SU1523653A1 - Method of cementing casing in boreholes - Google Patents

Abstract

The invention relates to casing cementing in oil and gas wells. The goal is to increase the effectiveness and quality of casing cementing along its entire length. During the process of forcing a cement slurry with a squeezing fluid, a downhole hydraulic vibrator transmits hydraulic pulses into the annulus formed between the borehole wall and the casing, and the lower part of the column vibrates. The frequency of the derived waves and vibrations of the column is determined and controlled by the flow rate. At the same time, hydraulic pulses are transmitted from the mouth using a generator. The frequency and phase of the hydrowaves and vibrations of the column are synchronized for maximum effect. After the completion of the push operation and the "Stop" pressure is obtained, a vibrator is turned on and the column is vibrated in the horizontal direction. These vibrations are transmitted to the cement slurry at rest in the annulus. The frequency of the vibro-waves is determined experimentally, depending on the properties of the cement slurry. At the same time, the vibration effect on the cement slurry from the wellhead and from the bottom of the well allows to create a monolithic cement ring throughout the wellbore or throughout the cemented interval throughout the entire height of the cement slurry in the annulus by increasing the length of the trunk subjected to wave action. 1 hp f-ly, 1 ill.

Description

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the annular space formed between the borehole wall and the casing, and vibrates the bottom of the column. The frequency of the derived waves and vibrations of the column is determined and controlled by the flow rate. At the same time, hydraulic pulses are transmitted from the mouth using a generator. The frequency and phase of the hydraulic waves and the vibrations of the column are synchronized for maximum effect. After the completion of the push operation and the pressure is received, the stop vibrator is turned on and the column is vibrated horizontally. These fluctuations

transferred to cement slurry that is in flow in the annulus. The frequency of the vibro-waves is determined experimentally, depending on the properties of the cement slurry. At the same time, the vibration effect on the cement slurry from the mouth and from the bottom of the well allows to create a monolithic cement ring throughout the wellbore or throughout the cemented interval over the entire height of the cement slurry in the annulus. space by increasing the length of the trunk subjected to wave action. 1 hp f-ly, 1 silt;

The invention relates to the oil industry and can be used for cementing casing in oil and gas wells.

The aim of the invention is to improve the efficiency and quality .. of the casing stalk along its entire length,

The drawing shows the cementing scheme.

The method is carried out as follows.

In the lower part of the casing t, one of the known hydraulic downhole vibrators or vibration pads 2 operating from the energy of the cement slurry 3 is installed. A device is installed on the wellhead that seals the annulus with the outlet pipe branch 5o. The known generators 6 are installed on this wellhead. hydraulic shocks (flow interrupters), the operation mode of which. controlled by hydraulic or electric drive. A mechanical vibrator 7 is rigidly fixed to the upper part of the column, under the rotor table 8 at point A or above the table of rotor at point B, if it is not possible to fix it under the rotor.

In the process of forcing the tamping solution 3 with a squeezing fluid E, the downhole hydraulic vibrator 2 transmits the hydraulic pulses into the annulus formed between the borehole wall 10

n casing, and vibrates the bottom of the column. The frequency of the derived waves (pulses) and vibrations of the column is determined and regulated by the flow velocity.

At the same time, hydraulic pulses are transmitted from the mouth with the help of generator 6. Moreover, the frequencies of the hydraulic waves and the vibrations of the column are synchronized to obtain the maximum effect (based on the superposition principle). After the completion of the push operation and the pressure is received, the stop vibrator 7 is turned on and the column is vibrated in the horizontal direction. These oscillations are transmitted to the cement slurry at rest in the annulus. The frequency of the vibration waves is determined experimentally depending on the properties of the cement slurry. For most of the solutions currently used, the oscillation frequency required is in the range of 20-150 Hz.

Simultaneous vibration impact on the cement slurry from the wellhead and downhole allows the creation of a monolithic cement ring throughout the wellbore or throughout the cemented interval (throughout the entire height of the cement slurry in the annulus) by increasing the iprotensity of the wellbore exposed to the wave impact.

Claims (2)

Invention Formula f. 1, Method of casing cementing in boreholes, includes 5,152,3653. Injecting the injection of the mortar and the bottom at frequencies of vibrowave 20 into the column and pushing it in for 150 Hz, the exposure starts at tubular space while simultaneously pushing the cement in-plant vibration impact, o t - the thief into the annular space in that, in the longitudinal direction, and at the end The effect of increasing efficiency and quality pushing is transverse. wa cementing columns all over her length, additionally carried out 2. The method according to claim 1, distinguishing the wave effect on the cementing UC and with the fact that, when pressed, the solution by applying the hydropercussion of the cement slurry to the annular pulses, the vibrating-wave space of the hydropercussion impulse along the wellbore when carried out simultaneously with the mouth of the oscillation frequency synchronization.