Preparation method of filtration control lubricant used by high-temperature horizontal well and directional well

Abstract

The invention relates to a preparation method of a filtration control lubricant used by a high-temperature horizontal well and directional well. In a reaction container, a glycan drilling fluid treatment agent is mixed with water, and then sodium benzoate and hexamethylenetetramine or paraformaldehyde are added; then a plant polyphenol material and lignosulfonate are added into a mixture in the reaction container; finally, a mixture in the reaction container is subjected to vacuum drying and grinding to obtain the filtration control lubricant used by the high-temperature horizontal well and directional well. Vegetable gum adopted in the preparation method is heteropolysaccharide and has a branch structure, so that the filtration control lubricant has a good lubricating effect, and a coefficient of friction resistance of a mud cake is obviously reduced; in addition, the plant polyphenol material is used as an additive of the glycan drilling fluid treatment agent, so that the structure of glycan can be stabilized by intermolecular forces of a hydrogen bond and the like, the glycan drilling fluid treatment agent is difficult to degrade and decompose when the filtration control lubricant is used at a high temperature, and temperature resistance can be improved to 150 DEG C or more.

Description

technical field [0001] The invention relates to the technical field of preparation and application of an environment-friendly horizontal well drilling fluid, in particular to a preparation method of a fluid loss control lubricant used in a high-temperature horizontal well directional well. Background technique [0002] Drilling fluid is a general term for various circulating fluids that meet the needs of drilling work with its multiple functions during the drilling process, and is known as the "blood" of drilling engineering. Drilling fluid treatment agent is the core of drilling fluid, it plays a very important role in adjusting the rheology of drilling fluid. With the development of oil exploration and development to the ocean and deep formations, the drilling conditions are becoming more and more complex, and there are more and more horizontal wells and directional wells, which have higher and higher requirements for drilling fluid treatment agents. The development of ne...

AI Technical Summary

Problems solved by technology

[0003] At present, on the one hand, polysaccharide materials, such as modified starch and modified cellulose, are often used as environmental-friendly drilling fluid treatment agents for horizontal wells and directional wells, which are easy to degrade and non-toxic, but there are also resistance Poor temperature resistance, generally suitable for environments below 120°C

However, with the deepening of oilfield development, the depth of the well is getting bigger and bigger, and its temperature is getting higher and higher, which makes these environmentally friendly drilling fluid materials unusable, and is forced to switch to some non-environmentally friendly polymers Drilling fluid material

On the other hand, these conventional polysaccharide materials have limited lubricity, and the mud cake formed has high friction resistance, which is not conducive to the use of highly deviated directional wells and horizontal wells. Generally, it is necessary to add a large amount of special lubricants to reduce friction resistance , to ensure drilling safety, which greatly increases the cost of drilling and the complexity of drilling fluid preparation