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Anti-water blocking agent for drilling fluid

A waterproof locking agent and drilling fluid technology, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of shallow release depth, high energy consumption, and low release efficiency, so as to reduce surface tension or interfacial tension, Improve the relative permeability of the gas phase and overcome the effect of water lock damage

Inactive Publication Date: 2013-04-17
东营利丰化工新材料有限公司
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  • Abstract
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AI Technical Summary

Problems solved by technology

However, they all have different disadvantages. The physical method has the disadvantages of high energy consumption and shallow removal depth; while the current chemical method has the disadvantage of low removal efficiency.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0014] The present invention will be further described below in conjunction with the examples.

[0015] AG-6 and FBH-3 were carried out in an orthogonal experiment, and an appropriate amount of inorganic salt was added at the same time. The synergistic effect of the inorganic salt and the main and auxiliary surfactants was used to promote the formation of micelles and further reduce the interfacial tension and surface tension of the solution. Orthogonal design experiments were carried out on AG-6, FBH-3 and inorganic salts to determine the best concentration of the three when the surface tension is the lowest. The results are as follows.

[0016] Orthogonal test factors and levels

[0017] serial number 1 2 3 factor name FBH-3 AG-3 Inorganic salt level 1 0.1% 2% 1% level 2 0.05% 1.5% 0.5% level 3 0.03% 1% 0.25 %

[0018] Orthogonal test table

[0019] List 1 2 3 Surface tension (mN / m) 1 1 1 1 26.5 ...

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PUM

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Abstract

The invention discloses an anti-water blocking agent for drilling fluid. The anti-water blocking agent is formed by mixing the following components: at least one main surfactant capable of reducing surface tension of a solution, at least one auxiliary surfactant capable of improving the drainage assisting capability and minimizing the water saturation of a rock core, inorganic salts, and the balance of water. The anti-water blocking agent disclosed by the invention can be used for greatly reducing the surface tension or interfacial tension of the solution, changing the interface state of a solution system, producing a wetting or anti-wetting effect, improving the relative permeability of a gas phase and enabling the injection process to overcome water blocking damages.

Description

technical field [0001] The invention relates to a treatment agent for oil field exploration, in particular to a waterproof locking agent for drilling fluid. Background technique [0002] At present, my country's low-permeability oilfields are rich in petroleum geological reserves, which are widely developed in various oil-gas-bearing basins in my country. Although low-permeability oilfields have poor geological conditions and are difficult to develop, with the rapid development of my country's economy, the demand for petroleum products is increasing. Larger, richer oil reserves in low-permeability fields are drawing more and more attention. [0003] Low-permeability reservoirs are characterized by high water saturation, high capillary pressure, strong water sensitivity, small pore throats, poor permeability, complex structure, severe heterogeneity, and often accompanied by natural fractures. When the initial water saturation is lower than the bound When the water saturation ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/03
Inventor 奈世杰董建荣孙洪莉宋茹丁解放蒋娟李季李红江杨帆冯兆凯
Owner 东营利丰化工新材料有限公司
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