CN115725291A - Authigenic acid for high-temperature reservoir transformation and preparation method thereof - Google Patents
Authigenic acid for high-temperature reservoir transformation and preparation method thereof Download PDFInfo
- Publication number
- CN115725291A CN115725291A CN202211445690.2A CN202211445690A CN115725291A CN 115725291 A CN115725291 A CN 115725291A CN 202211445690 A CN202211445690 A CN 202211445690A CN 115725291 A CN115725291 A CN 115725291A
- Authority
- CN
- China
- Prior art keywords
- acid
- temperature
- self
- temperature reservoir
- generated
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The invention discloses a self-generated acid for high-temperature reservoir transformation and a preparation method thereof, wherein the self-generated acid for high-temperature reservoir transformation comprises the following substances in parts by mass: the high-temperature reservoir reforming acid is characterized by comprising 20-50% of acid generating main agent, 0-20% of stabilizer, 0-10% of high-temperature catalyst and the balance of water, wherein the self-generated acid for high-temperature reservoir reforming does not generate acid at the temperature of 60 ℃ and can prevent corrosion to an on-site storage container, the self-generated acid slowly generates acid at the temperature of above 120 ℃, the acid generation time is more than 8 hours, the acid generation speed is gradually accelerated along with the rise of the temperature, and the acid generation speed can reach above 10% within 4 hours at the temperature of 160-180 ℃.
Description
Technical Field
The invention relates to the technical field of petroleum exploitation reservoir transformation, in particular to a self-generated acid for high-temperature reservoir transformation and a preparation method thereof.
Background
In recent years, with the gradual deep shift of the hot spots of petroleum and natural gas, the development and utilization of deep and ultra-deep marine carbonate reservoirs are increasingly emphasized, the marine carbonate reservoirs in China generally have the characteristics of high temperature, low permeability, strong heterogeneity and the like, if the acid liquid is injected by adopting a conventional acid fracturing method, the reaction rate of the acid liquid and the stratum is too high due to the high temperature of the reservoir and the high initial acid concentration of the acid liquid, the acid liquid is mostly consumed in a near-wellbore area and cannot reach the deep part of the stratum, the deep penetration of the acid liquid cannot be realized, the purpose of deep acidification is achieved, and the effect of reservoir transformation is influenced. The autogenous acid generating system is neutral or weakly acidic on the ground, acid is gradually generated under a certain temperature condition after the autogenous acid is injected into the stratum, and then the reaction with the stratum is started, and the acid generating reaction is gradually generated, so that the acid rock reaction speed is slowed down, the acid rock reaction speed is reduced, the acid liquor can reach deeper and farther stratums, the acidification distance of the acid liquor is effectively improved, and the effect of deeply reforming the reservoir is achieved.
The basic principle of the autogenous hydrochloric acid is that formaldehyde or paraformaldehyde and ammonium chloride undergo nucleophilic addition reaction to generate hydrochloric acid, but the problem is that the acid generation reaction also proceeds at normal temperature, the acid generation delay effect is poor, and corrosion of downhole equipment such as a tubular column and the like can be caused in the injection process; the basic principle of the self-generated hydrofluoric acid is similar to that of the self-generated hydrochloric acid, the aldehyde or ketone product and the fluorine halide are subjected to nucleophilic addition reaction or hydrolysis of the fluoroalkane to generate the hydrofluoric acid, the acid generation is also carried out at normal temperature, and the hydrofluoric acid is more suitable for sandstone formations; the basic principle of the self-generated organic acid is that hydrogen ions are generated through the hydrolysis reaction of esters, and in the reaction process of the esters and rocks, the hydrogen ions are continuously consumed, and the hydrolysis reaction is continuously carried out rightwards, so that the acid is not generated continuously. But the acid generating effect is not ideal, and the aim of effectively eroding the stratum cannot be achieved. With the gradual deepening of oil and gas exploitation, in order to obtain a better reservoir transformation effect, an acid generating system aiming at a high-temperature carbonate rock stratum is urgently needed to be developed, and the method has important practical significance for realizing oil and gas yield increase.
Based on the above, the invention designs a self-generated acid for high-temperature reservoir transformation and a preparation method thereof, so as to solve the problems.
Disclosure of Invention
The invention aims to provide a self-generated acid for high-temperature reservoir reconstruction, which solves the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
the authigenic acid for high-temperature reservoir transformation comprises the following substances in parts by weight: 20-50% of acid-producing main agent, 0-20% of stabilizing agent, 0-10% of high-temperature catalyst and the balance of water.
Preferably, the acid-generating main agent is one or more of methyl acetate, ethyl acetate, methyl lactate and ethyl lactate.
Preferably, the stabilizer is one or more of methanol and ethanol.
Preferably, the high-temperature catalyst is one or more of ammonium chloride and aluminum chloride.
Another object of the present invention is to: the preparation method of the authigenic acid for high-temperature reservoir reconstruction is provided, and specifically comprises the following steps: mixing and stirring the main acid generating agent, the stabilizing agent, the high-temperature catalyst and water according to the components, controlling the stirring temperature below 60 ℃ until the mixture is stirred to a clear and transparent homogeneous solution system with water and ester mutually soluble, and obtaining the self-generated acid.
Compared with the prior art, the invention has the beneficial effects that:
the authigenic acid for high-temperature reservoir transformation provided by the invention is almost free of active acid when being injected into a stratum, a corrosion inhibitor and an iron ion stabilizer which are used in conventional acid liquor are not required to be added, front-end underground equipment is not corroded or is slightly corroded, and the damage to the stratum is low. The method comprises the following specific steps:
1. the authigenic acid for high-temperature reservoir transformation does not generate acid at 60 ℃, so that corrosion to an on-site storage container can be prevented;
2. the autogenous acid for high-temperature reservoir transformation slowly generates acid at the temperature of more than 120 ℃, the acid generation time is more than 8 hours, the acid generation speed is gradually accelerated along with the temperature rise, and the acid generation speed can reach more than 10 percent within 4 hours at the temperature of 160-180 ℃;
3. the authigenic acid for high-temperature reservoir transformation is clear and transparent, is non-toxic and harmless to the environment, and is easy to transport and store.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
In the self-acid-generating system, the addition amount of the acid-generating main agent is 40 percent, the addition amount of the stabilizer is 5 percent, the addition amount of the high-temperature catalyst is 5 percent, and the addition amount of water is 50 percent. Mixing them, stirring them uniformly to obtain clear and transparent homogeneous solution system whose water and ester are mutually soluble, i.e. self-generated acid system.
Wherein the main acid-generating agent is 20% of methyl acetate and 80% of ethyl lactate.
The stabilizer is 50% methanol and 50% ethanol.
The high temperature catalyst is 100% ammonium chloride.
The autogenous acid is poured into a high-pressure reaction kettle container containing cuboid calcium carbonate with certain mass, the container is sealed and heated to 160 ℃, the mixture is taken out after 8 hours of reaction, the consumption of the calcium carbonate is used for calculating the concentration of the autogenous acid, and the result is shown in table 1.
Example 2
In the self-generating acid system, the addition amount of the acid generating main agent is 33 percent, the addition amount of the stabilizer is 14 percent, the addition amount of the high-temperature catalyst is 9 percent, and the addition amount of water is 44 percent. Mixing them, stirring them uniformly to obtain clear and transparent homogeneous solution system whose water and ester are mutually soluble, i.e. self-generated acid system.
Wherein the main acid-generating agent is 100% methyl acetate.
The stabilizer is 50% methanol and 50% ethanol.
The high temperature catalyst was 100% ammonium chloride.
The autogenous acid is poured into a high-pressure reaction kettle container containing cuboid calcium carbonate with certain mass, the container is sealed and heated to 160 ℃, the mixture is taken out after 8 hours of reaction, the consumption of the calcium carbonate is used for calculating the concentration of the autogenous acid, and the result is shown in table 1.
Example 3
In the self-acid-generating system, the addition amount of the acid-generating main agent is 38.5 percent, the addition amount of the high-temperature catalyst is 10 percent, and the addition amount of water is 51.5 percent. Mixing them, stirring them uniformly to obtain clear and transparent homogeneous solution system whose water and ester are mutually soluble, i.e. self-produced acid system.
Wherein the main acid-generating agent is 100% ethyl lactate.
The high temperature stable catalyst is 100% ammonium chloride.
The autogenous acid is poured into a high-pressure reaction kettle container containing cuboid calcium carbonate with certain mass, the container is sealed and heated to 160 ℃, the mixture is taken out after 8 hours of reaction, the consumption of the calcium carbonate is used for calculating the concentration of the autogenous acid, and the result is shown in table 1.
Example 4
In the self-acid-generating system, the addition amount of the acid-generating main agent is 43.5 percent, the addition amount of the high-temperature catalyst is 5 percent, and the addition amount of water is 51.5 percent. Mixing them, stirring them uniformly to obtain clear and transparent homogeneous solution system whose water and ester are mutually soluble, i.e. self-generated acid system.
Wherein the acid-generating main agent is 100 percent ethyl lactate.
The high temperature catalyst is 100% ammonium chloride.
The autogenous acid is poured into a high-pressure reaction kettle container containing cuboid calcium carbonate with certain mass, the container is sealed and heated to 160 ℃, the mixture is taken out after 8 hours of reaction, the consumption of the calcium carbonate is used for calculating the concentration of the autogenous acid, and the result is shown in table 1.
Example 5
In the self-acid-generating system, the addition amount of the acid-generating main agent is 40 percent, the addition amount of the stabilizer is 5 percent, the addition amount of the high-temperature catalyst is 5 percent, and the addition amount of water is 50 percent. Mixing them, stirring them uniformly to obtain clear and transparent homogeneous solution system whose water and ester are mutually soluble, i.e. self-generated acid system.
Wherein the main acid-producing agent is 75% of methyl acetate and 25% of methyl lactate.
The stabilizer is 100% methanol.
The high temperature catalyst was 100% ammonium chloride.
The autogenous acid is poured into a high-pressure reaction kettle container containing cuboid calcium carbonate with certain mass, the container is sealed and heated to 160 ℃, the mixture is taken out after 8 hours of reaction, the consumption of the calcium carbonate is used for calculating the concentration of the autogenous acid, and the result is shown in table 1.
The method for calculating the concentration of the generated acid comprises the following steps:
in the formula:
w-acid concentration from the generated acid,%;
m 1 -filter paper mass, g;
m 2 -mass of calcium carbonate and filter paper after reaction, g;
M CaCO3 -the relative molecular mass of calcium carbonate;
M HCl -relative molecular mass of hydrochloric acid;
m-acid liquor mass.
TABLE 1 acid concentrations for the different examples
From the above embodiments and the above table, it can be seen that:
1. the authigenic acid for high-temperature reservoir transformation does not generate acid at 60 ℃, so that corrosion to an on-site storage container can be prevented;
2. the autogenous acid for high-temperature reservoir reconstruction starts to generate acid slowly at the temperature of more than 120 ℃, the acid generation time is more than 8 hours, the acid generation speed is gradually accelerated along with the temperature rise, and the acid generation speed can reach more than 10 percent within 4 hours at the temperature range of 160-180 ℃;
3. the authigenic acid for high-temperature reservoir transformation is clear and transparent, is non-toxic and harmless to the environment, and is easy to transport and store;
therefore, the self-generated acid for high-temperature reservoir transformation provided by the invention is almost free of active acid when being injected into a stratum, a corrosion inhibitor and an iron ion stabilizer which are used in conventional acid liquor are not required to be added, front-end underground equipment is not corroded or is slightly corroded, and the damage to the stratum is low.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (5)
1. A self-generated acid for high-temperature reservoir transformation is characterized in that: the composition comprises the following substances in parts by mass: 20 to 50 percent of acid-producing main agent, 0 to 20 percent of stabilizer, 0 to 10 percent of high-temperature catalyst and the balance of water.
2. The authigenic acid for high temperature reservoir reformation according to claim 1, wherein: the acid-generating main agent is one or more of methyl acetate, ethyl acetate, methyl lactate and ethyl lactate.
3. The authigenic acid for high temperature reservoir reformation according to claim 1, wherein: the stabilizer is one or more of methanol and ethanol.
4. The authigenic acid for high temperature reservoir reformation according to claim 1, wherein: the high-temperature catalyst is one or more of ammonium chloride and aluminum chloride.
5. A method for producing a self-generated acid for high-temperature reservoir reformation, the self-generated acid for high-temperature reservoir reformation according to any one of claims 1 to 4, characterized in that: the method specifically comprises the following steps: mixing and stirring the main acid generating agent, the stabilizing agent, the high-temperature catalyst and water according to the components, controlling the stirring temperature below 60 ℃ until the mixture is stirred to a clear and transparent homogeneous solution system with water and ester mutually soluble, and obtaining the self-generated acid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211445690.2A CN115725291A (en) | 2022-11-18 | 2022-11-18 | Authigenic acid for high-temperature reservoir transformation and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211445690.2A CN115725291A (en) | 2022-11-18 | 2022-11-18 | Authigenic acid for high-temperature reservoir transformation and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115725291A true CN115725291A (en) | 2023-03-03 |
Family
ID=85296506
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211445690.2A Pending CN115725291A (en) | 2022-11-18 | 2022-11-18 | Authigenic acid for high-temperature reservoir transformation and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115725291A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113698923A (en) * | 2020-05-21 | 2021-11-26 | 中国石油化工股份有限公司 | Self-generated acid system and application thereof |
-
2022
- 2022-11-18 CN CN202211445690.2A patent/CN115725291A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113698923A (en) * | 2020-05-21 | 2021-11-26 | 中国石油化工股份有限公司 | Self-generated acid system and application thereof |
Non-Patent Citations (1)
| Title |
|---|
| 张峰超: "海上油田油井酸化自生酸体系研究", 硕士学位论文电子期刊, no. 06, pages 104 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| DK1979433T3 (en) | A process for the acidification in a wellbore | |
| US3828854A (en) | Dissolving siliceous materials with self-acidifying liquid | |
| CN103497754B (en) | A kind of high temperature and high salinity aqueous fracturing fluid | |
| US9951265B2 (en) | System and methods to deliver energy downhole | |
| CN104403658B (en) | A kind of high temperature resistant cross-linked acid liquid system and preparation method thereof | |
| CN103045227B (en) | Multi-component retarded acid for acidizing sandstone reservoir | |
| MXPA05000521A (en) | Process for treatment of underground reservoirs. | |
| CN110452680A (en) | The method for removing blockage of acidification blocking remover and its preparation method and application acidification blocking remover | |
| CN103131402B (en) | High temperature resistance solid free low damage well killing fluid and preparation method thereof | |
| CN108048065A (en) | A kind of oil/gas well corrosion inhibiter and its preparation method and application | |
| CN104946232A (en) | Mixed alcohol-acid liquid system for compact sandstone reservoir | |
| CN108219763A (en) | A kind of acidizing sandstone oil reservoir slow type MH acid system and its construction technology | |
| CN114350343B (en) | Composite biological self-generated acid system for reservoir transformation | |
| CN108559480A (en) | A kind of Reservoir Acidization augmented injection construction chelating agent and its preparation method and application | |
| CN115725291A (en) | Authigenic acid for high-temperature reservoir transformation and preparation method thereof | |
| CN110437815A (en) | Seawater-based fracturing fluid and preparation method thereof | |
| CN113234427A (en) | Oil field acidification plug removal system based on deep co-fusion solvent | |
| CN105801736B (en) | A kind of polyvinyl 3-triazole compounds and preparation method thereof | |
| CN105734579B (en) | Phosphoric acid corrosion inhibiter | |
| CN1528854A (en) | Compound acidifying liquid containing nitric acid and boratofluroic acid and its use method | |
| CN113698923A (en) | Self-generated acid system and application thereof | |
| CN110982503B (en) | Dissolved polymer microsphere composite unblocking acid and preparation method and application thereof | |
| CN108611085B (en) | Acid liquor for acid fracturing of low physical property section of SAGD well | |
| CN110922953A (en) | Temperature response type filter cake removing completion fluid and preparation method thereof | |
| CN105220157B (en) | A kind of protection liquid matches somebody with somebody Preparation Method with protection liquid |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |