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Biology modified silicate drilling fluid system

A biological modification and silicate technology, applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of shale collapse, wellbore pressure imbalance, etc., and achieve good environmental protection performance and good compatibility. Effect

Active Publication Date: 2011-05-04
北京奥凯立科技发展股份有限公司
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AI Technical Summary

Problems solved by technology

Therefore, ordinary water-based mud cannot form mud cakes on mud shale formations, so that water diffuses into the rocks. At this time, the pore pressure around the well wall will gradually increase with time, which will lead to the imbalance of well wall pressure and cause mud pages. rock collapse

Method used

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  • Biology modified silicate drilling fluid system
  • Biology modified silicate drilling fluid system
  • Biology modified silicate drilling fluid system

Examples

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Embodiment Construction

[0027] Put 20m3 of fresh water in the circulation pool, mix it well and make it into a pre-hydrated soil slurry. The hydration time of the pre-hydrated slurry should not be less than 6 hours. Add 30kg xanthan gum, 150kg low-viscosity polyanionic cellulose, 900kg sulfonated phenolic resin, 1500kg methyl glucoside, 600kg non-permeation treatment agent, 600kg / m3 hydroxyl film-forming agent, 600g low-fluorescence asphalt , 600kg of extreme pressure lubricant, 900kg of sodium silicate, 900kg of potassium chloride, add fresh water to 30m3, and stir well to form the drilling fluid system described in this article.

[0028] Present embodiment also can use seawater, if be seawater, should add 450kg caustic soda earlier, the soda ash of 300kg, react not less than 30 minutes after adding alkali. Then add components such as bentonite, specifically the same process as the above-mentioned method using fresh water.

[0029] Performance experiment data of prepared water-based bio-modified si...

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Abstract

The invention relates to an environment-friendly and anti-sloughing water-based bio-modified silicate drilling fluid system, which consists of freshwater or seawater slurry, xanthan gum, low viscosity polyanionic cellulose, sulfonated phenolic resin, methylglucoside, non-permeation treatment agent, hydroxy film forming agent, low fluorescence asphalt, extreme pressure lubricator, sodium silicate,potassium chloride and fresh water or sea water. The drilling fluid system of the invention is an environment-friendly anti-sloughing water-based bio-modified silicate drilling fluid system, the comprehensive properties of which can be compared with that of oil-based drilling fluid, but the plugging capacity is greatly better than that of oil-based drilling fluid.

Description

technical field [0001] The invention relates to an environment-friendly and anti-collapse water-based biologically modified silicate drilling fluid system. Background technique [0002] In recent years, foreign scholars have proposed and developed an ultra-low permeability drilling fluid system. Its main working principle is: using special polymers concentrated on the rock surface of the borehole wall to form micelles or colloidal interfacial suction and its deformability, to block a large range of pore throats on the rock surface of the borehole wall, forming a compact ultra-low The permeable sealing layer effectively seals formations with different permeability and micro-fractured shale formations, and forms a protective layer around the wellbore wall to completely isolate the drilling fluid and its filtrate from penetrating into the formation, achieving zero fluid loss drilling . [0003] For mud shale formations with extremely complex geological structures, many faults...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/18
Inventor 罗向东孔德强
Owner 北京奥凯立科技发展股份有限公司
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