CN104789200A - Blockage removal agent for barite pollution of oil-gas well - Google Patents
Blockage removal agent for barite pollution of oil-gas well Download PDFInfo
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- CN104789200A CN104789200A CN201510165533.XA CN201510165533A CN104789200A CN 104789200 A CN104789200 A CN 104789200A CN 201510165533 A CN201510165533 A CN 201510165533A CN 104789200 A CN104789200 A CN 104789200A
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- oil
- gas well
- barite
- agent
- pollutes
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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
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- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Abstract
The invention discloses a blockage removal agent for barite pollution of an oil-gas well. The blockage removal agent comprises 7%-8% of a composite chelating ligand, 3%-4% of a pH (potential of hydrogen) modifier, 0.5%-1% of a corrosion synergist, 0.5%-1% of a clay stabilizer, a 0.5%-1% of an oxidant and water, wherein the composite chelating ligand is formed by mixing and compounding two or three of amino triphosphate, ethylenediamine tetraacetic acid disodium salt, amidogen oxalic acid and amino triacetate. A preparation method of the blockage removal agent for barite pollution of the oil-gas well is simple, the composite chelating ligand and the oxidant are added to water in a proportion, stirred until solids are fully dissolved, then the pH modifier is added, and the pH value of a mixed solution is adjusted to be 12-14. The blockage removal agent for barite pollution of the oil-gas well has a wide application prospect, can be directly applied to production as a completion fluid to remove blockage of the oil-gas well completely and improve the production efficiency of the oil-gas well, and meanwhile, can be applied to old well reconstruction as a workover fluid to solve the problem of reduction of production efficiency as a result of blockage of reservoir strata of an old well after years of production.
Description
Technical field
The invention belongs to the additive agent field of in oilfield stimulation process, Oil/gas Well being carried out to de-plugging, particularly a kind of Oil/gas Well barite pollutes unblocking agent.
Background technology
Along with the increase of oil-gas exploration and development difficulty, increasing deep-well, ultra deep well are drilled to be leant out.Bore inevitable floor height pressure concomitantly in deep-well process, therefore need in drilling fluid, add high-density weighting material and carry out equilibrium strata pressure with the density improving drilling fluid, prevent the drilling failure such as well kick, blowout.Barite weighting agent is high-density weighting material conventional in high density drilling fluid.But can not be dissolved in drilling fluid due to it, be easy to sedimentation occurs in drilling process, cause the blocking of stratum natural fracture, pollute stratum, after causing bringing in a well, gas channel is smooth, affects output and recovery ratio.
Bar main component barium sulfate solubleness in the aqueous solution and acid solution is very little, adopts the method for acidifying to be removed.In addition, the ground barium sulfate surface of causing Oil/gas Well gap to block generally is enclosed with the residue of organic polymer compounds in drilling fluid, cannot be exposed in general reservoir reconstruction liquid, more makes it be dissoluted difficulty and strengthens.As the difficult problem existed in industry always, less for the unblocking agent achievement in research removing barite pollution specially.
Summary of the invention
The object of the present invention is to provide a kind of corrosion barite to remove the pollution that in drilling process, barite causes, link up hydrocarbon zone and improve oil and water well output Oil/gas Well barite pollute unblocking agent.
To achieve these goals, Oil/gas Well barite of the present invention pollutes unblocking agent, is prepared from by the component of following weight percent:
Wherein, it is corrosion barite main component that described composite chelate part pollutes in unblocking agent at this Oil/gas Well barite, chelating ligand is as forming with metal ion the organism that coordinate bond builds ring compound, the ring compound formed is more stable, can the structure of coordination more, coordination ability is stronger, the easier precipitation effectively removing the metal ions such as barium, calcium, magnesium, thus realizes the function removing the pollution of oil well barite.Adopt the method for the composite use of multiple chelating ligand can improve bar corrosion amount, increase solution ration.
Preferably, described composite chelate part is that two or three in amino triphosphoric acid, disodium ethylene diamine tetraacetate, aminodiacetic acid, nitrilotriacetic acid compositely forms.
More preferably, described composite chelate part be amino triphosphoric acid, disodium ethylene diamine tetraacetate and nitrilotriacetic acid in mass ratio 3:2:2 mix; Or amino triphosphoric acid and disodium ethylene diamine tetraacetate in mass ratio 3:4 mix; Or amino triphosphoric acid and nitrilotriacetic acid in mass ratio 3:4 mix; Or aminodiacetic acid and nitrilotriacetic acid in mass ratio 1:1 mix.
Described pH adjusting agent is inorganic metal alkaloid compound, and preferably, described pH adjusting agent is sodium hydroxide, sodium carbonate or potassium hydroxide.This compounds can regulation system pH value to increase the solubleness of chelating ligand and chelate products, thus increase bar solution ration.
The solubleness added for improving barium sulfate of described corrosion synergistic agent.Described corrosion synergistic agent is nitrate, is preferably KNO
3or NaNO
3, utilize the counterion effect of nitrate salt effect in aqueous and nitrate radical can increase the solubleness of barium sulfate in water, thus improve corrosion effect as far as possible.
Preferably, described clay stabilizer is Repone K, and adding of Repone K can be adsorbed on surface of clay effectively, prevents the injury that water sensitivity mineral hydration swelling and dispersion are migrated and caused hydrocarbon zone.
Described oxygenant is the mineral compound possessing oxidation capacity, preferably, and described oxidizing agent sodium hypochlorite, Losantin or dioxide peroxide.This compounds can be oxidized in drilling well residue and wrap up bar organic polymer compounds, remove in drilling fluid and remain superpolymer to bar encapsulation action, thus make the easier corrosion of barite in the aqueous solution, thus remove the pollution that drilling fluid weighting agent causes hydrocarbon zone as far as possible.
It is simple that this Oil/gas Well barite pollutes unblocking agent preparation method, composite chelate part and oxygenant is added to the water in proportion, is stirred to after solid fully dissolves and adds pH value regulator, regulates mixing solutions pH to 12 ~ 14.
This Oil/gas Well barite pollutes the using method of unblocking agent: the unblocking agent that will prepare under a little more than fracture open pressure 3 ~ 5Mpa injects service shaft, or with injecting the well section of required process after pkr segmentation, and closing well is after 4 hours, discharge opeing.
Compared with prior art, this Oil/gas Well barite pollutes unblocking agent:
(1) use this Oil/gas Well barite to pollute unblocking agent barite corrosion rate amount 90 DEG C time and can reach 4g/L, and significantly increase along with its corrosion speed of increase of temperature;
(2) this Oil/gas Well barite pollution unblocking agent can be used as well finishing liquid and workover fluid as reservoir reconstruction liquid, can not only remove the pollution that barite causes, and can also remove calcium sulfate, Strontium Sulphate and calcium carbonate etc. other pollutes the blocking caused simultaneously;
(3) this Oil/gas Well barite pollutes unblocking agent can solve a recessive acid acid etching difficult problem as well finishing liquid use, corrosion-free to tubing string;
(4) this Oil/gas Well barite pollute that unblocking agent each component is all nontoxic, safety, environmental protection;
In sum, it is extensive that this Oil/gas Well barite pollutes unblocking agent application prospect, can directly be applied in production operation as well finishing liquid, thoroughly removes Oil/gas Well tamper, improves the operation efficiency of Oil/gas Well; Equally also can be used as workover fluid and be applied to old well reform, solving old well because producing reservoir blocking for many years, the problem that production efficiency declines.
Accompanying drawing explanation
Fig. 1 is the change of Oil/gas Well barite unblocking agent of the present invention corrosion amount when changing with system pH 90 DEG C time;
Fig. 2 is Oil/gas Well barite unblocking agent of the present invention corrosion amount change at different temperatures.
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
Amino for 30kg triphosphoric acid (the 50wt% aqueous solution), 10kg disodium ethylene diamine tetraacetate, 10kg nitrilotriacetic acid, 5kg saltpetre, 3kg Repone K, 6kg clorox are added in 600Kg water respectively, be stirred to after solid fully dissolves and add 25kg sodium hydroxide, mix.
Embodiment 2
Amino for 30kg triphosphoric acid (the 50wt% aqueous solution), 20kg disodium ethylene diamine tetraacetate, 5kg saltpetre, 3kg Repone K, 6kg clorox are added in 600Kg water respectively, is stirred to after solid fully dissolves and adds 25kg sodium hydroxide.
Embodiment 3
Amino for 30kg triphosphoric acid (the 50wt% aqueous solution), 20kg nitrilotriacetic acid, 5kg saltpetre, 3kg Repone K, 6kg clorox are added in 600Kg water respectively, is stirred to after solid fully dissolves and adds 25kg sodium hydroxide, mix.
Embodiment 4
20kg aminodiacetic acid, 20kg nitrilotriacetic acid, 5kg saltpetre, 3kg Repone K, 6kg clorox are added in 600Kg water respectively, is stirred to after solid fully dissolves and adds 25kg sodium hydroxide, mix.
Embodiment 5
The Oil/gas Well barite selecting embodiment 1 to prepare pollutes unblocking agent and carries out following experiment, and wherein, only the content of sodium hydroxide is different from ratio in embodiment 1, is intended to probe into the optimum PH range that this Oil/gas Well barite pollutes unblocking agent use.
2g drilling well ground barium sulfate is added respectively in 8 beakers, and respectively the 100mL Oil/gas Well barite of pH=7, pH=8, pH=9, pH=10, pH=11, pH=12, pH=13 and pH=14 is polluted unblocking agent, 8 beakers are put into the water-bath that temperature is 90 DEG C, after low rate mixing 4h, its corrosion rate at 90 DEG C is measured.Record the relation of corrosion rate and temperature as shown in Figure 1, as can be seen from Figure 1, the corrosion rate that Oil/gas Well barite pollutes unblocking agent is that in 12 ~ 14 scopes, corrosion rate reaches 4g/L at pH, and reaches the highest when pH is 13.
Embodiment 6
2g drilling well ground barium sulfate is added respectively in 5 beakers, and pollute unblocking agent (pH=12) respectively to the Oil/gas Well barite adding 100mL embodiment 1 preparation in 5 beakers, 5 beakers are put into the water-bath that temperature is 50 DEG C, 60 DEG C, 70 DEG C, 80 DEG C and 90 DEG C respectively, leave standstill after 4h, its corrosion rate is at different temperatures measured.Record the relation of corrosion rate and temperature as shown in Figure 2, as can be seen from Figure 2, the corrosion rate that Oil/gas Well barite pollutes unblocking agent constantly increases along with the rising of temperature, and therefore, this Oil/gas Well barite pollutes unblocking agent
Oil/gas Well barite prepared by other embodiments pollutes unblocking agent and all has above-mentioned same nature.In sum this Oil/gas Well barite pollute unblocking agent temperature be 90 DEG C, pH value in 12 ~ 14 scope time, barite corrosion amount can reach more than 4g/L, and corrosion best results can play pipe plugging removal effect.In addition, test by experiment, this treatment agent is only 0.16gg/ (m to N80 steel disc erosion rate
2﹒ h), lower than tap water 0.25g/ (m
2﹒ h), almost completely corrosion-free to tubing string, effectively can solve a difficult problem for recessive acid acid etching.
Claims (6)
1. Oil/gas Well barite pollutes a unblocking agent, it is characterized in that, is prepared from by the component of following weight percent:
Wherein, described composite chelate part is that two or three in amino triphosphoric acid, disodium ethylene diamine tetraacetate, aminodiacetic acid, nitrilotriacetic acid mixes composite forming; Described pH adjusting agent is inorganic base compound; Described corrosion synergistic agent is nitrate; Described clay stabilizer is Repone K.
2. Oil/gas Well barite according to claim 1 pollutes unblocking agent, it is characterized in that, described composite chelate part by amino triphosphoric acid, disodium ethylene diamine tetraacetate and nitrilotriacetic acid in mass ratio 3:2:2 mix, or by amino triphosphoric acid and disodium ethylene diamine tetraacetate in mass ratio 3:4 mix, or by amino triphosphoric acid and nitrilotriacetic acid in mass ratio 3:4 mix, or by aminodiacetic acid and nitrilotriacetic acid in mass ratio 1:1 mix.
3. Oil/gas Well barite according to claim 1 pollutes unblocking agent, and it is characterized in that, described pH adjusting agent is sodium hydroxide, sodium carbonate or potassium hydroxide.
4. Oil/gas Well barite according to claim 3 pollutes unblocking agent, it is characterized in that, described pH adjusting agent regulates Oil/gas Well barite to pollute unblocking agent pH to 12 ~ 14.
5. Oil/gas Well barite according to claim 1 pollutes unblocking agent, it is characterized in that, described corrosion synergistic agent KNO
3or NaNO
3.
6. Oil/gas Well barite according to claim 1 pollutes unblocking agent, it is characterized in that, described oxidizing agent sodium hypochlorite, Losantin or dioxide peroxide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510165533.XA CN104789200A (en) | 2015-04-09 | 2015-04-09 | Blockage removal agent for barite pollution of oil-gas well |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510165533.XA CN104789200A (en) | 2015-04-09 | 2015-04-09 | Blockage removal agent for barite pollution of oil-gas well |
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| CN104789200A true CN104789200A (en) | 2015-07-22 |
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| CN201510165533.XA Pending CN104789200A (en) | 2015-04-09 | 2015-04-09 | Blockage removal agent for barite pollution of oil-gas well |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106634914A (en) * | 2016-12-09 | 2017-05-10 | 西南石油大学 | Working fluid system applicable to water-base drilling fluid filter cake removal before well cementing |
| CN107418541A (en) * | 2017-09-04 | 2017-12-01 | 中国石油集团渤海钻探工程有限公司 | It is a kind of to be used to remove descaling and blockage relieving liquid for boring Completion Operations blocking and preparation method thereof |
| CN108219767A (en) * | 2016-12-14 | 2018-06-29 | 中国石油化工股份有限公司 | A kind of offshore oilfield acid stimulation system and preparation method thereof |
| CN111100619A (en) * | 2019-12-30 | 2020-05-05 | 中国石油集团渤海钻探工程有限公司 | Water absorption retaining agent for sand-carrying workover fluid, application and sand-carrying workover fluid |
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| CN101538457A (en) * | 2009-04-30 | 2009-09-23 | 中国石油天然气股份有限公司 | Input well composite blockage relieving agent and preparation method thereof |
| CN103666425A (en) * | 2012-09-26 | 2014-03-26 | 中国石油天然气股份有限公司 | Blocking remover and blocking removal method for corrosion sulfate compound scale |
| CN103820150A (en) * | 2014-03-14 | 2014-05-28 | 西安石油大学 | Barium sulfate and strontium sulfate descaling agent and preparation method thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106634914A (en) * | 2016-12-09 | 2017-05-10 | 西南石油大学 | Working fluid system applicable to water-base drilling fluid filter cake removal before well cementing |
| CN106634914B (en) * | 2016-12-09 | 2017-09-19 | 西南石油大学 | The working solution system removed suitable for water-base drilling fluid filter cake before well cementation |
| CN108219767A (en) * | 2016-12-14 | 2018-06-29 | 中国石油化工股份有限公司 | A kind of offshore oilfield acid stimulation system and preparation method thereof |
| CN108219767B (en) * | 2016-12-14 | 2021-06-15 | 中国石油化工股份有限公司 | Offshore oilfield acidification yield increasing system and preparation method thereof |
| CN107418541A (en) * | 2017-09-04 | 2017-12-01 | 中国石油集团渤海钻探工程有限公司 | It is a kind of to be used to remove descaling and blockage relieving liquid for boring Completion Operations blocking and preparation method thereof |
| CN111100619A (en) * | 2019-12-30 | 2020-05-05 | 中国石油集团渤海钻探工程有限公司 | Water absorption retaining agent for sand-carrying workover fluid, application and sand-carrying workover fluid |
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Application publication date: 20150722 |