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Oil well deep thick oil blocking remover and preparation method and use method thereof

A plugging agent and deep-seated technology, applied in chemical instruments and methods, earthwork drilling, wellbore/well components, etc., can solve problems such as poor anti-swelling effect, high acid strength, oil-water emulsification, and flowback difficulties, and achieve The effect of slow response

Pending Publication Date: 2021-06-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the composite system composed of inorganic acids has high acid strength, is easy to damage the reservoir framework, and has a high corrosion rate of steel, which is mainly aimed at low-permeability reservoirs; emulsified composite acids are likely to cause oil-water emulsification and very difficult flowback, and can only For calcareous and colloidal plugging; the composite oxidized composite plugging remover has certain safety risks, and it is only for drilling fluid plugging
[0007] In addition, there is also the problem of the combination of cost and effect. Currently, there are many types of cleaning and plugging removers used in oil fields, most of which are very specific and have great differences in performance for different oil products. Among them, the oil-based type is used The cleaning effect of the product is good, but the overall cost is high. The price of commonly used products in the market is generally 9,000-11,000 yuan / ton. The water-based products generally have poor anti-swelling effect, and additional anti-swelling agents need to be added for treatment, thus increasing the operating cost.

Method used

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  • Oil well deep thick oil blocking remover and preparation method and use method thereof
  • Oil well deep thick oil blocking remover and preparation method and use method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Oil well deep layer heavy oil plugging remover, including A group of plugging remover, B group of plugging remover, C group of plugging remover, the quality of A group of plugging remover, B group of plugging remover, C group of plugging remover mentioned in s The ratio is 9.4:1.2:4.1;

[0029] in:

[0030] Group A deblocking agent, in parts by mass, includes 21 parts of phosphoric acid, 1.4 parts of citric acid, 0.2 parts of fluoboric acid, 1.5 parts of dimethyl ketoxime, 0.5 parts of glutamine, 3 parts of imidazoline, and 0.6 parts of water;

[0031] Group B deblocking agent, in parts by mass, includes 42 parts of alkyl polyoxyethylene ether, 7 parts of polyoxyethylene tert-octylphenol ether, 25 parts of hydroxypropyl cellulose, 1.4 parts of ferrous sulfate, and 0.5 parts of water;

[0032] The clogging agent of component C, in parts by mass, includes 15 parts of hydrofluoric acid, 1.2 parts of ammonium chloride, 5.5 parts of iron ion stabilizer, 0.1 part of butyl gl...

Embodiment 2

[0042] Oil well deep layer heavy oil plugging remover, including A group of plugging remover, B group of plugging remover, C group of plugging remover, the quality of A group of plugging remover, B group of plugging remover, C group of plugging remover mentioned in s The ratio is 11:1:5;

[0043] in:

[0044] Group A deblocking agent, in parts by mass, includes 20 parts of phosphoric acid, 2 parts of citric acid, 0.4 parts of fluoboric acid, 2 parts of dimethyl ketoxime, 0.6 parts of glutamine, 3 parts of imidazoline, and 0.5 parts of water;

[0045] Group B deblocking agent, in parts by mass, includes 45 parts of alkyl polyoxyethylene ether, 5-8 parts of polyoxyethylene tert-octylphenol ether, 26 parts of hydroxypropyl cellulose, 1.3 parts of ferrous sulfate, and 0.5 parts of water share;

[0046] The clogging agent of component C, in parts by mass, includes 18 parts of hydrofluoric acid, 2 parts of ammonium chloride, 6 parts of iron ion stabilizer, 0.1 part of butyl glycol...

Embodiment 3

[0056] Oil well deep layer heavy oil plugging remover, including A group of plugging remover, B group of plugging remover, C group of plugging remover, the quality of A group of plugging remover, B group of plugging remover, C group of plugging remover mentioned in s The ratio is 10:1:5;

[0057] in:

[0058] Group A deblocking agent, in parts by mass, includes 23 parts of phosphoric acid, 2 parts of citric acid, 0.2 part of fluoboric acid, 1 part of dimethyl ketoxime, 0.6 part of glutamine, 2 parts of imidazoline, and 0.5 part of water;

[0059] Group B deblocking agent, in parts by mass, includes 45 parts of alkyl polyoxyethylene ether, 6 parts of polyoxyethylene tert-octylphenol ether, 20 parts of hydroxypropyl cellulose, 1.4 parts of ferrous sulfate, and 0.6 parts of water;

[0060] The clogging agent of component C, in parts by mass, includes 16 parts of hydrofluoric acid, 1.6 parts of ammonium chloride, 6 parts of iron ion stabilizer, 0.2 parts of butyl glycol ether, 1....

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Abstract

The invention relates to an oil well deep thick oil blocking remover and a preparation method and a use method thereof. A component A blocking remover comprises phosphoric acid, citric acid, fluoboric acid, dimethyl ketoxime, glutamine, imidazoline and water. A component B blocking remover comprises alkyl polyoxyethylene ether, polyoxyethylene tert-octyl phenol ether, hydroxy propyl cellulose, ferrous sulfate and water. A component C blocking remover comprises hydrofluoric acid, ammonium chloride, an iron ion stabilizer, ethylene glycol butyl ether, sodium hypochlorite and water. The blocking remover provided by the invention has a slow reaction speed with stratum rocks, and can go deep into the deep part of the stratum to remove various blockages in deep oil layers of oil fields and oil wells and water injection layers of water injection wells. Meanwhile, under the condition that the functions and properties of all the components are comprehensively considered, the synergistic effect of all the components is utilized, so that the injected blocking remover not only has a blocking removal effect on a water injection well, but also has profile control and displacement and oil displacement effects, and has a blocking removal effect on a deep oil well and a foam huff and puff effect at the same time.

Description

technical field [0001] The invention relates to an oil well deep layer heavy oil plugging removal agent and a preparation method and a use method thereof, which belong to the technical field of heavy oil reservoir exploitation. Background technique [0002] In the field of oil extraction, in order to keep water wells and oil wells unobstructed, crude oil is continuously replaced by injecting water, which is the central link of oil extraction engineering. However, oil wells and water injection wells are often easily blocked, especially as the oilfield enters the middle and late stages of development, due to long-term water injection, especially the injection of unfiltered sewage into the formation, and in some cases, downhole operation measures and formation temperature and pressure drop The downhole conditions of water injection wells have become worse, and the types of formation pollution and blockages have become more complicated and diversified, which can be roughly divid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/52C09K8/58C09K8/584E21B37/06
CPCC09K8/52C09K8/58C09K8/584E21B37/06
Inventor 刘宁张守鹏滕建彬方正伟李博张存霞王长轩于剑飞
Owner CHINA PETROLEUM & CHEM CORP