Oil pipe continuous injection device, injection method andoil pipe changing method without stopping pump

Abstract

The invention relates to an oil pipe continuous injection device, an injection method and an oil pipe changing method without stopping a pump. The device comprise a main body seat and a main body pipe, the main body seat sleeves the main body pipe, the main body seat is provided with a wellhead connection end and an injection pipeline connection end, the main body seat and a wellhead is connected,the main body pipe is a round pipe, the two ends of the main body pipe are provided with an upper joint and a lower joint for connecting an oil pipe, a liquid inlet hole is formed in the main body pipe, and a sliding opening and closing device sleeves the main body pipe; the sliding opening and closing device comprises a sliding sleeve main body and a sliding sleeve return spring, and the slidingsleeve main body is provided with a sliding sleeve opening and closing gear; the main body seat is provided with an elastic steel ring corresponding to the sliding sleeve opening and closing gear; ahollow one-way valve body is included, one end of the valve body is connected to the upper joint, and the other end is connected to the main body pipe; the one-way valve body is provided with a valveball and a valve ball return spring in sequence. The device ensures continuous injection of well washing fluid.

Description

technical field [0001] The invention relates to a continuous injection device, an injection method, and a method for continuously pumping and changing oil pipes, which are specially used for high-inclination oil well washing and sand washing. Background technique [0002] Since horizontal wells were used in the development of low-permeability oilfields, their well structure characteristics and technical advantages have brought oil well single-well production and oilfield recovery to a new level, so people have paid more and more attention to and favored them. Horizontal wells The number is also gradually increasing. Because horizontal wells are often developed by large-scale multi-stage fracturing, the phenomenon of fracturing sand back-vomiting is relatively common, which will result in a decrease in fluid production and, in severe cases, the problem of sand-buried reservoirs. Well washing and sand washing must be carried out in time to ensure Only when the bottom of the w...

AI Technical Summary

Problems solved by technology

Since horizontal wells are often developed by large-scale multi-stage fracturing, the phenomenon of fracturing sand back-vomiting is relatively common, which will result in a decrease in fluid production and, in severe cases, problems in sand-buried reservoirs. Well washing and sand flushing must be carried out in time to ensure The bottom of the well is clean, and the oil well can produce normally

When performing conventional sand flushing, it is necessary to carry out tubing operation, and the pump needs to be stopped during the tubing connection process. However, due to the special wellbore structure of horizontal wells, once the pump is stopped, the suspended sand is easy to settle. A sand bridge is formed in the horizontal well section, and the oil pipe is stuck. If the jam is not released in time, it will cause an oil well overhaul accident, and in severe cases, the oil well may even be scrapped, bringing huge economic losses to the oil field.

Although there is coiled tubing technology that can avoid the operation of the connecting string, its promotion in low-permeability oilfields is limited due to its high cost of use. Therefore, a set of equipment and technology is urgently needed to solve this problem, and to develop oilfields for horizontal wells. Improve strong technical support

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