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Mineralization degree sensitive diversion temporary plugging agent and preparation method and application thereof

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

Active Publication Date: 2020-05-05
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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  • Mineralization degree sensitive diversion temporary plugging agent and preparation method and application thereof
  • Mineralization degree sensitive diversion temporary plugging agent and preparation method and application thereof
  • Mineralization degree sensitive diversion temporary plugging agent and preparation method and application thereof

Examples

Experimental program
Comparison scheme
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 particularly relates to a mineralization degree sensitive diversion temporary plugging agent and a preparation method and application thereof. The mineralization degree sensitive type diversion temporary plugging agent is prepared from the following raw materials: 20.0-25.0 percent of olefin sulfonic acid, 10.0-20.0 percent of sodium octylsulfate, 3.0-5.0 percent of sodium alkyl sulfate, 20.0-25.0 percent of methanol and the balance of water. The mineralization degree sensitive diversion temporary plugging agent is used in a reservoir diversion acidification construction process. In the acidification process of the mineralization degree sensitive type diversion temporary plugging agent, whenthe concentration of calcium ions generated in the reaction process of an acid liquid and a stratum is increased to 2% or above, micelles of 5-200 microns are formed, the stratum high-permeability layer can be plugged, the acid liquid is promoted to turn to a low-permeability reservoir to be transformed, and the water injection profile is improved; after acidification is finished and water injection is recovered, the formed micelles can be rapidly dissolved in water, and finally the purposes of pressure reduction and yield increase are achieved.

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 Applications(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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