering material is 16-20 meshes, the particle size is 1.2mm, and the thickness of a filtering layer is 1.2 m;
(2) evaluation of regeneration Performance of Filter Material
A. Under the condition of room temperature, loading a filter material into a filter column 7, opening a liquid level sensor 2, adding filtered raw water with the oil concentration of 110mg/L into a raw water barrel 1, adding water to 750mL, starting a stirrer to stir for 30min, and uniformly stirring the filtered raw water;
B. opening the filtering water inlet valve 5 and the filtering water outlet valve 8; closing the back washing water inlet valve 9 and the back washing water outlet valve 11; the raw water pump 4 is started, the filtering speed is 10.5ml/min, and the filtering material starts to filter;
C. after filtering for 7 hours, 1L of tap water is injected into the clear water bucket 13;
D. opening a backwashing water inlet valve 9 and a backwashing water outlet valve 11, and closing a filtering water inlet valve 5 and a filtering water outlet valve 8;
E. the backwashing pump 12 is opened, the filtering material starts backwashing, and the optimal backwashing strength of the filtering material is measured;
F. and (3) after backwashing the filtering material for 10min, sampling from a backwashing water outlet every 2min, measuring the turbidity of backwashing sewage, and calculating the product I of the average turbidity of the backwashing sewage and the optimal backwashing strength.
The I values of the quartz sand, the walnut shells and the garnet are 1.4, 2.1 and 1.2 respectively, and respectively accord with the II, IV and II grade evaluation indexes of the invention.
Claims (7)
1. The method for evaluating the performance of the oil field water injection filtering material is characterized by comprising the following steps of:
(1) determination of evaluation conditions
The filtering speed is 9.5-10.5 ml/min, the SS concentration of the SS-containing filtered raw water is 90-110mg/L, the oil content of the oil-containing filtered raw water is 90-110mg/L, and the temperature is room temperature;
(2) selection of filter material
The particle size of the filtering material is 16-20 meshes, the particle size is 0.8-1.2mm, and the thickness of the filtering layer is 0.7-1.2 m;
(3) evaluation of SS-removing Properties of Filter Material
A. Under the temperature condition, a filter material is loaded into a filter column, a liquid level sensor is turned on, the filtered raw water with the concentration of SS is added into a raw water bucket, water is added to be 800-;
B. opening a filtering water inlet valve and a filtering water outlet valve; closing the back washing water inlet valve and the back washing water outlet valve; starting the raw water pump, wherein the filtering speed is the filtering speed, and the filtering material starts to filter;
C. sampling after filtering for 7-8h, measuring turbidity of filtered water by using a turbidity meter, converting a relation curve to obtain SS concentration X of filtered water, and dividing SS removing performance grade of a filtering material according to the size of the X value;
(4) evaluation of oil removing Performance of Filter Material
A. Under the temperature condition, a filter material is loaded into a filter column, a liquid level sensor is turned on, the raw filter water with the oil content is added into a raw water bucket, water is added to 700-;
B. opening a filtering water inlet valve and a filtering water outlet valve; closing the back washing water inlet valve and the back washing water outlet valve; starting the raw water pump, wherein the filtering speed is the filtering speed, and the filtering material starts to filter;
C. filtering for 7-8h, then sampling to obtain the oil-containing concentration Y of the filtered water, measuring the absorbance of the oil-containing concentration Y by a spectrophotometer, then converting a relation curve to obtain the oil-containing concentration Y, and dividing the oil-removing performance grade of the filtering material according to the value of the Y;
(5) evaluation of regeneration Performance of Filter Material
A. Under the temperature condition, a filter material is loaded into a filter column, a liquid level sensor is turned on, the raw filter water with the oil content is added into a raw water bucket, water is added to 700-;
B. opening a filtering water inlet valve and a filtering water outlet valve; closing the back washing water inlet valve and the back washing water outlet valve; starting the raw water pump, wherein the filtering speed is the filtering speed, and the filtering material starts to filter;
C. after filtering for 7-8 hours, injecting 1-2L of tap water into the clear water barrel;
D. opening a backwashing water inlet valve and a backwashing water outlet valve, and closing a filtering water inlet valve and a filtering water outlet valve;
E. opening a backwashing pump, starting backwashing the filter material, and measuring the optimal backwashing strength of the filter material;
F. after backwashing the filter material for 10-20min, sampling from a backwashing water outlet every 2min, measuring the turbidity of backwashing sewage, and calculating the product I of the average turbidity of the backwashing sewage and the optimal backwashing strength; and classifying the regeneration performance grade of the filter material according to the I value.
2. The method for evaluating the performance of the oil field water flooding filter material according to claim 1, wherein the SS-removing performance grade of the filter material is divided according to the value X, and the specific division standard is as follows:
if X is less than or equal to 5mg/L, the SS removing performance of the filter material is I grade;
if X is more than 5mg/L and less than or equal to 10mg/L, the SS removing performance of the filter material is level II;
if X is more than 10mg/L and less than or equal to 15mg/L, the SS removing performance of the filter material is grade III;
if X is more than 15mg/L and less than or equal to 20mg/L, the SS removing performance of the filter material is IV grade;
if X is more than 20mg/L and less than or equal to 30mg/L, the SS removing performance of the filter material is V grade;
if X is greater than 30mg/L, the SS-removing performance of the filter material is poor.
3. The method for evaluating the performance of the oil field water flooding filtering material according to claim 1, wherein the oil removal performance grade of the filtering material is divided according to the value of Y, and the specific division standard is as follows:
if Y is less than or equal to 20mg/L, the oil removal performance of the filter material is grade I;
if Y is more than 20mg/L and less than or equal to 25mg/L, the oil removal performance of the filter material is level II;
if Y is more than 25mg/L and less than or equal to 30mg/L, the oil removal performance of the filter material is grade III;
if Y is more than 30mg/L and less than or equal to 35mg/L, the oil removal performance of the filter material is IV grade;
if Y is more than 35mg/L and less than or equal to 40mg/L, the oil removal performance of the filter material is V-level;
if Y is more than 40mg/L, the oil removal performance of the filter material is poor.
4. The method for evaluating the performance of the oil field water flooding filter material according to claim 1, wherein the regeneration performance grade of the filter material is divided according to the I value, and the specific division standard is as follows:
if I is less than or equal to 1, the regeneration performance of the filter material is grade I;
if I is more than 1 and less than or equal to 1.5, the regeneration performance of the filter material is grade II;
if I is more than 1.5 and less than or equal to 2, the regeneration performance of the filter material is grade III;
if I is more than 2 and less than or equal to 2.5, the regeneration performance of the filter material is IV grade;
if I is more than 2.5 and less than or equal to 3, the regeneration performance of the filter material is grade V;
if I > 3, the filter material has poor regeneration properties.
5. The method for evaluating the performance of the oilfield flooding filtering material according to claim 1, wherein the optimal backwashing strength of the backwashing sewage is calculated according to the following formula:
uB＝ut/10
in the formula: u. ofBThe optimal backwashing strength is m/s;
utmeans the settling velocity of a single filter material particle, m/s;
ρSmeans the density of the filter material, kg/m3；
ρFMeans the density of water, kg/m3；
g is gravitational acceleration, m/s2；
Mu means the viscosity of water at room temperature, mPa · s;
d is the filter particle size, m.
6. The method for evaluating the performance of the oilfield flooding filtering material according to claim 1, wherein the average turbidity of the backwash wastewater is calculated by the following formula:
wherein n is 5;
τi1means that the 2i minute sample is taken for the first measurement of turbidity value;
τi2the second measurement of turbidity value is taken at the 2i minute;
τi3means that the sample is taken at the 2i minute and the turbidity value is measured for the third time.
7. The method for evaluating the performance of the oilfield flooding filter material according to claim 1, wherein the filter material comprises electrostatic sand, quartz sand and carborundum.
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