CN114316936B - Bifunctional depolymerization scale dissolver for oil extraction, and preparation and application thereof - Google Patents
Bifunctional depolymerization scale dissolver for oil extraction, and preparation and application thereof Download PDFInfo
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- Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
Abstract
The invention relates to the field of oilfield chemistry, and discloses a bifunctional depolymerization scale dissolver for oil extraction, and preparation and application thereof. The de-polymerization scale dissolver consists of unsaturated higher fatty acid dimer acid, surfactant and oil solvent, wherein the unsaturated higher fatty acid dimer acid is dimer acid of decaenoic acid, dodecenoic acid, palmitoleic acid, oleic acid, linoleic acid, linolenic acid, eicosenoic acid and eicosadienoic acid; the surfactant adopts OP type, Tween type and peregal type. The dual-function de-polymerization scale dissolver for oil extraction can reduce the viscosity of common crude oil and thick oil through de-polymerization, can dissolve oil scale formed by coagulation of the crude oil through de-polymerization, effectively solves the problems of dredging stratum blockage and bonding a shaft with an oil pumping pipe, has low use cost and good safety, is suitable for large-scale oil field crude oil and thick oil extraction, and has obvious effects on old oil field reservoir reconstruction and oil scale underground in-situ dissolution.
Description
Technical Field
The invention relates to the field of oilfield chemistry, in particular to a bifunctional depolymerization scale dissolver for oil extraction, and preparation and application thereof, and is particularly closely related to crude oil extraction.
Background
At present, the proportion of the thickened oil in the crude oil exploitation is higher and higher, and the improvement of the utilization efficiency of the thickened oil resource becomes more and more important. Not only the newly discovered oil field needs to improve the crude oil extraction rate, but also the old oil field needs to dig the resource potential, and the residual crude oil in the oil well is extracted by various means to exert the maximum benefit of the resource.
However, it is known that thick oil has high density, high viscosity, high metal content, unstable properties, and is prone to coagulation, which makes it difficult to recover. After years of exploitation, the oil well in the old oil field has oil dirt formed in the underground reservoir because of coagulation of crude oil, and the extraction rate of the residual crude oil is low. Years of research prove that the oil dirt and the thick oil contain more colloid and asphaltene. Asphaltene is a complex supermolecular aggregate mainly with a fused aromatic ring structure and widely exists in crude oil, especially thick oil and super thick oil. Petroleum asphaltenes are the heaviest, most polar and most complex components of crude oil systems, and these characteristics make it difficult for asphaltenes to exist in the form of single molecules in crude oil, usually supramolecular aggregates in colloidal systems. In the process of oil exploitation, the viscosity of crude oil is increased by the asphaltene, the asphaltene can be accumulated and settled in the stratum to form oil dirt with different particle sizes, the porosity and the permeability of reservoir rock are reduced, and the exploitation efficiency of the crude oil is influenced.
The viscosity reduction exploitation of crude oil becomes an emerging oil extraction technology in recent years, and particularly, the use of a viscosity reducer improves the recovery ratio to a certain extent. The water-soluble viscosity reducer is mainly used for emulsifying crude oil by adopting an emulsification principle, so that the viscosity is reduced, and the migration of the crude oil in a stratum is facilitated. The main problems of the use of the water-soluble viscosity reducer are that the oil-water emulsification separation is difficult after the oil is extracted and the treatment cost of the reinjection water is higher. The oil-soluble viscosity reducer achieves the effect of reducing the viscosity of the thickened oil mainly through the dilution effect, or disperses and reduces the viscosity of the thickened oil macromolecules through the isolation effect of polymeric macromolecular chains of the viscosity reducer, and some oil-soluble viscosity reducers depolymerize asphaltene aggregates through the action of active groups of the viscosity reducer components and the asphaltene molecules to achieve the viscosity reduction effect.
However, the currently used viscosity reducer for oil extraction has a single function, only plays a role in reducing the viscosity of crude oil to a certain extent, cannot solve the problem of formation blockage caused by oil scale formed by long-term coagulation of asphaltene in a formation, cannot play a role in dredging the formation by dissolving the oil scale, and cannot solve the problem of shaft bonding of an oil pumping pipe caused by coagulation of the asphaltene.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a bifunctional depolymerization scale dissolver for oil extraction and preparation and application thereof, and the technical scheme is as follows:
a dual-function depolymerization scale dissolver for oil extraction comprises the following components in percentage by weight: 3 to 30 percent of unsaturated higher fatty acid dimer acid, 0.1 to 1 percent of surfactant and 69 to 96.9 percent of oil solvent.
The above technical solution can be further optimized as follows:
a dual-function depolymerization scale dissolver for oil extraction comprises the following components in percentage by weight: 5 to 15 percent of unsaturated higher fatty acid dimer acid, 0.5 to 0.6 percent of surfactant and 84.5 to 94.5 percent of oil solvent.
The unsaturated higher fatty acid dimer acid comprises at least one of dodecenoic acid dimer acid, palmitoleic acid dimer acid, oleic acid dimer acid, linoleic acid dimer acid, linolenic acid dimer acid, eicosenoic acid dimer acid and eicosadienoic acid dimer acid.
The surfactant comprises at least one of OP-4, OP-10, Tween-80, Tween-85 and peregal O-10.
The oil solvent comprises at least one of mixed aromatic hydrocarbon, No. 200 solvent oil, diesel oil and light fuel oil.
The flash point of the oil solvent is higher than 40 ℃.
A preparation method of a bifunctional depolymerization scale dissolver for oil production comprises the steps of firstly, sequentially adding unsaturated higher fatty acid dimer acid, surfactant and oil solvent into a container; then mixing and stirring are carried out, and the bifunctional depolymerization scale dissolver for oil extraction is obtained after uniform stirring.
The bifunctional depolymerization scale dissolver for oil extraction is applied to the oil extraction of oil field crude oil.
The use amount of the bifunctional depolymerization scale dissolver for oil extraction is 1 to 10 percent of the weight of the crude oil.
Compared with the prior art, the invention mainly has the following beneficial technical effects:
1. the dual-function depolymerization scale dissolver for oil extraction not only can efficiently depolymerize and reduce viscosity of asphaltene supramolecular aggregates in crude oil, but also can dissolve oil dirt formed by crude oil coagulation in situ, and has the functions of reservoir transformation and stratum blockage dredging.
2. The bifunctional depolymerization scale dissolver for oil extraction can effectively solve the problem of shaft bonding of the oil pumping pipe caused by asphaltene coagulation.
3. The bifunctional depolymerization scale dissolver for oil extraction does not contain sulfur, nitrogen and chlorine which have influence on downstream added tools, and is safe to use and operate on site due to higher flash point, thus being suitable for large-scale oil field common crude oil and thickened oil extraction and old oil field reservoir transformation.
4. The bifunctional depolymerization scale dissolver for oil extraction realizes viscosity reduction on common crude oil and thick oil under the condition of low dosage, and has the function of quickly dissolving oil scale in a stratum; and the raw material of the dimer acid is easy to obtain, and the price is relatively low. Therefore, the bifunctional depolymerization scale dissolver for oil extraction has low comprehensive cost and is beneficial to popularization and application.
5. The bifunctional depolymerization scale dissolver for oil extraction has a reasonable viscosity reduction and scale dissolution mechanism. First, unsaturated higher fatty acid dimer acid is a polymeric acid formed from unsaturated higher fatty acid, which is commonly called dimer acid, which is a mixture; because the molecular weight of the unsaturated high-grade fatty acid dimer acid is moderate and the structure is very unique, the molecule not only has more than two long flexible carbon chains, but also has a relatively rigid annular structure, and the unsaturated high-grade fatty acid dimer acid not only has polar and nonpolar groups, but also has two carboxyl groups and a plurality of reactive groups with active properties such as double bonds and the like; the dimer acid has good thermal stability, not only can not coagulate at the low temperature of-20 ℃, but also can keep better fluidity, does not boil at the temperature of 250 ℃, and does not generate gel or flocculent precipitate in the system; the properties, especially the double carboxyl and a plurality of flexible long carbon chains in the dimer acid molecules, greatly increase the action with asphaltene molecules in crude oil, fully depolymerize asphaltene supermolecule aggregates and greatly reduce the viscosity of the thick oil. Secondly, the surfactant adopts OP type, Tween type and peregal type, which can promote the dissolution of unsaturated high-grade fatty acid dimer acid to oil dirt, accelerate the dissolution of oil dirt formed by asphaltene coagulation in an oil storage stratum, achieve the aim of dredging stratum blockage and solve the problem of shaft bonding oil pumping pipe caused by asphaltene coagulation. And thirdly, the flash point of the used oil solvent is required to be higher than 40 ℃, so that the safety of field use and operation is ensured, and the popularization and the application are facilitated.
Detailed Description
Before describing specific embodiments, a method for evaluating the effect of the present invention will be described.
1. Method for measuring viscosity reduction performance of de-polymerized scale dissolver
Placing the thick oil and a certain amount of scale-removing and dissolving agent into a beaker, placing the beaker in a constant-temperature water bath at 50 ℃, keeping the temperature for 1h, placing a stirring paddle in the center of the beaker and away from the bottomAnd (2-3) mm away, regulating the rotation speed to 250r/min, and stirring for 2 min under the condition of constant temperature. Samples were then taken and the viscosity of the samples was determined rapidly within 20 s using a rotational viscometer. The viscosity of the pure thickened oil measured without the addition of a de-polymerization scale dissolver is recordedμ oThe viscosity of the oil sample is measured after adding the de-scaling agentμ lThe viscosity reduction rate is as follows,
f =(μ o-μ l)/μ o×100%
f, viscosity reduction rate; mu.so-viscosity of the thick oil sample at 50 ℃, mPa · s; mu.slViscosity, mPas, of the thick oil after addition of the de-polymerized scale dissolvent sample at 50 ℃.
The larger the viscosity reduction rate is, the better the viscosity reduction effect is.
2. Method for measuring scale dissolving performance of depolymerization scale dissolving agent
Putting a certain amount of oil dirt (crude oil sediment) and a depolymerization and scale dissolution agent which are taken from an oil well site into a beaker, putting the beaker into a constant-temperature water bath at 50 ℃ to dissolve the oil dirt for 30min at a constant temperature, then performing suction filtration by using a Buchner funnel, collecting solid matters on filter paper, and weighing. The scale dissolution rate is as follows,
s= (w o-w l)/w o×100%
s-scale dissolution rate; w is ao-sample weight of oil stain before dissolution, g; w is alWeight of solid remaining after dissolution at 50 ℃ g.
The larger the scale dissolution rate is, the better the dredging effect on the oil scale blockage of the stratum is.
The present invention will be described in detail with reference to specific examples.
Example 1
10 g of dodecenoic acid dimer acid and 10 g of dodecenoic acid dimer acid are added into a container, 1 g of OP-10 is added, 79 g of No. 200 solvent oil is added, and 100 g of the depolymerization scale dissolvent is obtained after mixing and stirring uniformly. The viscosity reduction rate and the scale dissolution rate of the depolymerization scale dissolver are respectively shown in tables 1 and 2.
Example 2
Adding 3 g of palmitoleic acid dimer acid, then adding 0.1 g of tween-80, finally adding 30 g of No. 200 solvent oil and 66.9 g of mixed aromatic hydrocarbon, mixing and stirring, and stirring uniformly to obtain 100 g of depolymerization scale dissolvent. The viscosity reduction rate and the scale dissolution rate of the depolymerization scale dissolver are respectively shown in tables 1 and 2.
Example 3
Adding 30 g of oleic acid dimer acid, then adding 0.5 g of OP-10 and 0.5 g of tween-80, and finally adding 69 g of diesel oil into a container, mixing and stirring, and uniformly stirring to obtain 100 g of depolymerization scale dissolvent. The viscosity reduction rate and the scale dissolution rate of the depolymerization scale dissolver are respectively shown in tables 1 and 2.
Example 4
6 g of oleic acid dimer acid and 6 g of linoleic acid dimer acid are added into a container, then 0.3 g of OP-4 and 0.3 g of Tween-85 are added, and finally 87.4 g of light fuel oil is added, mixed and stirred, and then 100 g of depolymerization scale dissolver is obtained after uniform stirring. The viscosity reduction rate and the scale dissolution rate of the depolymerization scale dissolver are respectively shown in tables 1 and 2.
Example 5
Adding 1 g of eicosenoic acid dimer acid and 3 g of linoleic acid dimer acid into a container, then adding 0.2 g of peregal O-10 and 0.3 g of tween-85, finally adding 95.5 g of mixed aromatic hydrocarbon, mixing and stirring, and stirring uniformly to obtain 100 g of the scale-dissolving agent. The viscosity reduction rate and the scale dissolution rate of the depolymerization scale dissolver are respectively shown in tables 1 and 2.
Example 6
10 g of eicosenoic acid dimer acid and 5 g of eicosenoic acid dimer acid are added into a container, then 0.5 g of tween-85 is added, and finally 84.5 g of diesel oil is added, mixed and stirred, and stirred uniformly to obtain 100 g of depolymerization scale dissolvent. The viscosity reduction rate and the scale dissolution rate of the depolymerization scale dissolver are respectively shown in tables 1 and 2.
Example 7
Adding 8 g of oleic acid dimer acid, then adding 1 g of OP-4, and finally adding 91 g of diesel oil into a container, mixing and stirring, and uniformly stirring to obtain 100 g of depolymerization scale dissolver. The viscosity reduction rate and the scale dissolution rate of the depolymerization scale dissolver are respectively shown in tables 1 and 2.
Example 8
Adding 3 g of linolenic acid dimer acid, 3 g of dodecenoic acid dimer acid and 3 g of palmitoleic acid dimer acid into a container, then adding 0.2 g of OP-10 by weight, finally adding 30.8 g of diesel oil and 60 g of mixed aromatic hydrocarbon, mixing and stirring, and uniformly stirring to obtain 100 g of depolymerization scale dissolving agent. The viscosity reduction rate and the scale dissolution rate of the depolymerization scale dissolver are respectively shown in tables 1 and 2.
Example 9
5 g of eicosadienoic acid dimer acid is added into a container, then 0.5 g of OP-10 and 0.5 g of peregal O-10 are added, and finally 94 g of No. 200 solvent oil is added, mixed and stirred, and then 100 g of depolymerization scale dissolvent is obtained after uniform stirring. The viscosity reduction rate and the scale dissolution rate of the depolymerization scale dissolver are respectively shown in tables 1 and 2.
Example 10
Firstly, adding 10 g of linoleic acid dimer acid, then adding 0.5 g of OP-10 and 0.2 g of tween-80, and finally adding 89.3 g of diesel oil, mixing and stirring, and stirring uniformly to obtain 100 g of depolymerization scale dissolver. The viscosity reduction rate and the scale dissolution rate of the depolymerization scale dissolver are respectively shown in tables 1 and 2.
Example 11
2 g of oleic acid dimer acid and 3 g of palmitoleic acid dimer acid are added into a container, then 0.5 g of OP-10 is added, and finally 31 g of No. 200 solvent naphtha and 63.5 g of diesel oil are added, mixed and stirred, and then 100 g of depolymerization scale dissolvent is obtained after uniform stirring. The viscosity reduction rate and the scale dissolution rate of the depolymerization scale dissolver are respectively shown in tables 1 and 2.
Example 12
5 g of eicosadienoic acid dimer acid is added into a container, then 0.5 g of peregal O-10 is added, and finally 94.5 g of mixed aromatic hydrocarbon is added, mixed and stirred, and stirred uniformly to obtain 100 g of depolymerization scale dissolvent. The viscosity reduction rate and the scale dissolution rate of the depolymerization scale dissolver are respectively shown in tables 1 and 2.
TABLE 1 viscosity reduction Effect of the DeScale-Dedecomposing Agents
| Example number | Oil sample | The addition amount of the de-scaling agent (weight percentage of the thickened oil/%) | Initial viscosity of oil sample (50 ℃ C.)/mPa. multidot.s | The viscosity of the oil sample (50 ℃) is/mPa & s after the de-polymerized scale dissolvent is added | Viscosity reduction ratio/%) |
| Example 1 | Common crude oil | 1 | 455 | 42 | 90.8 |
| Example 1 | Thickened oil | 1 | 4356 | 183 | 95.8 |
| Example 2 | Thickened oil | 4 | 4356 | 122 | 97.2 |
| Example 3 | Thickened oil | 3 | 6782 | 140 | 97.9 |
| Example 4 | Super heavy oil | 7 | 11406 | 201 | 98.2 |
| Example 5 | Super heavy oil | 8 | 44700 | 960 | 97.8 |
| Example 6 | Thickened oil | 2 | 6782 | 156 | 97.7 |
| Example 7 | Super heavy oil | 8 | 67372 | 1756 | 97.4 |
| Example 8 | Super heavy oil | 8 | 67372 | 1060 | 98.4 |
| Example 9 | Super heavy oil | 8 | 90576 | 3718 | 95.9 |
| Example 10 | Super heavy oil | 10 | 92315 | 3657 | 96.0 |
| Example 11 | Super heavy oil | 10 | 89945 | 3067 | 95.3 |
| Example 12 | Thickened oil | 2 | 5368 | 378 | 93.0 |
As shown in Table 1, the viscosity reduction rate of the depolymerization scale dissolver of the invention to common crude oil reaches more than 90%; the viscosity reduction rate of various heavy oils reaches more than 93 percent, and the viscosity reduction rate of the high oil reaches more than 98 percent.
TABLE 2 Scale dissolution Effect of the Depolymeric Scale dissolver
| Example number | Scale sample | Dosage of depolymerization scale dissolver/g | Initial weight of oil dirt/g | Weight of solid remaining after dissolution/g | The% Scale dissolution rate (50 ℃ C.) /) |
| Example 1 | Chen 373-Ping 84 thick oil dirt | 2 | 1 | 0.02 | 98 |
| Example 2 | High 424-oblique 25 thick oil dirt | 2 | 1 | 0.05 | 95 |
| Example 3 | Zheng 373-oblique 11 thick oil dirt | 1 | 1 | 0.35 | 65 |
| Example 4 | Chen 373-Ping 84 thick oil scale | 0.5 | 1 | 0.45 | 55 |
| Example 5 | High 424-oblique 25 thick oil dirt | 0.5 | 0.5 | 0.12 | 88 |
| Example 6 | Zheng 373-oblique 11 thick oil dirt | 0.5 | 1 | 0.38 | 62 |
| Example 7 | Single 83-X136 heavy oil scale | 2 | 1 | 0.10 | 90 |
| Example 8 | 8-16C8 thick oil dirt of lone Dong | 1 | 1 | 0.25 | 75 |
| Example 9 | Chen 373-Ping 84 thick oil scale | 1 | 1 | 0.21 | 79 |
| Example 10 | High 424-oblique 25 thick oil dirt | 2 | 1 | 0.03 | 97 |
| Example 11 | Reclaimed 119-oblique 34 thick oil scale | 2 | 1 | 0.07 | 93 |
| Example 12 | 8-16C8 thick oil dirt of lone Dong | 2 | 1 | 0.20 | 80 |
As shown in Table 1, the minimum scale dissolution rate of the depolymerized scale dissolver is 55%, most of the depolymerized scale dissolver is more than 80%, and the highest scale dissolution rate of the depolymerized scale dissolver is 98%.
The foregoing is only a partial embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (6)
1. The bifunctional depolymerization scale dissolver for oil extraction is characterized by comprising the following components in percentage by weight: 3 to 30 percent of unsaturated higher fatty acid dimer acid, 0.1 to 1 percent of surfactant and 69 to 96.9 percent of oil solvent; the unsaturated higher fatty acid dimer acid is selected from at least one of dodecenoic acid dimer acid, palmitoleic acid dimer acid, oleic acid dimer acid, linoleic acid dimer acid, linolenic acid dimer acid, eicosenoic acid dimer acid and eicosadienoic acid dimer acid; the surfactant is selected from at least one of OP-4, OP-10, Tween-80, Tween-85 and peregal O-10; the oil solvent is at least one selected from mixed aromatic hydrocarbon, No. 200 solvent oil, diesel oil and light fuel oil.
2. The bifunctional depolymerization scale dissolver for oil recovery according to claim 1, characterized by consisting of the following components and weight percentages thereof: 5 to 15 percent of unsaturated higher fatty acid dimer acid, 0.5 to 0.6 percent of surfactant and 84.5 to 94.5 percent of oil solvent.
3. The bifunctional depolymerization scale dissolver for oil recovery as claimed in claim 1, wherein the flash point of the oil solvent is higher than 40 ℃.
4. The method for preparing the bifunctional depolymerization scale dissolver for oil production according to claim 1, wherein the unsaturated higher fatty acid dimer acid, the surfactant and the oil solvent are added into a container in sequence; then mixing and stirring are carried out, and the bifunctional depolymerization scale dissolver for oil extraction is obtained after uniform stirring.
5. The use of the bifunctional depolymerization scale dissolver for oil production according to claim 1, wherein the bifunctional depolymerization scale dissolver for oil production is used in crude oil production in oil field.
6. The use of the bifunctional depolymerization scale dissolver for oil production according to claim 5, wherein the bifunctional depolymerization scale dissolver for oil production is used in an amount of 1-10% by weight of crude oil.
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