SU1700217A1 - Method of determination stuck pipesъ upper boundary - Google Patents

Abstract

The invention relates to well logging. The goal is to increase the definition accuracy and research performance. The method is implemented by placing a contact sound level meter on the cable in a free-hanging state. Then the pipe string is stretched. As a result of the mechanical interaction of the stretching pipe string and the contacts of the device, acoustic noise arises, which is recorded by a sound level meter. The upper limit of sticking is determined by the location of the observation point, below which there is no deformation effect, no noise occurs and is not recorded.

Description

The invention relates to well logging,

The purpose of the invention is to improve the accuracy of determination and productivity of research.

The essence of the method is as follows. Acoustic noise generated by the mechanical interaction of a geophysical instrument stationed inside the column with the wall of the pipe being stretched is recorded at individual points in the well at depth, and the character of the change in acoustic noise is analyzed as the observation points approach the stuck point and at the location of the observation point below which acoustic noise is absent, they determine the upper limit of the sticking of the column.

The sequence of operations for implementing the method is as follows.

- a geophysical instrument (contact sound level meter) recording acoustic noise is let in on the logging cable into the column and is stopped at the first observation point located obviously above or below the upper limit of the sticking of the column;

- by means of a drilling rig, it produces axial stretching of the string from the wellhead with a force of about 100 tons (the maximum allowable tension of the drill string is about 250 tons);

In the process of applying and removing tensile force, a logging station records acoustic noise generated by mechanical

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interaction of the device with the wall of expandable pipes;

- in the event that acoustic noise is absent, the device is raised to 100-200 m and set against the second observation point, while, if acoustic noise appears, the device is lowered again and installed between the first and second observation points. These gradual approximations are repeated until the instrument is placed near the upper limit of the sticking point, and the upper limit of the sticking is determined by the location of the observation point 1, below which there are no acoustic noises;

- after determining the upper limit of the compression string, the downhole tool is retrieved to the surface and proceed to the technological operations to eliminate sticking.

High accuracy in determining the upper limit of sticking is achieved due to the fact

Its acoustic noise during mechanical interaction of the device with the wall of the colony is excited even with small axial displacements of the sections of the column of a relatively motionlessly mounted device, UL, iW practice shows, confident

noise recording can be carried out with axial movement of the column relative to the geophysical instrument (contact sound level meter) by 2-3 mm.

In addition, the method allows to increase

Claims (1)

the performance of the studies, bored-off does not require instruction to register two diagrams (up to m after extension). Invention Formula A method for determining the upper limit of sticking of a pipe string in a well, which includes placing -se geophysical instrumentation inside the column at observation points, stretching the column from the wellhead, registering sections of the string during the expansion of the deformation movement of the column, and that, in order to increase the fineness of the determination and the productivity of the research, the geophysical instrument is placed freely suspended relative to the pipe string, the acoustic drain arising from the mechanical the interaction of the device with the pipe wall, and the upper limit of the sticking of the pipe string is determined by the location of the observation point, below which there are no acoustic noises.