Intelligent elastic casing pipe protecting sleeve and design method thereof

Abstract

The invention discloses an intelligent elastic casing pipe protecting sleeve and a design method thereof. The intelligent elastic casing pipe protecting sleeve comprises two layers of airtight wrapping layers arranged around the outer side of a casing pipe, wherein an intelligent elastic layer is arranged between the wrapping layers; the interior of the intelligent elastic layer is supported and divided through a main body framework; a mixed solution is wrapped in the main body framework and is the mixed solution of a nano-porous material and a liquid; the liquid is a non-wetting liquid (such as water or glycerinum); and the nano-porous material is a hydrophobic porous material. The intelligent elastic casing pipe protecting sleeve sleeves the outer wall of the casing pipe, when an environment pressure is changed, the intelligent elastic casing pipe protecting sleeve intelligently adjusts own volume and shape and plays a role in balancing the pressure of the outer wall of the casing pipe and sealing a small slot between the casing pipe and a cement stone ring, and the intelligent elastic layer plays a main role in distributing pressure in a pressure changing process; and when the pressure and the temperature are changed, the intelligent elastic layer automatically adjusts shape, re-distributes the pressure, and shows very excellent temperature change resistance and pressure change resistance. The intelligent elastic casing pipe protecting sleeve has the characteristics of simple structure, convenience and practicability.

Description

technical field [0001] The invention relates to the technical field of petroleum casing, in particular to an intelligent elastic casing protective cover and a design method thereof. Background technique [0002] Oil casing is a steel pipe used to support the walls of oil and gas wells, and it is the lifeline to ensure the normal operation of the entire oil well during the drilling process and after completion. However, defects in the cement sheath, eccentricity or poor cementation will affect the bearing capacity of the casing. For mudstone and salt rock formations with low strength and high rheology, after the mudstone absorbs water and softens, the non-uniform load of the formation is more likely to affect the casing safety. Domestically, casing collapses in rock salt formations have occurred in Zhongyuan Oilfield, Jianghan Oilfield, Shengli Oilfield, Huabei Oilfield, Sichuan Oilfield and Tarim Oilfield, causing huge economic losses. [0003] In drilling engineering, the...

AI Technical Summary

Problems solved by technology

Once gas channeling occurs, even if a lot of manpower and material resources are spent, it is difficult to restore the original interlayer sealing state

Images