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A salinity-sensitive shunt temporary plugging agent and its preparation method and application

A technology of salinity and temporary plugging agent, applied in chemical instruments and methods, earthwork drilling, wellbore/well components, etc., can solve problems such as poor diversion effect and cumbersome construction process, so as to promote acid liquid diversion and improve The effect of water absorption profile

Active Publication Date: 2021-11-30
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conventional diversion acidizing technology is to inject temporary plugging agent in the form of a slug during the acidification process, and then inject acid liquid to promote the acid liquid to enter the low-permeability layer and adjust the profile. The construction process is cumbersome and the diversion effect is poor.

Method used

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  • A salinity-sensitive shunt temporary plugging agent and its preparation method and application
  • A salinity-sensitive shunt temporary plugging agent and its preparation method and application
  • A salinity-sensitive shunt temporary plugging agent and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0034] A salinity-sensitive shunting temporary plugging agent, comprising olefin sulfonic acid, sodium octyl sulfate, sodium lauryl sulfate, methanol and water; the mass percentages of each component are: olefin sulfonic acid is 20.0%-25.0% %, sodium octyl sulfate is 10.0%-20.0%, sodium lauryl sulfate is 3.0%-5.0%, methanol is 20.0%-25.0%, and the balance is water.

[0035] In actual use, the mass percent of olefin sulfonic acid used in the present invention is 20.0%-25.0%, so that when the calcium ion concentration produced in the acid liquid and formation reaction process is raised to more than 2.0%, the olefin sulfonic acid and calcium ion can Form micelles of 5-50 microns, and form bridging ions in the percolation channel to play a role in bridging. The mass percentage of sodium octyl sulfate is 10.0%-20.0%, so that when the concentration of calcium ions generated during the reaction between the acid liquid and the formation rises to more than 3%, sodium octyl sulfate and ...

Embodiment 2

[0046] A salinity-sensitive shunt temporary plugging agent, the difference from Example 1 is that the mass percentages of the olefin sulfonic acid, octyl sodium sulfate, lauryl sodium sulfate, methanol and water are: olefin 20.0% of sulfonic acid, 10.0% of sodium octyl sulfate, 3.0% of sodium lauryl sulfate, 20.0% of methanol, and the balance is water.

[0047] The salinity-sensitive shunt temporary plugging agent prepared according to the above composition ratio was first field tested in an oilfield. The test well is a water well, and the water absorption profile shows that the upper layer absorbs 82% of water and the lower layer absorbs 18%. In order to further adjust the water absorption profile and improve the degree of water driving, a technical test on the adjustment of the mineralization degree control profile was carried out.

[0048] The salinity-sensitive shunting temporary plugging agent of the present invention is added to the acid liquid at a concentration of 1.5% ...

Embodiment 3

[0053] A salinity-sensitive shunt temporary plugging agent, the difference from Example 1 is that the mass percentages of the olefin sulfonic acid, octyl sodium sulfate, lauryl sodium sulfate, methanol and water are: olefin 25.0% of sulfonic acid, 20.0% of sodium octyl sulfate, 5.0% of sodium lauryl sulfate, 25.0% of methanol, and the balance is water.

[0054] The salinity-sensitive shunt temporary plugging agent prepared according to the above composition ratio was first field tested in an oilfield. The test well is a water well, and the water absorption profile shows that the upper layer absorbs 93% of water and the lower layer absorbs 7%. In order to further adjust the water absorption profile and improve the degree of water driving, a technical test on the adjustment of the mineralization degree control profile was carried out.

[0055] The acid control diversion agent of the present invention is added to the acid solution, and the concentration is 3.0% of the volume of ...

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Abstract

The invention belongs to the technical field of reservoir diversion acidification construction, and in particular relates to a salinity-sensitive diversion temporary plugging agent and its preparation method and application. The salinity-sensitive shunting temporary plugging agent of the present invention is composed of the following raw materials: 20.0%-25.0% olefin sulfonic acid, 10.0%-20.0% octyl sodium sulfate, 3.0%-5.0% dodecyl sodium sulfate , 20.0%‑25.0% methanol, the balance being water. The salinity-sensitive diversion temporary plugging agent of the present invention is used in the construction process of reservoir diversion acidification. During the acidification process, the salinity-sensitive diversion temporary plugging agent will reduce the concentration of calcium ions produced during the reaction between the acid liquid and the formation. When it rises to more than 2%, 5-200 micron micelles are formed, which can block the high-permeability layer of the formation, promote the acid solution to turn to the low-permeability layer for transformation, and improve the water absorption profile; after the acidification is completed and the water injection is resumed, the formed The micelles can be quickly dissolved in water, and finally achieve the purpose of reducing blood pressure and increasing production.

Description

technical field [0001] The invention belongs to the technical field of reservoir diversion acidification construction, and in particular relates to a salinity-sensitive diversion temporary plugging agent and its preparation method and application. Background technique [0002] In the process of oilfield water injection development, as the development progresses, the water injection profile will be uneven due to the vertical heterogeneity of the reservoir and other factors. At this time, the injected water will rush along the high permeability layer, making the medium The low-permeability layer is not or difficult to be swept by the injected water, thus reducing the volumetric sweep coefficient of the injected water. The injection pressure at the wellhead of some injection wells even reached 35MPa, and some formations were still under-injected. Conventional diversion acidizing technology is to inject temporary plugging agent in the form of a slug during the acidification pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/506E21B33/13
CPCC09K8/506E21B33/13
Inventor 王勇姚斌张随望姬振宁陆小兵邓志颖王尔珍隋蕾王俊涛王薇
Owner PETROCHINA CO LTD
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