Gas lift unblocking technology by chemical method

Abstract

The invention relates to a chemical method gaslift plug removal technology for oil and water well, which is characterized in that acid and carbonate are adopted to react in the oil and water well pipe to generate gas so as to cause gaslift function, and stronger negative pressure will generate at the region near the well, and the plug removal technology for removing the plug of oil and water well by acid dipping is performed in the oil and water well. The operation technology is that: acid solution and carbonate solution which can generate CO2 are prepared; a single pump pumps the prepared acid solution from the well head to the upper part of the oil reservior to dip the oil reservior; then two pumps pump other acid solution and all the carbonate solution into the well; the well is closed to guarantee that the acid solution and the carbonate solution can fully disperse, contact and react with each other; and finally the well is cleaned to guarantee maximum gaslift effect. The invention can be adapted to plug removal for various oil reservoirs, has better plug removal effect for low permeability and very low permeability oil reservoirs, has low cost and good safety and environment protection performance, and can regulate the gaslift effect by changing the mount of reactants, and thereby is simple in regulation and is in favor of popularization.

Description

technical field [0001] The invention relates to an oil-water well plugging removal technology, in particular to a chemical method gas lift plugging removal technology that uses a chemical method to cause a "gas lift effect" to remove the plugging. Background technique [0002] At present, the plugging removal techniques of oil and water wells in various oil fields are mainly divided into three categories: chemical plugging removal, physical plugging removal, and physical-chemical plugging removal. There are many types of chemical plugging removal and physical-chemical plugging removal, but secondary damage to the oil layer is common, and the labor intensity of construction personnel is high, and it is harmful to human health. In addition, the above two plugging removal processes have a high risk factor due to long-term high-pressure extrusion injection. In special cases, some formations have extremely poor physical properties and belong to ultra-low permeability reservoirs,...

AI Technical Summary

Problems solved by technology

The biggest defect of this process is that the blockage still exists and has not been eliminated, let alone discharged from the formation, so there is a great potential for damage

Although the above types of processes are effective, they have many disadvantages such as high construction cost, large environmental pollution, labor intensity and high risk factor.