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A kind of descaling agent for oil field water injection well and preparation method thereof

A technology for oil field water injection and descaling agent, which is applied to chemical instruments and methods, earthwork drilling, wellbore/well components, etc.

Active Publication Date: 2017-01-25
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] These can effectively remove the scaling of certain components, but the scaling components of water injection wells are complex, and the application of these scaling agents has certain limitations

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Embodiment 1: a kind of descaling agent for oil field water injection well, each component active ingredient weight percent is:

[0045] Hydrochloric acid (mass concentration 28-38%): 10% (active ingredients are calculated as HCl);

[0046] Sodium acetate: 1%;

[0047] Sodium citrate: 1.5%;

[0048] Sodium fluoride: 1.5%;

[0049] Sodium potassium tartrate: 3%;

[0050] Polyoxyethylene rosin acid: 0.5%;

[0051] Pull open powder: 0.2%;

[0052] Sodium di-sec-octyl maleate sulfonate: 1%;

[0053] Solid chlorous anhydride: 0.6% (the active ingredient is represented by ClO 2 count);

[0054] Hydroxyethylidene diphosphonic acid: 1.2%;

[0055] Water: 79.5%;

[0056] The sum of the weight percentages of each component is 100%.

[0057]A preparation method of a descaling agent for oilfield water injection wells: first, under normal temperature conditions, add water into an acid-resistant liquid mixing tank with a stirrer, and mix sodium acetate, sodium citrate, pota...

Embodiment 2

[0062] Embodiment 2: oil field water injection well descaling agent, each component active ingredient weight percent is:

[0063] Hydrochloric acid (mass concentration: 28-38%): 15% (active ingredients are calculated as HCl);

[0064] Sodium acetate: 0.2%;

[0065] Sodium citrate: 0.5%;

[0066] Sodium fluoride: 0.1%;

[0067] Sodium potassium tartrate: 2%;

[0068] Polyoxyethylene rosin acid: 0.5%;

[0069] Pull open powder: 0.4%;

[0070] Sodium di-sec-octyl maleate sulfonate: 1.5%;

[0071] Solid chlorous anhydride: 0.6% (the active ingredient is represented by ClO 2 count);

[0072] Hydroxyethylidene diphosphonic acid: 1.5%;

[0073] Water: 77.7%

[0074] The sum of the weight percentages of each component is 100%.

[0075] The preparation process of embodiment 2 is identical with embodiment 1.

[0076] The basic performance of embodiment 2:

[0077] Example 2 color Corrosion (mg / cm 2 h)

[0078] Example 2 Application effect: Well Liu 86-50 in J...

Embodiment 3

[0079] Embodiment 3: oil field water injection well descaling agent, each component active ingredient weight percentage is:

[0080] Hydrochloric acid (mass concentration: 28-38%): 5% (active ingredients are calculated as HCl);

[0081] Sodium acetate: 0.1%;

[0082] Sodium citrate: 0.1%;

[0083] Sodium fluoride: 3%;

[0084] Sodium potassium tartrate: 1%;

[0085] Polyoxyethylene rosin acid: 0.5%;

[0086] Pull open powder: 0.4%;

[0087] Sodium di-sec-octyl maleate sulfonate: 1.5%;

[0088] Solid chlorous anhydride: 0.1% (the active ingredient is represented by ClO 2 count);

[0089] Hydroxyethylidene diphosphonic acid: 0.5%;

[0090] Water: 87.8%;

[0091] The sum of the weight percentages of each component is 100%.

[0092] The preparation process of embodiment 3 is identical with embodiment 1.

[0093] The basic performance of embodiment 3:

[0094] Example 3 color Corrosion (mg / cm 2 h)

[0095] Example 3 Application effect: Well Liu 64-70 in ...

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PUM

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Abstract

The invention discloses an oil-field water injection well descaling agent and a preparation method thereof, and belongs to the technical field of oil field exploitation. The oil-field water injection well descaling agent is used for removing scale formed on a water injection well pipe wall in water-injection development so that water-injection efficiency is improved. The oil-field water injection well descaling agent comprises, by weight, 5-15% of hydrochloric acid (having a concentration of 28-38%), 0.1-1.5% of sodium acetate, 0.1-1.5% of sodium citrate, 0.1-8.5% of sodium fluoride, 1-6% of potassium sodium tartrate, 0.05-0.5% of rosin-polythylene oxide ester, 0.05-0.4% of nekal BX, 0.2-1.5% of sodium di-sec-octylmal-eacesulfonate, 0.1-0.6% of solid chlorous anhydride, 0.5-1.5% of hydroxy ethidene diphosphonic acid and the balance water. The oil-field water injection well descaling agent can effectively remove carbonate scale, sulfate scale, ferrous sulfide scale, grease stain and silicate scale in the water injection well, has an oil casing and injection device corrosion degree less than 0.5994mg / cm<2>h and does not discharge toxic gas such as H2S.

Description

technical field [0001] The invention relates to the technical field of oilfield development, and relates to an oilfield water injection well descaling agent and a preparation method thereof, which are used for removing various types of scaling formed on the pipe wall of the water injection well during the oilfield water injection development process and improving water injection efficiency. Background technique [0002] At present, in the process of oilfield water injection development, the injected water is often surface water, formation water or even sewage, which contains a large amount of Ca 2+ , Mg 2+ 、Ba 2+ 、Si 2+ , SO 4 2- 、HCO 3 - After these ions enter the wellbore, with the change of temperature and pressure and the action of sulfate-reducing bacteria SRB, etc., it is easy to form scale. In addition, the iron wellbore in O 2 、H 2 S, CO 2 And under the action of iron bacteria, etc., it is easy to generate rust and ferrous sulfide scale. After these scales...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/528C09K8/524E21B37/06
CPCC09K8/524C09K8/528E21B37/06
Inventor 高春宁李文宏范伟张永强庞岁社王丽莉张宏强徐飞艳李姝蔓
Owner PETROCHINA CO LTD
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