CN104059624A - Acid solution system capable of relieving damage of mud to low-permeability reservoir - Google Patents
Acid solution system capable of relieving damage of mud to low-permeability reservoir Download PDFInfo
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- CN104059624A CN104059624A CN201410299748.6A CN201410299748A CN104059624A CN 104059624 A CN104059624 A CN 104059624A CN 201410299748 A CN201410299748 A CN 201410299748A CN 104059624 A CN104059624 A CN 104059624A
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- acid
- mud
- permeability reservoir
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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
Abstract
The invention discloses an acid solution system capable of relieving damage of mud to a low-permeability reservoir, which is composed of the following components in percentage by weight: 5-10% of methyl sulfonic acid derivative, 2-5% of isoascorbic acid, 0.5-1% of nonionic surfactant, 0.1-0.5% of corrosion inhibitor, 3-5% of hydrofluoric acid, 3-10% of low-polymer alcohol and the balance of water. The methyl sulfonic acid derivative is aminomethane sulfonate, ethyl methanesulfonate, methyl methanesulfonate, methanesulfonic acid or mixture thereof; the nonionic surfactant is fatty alcohol polyethenoxy ether; the corrosion inhibitor is imidazoline quaternary ammonium salt; and the low-polymer alcohol is methanol, ethanol, isopropanol or mixture thereof. The system can effectively relieve damage of clay minerals in drilling mud to the reservoir, and can restore the permeability of the reservoir, so that oil gas can flow into the shaft from the stratum; and thus, the system has important practical meanings.
Description
Technical field
The present invention relates to a kind of acid fluid system of mud to low permeability reservoir injury of removing in oil-gas field development field volume increase process.
Background technology
In drilling fluid, need to add a large amount of clays to make drilling fluid become mud state, thus can be in drilling process, balance rock of borehole wall pressure, forms filter cake at the borehole wall, and sealing and stabilizing borehole, prevent pollution and slump in to hydrocarbon zone.Desirable construction process is that the clay in drilling fluid is just adsorbed on borehole wall surface, and along with the carrying out of follow-up exploitation, the clay particle that is adsorbed on borehole wall surface departs from the borehole wall completely, and gas channel is out exposed, and Oil/gas Well can be produced smoothly.But in drilling process, for the safety of drilling well, often wellbore pressure can be greater than reservoir pressure and causes the mud particles in drilling fluid under differential pressure action, to be squeezed in the pore throat on stratum.Loose, the large pore throat reservoir of exploitation in the past, the resident fluid that drilling well finishes after operation can be taken the clay particle that enters pore throat out of stratum relatively easily; But for fine and close, low permeability reservoir, the pressure on stratum is lower, and reservoir pore throat is less, resident fluid is difficult to clay particle to migrate out stratum, must adopt the way of acidifying that the clay particle corrosion in the pore throat of stratum is returned to row.The acid solution of the corrosion clay of Oilfield using is mainly mud acid acid solution at present, and this acid solution is made up of hydrochloric acid and the hydrofluoric acid that is less than 5%.Adopt the reason of mud acid acid solution to be early stage, clay component can only be by hydrofluoric acid corrosion, but the silicate product after hydrofluoric acid corrosion clay is easy to form precipitation in the time that pH is higher, so need to add the pH of hydrochloric acid guarantee system in lower scope, avoid precipitation generation and cause the injury to stratum.From spot effect, adopt mud acid system also not obvious to the ponding of releasing clay, after each mud acid acid solution acidifying, the stable production period of Oil/gas Well is shorter.Mainly that mud acid system cannot be avoided the secondary injury of reservoir.After mud acid reacts with the clay component in drilling mud, the product of generation is silicofluoride, and these silicofluorides, in the time that environment pH is higher, can precipitate with the form of particle; The response capacity of hydrochloric acid is very strong, enters behind stratum and can react with the carbonatite mineral on stratum very soon, is consumed, and causes the pH of system to raise very soon, causes silicofluoride mineral precipitation, the pore throat of obstruction oil gas.So find a kind of suitable acid fluid system energy efficient solution except the drilling mud that enters stratum pore throat, can not cause secondary injury to stratum again, be necessary to exploitation low permeability reservoir simultaneously.
Summary of the invention
The object of the present invention is to provide a kind of acid fluid system of mud to low permeability reservoir injury of removing, can effectively remove the injury to reservoir of clay mineral in drilling mud, the perviousness of recovering reservoir, is beneficial to oil gas and flows to pit shaft from stratum, has important practical significance.
For reaching above technical purpose, the invention provides following technical scheme.
A kind of acid fluid system of mud to low permeability reservoir injury of removing, formed by following compositions in weight percentage: methyl sulfonic acid 5-10%, saccharosonic acid 2-5%, nonionogenic tenside 0.5-1%, inhibiter 0.1-0.5%, hydrofluoric acid HF3-5%, small molecular alcohol 3-10%, all the other are water.
Described methyl sulfonic acid is aminomethane sulfonic acid, methanesulfonic ethyl ester, methanesulfonic methyl esters, methanesulfonic or its mixture.
Described nonionogenic tenside is fatty alcohol-polyoxyethylene ether.
Described inhibiter is imidazoline quaternary ammonium salt.
Described small molecular alcohol is methyl alcohol, ethanol, Virahol or its mixture.
The preparation process of this acid fluid system is as follows: first in reactor, add small molecules alcohol and water, add again saccharosonic acid, inhibiter and methyl sulfonic acid, stir at ambient temperature after 0.5-1h, add nonionogenic tenside, finally add HF, stir.
The injury of drilling fluid to stratum, the clay particle being mainly manifested in mud is attached to the borehole wall, stops up the passage of oil gas, and this shows particularly evident in low permeability reservoir.In some low permeability reservoir drilling process, there is show of oil and gas (SO&G), but can not obtain commercial hydrocarbon flow when pilot production.Acid fluid system of the present invention is injected in well, and the small molecular alcohol surface tension in acid solution is lower, easily gos deep in clay adhesion layer, and the HF in acid solution is along with small molecular alcohol enters clay seam, and dissolve clays, further by the pore bulge of adsorption by clay layer.In this process, methyl sulfonic acid is decomposed to form methyl sulfonic acid under formation temperature, this acid is a kind of strong acid, make the pH of acid fluid system remain on a lower scope, avoid HF to react the silicofluoride forming with clay and precipitate, meanwhile, methyl sulfonate radical can form chelation structure with the metal ion that reacts generation, reduce the chance that these metal ions and silicofluoric acid root react, reduce the secondary injury to stratum.
Compared with prior art, the present invention has following beneficial effect:
Methyl sulfonic acid is lower with respect to the speed of response of hydrochloric acid and carbonate, thereby methylsulphonic acid spending rate in stratum is slower, can make system remain on lower pH; Methylsulphonic acid can with stratum in metal ion form complex compound, avoid these metal ions and silicofluoric acid root to form and precipitate; In acid fluid system, be added with small molecular alcohol, the pore throat that can guide acid solution intrusion to stop up in earlier stage, the later stage reduces acid solution the possibility that water is locked occurs in pore throat, makes can return fast discharge stratum after acid liquid reaction, after avoiding reacted product to be diluted by resident fluid, form precipitation; Methyl sulfonic acid can biological degradation, has good environment protecting; Sulfonic acid speed of response is slow, can also avoid, due to a large amount of corrosion boreholes wall, causing slump in; Regular hydrochloric acid volatility is too strong, can damage vegetation around well site and personnel, and methyl sulfonic acid volatility is poor, can around not damage well site when site operation.
Embodiment
Further illustrate the present invention below by embodiment.
Embodiment 1
First in reactor, add 15kg methyl alcohol and 429.25kg water, add again 15kg saccharosonic acid, 0.5kg imidazoline quaternary ammonium salt and 25kg aminomethane base sulfonic acid, stir at ambient temperature after 30min, add 0.25kg fatty alcohol-polyoxyethylene ether nonionogenic tenside, finally add 15kgHF, stir, obtain the transparent acid solution of garnet.
Embodiment 2
First in reactor, add 25kg ethanol and 392.1kg water, add again 10kg saccharosonic acid, 2.5kg imidazoline quaternary ammonium salt and 50kg methanesulfonic ethyl ester, stir at ambient temperature after 1h, add 0.4kg fatty alcohol-polyoxyethylene ether nonionogenic tenside, finally add 20kgHF, stir, obtain the transparent acid solution of garnet.
Embodiment 3
First in reactor, add 50kg Virahol and 362.0kg water, add again 25kg saccharosonic acid, 2.5kg imidazoline quaternary ammonium salt and 35kg methanesulfonic methyl esters, stir at ambient temperature after 1h, add 0.5kg fatty alcohol-polyoxyethylene ether nonionogenic tenside, finally add 25kgHF, stir, obtain the transparent acid solution of garnet.
Embodiment 4
First in reactor, add 10kg methyl alcohol, 10kg ethanol and 410.2kg water, add again 20kg saccharosonic acid, 1.5kg imidazoline quaternary ammonium salt, 10 aminomethane base sulfonic acid and 20kg methanesulfonic ethyl ester, stir at ambient temperature after 30min, add 0.3kg fatty alcohol-polyoxyethylene ether nonionogenic tenside, finally add 18kgHF, stir, obtain the transparent acid solution of garnet.
Embodiment 5
First in reactor, add 10kg Virahol, 15kg ethanol, 15kg methyl alcohol and 357.5kg water, add again 25kg saccharosonic acid, 2.0kg imidazoline quaternary ammonium salt and 50kg methanesulfonic methyl esters, stir at ambient temperature after 1h, add 0.5kg fatty alcohol-polyoxyethylene ether nonionogenic tenside, finally add 25kgHF, stir, obtain the transparent acid solution of garnet.
After adopting displacement test test by mud damage front and back and employing de-plugging acid solution, core permeability changes, and comparative example removes the effect of mud damage.Experimental result is in table 1.Data presentation in table 1, adopts plugging removal effect of the present invention to be obviously better than traditional mud acid.
Table 1 various embodiments of the present invention are removed mud damage effect comparison
| Embodiment | Rate of permeation md before injury | Rate of permeation md after injury | Rate of permeation md after peracid | De-plugging rate, % |
| Regular mud acid | 92.96 | 69.98 | 76.18 | 26.98 |
| Embodiment 1 | 78.24 | 42.56 | 83.66 | 115.19 |
| Embodiment 2 | 86.73 | 56.42 | 99.17 | 141.04 |
| Embodiment 3 | 105.35 | 46.84 | 108.05 | 104.61 |
| Embodiment 4 | 80.41 | 69.46 | 90.52 | 192.33 |
| Embodiment 5 | 89.16 | 51.79 | 102.34 | 135.27 |
Claims (5)
1. remove the acid fluid system of mud to low permeability reservoir injury, formed by following compositions in weight percentage: methyl sulfonic acid 5-10%, saccharosonic acid 2-5%, nonionogenic tenside 0.5-1%, inhibiter 0.1-0.5%, hydrofluoric acid 3-5%, small molecular alcohol 3-10%, all the other are water.
2. the acid fluid system of releasing mud as claimed in claim 1 to low permeability reservoir injury, is characterized in that, described methyl sulfonic acid is aminomethane sulfonic acid, methanesulfonic ethyl ester, methanesulfonic methyl esters, methanesulfonic or its mixture.
3. the acid fluid system of releasing mud as claimed in claim 1 to low permeability reservoir injury, is characterized in that, described nonionogenic tenside is fatty alcohol-polyoxyethylene ether.
4. the acid fluid system of releasing mud as claimed in claim 1 to low permeability reservoir injury, is characterized in that, described inhibiter is imidazoline quaternary ammonium salt.
5. the acid fluid system of releasing mud as claimed in claim 1 to low permeability reservoir injury, is characterized in that, described small molecular alcohol is methyl alcohol, ethanol, Virahol or its mixture.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410299748.6A CN104059624A (en) | 2014-06-26 | 2014-06-26 | Acid solution system capable of relieving damage of mud to low-permeability reservoir |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410299748.6A CN104059624A (en) | 2014-06-26 | 2014-06-26 | Acid solution system capable of relieving damage of mud to low-permeability reservoir |
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| CN104059624A true CN104059624A (en) | 2014-09-24 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105950129A (en) * | 2016-05-11 | 2016-09-21 | 中国石油天然气股份有限公司 | Methanesulfonic acid-ammonium hydrogen fluoride acid liquid system and preparation method and application thereof |
| CN109854215A (en) * | 2019-01-28 | 2019-06-07 | 西南石油大学 | A method of acidification water injection well sophisticated category |
| CN112430458A (en) * | 2020-12-03 | 2021-03-02 | 成都欣明化工有限公司 | Water-releasing and locking agent for gas well reservoir |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080139412A1 (en) * | 2006-12-06 | 2008-06-12 | Fuller Michael J | Method for Treating a Subterranean Formation |
| CN102174315A (en) * | 2011-03-10 | 2011-09-07 | 中国石油天然气股份有限公司 | Scale removing and inhibiting agent for later-stage oil well with tertiary oil recovery |
| CN101362942B (en) * | 2008-09-26 | 2011-09-28 | 大庆石油管理局 | Formation opener agent for low permeable reservoir of oilfield |
| CN101747881B (en) * | 2010-01-14 | 2012-11-28 | 胜利油田胜海节能设备有限公司 | Descaling and blockage relieving agent for oil-water well |
| CA2853744A1 (en) * | 2011-10-31 | 2013-05-10 | Cleansorb Limited | Process for treating an underground formation |
-
2014
- 2014-06-26 CN CN201410299748.6A patent/CN104059624A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080139412A1 (en) * | 2006-12-06 | 2008-06-12 | Fuller Michael J | Method for Treating a Subterranean Formation |
| CN101362942B (en) * | 2008-09-26 | 2011-09-28 | 大庆石油管理局 | Formation opener agent for low permeable reservoir of oilfield |
| CN101747881B (en) * | 2010-01-14 | 2012-11-28 | 胜利油田胜海节能设备有限公司 | Descaling and blockage relieving agent for oil-water well |
| CN102174315A (en) * | 2011-03-10 | 2011-09-07 | 中国石油天然气股份有限公司 | Scale removing and inhibiting agent for later-stage oil well with tertiary oil recovery |
| CA2853744A1 (en) * | 2011-10-31 | 2013-05-10 | Cleansorb Limited | Process for treating an underground formation |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105950129A (en) * | 2016-05-11 | 2016-09-21 | 中国石油天然气股份有限公司 | Methanesulfonic acid-ammonium hydrogen fluoride acid liquid system and preparation method and application thereof |
| CN109854215A (en) * | 2019-01-28 | 2019-06-07 | 西南石油大学 | A method of acidification water injection well sophisticated category |
| CN112430458A (en) * | 2020-12-03 | 2021-03-02 | 成都欣明化工有限公司 | Water-releasing and locking agent for gas well reservoir |
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