Device and method for wirelessly positioning depths of strings in real time during coiled tubing operation

Abstract

The invention discloses a device and a method for wirelessly positioning the depths of strings in real time during coiled tubing operation. The device comprises a downhole depth measuring probe tube assembly and a ground data processing device. The downhole depth measuring probe tube assembly comprises a barrel, a downhole turbine generator, a CCL-GR probe tube and a pulse generator, and the downhole turbine generator, the CCL-GR probe tube and the pulse generator are arranged inside the barrel. The method includes enabling the downhole turbine generator to provide power for the CCL-GR probe tube and the pulse generator; enabling the CCL-GR probe tube to detect and collect casing coupling position and / or stratum gamma data, converting the casing coupling position and / or stratum gamma data into electric signals, starting and stopping of the pulse generator under the control to convert the electric signals into pressure pulse signals attached into circulating liquid, and transmitting the pressure pulse signals to the ground data processing device; enabling the ground data processing device to acquire the pressure pulse signals by the aid of a pressure sensor, decoding the pressure pulse signals and comparing the decoded pressure pulse signals to standard coupling depth or / and gamma curve data to obtain depth data of the strings. The device and the method have the advantage that the depths of the strings can be accurately acquired in real time by the aid of the method for measuring the depths of the strings by the device during coiled tubing operation.

Description

technical field [0001] The invention belongs to the field of petroleum and natural gas development, in particular to a wireless real-time depth positioning device and method for a coiled tubing operation string. Background technique [0002] At present, coiled tubing operation involves almost all conventional operations, and has been applied in many fields such as drilling, completion, logging, workover and stimulation measures. Currently, there are three methods for calibrating the depth of coiled tubing strings: artificial bottom hole probing method, pipe end positioning calibrating method and mechanical casing collar locator method (MCCL). [0003] The artificial well bottom calibration method is based on the artificial well bottom as the reference point, and after running the coiled tubing to the bottom of the well, mark this point on the coiled tubing as the standard depth position. Once the bottom hole depth is inaccurate, or has the influence of sand settling, casing...

AI Technical Summary

Problems solved by technology

However, if the elongation and compression data are different in the open hole section, the screen well section, the casing section, or the lifting and lowering, this method is subject to certain limitations.

In addition, due to the long-term wear and corrosion of the inner surface of the casing collar in the old well, the gap of the collar is smooth, so that the positioning key cannot be hung and the position point cannot be obtained.

[0006] The three methods introduced above have failed to solve the problems of precise positioning depth of coiled tubing strings and depth positioning affected by external disturbances.

For some coiled tubing operations such as coiled tubing transmission perforation, sandblasting perforation, thin interlayer fracturing, selective fracturing and acidizing, testing and fluid production profile logging, etc., according to technical standards, it is necessary to accurately position and correct the depth, while Coiled tubing's own depth measurement device and existing sounding methods cannot accurately measure the depth of the tubing string and the position of the oil layer. Therefore, accurate depth calibration of the coiled tubing operation string has become a difficult problem at home and abroad

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