Leakage-stopping agent with sustainable expansibility

Abstract

The invention discloses a leakage-stopping agent with sustainable expansibility. The leakage-stopping agent with sustainable expansibility comprises 50 to 70 wt% of a bridging agent, 10 to 20 wt% of a packing agent, 1 to 5 wt% of fibrous material and 10 to 15 wt% of delayed-expansion gel material, wherein the bridging agent is a mixture of vermiculite, rice hull and nut shell according to any ratio; the packing agent is a mica sheet; the fibrous material is a plant straw; the delayed-expansion gel material is a polyacrylamide gel particle. The leakage-stopping agent has certain deformability and strength, has sustainable expansibility within a certain time, can improve the leakage-stopping effect and the loading capacity of stratum, can reduce the loss of lost circulation and can improve the comprehensive efficiency of well drilling.

Description

technical field [0001] The invention relates to the field of oil and gas exploration, in particular to a sustainable expansion plugging agent. Background technique [0002] Lost circulation is one of the downhole complex situations that seriously affect the normal drilling and production, and it brings the following hazards to oil and gas exploration, drilling and development operations: 1) Delayed drilling operation time and extended drilling cycle; 2) Large material 3) Reservoir leakage will reduce productivity; 4) Interfere with geological logging work; 5) Interfere with normal maintenance and treatment of drilling fluid performance; 6) Cause downhole complications. Lost circulation during the drilling process will lead to a drop in the liquid level in the well, a decrease in the pressure of the drilling fluid column, and may even lead to blowout or stuck pipe, which will cause huge economic losses. [0003] There are many kinds of plugging materials at home and abroad, ...

AI Technical Summary

Problems solved by technology

[0002] Lost circulation is one of the downhole complex situations that seriously affect the normal drilling and production, and it brings the following hazards to oil and gas exploration, drilling and development operations: 1) Delayed drilling operation time and extended drilling cycle; 2) Large material 3) Reservoir leakage will reduce productivity; 4) Interfere with geological logging work; 5) Interfere with normal maintenance and treatment of drilling fluid performance; 6) Cause downhole complications

Lost circulation during the drilling process will lead to a drop in the liquid level in the well, a decrease in the pressure of the drilling fluid column, and may even lead to blowout or stuck pipe, which will cause huge economic losses

[0003] There are many kinds of plugging materials at home and abroad, mainly including bridging plugging materials, high water loss plugging materials, temporary plugging materials, chemical plugging materials, inorganic gel plugging materials and soft (hard) rubber plugging materials, etc. These lost circulation agents mainly have the following defects in drilling and plugging: first, the plugging material itself is relatively rigid, and particles that do not match the shape of the pores and fractures of the leaking layer are difficult to enter the leaking layer, and will only accumulate on the surface of the leaking layer; Second, the plugging material does not have expansion or expansion is small, and it is not easy to stay in the leaking layer stably under the action of external force

Therefore, the plugging effect of the above plugging materials is not good during use or repeated leakage will occur after plugging