CN108084979A - A kind of barium and strontium sulfate descaling agent - Google Patents
A kind of barium and strontium sulfate descaling agent Download PDFInfo
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- CN108084979A CN108084979A CN201611037683.3A CN201611037683A CN108084979A CN 108084979 A CN108084979 A CN 108084979A CN 201611037683 A CN201611037683 A CN 201611037683A CN 108084979 A CN108084979 A CN 108084979A
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- snaking
- descaling agent
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- 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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Abstract
A kind of barium and strontium sulfate descaling agent in order to eliminate blocking of the barium and strontium sulfate to stratum, is invented and is prepared for lurid sulfate descaling agent, which can effectively remove sulfate scale, recovers fouling core permeability.Under the conditions of 60 DEG C, the snaking efficiency about 80% of 8% several 10% snaking liquid；Rise temperature can improve snaking efficiency, and for temperature from when rising to 80 DEG C for 20 DEG C, snaking efficiency increases to 85.65% from 80.52%；With snaking time lengthening, snaking efficiency, which increases, simultaneously gradually to be stablized, and snaking efficiency during 12h reaches 83.0%；At several 70 DEG C, 10 PV, 100 mg/L snaking liquid is injected after water drive, fouling core permeability recovers to 85.56% number 92.59% of original permeability 30.The descaling agent is small to the corrosivity of tubing and casing, and at 25 DEG C and 60 DEG C, 10% snaking liquid is respectively 0.0404 and 0.1014 mm/a to the corrosion rate of tubing and casing, less than common acid fluid system, is conducive to safe construction.
Description
Technical field
The present invention relates to a kind of descaling agent more particularly to a kind of barium and strontium sulfate descaling agents.
Background technology
Oil-field flooding is hyposmosis, the common method of extra permeability oilfield exploitation.When injecting water and water flooding is incompatible,
Form barium and strontium sulfate in earth formation deep and block stratum, cause later stage water injection pressure is high, note not into.
For the blocking of water filling formation scaling permeability is caused drastically to decline problem, Jia Hongyu and Todd etc. have been carried out into dirty machine
Reason and Scaling Tendency Prediction research.It cores to Changqing oilfields long-term injecting water strata drilling discovery, has newborn carbonate mineral and contain
Celestobarite is formed, it was demonstrated that there are scale formations on water filling stratum.Domestic and international technical staff has done largely in terms of oil reservoir descaling agent
Work obtains the descaling agent for having better effects to carbonate scale, iron dirt and organic deposition；Compared with calcium descaling agent, barium strontium at present
Dirty descaling agent solubility for scale is relatively low, is only the 20% of calcium snaking efficiency.
The content of the invention
The purpose of the invention is to eliminate blocking of the barium and strontium sulfate to stratum, it is clear to devise a kind of barium and strontium sulfate
Dirty agent.
The technical solution adopted by the present invention to solve the technical problems is：
Barium and strontium sulfate descaling agent to prepare raw material as follows：Barium sulfate, sodium acetate, sodium oxalate, analysis are pure；Five second of diethylenetriamine
Acid（DTPA）, five sodium of diethylene triamine pentacetic acid (DTPA)（DTPA-5Na）, ethylenediamine tetra-acetic acid（EDTA）, aminotrimethylene phosphate
（ATMP）, ethylenediamine tetraacetic methene sodium phosphate（EDTMPS）, diethylene triamine pentamethylene phosphonic（DTPMPA）, technical grade；10%KOH
Solution；Make mud acid by oneself（12%HCl+3%HF）；Ji's plateau oilfield injection water and water flooding（Ion forms）；Distilled water；Artificial core,
φ 2.54cm, 200 several 500 mesh of quartz sand.
The preparation method of barium and strontium sulfate descaling agent is as follows：DTPA-5Na is dissolved in distilled water, under stiring according to corresponding
Ratio sequentially adds sodium acetate, sodium oxalate, DTPA, EDTA, ATMP, EDTMPS, DTPMPA and 10%KOH solution, in adition process
Temperature maintains 60 DEG C, pH value is adjusted to 13 numbers 14, constant temperature 2h with KOH solution, obtained sulfate descaling agent is light yellow liquid
Body.
The snaking rate of the descaling agent increases with descaling agent dosage and is improved, after dosage is more than 8%, snaking efficiency speedup
Slow down.
The temperature rise, snaking efficiency is slowly increased, but amplification is smaller.
Corrosion rate of the snaking liquid under 60 DEG C or room temperature is less than regular mud acid, with oil field stratum water or injection water
Substantially quite, heavy corrosion will not be generated to metal material, working security is good.
The beneficial effects of the invention are as follows：
Barium and strontium sulfate descaling agent can effectively remove sulfate scale, recover fouling core permeability；Under the conditions of 60 DEG C, 8% number
The snaking efficiency about 80% of 10% snaking liquid；Rise temperature can improve snaking efficiency, and temperature is from when rising to 80 DEG C for 20 DEG C, snaking efficiency
85.65% is increased to from 80.52%；With snaking time lengthening, snaking efficiency, which increases, simultaneously gradually to be stablized, and snaking efficiency during 12h reaches
83.0%；30 at several 70 DEG C, 10PV100mg/L snaking liquid is injected after water drive, fouling core permeability recovers to original permeability
85.56% number 92.59%.The descaling agent is small to the corrosivity of tubing and casing, and at 25 DEG C and 60 DEG C, 10% snaking liquid is to tubing and casing
Corrosion rate is respectively 0.0404 and 0.1014mm/a, less than common acid fluid system, is conducive to safe construction.
Specific embodiment
Case study on implementation 1：
Barium and strontium sulfate descaling agent to prepare raw material as follows：Barium sulfate, sodium acetate, sodium oxalate, analysis are pure；Five second of diethylenetriamine
Acid（DTPA）, five sodium of diethylene triamine pentacetic acid (DTPA)（DTPA-5Na）, ethylenediamine tetra-acetic acid（EDTA）, aminotrimethylene phosphate
（ATMP）, ethylenediamine tetraacetic methene sodium phosphate（EDTMPS）, diethylene triamine pentamethylene phosphonic（DTPMPA）, technical grade；10%KOH
Solution；Make mud acid by oneself（12%HCl+3%HF）；Ji's plateau oilfield injection water and water flooding（Ion forms）；Distilled water；Artificial core,
φ 2.54cm, 200 several 500 mesh of quartz sand.The preparation method of barium and strontium sulfate descaling agent is as follows：DTPA-5Na is dissolved in distillation
Water, under stiring according to corresponding proportion sequentially add sodium acetate, sodium oxalate, DTPA, EDTA, ATMP, EDTMPS, DTPMPA and
10%KOH solution, temperature maintains 60 DEG C in adition process, and pH value is adjusted to 13 numbers 14, constant temperature 2h, obtained sulphur with KOH solution
Hydrochlorate descaling agent is light yellow liquid.
Case study on implementation 2：
The snaking efficiency of descaling agent is measured using precipitation gravimetry.500 milliliters of beakers of access and quantitative filter paper, are placed in 105 DEG C
It in baking oven, takes out afterwards for 24 hours, is put into drier and cools down 30min.Weigh barium sulfate scale sample（m1）It adds in beaker, adds clear
Dirty agent is simultaneously stirred continuously, and is put into insulating box, and filtering is taken out in reaction afterwards for 24 hours, is dried 4h at 105 DEG C, is cooled down in drier
30min weighs the quality of remaining dirt（m2）.The ratio of dirty sample quality is snaking before the front and rear of poor quality and reaction of dirty sample reaction
Efficiency（S）.Sulfate descaling agent is made into the solution of 300mL different quality containings respectively, adds 5.0g barium sulfate scale samples,
Normal pressure, molten dirt for 24 hours, investigates influence of the descaling agent dosage to snaking efficiency under the conditions of 60 DEG C.As a result and analyze：With descaling agent dosage
Increase, snaking efficiency improve, after dosage is more than 8%, snaking efficiency slowdown in growth.This is because when snaking agent concentration is relatively low, solution
Middle barium ions is completely combined with chelating agent, therefore when concentration increases, snaking efficiency increases；When snaking agent concentration increases to centainly
After value, since barium sulfate indissoluble object ion solubility product constant Ksp values are very low（25 DEG C, Ksp=1.166 × 10-10）, in solution
Ba2+ supply deficiencies, so as to control complex reaction rate, continuing, which increases concentration snaking efficiency, increases unobvious.On oil-water well stratum
When implementing snaking measure, snaking efficiency and economic benefit are considered, descaling agent optimum add amount is 8% number 10%, and snaking efficiency reaches
To 80% or so.
Case study on implementation 3：
The snaking efficiency of descaling agent is measured using precipitation gravimetry.500 milliliters of beakers of access and quantitative filter paper, are placed in 105 DEG C
It in baking oven, takes out afterwards for 24 hours, is put into drier and cools down 30min.Weigh barium sulfate scale sample（m1）It adds in beaker, adds clear
Dirty agent is simultaneously stirred continuously, and is put into insulating box, and filtering is taken out in reaction afterwards for 24 hours, is dried 4h at 105 DEG C, is cooled down in drier
30min weighs the quality of remaining dirt（m2）.The ratio of dirty sample quality is snaking before the front and rear of poor quality and reaction of dirty sample reaction
Efficiency（S）.When descaling agent dosage is 10%, influence of the measuring temperature to snaking efficiency.As a result and analyze：Temperature raises, snaking
Efficiency is slowly increased, but amplification is smaller.This is because being raised with temperature, the Ksp variations of barium sulfate are little, ionize barium in the solution
Ion velocity is relatively slow caused.Therefore, stratum snaking efficiency can be slightly above ground during actual formation snaking.
Case study on implementation 4：
The snaking efficiency of descaling agent is measured using precipitation gravimetry.500 milliliters of beakers of access and quantitative filter paper, are placed in 105 DEG C
It in baking oven, takes out afterwards for 24 hours, is put into drier and cools down 30min.Weigh barium sulfate scale sample（m1）It adds in beaker, adds clear
Dirty agent is simultaneously stirred continuously, and is put into insulating box, and filtering is taken out in reaction afterwards for 24 hours, is dried 4h at 105 DEG C, is cooled down in drier
30min weighs the quality of remaining dirt（m2）.The ratio of dirty sample quality is snaking before the front and rear of poor quality and reaction of dirty sample reaction
Efficiency（S）.Under the conditions of 10%, 60 DEG C of descaling agent dosage, influence of the reaction time to snaking efficiency is measured.As a result and analyze：Clearly
Dirty efficiency increases with the extension of snaking time, and snaking efficiency when reacting 12h reaches 83.0%, continues to extend the reaction time, clearly
Dirty efficiency change is smaller.Theoretically snaking time longer snaking efficiency is higher, considers the factors such as construction efficiency, actual closing well
Reaction time may be designed as 24 hours.
Case study on implementation 5：
With reference to oil and gas industry standard SY/T5358-2010《Reservoir sensitivity flowing experiment evaluation method》, evaluate sulfuric acid
Salt descaling agent is to having occurred the plugging removal effect of fouling and clogging rock core.First, with the permeability of stratum aquametry artificial core, then
Water will be injected with water flooding with maximum fouling mixing ratio（Volume ratio 4: 6）Injection rock core makes its fouling and clogging, works as core permeability
When being down to about 60%, start to inject snaking liquid, measure permeability resume figure（Permeability ratio before and after displacement）.As a result and analyze：
30 under conditions of several 70 DEG C, after injecting mixed sample 10PV, core permeability is down to 60% number 70% of original permeability；Injection
After 100mg/L snaking liquid, core permeability starts to recover, when injecting 10PV, resume permeability to original permeability
85.56% number 92.59%, average value 88.92%.At 70 DEG C, core permeability loss ratio is minimum（7.41%）；Rock at 30 DEG C
Heart permeability damage rate is maximum（14.44%）, the recovery of core permeability under high temperature is higher than cryogenic conditions.Therefore, for fouling
The rock core of blocking has better snaking de-plugging performance under sulfate descaling agent high temperature.
Case study on implementation 6：
By oil and gas industry standard SY/T0026-1999《Aqueous corrosion test method》, commented respectively under 60 DEG C and room temperature
The corrosive nature of valency descaling agent, and compared with the corrosive nature of mud acid, oil field stratum water and injection water.During site operation,
Snaking liquid is an important technical indicator to the corrosive nature of oil, casing metal material.Under 60 DEG C and room temperature, snaking is measured
Liquid, mud acid, oil field stratum water and the corrosive nature for injecting water.As a result and analyze：Corrosion speed of the snaking liquid under 60 DEG C or room temperature
Rate is less than regular mud acid, suitable with oil field stratum water or water base of injection, and heavy corrosion, construction peace will not be generated to metal material
Full property is good.
Claims (5)
1. a kind of barium and strontium sulfate descaling agent to prepare raw material as follows：Barium sulfate, sodium acetate, sodium oxalate, analysis are pure；Divinyl three
Triamine pentaacetic acid（DTPA）, five sodium of diethylene triamine pentacetic acid (DTPA)（DTPA-5Na）, ethylenediamine tetra-acetic acid（EDTA）, three methene phosphorus of amino
Acid（ATMP）, ethylenediamine tetraacetic methene sodium phosphate（EDTMPS）, diethylene triamine pentamethylene phosphonic（DTPMPA）, technical grade；10%
KOH solution；Make mud acid by oneself（12%HCl+3%HF）；Ji's plateau oilfield injection water and water flooding（Ion forms）；Distilled water；Artificial rock
The heart, φ 2.54cm, 200 several 500 mesh of quartz sand.
2. barium and strontium sulfate descaling agent according to claim 1, it is characterized in that preparation method is as follows：DTPA-5Na is dissolved in
Distilled water sequentially adds sodium acetate, sodium oxalate, DTPA, EDTA, ATMP, EDTMPS, DTPMPA according to corresponding proportion under stiring
With 10%KOH solution, temperature maintains 60 DEG C in adition process, pH value is adjusted to 13 numbers 14 with KOH solution, constant temperature 2h is obtained
Sulfate descaling agent is light yellow liquid.
3. barium and strontium sulfate descaling agent according to claim 1, it is characterized in that the snaking rate of the descaling agent is with snaking
Agent dosage increases and improves, after dosage is more than 8%, snaking efficiency slowdown in growth.
4. barium and strontium sulfate descaling agent according to claim 1, it is characterized in that the temperature rise, snaking efficiency are slow
Increase, but amplification is smaller.
5. barium and strontium sulfate descaling agent according to claim 1, it is characterized in that the snaking liquid is under 60 DEG C or room temperature
Corrosion rate less than regular mud acid, with oil field stratum water or water base of injection quite, serious corruption will not be generated to metal material
Erosion, working security are good.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611037683.3A CN108084979A (en) | 2016-11-23 | 2016-11-23 | A kind of barium and strontium sulfate descaling agent |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611037683.3A CN108084979A (en) | 2016-11-23 | 2016-11-23 | A kind of barium and strontium sulfate descaling agent |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109264879A (en) * | 2018-09-26 | 2019-01-25 | 中国石油天然气股份有限公司 | A kind of barium strontium dirt scale remover and preparation method thereof |
| CN111560242A (en) * | 2020-05-25 | 2020-08-21 | 西安长庆化工集团有限公司 | Synergist for acidification of earth acid and preparation and use methods thereof |
| CN112745820A (en) * | 2021-02-01 | 2021-05-04 | 西南石油大学 | Barium sulfate scale dissolving agent |
-
2016
- 2016-11-23 CN CN201611037683.3A patent/CN108084979A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109264879A (en) * | 2018-09-26 | 2019-01-25 | 中国石油天然气股份有限公司 | A kind of barium strontium dirt scale remover and preparation method thereof |
| CN109264879B (en) * | 2018-09-26 | 2021-08-31 | 中国石油天然气股份有限公司 | Barium-strontium scale remover and preparation method thereof |
| CN111560242A (en) * | 2020-05-25 | 2020-08-21 | 西安长庆化工集团有限公司 | Synergist for acidification of earth acid and preparation and use methods thereof |
| CN112745820A (en) * | 2021-02-01 | 2021-05-04 | 西南石油大学 | Barium sulfate scale dissolving agent |
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