Abrasive jet system for cutting downhole casing and method of use thereof

Abstract

The invention discloses an abrasive jet flow system for cutting a downhole casing and an application method thereof. The abrasive jet flow system comprises a water tank, an abrasive jet flow generator, an oil pipe, a downhole centralizer and a spray gun which are connected in sequence, wherein the end of the spray gun is provided with axial blind holes communicating with the downhole centralizer;a plurality of nozzle holes communicating with the axial blind holes are distributed radially and uniformly in multiple radial planes of the spray gun; a nozzle is arranged in each nozzle hole; each nozzle includes a base, an outer nozzle and an inner nozzle which are coaxially arranged; one ends of the bases are connected with the nozzle holes; the inlet ends of the outer nozzles are connected with the outer edges of the end faces of the bases, and are enclosed with the bases to form mixing chambers; the side walls of the outer nozzles are radially provided with a plurality of suction inletscommunicating with the mixing chambers; and the inner nozzles are arranged in the mixing chambers and the inlet ends of the inner nozzles are connected with the centers of the end faces of the bases,and the outlet ends of the inner nozzles communicate with the mixing chambers. The abrasive jet flow system can achieve the recycling of materials and is especially suitable for remote mountainous areas with inconvenient transportation or water shortage, and the application method is simple and high in practicability.

Description

technical field [0001] The invention relates to oil and gas downhole plugging technology, in particular to an abrasive jet system for cutting downhole casing and a method for using the same. Background technique [0002] In recent years, with the rapid development of our society, the demand for oil and natural gas resources has become greater and greater, and the exploitation efforts have also increased. With the increase of oil and natural gas mining time and the depletion of local oil and gas resources, more and more Oil and gas wells are approaching their service life and have lost their value for continued use, and oil and gas wells have also completed their missions. In order to prevent oil and gas pollution, for the oil and gas wellheads that have reached the service life, they need to be abandoned in accordance with national regulations to seal the oil and gas wells. However, sealing the wellheads cannot achieve the desired effect. It is necessary to drill and mill a ...

AI Technical Summary

Problems solved by technology

However, their research and equipment are mainly used in offshore oil well casing cutting, which can only cut the tubing, but not milling in segments; using pre-mixed abrasive water jets to add abrasives must release pressure, and continuous work cannot be guaranteed during operation; abrasives , Water consumption is large, not suitable for remote or water-scarce land areas

Images