Drilling fluid additive capable of improving oil well cementing quality

A technology of oil well cementing and drilling fluid, which is applied in the direction of drilling composition, chemical instruments and methods, etc., can solve the problems such as difficult to guarantee the quality of cementing, and achieve the effect of promoting tight bonding, enhancing strength and reducing thickness

Inactive Publication Date: 2015-04-15
NORTHEAST GASOLINEEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Theoretically, the slag MTC cementing technology can solidify the drilling fluid and mud cake stored in the well wall. Well quality is also difficult to guarantee

Method used

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  • Drilling fluid additive capable of improving oil well cementing quality
  • Drilling fluid additive capable of improving oil well cementing quality
  • Drilling fluid additive capable of improving oil well cementing quality

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Ingredients according to the following recipe:

[0016] 50% of aluminum silicate whiskers, 20% of nano anatase titanium dioxide, 20% of magnesium-rich silicate mineral fibers, 5% of vinyl acetate, and 5% of sulfonated tannins can be mixed to obtain the petroleum drilling fluid of the present invention Additives, the amount added in the drilling fluid is 1%-3%. The effects of the drilling fluid additive on the cementing interface cementation strength and the main properties of the drilling fluid were investigated, and the results are shown in Table 1 and Table 2.

[0017] The impact of the oil drilling fluid additive of the present invention on the interface bond strength of table 1

[0018]

[0019] The impact of the oil drilling fluid additive of the present invention on the main properties of drilling fluid of table 2

[0020]

Embodiment 2

[0022] Ingredients according to the following recipe:

[0023] Calcium silicate whisker 30%, superfine rutile powder 50%, polyacrylonitrile 10%, polyacrylamide cross-linked body 5%, sulfonated humic acid 5%, after mixing, the petroleum drilling fluid of the present invention can be obtained Additives, the amount added in the drilling fluid is 1%-2%. The effects of the drilling fluid additive on the bonding strength of the cementing interface and the main properties of the drilling fluid were investigated, and the results are shown in Table 3 and Table 4.

[0024] The influence of the oil drilling fluid additive of the present invention on the interface bond strength of table 3

[0025]

[0026] The influence of the petroleum drilling fluid additive of the present invention on the main performance of drilling fluid of table 4

[0027]

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Abstract

The invention discloses a drilling fluid additive capable of improving oil drilling engineering well cementing quality, the drilling fluid additive is a mixture comprising superfine inorganic short fiber, nano superfine crystal, semi rigid fiber, flexible particles, a surface modification agent and other components, according to the mechanism of action, the components comprise 10%-90% by mass of a mud cake curing agent, 5%-70% by mass of an interface affinity agent and 2%-10% by mass of an interface cleaning agent. The interface affinity agent comprises 30%-90% by mass of the nano superfine crystal, 10%-50% by mass of semi rigid fiber and 1%-20% by mass of flexible particles. The drilling fluid additive can enhance the bond strength of cement formation interface, and effectively improves the cementing quality of oil wells. The oil drilling fluid additive is less in addition amount, convenient in construction, and almost free of influence on the main performance of drilling fluid.

Description

technical field [0001] The invention relates to a drilling fluid additive used in petroleum drilling engineering and capable of improving cementing quality. Background technique [0002] In the process of drilling and completion, the quality of completion and cementing directly affects the development efficiency and cost of oil wells. During cementing construction, there is a mud adhesion layer on the first interface and the second interface, and a 1-5 mm thick mud cake will be formed on the well wall of the permeable formation. Since the adhering mud and the formed mud cake have obvious layered structure, they cannot be well cemented with the cement slurry, and the solidification is poor, forming a weak interface for cementing. In the presence of underground active oil, gas and water, these weak interfaces will form channels for oil, gas and water to flow. As time goes on, the cementation of the first interface and the second interface will obviously deteriorate, resulting...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/03
CPCC09K8/03C09K2208/08C09K2208/10
Inventor 王鉴张健伟
Owner NORTHEAST GASOLINEEUM UNIV
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