Scale remover used for long-acting pressure decrease and injection increase of water injection well

A descaling agent and technology for water injection wells, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems such as mismatch between acid liquid and scale samples, short effective period of measures, and poor descaling effect, etc., to reduce Water injection pressure, increase water injection volume, good anti-swelling effect

Active Publication Date: 2017-03-22
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Calcium carbonate, calcium sulfate, barium sulfate and other scales are serious in some oil production blocks of Changqing Oilfield. Acidification measures are usually adopted, but there is a problem of mismatch between acid solution and scale samples. The effective period of the measures is short, resulting in poor descaling effect

Method used

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  • Scale remover used for long-acting pressure decrease and injection increase of water injection well
  • Scale remover used for long-acting pressure decrease and injection increase of water injection well
  • Scale remover used for long-acting pressure decrease and injection increase of water injection well

Examples

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Effect test

preparation example Construction

[0028] The preparation method of above-mentioned descaling agent, concrete steps are as follows:

[0029] (1) To the dry enamel reaction kettle, add 12-14 parts of water, 25-30 parts of organic phosphonic acid carboxylic acid scale inhibitor, 5-8 parts of anionic surfactant, 10-12 parts of polyoxygen Ethylene sorbitan monooleate, 13-15 parts of polyamino polyether group methylene phosphoric acid, stirring;

[0030] (2) Add 3-6 parts of silicone surfactant while stirring until all solvents are completely mixed;

[0031] (3) Heat the reactor to 72°C to 78°C for 1 to 4 hours, then cool to room temperature;

[0032] (4) Add 15-18 parts of diluent and 2-5 parts of dispersant, discharge, and complete the preparation of descaling agent for long-term depressurization and injection increase of water injection wells.

[0033] The above medicament components are all commercially available chemicals.

[0034] The descaling agent for water injection wells synthesized by the invention fo...

Embodiment 1

[0036] This example provides a descaling agent for long-term decompression and increasing injection in water injection wells. The descaling agent is composed of the following components in parts by mass: 10 parts of polyoxyethylene sorbitan monooleate; 25 parts of organic phosphonic acid carboxylic acid scale inhibitor; 5 parts of anionic surfactant; 3 parts of silicone surfactant; 2 parts of dispersant; 15 parts of diluent; .

[0037] The preparation method of the above scale remover is to add 12 parts of water, 25 parts of organic phosphonic acid carboxylic acid scale inhibitors, 5 parts of anionic surfactants, 10 parts of polyoxyethylene sorrel into a dry enamel reaction kettle. Alcohol monooleate, 13 parts of polyaminopolyether-based methylene phosphoric acid, stirring; while stirring, add 3 parts of silicone surfactant until the various solvents are completely mixed; heat the reactor to 72 ° C for 1 hour , cooled to room temperature; 15 parts of diluent and 2 parts of di...

Embodiment 2

[0045] The present embodiment takes 11 parts of polyoxyethylene sorbitan monooleate; 26 parts of tricarboxylic butanephosphonic acid; 6 parts of α-sulfomonocarboxylic acid; 4 parts of cyclic polysiloxane; triethylhexyl 3 parts of phosphoric acid; 16 parts of industrial ethanol; 14 parts of polyamino polyether methylene phosphoric acid; 13 parts of water, and make a descaling agent according to the above-mentioned preparation method, and inject the descaling agent with a concentration of 0.2% into multiple ports continuously for 1 week For under-injection wells, during the time period of injection, detect the corrosion rate of the scale remover provided in this embodiment to equipment and pipe strings, the anti-expansion rate, shrinkage rate, and resistance to calcium carbonate and calcium sulfate of the scale remover. The scale inhibition rate, as well as the surface tension and interfacial tension of this scale remover, the performance and effect of specific testing are shown ...

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Abstract

The present invention provides a scale remover used for long-acting pressure decrease and injection increase of a water injection well, and the scale remover comprises the following components: 10-12 parts of Tween 80; 25-30 parts of 2-Phosphonobutane-1,2,4-tricarboxylic acid; 5-8 parts of dodecylbenzene sulfonic acid; 3-6 parts of an organosilicon surfactant; 2-5 parts of ethylene glycol butyl ether; 15-18 parts of n-butanol; 13-15 parts of polyamino polyether methylene phosphate and 12-14 parts of water. The scale remover has good anti swelling and swelling shrinkage capability and low surface and interface tension, and the scale remover reduces deformation work when liquid droplets pass through a narrow hole neck, reduces capillary resistance, greatly reduces the deformation work when the liquid droplets in a pore medium are pulled to spread on the surface of a rock so as to increase the moving speed of the liquid droplets in formation pores. After being injected into formation, the scale remover reduces the interfacial tension, meanwhile can restore an original water channel, reduce water injection pressure and improve water injection amount by dissolution of calcium carbonate, calcium sulfate and other precipitates near a wellbore area so as to ensure that the original water injection system is normal.

Description

technical field [0001] The invention belongs to the field of water injection development in oil fields, and in particular relates to a scale remover for water injection wells for long-term pressure reduction and injection enhancement and a preparation method thereof. Background technique [0002] Changqing Oilfield has low permeability, poor reservoir physical properties, and difficult production. As the main means of long-term stable production of oilfields, water injection development has been widely used. However, due to factors such as organic impurities in the injected water, excessive minerality, and incompatibility between the injected water and the formation water, bacteria and structures are likely to be produced in the well-introduced zone, which will block the well-introduced zone, resulting in insufficient water injection into the well, affecting oil production. Tibetan long-term stable production. [0003] For under-injection wells, chemical methods are often u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584C09K8/528
CPCC09K8/528C09K8/584C09K2208/12C09K2208/32
Inventor 王尔珍姚斌张随望陆小兵王勇宋昭杰隋蕾邓志颖
Owner PETROCHINA CO LTD
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