CN104745167A - Organic acid antiscaling agent for tubular column of water injection well - Google Patents
Organic acid antiscaling agent for tubular column of water injection well Download PDFInfo
- Publication number
- CN104745167A CN104745167A CN201510089699.8A CN201510089699A CN104745167A CN 104745167 A CN104745167 A CN 104745167A CN 201510089699 A CN201510089699 A CN 201510089699A CN 104745167 A CN104745167 A CN 104745167A
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- CN
- China
- Prior art keywords
- organic acid
- scale remover
- injection well
- antiscaling
- acid
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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
-
- 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
- C09K2208/32—Anticorrosion additives
Abstract
The invention discloses an organic acid antiscaling agent for a tubular column of a water injection well. The antiscaling agent is prepared from the following raw materials in percentage by weight: 7-18% of organic acids, 1-3% of a corrosion inhibitor, 1-5% of a penetrant and the balance of water. The antiscaling rate of the organic acid antiscaling agent on calcium carbonate scales is greater than 85% at the temperature of 50 DEG C and at the reaction time of 12 hours, the antiscaling rate on calcium sulfate scales is greater than 50%, the corrosion rate on a N-80 steel sheet is less than 2.0g/m<2>.h, and the corrosion inhibition rate is greater than 90%. For 13 water injection wells where an instrument encounters obstructions in a field layered test, according to a preferable organic acid antiscaling agent, after the tubular columns are descaled by using the organic acid antiscaling agent, the test instrument can normally trip in at one time, so that the layered test tasks of the water injection wells are completed. Compared with the conventional descaling operation of tripping the tubular column, the organic acid antiscaling agent is simple in field construction process, less in personnel and equipment required by construction, low in labor intensity of construction and short in construction time.
Description
Technical field
The present invention relates to oil-field flooding scale remover technical field, particularly relate to a kind of injection well pipe column organic acid scale remover.
Background technology
Water flooding is a kind of conventional reoovery method, and in oilfield injection water, an outstanding feature is exactly containing the easily incrustation ion such as a large amount of calcium, magnesium.Easily separate out in pipe string internal wall fouling under temperature variations, their one-tenth dirt speed quickly, pipeline open area is reduced rapidly, and due to dirty layer surface irregularity injustice, friction resistance is increased, more seriously due to the deposition of dirty layer, follow-up coiled tubing test operation excessively cannot be carried out.Therefore, dirty removing processing must be carried out to the tubing string of fouling.
Preferred chemical detergent adopts Organic Acid System, overcome the shortcomings such as the severe corrosive of strong acid, strong and stimulating and production and application inconvenience, maintain its advantage such as strong solubility, slightly acidic, can effectively scale removal, and do not corrode with tubing string, packing element, reaction product is all soluble salts, produce without secondary sedimentation, select nonionogenic tenside to be permeate agent simultaneously, reduce the bounding force between the particulate being attached to salt crust surface, make it automatically be scattered in solution under the effect of organic acid solution.
Summary of the invention
The invention provides a kind of injection well pipe column organic acid scale remover.
The present invention adopts following technical scheme:
Injection well pipe column organic acid scale remover of the present invention is made up of the raw material of following weight percent: organic acid 7-18%, inhibiter 1-3%, permeate agent 1-5%, all the other are water.Preferably be made up of the raw material of following weight percent: organic acid 15%, inhibiter 2%, permeate agent 2.6%, all the other are for water.
Described organic acid is made up of thionamic acid and solid nitric acid, and the weight percent that both account for scale remover is as follows: thionamic acid 2-8%, solid nitric acid 5-10%.The weight percent accounting for scale remover is preferably as follows: thionamic acid 5%, solid nitric acid 10%.
Described inhibiter is inhibiter LJ-1, and inhibiter LJ-1 is the compound of vulkacit H and methylparafynol, and composite part by weight is 1:1.
Described permeate agent is permeate agent LJ-2, and permeate agent LJ-2 is take polyethylene polyamine as the polyoxyethylene polyoxypropylene polyethers of initiator and the compound of cation Gemini surfactant C16-4-C16, and composite part by weight is 3:7.
Positively effect of the present invention is as follows:
Organic acid scale remover of the present invention is at temperature 50 C, and during reaction times 12h, be greater than 85% to the descaling rate of calcium carbonate scale, be greater than 50% to the descaling rate of calcium sulfate scale, be less than 2.0g/m2.h to the erosion rate of N-80 steel disc, corrosion inhibition rate is greater than 90%.13 mouthfuls of water injection wells that when testing on-site layering, instrument is hampered, according to preferred organic acid scale remover formula, through organic acid scale remover to after tubing string scale removal, testing tool homogeneous subnormal under enter, complete water injection well layering test assignment.
Embodiment
The following examples describe in further detail of the present invention.
Embodiment 1
Injection well pipe column organic acid scale remover of the present invention is made up of the raw material of following weight percent: organic acid 7%, inhibiter 3%, permeate agent 1%, all the other are water.
Described organic acid is made up of thionamic acid and solid nitric acid, and the weight percent that both account for scale remover is as follows: thionamic acid 2%, solid nitric acid 5%.
Described inhibiter is inhibiter LJ-1, and inhibiter LJ-1 is the compound of vulkacit H and methylparafynol, and composite part by weight is 1:1.
Described permeate agent is permeate agent LJ-2, and permeate agent LJ-2 is take polyethylene polyamine as the polyoxyethylene polyoxypropylene polyethers of initiator and the compound of cation Gemini surfactant C16-4-C16, and composite part by weight is 3:7.
Embodiment 2
Injection well pipe column organic acid scale remover of the present invention is made up of the raw material of following weight percent: organic acid 18%, inhibiter 1%, permeate agent 5%, all the other are water.
Described organic acid is made up of thionamic acid and solid nitric acid, and the weight percent that both account for scale remover is as follows: thionamic acid 8%, solid nitric acid 10%.
Described inhibiter is inhibiter LJ-1, and inhibiter LJ-1 is the compound of vulkacit H and methylparafynol, and composite part by weight is 1:1.
Described permeate agent is permeate agent LJ-2, and permeate agent LJ-2 is take polyethylene polyamine as the polyoxyethylene polyoxypropylene polyethers of initiator and the compound of cation Gemini surfactant C16-4-C16, and composite part by weight is 3:7.
Embodiment 3
Injection well pipe column organic acid scale remover of the present invention is made up of the raw material of following weight percent: organic acid 15%, inhibiter 2%, permeate agent 2.6%, all the other are water.
Described organic acid is made up of thionamic acid and solid nitric acid, and the weight percent that both account for scale remover is as follows: thionamic acid 5%, solid nitric acid 10%.
Described inhibiter is inhibiter LJ-1, and inhibiter LJ-1 is the compound of vulkacit H and methylparafynol, and composite part by weight is 1:1.
Described permeate agent is permeate agent LJ-2, and permeate agent LJ-2 is take polyethylene polyamine as the polyoxyethylene polyoxypropylene polyethers of initiator and the compound of cation Gemini surfactant C16-4-C16, and composite part by weight is 3:7.
(1) selection of organic acid concentration
Change organic acid concentration, evaluate the organic acid scale remover descaling rate to calcium carbonate scale and calcium sulfate scale, experimental temperature 50 DEG C, reaction times 12h.Data are as shown in table 1.
Table 1 organic acid concentration is on the impact of descaling rate
| Organic acid concentration, % | Calcium carbonate scale descaling rate, % | Calcium sulfate scale descaling rate, % |
| 5 | 45.3 | 26.7 |
| 10 | 75.9 | 39.8 |
| 15 | 85.2 | 51.6 |
| 20 | 86.7 | 53.0 |
From table 1, with the increase of organic acid concentration, the descaling rate of scale remover to calcium carbonate scale and calcium sulfate scale increases gradually.After organic acid concentration is greater than 15%, with the increase of organic acid concentration, scale removal efficiency increases to some extent, but increase trend slows down.Therefore, determine that in scale remover, organic acid concentration is 15%, is greater than 85% to the descaling rate of calcium carbonate scale, is greater than 50% to the descaling rate of calcium sulfate scale.
(2) temperature of reaction is on the impact of descaling rate
Reaction times 12h, investigates at different temperature, and organic acid scale remover is to the descaling rate of calcium carbonate scale and calcium sulfate scale, and data are as shown in table 2.
The descaling rate of organic acid scale remover under table 2 differing temps
| Temperature of reaction, DEG C | Calcium carbonate scale descaling rate, % | Calcium sulfate scale descaling rate, % |
| 30 | 72.1 | 45.7 |
| 40 | 80.3 | 49.8 |
| 50 | 85.2 | 51.9 |
| 60 | 86.9 | 53.2 |
From table 2, with the increase of temperature of reaction, the descaling rate of organic acid scale remover to calcium carbonate scale and calcium sulfate scale increases to some extent, but it is slow to increase trend, shows that the descaling rate impact of temperature on organic acid scale remover is less.
(3) reaction times is on the impact of descaling rate
Experimental temperature 50 DEG C, under investigating different dissolution time, organic acid scale remover is to the descaling rate of calcium carbonate scale and calcium sulfate scale, and data are as shown in table 3.
The descaling rate of organic acid scale remover under the table 3 differential responses time
| Reaction times, h | Calcium carbonate scale descaling rate, % | Calcium sulfate scale descaling rate, % |
| 6 | 42.8 | 34.7 |
| 12 | 85.7 | 52.7 |
| 18 | 89.9 | 57.5 |
| 24 | 91.6 | 59.3 |
From table 3, descaling rate increases in time and increases, and initial reaction speed, reaches balance after 12h substantially, and descaling rate almost no longer increases.
(4) corrosion inhibition rate of organic acid scale remover
Select N-80 steel disc, steel disc etching time 12h, experimental temperature 50 DEG C.The industry standard SY/T 5405-1996 " acidifying inhibiter method for testing performance and evaluation index " that corrosion inhibition Appreciation gist China National Petroleum Corporation (CNPC) promulgates carries out.Experimental result is in table 4.
The corrosion inhibition rate of table 4 organic acid scale remover
| Inhibiter LJ-1 dosage, % | Corrosion speed, g/m 2.h | Corrosion inhibition rate, % |
| 1.0 | 4.31 | 62.5 |
| 1.5 | 2.19 | 85.4 |
| 2.0 | 1.75 | 92.9 |
| 2.5 | 1.59 | 93.8 |
From table 4, with the increase of inhibiter LJ-1 dosage, the erosion rate of scale remover reduces greatly, and when inhibiter LJ-1 dosage 2.0%, the erosion rate of scale remover is less than 2.0g/m
2.h, corrosion inhibition rate is greater than 90%.
(5) field conduct
The water injection well that when selecting on-site layering to test, instrument is hampered, according to preferred organic acid scale remover formula, 5 side's scale removers prepared by every mouthful of well, inject into well with pump truck.Close well head, reaction 12h.After driving a well, test jobs can be carried out.To recover the oil two factory's test in places, 13 mouthfuls of wells at Daqing oil field, after scale removal, enter under testing tool is normal, completed zonation test task.Test pound sign is in table 5.
Table 5 test in place well situation
Contrast with employing conventional lift pipe string scale removal operation, organic acid scale remover site construction technology is simple, and the required personnel of construction, equipment are few, and labour intensity of constructing is low, and the engineering time is short.
Although illustrate and describe embodiments of the invention, for the ordinary skill in the art, be appreciated that and can carry out multiple change, amendment, replacement and modification to these embodiments without departing from the principles and spirit of the present invention, scope of the present invention is by claims and equivalents thereof.
Claims (6)
1. an injection well pipe column organic acid scale remover, is characterized in that: described scale remover is made up of the raw material of following weight percent: organic acid 7-18%, inhibiter 1-3%, permeate agent 1-5%, all the other are water.
2. injection well pipe column organic acid scale remover as claimed in claim 1, is characterized in that: described scale remover is made up of the raw material of following weight percent: organic acid 15%, inhibiter 2%, permeate agent 2.6%, all the other are water.
3. injection well pipe column organic acid scale remover as claimed in claim 1, it is characterized in that: described organic acid is made up of thionamic acid and solid nitric acid, the weight percent that both account for scale remover is as follows: thionamic acid 2-8%, solid nitric acid 5-10%.
4. injection well pipe column organic acid scale remover as claimed in claim 2, it is characterized in that: described organic acid is made up of thionamic acid and solid nitric acid, the weight percent that both account for scale remover is as follows: thionamic acid 5%, solid nitric acid 10%.
5. injection well pipe column organic acid scale remover as claimed in claim 1 or 2, it is characterized in that: described inhibiter is inhibiter LJ-1, inhibiter LJ-1 is the compound of vulkacit H and methylparafynol, and composite part by weight is 1:1.
6. injection well pipe column organic acid scale remover as claimed in claim 1 or 2, it is characterized in that: described permeate agent is permeate agent LJ-2, permeate agent LJ-2 is take polyethylene polyamine as the polyoxyethylene polyoxypropylene polyethers of initiator and the compound of cation Gemini surfactant C16-4-C16, and composite part by weight is 3:7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510089699.8A CN104745167A (en) | 2015-02-27 | 2015-02-27 | Organic acid antiscaling agent for tubular column of water injection well |
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| CN201510089699.8A CN104745167A (en) | 2015-02-27 | 2015-02-27 | Organic acid antiscaling agent for tubular column of water injection well |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109534520A (en) * | 2018-11-12 | 2019-03-29 | 深圳大学 | A kind of dish-washing machine Special scale remover and preparation method thereof |
| CN114085658A (en) * | 2021-11-20 | 2022-02-25 | 郑玉坤 | Formula of oilfield downhole tubular column descaling agent |
| CN115182703A (en) * | 2021-04-07 | 2022-10-14 | 中国石油化工股份有限公司 | Gas well descaling and blockage removing method and solid descaling and blockage removing agent for gas production |
-
2015
- 2015-02-27 CN CN201510089699.8A patent/CN104745167A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109534520A (en) * | 2018-11-12 | 2019-03-29 | 深圳大学 | A kind of dish-washing machine Special scale remover and preparation method thereof |
| CN115182703A (en) * | 2021-04-07 | 2022-10-14 | 中国石油化工股份有限公司 | Gas well descaling and blockage removing method and solid descaling and blockage removing agent for gas production |
| CN114085658A (en) * | 2021-11-20 | 2022-02-25 | 郑玉坤 | Formula of oilfield downhole tubular column descaling agent |
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Application publication date: 20150701 |
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