A preparation method of temperature-sensitive flow pattern regulator for deepwater water-based drilling fluid

Abstract

The invention provides a method for preparing a temperature-sensitive flow pattern regulator for deepwater water-based drilling fluid, comprising the steps of: adding temperature-sensitive monomers, acrylic monomers, and amide monomers into deionized water, mixing evenly, Then adjust the pH of the system to 6.0-8.0 to obtain a mixed solution; add acrylate monomers, temperature-resistant monomers, and emulsifiers to the mixed solution, mix evenly, and then shear and emulsify to obtain a pre-emulsion; heat the obtained pre-emulsion To 55‑65°C, add the aqueous solution of the initiator drop by drop under the condition of stirring, and then add the aqueous solution of the crosslinking agent drop by drop to carry out the reaction; after filtering, washing, drying and pulverizing, it is obtained. The flow pattern regulator of the invention has good temperature response effect, can effectively adjust the low-temperature rheology of drilling fluid, meets the flow pattern regulation requirements in a large temperature span range, and has certain high temperature resistance.

Description

technical field [0001] The invention relates to a preparation method of a temperature-sensitive flow pattern regulator for deep-water water-based drilling fluid, belonging to the field of oilfield chemistry in the petroleum industry. Background technique [0002] With the continuous increase of domestic demand for oil and gas resources, the smooth exploitation of oil and gas resources in deep ocean areas has become an important guarantee for the sustainable development of my country's oil industry. my country's South China Sea oil and gas geological reserves are extremely rich, with about 24 billion tons of oil resources and about 1.4×10 natural gas hydrate resources. 5 It is one of the world's four major marine oil and gas enrichment areas, 70% of which are stored in deep water areas. Therefore, the efficient drilling and exploitation of deepwater oil and gas resources is an important guarantee for the sustainable development of my country's petroleum industry. [0003] H...

AI Technical Summary

Problems solved by technology

For example: Chinese patent document CN109054782A provides a temperature-sensitive polymer rheology regulator, the temperature-sensitive polymer rheology regulator is made of alkenyl amide and alkenyl sulfonic acid as reactants, after the pH value is adjusted to 7.0 , a copolymer initiated by an initiator at 55°C; the alkenylamide is selected from acrylamide, N,N-dimethylacrylamide, N,N-diethylacrylamide, N,N-dimethacrylamide Methylbisacrylamide, vinylcaprolactam and N-isopropylacrylamide; the alkenylsulfonic acid is selected from vinylsulfonic acid, vinylbenzenesulfonic acid, 2-acrylamido dodecylsulfonic acid and 2-methyl-2-acrylamidopropanesulfonic acid, but the above temperature-sensitive polymer rheology modifier has a temperature resistance of 130°C, which is difficult to meet higher temperature resistance requirements

[0005] The existing conventional deepwater water-based drilling fluid flow pattern regulators have the following disadvantages: (1) The temperature response effect is poor, the flow pattern regulation effect of the drilling fluid in the low temperature range is insufficient, and the viscosity increase is serious at low temperature; (2) The performance is affected by external conditions Seriously, the performance is unstable under different salt concentrations and pH; (3) The temperature resistance is insufficient and cannot adapt to the downhole high temperature formation environment

[0006] Therefore, there is an urgent need to develop a temperature-sensitive flow pattern regulator for deepwater water-based drilling fluids, so as to overcome the shortcomings of existing flow pattern regulators, such as poor temperature response, performance that is seriously affected by external conditions, and poor temperature resistance.

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