A kind of microemulsion completion fluid and its application

Abstract

The invention discloses a micro-emulsion completion fluid. The micro-emulsion completion fluid comprises the following components: an oil phase, a water phase, a surfactant, an auxiliary surfactant, a salt and a cleaning agent, wherein the cleaning agent is selected from an oxidant and a biological enzyme. The completion fluid provided by the invention has good comprehensive performance and facilitates cleaning of the formation damages caused by the drilling fluids, especially by the water-base drilling fluids; and the micro-emulsion completion fluid is capable of increasing crude oil yield when the well is put into operation. The completion fluid provided by the invention has wide application prospect.

Description

technical field

[0001] The invention relates to the field of drilling aids, in particular to a completion fluid for oil fields. Background technique

[0002] Drilling fluid is a general term for various circulating fluids that meet the needs of drilling work with its multiple functions in the process of oil and gas drilling. Drilling fluid is the "blood" of drilling and plays a very important role in drilling operations. The main functions of drilling fluid are: ①carrying and suspending cuttings; ②stabilizing the well wall and balancing formation pressure; ③cooling and lubricating drill bits and drilling tools; ④transmitting hydraulic power. During the drilling process, the drilling fluid must form a dense inner and outer filter cake to effectively prevent the solid and liquid phases from invading the reservoir, and the formed filter cake can be released through perforation. However, for non-perforated completions, the filter cake cannot be penetrated by perforation, and t...