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A preparing method of a flocculant used for treating waste drilling fluid

A technology for discarding drilling fluids and flocculants, applied in the field of oilfield chemistry, can solve the problems of failing to meet discharge standards, high sludge moisture content, general flocculation effect, etc., and achieve the effects of easy operation, simple preparation process and excellent flocculation performance.

Active Publication Date: 2018-12-14
CHINA PETROLEUM & CHEM CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Commercially available flocculants for solid-liquid separation of waste drilling fluids in oil fields are mainly acrylamide-based cationic polymers. The molecular chains of this type of flocculants are easy to curl in waste drilling fluids with high salinity. Therefore, this type of flocculants The amount of flocculation effect is often large, and the flocculation effect is average. The sludge after solid-liquid separation and dehydration of waste drilling fluid has a high moisture content and cannot meet the discharge standard.

Method used

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  • A preparing method of a flocculant used for treating waste drilling fluid
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  • A preparing method of a flocculant used for treating waste drilling fluid

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Embodiment 1

[0031] Example 1. Preparation of flocculant for treating waste drilling fluid

[0032] Follow the steps below to prepare a flocculant for treating waste drilling fluid:

[0033] (1) Preparation of cationic monomer solution

[0034] Dissolve 6g of tetraethylenepentamineheptaacetic acid in 100mL of deionized water, adjust the pH of the solution to 8.5, and then add 15g of methacryloyloxyethyltrimethylammonium chloride dropwise to the tetraethylenepentamineheptaacetic acid aqueous solution, After 30 minutes of dripping, stir at room temperature for 15 minutes to obtain a cationic monomer solution.

[0035] (2) Preparation of flocculant

[0036] Add 150g of deionized water, cationic monomer solution, and 85g of acrylamide into a three-necked glass bottle equipped with a stirrer, a nitrogen pipe and a thermometer, control the temperature at 8°C, adjust the pH to 7.5, stir and blow in nitrogen When the acrylamide is completely dissolved, add 1 mg ferrous sulfate, 0.1 mg tetrameth...

Embodiment 2

[0037] Example 2, preparation of flocculant for treating waste drilling fluid

[0038] The amount of tetraethylenepentamine heptaacetic acid added in step (1) is 4.5g, other steps are with reference to embodiment 1.

Embodiment 3

[0039] Example 3, preparation of flocculant for treating waste drilling fluid

[0040] In the step (1), the polycarboxylic acid compound is pentaethylenehexamine octaacetic acid, and the weight is 6g. Other steps refer to Example 1.

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Abstract

A preparing method of a flocculant used for treating waste drilling fluid is disclosed. Through addition of a monomer with high activity, a high-molecular-weight product having a high cationic degreeand high molecular chain rigidity can be prepared easily. Through electrostatic repulsion among micro blocked cationic chain segments in the polymer molecular chain, molecular chain rigidity is enhanced, so that the polymer exists in a stretched conformation in the waste drilling fluid having a high degree of mineralization, thus improving adsorption, bridging and flocculation properties of polymer. Accordingly, a polymer flocculant prepared by the method can play a role of neutralizing negative charges, can adsorb and bridge particles in drilling fluid and can obviously enhance solid-liquid separation effects.

Description

technical field [0001] The invention relates to the technical field of oilfield chemistry, in particular to a preparation method of a flocculant used for treating waste drilling fluid. Background technique [0002] Waste drilling fluid is a major pollutant produced during oilfield drilling. Waste drilling fluid is a multi-component dispersion system mainly composed of water, clay, drilling cuttings, flocculants, drilling fluid additives, oils, inorganic salts, etc. Treatment Improper use will cause great harm to the local environment. In the prior art, there are several methods for treating abandoned drilling fluid: gravity separation, pressure separation, solid-liquid separation, baffle block, spray separation, parallel sieve plate and vacuum separation, among which solid-liquid separation is considered the most effective , the most widely used separation method. The solid-liquid separation of waste drilling fluid is a basic step to reduce the volume of drilling waste and...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F220/34C02F1/56
CPCC02F1/56C08F220/56C08F220/34
Inventor 赵梓平王波张磊陈菊林刚卓龙成沐永青丰光韩超胡文东
Owner CHINA PETROLEUM & CHEM CORP