A drilling fluid with chemical reverse osmosis function

A technology of reverse osmosis and drilling fluid, which is applied in the field of water-based drilling fluid and drilling fluid for oil drilling, and can solve problems such as rock instability and collapse on the well wall

Active Publication Date: 2015-08-12
HUBEI HANC NEW TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, according to domestic and foreign studies, the semi-permeable membrane of natural mud shale is a non-ideal membrane. The leakage phenomenon of this non-ideal membrane makes the solvent medium unable to completely prevent water from permeating the membrane, which will still lead to instability of the well wall rock. Collapse accident

Method used

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  • A drilling fluid with chemical reverse osmosis function
  • A drilling fluid with chemical reverse osmosis function
  • A drilling fluid with chemical reverse osmosis function

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] A drilling fluid with chemical reverse osmosis function includes the following components in mass percentage:

[0047] 2.0 parts of bentonite;

[0048] 0.2 parts of sodium hydroxide;

[0049] 0.5 part of polyanionic cellulose;

[0050] 3.0 parts of temperature-resistant and salt-resistant fluid loss reducer, made by mixing sulfonated phenolic resin, lignite resin, and potassium humate at room temperature. The ratio of sulfonated phenolic resin: lignite resin: potassium humate is 2:1:3.

[0051] 1.0 parts of nano-micron emulsified plugging agent, prepared by mixing emulsified paraffin wax, styrene-butadiene latex, and acrylate emulsion at a temperature of 80°C and stirring at a high speed of 10,000 rpm for 20 minutes; emulsified paraffin wax: styrene-butadiene latex: acrylate The ratio of the emulsion is 3:2:5.

[0052] 1.0 parts of nano-blocking agent, prepared by mixing nano-calcium carbonate, nano-silica, and nano-montmorillonite at normal temperature, the ratio of...

Embodiment 2

[0059] A drilling fluid with chemical reverse osmosis function includes the following components in mass percentage:

[0060] 2.0 parts of bentonite;

[0061] 0.2 parts of sodium hydroxide;

[0062] 0.5 part of polyanionic cellulose;

[0063] 1.0 parts of temperature-resistant and salt-resistant fluid loss reducer, which is prepared by mixing sulfonated phenolic resin, lignite resin, and potassium humate at room temperature. The ratio of sulfonated phenolic resin: lignite resin: potassium humate is 2.5: 1.5: 4.

[0064] 2.0 parts of nano-micron emulsified plugging agent, prepared by mixing emulsified paraffin wax, styrene-butadiene latex, and acrylate emulsion at a temperature of 80°C and stirring at a high speed of 10,000 rpm for 20 minutes; emulsified paraffin wax: styrene-butadiene latex: acrylate The ratio of the emulsion is 4:3:6.

[0065] 1.0 parts of nano-blocking agent, prepared by mixing nano-calcium carbonate, nano-silica, and nano-montmorillonite at room temperat...

Embodiment 3

[0072] A drilling fluid with chemical reverse osmosis function includes the following components in mass percentage:

[0073] 2.0 parts of bentonite;

[0074] 0.2 parts of sodium hydroxide;

[0075] 0.5 part of polyanionic cellulose;

[0076] 3.0 parts of temperature-resistant and salt-resistant fluid loss reducer, made by mixing sulfonated phenolic resin, lignite resin, and potassium humate at room temperature. The ratio of sulfonated phenolic resin: lignite resin: potassium humate is 3:2:5.

[0077] 3.0 parts of nano-micron emulsified plugging agent, prepared by mixing emulsified paraffin wax, styrene-butadiene latex, and acrylate emulsion at a temperature of 80°C and stirring at a high speed of 10,000 rpm for 20 minutes; emulsified paraffin wax: styrene-butadiene latex: acrylate The ratio of the emulsion is 5:4:7.

[0078] 2.0 parts of nano-blocking agent, prepared by mixing nano-calcium carbonate, nano-silica, and nano-montmorillonite at room temperature, the ratio of n...

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Abstract

The invention relates to a drilling fluid with a chemical reverse osmosis function and belongs to the technical field of water-based drilling fluids for petroleum drilling. The drilling fluid is prepared from raw materials such as a nano-microemulsion blocking agent, a nano blocking agent and a reverse osmosis agent. The drilling fluid can be formed into a semipermeable membrane with high membrane efficiency on the wall of a shale well under the action of the nano-microemulsion blocking agent and the nano blocking agent; the reverse osmosis agent is used for keeping the water activity of the drilling fluid less than or equal to the water activity of stratum shale, so that reverse chemosmosis differential pressure can be generated between the drilling fluid and the wall of the shale well; consequently, water in the drilling fluid is prevented from penetrating and migrating into the shale stratum and the purpose of stabilizing the wall of the well is achieved. Besides, the drilling fluid provided by the invention is used for solving the problems that in the prior art, only the blocking capacity is paid attention to and the chemosmosis driving force of water migration of the drilling fluid and the shale is neglected, and as a physical blocking method is adopted, the semipermeable membrane has seepage phenomenon so that a solvent medium is incapable of completely preventing water from penetrating through the membrane, and as a result, collapse accidents caused by unstable rock on the wall of the well still occur.

Description

technical field [0001] The invention relates to a drilling fluid with chemical reverse osmosis function, which belongs to the technical field of water-based drilling fluid for petroleum drilling. Background technique [0002] It is well known that the entry of water into the mud shale formation near the borehole wall is one of the main reasons for the instability of the borehole wall. On the other hand, the strength reduction of shale rocks after absorbing water will generate expansion pressure, which will cause changes in mechanical properties, which is not conducive to the stability of the wellbore wall, resulting in the instability and collapse of the wellbore rocks. Therefore, when drilling with water-based drilling fluid, all technical measures must be taken to prevent water from entering the formation. Generally, the driving forces for water entering the formation mainly include: static pressure and dynamic pressure difference, osmotic pressure difference and capillar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/24C09K8/42
Inventor 王荐向兴金舒福昌吴彬周文涛蒋卓
Owner HUBEI HANC NEW TECH
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