Non-pollution well detergent

Abstract

A non-pollution flushing fluid for oil field and oil well hot bath consists of poly-amine polyoxytrimethylene polyethenoxy ether 2.5-6.8 wt%, aliphatic alcohol polyethenoxy ether sodium sulfate 12-20 wt%, alcohol ether sulpho-succinic monoester di-sodium salt 5-8 wt%, FC-NO1 fluorocarbon surface activator 0.05-0.15 wt% and water 66-80 wt%. Non-pollution flushing fluid 0.1-0.5 wt% is added into oil well hot-bath water, it has strong flushing bubbling ability, less pollution for stratum, better activity and washing function for paraffin, gum and asphalt; Fine foam is injected by stratum air pressure and flushing pressure difference, which makes liquid density lower and level raise, it increases draining and carrying abilities, and decreases oil pipeline gum, asphalt and was adsorption.

Description

technical field [0001] The invention belongs to the technical field of chemicals used in the petroleum industry, and in particular relates to a formula and a preparation method of a pollution-free well-flushing fluid used for oil well thermal washing. It is suitable for the hot washing of low-permeability oil wells in the process of oilfield development. The dosage is 0.1%-0.5%. It solves the pollution of the oil layer due to the pollution of sewage or clean water well washing fluid, which causes the production of oil wells to decline or even produce no fluid. Background technique [0002] At present, the wax removal method of mechanical oil recovery wells in various oil fields usually adopts hot washing method, which is not only an effective measure to ensure long-term stable production of oil wells, but also the main means to extend the maintenance-free period of oil wells. However, when washing the well, the energy consumption is high and the cost is high; there are many ...

AI Technical Summary

Problems solved by technology

Solve the problem of oil layer pollution caused by well flushing fluid during thermal flushing of oil wells