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Anti-collapse and anti-leakage drilling washing fluid used during drilling and field production method thereof

A drilling flushing fluid and anti-slump technology, which is applied in the field of geological core drilling, can solve the problems of difficulty in exerting the anti-collapse ability of the upper carbonaceous slate layer, high costs of flushing fluid and plugging, and low drilling efficiency, and can adapt to the width of cracks. Wide range, fast plugging speed, and the effect of improving drilling efficiency

Active Publication Date: 2015-09-09
INST OF EXPLORATION TECH OF CHINESE ACAD OF GEOLOGICAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, during drilling, in order to ensure the stability of the hole wall in the carbonaceous slate layer, it is necessary to prepare a strong anti-collapse drilling flushing fluid. Due to leakage, it is difficult to exert the anti-collapse ability to the upper carbonaceous slate layer. Therefore, drilling accidents frequently occur in such formation conditions, drilling efficiency is low, and the cost of flushing fluid and plugging is high

Method used

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  • Anti-collapse and anti-leakage drilling washing fluid used during drilling and field production method thereof
  • Anti-collapse and anti-leakage drilling washing fluid used during drilling and field production method thereof
  • Anti-collapse and anti-leakage drilling washing fluid used during drilling and field production method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Indoor test: Add 30g of bentonite and 2g of soda ash to 1000ml of clear water, stir at 11000r / min for 10min and then let it stand for 24h as the base slurry; Type regulator 15g, bridging agent 30g, plugging agent 50g, inhibitor 10g, foaming agent 3mL, after adding each agent, add the next agent after stirring evenly, and finally stir evenly to get the described MWD. Slump leak-proof borehole flushing fluid.

Embodiment 2

[0042] Indoor test: Add 50g of bentonite and 4g of soda ash to 1000ml of clear water, stir at 11000r / min for 10min and then let it stand for 24h as the base slurry; Type regulator 5g, bridging agent 80g, plugging agent 20g, inhibitor 30g, foaming agent 1mL, every time adding a dose, add the next dose after stirring evenly, and finally stir evenly to obtain the described anti-corrosion agent while drilling. Slump leak-proof borehole flushing fluid.

Embodiment 3

[0044] Indoor test: Add 40g of bentonite and 3g of soda ash to 1000ml of clear water, stir at 11000r / min for 10min and then let it stand for 24h as the base slurry; Type regulator 10g, bridging agent 50g, plugging agent 40g, inhibitor 20g, foaming agent 2mL, every time adding a dose, add the next dose after stirring evenly, and finally stir evenly to get the described anti-drilling agent. Slump leak-proof borehole flushing fluid.

[0045] Indoor performance test: mainly carry out various indoor performance tests on the anti-slump and anti-leakage drilling flushing fluid prepared in the aforementioned three embodiments. Among them, the non-dispersible low-solid phase mud mentioned in the following comparison test is a mud system commonly used in geological drilling, and its formula is, by mass fraction: 4% bentonite + 0.2% soda ash + 0.3% high viscosity sodium carboxymethyl cellulose +75ppm hydrolyzed polyacrylamide.

[0046] ①Basic performance test: It mainly includes perfor...

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Abstract

The invention discloses an anti-collapse and anti-leakage drilling washing fluid used during drilling and a field production method thereof, belongs to the technical field of geological core drilling technology, and aims to solve the problem that drilling washing fluid is poor in wall protecting effect under the stratum conditions of strong breaking and continuous leakage. The drilling washing fluid is characterized in that 30-50kg of bentonite, 2-4kg of soda ash, 2-5kg of tackifier, 20-50kg of fluid loss agent, 5-15kg of flow pattern regulator, 30-80kg of bridging agent, 20-50kg of blocking agent, 10-30kg of inhibitor and 1-3L of foaming agent are added to each cubic meter of water. The anti-collapse and anti-leakage drilling washing fluid has the advantages that the drilling washing fluid is good in collapse preventing effect, fast in leakage blocking, high in leakage blocking strength, wide in adaptive crack width range, and widely applicable to the drilling of water-sensitive and loose and broken stratums, low-pressure leakage layers and fracture hole developed stratums.

Description

technical field [0001] The invention relates to the technical field of geological core drilling, in particular to a drilling flushing fluid for preventing collapse and leakage while drilling and an on-site preparation method thereof. Background technique [0002] Drilling flushing fluid is commonly known as the "blood" in drilling engineering, and its importance is self-evident. Among them, an important function of the flushing fluid during the drilling process is to maintain the stability of the hole wall. However, since the geological core drilling objects are usually important metallogenic belts, the geological structure is relatively complex, and it is prone to stratum fragmentation, fracture development, abnormal formation pressure, etc. Disadvantages. Therefore, during drilling, the hole wall instability often occurs because the performance of the flushing fluid is difficult to meet the requirements, which in turn leads to serious accidents such as drill sticking and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/52C09K8/514
CPCC09K8/514C09K8/52C09K2208/02C09K2208/08C09K2208/18
Inventor 张统得吴金生李前贵刘卫东
Owner INST OF EXPLORATION TECH OF CHINESE ACAD OF GEOLOGICAL SCI
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