High-temperature salt-resistant fluid loss additive modified gum resin for drilling fluids

Abstract

The invention discloses a high-temperature salt-resistant fluid loss additive modified gum resin for drilling fluids, wherein the resin is prepared from the following raw materials: 220-240 parts of clear water, 30-40 parts of sodium methylallyl sulfonate, 10-15 parts of N,N-dimethylacrylamide, 0.5-1.0 part of a temperature-resistant monomer, 20-30 parts of methacryloyloxyethyl trimethyl ammoniumchloride, 3-5 parts of a chelating agent, 0.5-1.0 part of an initiator, 25-35 parts of a gum resin, 8-10 parts of a 40% sodium hydroxide solution, 5-10 parts of propylene oxide and 10-20 parts of an additive, wherein the temperature-resistant monomer is 4-vinyl guaiacol, the chelating agent is sodium citrate, the additive is polyvinyl alcohol powder, and the initiator is a combination of an azo initiator and a redox initiator. According to the invention, the high-temperature salt-resistant fluid loss additive modified gum resin has good temperature resistance, good salt resistance and environmental protection performance, solves the problems of poor temperature resistance, poor salt resistance, high production cost and complex process of the fluid loss additive in the existing drilling process, has strong biodegradability, and effectively reduces the pollution to reservoirs and environments.

Description

technical field [0001] The invention relates to a petroleum drilling fluid additive, in particular to a high-temperature salt-resistant fluid loss reducer modified gum resin for drilling fluid. The invention also relates to a preparation method of the high-temperature salt-resistant fluid loss reducer modified gum resin for the drilling fluid. Background technique [0002] With the increasing demand for oil due to industrial development, it is necessary to develop oil and gas resources stored deep in the formation, and there are high-temperature and high-salt conditions in the deep formation. In view of this feature, higher requirements are put forward for drilling technology. As an important drilling fluid treatment agent, fluid loss reducers have a direct impact on the performance of water-based drilling fluids due to their ability to withstand heat and salt. However, fluid loss reducers commonly used in the market are not effective in reducing fluid loss in high-temperatu...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a high-temperature salt-resistant fluid loss reducer modified gum resin for drilling fluid, which has good temperature and salt resistance and environmental protection performance, so as to solve the problem of fluid loss reducer in the current drilling process. The problem of poor temperature resistance and salt resistance, and the modified gum resin of the high temperature and salt resistance fluid loss reducer has strong biodegradability, which can effectively reduce the pollution to the reservoir and the environment

Images