Corrosion and scale inhibitor used for acidic high temperature gas field water and preparation method and application thereof

A corrosion and scale inhibitor, gas field water technology, applied in chemical instruments and methods, mining wastewater treatment, descaling and water softening, etc., can solve the problem of failing to meet the requirements of anticorrosion and antiscaling, low rate of scale and corrosion inhibition, applicable Poor performance and other problems, to achieve the effect of prolonging the service life, reducing production and operation costs, and ensuring normal operation

CN105712504AActive Publication Date: 2016-06-29PETROCHINA CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2016-06-29

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Abstract

The present invention discloses a corrosion and scale inhibitor used for acidic high temperature gas field water and a preparation method and application thereof, and belongs to the technical field of water treatment. The corrosion and scale inhibitor includes the following components by weight: 10%-35% of a 2-phosphonobutane-1,2,4-tricarboxylic acid (PBTCA) water solution; 5%-20% of a 1-hydroxyethylidene-1,1-diphosphonic acid aqueous solution; 5%-20% of a polyamino polyether methylene phosphonate aqueous solution; 10%-25% of a phosphino / acrylic acid / sulfonate copolymer water solution; 5%-10% of an imidazoline derivative water-soluble corrosion inhibitor aqueous solution; 1%-3% of thiourea and balance of water. The corrosion and scale inhibitor can effectively prevent equipment and pipeline corrosion and fouling of 60-90 DEG C acidic high temperature gas field water with pH of 6-8, corrosion inhibiting rate can reach more than 70%, and calcium carbonate scale and calcium sulfate scale inhibition rate can reach more than 90%.
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Description

technical field

[0001] The invention relates to a corrosion and scale inhibitor for acid high-temperature gas well drainage and gas recovery and gas field water transportation and treatment, a preparation method and application, and belongs to the technical field of water treatment. Background technique

[0002] In order to improve the recovery rate of gas fields and realize stable production and resumption of production in old gas fields, gas fields generally adopt drainage gas recovery techniques such as foam drainage, pressurized gas lift drainage and electric submersible pump drainage. Since the gas field water contains a large amount of Ca 2+ , Mg 2+ 、HCO 3 - , SO 4 2- and Cl - Scaling and corrosive ions and H 2 S and CO 2 Such as acidic dissolved gas, high salinity and strong corrosion. During drainage gas recovery and gas field water transportation and treatment, gas field water is extracted from high-pressure formations to the surface system along with natur...

Examples

preparation example Construction

[0067] A second aspect of the present invention provides a method for preparing a corrosion and scale inhibitor for acidic high-temperature gas field water according to the first aspect of the present invention, the preparation method comprising the following steps:

[0068] Step (1), according to the proportions of the components in the corrosion and scale inhibitors defined in the first aspect of the present invention, water is added into the reactor and heated to 40-50°C, and then thiourea and imidazole are sequentially added under stirring conditions Aqueous solution of morphine derivative water-soluble corrosion inhibitor;

[0069] Step (2), after the aqueous solution of the thiourea and imidazoline derivatives corrosion inhibitors are uniformly mixed, then add 2 - aqueous solutions of phosphonobutane-1,2,4-tricarboxylic acid, aqueous hydroxyethylidene diphosphonic acid, aqueous solutions of polyaminopolyether methylene phosphonic acid and aqueous solutions of phosphino / a...

Embodiment 1

[0085] This embodiment provides three kinds of corrosion and scale inhibitors of the present invention and their preparation methods. The weight percentages of the components in the three kinds of scale inhibitors are shown in Table 1. The preparation methods are as follows:

[0086] Step (1), according to the ratio of the components shown in Table 1, add deionized water into the reaction kettle, after heating to 40-50°C, add thiourea and imidazoline amide water-soluble corrosion inhibitor in turn under stirring conditions agent aqueous solution;

[0087] Step (2), after the aqueous solution of thiourea and imidazoline derivative corrosion inhibitors are mixed evenly, according to the ratio of each component shown in Table 1, add 2-phosphonobutane-1,2 , 4-tricarboxylic acid (PBTCA) aqueous solution, hydroxy ethylidene diphosphonic acid (HEDP) aqueous solution, polyamino polyether group methylene phosphonic acid (PAPEMP) aqueous solution and BC-507 scale inhibitor aqueous solut...

Embodiment 2

[0092] This example evaluates the scale inhibition performance of the corrosion and scale inhibitor obtained in Example 1 on calcium carbonate scale.

[0093] Scale inhibition performance was evaluated with reference to the oil and gas industry standard SY / T5673-93 "Methods for Evaluation of Antiscalant Agents for Oilfields". Prepare simulated gas field water (the water quality of simulated gas field water in this embodiment is shown in Table 2), add a certain amount of corrosion and scale inhibitors obtained in Example 1 or commonly used corrosion and scale inhibitors in the prior art, under certain temperature conditions Leave it to stand for a certain period of time, and measure the scaling ions in water (in this embodiment, Ca 2+ Concentration) changes, according to the measurement results to calculate the scale inhibition rate.

[0094] Table 2 Calcium carbonate scale scale inhibition performance evaluation simulated gas field water quality

[0095]

[0096] The eval...