High-temperature-resistant composite filtrate reducer for seawater drilling fluid and preparation method of high-temperature-resistant composite filtrate reducer

Abstract

The invention relates to the technical field of filtrate reducer for drilling fluids, and in particular, relates to a high-temperature-resistant composite filtrate reducer for a seawater drilling fluid and a preparation method of the high-temperature-resistant composite filtrate reducer. A main chain of the filtrate reducer is chemically modified by using nanocrystalline cellulose, so that a polymer A-C-C has excellent filtrate reduction performance and thermal stability, the specific high-temperature-resistant filtrate reducer sodium nitrohumate is preferably selected to be compounded with the polymer A-C-C for use, a synergistic effect is exerted, and the performance of the compound filtrate reducer is further improved. The high-temperature-resistant composite filtrate reducer for the seawater drilling fluid has the advantages of excellent filtrate reduction performance, high temperature resistance and the like, the preparation raw materials are low in acquisition difficulty and easy to biodegrade, and the high-temperature-resistant composite filtrate reducer has good environmental protection performance and wide application prospects.

Description

technical field [0001] The invention relates to the technical field of fluid loss reducers for drilling fluids, in particular to a high-temperature resistant composite fluid loss reducer for seawater drilling fluids and a preparation method thereof. Background technique [0002] With the continuous development of oil and gas exploration and development, especially the gradual deepening of offshore exploration, higher requirements are put forward for the performance of drilling fluid additives. Commonly used fluid loss control agents generally have problems such as poor high temperature resistance and poor fluid loss control performance, which not only affect the production of oil and gas wells, but may also cause serious ecological pollution to the operating environment. Aiming at the high temperature resistance performance, many researches are currently focused on the development of copolymers based on sulfonic acid monomers such as AMPS. However, the molecular chains forme...

AI Technical Summary

Problems solved by technology

The fluid loss control agent can only meet the fluid loss control requirements at a temperature of 150°C, and its main components are modified starch and polyacrylonitrile hydrolyzate, both of which have poor high temperature resistance, which can be seen in the operation above 150°C It is difficult for the fluid loss control agent to achieve a satisfactory fluid loss control effect in the environment

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