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Barium strontium sulphate scale inhibitor for oil field and application thereof

A technology of scale inhibitor and barium sulfate, which is applied in the field of barium strontium sulfate scale inhibitor in oilfields, can solve the problems of frequent operation, low anti-scale efficiency of chemical scale inhibitors, pipeline blockage, etc., and achieve high chelation dispersion performance, excellent Anti-scaling performance, good effect

Active Publication Date: 2014-06-04
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] The common scaling products in oil fields are mainly calcium carbonate, but in recent years, with the development of Changqing, some key development blocks have appeared that the injected water is rich in SO 4 2- , the formation water is rich in Ba 2+ / Sr 2+ , the incompatibility of the two causes the surface pipeline network and gathering and transportation sites to use Ba(Sr)SO 4 Severe fouling problem mainly caused by pipeline blockage, frequent operation and other problems, affecting crude oil production and becoming an important factor affecting oilfield development
[0003] At present, the chemical antiscalants used in oilfields are mainly organophosphoric acids, which are used for high SO in oilfields. 4 2- (SO 4 2- ≤1600mg / l), high Ba 2+ / Sr 2+ (Ba 2+ / Sr 2+ ≤1800mg / l) ion content caused by barium strontium sulfate anti-scaling problem, the anti-scaling efficiency of existing chemical anti-scaling agent is low (anti-scaling rate <40%), can not effectively control scaling, research an economical and effective Barium strontium sulfate scale inhibitor for oilfields is extremely urgent to ensure long-term stable production of oilfields

Method used

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  • Barium strontium sulphate scale inhibitor for oil field and application thereof
  • Barium strontium sulphate scale inhibitor for oil field and application thereof
  • Barium strontium sulphate scale inhibitor for oil field and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Add quantitative water into a steel reactor with a capacity of 1000 liters, add polyepoxysuccinic hydrochloride with a weight content of 0.05%, stir evenly, measure the pH value of the solution, and add polyaminopolyether with a weight content of 0.03% Methylene phosphonic acid, stir to dissolve completely, then add 0.05% by weight of ZG-558 antiscalant, 0.01% by weight of polyquaternium, and the balance is water, stir evenly to obtain the product.

[0042] The site fouling rate was 2.0mm / a before dosing, and 0.2mm / a after dosing, and the scaling rate was reduced by 10 times.

Embodiment 2

[0044] In a steel reaction kettle with a capacity of 1000 liters, add quantitative water, add polyepoxysuccinic hydrochloric acid with a weight content of 0.07%, stir evenly, measure the pH value of the solution, and add a polyamino polyether with a weight content of 0.03% Methylene phosphonic acid, stir to dissolve completely, then add 0.02% by weight of ZG-558 scale inhibitor, 0.01% by weight of polyquaternium, and the balance is water, stir evenly to obtain the product.

[0045] The site fouling rate was 15.0mm / a before dosing, and 0.4mm / a after dosing, and the scaling rate was reduced by 38 times.

Embodiment 3

[0047] Add quantitative water into a steel reactor with a capacity of 1000 liters, add polyepoxysuccinic hydrochloride with a weight content of 0.10%, stir evenly, measure the pH value of the solution, and add a polyamino polyether with a weight content of 0.02% Methylene phosphonic acid, stir to dissolve completely, then add 0.02% by weight of ZG-558 antiscalant, 0.02% by weight of polyquaternium, and the balance is water, stir evenly to obtain the product.

[0048] The site fouling rate was 4.0mm / a before dosing, and 0.1mm / a after dosing, and the scaling rate was reduced by 40 times.

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Abstract

The invention relates to a barium strontium sulphate scale inhibitor for an oil field and an application thereof. The barium strontium sulphate scale inhibitor comprises the following components in percentage by weight: 0.05-0.10% of polyepxoysuccinic acid, 0.01-0.03% of polyamino polyether methylene phosphonate, 0.02-0.05% of a ZG-558 scale inhibitor, 0.01-0.02% of quaternary ammonium salt and the balance of water; and working concentration is 50-120mg / l when the barium strontium sulphate scale inhibitor is used for inhibiting barium strontium sulphate scale at a gathering and transportation station of the oil field. The barium strontium sulphate scale inhibitor provided by the invention can effectively realize barium strontium sulphate scale inhibition with high sulphuric acid content (SO4<2-> is less than or equal to 1600mg / l) and high barium content (the ratio of Ba<2+> to Sr<2+> is less than or equal to 1800mg / l), and scale inhibition rate is more than 70%.

Description

technical field [0001] The invention relates to an oilfield barium strontium sulfate scale inhibitor and its application. Background technique [0002] The common scaling products in oil fields are mainly calcium carbonate, but in recent years, with the development of Changqing, some key development blocks have appeared that the injected water is rich in SO 4 2- , the formation water is rich in Ba 2+ / Sr 2+ , the incompatibility of the two causes the surface pipeline network and gathering and transportation sites to use Ba(Sr)SO 4 Severe fouling, mainly caused by fouling, has caused a series of problems such as pipeline blockage and frequent operations, affecting crude oil production and becoming an important factor affecting oilfield development. [0003] At present, the chemical antiscalants used in oilfields are mainly organophosphoric acids, which are used for high SO in oilfields. 4 2- (SO 4 2- ≤1600mg / l), high Ba 2+ / Sr 2+ (Ba 2+ / Sr 2+ ≤1800mg / l) ion conte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F5/10C02F5/14
Inventor 刘爱华杨全安何治武刘宁张明霞李宁军董俊王小勇唐泽玮杨会丽
Owner PETROCHINA CO LTD
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