CN103555297B - Method for preparing environment-friendly oil field thickening agent from citrus peel and application - Google Patents

Abstract

The method for preparing an environment-friendly thickener for oil fields from citrus peels includes crushing and crushing naturally air-dried citrus peels, adding ethanol to the citrus peel particles in a reaction kettle, soaking them, and filtering the peel particles under reduced pressure. Until no solution flows out, dry to constant weight, mix the modified cellulose product with the peel of citrus plants, stir evenly, pulverize, and sieve to obtain an environmentally friendly thickener for oil fields. Dispersed in water-based drilling fluid, API standard is used to measure its fluid loss reducer and viscosity increaser, reduce fluid loss and increase viscosity, and the modified peel is used as fluid loss reducer and viscosity increaser for drilling fluid in oil field production agent.

Description

Method and application of environment-friendly oilfield thickener prepared from citrus peel

technical field

The invention relates to the technical field of application of citrus peels, in particular to a method and application for preparing an environment-friendly oilfield thickener from citrus peels.

Background technique

Citrus plants include tangerines, oranges, pomelo and lemons, etc., and are mainly distributed in Guangdong, Hunan, Zhejiang, Fujian and other places in China. my country's citrus cultivation area ranks first in the world, and its output ranks second in the world, second only to Brazil. Citrus peel is a by-product of citrus processing, accounting for about 25% to 40% of the whole fruit weight. At present, except for a small amount of food and feed additives, most of them become waste. Therefore, the recycling of citrus peel has a very broad prospect. , can produce huge economic and ecological benefits.

Contents of the invention

In order to expand the use of citrus peels and increase their added value, the object of the present invention is to provide a method and application for preparing an environment-friendly thickener for oilfields from citrus peels. The modified peels have enhanced solubility, dissolve Part of the glue has increased viscosity and can be used as fluid loss reducer and viscosifier for drilling fluid in oil field production.

In order to achieve the above object, the technical scheme adopted in the present invention is:

A method for preparing an environment-friendly thickener for oilfields from citrus peels, comprising the following steps:

In the first step, the naturally air-dried citrus peels are crushed to particles with a diameter of 1-5mm. The citrus peels are the residues after processing oranges, oranges, grapefruits, and lemons;

In the second step, add 5-20 times the mass of ethanol to the above-mentioned citrus peel particles in the reaction kettle, soak at 30-60°C for more than 30 minutes, and the ethanol is a product with a purity above industrial grade;

In the third step, the above-mentioned treated citrus peel particles are filtered under reduced pressure until no solution flows out, and dried at 50-80°C to constant weight;

The fourth step is to mix the modified cellulose product with the citrus peel according to the mass ratio of 10:1-1:10, stir evenly, pulverize, and pass through a 120-200 mesh sieve to obtain an environmentally friendly thickener for oil fields. Modified cellulose products are methyl cellulose, ethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, carboxymethyl cellulose or sodium carboxymethyl cellulose with a purity above industrial grade.

In application, the environment-friendly oilfield thickener is dispersed in the water-based drilling fluid with a mass concentration of 0.1-1%, and the API standard is used to measure its fluid loss reduction and viscosity increasing properties, and the fluid loss can be reduced by 40-70% , Increase the viscosity by 100-400%.

Because the present invention adopts citrus plant peel and modified cellulose as raw materials, it has natural environmental protection and renewability, and is easy to biodegrade, and the pectin and polyphenols contained in the peel are beneficial to improve its thickening effect. It enhances its adsorption with the surface of clay particles in drilling fluid, and at the same time, the fine particles can block the small pores in the mud cake, which is beneficial to improve its fluid loss control effect.

detailed description

The present invention will be further described below in conjunction with specific embodiments.

Example 1

A method for preparing an environment-friendly thickener for oilfields from citrus peels, comprising the following steps:

In the first step, the naturally air-dried citrus peels are crushed to particles with a diameter of 1-5mm, and the citrus peels are orange peels;

In the second step, add 5 times the mass of ethanol to the above-mentioned orange peel particles in the reaction kettle, soak for 60 minutes at 50°C, and the ethanol is an industrial grade product;

In the third step, the above-mentioned treated orange peel particles are filtered under reduced pressure until no solution flows out, and dried at 60°C to constant weight;

The fourth step is to mix the modified cellulose product and the orange peel according to the mass ratio of 1:2, stir evenly, pulverize, and pass through a 80-120 mesh sieve to obtain an environment-friendly oilfield thickener. The modified cellulose product used is Industrial grade carboxymethyl cellulose.

In application, the environment-friendly oilfield thickener is dispersed in the water-based drilling fluid with a mass concentration of 0.5%, and the fluid loss reduction and viscosity increase are measured by API standards, reducing fluid loss by 45% and increasing viscosity by 120% %.

Example 2

A method for preparing an environment-friendly thickener for oilfields from citrus peels, comprising the following steps:

In the first step, the naturally air-dried citrus peels are crushed to particles with a diameter of 1-5mm, and the citrus peels are orange peels;

In the second step, add 5 times the mass of ethanol to the above-mentioned orange peel particles in the reaction kettle, soak for 60 minutes at 60°C, and the ethanol is an industrial grade product;

The third step is to filter the above-mentioned treated orange peel particles under reduced pressure until no solution flows out, and dry at 50°C to constant weight;

The fourth step is to mix the modified cellulose product and the orange peel according to the mass ratio of 1:1, stir evenly, pulverize, and pass through a 80-120 mesh sieve to obtain an environment-friendly oilfield thickener. The modified cellulose product used is Industrial grade methyl cellulose.

In application, the environment-friendly oilfield thickener is dispersed in water-based drilling fluid with a mass concentration of 0.4%, and the API standard is used to measure its fluid loss reduction and viscosity increasing properties, reducing fluid loss by 50% and increasing viscosity by 150% %.

Example 3

A method for preparing an environment-friendly thickener for oilfields from citrus peels, comprising the following steps:

In the first step, the naturally air-dried citrus peels are crushed to particles with a diameter of 1-5mm, and the citrus peels are pomelo peels;

In the second step, add 8 times the mass of ethanol to the above-mentioned pomelo peel particles in the reaction kettle, soak for 50 minutes at 55°C, and the ethanol is an industrial grade product;

The third step is to filter the above-mentioned grapefruit peel particles under reduced pressure until no solution flows out, and dry at 65°C to constant weight;

The fourth step is to mix the modified cellulose product with the pomelo peel at a mass ratio of 5:1, stir evenly, pulverize, and pass through a 80-120 mesh sieve to obtain an environmentally friendly thickener for oilfields. The modified cellulose product used is Industrial grade ethyl cellulose.

In application, the environment-friendly oilfield thickener is dispersed in the water-based drilling fluid with a mass concentration of 0.6%, and the API standard is used to measure its fluid loss reduction and viscosity increasing properties, reducing fluid loss by 60% and increasing viscosity by 400% %.

Example 4

A method for preparing an environment-friendly thickener for oilfields from citrus peels, comprising the following steps:

In the first step, the naturally air-dried citrus peels are crushed to particles with a diameter of 1-5mm, and the citrus peels are orange peels;

In the second step, add 15 times the mass of ethanol to the above-mentioned orange peel particles in the reaction kettle, soak for 30 minutes at 60°C, and the ethanol is an industrial grade product;

In the third step, the above-mentioned treated orange peel particles are filtered under reduced pressure until no solution flows out, and dried at 70°C to constant weight;

The fourth step is to mix the modified cellulose product with the orange peel according to the mass ratio of 8:1, stir evenly, pulverize, and pass through a 80-120 mesh sieve to obtain an environment-friendly oilfield thickener. The modified cellulose product used is Technical grade hydroxyethyl cellulose.

In application, the environment-friendly oilfield thickener is dispersed in the water-based drilling fluid with a mass concentration of 0.8%, and its fluid loss reduction and viscosity increase are measured by API standards, reducing fluid loss by 50% and increasing viscosity by 320 %.

Example 5

A method for preparing an environment-friendly thickener for oilfields from citrus peels, comprising the following steps:

In the first step, the naturally air-dried citrus peels are crushed to particles with a diameter of 1-5mm, and the citrus peels are orange peels;

In the second step, add 20 times the mass of ethanol to the above-mentioned orange peel particles in the reaction kettle, soak for 45 minutes at 35°C, and the ethanol is an industrial grade product;

The third step is to filter the above-mentioned treated orange peel particles under reduced pressure until no solution flows out, and dry at 50°C to constant weight;

The fourth step is to mix the modified cellulose product and orange peel according to the mass ratio of 1:10, stir evenly, pulverize, and pass through a 80-120 mesh sieve to obtain an environmentally friendly thickener for oilfields. The modified cellulose product used is Industrial grade hydroxypropyl cellulose.

When applied, the environment-friendly oilfield thickener is dispersed in the water-based drilling fluid, and its mass concentration is 1%. The API standard is used to measure its fluid loss reduction and viscosity increase. It reduces the fluid loss by 55% and increases the viscosity by 400. %.

Example 6

A method for preparing an environment-friendly thickener for oilfields from citrus peels, comprising the following steps:

In the first step, the naturally air-dried citrus peel is crushed to particles with a diameter of 1-5mm, and the citrus peel is orange peel and orange peel with a mass ratio of 1:1;

In the second step, add 15 times the mass of ethanol to the above-mentioned orange peel and orange peel particles in the reaction kettle, soak for 50 min at 30°C, and the ethanol is an industrial grade product;

The third step is to filter the above-mentioned grapefruit peel particles under reduced pressure until no solution flows out, and dry at 60°C to constant weight;

The fourth step is to mix the modified cellulose product with the pomelo peel at a mass ratio of 1:8, stir evenly, pulverize, and pass through a 80-120 mesh sieve to obtain an environmentally friendly thickener for oilfields. The modified cellulose product used is Industrial grade sodium carboxymethyl cellulose.

When applied, the environment-friendly oilfield thickener is dispersed in the water-based drilling fluid, and its mass concentration is 1%. The API standard is used to measure its fluid loss reduction and viscosity increase. It reduces the fluid loss by 60% and increases the viscosity by 450. %.

Claims (1)

1. prepared the method for environment-friendly type oil field viscosifying agent by citrus plant pericarp, it is characterized in that, comprise the following steps:

The first step, rolls the citrus plant pericarp of natural air drying the particle being crushed to diameter 1-5mm, and citrus plant pericarp is the residuum after orange, orange, shaddock and lemon Fruit quality;

Second step, above-mentioned citrus plant pericarp particle is added in a kettle. the ethanol of 5-20 times of quality, soak more than 30min at 30-60 DEG C, ethanol is the product of the above purity of technical grade;

3rd step, by the citrus plant pericarp particle filtration under diminished pressure of above-mentioned process, flow out to without solution, 50-80 DEG C is dried to constant weight;

4th step, be that 10:1-1:10 mix with citrus plant pericarp according to mass ratio by modified fibre cellulose product, stir, pulverize, cross 120-200 mesh sieve, obtain environment-friendly type oil field viscosifying agent, modified fibre cellulose product used is the methylcellulose gum of the above purity of technical grade, ethyl cellulose, Natvosol, hydroxypropylcellulose, carboxymethyl cellulose or Xylo-Mucine.