SU1602969A1 - Method of eliminating pipe string seizure in hole - Google Patents

Abstract

The invention relates to the technology of extracting oil from wells drilled in permafrost, and can be used in the underground repair of wells. The goal is to provide the possibility of eliminating the sticking of the frozen cork in the rod string. The upper part of the column is fixed to the hook of the lifting unit with the possibility of free axial rotation of the hook relative to the column. Then, tension of the column is cyclically created with simultaneous rotation of its upper part using a manual key. The initial tension is no more than 2 kN, and the twist angle is no more than 5 rad. After tensioning with simultaneous twisting, the torsional and tensile loads are completely relieved. During each process, the amount of stretching of the pipe string at the wellhead is recorded and the pipe string is returned to its original position. With an increase in the expansion of the pipe string at the mouth by 0.1 ... 0.15 m per 100 m of the length of the pipe string, the tension force in the next cycle is increased by 0.1 ... 0.2 kN with a simultaneous increase in the twist angle at rotation up to 4 ... 5 glad per 100 m length of the pipe string. 3 il.

Description

The invention relates to the technology of oil production from wells drilled in permafrost rocks, and can be used in the underground repair of wells.

The aim of the invention is to provide the possibility of eliminating the sticking of the frozen tube of the tubing string.

FIG. 1 shows a scheme for implementing the method; in fig. 2 - rod column pipes with drilling elements; in fig. 3 is a section A-A in FIG. 2

In the well 1, on the columns of pipes 2 and the sucker columns of pipes 3, a shtangovye pump 4 was lowered. The columns of rods are connected by sleeves 5, and on the expanding part of the sucker rod columns there are installed drilling elements 6, the dimensions of which in cross section correspond to the dimensions of sleeves 5. Elements 6 are fixed on tubing strings rigidly in order to avoid stalling or twisting when drilling frozen plugs.

The method is carried out as follows.

After the fact of the fact that the pipe string is stuck in the course of an underground well repair, the upper part of the column is attached to the hook of the lifting unit with the possibility of free axial rotation of the hook relative to the column. Then, tension of the column is cyclically created with simultaneous rotation of its upper part with the help of a manual key.

with

cha The initial tension force is no more than 2 kN, and the twist angle is no more than 5 rad. After tensioning with simultaneous twisting, the torsional and tensile loads are completely relieved, so that the thrust pipe string returns to its original position, and the repeated loading cycle occurs without accumulation of stresses and elastic deformations in the solid shaft. The twisting of the shtangs is carried out in the same direction in which the rods are screwed. The repeated loading cycle is performed with a slight increase in the load and angle of rotation of the rods in such a way that the growth rate of the forces on the hook of the lifting unit does not exceed 0.1-0.2 kN per | cycle, and the twisting angle is 4–5 rad per 10 mm of the length of the pipe string. An estimate of the required twisting angle is made by registering the expansion of the rods at the mouth at the point of suspension. When registering an increase in the expansion of the pipe string at the mouth by 0.1 ... 0.15 m per 100 m of the length of the pipe string, the tension and twisting angle in the next cycle increase as indicated.

This loading mode corresponds to the optimum one in terms of effective destruction of the frozen plug and prevention of excessive loading of the tubing string and its breaking.

The initial cycles of loading and rotation of the rods allow to break the plugs in the upper sections of the tubing. Increasing the loads and twisting angles of the rod string of pipes makes it possible to increase the depth of the impact of the rod string of pipes on the frozen plug up to the lower boundary of the permafrost interval.

After the drilling elements of the 6th rod column will destroy

0

0

five

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five

plugs to adjacent upstream sleeves, the entire column is pulled to the surface.

Example. The well with a depth of 1300 m is equipped with a sucker rod of 19 (60%) and 22 (40%) mm rods. The 75 upper booms are pre-equipped with drilling elements. After a long stop, the rods are stuck in the frozen stopper. The initial loading cycles were carried out with hook forces of 0.1-0.15 kN and twist angles of 0.2-0.5 rad. Subsequently, the twisting angles were adjusted to 4.5-5.2 rad per 100 m. After 46 loading cycles, the passage for the coupling joints was drilled throughout the permafrost interval and the shtangov column was removed from the well.

Claims (1)

Invention Formula A method of eliminating sticking of a pipe string in a well, which includes drilling the rock around a pipe string by rotating the pipe string with simultaneous tension, characterized in that, in order to ensure that the dead plug of the pipe string can be removed from the frozen pipe plug, while the pipe string is simultaneously tensioned, t cyclically, and during each cycle, the amount of stretching of the pipe string at the wellhead is recorded and the pipe string is returned to its original position, while increasing the stretching of the pipe string at the wellhead by 0.1 - 0.15 m per 100 m of the length of the pipe string, the tension force in the next cycle increases by 0.1-0.2 kN with a simultaneous increase in the twisting angle when rotating to 4-5 rad per 100 m of the length of the pipe string.  -.I 1 I Fi g