阅读说明：本技术 一种开发致密油的渗吸排驱剂 (Imbibition displacement agent for developing compact oil ) 是由 明爱华 于 2020-06-05 设计创作，主要内容包括：本发明涉及油田处理技术领域,具体地说,涉及一种开发致密油的渗吸排驱剂,本发明的渗吸排驱剂将岩心处理后,润湿性转变为强亲水,渗吸采收率达到31.3％,大幅度地提高了渗吸采收率,实现致密油渗吸开发,致密储层岩石表面洞湿性必须为水湿,对于致密储层岩石表面为油湿的必须实现岩石表面润湿反转,使油湿表面转变为水湿表面。本发明渗吸驱排剂就是致密储层岩石表面润湿反转剂,使致密储层岩石表面由油湿反转为水湿,即使岩石表面水的倾角由θ≥90°降为θ＜90°,实现致密储层内原油渗吸开发的目的。(The invention relates to the technical field of oil field treatment, in particular to an imbibition displacement agent for developing compact oil, which converts the wettability into strong hydrophilicity after the core is treated, the imbibition recovery ratio reaches 31.3 percent, greatly improves the imbibition recovery ratio, realizes the imbibition development of the compact oil, ensures that the hole humidity of the rock surface of a compact reservoir is water-wet, and realizes the rock surface wetting reversal when the rock surface of the compact reservoir is oil-wet, so that the oil-wet surface is converted into the water-wet surface. The seepage and suction displacement agent is a compact reservoir rock surface wetting reversal agent, so that the oil wetting of the compact reservoir rock surface is reversed to the water wetting, even if the inclination angle of the water on the rock surface is reduced from theta being more than or equal to 90 degrees to theta being less than 90 degrees, and the purpose of crude oil seepage and suction development in the compact reservoir is realized.)

1. The seepage and displacement agent for developing compact oil is characterized in that: the material comprises the following raw materials by weight: 40-45g of bromododecane, 105g of anhydrous ethanol, 35-40g of tetramethylethylenediamine and 40-45g of bromoethyl sodium sulfonate.

2. The osmotic displacement agent for developing compact oil according to claim 1, wherein: the material comprises the following raw materials by weight: 42g of bromododecane, 104g of absolute ethanol, 39g of tetramethylethylenediamine and 45g of sodium bromoethylsulfonate.

3. The osmotic displacement agent for developing compact oil according to claim 1, wherein: the material comprises the following raw materials by weight: 40g of bromododecane, 100g of absolute ethyl alcohol, 35g of tetramethylethylenediamine and 40g of bromoethyl sodium sulfonate.

4. The osmotic displacement agent for developing compact oil according to claim 1, wherein: the material comprises the following raw materials by weight: 45g of bromododecane, 105g of absolute ethanol, 40g of tetramethylethylenediamine and 45g of bromoethyl sodium sulfonate.

5. The osmotic displacement agent for developing compact oil according to any one of claims 1 to 4, wherein: the preparation method comprises the following steps:

s1: weighing the raw materials according to the weight;

s2: cleaning and drying one conical flask, adding the weighed bromododecane into the conical flask, adding 60-65g of absolute ethyl alcohol serving as a reaction solvent into the conical flask, and stirring the mixed solution in the conical flask by using a magnetic stirrer;

s3: adding tetramethylethylenediamine into the conical flask, putting the conical flask into a water bath, heating to 78-80 ℃, and continuously stirring for reflux reaction for 40-48 h;

s4: after the reaction, standing and cooling to room temperature, placing the reaction product in a rotary evaporator to evaporate the absolute ethyl alcohol in the mixed solution to obtain yellow wax;

s5: recrystallizing the yellow wax-like substance obtained in the step S4 once, and drying the yellow wax-like substance or obtaining white powder in a vacuum drying oven to obtain an intermediate product;

s6: cleaning and drying the other conical flask, adding the intermediate product in S5 into the conical flask, stirring the mixed solution in the conical flask by using a magnetic stirrer, dropwise adding sodium bromoethyl sulfonate into the conical flask, dropwise adding a pH regulator at the same time, keeping the pH value at 7-8, and reacting for 2-3h under the water bath condition of 60-65 ℃;

s7: crystallizing the reactant in S6 at low temperature to separate out white precipitate, and vacuum drying the crystallized white precipitate to obtain white solid powder as N, N '-ditetradecylsulfo-N, N' -2-dimethyl-ethylenediamine betaine surfactant as the absorbing and expelling agent.

6. The osmotic displacement agent for developing compact oil according to claim 5, wherein: bromododecaneThe mole ratio of the compound to the tetramethylethylenediamine is n₁：n₂＝2：1。

7. The osmotic displacement agent for developing compact oil according to claim 5, wherein: the molar ratio of the intermediate product to the bromoethyl sodium sulfonate is n₃：n₄＝1：2。

8. The osmotic displacement agent for developing compact oil according to claim 5, wherein: in step S5, recrystallization was performed using ethyl acetate.

9. The osmotic displacement agent for developing compact oil according to claim 5, wherein: the pH regulator is mixed solution of triethylamine and acetone.

10. The osmotic displacement agent for developing compact oil according to claim 5, wherein: the temperature of the low-temperature crystallization in the step S7 is 10-15 ℃.

Technical Field

The invention relates to the technical field of oilfield treatment, in particular to a seepage, suction and displacement agent for developing compact oil.

Background

The petroleum industry divides reservoirs into high permeability reservoirs, medium permeability reservoirs, low permeability reservoirs and tight oil reservoirs according to the permeability of the petroleum reservoir. For the definition of compact oil, the method is generally accepted by a giardia college and institution in China mainly from the storage characteristics and the reservoir characteristics of the compact oil: (1) the occurrence state of the compact oil is similar to that of shale oil gas, mainly in an adsorption state or a free state, and has no obvious trap: (2) the main site of occurrence of the tight oil is the adjacent reservoir of the oil-bearing rock, and the autogenous self-storage or short-distance migration is the main basis for dividing the tight oil into unconventional oil and gas. The main idea of developing compact oil in our country is water flooding after fracturing, which brings about similar problems to shale gas and compact sandstone gas, namely, crude oil in fractures made by fracturing and natural fractures communicated with the fractures is rapidly extracted, and the capacity is rapidly reduced to be below the industrial oil flow. The crude oil in the matrix is not substantially used during waterflood displacement.

Disclosure of Invention

The invention aims to provide a seepage, absorption and displacement agent for developing compact oil, so as to solve the problem that crude oil in a matrix is not used basically when water injection displacement is carried out at present, which is proposed in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme:

an imbibition displacement agent for developing compact oil comprises the following raw materials by weight: 40-45g of bromododecane, 105g of anhydrous ethanol, 35-40g of tetramethylethylenediamine and 40-45g of bromoethyl sodium sulfonate.

Preferably, the feed comprises the following raw materials by weight: 42g of bromododecane, 104g of absolute ethanol, 39g of tetramethylethylenediamine and 45g of sodium bromoethylsulfonate.

Preferably, the feed comprises the following raw materials by weight: 40g of bromododecane, 100g of absolute ethyl alcohol, 35g of tetramethylethylenediamine and 40g of bromoethyl sodium sulfonate.

Preferably, the feed comprises the following raw materials by weight: 45g of bromododecane, 105g of absolute ethanol, 40g of tetramethylethylenediamine and 45g of bromoethyl sodium sulfonate.

The preparation method of the osmotic displacement agent for developing compact oil comprises the following steps:

s1: weighing the raw materials according to the weight;

s2: cleaning and drying one conical flask, adding the weighed bromododecane into the conical flask, adding 60-65g of absolute ethyl alcohol serving as a reaction solvent into the conical flask, and stirring the mixed solution in the conical flask by using a magnetic stirrer;

s3: adding tetramethylethylenediamine into the conical flask, putting the conical flask into a water bath, heating to 78-80 ℃, and continuously stirring for reflux reaction for 40-48 h;

s4: after the reaction, standing and cooling to room temperature, placing the reaction product in a rotary evaporator to evaporate the absolute ethyl alcohol in the mixed solution to obtain yellow wax;

s5: recrystallizing the yellow wax-like substance obtained in the step S4 once, and drying the yellow wax-like substance or obtaining white powder in a vacuum drying oven to obtain an intermediate product;

s6: cleaning and drying the other conical flask, adding the intermediate product in S5 into the conical flask, stirring the mixed solution in the conical flask by using a magnetic stirrer, dropwise adding sodium bromoethyl sulfonate into the conical flask, dropwise adding a pH regulator at the same time, keeping the pH value at 7-8, and reacting for 2-3h under the water bath condition of 60-65 ℃;

s7: crystallizing the reactant in S6 at low temperature to separate out white precipitate, and vacuum drying the crystallized white precipitate to obtain white solid powder as N, N '-ditetradecylsulfo-N, N' -2-dimethyl-ethylenediamine betaine surfactant as the absorbing and expelling agent.

Preferably, the molar ratio of bromododecane to tetramethylethylenediamine is n₁：n₂＝2：1。

Preferably, the molar ratio of the intermediate product to the sodium bromoethylsulfonate is n₃：n₄＝1：2。

Preferably, in step S5, recrystallization is performed using ethyl acetate.

Preferably, the pH regulator is a triethylamine/acetone mixed solution.

Preferably, the temperature for the low temperature crystallization in step S7 is 10-15 ℃.

Compared with the prior art, the invention has the beneficial effects that: the seepage and suction displacement agent for developing the compact oil has the advantages that after the core is treated, the wettability is changed into strong hydrophilicity, the seepage and suction recovery rate reaches 31.3 percent, the seepage and suction recovery rate is greatly improved, the seepage and suction development of the compact oil is realized, the moisture of the hole on the surface of the compact reservoir rock must be water-wet, the reverse wetting of the surface of the rock must be realized when the surface of the compact reservoir rock is oil-wet, and the oil-wet surface is changed into a water-wet surface. The seepage and suction displacement agent is a compact reservoir rock surface wetting reversal agent, so that the oil wetting of the compact reservoir rock surface is reversed to the water wetting, even if the inclination angle of the water on the rock surface is reduced from theta being more than or equal to 90 degrees to theta being less than 90 degrees, and the purpose of crude oil seepage and suction development in the compact reservoir is realized.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious 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.