CN102358834A - Solid descaling acid rod for oil well - Google Patents
Solid descaling acid rod for oil well Download PDFInfo
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- CN102358834A CN102358834A CN2011102193363A CN201110219336A CN102358834A CN 102358834 A CN102358834 A CN 102358834A CN 2011102193363 A CN2011102193363 A CN 2011102193363A CN 201110219336 A CN201110219336 A CN 201110219336A CN 102358834 A CN102358834 A CN 102358834A
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- scale removal
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Abstract
The present invention discloses a solid descaling acid rod for an oil well. The rod comprises a main acid, a cementing agent, a weighting agent and a water-absorbent resistant agent. The main acid comprises: a solid acid, a penetrant, a corrosion inhibitor and a cleaning agent. In the prior art, the scale remover for the oil well has the following defects that: the strong acid in the scale remover has strong corrosion and strong irritation, the scale remover is inconvenient to produce and use, and the like. With the acid rod provided by the present invention, the defects in the prior art are solved. Compared to the conventional scale removers, the solid descaling acid rod provided by the present invention has advantages of strong solubility, weak acidity and the like, can effectively removing the scale, and does not cause corrosion to the pipe string and packer rubber.
Description
Technical field
What the present invention relates to is that oil well is used scale remover, and concrete is the scale remover of a kind of principal constituent for acid.
Background technology
The wax deposition of the similar crude oil of fouling of oil-field water is the problem that will run into inevitably in the field produces.Along with the increase that water is produced in the oil field, it is more and more outstanding that scale problems becomes.
Modal dirt is calcium carbonate scale, calcium sulfate dirt, strontium sulfate scale and barium sulfate scale in the oil field.Fouling brings many harm to production, as the fouling meeting causes that water injection pressure raises and oilwell produced fluid amount reduces on the stratum, can cause at pipeline scaling and stop up and localized corrosion problems.
Conventional scale remover succeed in developing the good demand that solves the oil well scale removal, but in application process, also exist severe corrosive, strong and stimulating and the production of strong acid to use defectives such as inconvenience.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of oil well with solid scale removal acid rod, the deficiency of having avoided conventional scale remover to exist, and effectively scale removal, and can not corrode tubing string, packing element.
A kind of oil well provided by the invention is with solid scale removal acid rod, and its composition comprises main acid, jointing compound, weighting agent, anti-water-retaining agent; Said main acid comprises: solid acid, permeate agent, inhibiter, clean-out system.
Jointing compound adopted Xylo-Mucine (CMC) during above-mentioned solid scale removal acid rod was formed, and weighting agent adopts zinc bromide ZnBr
2, anti-water-retaining agent adopts cationic polyacrylamide, and solid acid comprises thionamic acid, nitric acid powder, YD 30 (EDTA), and the permeate agent employing polymerization degree is 30 peregal, and inhibiter adopts thiocarbamide, and clean-out system adopts X 2073.
Said oil well is respectively according to weight percent with each components contents of solid scale removal acid rod: solid acid is 88.4%; Thiocarbamide is 1.8%; X 2073 is 1.8%, and the polymerization degree is that 30 peregal is 3.6%, and Xylo-Mucine is 0.2%; Zinc bromide is 4%, and cationic polyacrylamide is 0.2%; Wherein thionamic acid is 33% in 88.4% the solid acid, and nitric acid powder is 25%, and YD 30 is 30.4%.
Above-mentioned oil well is with the preparation method of solid scale removal acid rod:
1, at first prepare the main acid part:
According to prescription, take by weighing thionamic acid powder, nitric acid powder, YD 30 powder, the polymerization degree respectively and be 30 peregal, thiocarbamide powder and X 2073 powder, then said components is mixed and stir;
2, preparation acid rod:
According to prescription, take by weighing Xylo-Mucine, zinc bromide and cationic polyacrylamide respectively, then said components is joined in the main acid of step 1 preparation, put into pressing machine after stirring and be pressed.
Oil well of the present invention is compared with conventional scale remover with solid scale removal acid rod; Shortcomings such as inconvenience are used in the severe corrosive, strong and stimulating and the production that have overcome strong acid; Kept advantages such as its strong solubility, slightly acidic, made its effectively scale removal, and do not corrode with tubing string, packing element.Solid scale removal of the present invention acid rod staging life is greater than 150 days, can satisfy on-the-spot dispenser band and press and throw in, and removes to be hampered success ratio more than 80%.
Embodiment
Embodiment 1
Oil well is with the preparation of solid scale removal acid rod:
Oil well is with solid scale removal acid rod, and its composition comprises main acid, jointing compound, weighting agent, anti-water-retaining agent; Said main acid comprises:
Thionamic acid, nitric acid powder, YD 30 (EDTA), permeate agent, inhibiter, clean-out system.
Said jointing compound adopts Xylo-Mucine (CMC), and weighting agent adopts zinc bromide ZnBr
2, anti-water-retaining agent adopts cationic polyacrylamide, and the permeate agent employing polymerization degree is 30 peregal, and inhibiter adopts thiocarbamide, and clean-out system adopts X 2073.
Said oil well is respectively according to weight percent with the composition of solid scale removal acid rod: solid acid is 88.4%; Thiocarbamide is 1.8%; X 2073 is 1.8%, and the polymerization degree is that 30 peregal is 3.6%, and Xylo-Mucine is 0.2%; Zinc bromide is 4%, and cationic polyacrylamide is 0.2%; Thionamic acid 33% in 88.4% the solid acid wherein, nitric acid powder 25%, YD 30 30.4%.
Above-mentioned oil well is with the preparation method of solid scale removal acid rod:
1, at first prepare the main acid part:
According to prescription, take by weighing thionamic acid powder, nitric acid powder, YD 30 powder, the polymerization degree respectively and be 30 peregal, thiocarbamide powder and X 2073 powder, then said components is mixed, and stir;
2, preparation acid rod:
According to prescription; Take by weighing Xylo-Mucine, zinc bromide and cationic polyacrylamide respectively, then said components is joined in the main acid of step 1 preparation, put into pressing machine after stirring and suppress; The excellent moulding length of acid is 300mm, and diameter is 40mm.
Embodiment 2: temperature of reaction is to the influence of scale removal efficient
Select the prepared solid scale removal acid rod of embodiment 1, investigate under different temperature, solid scale removal acid rod is to calcium carbonate scale and the dirty scale removal efficient of calcium sulfate, and the reaction times is 24h.The test result such as the following table 1 of the solid scale removal acid rod of present embodiment:
The meltage of solid scale removal acid rod under table 1 differing temps
| Temperature of reaction, ℃ | Calcium carbonate scale scale removal efficient, % | Calcium sulfate dirt scale removal efficient, % |
| 25 | 72.1 | 45.9 |
| 40 | 81.3 | 68.4 |
| 50 | 86.2 | 81..9 |
| 60 | 88.9 | 85.2 |
| 70 | 89.7 | 88.1 |
By visible in the table, with the increase of temperature of reaction, scale removal efficient increases, and temperature is high more, and the scale removal efficient of calcium carbonate scale increases, and for the calcium sulfate dirt, because it is poorly soluble, its dirty dissolving power is less than calcium carbonate scale, and scale removal efficient also is lower than calcium carbonate scale.
Embodiment 2: the reaction times is dissolved the influence of dirty ability to scale removal acid rod
Select the prepared solid scale removal acid rod of embodiment 1, the simulation dirt carries out the molten dirty rate of different dissolution times under 50 ℃ measures, and investigates the scale removal efficient of scale removal acid rod.The test result such as the following table 2 of the oil well solid scale removal acid rod of present embodiment:
The molten dirty rate of table 2 differential responses time solid scale removal acid rod
| Reaction times, h | Calcium carbonate scale scale removal efficient, % | Calcium sulfate dirt scale removal efficient, % |
| 5 | 52.9 | 51.9 |
| 10 | 61.6 | 63.1 |
| 15 | 71.9 | 61.8 |
| 20 | 75.8 | 70.1 |
| 24 | 81.9 | 71.9 |
| 36 | 84.2 | 74.6 |
| 48 | 85.1 | 81.7 |
Found out by experimental result: solid scale removal acid rod dissolves dirty rate to be increased in time and increases, initial reaction rapid speed, particularly CaS0
4The dirt reaction is very fast, has reached more than 50% in molten dirty rate about 5h; Basically reach balance behind the 15h, dissolving dirty rate almost no longer increases.This is to belong to fast response owing to this complex reaction, carries out with reaction, and complexing dosage reduces very soon so that all consumes, and no longer includes the dirty ability of dissolving, so scale removal immersion 48h is just enough.
Embodiment 3: the compatibleness of solid scale removal acid rod and other treatment agent
In handling oilfield sewage; Except scale remover; Also contain a lot of oilfield additives; Like emulsion splitter, inhibiter, sterilant etc., select oil field sterilant TQ-1, inhibition scale remover ATMP, clay stabilizer FL and flocculation agent PC commonly used and embodiment 1 prepared solid scale removal acid rod to carry out the compatibleness experiment.Descaling rate is the descaling rate of carbonate, and sterilizing rate is according to the method test of oil and gas industry standard SY/T5890-93 regulation, and corrosion inhibition rate is according to the method test of oil and gas industry standard SY/T5273-91 regulation.The test result of the solid scale removal acid rod of present embodiment is as shown in table 3.
The compatibleness of table 3 solid scale removal acid rod and other treatment agent
By visible in the table; After adding other treatment agent, the descaling rate of scale removal acid rod is constant basically, and the various performances of other treatment agent do not change yet; Therefore, scale removal acid rod has excellent compatibility with flocculation agent PC, sterilant TQ-1, inhibition scale remover ATMP and clay stabilizer FL.
Embodiment 4: the excellent test in place evaluation of solid scale removal acid
The processing of solid scale removal acid rod: according to the prescription of the scale remover of determining, be processed into the solid acid rod, specification is φ 40mm * 300mm.Pack and be transported to the well site.
At the scene, close sluice gate and produce gate, adorn dispenser after the emptying.Close two valves up and down of dispenser, open the production valve, after opening fully, slowly open the lower valve of dispenser, after being full of fully in the dispenser, close the dispenser lower valve; Open pressure release valve and put pressure, open valve on the dispenser then, drop into 5 of solid acid rods, close valve and pressure release valve on the dispenser, open the dispenser lower valve solid acid rod is dropped in the well; The acid rod falls in tubing string under action of gravity, and this process that circulates adds the solid acid rod by design acid amount.After input finished, the shut-in well port strobe made the complete and acid liquid reaction of incrustation scale in the tubing string.Anti-flushing well behind the reaction 72h washes out acid solution in the well and insoluble dirty slag in pit shaft.Test jobs is carried out in the normal water filling that drives a well.The test result of the well cementation solid scale removal acid rod of present embodiment is as shown in table 4 below.
Table 4 on-site solids s.t. dirt resistance test situation
| Sequence number | Pound sign | Result | Sequence number | Pound sign | Result |
| 1 | Rise 26-18 | Handle successfully | 9 | Virtue 20-oblique 55 | Handle successfully |
| 2 | Rise 32-30 | Handle successfully | 10 | Virtue 23-52 | Handle successfully |
| 3 | 89-98 forever | Be untreated successfully | 11 | Rise 40-040 | Handle successfully |
| 4 | 42-88 forever | Be untreated successfully | 12 | Virtue 110-126 | Handle successfully |
| 5 | Virtue 10-62 | Handle successfully | 13 | Start 52-40 | Handle successfully |
| 6 | Virtue 26-oblique 52 | Handle successfully | 14 | Start 194-124 | Handle successfully |
| 7 | Virtue 12-oblique 64 | Handle successfully | 15 | Rise 76-42 | Handle successfully |
| 8 | Virtue 18-oblique 57 | Handle successfully | 16 | Rise 36-16 | Handle successfully |
16 mouthfuls of wells of test in place are the water injection allocator test of tubing string bottom and are hampered, and it is invalid that well-flushing is handled.Input solid acid rod, closing well dissolved dirt back anti-flushing well in 3 days, test once more, and wherein 14 mouthfuls of wells are successfully separated resistance, have avoided the reprovision operation, and removing the success ratio that is hampered is 87.5%.
This solid scale removal acid rod is compared with conventional scale remover, and (the solid acid rod takes up room little, avoids perishable tubing string and packing element to have overcome severe corrosive, the strong and stimulating of strong acid; Product all is soluble salts; No secondary sedimentation, less to formation contaminant) and produce shortcomings such as using inconvenience, kept advantages such as its strong solubility, slightly acidic; Make its effectively scale removal, and do not corrode with tubing string, packing element.
Claims (2)
1. an oil well is with solid scale removal acid rod, and its composition comprises main acid, jointing compound, weighting agent, anti-water-retaining agent; Said main acid comprises: solid acid, permeate agent, inhibiter, clean-out system; Said solid acid comprises thionamic acid, nitric acid powder, YD 30; Jointing compound adopted Xylo-Mucine during above-mentioned solid scale removal acid rod was formed; Weighting agent adopts zinc bromide, and anti-water-retaining agent adopts cationic polyacrylamide, and the permeate agent employing polymerization degree is 30 peregal; Inhibiter adopts thiocarbamide, and clean-out system adopts X 2073; Said oil well is respectively according to weight percent with each components contents of solid scale removal acid rod: solid acid is 88.4%; Xylo-Mucine is 0.2%; Zinc bromide is 4%, and cationic polyacrylamide is 0.2%, and the polymerization degree is that 30 peregal is 3.6%; Thiocarbamide is 1.8%, and dodecylbenzene naphthenic acid sodium is 1.8%; Wherein thionamic acid is 33% in 88.4% the solid acid, and nitric acid powder is 25%, and YD 30 is 30.4%.
2. above-mentioned oil well the steps include: with the preparation method of solid scale removal acid rod
(1), at first prepare the main acid part:
According to prescription, take by weighing thionamic acid powder, nitric acid powder, YD 30 powder, the polymerization degree respectively and be 30 peregal, thiocarbamide powder and dodecylbenzene naphthenic acid sodium powder, then said components is mixed and stir;
(2), preparation acid rod:
According to prescription, take by weighing Xylo-Mucine, zinc bromide and cationic polyacrylamide respectively, then said components is joined in the main acid of step 1 preparation, put into pressing machine after stirring and be pressed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110219336 CN102358834B (en) | 2011-08-02 | 2011-08-02 | Solid descaling acid rod for oil well |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110219336 CN102358834B (en) | 2011-08-02 | 2011-08-02 | Solid descaling acid rod for oil well |
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| Publication Number | Publication Date |
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| CN102358834A true CN102358834A (en) | 2012-02-22 |
| CN102358834B CN102358834B (en) | 2013-03-20 |
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| CN 201110219336 Expired - Fee Related CN102358834B (en) | 2011-08-02 | 2011-08-02 | Solid descaling acid rod for oil well |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015041538A1 (en) * | 2013-09-17 | 2015-03-26 | Jupa As | Acid block and method of local acid treatment of subsea connecting element |
| CN106281273A (en) * | 2015-05-15 | 2017-01-04 | 中国石油天然气股份有限公司 | A kind of acid fluid system for being acidified carbonate reservoir |
| CN111574982A (en) * | 2020-06-15 | 2020-08-25 | 南京市美泰鑫能源材料科技有限公司 | Self-soluble composite material with anti-corrosion and descaling functions and preparation method thereof |
| CN111748424A (en) * | 2020-07-03 | 2020-10-09 | 西安热工研究院有限公司 | Preparation method of hydropower station pipe-laying high-silica scale acid cleaning ball |
| 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 |
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| CN101089118A (en) * | 2006-06-16 | 2007-12-19 | 长江大学 | Acidifying agent composition |
| CN101671552A (en) * | 2009-09-28 | 2010-03-17 | 大庆油田有限责任公司 | Silicate scale clearing agent for ternary combination flooding extraction well |
| US20110168395A1 (en) * | 2009-07-30 | 2011-07-14 | Halliburton Energy Services, Inc. | Methods of Fluid Loss Control and Fluid Diversion in Subterranean Formations |
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2011
- 2011-08-02 CN CN 201110219336 patent/CN102358834B/en not_active Expired - Fee Related
Patent Citations (3)
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| CN101089118A (en) * | 2006-06-16 | 2007-12-19 | 长江大学 | Acidifying agent composition |
| US20110168395A1 (en) * | 2009-07-30 | 2011-07-14 | Halliburton Energy Services, Inc. | Methods of Fluid Loss Control and Fluid Diversion in Subterranean Formations |
| CN101671552A (en) * | 2009-09-28 | 2010-03-17 | 大庆油田有限责任公司 | Silicate scale clearing agent for ternary combination flooding extraction well |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015041538A1 (en) * | 2013-09-17 | 2015-03-26 | Jupa As | Acid block and method of local acid treatment of subsea connecting element |
| GB2533749A (en) * | 2013-09-17 | 2016-06-29 | Jupa As | Acid block and method of local acid treatment of subsea connecting element |
| NO340820B1 (en) * | 2013-09-17 | 2017-06-26 | Jupa As | Acid block and method for local acid treatment of subsea connection element |
| US10041334B2 (en) | 2013-09-17 | 2018-08-07 | Jupa As | Acid block and method of local acid treatment of subsea connecting element |
| GB2533749B (en) * | 2013-09-17 | 2020-09-16 | Jupa As | Acid block and method of local acid treatment of subsea connecting element |
| CN106281273A (en) * | 2015-05-15 | 2017-01-04 | 中国石油天然气股份有限公司 | A kind of acid fluid system for being acidified carbonate reservoir |
| CN106281273B (en) * | 2015-05-15 | 2019-09-06 | 中国石油天然气股份有限公司 | It is a kind of for being acidified the acid fluid system of carbonate reservoir |
| CN111574982A (en) * | 2020-06-15 | 2020-08-25 | 南京市美泰鑫能源材料科技有限公司 | Self-soluble composite material with anti-corrosion and descaling functions and preparation method thereof |
| CN111748424A (en) * | 2020-07-03 | 2020-10-09 | 西安热工研究院有限公司 | Preparation method of hydropower station pipe-laying high-silica scale acid cleaning ball |
| CN111748424B (en) * | 2020-07-03 | 2021-09-21 | 西安热工研究院有限公司 | Preparation method of hydropower station pipe-laying high-silica scale acid cleaning ball |
| 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 |
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| CN102358834B (en) | 2013-03-20 |
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