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Drilling fluid filtrate reducer and preparation method thereof

A technology of fluid loss reducer and drilling fluid, which is applied in the field of petroleum drilling fluid, can solve the problems of insufficient compactness of filter cake, insufficient plugging capacity of rock micropores and micro-fractures, and increased risk of shale well wall collapse, etc., to achieve improved Tightness, improve wellbore stability, and improve the effect of fluid loss reduction

Inactive Publication Date: 2017-05-10
中石化石油工程技术服务有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the shortcomings or deficiencies of these technologies are: the formed filter cake is not dense enough, and the ability to seal the micropores and micro-cracks of the rock is not enough, resulting in the fact that water still has a certain degree of impact on the mud shale when drilling in a long mud shale well section. Intrusion on the shale, which increases the risk of shale well wall collapse

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The fluid loss control agent used in this embodiment comprises the following components in 100 parts by weight:

[0022] 70 parts by weight of heavy liquid paraffin;

[0023] Span80 10 parts by weight;

[0024] 20 parts by weight of nano silicon dioxide and nano calcium carbonate aqueous dispersion.

[0025] The preparation method that present embodiment uses described nano silicon dioxide and nano calcium carbonate water dispersion liquid comprises:

[0026] Add nano-silica and nano-calcium carbonate to deionized water at a weight ratio of 2:1, then add sodium hexametaphosphate, and stir at a high speed for 30 minutes at 25°C to obtain an aqueous dispersion of nano-silica and nano-calcium carbonate.

[0027] The method for preparing the fluid loss control agent described in this embodiment includes:

[0028] Mix Span80 and heavy liquid paraffin at a weight ratio of 7:1, stir at 25°C with a magnetic stirrer at high speed for 10 min, then gradually add nano-silica and...

Embodiment 2

[0030] The fluid loss control agent used in this embodiment comprises the following components in 100 parts by weight:

[0031] 50 parts by weight of white oil;

[0032] Tween20 20 parts by weight;

[0033] 30 parts by weight of nano silicon dioxide and nano calcium carbonate aqueous dispersion.

[0034] The preparation method that present embodiment uses described nano silicon dioxide and nano calcium carbonate water dispersion liquid comprises:

[0035] Add nano-silica and nano-calcium carbonate into deionized water at a weight ratio of 3:2, then add sodium polyacrylate, and stir at 30°C for 60 minutes at high speed to obtain an aqueous dispersion of nano-silica and nano-calcium carbonate.

[0036] The method for preparing the fluid loss control agent described in this embodiment includes:

[0037] Mix Tween20 and white oil in a weight ratio of 5:2, stir at 30°C with a magnetic stirrer for 30 minutes at high speed, then gradually add nano-silica and nano-calcium carbonate...

Embodiment 3

[0039] The fluid loss control agent used in this embodiment comprises the following components in 100 parts by weight:

[0040] 60 parts by weight of heavy liquid paraffin;

[0041] 20 parts by weight of the mixture of Span80 and PVA;

[0042] 20 parts by weight of nano silicon dioxide and nano calcium carbonate aqueous dispersion.

[0043] The preparation method that present embodiment uses described nano silicon dioxide and nano calcium carbonate water dispersion liquid comprises:

[0044] Add nano-silica and nano-calcium carbonate into deionized water at a weight ratio of 1:1, then add a mixture of polyethylene glycol and sodium hexametaphosphate (mixing ratio 1:3), and stir at 40°C for 50 minutes at high speed to obtain Nano silicon dioxide and nano calcium carbonate aqueous dispersion.

[0045] The method for preparing the fluid loss control agent described in this embodiment includes:

[0046] Mix the mixture of Span80 and PVA (mixing ratio 4:1) with heavy liquid par...

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Abstract

The present invention provides a drilling fluid filtrate reducer, which contains, by weight, 30-70 parts of an oil phase, 10-30 parts of a nonionic surfactant, and 20-50 parts of a nanometer silica and nanometer calcium carbonate water dispersion. The invention further provides a preparation method of the drilling fluid filtrate reducer, wherein the preparation method comprises: mixing a nonionic surfactant and an oil phase according to a certain ratio, carrying out high speed stirring for 10-30 min at a temperature of 20-40 DEG C with a magnetic stirrer, gradually adding a nanometer silica and nanometer calcium carbonate water dispersion under low speed stirring, and carrying out high speed stirring for 10-30 min to obtain the drilling fluid filtrate reducer. According to the present invention, the pore and the micro-crack are blocked by using the nanoparticles, the formed filter cake is relatively compact, the quality of the filter cake can be improved, the filtrate reducing of the drilling fluid can be reduced, the stability of the borehole wall can be improved, and the good oil and gas layer protection effect is provided.

Description

technical field [0001] The invention relates to the technical field of petroleum drilling fluids, in particular to a fluid loss reducer for drilling fluids for reducing the fluid loss of drilling fluids and a preparation method thereof. Background technique [0002] Fluid loss reducer is an important mud treatment agent used to stabilize the performance of drilling fluid, reduce the loss of harmful liquid to the formation, stabilize the borehole wall and ensure the regular borehole diameter. Fluid loss reducer is the most important admixture in oil well cement. It is usually necessary to add fluid loss reducer to control liquid phase fluid loss in cement slurry when cementing technical casing, reservoir casing and liner. It plays an important role in wellbore stability and protection of oil and gas layers. [0003] At present, a lot of efforts have been made in the research of drilling fluid plugging agents and fluid loss control agents at home and abroad, and many treatmen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/03C09K8/22
CPCC09K8/03C09K8/22
Inventor 刘振东李公让乔军侯业贵周守菊卜凡康张守文
Owner 中石化石油工程技术服务有限公司
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