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Drilling fluid, preparation method and application thereof

A drilling fluid and inhibitor technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of deepening reservoir damage, long drilling cycle, long soaking time, etc., to control wellbore collapse, reduce Damage, Intrusion Reduction Effect

Inactive Publication Date: 2016-08-10
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a drilling fluid, which solves the problem of slow drilling speed, long drilling cycle, poor fluidity, and long soaking time of the well wall in the drilling fluid caused by increasing the density of the drilling fluid in the prior art to protect the reservoir. Technical problems such as deeper damage to the reservoir

Method used

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  • Drilling fluid, preparation method and application thereof
  • Drilling fluid, preparation method and application thereof
  • Drilling fluid, preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0036] In the present embodiment, the composition of the drilling fluid and the percentage by weight of each component are as follows:

[0037] 1% plugging agent G314-FDJ;

[0038] 7% inorganic salt inhibitor KCl;

[0039] 0.35% organic salt inhibitor G319-FTJ;

[0040] 1% acid soluble fluid loss reducer G310-SJS;

[0041] 2.5% acid-soluble temporary plugging agent G302-SZD;

[0042] 0.3% xanthan gum;

[0043] 0.3% high viscosity polyanionic cellulose;

[0044] 0.3% low viscosity polyanionic cellulose;

[0045] The rest is water and an appropriate amount of NaCl;

[0046] Concrete preparation process is as follows:

[0047] According to the weight percentage of the above components, first add high-viscosity polyanionic cellulose, low-viscosity polyanionic cellulose, and xanthan gum into the water, and fully stir, and the stirring reaction is controlled for 40 to 60 minutes until it is completely dissolved;

[0048] Then add acid-soluble dehydration reducer G310-SJS and...

Embodiment 2

[0060]In the present embodiment, the composition of the drilling fluid and the percentage by weight of each component are as follows:

[0061] 1.2% plugging agent G314-FDJ;

[0062] 8% inorganic salt inhibitor KCl;

[0063] 0.4% organic salt inhibitor G319-FTJ;

[0064] 1.2% acid soluble fluid loss reducer G310-SJS;

[0065] 3.0% acid-soluble temporary plugging agent G302-SZD;

[0066] 0.4% xanthan gum;

[0067] 0.4% high viscosity polyanionic cellulose;

[0068] 0.4% low viscosity polyanionic cellulose;

[0069] The rest is water and an appropriate amount of NaCl;

[0070] Concrete preparation process is as follows:

[0071] According to the weight percentage of the above components, first add high-viscosity polyanionic cellulose, low-viscosity polyanionic cellulose, and xanthan gum into the water, and fully stir, and the stirring reaction is controlled for 40 to 60 minutes until it is completely dissolved;

[0072] Then add acid-soluble dehydration reducer G310-SJS a...

Embodiment 3

[0083] In the present embodiment, the composition of the drilling fluid and the percentage by weight of each component are as follows:

[0084] 1.5% plugging agent G314-FDJ;

[0085] 9% inorganic salt inhibitor KCl;

[0086] 0.45% organic salt inhibitor G319-FTJ;

[0087] 1.5% acid soluble fluid loss reducer G310-SJS;

[0088] 4.0% acid-soluble temporary plugging agent G302-SZD;

[0089] 0.5% xanthan gum;

[0090] 0.5% high viscosity polyanionic cellulose;

[0091] 0.5% low viscosity polyanionic cellulose;

[0092] The rest is water and an appropriate amount of NaCl;

[0093] Concrete preparation process is as follows:

[0094] According to the weight percentage of the above components, first add high-viscosity polyanionic cellulose, low-viscosity polyanionic cellulose, and xanthan gum into the water, and fully stir, and the stirring reaction is controlled for 40 to 60 minutes until it is completely dissolved;

[0095] Then add acid-soluble dehydration reducer G310-SJS...

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Abstract

The invention provides a drilling fluid, a preparation method and an application thereof. The drilling fluid includes, by mass, 1-1.5% of a plugging agent, 7-9% of an inorganic salt inhibitor, 0.35-0.45% of an organic salt inhibitor, 1-1.5% of an acid dissolution fluid loss agent, 2.5-4.5% of an acid dissolution temporary plugging agent, 0.3-0.5% of xanthan gum, 0.3-0.6% of high-viscosity polyanionic cellulose, 0.3-0.6% of low-viscosity polyanionic cellulose, and the balanced being water. The drilling fluid solves the technical problems of low drilling speed, long drilling period, poor flowability, long soaking time of well wall in the drilling fluid and high reservoir damage degree since the reservoir is protected by increasing the density of the drilling fluid in the prior art.

Description

technical field [0001] The invention relates to the technical field of oilfield additives, in particular to a drilling fluid for plugging formation micro-fractures and a preparation method and application thereof. Background technique [0002] Horizontal well drilling technology has been widely used in the drilling and production of oil and gas wells. At present, in the horizontal wells drilled in the east of Sulige, the average length of the horizontal section exceeds 1,000 meters. The stone box encountered by the horizontal well is the main collapsed layer. There is a large amount of mud shale in the reservoir, and the average cation exchange capacity is 14.0mmol / 100g. Therefore, in the process of drilling horizontal wells, not only the protection of the reservoir, but also the prevention of collapse should be paid attention to. [0003] At present, in the case of frequently encountering large sections of mudstone during the drilling of horizontal wells, in order to ensure...

Claims

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Application Information

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IPC IPC(8): C09K8/10C09K8/12C09K8/514
Inventor 赵巍李波吴学升欧阳勇高云文王勇茗黄占盈张燕娜周文军王彦博
Owner PETROCHINA CO LTD
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