Liquid film type microcapsule deep water blocking agent and its preparing method

A technology of microcapsules and water blocking agents, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of increased ground dehydration costs, reduced recovery, increased liquid drainage, etc., to improve utilization efficiency , simple construction process, high coagulation strength effect

Inactive Publication Date: 2007-04-11
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For water wells, if measures are not taken in time, there may be dead oil areas in the formation where water traps are trapped, and the injected water bypasses, thereby reducing the recovery rate and causing great waste
At the same time, due to the increase of water production, the dehydration cost of the ground will inevitably increase
Therefore, it is not cost-effective to increase the discharge volume of the oil well and carry the oil with the water

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] Example 1: Preparation of liquid film microcapsule deep water blocking agent

[0064] The components are formulated in the following percentages by weight:

[0065] Water glass (content 40%, modulus 3.3) 12%

[0066] Formaldehyde 3%

[0067] Cetyltrimethylammonium Bromide (CTAB) 1%

[0068] Aluminum citrate 0.7%

[0069] Lime 0.03%

[0070] water balance.

[0071] The preparation method of the above-mentioned liquid film type microcapsule deep water blocking agent comprises the following steps:

[0072] (1) with the amount of described weight percent of component respectively, make solvent with water, under 25 ℃, normal pressure condition, prepare chelating agent aluminum citrate solution, coating agent hexadecyl trimethyl ammonium bromide ( CTAB) solution, coagulant lime solution, activator formaldehyde solution, main agent water glass solution;

[0073] (2) Mix the above solution in a container at a temperature of 25° C., and make up the remaining water at the ...

Embodiment 2

[0076] Example 2: Preparation of liquid film microcapsule deep water blocking agent

[0077] The components are formulated in the following percentages by weight:

[0078] Water glass (content 40%, modulus 3.3) 10%

[0079] Formaldehyde 2%

[0080] Sodium dodecyl sulfate (SDS) 0.5%

[0081] Aluminum citrate 0.5%

[0082] Lime 0.01%

[0083] water balance.

[0084] The preparation method of the above-mentioned liquid film type microcapsule deep water blocking agent comprises the following steps:

[0085] (1) Use water as a solvent in the weight percentages of the components, and prepare a chelating agent aluminum citrate solution and a coating agent sodium dodecylsulfonate (SDS) solution at 20°C and under normal pressure. , coagulant lime solution, activator formaldehyde solution, main agent water glass solution;

[0086] (2) Mix the above solution in a container at a temperature of 20° C., and make up the remaining water at the same time to obtain a clarified mixed solu...

Embodiment 3

[0089] Example 3: Preparation of liquid film microcapsule deep water blocking agent

[0090] The components are formulated in the following percentages by weight:

[0091] Water glass (content 40%, modulus 3.3) 13%

[0092] Formaldehyde 4%

[0093] Cetyltrimethylammonium bromide (CTAB) 1.5%

[0094] Aluminum citrate 0.7%

[0095] Lime 0.04%

[0096] water balance.

[0097] The preparation method of the above-mentioned liquid film type microcapsule deep water blocking agent comprises the following steps:

[0098] (1) Use water as the solvent in the weight percentages of the components, and prepare the chelating agent aluminum citrate solution and the coating agent cationic surfactant hexadecyltrimethyl at 30°C and normal pressure. Ammonium bromide (CTAB) solution, coagulant lime solution, activator formaldehyde solution, main agent water glass solution;

[0099] (2) Mix the above solution in a container at a temperature of 30° C., and make up the remaining water at the s...

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PUM

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Abstract

The liquid film type microcapsule deep water blocking agent consists of water glass 5-30 wt%, formaldehyde as activator 1-10 wt%, coating agent 0.1-2.0 wt%, aluminum citrate as chelating agent 0.3-5.0 wt%, coagulant aid 0.01-0.14 wt% and water for the rest. It is superior to common water blocking agent, and has long setting time, high setting strength, controllable gel temperature and simple construction process.

Description

technical field [0001] The invention relates to a water shutoff agent and a preparation method thereof, in particular to a liquid film microcapsule deep water shutoff agent used for oil well deep water shutoff and a preparation method thereof. Background technique [0002] In the oil field developed by water flooding, after a stage of exploitation, since the formation is multi-layered and heterogeneous, the injection profile is very uneven as the amount of water injected into the oil layer increases. In some blocks, the water content is very high, while in some blocks, the effect of water injection is not obvious, and in some blocks, the injected water quickly breaks through the high-permeability layer, and the erosion of the high-permeability layer by water increases its permeability, making The heterogeneity of the formation further expands, resulting in a large amount of water from the oil well and a reduction in productivity. In order to make the injected water advance ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/42
Inventor 吴佑实石元昌吕酉珍吴莉莉肖建洪陈辉李萍
Owner SHANDONG UNIV
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