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Boring flushing fluid and preparation method thereof

A technology of drilling flushing fluid and salt inhibitor, applied in the direction of drilling composition, chemical instruments and methods, etc., can solve the problems of unstable hole wall, inability to prevent dissolution, inability to take out potassium salt core, etc., and achieve improvement The effect of core recovery rate

Active Publication Date: 2013-06-19
QINGHAI QIXIN GEOLOGY & MINERAL EXPLORATION CO LTD
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  • Abstract
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AI Technical Summary

Problems solved by technology

The use of saturated brine flushing fluid cannot prevent the dissolution of magnesium chloride and potassium chloride in the flushing fluid during drilling. On the one hand, due to the rapid dissolution of the core, the complete potassium salt core cannot be taken out (or the potassium salt core cannot be taken out), which seriously affects Coring quality; at the same time, the dissolution of carnallite on the pore wall causes the pore diameter to expand, causing the instability of the pore wall

Method used

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  • Boring flushing fluid and preparation method thereof

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Embodiment Construction

[0018] The present invention will be further described below in conjunction with specific examples, so that those skilled in the art can better understand the present invention and implement it, but the given examples are not intended to limit the present invention.

[0019] The preparation method of the drilling flushing fluid provided by the present invention is as follows: according to parts by weight, take 70-90 parts of magnesium chloride; 1-10 parts of magnesium hydroxide; 1-5 parts of anti-salt tackifier; 1-5 parts of grafted starch; 2~5 parts of agent; 0.5~1 part of coating agent; 3~5 parts of salt inhibitor and 1~3 parts of defoamer, dissolved in 150~180 parts of water in turn.

[0020] The joint effect of magnesium chloride and magnesium hydroxide enables the system to effectively inhibit the dissolution of high solubility salt products such as potassium chloride and magnesium chloride.

[0021] Anti-salt viscosifier, used to improve the suspension capacity of the sy...

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Abstract

The invention discloses a boring flushing fluid containing the following components according to part by weight: 70-90 parts of magnesium chloride, 1-10 parts of magnesium hydroxide, 1-5 parts of slat resistant tackifier, 1-5 parts of grafted starch, 2-5 parts of lubricant, 0.5-1 part of enveloping agent, 3-5 parts of salt inhibitor and 1-3 parts of defoamer. The boring flushing fluid provided inthe invention has strong inhibitive ability, and capable of keeping the bore wall stable if being applied to sylvite ore boring and increasing the percentage of corning of the sylvite ore.

Description

technical field [0001] The invention relates to a drilling flushing fluid used in the field of geological drilling and a preparation method thereof. Background technique [0002] Drilling flushing fluid refers to the circulating flushing medium used in the hole during core drilling. Its main functions are to cool the drill bit, discharge cuttings, and protect the hole wall. At present, the flushing fluid for drilling potassium salt ore body mainly adopts the saturated brine slurry system. Due to the high solubility of potassium chloride, the recovery rate of cores drilled with this system is low. Especially for drilling into carnallite formation, because the main component of carnallite is MgCl 2 .6H 2 O, its solubility is high, and it is greatly changed by temperature. The use of saturated brine flushing fluid cannot prevent the dissolution of magnesium chloride and potassium chloride in the flushing fluid during drilling. On the one hand, due to the rapid dissolution o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/00
Inventor 陶士先王永全纪卫军王玉春崔秀忠胡继良李曦滨付帆李晓东单文军李艳宁
Owner QINGHAI QIXIN GEOLOGY & MINERAL EXPLORATION CO LTD
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