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Strong-inhibition anticaving drilling fluid and application thereof

A drilling fluid and strong suppression technology, applied in the direction of drilling composition, chemical instruments and methods, etc., can solve problems such as difficult control of rheology, poor thermal stability, and easy hydration of shale formations

Inactive Publication Date: 2015-11-11
北京中科天启油气技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the defects existing in the existing technology, in order to overcome the problems such as wellbore instability easily caused by water-based drilling fluid, easy hydration of shale formation, difficult control of rheology, high filtration loss and poor thermal stability, etc.

Method used

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  • Strong-inhibition anticaving drilling fluid and application thereof
  • Strong-inhibition anticaving drilling fluid and application thereof
  • Strong-inhibition anticaving drilling fluid and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Add 1000 parts of water, 5 parts of soda ash, 5 parts of alkali, and 20 parts of bentonite for drilling fluid into the mud cup at a speed of 500 r / min in parts by weight, and pre-hydrate for 24 hours after dispersing evenly. Add 5 parts of cross-linked starch FLOTROL, 5 parts of xanthan gum, 5 parts of chemical well wall stabilizer ZK-303, 10 parts of plugging agent while drilling, and 10 parts of strong coating inhibitor PLUS into the prehydrated bentonite slurry -L, 5 parts of shale stabilizer HT-201, 5 parts of modified graphite lubricant, fully stir until each reagent is evenly dispersed, then add another, and adjust the pH to 9 with saturated sodium carbonate solution.

Embodiment 2

[0036] Add 1,000 parts of water, 10 parts of soda ash, 10 parts of alkali, and 30 parts of bentonite for drilling fluid into the mud cup at a speed of 500 r / min in parts by weight. After uniform dispersion, pre-hydrate for 24 hours. Add 10 parts of high temperature resistant starch FLO-HT, 10 parts of xanthan gum, 10 parts of potassium chloride, 10 parts of nanoemulsion blocking agent, 10 parts of strong coating inhibitor PLUS-L, 5 parts of shale stabilizer HT-201, 5 parts of liquid lubricant RH-2, fully stir until each reagent is evenly dispersed, then add the other, and adjust the pH to 9 with potassium hydroxide saturated solution.

Embodiment 3

[0038] Add 1,000 parts of water, 10 parts of soda ash, 10 parts of alkali, and 30 parts of bentonite for drilling fluid into the mud cup at a speed of 500 r / min in parts by weight. After uniform dispersion, pre-hydrate for 24 hours. Add 10 parts of sulfonated phenolic resin SMP-1, 10 parts of high-viscosity carboxymethyl cellulose, 10 parts of potassium chloride, 10 parts of non-fluorescence anti-slump plugging agent EP, 10 parts of strong Coating inhibitor PLUS-L, 5 parts of polymer alcohol, 12 parts of liquid lubricant RH-2. Stir well until each reagent is evenly dispersed before adding another, continue to add 40 parts of sodium chloride, adjust the pH to 10 with a saturated solution of sodium carbonate, and use a density of 4.0g / cm 3 The barite is aggravated to a drilling fluid density of 1.20g / cm 3 .

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Abstract

The invention discloses a strong-inhibition anticaving drilling fluid and application thereof. The strong-inhibition anticaving drilling fluid consists of 1000 parts of water, 20 to 60 parts of bentonite for drilling fluid, 5 to 20 parts of sodium carbonate, 5 to 20 parts of alkali, 10 to 20 parts of coating agent, 5 to 20 parts of flow pattern regulator, 5 to 20 parts of shale inhibitor, 10 to 30 parts of borehole stabilizer, 10 to 30 parts of plugging agent, 5 to 30 parts of lubricating agent, 5 to 40 parts of filtrate reducer, 1 to 10 parts of pH regulator, and a proper amount of salts and barite added according to the requirement. The strong-inhibition anticaving drilling fluid has the remarkable characteristics of properties of stabilizing a borehole, protecting an oil layer, improving the drilling speed, and preventing a balled bit and the like from approaching to oil-based drilling fluid.

Description

technical field [0001] The invention belongs to the technical field of oilfield drilling fluid systems, and in particular relates to a strongly suppressed and anti-slump drilling fluid and its application. Background technique [0002] After the end of the 20th century, with the increasingly stringent requirements for environmental protection, the use of oil-based drilling fluids was restricted. In order to solve the problems of wellbore instability during drilling, control the rheology of drilling fluid, and improve the thermal stability of drilling fluid. Countries around the world have begun to study strong inhibition water-based drilling fluids. [0003] At present, KCl / silicate polymer drilling fluid is more maturely used. It is also the earliest successful application of inhibitory water-based drilling fluid. Its main treatment agents are shale inhibitors, fluid loss reducers and rheology modifiers. But the application of KCl / silicate polymer drilling fluid has its l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/24
CPCC09K8/24
Inventor 孙保明李兴发张彪
Owner 北京中科天启油气技术有限公司
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