CN103849365B - A kind of inhibitor for oil well sulfate scale and Synthesis and applications thereof - Google Patents
A kind of inhibitor for oil well sulfate scale and Synthesis and applications thereof Download PDFInfo
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- CN103849365B CN103849365B CN201410108953.XA CN201410108953A CN103849365B CN 103849365 B CN103849365 B CN 103849365B CN 201410108953 A CN201410108953 A CN 201410108953A CN 103849365 B CN103849365 B CN 103849365B
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- 239000003112 inhibitor Substances 0.000 title claims abstract description 64
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 title claims abstract description 49
- 239000003129 oil well Substances 0.000 title claims abstract description 19
- 230000015572 biosynthetic process Effects 0.000 title abstract description 6
- 238000003786 synthesis reaction Methods 0.000 title abstract description 6
- 239000000203 mixture Substances 0.000 claims abstract description 25
- 229920000805 Polyaspartic acid Polymers 0.000 claims abstract description 13
- 230000003301 hydrolyzing effect Effects 0.000 claims abstract description 13
- 229920000141 poly(maleic anhydride) Polymers 0.000 claims abstract description 13
- 108010064470 polyaspartate Proteins 0.000 claims abstract description 13
- 229940120146 EDTMP Drugs 0.000 claims abstract description 12
- NFDRPXJGHKJRLJ-UHFFFAOYSA-N edtmp Chemical compound OP(O)(=O)CN(CP(O)(O)=O)CCN(CP(O)(O)=O)CP(O)(O)=O NFDRPXJGHKJRLJ-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229910052708 sodium Inorganic materials 0.000 claims abstract description 12
- 239000011734 sodium Substances 0.000 claims abstract description 12
- 239000002253 acid Substances 0.000 claims abstract description 11
- 229920000642 polymer Polymers 0.000 claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 34
- 238000000034 method Methods 0.000 claims description 19
- 238000011049 filling Methods 0.000 claims description 14
- 229920001577 copolymer Polymers 0.000 claims description 10
- 238000004519 manufacturing process Methods 0.000 claims description 10
- 238000002360 preparation method Methods 0.000 claims description 7
- 125000005396 acrylic acid ester group Chemical group 0.000 claims description 6
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 claims description 6
- JHUFGBSGINLPOW-UHFFFAOYSA-N 3-chloro-4-(trifluoromethoxy)benzoyl cyanide Chemical compound FC(F)(F)OC1=CC=C(C(=O)C#N)C=C1Cl JHUFGBSGINLPOW-UHFFFAOYSA-N 0.000 claims description 5
- NIXOWILDQLNWCW-UHFFFAOYSA-N Acrylic acid Chemical compound OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 5
- BAPJBEWLBFYGME-UHFFFAOYSA-N acrylic acid methyl ester Natural products COC(=O)C=C BAPJBEWLBFYGME-UHFFFAOYSA-N 0.000 claims description 5
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical group O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims description 5
- 239000007864 aqueous solution Substances 0.000 claims description 4
- 230000005764 inhibitory process Effects 0.000 abstract description 18
- XYFCBTPGUUZFHI-UHFFFAOYSA-N Phosphine Chemical compound P XYFCBTPGUUZFHI-UHFFFAOYSA-N 0.000 abstract description 4
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 239000007788 liquid Substances 0.000 abstract description 2
- 229910000073 phosphorus hydride Inorganic materials 0.000 abstract description 2
- 239000002455 scale inhibitor Substances 0.000 description 42
- 230000002401 inhibitory effect Effects 0.000 description 20
- 239000000523 sample Substances 0.000 description 15
- 238000012360 testing method Methods 0.000 description 15
- 150000002500 ions Chemical class 0.000 description 7
- WOIHABYNKOEWFG-UHFFFAOYSA-N [Sr].[Ba] Chemical compound [Sr].[Ba] WOIHABYNKOEWFG-UHFFFAOYSA-N 0.000 description 6
- 238000011156 evaluation Methods 0.000 description 6
- 230000001629 suppression Effects 0.000 description 6
- 238000004364 calculation method Methods 0.000 description 5
- 238000003756 stirring Methods 0.000 description 5
- 229910001427 strontium ion Inorganic materials 0.000 description 5
- IRLPACMLTUPBCL-KQYNXXCUSA-N 5'-adenylyl sulfate Chemical compound C1=NC=2C(N)=NC=NC=2N1[C@@H]1O[C@H](COP(O)(=O)OS(O)(=O)=O)[C@@H](O)[C@H]1O IRLPACMLTUPBCL-KQYNXXCUSA-N 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 240000008067 Cucumis sativus Species 0.000 description 1
- 235000010799 Cucumis sativus var sativus Nutrition 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 125000002843 carboxylic acid group Chemical group 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000010189 synthetic method Methods 0.000 description 1
- 229920001897 terpolymer Polymers 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/52—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning
- C09K8/528—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning inorganic depositions, e.g. sulfates or carbonates
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B37/00—Methods or apparatus for cleaning boreholes or wells
- E21B37/06—Methods or apparatus for cleaning boreholes or wells using chemical means for preventing or limiting, e.g. eliminating, the deposition of paraffins or like substances
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Geochemistry & Mineralogy (AREA)
- Agricultural Chemicals And Associated Chemicals (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Abstract
The invention discloses a kind of inhibitor for oil well sulfate scale and Synthesis and applications thereof.The weight percent that the composition that this inhibitor contains and each composition account for inhibitor is: polycarboxylic acid polymer 35% ~ 45%; Poly aspartic acid 25% ~ 35%; Hydrolytic polymaleic anhydride 10% ~ 15%; 2-thiol group tetrahydroglyoxaline 15% ~ 20%; Ethylene diamine tetra methylene phosphonic acid sodium 2% ~ 5%.Inhibitor of the present invention is liquid; To BaSO
4and SrSO
4the inhibition of fouling is good; Low containing phosphine amount, component is easily biodegradable, good environmental protection; Temperature limit is wide, and use temperature can up to 100 DEG C.
Description
Technical field
The present invention relates to a kind of inhibitor for oil well sulfate scale and Synthesis and applications thereof.
Background technology
In oil mining process, on the one hand, when stratum corrosion ion, inject after the ion that carries of water enters local water, cause water intermediate ion incompatible and produce precipitation, on the other hand, when temperature, pressure and other parameters change cause local water intermediate ion to balance destruction, Cucumber is made to exceed solubility product and deposit.The material of these depositions is called as dirt, and oil well fouling is divided into carbonate scale and sulfate scale by the component according to dirt, and the former mainly contains CaCO
3and MgCO
3, the latter mainly contains BaSO
4and SrSO
4.When after oil well fouling, reservoir can be injured, block pit shaft or cause underdeposit corrosion, seriously reduce production efficiency, and increase production cost.
Adopting chemical agent to control fouling is the major measure used at present, and the inhibitor developed for carbonate scale is very many, but less for the inhibitor of sulfate scale.Sulfate scale is once generate, and its dirt is hard, and is difficult to by acid-soluble erosion, is be difficult to removing, therefore how effectively suppresses Ba
2+, Sr
2+with SO
4 2-fouling is technical problem urgently to be resolved hurrily at present.
Summary of the invention
In order to solve the problems of the technologies described above, the invention provides a kind of inhibitor for oil well sulfate scale and Synthesis and applications thereof
The weight percent that the composition that contains for the inhibitor of oil well sulfate scale provided by the invention and each composition account for inhibitor is:
Polycarboxylic acid polymer 35% ~ 45%;
Poly aspartic acid 25% ~ 35%;
Hydrolytic polymaleic anhydride 10% ~ 15%;
2-thiol group tetrahydroglyoxaline 15% ~ 20%;
Ethylene diamine tetra methylene phosphonic acid sodium 2% ~ 5%.
Preferably, the weight percent that the composition that above-mentioned inhibitor contains and each composition account for inhibitor is:
Polycarboxylic acid polymer 38%;
Poly aspartic acid 30%;
Hydrolytic polymaleic anhydride 12%;
2-thiol group tetrahydroglyoxaline 16%;
Ethylene diamine tetra methylene phosphonic acid sodium 4%.
Preferably, described polycarboxylic acid polymer is MALEIC ANHYDRIDE/vinylformic acid/sodium allyl sulfonate/methyl acrylate copolymer, vinylformic acid-2-acrylamide-2-methyl propane sulfonic multipolymer or acrylic acid/esters/co-polymer of sulfonate.
The invention provides the preparation method of above-mentioned inhibitor, according to described amount, each composition is mixed.
The invention provides the application of above-mentioned inhibitor: by water-soluble for described inhibitor, be mixed with the aqueous solution, then annotate in oil well, filling rate calculates by water production rate, the concentration making inhibitor be dissolved in local water in well is 30mg/L ~ 600mg/L, adopts continuous dosing method to carry out.
As optimal technical scheme, by water-soluble for described inhibitor, being mixed with total concn is 50 ~ 500g/L aqueous solution.
Inhibitor for oil well sulfate scale of the present invention has following Advantageous Effects:
1, inhibitor of the present invention is liquid; To BaSO
4the inhibition of fouling is good; To SrSO
4the inhibition of fouling is good.
2, inhibitor of the present invention is low containing phosphine amount, and component is easily biodegradable, good environmental protection;
3, inhibitor temperature limit of the present invention is wide, and use temperature can up to 100 DEG C.
Embodiment
Below in conjunction with specific embodiment, the invention will be further described, can better understand the present invention and can be implemented, but illustrated embodiment is not as a limitation of the invention to make those skilled in the art.
The present invention is for a kind of inhibitor of oil well sulfate scale, and the weight percent that described inhibitor accounts for described inhibitor containing, for example lower composition and each composition is:
Polycarboxylic acid polymer 35% ~ 45%;
Poly aspartic acid 25% ~ 35%;
Hydrolytic polymaleic anhydride 10% ~ 15%;
2-thiol group tetrahydroglyoxaline 15% ~ 20%;
Ethylene diamine tetra methylene phosphonic acid sodium 2% ~ 5%.
Wherein polycarboxylic acid polymer is MALEIC ANHYDRIDE/vinylformic acid/sodium allyl sulfonate/methyl acrylate copolymer, vinylformic acid-2-acrylamide-2-methyl propane sulfonic multipolymer or acrylic acid/esters/co-polymer of sulfonate.
In component, polycarboxylic acid polymer, poly aspartic acid, hydrolytic polymaleic anhydride and ethylene diamine tetra methylene phosphonic acid sodium all can be used for the generation suppressing dirt, wherein hydrolytic polymaleic anhydride makes divalent-metal ion form stable soluble chelating thing by sequestering action, improve ion permissible concentration, poly aspartic acid is by stoping structure in plane of crystal adsorption, polycarboxylic acid polymer disperses crystallite by adsorbing the fouling crystallite of identical charges under electrostatic repulsion effect, stops collision to form dirt.Owing to suppressing the mechanism of dirt there are differences, therefore good synergy can be played.Meanwhile, sulfonic group, carboxylic acid group and amino isopolarity contained by this several material are comparatively strong, and very well, 2-thiol group tetrahydroglyoxaline is good tensio-active agent, therefore this formula is soluble in local water, plays good restraining effect to scale-forming ion in water for dispersiveness and wetting ability.2-thiol group tetrahydroglyoxaline or a kind of inhibiter, slow down the corrodibility of local water to metal tubing string.
When implementing, the inhibitor of oil well sulfate scale of the present invention is dissolved in the water by mass percentage successively, be configured to the total concn of 50 ~ 500g/L, during Xiang Jingzhong filling, filling rate calculates by water production rate, the concentration making inhibitor be dissolved in local water in well is 30mg/L ~ 600mg/L, adopts continuous dosing method to carry out.
Sulfate scale inhibitor advantage of the present invention is: 1, solubility property is good, easily constructs; 2, to BaSO
4and SrSO
4fouling has good suppression efficiency; 3, the feature of environmental protection is good.4, use temperature wide ranges.
Specific embodiment:
Embodiment 1
The sulfate scale inhibitor of the present embodiment, the weight percent accounting for inhibitor containing, for example lower composition and each composition is:
Vinylformic acid-2-acrylamide-2-methyl propane sulfonic multipolymer 38%;
Poly aspartic acid 30%;
Hydrolytic polymaleic anhydride 12%;
2-thiol group tetrahydroglyoxaline 16%;
Ethylene diamine tetra methylene phosphonic acid sodium 4%;
Wherein, vinylformic acid-2-acrylamide-2-methyl propane sulfonic multipolymer is the AA/AMPS purchased from Shandong Taihe Water Treatment Co., Ltd..
The preparation method of above-mentioned sulfate scale inhibitor, step is as follows: take each component according to weight percent, mixes and stirs.
The inhibition evaluation of the present embodiment sulfate scale inhibitor: test according to People's Republic of China's oil and gas industry standard " scale inhibitor for oilfield method of evaluating performance (SY/T5673-93) ", probe temperature is 70 DEG C.Adopt atomic spectrophotometer test barium strontium ion concentration, and according to: the calculation formula specified in SY/T5673-93 calculates inhibiting rate (antiscaling rate).The implementation result of the present embodiment: BaSO
4and SrSO
4the inhibiting rate of fouling is respectively 94.0% and 94.4%.
In order to check the Applicable temperature scope of the present embodiment sulfate scale inhibitor, the present embodiment, under different probe temperatures, carries out testing (probe temperature is different from the temperature in this standard) according to People's Republic of China's oil and gas industry standard " scale inhibitor for oilfield method of evaluating performance (SY/T5673-93) ".After tested and calculate, at 25 DEG C, the inhibition of the sulfate scale inhibitor of the present embodiment is: BaSO
4and SrSO
4the inhibiting rate of fouling is respectively 97.2% and 96.7%; At 100 DEG C, the inhibition of the sulfate scale inhibitor of the present embodiment is: BaSO
4and SrSO
4the inhibiting rate of fouling is respectively 91.4% and 91.8%.To sum up, can find out that the inhibitor temperature limit of the present embodiment is very wide.
When reality is implemented, the inhibitor of oil well sulfate scale of the present invention is dissolved in the water by mass percentage successively, be configured to the total concn (namely dissolving 50 ~ 500g inhibitor in 1L water) of 50 ~ 500g/L, during Xiang Jingzhong filling, filling rate calculates by water production rate, the concentration making inhibitor be dissolved in local water in well is 30mg/L ~ 600mg/L, adopts continuous dosing method to carry out.Result shows, and the inhibitor of the present embodiment is to BaSO
4and SrSO
4fouling has good suppression efficiency.
Embodiment 2
The sulfate scale inhibitor of the present embodiment, the weight percent accounting for inhibitor containing, for example lower composition and each composition is:
MALEIC ANHYDRIDE/vinylformic acid/sodium allyl sulfonate/methyl acrylate copolymer 45%;
Poly aspartic acid 25%;
Hydrolytic polymaleic anhydride 10%;
2-thiol group tetrahydroglyoxaline 15%;
Ethylene diamine tetra methylene phosphonic acid sodium 5%;
Wherein, MALEIC ANHYDRIDE/vinylformic acid/sodium allyl sulfonate/methyl acrylate copolymer can be prepared according to synthetic method disclosed in " the synthesis and property evaluation of novel barium (strontium) Scale inhibitors CD-1 " (Chongqing University of Science and Technology journal (natural science edition), the 3rd phase in 2009).
The preparation method of above-mentioned sulfate scale inhibitor, step is as follows: take each component according to weight percent, mixes and stirs.
The inhibition evaluation of the present embodiment sulfate scale inhibitor: test according to People's Republic of China's oil and gas industry standard " scale inhibitor for oilfield method of evaluating performance (SY/T5673-93) ", probe temperature 70 DEG C.Adopt atomic spectrophotometer test barium strontium ion concentration, and according to: the calculation formula specified in SY/T5673-93 calculates inhibiting rate (antiscaling rate).
The implementation result of the present embodiment: BaSO
4and SrSO
4the inhibiting rate of fouling is respectively 87.2% and 89.5%.
In order to check the Applicable temperature scope of the present embodiment sulfate scale inhibitor, the present embodiment, under different probe temperatures, carries out testing (probe temperature is different from the temperature in this standard) according to People's Republic of China's oil and gas industry standard " scale inhibitor for oilfield method of evaluating performance (SY/T5673-93) ".After tested and calculate, at 25 DEG C, the inhibition of the sulfate scale inhibitor of the present embodiment is: BaSO
4and SrSO
4the inhibiting rate of fouling is respectively 92.3% and 91.6%; At 100 DEG C, the inhibition of the sulfate scale inhibitor of the present embodiment is: BaSO
4and SrSO
4the inhibiting rate of fouling is respectively 85.2% and 85.1%.To sum up, can find out that the inhibitor temperature limit of the present embodiment is very wide.
When reality is implemented, the inhibitor of oil well sulfate scale of the present invention is dissolved in the water by mass percentage successively, be configured to the total concn of 50 ~ 500g/L, during Xiang Jingzhong filling, filling rate calculates by water production rate, the concentration making inhibitor be dissolved in local water in well is 30mg/L ~ 600mg/L, adopts continuous dosing method to carry out.Result shows, and the inhibitor of the present embodiment is to BaSO
4and SrSO
4fouling has good suppression efficiency.
Embodiment 3
The sulfate scale inhibitor of the present embodiment, the weight percent accounting for inhibitor containing, for example lower composition and each composition is:
Vinylformic acid-2-acrylamide-2-methyl propane sulfonic multipolymer 35%;
Poly aspartic acid 35%;
Hydrolytic polymaleic anhydride 15%;
2-thiol group tetrahydroglyoxaline 10%;
Ethylene diamine tetra methylene phosphonic acid sodium 5%;
Wherein, vinylformic acid-2-acrylamide-2-methyl propane sulfonic multipolymer is the AA/AMPS purchased from Shandong Taihe Water Treatment Co., Ltd..
The preparation method of above-mentioned sulfate scale inhibitor, step is as follows: take each component according to weight percent, mixes and stirs.
The inhibition evaluation of the present embodiment sulfate scale inhibitor: test according to People's Republic of China's oil and gas industry standard " scale inhibitor for oilfield method of evaluating performance (SY/T5673-93) ", probe temperature 70 DEG C.Adopt atomic spectrophotometer test barium strontium ion concentration, and according to: the calculation formula specified in SY/T5673-93 calculates inhibiting rate (antiscaling rate).
The implementation result of the present embodiment: BaSO
4and SrSO
4the inhibiting rate of fouling is respectively 92.60% and 90.00%.
In order to check the Applicable temperature scope of the present embodiment sulfate scale inhibitor, the present embodiment, under different probe temperatures, carries out testing (probe temperature is different from the temperature in this standard) according to People's Republic of China's oil and gas industry standard " scale inhibitor for oilfield method of evaluating performance (SY/T5673-93) ".After tested and calculate, at 25 DEG C, the inhibition of the sulfate scale inhibitor of the present embodiment is: BaSO
4and SrSO
4the inhibiting rate of fouling is respectively 95.6% and 94.4%; At 100 DEG C, the inhibition of the sulfate scale inhibitor of the present embodiment is: BaSO
4and SrSO
4the inhibiting rate of fouling is respectively 90.0% and 89.5%.To sum up, can find out that the inhibitor temperature limit of the present embodiment is very wide.
When reality is implemented, the inhibitor of oil well sulfate scale of the present invention is dissolved in the water by mass percentage successively, be configured to the total concn of 50 ~ 500g/L, during Xiang Jingzhong filling, filling rate calculates by water production rate, the concentration making inhibitor be dissolved in local water in well is 30mg/L ~ 600mg/L, adopts continuous dosing method to carry out.Result shows, and the inhibitor of the present embodiment is to BaSO
4and SrSO
4fouling has good suppression efficiency.
Embodiment 4
The sulfate scale inhibitor of the present embodiment, the weight percent accounting for inhibitor containing, for example lower composition and each composition is:
Acrylic acid/esters/co-polymer of sulfonate 40%;
Poly aspartic acid 30%;
Hydrolytic polymaleic anhydride 12%;
2-thiol group tetrahydroglyoxaline 16%;
Ethylene diamine tetra methylene phosphonic acid sodium 2%;
Wherein, acrylic acid/esters/co-polymer of sulfonate is the TH-613 acrylic acid/esters/sulfonate terpolymer purchased from Shandong Taihe Water Treatment Co., Ltd..
The preparation method of above-mentioned sulfate scale inhibitor, step is as follows: take each component according to weight percent, mixes and stirs.
The inhibition evaluation of the present embodiment sulfate scale inhibitor: test according to People's Republic of China's oil and gas industry standard " scale inhibitor for oilfield method of evaluating performance (SY/T5673-93) ", probe temperature 70 DEG C.Adopt atomic spectrophotometer test barium strontium ion concentration, and according to: the calculation formula specified in SY/T5673-93 calculates inhibiting rate (antiscaling rate).
The implementation result of the present embodiment: BaSO
4and SrSO
4the inhibiting rate of fouling is respectively 90.1% and 91.5%.
In order to check the Applicable temperature scope of the present embodiment sulfate scale inhibitor, the present embodiment, under different probe temperatures, carries out testing (probe temperature is different from the temperature in this standard) according to People's Republic of China's oil and gas industry standard " scale inhibitor for oilfield method of evaluating performance (SY/T5673-93) ".After tested and calculate, at 25 DEG C, the inhibition of the sulfate scale inhibitor of the present embodiment is: BaSO
4and SrSO
4the inhibiting rate of fouling is respectively 94.3% and 95.6%; At 100 DEG C, the inhibition of the sulfate scale inhibitor of the present embodiment is: BaSO
4and SrSO
4the inhibiting rate of fouling is respectively 89.4% and 89.7%.To sum up, can find out that the inhibitor temperature limit of the present embodiment is very wide.
When reality is implemented, the inhibitor of oil well sulfate scale of the present invention is dissolved in the water by mass percentage successively, be configured to the total concn of 50 ~ 500g/L, during Xiang Jingzhong filling, filling rate calculates by water production rate, the concentration making inhibitor be dissolved in local water in well is 30mg/L ~ 600mg/L, adopts continuous dosing method to carry out.Result shows, and the inhibitor of the present embodiment is to BaSO
4and SrSO
4fouling has good suppression efficiency.
Embodiment 5
The sulfate scale inhibitor of the present embodiment, the weight percent accounting for inhibitor containing, for example lower composition and each composition is:
Vinylformic acid-2-acrylamide-2-methyl propane sulfonic multipolymer 40%;
Poly aspartic acid 25%;
Hydrolytic polymaleic anhydride 10%;
2-thiol group tetrahydroglyoxaline 20%;
Ethylene diamine tetra methylene phosphonic acid sodium 5%;
Wherein, vinylformic acid-2-acrylamide-2-methyl propane sulfonic multipolymer is the AA/AMPS purchased from Shandong Taihe Water Treatment Co., Ltd..
The preparation method of above-mentioned sulfate scale inhibitor, step is as follows: take each component according to weight percent, mixes and stirs.
The inhibition evaluation of the present embodiment sulfate scale inhibitor: test according to People's Republic of China's oil and gas industry standard " scale inhibitor for oilfield method of evaluating performance (SY/T5673-93) ", probe temperature 70 DEG C.Adopt atomic spectrophotometer test barium strontium ion concentration, and according to: the calculation formula specified in SY/T5673-93 calculates inhibiting rate (antiscaling rate).
The implementation result of the present embodiment: BaSO
4and SrSO
4the inhibiting rate of fouling is respectively 91.4% and 91.7%.
In order to check the Applicable temperature scope of the present embodiment sulfate scale inhibitor, the present embodiment, under different probe temperatures, carries out testing (probe temperature is different from the temperature in this standard) according to People's Republic of China's oil and gas industry standard " scale inhibitor for oilfield method of evaluating performance (SY/T5673-93) ".After tested and calculate, at 20 DEG C, the inhibition of the sulfate scale inhibitor of the present embodiment is: BaSO
4and SrSO
4the inhibiting rate of fouling is respectively 96.7% and 96.3%; At 100 DEG C, the inhibition of the sulfate scale inhibitor of the present embodiment is: BaSO
4and SrSO
4the inhibiting rate of fouling is respectively 90.3% and 89.8%.To sum up, can find out that the inhibitor temperature limit of the present embodiment is very wide.
When reality is implemented, the inhibitor of oil well sulfate scale of the present invention is dissolved in the water by mass percentage successively, be configured to the total concn of 50 ~ 500g/L, during Xiang Jingzhong filling, filling rate calculates by water production rate, the concentration making inhibitor be dissolved in local water in well is 30mg/L ~ 600mg/L, adopts continuous dosing method to carry out.Result shows, and the inhibitor of the present embodiment is to BaSO
4and SrSO
4fouling has good suppression efficiency.
The above embodiment is only that protection scope of the present invention is not limited thereto in order to absolutely prove the preferred embodiment that the present invention lifts.The equivalent alternative or conversion that those skilled in the art do on basis of the present invention, all within protection scope of the present invention.Protection scope of the present invention is as the criterion with claims.
Claims (5)
1. for an inhibitor for oil well sulfate scale, it is characterized in that, the weight percent that its composition contained and each composition account for inhibitor is:
Polycarboxylic acid polymer 35% ~ 45%;
Poly aspartic acid 25% ~ 35%;
Hydrolytic polymaleic anhydride 10% ~ 15%;
2-thiol group tetrahydroglyoxaline 15% ~ 20%;
Ethylene diamine tetra methylene phosphonic acid sodium 2% ~ 5%;
Described polycarboxylic acid polymer is MALEIC ANHYDRIDE/vinylformic acid/sodium allyl sulfonate/methyl acrylate copolymer, vinylformic acid-2-acrylamide-2-methyl propane sulfonic multipolymer or acrylic acid/esters/co-polymer of sulfonate;
The weight percent sum that above-mentioned each composition accounts for inhibitor is 100%.
2. inhibitor according to claim 1, is characterized in that, the weight percent that its composition contained and each composition account for inhibitor is:
Polycarboxylic acid polymer 38%;
Poly aspartic acid 30%;
Hydrolytic polymaleic anhydride 12%;
2-thiol group tetrahydroglyoxaline 16%;
Ethylene diamine tetra methylene phosphonic acid sodium 4%.
3. the preparation method of the inhibitor described in claim 1 or 2, is characterized in that, is mixed by each composition according to described amount.
4. the application of the inhibitor described in claim 1 or 2, it is characterized in that, by water-soluble for described inhibitor, be mixed with the aqueous solution, then annotate in oil well, filling rate calculates by water production rate, and the concentration making inhibitor be dissolved in local water in well is 30mg/L ~ 600mg/L, adopts continuous dosing method to carry out.
5. application according to claim 4, is characterized in that, by water-soluble for described inhibitor, being mixed with total concn is 50 ~ 500g/L aqueous solution.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410108953.XA CN103849365B (en) | 2014-03-21 | 2014-03-21 | A kind of inhibitor for oil well sulfate scale and Synthesis and applications thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410108953.XA CN103849365B (en) | 2014-03-21 | 2014-03-21 | A kind of inhibitor for oil well sulfate scale and Synthesis and applications thereof |
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| CN104925968B (en) * | 2015-07-07 | 2017-03-01 | 西南石油大学 | A kind of salt tolerant high-temperature-resistant scale inhibitor and preparation method thereof |
| CN106675542A (en) * | 2016-12-12 | 2017-05-17 | 西安天太石化科技有限公司 | Multifunctional polyurethane injection enhancement agent for oil field |
| CN107983539A (en) * | 2017-12-06 | 2018-05-04 | 中南大学 | Application of the hydrolysis of polymaleic anhydride in Scheelite Flotation |
| CN108178343B (en) * | 2018-01-15 | 2021-05-07 | 东北石油大学 | Environment-friendly long-acting scale inhibitor for oil field and preparation method thereof |
| CN113429951B (en) * | 2021-08-02 | 2023-02-28 | 浙江砉润科技有限公司 | Biomass pollution-free oilfield blocking remover |
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