Tamponade liquid for well completion and cementation and preparation method thereof

Abstract

The invention relates to the technical field of tamponade liquid for well completion and cementation, in particular to tamponade liquid for well completion and cementation and a preparation method thereof. The tamponade liquid for well completion and cementation is prepared from, by weight, 1.0-3.0 parts of carboxymethylcellulose, 0.5-1.5 parts of sulfonated tannin, 0.5-1.0 part of xanthan gum, 0.2-0.5 part of sodium gluconate, 0.3-0.6 part of tartaric acid and 100 parts of water. The tamponade liquid for well completion and cementation is good in stability at the high temperature of 80 DEG C to 120 DEG C, and has certain viscosity and shearing force, meanwhile, the phenomenon of high-temperature viscosity reduction or high-temperature thickening is avoided in the well cementation coagulating waiting process, an electrical logging cannot meet resistance, and the solid phase suspension need of drilling fluid with barite as main weighting materials on site can be met.

Description

technical field [0001] The invention relates to the technical field of plugging fluid for well cementing and completion, and relates to a plugging fluid for cementing and completion (ie, GJ-100 plugging fluid) and a preparation method thereof. Background technique [0002] With the continuous increase in the number of deep wells and adjustment wells, the wellbore structure of some blocks has also changed, and new treatment agents have been introduced into the drilling fluid system. Obstacles have always been a problem. The main reason for the obstruction of the electrical measuring instrument is that solid particles such as drilling cuttings in the drilling fluid settle and compact on the upper part of the impact rubber plug in the casing of the oil layer or a small amount of cement slurry remaining on the casing wall during well cementing. It will pollute the drilling fluid and cause the viscosity and shear force of the drilling fluid to increase. The currently used plugg...

AI Technical Summary

Problems solved by technology

[0003] The present invention provides a plugging fluid for well cementing and completion and its preparation method, which overcomes the above-mentioned deficiencies in the prior art, and can effectively solve the problems of existing plugging The viscosity of the liquid will decrease or thicken at high temperature, which will easily cause the electrical measuring instrument to be blocked, which can no longer meet the needs of cementing construction.