Preparation method of organic titanium cross-linking agent for polyhydroxy alcohol fracturing fluid

Abstract

The invention relates to a preparation method of an organic titanium cross-linking agent for polyhydroxy alcohol fracturing fluid. The preparation method comprises the following steps: adding alkali, sugar, divalent alcohol and tetrabutyl titanate into a reactor, uniformly mixing, raising temperature to 110-150 DEG C, keeping the temperature unchanged, performing reaction for 1-5 hours under continuous stirring, and getting golden yellow liquid which is the organic titanium cross-linking agent for the polyhydroxy alcohol fracturing fluid, wherein the alkali is sodium hydroxide, ethylenediamine, trimethylamine or triethanolamine; the sugar is monosaccharose or disaccharide, the monosaccharose is fructose or glucose, the disaccharide is sucrose, maltose or lactose; the divalent alcohol is ethylene glycol or propylene glycol; the weight ratio of the alkali to the sugar to the divalent alcohol is 0.01-0.2: 0.1-0.4: 1; and the weight ratio of the tetrabutyl titanate to the divalent alcoholis 0.1-0.2: 1. The cross-linking agent has the characteristics of strong sand carrying capability, good temperature resistance, low friction, adjustable delay time, low harm, excellent compatibility with the polyhydroxy alcohol fracturing fluid and the like.

Description

technical field [0001] The invention relates to a preparation method of an organic titanium crosslinking agent for polyhydric alcohol fracturing fluid, which is suitable for use in low-permeability oil and gas layer oil wells or natural gas well fracturing stimulation processes. Background technique [0002] In the prior art, polyhydric alcohol fracturing fluid is a new type of fracturing fluid, in which the molecular weight of the thickener is far lower than that of vegetable gum, and has high surface activity, which can endow the polyhydric alcohol fracturing fluid with gel breaking Thorough, easy flowback, low damage and other advantages, has a good application prospect. The role of the cross-linking agent in the fracturing fluid system is to make the polymer sol into a jelly, thereby greatly increasing the viscosity of the fracturing fluid, meeting the needs of fracturing and sand-carrying, and at the same time, it is the main factor determining the temperature resistanc...

AI Technical Summary

Problems solved by technology

[0003] At present, the commonly used cross-linking agents for fracturing fluids are mainly borax, organic boron, organic titanium, etc., but the cross-linking speed of borax is extremely fast, and the jelly formed by the organic boron / polyhydric alcohol fracturing fluid system is not temperature-resistant, which affects the fracturing fluid. usage of

Although the organic titanium crosslinking agent has the advantages of good temperature resistance, moderate viscosity of crosslinking jelly, low frictional resistance, and adjustable crosslinking speed, etc., it has poor compatibility with polyhydric alcohol fracturing fluid systems, and the delay time is too long. Limiting the popularization and application of organic titanium / polyhydric alcohol fracturing fluid system