CN111040749A - Acidizing temporary plugging diverting agent and preparation method thereof - Google Patents
Acidizing temporary plugging diverting agent and preparation method thereof Download PDFInfo
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- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
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Abstract
The invention discloses an acidification temporary plugging diverting agent and a preparation method thereof, wherein the acidification temporary plugging diverting agent comprises the following components in parts by weight: 40-55 parts of alkyl amido propyl dimethylamine, 45-60 parts of cosolvent, 3-10 parts of viscosity interval regulator and 3-5 parts of temperature-resistant additive; the preparation method comprises the following steps: and (2) uniformly mixing the alkyl amido propyl dimethylamine and the cosolvent, adding the viscosity interval regulator and the temperature-resistant additive, and uniformly mixing to obtain the acidification temporary plugging steering agent. Compared with the conventional steering acid, the steering acid has the advantages of large viscosity range, long action time and prolonged steering effect; meanwhile, the diverting agent is green and environment-friendly, does not damage underground reservoirs, can automatically break the gel after the acid liquor reaction is finished, and is favorable for flowback.
Description
Technical Field
The invention relates to an acidification temporary plugging diverting agent and a preparation method thereof.
Background
Acidification is an effective technical measure for increasing the yield of oil and gas wells and increasing the injection of injection wells. Specifically, one or more acidic mixed solutions are injected into the formation through the wellbore, and chemical reaction of acid and part of minerals in the formation is utilized to erode the interconnected pores in the reservoir or the rock on the wall surface of the natural (hydraulic) fracture. For heterogeneous oil and gas reservoirs, conventional acidizing fluids usually direct along a large channel or a high-permeability part of a heterogeneous reservoir, and the low-permeability reservoir is difficult to be effectively acidized, so that the effect of the whole acidizing operation is often influenced. In order to achieve effective acidizing of low permeability reservoirs in heterogeneous low permeability reservoirs, a diversion acidizing operation is required. The current common acidification diversion technology is viscoelastic surfactant diversion technology, which is to add an acidification diversion agent, namely viscoelastic surfactant, into the conventional acidification liquid.
The acid solution to which the diverting agent is added is called diverting acid. During the acidification process, the acid is diverted to the mineral substances (mainly CaCO) in the stratum3) Continuous reaction, shift to pH increase of acid, Ca2+Increased concentration at H+And Ca2+Under the combined action of the two components, the viscoelastic surfactant in the diverting acid is gradually converted into a wormlike micelle from a spherical micelle, the viscosity of the diverting acid is gradually increased, and when the two functions are balanced, the viscosity of the diverting acid reaches the maximum, so that the function of temporarily blocking the diverting is realized. So that the diversion acid injected later can enter a low-permeability reservoir, thereby achieving the diversion purpose.
However, there are two types of acidification diverters currently in use: the type of the acid is carboxyl betaine type, the viscosity of the acid begins to gradually increase when the concentration of the acid is very low, namely the pH value is higher, the temporary blocking steering interval is very short, the viscosity is basically unchanged after increasing to the maximum value, and the viscosity of residual acid is very high. Therefore, the steering effect in the acidification process is not ideal, and the residual acid is difficult to flow back. The other type is a polymer type, and the diverting agent has good temperature resistance, but is not easy to decompose, has damage to stratum and is difficult to flowback.
Disclosure of Invention
In order to solve at least one of the problems in the prior art, the invention provides an acidification temporary plugging diverting agent and a preparation method thereof. Meanwhile, the diverting agent is green and environment-friendly, does not damage underground reservoirs, can automatically break the gel after the acid liquor reaction is finished, and is beneficial to flowback.
The technical scheme adopted by the invention is as follows:
an acidification temporary plugging diverting agent comprises the following components in parts by weight: 40-55 parts of alkyl amido propyl dimethylamine, 45-60 parts of cosolvent, 3-10 parts of viscosity interval regulator and 3-5 parts of temperature-resistant additive.
Further, the acidification temporary blocking diverting agent comprises the following components in parts by weight: 45-50 parts of alkyl amido propyl dimethylamine, 48-55 parts of cosolvent, 4-8 parts of viscosity interval regulator and 3.5-4.5 parts of temperature-resistant additive.
Further, the cosolvent is organic alcohol with the C atom number less than 4.
Further, the cosolvent is one or more of methanol, ethanol, isopropanol or ethylene glycol.
Further, the viscosity interval regulator is polyalkyl fatty amide dimethyl halogenated amine.
Further, the temperature-resistant additive is polymerized fatty alkyl propyl dimethyl alkylamine.
Further, the alkyl amidopropyl dimethylamine is one or more of erucic amidopropyl dimethylamine, oleic amidopropyl dimethylamine, erucic amidopropyl dimethylamine derivatives or oleic amidopropyl dimethylamine derivatives.
A preparation method of an acidification temporary plugging diverting agent comprises the following steps: and (2) uniformly mixing the alkyl amido propyl dimethylamine and the cosolvent, adding the viscosity interval regulator and the temperature-resistant additive, and uniformly mixing to obtain the acidification temporary plugging steering agent.
Compared with the prior art, the invention has the following beneficial effects:
(1) the acidized temporary plugging diverter increases the viscosity interval of diverting acid, namely, a stable transition area is formed after the viscosity value is increased to the range capable of temporarily plugging and diverting along with the change of the acid concentration, then the viscosity value is increased to the peak value and then falls back to the transition area, and finally the viscosity value is reduced until the process of breaking gel, so that the action time of temporarily plugging and diverting is prolonged by the increase of the viscosity interval, the acidized diverting is more favorable for acidized diverting, and the recovery ratio is greatly improved.
(2) The viscosity interval of the acidification temporary blocking steering agent can be adjusted by an interval adjusting agent. In the actual use process, a proper viscosity interval can be selected according to the formation conditions of the oil-gas well, so that the effect of acidizing temporary plugging steering is effectively enhanced.
(3) The residual acid has low viscosity and can be discharged back without adding a gel breaker.
(4) The diverting acid belongs to a green environment-friendly product, and can be degraded without damage to the stratum.
Detailed Description
The present invention is further illustrated below with reference to specific examples.
The alkyl amido propyl dimethylamine can be prepared by condensation reaction of multi-carbon chain unsaturated fatty acid and 3-dimethylamino propylamine (DMAPA) at 160-180 ℃.
Polyalkyl fatty amidodimethyl amine halides can be prepared from fatty amidopropyl dimethyl amine and halogenated alkanes.
Polymerized fatty alkyl propyl dimethyl alkyl amine can be prepared from fatty acyl propyl dimethyl amine and epoxy under the condition of base catalysis.
An acidification temporary plugging diverting agent comprises the following components in parts by weight: 40-55 parts of alkyl amido propyl dimethylamine, 45-60 parts of cosolvent, 3-10 parts of viscosity interval regulator and 3-5 parts of temperature-resistant additive.
Further, the acidification temporary blocking diverting agent comprises the following components in parts by weight: 45-50 parts of alkyl amido propyl dimethylamine, 48-55 parts of cosolvent, 4-8 parts of viscosity interval regulator and 3.5-4.5 parts of temperature-resistant additive.
Further, the cosolvent is organic alcohol with the C atom number less than 4.
Further, the cosolvent is one or more of methanol, ethanol, isopropanol or ethylene glycol.
Further, the viscosity interval regulator is polyalkyl fatty amide dimethyl halogenated amine.
Further, the temperature-resistant additive is polymerized fatty alkyl propyl dimethyl alkylamine.
Further, the alkyl amidopropyl dimethylamine is one or more of erucic amidopropyl dimethylamine, oleic amidopropyl dimethylamine, erucic amidopropyl dimethylamine derivatives or oleic amidopropyl dimethylamine derivatives.
A preparation method of an acidification temporary plugging diverting agent comprises the following steps: and (2) uniformly mixing the alkyl amido propyl dimethylamine and the cosolvent, adding the viscosity interval regulator and the temperature-resistant additive, and uniformly mixing to obtain the acidification temporary plugging steering agent.
Example 1
An acidification temporary plugging diverting agent comprises the following components in parts by weight: 40 parts of alkyl amido propyl dimethylamine, 45 parts of cosolvent, 3 parts of viscosity interval regulator and 3 parts of temperature-resistant additive. The cosolvent is organic alcohol with C atom number less than 4.
A preparation method of an acidification temporary plugging diverting agent comprises the following steps: and (2) uniformly mixing the alkyl amido propyl dimethylamine and the cosolvent, adding the viscosity interval regulator and the temperature-resistant additive, and uniformly mixing to obtain the acidification temporary plugging steering agent.
Example 2
An acidification temporary plugging diverting agent comprises the following components in parts by weight: 55 parts of erucamidopropyl dimethylamine, 60 parts of cosolvent, 10 parts of viscosity interval regulator and 5 parts of temperature-resistant additive. The cosolvent is organic alcohol with C atom number less than 4; the viscosity interval regulator is polyalkyl fatty amide dimethyl ammonium halide; the temperature-resistant additive is polymerized fatty alkyl propyl dimethyl alkylamine.
A preparation method of an acidification temporary plugging diverting agent comprises the following steps: and (2) uniformly mixing the alkyl amido propyl dimethylamine and the cosolvent, adding the viscosity interval regulator and the temperature-resistant additive, and uniformly mixing to obtain the acidification temporary plugging steering agent.
Example 3
An acidification temporary plugging diverting agent comprises the following components in parts by weight: 45 parts of oleic acid amide propyl dimethylamine, 48 parts of cosolvent, 4 parts of viscosity interval regulator and 3 parts of temperature-resistant additive. The cosolvent is methanol; the viscosity interval regulator is polyalkyl fatty amide dimethyl ammonium halide; the temperature-resistant additive is polymerized fatty alkyl propyl dimethyl alkylamine.
A preparation method of an acidification temporary plugging diverting agent comprises the following steps: and (2) uniformly mixing the alkyl amido propyl dimethylamine and the cosolvent, adding the viscosity interval regulator and the temperature-resistant additive, and uniformly mixing to obtain the acidification temporary plugging steering agent.
Example 4
An acidification temporary plugging diverting agent comprises the following components in parts by weight: 47 parts of erucamidopropyl dimethylamine derivative, 48 parts of cosolvent, 4 parts of viscosity interval regulator and 3.5 parts of temperature-resistant additive. The cosolvent is ethanol; the viscosity interval regulator is polyalkyl fatty amide dimethyl ammonium halide; the temperature-resistant additive is polymerized fatty alkyl propyl dimethyl alkylamine.
A preparation method of an acidification temporary plugging diverting agent comprises the following steps: and (2) uniformly mixing the alkyl amido propyl dimethylamine and the cosolvent, adding the viscosity interval regulator and the temperature-resistant additive, and uniformly mixing to obtain the acidification temporary plugging steering agent.
Example 5
An acidification temporary plugging diverting agent comprises the following components in parts by weight: 50 parts of oleic acid amide propyl dimethylamine derivative, 55 parts of cosolvent, 8 parts of viscosity interval regulator and 4.5 parts of temperature-resistant additive. The cosolvent is isopropanol. The viscosity interval regulator is polyalkyl fatty amide dimethyl ammonium halide; the temperature-resistant additive is polymerized fatty alkyl propyl dimethyl alkylamine.
A preparation method of an acidification temporary plugging diverting agent comprises the following steps: and (2) uniformly mixing the alkyl amido propyl dimethylamine and the cosolvent, adding the viscosity interval regulator and the temperature-resistant additive, and uniformly mixing to obtain the acidification temporary plugging steering agent.
Example 6
An acidification temporary plugging diverting agent comprises the following components in parts by weight: 45 parts of alkyl amido propyl dimethylamine, 48 parts of cosolvent, 4 parts of viscosity interval regulator and 3.5 parts of temperature-resistant additive; the cosolvent is ethylene glycol; the viscosity interval regulator is polyalkyl fatty amide dimethyl ammonium halide; the temperature-resistant additive is polymerized fatty alkyl propyl dimethyl alkylamine.
A preparation method of an acidification temporary plugging diverting agent comprises the following steps: and (2) uniformly mixing the alkyl amido propyl dimethylamine and the cosolvent, adding the viscosity interval regulator and the temperature-resistant additive, and uniformly mixing to obtain the acidification temporary plugging steering agent.
Comparative example
The determination method comprises the following steps: adjusting to 200r/min by using a six-speed rotational viscometer, respectively measuring the viscosity of acid solutions containing 20%, 18.5%, 17%, 15.5%, 14%, 12.5%, 10.5%, 9%, 7.5%, 6%, 4.5%, 3% and 1.5% of diverting acid by mass fraction at normal temperature and 25 ℃ and having the pH value of 7, wherein the acidifying temporary plugging diverting agent of any one of examples 1-6 added in each acid solution accounts for 6% of the total weight of each acid solution, and recording the measurement result. After the maximum viscosity was obtained, the solution was heated in a water bath at 90 ℃ for 15min, the viscosity of the solution was measured, and the results were recorded. The results are shown in tables 1-2 below. Diverting acids, typically hydrochloric acid, earth acid; the diverting acid in the process is hydrochloric acid.
TABLE 1
Table 1 shows the results at 25 ℃ at room temperature.
TABLE 2
The peak viscosity is the viscosity at 90 ℃.
In the same manner, the acidification temporary blocking diverter in the above measurement method was replaced with the existing amphoteric betaine type diverter and the data are shown in tables 3 to 4 below.
TABLE 3
Table 3 shows the results at 25 ℃ at room temperature.
TABLE 4
The peak viscosity is the viscosity at 90 ℃.
As shown in tables 1-4, compared with the prior acidification temporary plugging diverter, the acidification temporary plugging diverter of the invention has better viscosity at normal temperature and 90 ℃ than other prior acidification temporary plugging diverters, obviously expands the interval range, prolongs the diversion action time, and improves the maximum viscosity and the temperature resistance, thereby improving the diversion efficiency.
The present invention is not limited to the above-described alternative embodiments, and various other forms of products can be obtained by anyone in light of the present invention. The above detailed description should not be taken as limiting the scope of the invention, which is defined in the claims, and which the description is intended to be interpreted accordingly.
Claims (8)
1. An acidification temporary blocking diverter, which is characterized in that: the composition comprises the following components in parts by weight: 40-55 parts of alkyl amido propyl dimethylamine, 45-60 parts of cosolvent, 3-10 parts of viscosity interval regulator and 3-5 parts of temperature-resistant additive.
2. The acidizing temporary plugging diversion agent according to claim 1, wherein: the composition comprises the following components in parts by weight: 45-50 parts of alkyl amido propyl dimethylamine, 48-55 parts of cosolvent, 4-8 parts of viscosity interval regulator and 3.5-4.5 parts of temperature-resistant additive.
3. An acid transient blocking diverter according to claim 1 or 2, wherein: the cosolvent is organic alcohol with the C atom number less than 4.
4. An acid transient blocking diverter according to claim 1 or 2, wherein: the cosolvent is one or more of methanol, ethanol, isopropanol or ethylene glycol.
5. An acid transient blocking diverter according to claim 1 or 2, wherein: the viscosity interval regulator is polyalkyl fatty amide dimethyl ammonium halide.
6. An acid transient blocking diverter according to claim 1 or 2, wherein: the temperature-resistant additive is polymerized fatty alkyl propyl dimethyl alkylamine.
7. An acid transient blocking diverter according to claim 1 or 2, wherein: the alkyl amido propyl dimethylamine is one or more of erucic amide propyl dimethylamine, oleic acid amido propyl dimethylamine, erucic amide propyl dimethylamine derivatives or oleic acid amido propyl dimethylamine derivatives.
8. A method of preparing an acidizing temporary plugging diversion agent according to any one of claims 1 to 7, which is characterized by comprising the following steps: the method comprises the following steps: and (2) uniformly mixing the alkyl amido propyl dimethylamine and the cosolvent, adding the viscosity interval regulator and the temperature-resistant additive, and uniformly mixing to obtain the acidification temporary plugging steering agent.
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| CN201911339700.2A CN111040749A (en) | 2019-12-23 | 2019-12-23 | Acidizing temporary plugging diverting agent and preparation method thereof |
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| CN201911339700.2A CN111040749A (en) | 2019-12-23 | 2019-12-23 | Acidizing temporary plugging diverting agent and preparation method thereof |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101528889A (en) * | 2006-08-17 | 2009-09-09 | 普拉德研究及开发股份有限公司 | Friction reduction fluids |
| CN102504799A (en) * | 2011-11-29 | 2012-06-20 | 西南石油大学 | Acidification diverter composition |
| CN102851017A (en) * | 2012-08-16 | 2013-01-02 | 四川西普化工股份有限公司 | Viscous-elastic clean fracturing fluid containing erucic acid betaines |
| CN107109199A (en) * | 2014-11-24 | 2017-08-29 | 阿克苏诺贝尔化学品国际有限公司 | Delayed fracture agent for viscoelastic-surfactants based-fluids |
-
2019
- 2019-12-23 CN CN201911339700.2A patent/CN111040749A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101528889A (en) * | 2006-08-17 | 2009-09-09 | 普拉德研究及开发股份有限公司 | Friction reduction fluids |
| CN102504799A (en) * | 2011-11-29 | 2012-06-20 | 西南石油大学 | Acidification diverter composition |
| CN102851017A (en) * | 2012-08-16 | 2013-01-02 | 四川西普化工股份有限公司 | Viscous-elastic clean fracturing fluid containing erucic acid betaines |
| CN107109199A (en) * | 2014-11-24 | 2017-08-29 | 阿克苏诺贝尔化学品国际有限公司 | Delayed fracture agent for viscoelastic-surfactants based-fluids |
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Application publication date: 20200421 |