An open coiled tubing injector and method of use thereof

Abstract

The invention discloses an open-type coiled tubing injector and a using method thereof. According to the technical scheme, the open-type coiled tubing injector is composed of a continuous driving device comprising an outer supporting frame, an inner supporting frame, driving chain wheels, clamping chains, driving motors, tensioning supporting wheels, clamping hydraulic cylinders, clamping pressing wheels, tensioning hydraulic cylinders and a weighing mechanism; the outer supporting frame bears the weight of the driving device during normal working and loads of an underground tubular column, when the driving device needs to be separated from coiled tubing working in a well, the outer supporting frame provides unloading conditions for the driving device, and separation or clamping of the driving device and the coiled tubing working in the well is completed. The open-type coiled tubing injector and the using method thereof have the advantages that when the coiled tubing conveys fluid in the well, the injector can be separated from the working coiled tubing from any position of the middle of the coiled tubing, the utilization rate is increased, and replacement and maintenance of the injector breaking down in use are facilitated greatly.

Description

technical field [0001] The invention relates to an oil extraction device and method in the petroleum industry, in particular to an open coiled tubing injector and a method for using the same. Background technique [0002] At present, the existing coiled tubing is widely used in oilfield development. It has shown good performance in the fields of oil well sand flushing, gas lift drainage and induced blowout, low-permeability oil reservoir fracturing, gas well exhaust gas production, well workover operations, drilling and other fields. It can be operated under pressure, has the advantages of high operation efficiency, high degree of mechanization and good safety, etc. It is praised as a universal operating machine by oilfield people. The equipment cannot meet the requirements of the new technology, mainly in: the current wellhead tripping device of the coiled tubing—that is, the load-bearing support frame of the coiled tubing injector and the chain holding the coiled tubing ar...

AI Technical Summary

Problems solved by technology

[0002] At present, the existing coiled tubing is widely used in oilfield development, and has shown great promise in the fields of oil well sand flushing, gas lift drainage, low permeability reservoir fracturing, gas well exhaust and gas recovery, workover operations, and drilling. It can be operated under pressure, has high operating efficiency, high degree of mechanization, and good safety. It is praised as a universal operating machine by oilfield people. The equipment cannot meet the requirements of new technology, mainly in the following aspects: the existing coiled tubing wellhead tripping device—that is, the load-bearing support frame of the coiled tubing injector and the chain holding the coiled tubing are all closed structures, and the coiled tubing It can only be penetrated longitudinally from the upper or lower end of the injector, and parts other than the end of the coiled tubing cannot be laterally removed from the injector

In this way, some well injectors that use coiled tubing to inject fluid downhole for a long time cannot be removed from the coiled tubing that has been in operation for a long time, and the injector is in the "idle" state at the wellhead for a long time. The economical efficiency of well work has deteriorated, and the popularization and application of the technology has been limited.

Images