Polyether amine compound as well as preparation method and application thereof

Abstract

The invention provides a polyether amine compound. The chemical structural formula of the polyether amine compound is as shown in the specification, wherein n and m are selected from natural numbers 1-20, and R1 and R2 are selected from H, methyl, ethyl and isopropyl. The polyether amine compound provided by the invention is used as a clay stabilizer in the operation process of gas well reparation; and by virtue of proper polymer molecular weight as well as type and number of compound functional groups, the prepared compound has a good clay anti-swelling rate, and the problems existing in compatibility, acid-alkali resistance and the like of partial ionic clay stabilizers which are adopted currently are effectively overcome.

Description

technical field [0001] The invention belongs to the technical field of oil and gas field development, and in particular relates to a polyetheramine compound, a preparation method and an application. Background technique [0002] In the process of oil and gas exploitation, the protection of reservoirs is of great significance to the continuous production and later development of oil and gas fields. The application of clay stabilizers is an important part of formation protection technology. Adding appropriate clay stabilizers to working fluids such as drilling fluids, well completion fluids, well killing fluids, and workover fluids can effectively reduce the hydration expansion and Disperse the formation damage caused by migration to avoid the decline or even loss of productivity of oil and gas wells. [0003] Commonly used clay stabilizers are inorganic salts, cationic surfactants, quaternary ammonium salt surfactants, polyamines and polyquaternary amines. Inorganic salt cl...

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Problems solved by technology

Inorganic salt clay stabilizers have the advantages of wide supply, cheap price, convenient post-treatment, and good short-term anti-swelling effect. The disadvantage is that the long-term effect is insufficient, and they can only temporarily stabilize clay. Some cations in the foreign fluid of the formation are easy to replace inorganic When the salt undergoes ion exchange and the concentration of the inorganic salt gradually decreases to a certain extent, the clay stabilizer will fail; the anti-swelling effect of the cationic surfactant is better than that of various inorganic salts, with strong attraction, long-term effect, and durability. Strong scouring ability, but when cationic surfactant is used as clay stabilizer, its compatibility with most anionic treatment agents in drilling fluid is poor, and it has high requirements for pre-fluid and post-fluid, and it is easy not to mix and react. It can cause blockage, and can change the wettability of the reservoir, changing the wettability of the reservoir from water to oil, causing certain damage to the reservoir; quaternary ammonium salt clay stabilizers are poor in acid and alkali resistance, especially TMAC and other alkyl quaternary ammonium salts with complex structures are toxic and have a certain impact on the environment. When used in high-solid drilling fluids, serious flocculation will occur; polyamine has a short validity period and high cost; The relative molecular weight of polyquaternary amines is large, which will aggravate the damage to low permeability

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