CN105112036A - Barium-strontium-calcium descaling and blockage removing agent for near-well area and preparing method of barium-strontium-calcium descaling and blockage removing agent - Google Patents
Barium-strontium-calcium descaling and blockage removing agent for near-well area and preparing method of barium-strontium-calcium descaling and blockage removing agent Download PDFInfo
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- CN105112036A CN105112036A CN201510521958.XA CN201510521958A CN105112036A CN 105112036 A CN105112036 A CN 105112036A CN 201510521958 A CN201510521958 A CN 201510521958A CN 105112036 A CN105112036 A CN 105112036A
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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
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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
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/12—Swell inhibition, i.e. using additives to drilling or well treatment fluids for inhibiting clay or shale swelling or disintegrating
Abstract
The invention discloses a barium-strontium-calcium descaling and blockage removing agent for a near-well area and a preparing method of the barium-strontium-calcium descaling and blockage removing agent. The barium-strontium-calcium descaling and blockage removing agent comprises a polyamine carboxylate solution, nonionic surfactant accounting for 3%-10% of the total mass of the polyamine carboxylate solution and an emulsion breaker accounting for 2%-8% of the total mass of the polyamine carboxylate solution. The polyamine carboxylate solution is prepared from polyamine midbody and chloroacetic acid salt through a reaction, wherein the polyamine midbody is prepared through organic amine and epoxy chloropropane with the mole ratio of 1.05-1.5:1 through a reaction, and the chloroacetic acid salt is prepared from chloroacetic acid and alkali with the same mole ratio through a reaction. The barium-strontium-calcium descaling and blockage removing agent for the near-well area has a good removing effect on indissolvable salt such as barium sulfate, strontium sulfate and calcium sulfate, and the descaling rate is higher than 40%. Meanwhile, the barium-strontium-calcium descaling and blockage removing agent has the expansion preventing and inhibiting performance, the clay expansion reducing rate is higher than 80%, corrosion to equipment is slight, and water locking can be avoided. Blockage removing can be effectively achieved on a reservoir stratum near a well, the permeability of the reservoir stratum is improved, and thus the recovery ratio of oil and gas resources is increased.
Description
Technical field
The present invention relates to a kind of descaling and blockage relieving agent for immediate vicinity of wellbore, oil field and preparation method thereof, particularly the descaling and blockage relieving agent and preparation method thereof of a kind of calcium sulfate for oil field, Strontium Sulphate, barium sulfate.
Background technology
In the performance history of hydrocarbon resources, utilize water filling to improve method extensively each elephant application at home of recovery ratio.Due in the middle of noted water and reservoir all containing abundant Ca
2+, Ba
2+, Sr
2+deng positively charged ion and SO
4 2-negatively charged ion, will generate the difficulty soluble salts such as calcium sulfate, barium sulfate, Strontium Sulphate when this cationoid and negatively charged ion meet, cause on water filling stratum, Structure Phenomenon appears in tubing and casing, gathering line, uphole equipment, have a strong impact on the exploitation of hydrocarbon resources.In addition, because drilling fluid many uses barite of the overwhelming majority increases the weight of, cause pore plugging the immediate vicinity of wellbore of reservoir is as easy as rolling off a log, especially in horizontal well drilling process, this phenomenon is particularly serious.The ordinary method addressed this problem is pickling, but the problem that pickling brings is serious to equipment corrosion, and can not dissolve the inorganic salt such as calcium sulfate, barium sulfate, Strontium Sulphate due to acid.The inorganic particles such as undissolved calcium sulfate, barium sulfate, Strontium Sulphate easily cause secondary injury to reservoir.
Two approach solved the problem are: (1) stops formation and the gathering of calcium sulfate, barium sulfate, Strontium Sulphate etc.; (2) established dirt or pore plugging are removed and de-plugging.Existing patent report mostly is the first approach.Publication CN201110314543.7 has invented a kind of Barium-Strontium Sulfate Scale Retarder, containing the composition such as poly-epoxy succinic hydrochloric acid, polyamines Quito ether methylenephosphonic acid, ZG-558 Scale inhibitors (being formed by maleic anhydride, Propylene glycol monoacrylate, sodium hypophosphite copolymerization), polyquaternium, water.Mechanism is by divalent ions such as sequestrant complexing calcium, strontium, barium, stops it to contact with sulfate radical and generates indissoluble inorganic salt, and the formation by stoping the modes such as difficulty soluble salt crystal accumulation growth to stop incrustation scale; Publication CN201210404432.X, CN201210408497.1, CN201210484135.0 etc. disclose the scale-inhibiting properties of Scale inhibitors and the testing method of influence factor; But this approach can only slow down fouling, can not thoroughly suppress.Therefore, the second approach is also needed.Have at present and report about the invention of scale remover, the publication CN201410097184.8 as Xi'an Petroleum University's application relates to a kind of barium sulfate, Strontium Sulphate scale remover and preparation method thereof, and host of its formula is a kind of nitrogenous polycarboxylic acid.In addition, publication CN201210480955.2, CN201210478949.3, CN201210480940.6, CN201210484037.7, CN201210484180.6, CN201210483230.9, CN201210486464.9, CN201210486482.7 etc. disclose the influence factor of scale remover and the testing method of performance.
Summary of the invention
The barium strontium calcium descaling and blockage relieving agent for immediate vicinity of wellbore of the de-plugging of the reservoir blocking that the object of the present invention is to provide a kind of removing for the incrustation scale containing the component such as calcium sulfate, barium sulfate, Strontium Sulphate in oil field and cause because of weighting agent barium sulfate.
Another object of the present invention is to provide a kind of and prepare the preparation method that this has the barium strontium calcium descaling and blockage relieving agent for immediate vicinity of wellbore of descaling and blockage relieving and suppression clay swelling function concurrently.
To achieve these goals, barium strontium calcium descaling and blockage relieving agent for immediate vicinity of wellbore of the present invention, comprise polyamine carboxylic acid salt solution, account for the nonionic surface active agent surfactivity of polyamine carboxylic acid salt solution total mass 3% ~ 10% and account for the emulsion splitter of polyamine carboxylic acid salt solution total mass 2% ~ 8%; The chloracetate that the chloroethene bronsted lowry acids and bases bronsted lowry that described polyamine carboxylic acid salt solution is the polyamine intermediate and equimolar amount that the organic amine of 1.05 ~ 1.5:1 and epoxy chloropropane mix preparation by mol ratio is mixed with reacts and is prepared from, and the mol ratio of described Mono Chloro Acetic Acid and described organic amine is 2.5 ~ 5:1.
For a preparation method for the barium strontium calcium descaling and blockage relieving agent of immediate vicinity of wellbore, comprise the following steps:
(1) polyamine is prepared:
Under room temperature condition, organic amine is dissolved in the water of 1 ~ 2 times of quality, ice-water bath temperature control, stir and slowly drip epoxy chloropropane simultaneously, the mol ratio of described organic amine and described epoxy chloropropane is 1.05 ~ 1.5:1, drips under returning to room temperature condition after terminating and continues stirring 1 ~ 2h, then be warming up to 50 DEG C ~ 70 DEG C and stir 3 ~ 5h, stop heating, be cooled to room temperature, namely obtain polyamine midbody solution;
(2) polyamine carboxylate salt is prepared:
In temperature control 1 ~ 5 DEG C of temperature range, Mono Chloro Acetic Acid is dissolved in the water of 2 times of quality, described in described Mono Chloro Acetic Acid and step (1), the mol ratio of organic amine is 2.5 ~ 5:1, stir and slowly drip and the alkaline solution of Mono Chloro Acetic Acid equimolar amount or the alkaline solution being slightly more than Mono Chloro Acetic Acid mole number simultaneously, hydrogen ion in described Mono Chloro Acetic Acid is overlapped by the hydroxide ion in alkaline solution completely, obtained corresponding chloracetate solution, use ice-water bath temperature control in reaction process, control reacting liquid temperature and be no more than 30 DEG C (temperature of reaction can be floated between 5 ~ 30 DEG C);
The chloracetate solution obtained is joined in step (1) and obtain in polyamine midbody solution, stirred at ambient temperature 10 ~ 20min, then drip alkaline solution regulator solution pH to 10 ~ 12, then be warming up to reaction 4 ~ 6h between 50 ~ 60 DEG C, namely obtain polyamine carboxylic acid salt solution;
(3) descaling and blockage relieving agent is prepared:
The nonionic surface active agent tensio-active agent accounting for polyamine carboxylic acid salt solution total mass 3% ~ 10% and the emulsion splitter accounting for polyamine carboxylic acid salt solution total mass 2% ~ 8% is added in the polyamine carboxylic acid salt solution that step (2) is obtained, stirring 15 ~ 30min to mixing, namely obtaining barium strontium calcium descaling and blockage relieving agent.
Described organic amine in step (1) is quadrol, diethylenetriamine or triethylene tetramine.
Described alkaline solution in step (2) is the sodium hydroxide solution of 30wt% or the potassium hydroxide solution of 30wt%.
Described nonionic surface active agent in step (3) is alkylphenol polyoxyethylene class nonionic surface active agent or fatty alcohol polyethenoxy ether class nonionic surface active agent.
Preferably, described alkylphenol polyoxyethylene class nonionic surface active agent is OP-7 or OP-9.
Preferably, described fatty alcohol polyethenoxy ether class nonionic surface active agent is AEO-7 or AEO-9.
Described emulsion splitter in step (3) is AP type emulsion splitter and AE type emulsion splitter.
Preferably, described AP type emulsion splitter is AP8051, AP212, AP134 or AP136 emulsion splitter.
Preferably, described AE type emulsion splitter is AE1910, AE9901 type, AE0604, AE31 or AE8031.
There is the polyamine multi-carboxylate of extremely strong sequestering power for host in the barium strontium calcium descaling and blockage relieving agent prescription of this immediate vicinity of wellbore, dissolve the indissoluble inorganic salt such as calcium sulfate, barium sulfate, Strontium Sulphate in the basic conditions, and there is superior anti-swollen rejection ability and dispersive ability, play and suppress clay swelling migration in stratum, prevention indissoluble inorganic salt gathering fouling, greatly reduce scale remover to the secondary injury of reservoir; In addition, also preferred tensio-active agent and emulsion splitter in formula, its role is to the oil slick on incrustation scale surface capable of washing on the one hand, be conducive to sequestrant and contact with the direct of incrustation scale; Can prevent scale remover in construction process from causing reservoir water to lock on the other hand; Be conducive to the dispersion of solia particle and not coagulation simultaneously.
The barium strontium calcium descaling and blockage relieving agent of this immediate vicinity of wellbore has good elimination effect, descaling rate >40% to difficulty soluble salts such as barium sulfate, Strontium Sulphate, calcium sulfate; Meanwhile, this has anti-swollen rejection, clay swelling reduced rate rate >80%, slight to the corrodibility of equipment, and water can not be caused to lock.Effectively to nearly well reservoir blockages relieving, reservoir permeability can be improved, and then improve the recovery ratio of hydrocarbon resources.
Embodiment
Below in conjunction with embodiment, foregoing invention content of the present invention is described in further detail.But this should be interpreted as that the scope of the above-mentioned theme of the present invention is only limitted to following embodiment.Without departing from the idea case in the present invention described above, according to ordinary skill knowledge and customary means, make various replacement and change, all should comprise within the scope of the invention.
Embodiment 1
(1) preparation of polyamine:
At ambient temperature, 50mL triethylene tetramine is dissolved in the water of 50mL, ice-water bath also slowly drips 24.9g epoxy chloropropane when stirring, and control temperature of reaction at 5 ~ 30 DEG C in the process dripped, continue to stir 1h under returning to room temperature condition after dropping terminates, be then warming up to 60 DEG C and continue to stir 4h, stop heating, be cooled to room temperature, obtained polyamine intermediate;
(2) preparation of polyamine carboxylate salt:
109g Mono Chloro Acetic Acid is dissolved in 2 DEG C of frozen water of 218g, ice-water bath temperature control, stir and slowly add the sodium hydroxide solution that 154g massfraction is 30% wherein simultaneously, control reacting liquid temperature and be no more than 30 DEG C, joined in the obtained polyamine solution of step (1) by obtained for reaction sodium chloroacetate solution, stirring 10min, is then the sodium hydroxide solution regulator solution pH to 12 of 30% with massfraction, be warming up to 50 DEG C of reaction 6h again, obtained polyamine carboxylic acid salt solution;
(3) preparation of descaling and blockage relieving agent
In the polyamine carboxylic acid salt solution that step (2) is obtained, add 50g fatty alcohol polyethenoxy ether class surfactant A EO-9 and 40gAP type emulsion splitter AP212, mix the barium strontium calcium descaling and blockage relieving agent namely obtaining this immediate vicinity of wellbore.
Embodiment 2
(1) preparation of polyamine:
At ambient temperature, 50mL diethylenetriamine is dissolved in the water of 100mL, ice-water bath also slowly drips 40g epoxy chloropropane when stirring, and control temperature of reaction at 5 ~ 30 DEG C in the process dripped, continue to stir 1h under returning to room temperature condition after dropping terminates, be then warming up to 60 DEG C and continue to stir 5h, stop heating, be cooled to room temperature, obtained polyamine intermediate;
(2) preparation of polyamine carboxylate salt:
172g Mono Chloro Acetic Acid is dissolved in 2 DEG C of frozen water of 344g, ice-water bath temperature control, stir and slowly add the sodium hydroxide solution that 242g massfraction is 30% wherein simultaneously, control reacting liquid temperature and be no more than 30 DEG C, joined in the obtained polyamine solution of step (1) by obtained for reaction sodium chloroacetate solution, stirring 10min, is then the sodium hydroxide solution regulator solution pH to 10 of 30% with massfraction, be warming up to 60 DEG C of reaction 4h again, obtained polyamine carboxylic acid salt solution;
(3) preparation of descaling and blockage relieving agent:
In the polyamine carboxylic acid salt solution that step (2) is obtained, add 20g fatty alcohol polyethenoxy ether class surfactant A EO-7,20gAE type emulsion splitter AE0604, mix the barium strontium calcium descaling and blockage relieving agent namely obtaining this immediate vicinity of wellbore.
Embodiment 3
(1) preparation of polyamine:
At ambient temperature, 50mL diethylenetriamine is dissolved in the water of 100mL, ice-water bath also slowly drips 40g epoxy chloropropane when stirring, and control temperature of reaction at 5 ~ 30 DEG C in the process dripped, continue to stir 1h under returning to room temperature condition after dropping terminates, be then warming up to 60 DEG C and continue to stir 5h, stop heating, be cooled to room temperature, obtained polyamine intermediate;
(2) preparation of polyamine carboxylate salt:
108g Mono Chloro Acetic Acid is dissolved in 2 DEG C of frozen water of 216g, ice-water bath temperature control, stir and slowly add the sodium hydroxide solution that 152g massfraction is 30% wherein simultaneously, control reacting liquid temperature and be no more than 30 DEG C, joined in the obtained polyamine solution of step (1) by obtained for reaction sodium chloroacetate solution, stirring 10min, is then the sodium hydroxide solution regulator solution pH to 11 of 30% with massfraction, be warming up to 60 DEG C of reaction 4h again, obtained polyamine carboxylic acid salt solution;
(3) preparation of descaling and blockage relieving agent:
In the polyamine carboxylic acid salt solution that step (2) is obtained, add 25g alkylphenol polyoxyethylene class Surfactant OP-7,24gAP type emulsion splitter AP134, mix the barium strontium calcium descaling and blockage relieving agent namely obtaining this immediate vicinity of wellbore.
Performance test:
(1) descaling and blockage relieving performance test:
Descaling and blockage relieving performance test methods is as follows:
(1) descaling and blockage relieving agent in embodiment is configured to the aqueous solution that massfraction is 50%, the descaling and blockage relieving agent aqueous solution configured by 100g is placed in the wide-necked bottle that can seal, then adds 10g barium sulfate, adds magneton and seals;
(2) utilize oil bath temperature control 50 DEG C or 80 DEG C and be cooled to room temperature after heating 24h or 48h under magnetic stirring;
(3) get a filter paper, weighing quality is m
1, filter cooled reaction solution, and constantly use clean water filter cake, then carry out drying to filter cake and filter paper, after oven dry, the quality weighing filter paper and filter cake is m
2;
(4) descaling and blockage relieving efficiency (f) calculates:
Calculation formula: f=[1-(m
2-m
1)/10] * 100%;
Test result is as shown in table 1 below.
Table 1:
From data in upper table 1, descaling and blockage relieving agent of the present invention circulates and can meet scale removal needs in 2 days at the temperature of 80 DEG C, realizes the de-plugging efficiency of more than 40%.
(2) anti-swollen rejection test:
Anti-swollen rejection testing method is as follows:
(1) take 0.50g bentonite in powder, load in 10mL centrifuge tube, add the embodiment solution that 10mL massfraction is 10%, fully shake up, at room temperature place 2h, load in whizzer, centrifugation 15min under rotating speed is 1500r/min, measures the intumescent system V of bentonite in powder
1;
(2) repeating step (1), replaces with 10mL deionized water the aqueous solution that massfraction is the embodiment of 10%, measures bentonite in powder expanding volume V in deionized water
2;
(3) repeating step (1), replaces with 10mL kerosene the aqueous solution that massfraction is the embodiment of 10%, measures bentonite in powder expanding volume V in deionized water
0;
(4) anti-dilative B (%) calculates: anti-dilative presses formulae discovery below:
B＝(V
2-V
1)/(V
2-V
0)*100％；
This test result is as shown in table 2.
Table 2: descaling and blockage relieving agent is tested the anti-dilative of clay
| Test products | Anti-dilative |
| The aqueous solution of 10wt% embodiment 1 | 85％ |
| The aqueous solution of 10wt% embodiment 2 | 89％ |
| The aqueous solution of 10wt% embodiment 3 | 83％ |
From data in table 2, descaling and blockage relieving agent of the present invention has anti-clayswelling rejection, effectively prevents descaling and blockage relieving agent from causing clay swelling to cause reservoir pore space to block in actual applications.
(3) Evaluation of Corrosion Resistance
Carried out Evaluation of Corrosion Resistance to product prepared by embodiment 1 ~ 3, its testing method is with reference to industry standard SY/T0026-1999, and wherein, test steel are grade of steel is the steel of N80, and probe temperature is 80 DEG C, and test result is as shown in table 3.
Table 3: the erosion analysis of scale remover
| Test products | Erosion rate (mm/a) | Evaluate |
| The aqueous solution of 50wt% embodiment 1 | 0.02735 | Mild corrosion |
| The aqueous solution of 50wt% embodiment 2 | 0.02846 | Mild corrosion |
| The aqueous solution of 50wt% embodiment 3 | 0.02659 | Mild corrosion |
As can be seen from data in table 3, descaling and blockage relieving agent of the present invention only has slight erosion to steel, can meet underground construction requirement completely.
Above-described embodiment and respective performances test are only the explanations to product of the present invention; not any pro forma restriction is made to the present invention; within the scope not departing from technical solution of the present invention; any equivalent utilizing the technology contents of above-mentioned announcement to make simple transformation, all belongs to protection scope of the present invention.
Claims (10)
1. the barium strontium calcium descaling and blockage relieving agent for immediate vicinity of wellbore, it is characterized in that, comprise polyamine carboxylic acid salt solution, account for the nonionic surface active agent of polyamine carboxylic acid salt solution total mass 3% ~ 10% and account for the emulsion splitter of polyamine carboxylic acid salt solution total mass 2% ~ 8%; Described polyamine carboxylic acid salt solution is that chloracetate that the Mono Chloro Acetic Acid of the polyamine intermediate made of the organic amine of 1.05 ~ 1.5:1 and epichlorohydrin reaction and equimolar amount and alkali reaction are made reacts and is prepared from by mol ratio, and the mol ratio of described Mono Chloro Acetic Acid and described organic amine is 2.5 ~ 5:1.
2., as claimed in claim 1 for a barium strontium calcium descaling and blockage relieving agent for immediate vicinity of wellbore, it is characterized in that, comprise the following steps:
(1) polyamine is prepared:
Under room temperature condition, organic amine is dissolved in the water of 1 ~ 2 times of quality, ice-water bath temperature control, stir and slowly drip epoxy chloropropane simultaneously, the mol ratio of described organic amine and described epoxy chloropropane is 1.05 ~ 1.5:1, drips under returning to room temperature condition after terminating and continues stirring 1 ~ 2h, then be warming up to 50 DEG C ~ 70 DEG C and stir 3 ~ 5h, stop heating, be cooled to room temperature, namely obtain polyamine midbody solution;
(2) polyamine carboxylate salt is prepared:
At 1 ~ 5 DEG C of temperature, Mono Chloro Acetic Acid is dissolved in the water of 2 times of quality, described in described Mono Chloro Acetic Acid and step (1), the mol ratio of organic amine is 2.5 ~ 5:1, stir and slowly drip the alkaline solution with Mono Chloro Acetic Acid equimolar amount simultaneously, obtained chloracetate solution, the chloracetate solution obtained is joined in step (1) and obtain in polyamine midbody solution, stirred at ambient temperature 10 ~ 20min, then alkaline solution regulator solution pH to 10 ~ 12 are dripped, be warming up to again between 50 ~ 60 DEG C and react 4 ~ 6h, namely obtain polyamine carboxylic acid salt solution;
(3) descaling and blockage relieving agent is prepared:
The nonionic surface active agent accounting for polyamine carboxylic acid salt solution total mass 3% ~ 10% and the emulsion splitter accounting for polyamine carboxylic acid salt solution total mass 2% ~ 8% is added in the polyamine carboxylic acid salt solution that step (2) is obtained, stirring 15 ~ 30min to mixing, namely obtaining barium strontium calcium descaling and blockage relieving agent.
3. the barium strontium calcium descaling and blockage relieving agent for immediate vicinity of wellbore according to claim 2, it is characterized in that, the described organic amine in step (1) is quadrol, diethylenetriamine or triethylene tetramine.
4. the barium strontium calcium descaling and blockage relieving agent for immediate vicinity of wellbore according to claim 2, it is characterized in that, the described alkaline solution in step (2) is the sodium hydroxide solution of 30wt% or the potassium hydroxide solution of 30wt%.
5. the barium strontium calcium descaling and blockage relieving agent for immediate vicinity of wellbore according to claim 2, it is characterized in that, the described nonionic surface active agent in step (3) is alkylphenol polyoxyethylene or fatty alcohol-polyoxyethylene ether.
6. the barium strontium calcium descaling and blockage relieving agent for immediate vicinity of wellbore according to claim 5, it is characterized in that, described alkylphenol polyoxyethylene class nonionic surface active agent is OP-7 or OP-9.
7. the barium strontium calcium descaling and blockage relieving agent for immediate vicinity of wellbore according to claim 5, it is characterized in that, described fatty alcohol polyethenoxy ether class nonionic surface active agent is AEO-7 or AEO-9.
8. the barium strontium calcium descaling and blockage relieving agent for immediate vicinity of wellbore according to claim 2, is characterized in that, the described emulsion splitter in step (3) is AP type emulsion splitter and AE type emulsion splitter.
9. the barium strontium calcium descaling and blockage relieving agent for immediate vicinity of wellbore according to claim 8, it is characterized in that, described AP type emulsion splitter is AP8051, AP212, AP134 or AP136.
10. the barium strontium calcium descaling and blockage relieving agent for immediate vicinity of wellbore according to claim 8, it is characterized in that, described AE type emulsion splitter is AE1910, AE9901, AE0604, AE31 or AE8031.
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Cited By (7)
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| CN108005615A (en) * | 2017-11-22 | 2018-05-08 | 中国石油集团渤海钻探工程有限公司 | A kind of de-plugging construction technology for being used to release the pollution of barium strontium calcium compound scale |
| CN109575894A (en) * | 2018-12-29 | 2019-04-05 | 大庆紫源石油科技开发有限公司 | A kind of oilfield chemistry oil recovery neutral de-plugging agent and preparation method thereof |
| US10266745B2 (en) | 2017-02-03 | 2019-04-23 | Saudi Arabian Oil Company | Anti-bit balling drilling fluids, and methods of making and use thereof |
| CN112094633A (en) * | 2020-10-29 | 2020-12-18 | 四川中汇安达石油化工有限公司 | Chelating type blocking remover and preparation method and application thereof |
| CN114085659A (en) * | 2020-08-24 | 2022-02-25 | 中国石油天然气股份有限公司 | Descaling blocking remover for high-temperature and high-pressure oil and gas wells and preparation method thereof |
| CN117384611A (en) * | 2023-12-13 | 2024-01-12 | 东营煜煌能源技术有限公司 | Solid descaling blocking remover and preparation method thereof |
| CN117511527A (en) * | 2024-01-02 | 2024-02-06 | 东营煜煌能源技术有限公司 | Descaling blocking remover and preparation method thereof |
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