Broad-spectrum deformable while-drilling leak-proof sealing agent

Abstract

The invention relates to a broad-spectrum deformable while-drilling leak-proof sealing agent which comprises the following components in percentage by weight: 40-60% of amorphous plugging material, 15-25% of ultrafine expanding material, 5-10% of elastic tire rubber particle and 20-35% of reinforcer ultrafine calcium carbonate powder. The amorphous plugging material is amorphous slag powder, and the ultrafine expanding material is ultrafine konjaku powder, ultrafine bamboo powder or ultrafine natural rubber powder. The sealing agent has the advantages of high sealing efficiency and high acid solubility, is independent of leak layer pores and crack size, and can be used for while-drilling leak-proof sealing for permeable and cracking non-reservoirs and reservoirs.

Description

technical field [0001] The invention relates to an anti-leakage and plugging agent for petroleum drilling engineering, in particular to a broad-spectrum deformable anti-leakage and plugging agent while drilling. Background technique [0002] Lost circulation is one of the ubiquitous technical problems in the drilling process. The occurrence of lost circulation will lose a large amount of drilling fluid materials, consume drilling time, and may cause a series of complex accidents such as pipe sticking, blowout, and well collapse, resulting in major economic losses. . The more effective way to solve lost circulation is to add a plugging agent to the drilling fluid for plugging while drilling or use a plugging agent to prepare a plugging fluid to effectively plug the lost zone. The latter method needs to be carried out after entering the lost zone. Drilling is stopped, which prolongs the operation time and increases the drilling cost. [0003] At present, the most widely used...

AI Technical Summary

Problems solved by technology

[0003] At present, the most widely used anti-leakage and plugging agents while drilling are all bridge-type anti-leakage and plugging materials. Strong dependence, if the particle size of the plugging agent does not match the pore throat diameter of the lost formation unreasonably, it will not have an effective plugging effect, and only a simple sealing door will be formed outside the wellbore wall

This type of anti-leakage and plugging agent while drilling has a narrow plugging range and poor adaptability for leak prevention and plugging

[0004] At the same time, although various types of anti-leakage and plugging agents while drilling have achieved good application effects to a certain extent, they also have great influence on the rheological properties of drilling fluid, weak plugging ability for micro-fracture formations, and poor acid solubility. And other issues

Most anti-leakage and plugging materials while drilling have low acid solubility, which has potential damage to the reservoir, which is not conducive to reservoir protection, and the plugging compressive strength is not high, and may be leaked again due to high pressure difference during drilling, so it is not suitable for Lost zone

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