Abrasive perforating unblocking method and device for coiled tubing

Abstract

The invention provides an abrasive perforating unblocking method and device for coiled tubing. The device comprises a liquid tank, a skid-mounted sand mixing unit, high-pressure pumping-in equipment, coiled tubing equipment and an ejector, wherein a sand carrying liquid is stored in the liquid tank, and an input pipe of the skid-mounted sand mixing unit is connected with the liquid tank; an input end of the high-pressure pumping-in equipment is connected with an output pipe of the skid-mounted sand mixing unit; the coiled tubing equipment is wound with the coiled tubing, and a high-pressure inlet of the coiled tubing equipment is connected with an output end of the high-pressure pumping-in equipment through a pipe; the high-pressure inlet is communicated with the coiled tubing; the ejector is connected onto the coiled tubing. According to the unblocking method, the ejector is lowered into a pipe column for operation by the aid of the unblocking device. According to the method and the device, abrasive perforating can be performed on pipe columns with smaller inner diameters, a production channel is communicated, and production of oil-gas wells is recovered.

Description

technical field [0001] The invention relates to a device and method for sandblasting and perforating in an oil field to connect oil and gas well production channels, in particular to a device and method for removing plugging by coiled tubing sandblasting and perforating in the field of oil, gas and water well production. Background technique [0002] During the production process of oil and gas wells, due to factors such as formation sand production and near-wellbore pollution, the production channels are blocked, and the production of oil wells decreases. It is necessary to communicate the production string with the casing or the drainage channel of the formation. Often, the production strings of these production wells are composed of a series of tools with small diameters and variable diameters. It is very difficult to take this kind of production string out of the oil well by conventional treatment methods, and some snubbing operations are risky, and the entire constructi...

AI Technical Summary

Problems solved by technology

Among them, multi-stage sliding sleeve fracturing with fixed string is currently a widely used fracturing technology, but sand plugging often occurs during the fracturing process, which leads to interruption of the fracturing process. Spacers and sliding sleeves, the pipe diameter is small, once sand plugging occurs, subsequent fracturing will not be possible, and conventional operations cannot be completed

During the flowback process, the fracturing balls cannot be returned, resulting in the blockage of the production channel. There is also the problem that the inner diameter of the sliding sleeve is too small, which cannot be handled by conventional operations, and the oil and gas well cannot be put into production.

[0004] There are also accidents in some special wells during the drilling process or production process, which cannot be dealt with or the cost of treatment is too high, and the well needs to be completed in advance or the accident should be dealt with urgently, and it is urgent to connect the circulation channel

Due to the complexity of the pipe string, the inner diameter of the pipe string is too small, and there is a change in diameter, it is impossible to complete the completion or production operation in the later stage by using conventional operations

[0005] A three-phase cavitation abrasive water jet cutting device in the prior art, the main problem when it is applied to on-site construction is: the device adopts the post-mixing method, the amount of abrasive used is limited by the volume of the sand tank, and continuous sand supply cannot be realized. Compared with adjusting manual control according to the on-site construction displacement, the controllability is poor and there is no way to monitor

[0006] In the prior art, there is also a mining abrasive water jet cutting method and device. The main problem of applying this device to on-site construction is that it can realize the sand mixing of coiled tubing, but the sand ratio is controlled by a manual valve. Frequent, manual adjustment of sand ratio is uncontrollable

The spray gun is suitable for ground cutting operations, but not for underground operations

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