CN108531156B

CN108531156B - Thickened oil dispersion oil production auxiliary agent suitable for offshore oil field

Info

Publication number: CN108531156B
Application number: CN201810285480.9A
Authority: CN
Inventors: 姜红; 周洪涛; 刘源; 傅桂云
Original assignee: Dongying Baiyang Petroleum Technology Co ltd
Current assignee: Dongying Baiyang Petroleum Technology Co ltd
Priority date: 2018-04-03
Filing date: 2018-04-03
Publication date: 2020-11-17
Anticipated expiration: 2038-04-03
Also published as: CN108531156A

Abstract

The invention provides a thickened oil dispersion oil extraction auxiliary agent suitable for offshore oil fields, which has the technical scheme that: the auxiliary agent formula comprises the following components in percentage by mass of 100 percent: 18-30% of heavy alkyl benzene sulfonic acid sodium salt, 12-25% of sulfobetaine, 6-12% of fatty alcohol-polyoxyethylene ether, 10-15% of coconut oil fatty acid diethanolamide, 3% of sulfonate imidazoline quaternary ammonium salt, 8% of sorbitol and the balance of deionized water. The invention has the beneficial effects that: the formula is reasonable and practical, and the viscosity reduction effect is obvious; secondly, electric heating is not needed, and energy is saved; and thirdly, the cost is saved, the time and the labor are saved, and the working efficiency and the economic benefit are improved.

Description

Thickened oil dispersion oil production auxiliary agent suitable for offshore oil field

Technical Field

The invention relates to the technical field of oilfield exploitation, in particular to a thickened oil dispersion oil extraction auxiliary agent suitable for offshore oilfields.

Background

The heavy oil (also called heavy oil) has a large proportion in the petroleum reserves, especially in China. The viscous oil has high viscosity, and brings many difficulties for flooding, wellhead extraction and pipeline transportation. Offshore production is more difficult than onshore production. The viscous oil has high viscosity because the viscous oil contains more long-chain hydrocarbons (heavy oil), has higher specific gravity and coagulation temperature than light oil, contains more colloidal substances and asphaltine, is easy to agglomerate and increases flow resistance. When water is used for oil displacement, the mineralization degree is high, and the flowing difficulty is also caused. The normal production can be realized only by adopting viscosity reduction and drag reduction measures.

The current commonly used methods for reducing viscosity and drag comprise: 1. heating method: the produced liquid is extracted and conveyed above the condensation point by adopting electric heating, steam heating and the like, which can consume a large amount of energy. 2. Adding light oil to dilute the mixture: in the process of exploiting thick oil, light oil products (such as diesel oil) with short carbon chains are added, so that the thick oil is thinned, the viscosity is reduced, more light oil needs to be added, the process is complex, facilities such as pipelines and pumps need to be added, and the cost is extremely high. 3. Adding a chemical viscosity reducer: the emulsion type of the produced fluid is changed, the fluidity of the produced fluid is improved, two categories of oil-soluble surfactants and water-soluble surfactants are added, but the emulsion breaking difficulty and workload are increased for the produced fluid by an emulsion method.

Disclosure of Invention

Aiming at the problems, the invention provides a novel oil extraction auxiliary agent which has reasonable and practical formula, energy and electricity conservation and obvious viscosity reduction effect.

The purpose of the invention is realized by the following technical scheme: in the production of thick oil, the oil-water mixture is in the state of water-in-oil emulsion, the particles of the water-in-oil are oil outside, water is inside, and the viscosity of the oil is high, so that the viscosity of well fluid is high, and the flow resistance is large.

The auxiliary agent formula comprises the following components in percentage by mass of 100 percent: 18-30% of heavy alkyl benzene sulfonic acid sodium salt, 12-25% of sulfobetaine, 6-12% of fatty alcohol-polyoxyethylene ether, 10-15% of coconut oil fatty acid diethanolamide, 3% of sulfonate imidazoline quaternary ammonium salt, 8% of sorbitol and the balance of deionized water.

The invention has the beneficial effects that: the formula is reasonable and practical, and the viscosity reduction effect is obvious; secondly, electric heating is not needed, and energy is saved; and thirdly, the cost is saved, the time and the labor are saved, and the working efficiency and the economic benefit are improved.

Detailed Description

Mixing all the components according to the proportion of the formula and stirring uniformly. The medicament has the following properties: the liquid is a light yellow transparent uniform liquid, has no suspended matter, no precipitate, no layering and good fluidity, is easy to dissolve in water, and is a uniform liquid after being mixed with the water; the pH value is 6-9; flash point > 100 ℃; the solidifying point is lower than-25 ℃.

When the using concentration of the medicament is 3 per mill, the viscosity reduction rate is more than 96 percent; oil-water interfacial tension < 9 x 10^-3mN/m; the drag reduction rate is more than 80 percent;

and (3) hanging a cup for testing: preparing 1% medicament aqueous solution, mixing the oil sample and the prepared medicament aqueous solution in a beaker, stirring and pouring out the mixture with no cup hanging phenomenon, wherein the oil-water ratio is 7: 3.

The well-head chemical feeding test is carried out on CB248A-5 and CB4D wells of the offshore oil production plant of the Shengli oil field, the chemical is added according to about 3 per mill of the oil well effluent, the viscosity reduction effect is obvious, and the viscosity reduction rate is more than 98 percent.

The electric heating is saved in the process of thick oil exploitation, and the electricity-saving effect is obvious.

Example 1:

15-25% of heavy alkyl benzene sulfonic acid sodium salt, 11-22% of sulfobetaine, 4-9% of fatty alcohol-polyoxyethylene ether, 7-11% of coconut oil fatty acid diethanolamide, 2% of sulfonate imidazoline quaternary ammonium salt, 5% of sorbitol and the balance of deionized water.

Example 2: 18-30% of heavy alkyl benzene sulfonic acid sodium salt, 12-25% of sulfobetaine, 6-12% of fatty alcohol-polyoxyethylene ether, 10-15% of coconut oil fatty acid diethanolamide, 3% of sulfonate imidazoline quaternary ammonium salt, 8% of sorbitol and the balance of deionized water.

Example 3: 20-32% of heavy alkyl benzene sulfonic acid sodium salt, 15-28% of sulfobetaine, 8-15% of fatty alcohol-polyoxyethylene ether, 13-19% of coconut oil fatty acid diethanolamide, 5% of sulfonate imidazoline quaternary ammonium salt, 10% of sorbitol and the balance of deionized water.

Claims

1. The viscous oil dispersion oil extraction auxiliary agent suitable for offshore oil fields is characterized in that: the auxiliary formula comprises the following components in percentage by mass of 100 percent: 18-30% of heavy alkyl benzene sulfonic acid sodium salt, 12-25% of sulfobetaine, 6-12% of fatty alcohol-polyoxyethylene ether, 10-15% of coconut oil fatty acid diethanolamide, 3% of sulfonate imidazoline quaternary ammonium salt, 8% of sorbitol and the balance of deionized water; the preparation method of the auxiliary agent comprises the following steps: mixing all the components according to the proportion of the formula and stirring uniformly; the performance of the auxiliary agent is as follows: the liquid is a light yellow transparent uniform liquid, has no suspended matter, no precipitate, no layering and good fluidity, is easy to dissolve in water, and is a uniform liquid after being mixed with the water; the pH value is 6-9; flash point > 100 ℃; the solidifying point is lower than-25 ℃.