High-elasticity rapid plugging agent and preparation method

Abstract

The invention provides a high-elasticity rapid plugging agent and a preparation method. The high-elasticity rapid plugging agent is composed of a variable framework material and a filling material. The plugging agent is prepared in a base fluid. The plugging agent can deform at a stratum leakage position under wellbore pressure to crack and plug leakage, the formed plugging layer is firm, the plugging success rate can be effectively improved, and repeated leakage is avoided. The plugging material has deformability and can be compressed to deform to enter a deep part of a crack to form a firm plugging layer for plugging, so that repeated leakage can be avoided; the contained base fluid has the characteristic of good dispersion effect, and has a relatively good inhibition effect, so that theinhibition performance can be further improved in the drilling fluid, and collapse of a well wall before and after leaking stoppage is avoided; the framework material has rich open pore structures, and a net rack structure is formed at the cracks, so that a blocking layer is formed.

Description

technical field [0001] The invention relates to a chemical auxiliary material for petroleum drilling, in particular to a plugging agent for drilling fluid loss and a preparation method thereof. Background technique [0002] Lost circulation is the phenomenon that various working fluids leak into the formation under the action of pressure difference during various downhole operations such as drilling, cementing and completion, testing or workover. Once lost circulation occurs, it will not only delay drilling time, lose drilling fluid, damage oil and gas layers, interfere with geological logging work, increase drilling costs, but also easily cause a series of complicated situations such as pipe sticking, blowout, and well collapse, and even lead to the scrapping of the wellbore. cause huge economic losses. At present, the commonly used plugging materials in plugging construction are mostly bridging plugging materials and chemical gel plugging materials. [0003] Chemical plu...

AI Technical Summary

Problems solved by technology

The bridging plugging material has a simple construction process and low cost, and is the most commonly used in the field, but some materials have poor temperature resistance and are prone to decomposition and failure at high temperatures, resulting in repeated leakage of the leaky layer

At the same time, these materials have problems such as sealing the door and not being able to soak for a long time, and the plugging effect is sometimes not ideal