RU2313636C2 - Method for pipeline pulling through horizontal hole under water and other natural and artificial obstacles - Google Patents

Abstract

FIELD: machines for digging horizontal holes in the soil.

SUBSTANCE: method involves drilling horizontal hole by well-known method and pulling pipeline filled with liquid through the hole. Hole reaming assembly is preliminarily formed. Well drilling with expansible assembly is accompanied by recording of data received from reamer puling force sensor in dependence of sensor depth to determine hole areas having complicated cross-sections. Then pipeline pulling assembly is created. Pipeline pulling assembly comprises drill pipe string connected to pipeline head having antifriction composition supply nozzles protected against ground ingress and antifriction composition metering device provided with piston arranged therein. The piston is controlled by liquid pressure inside pipeline. Device also has pipeline liquid pressure control and discharge. As pipeline head enters in said hole areas having complicated cross-sections during pipeline pulling liquid pressure is increased with the use of compressor or pump station and metering device located in head and said hole section is treated with antifriction composition.

EFFECT: increased reliability of pipeline laying due to prevention of pipeline insulation damage during pipeline pulling through horizontal hole.

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Description

The invention relates to methods for dragging a pipeline in a horizontal well under water and other natural and artificial barriers.

A known method of dragging a pipeline, which consists in dragging a pipeline that is not filled with any liquid. (1) O.N. Blagov, G.G. Vasiliev, Yu.A. Goryainov and others. Training manual of the Russian State University of Oil and Gas. The construction of underwater passages of gas and oil pipelines by the method of directional drilling. M., 2003, p. 183.

The disadvantages of this method is the emergence of the pipeline inside the horizontal well bore filled with drilling fluid under the action of the Archimedean force for pipes Dy> 500 mm, resulting in friction of the pipeline on the upper wall of the wellbore and destruction of the insulation of the pipeline.

The closest in technical essence to the achieved result is a method of dragging a pipeline filled with ballasting fluid. (2) O.N. Blagov, G.G. Vasilyev, and Yu.A. Goryainov. Teaching aid. Russian State University of Oil and Gas. The construction of underwater passages of gas and oil pipelines by the method of directional drilling. M., 2003, p. 183.

In the known method, the pipeline has "zero" buoyancy and does not float. Moreover, in the wellbore, which does not have complex geometric sections of the profile and abrasive rocks, the insulation is not damaged.

The disadvantage of this method is that in complex sections of the wellbore profile or in areas having abrasive rocks, the presence of "zero" buoyancy does not completely exclude the friction of the dragged pipeline against the walls of the well and the destruction of its insulation, which reduces the reliability of trouble-free dragging of the pipeline.

The objective of the present invention is to increase the reliability of trouble-free dragging of the pipeline by preventing destruction of the insulation of the pipeline when dragging it in a horizontal well.

The essence of the present invention lies in the fact that in the known method of dragging a pipeline in a horizontal well under water and other natural and artificial barriers, comprising pre-drilling a horizontal well in a known manner and dragging a pipeline filled with liquid, according to the invention, the assembly is preassembled to expand the well during the sinking wells with an expanding arrangement record the readings of the sensor for pulling force of the expander depending from the depth of its location, while determining the complex sections of the well profile, then the assembly for pulling the pipeline is assembled, including a drill pipe string connected to the piping head, having nozzles for supplying antifriction composition protected from soil, a dispenser for antifriction composition inside which the piston is located controlled by the fluid pressure in the dragged pipeline, a device for monitoring and relieving fluid pressure in the pipeline, and in the process of dragging the pipe wires, when the ogolovnik of the pipeline gets into predetermined complex sections, they increase the pressure of the liquid in the pipeline with the help of a compressor or a pumping station and a metering device located in the ogolovnik, and the complex section is treated with an antifriction compound.

Figure 1 presents the layout for the implementation of the proposed method.

Figure 2 presents ogolovnik 4 for the supply of anti-friction composition in the context.

The method is as follows.

The assembly is preliminarily assembled for the expansion of the well and, during the passage, the expanding arrangements record the readings of the extender pulling force sensor depending on the depth of the expander in the well, while determining complex sections of the well profile.

Then the assembly for dragging the pipe 6 is assembled, including a drill pipe string 3, a specially designed headband 4 of the pipe 6, which has nozzles for supplying antifriction composition protected from soil, a dispenser for antifriction composition 5, inside of which a piston 10 is located, controlled by fluid pressure 11 in the pipeline 6, a control device and pressure relief fluid 7 in the pipeline 6 and the compressor 8.

Piping of pipeline 6 is carried out using a horizontal drilling rig (UGB-150) 1, while continuous monitoring of complex sections 9 of the wellbore is carried out using a force sensor 2 installed on the support of the UGB-150 installation.

When the ogolovnik 4 of the pipeline 6 gets into predetermined complex sections, the pressure of the liquid in the pipeline 6 is raised using a compressor 8 and a metering device 5 located in the ogolovnik 4. At the same time, the complex section 9 of the wellbore is treated with an antifriction compound by partially extruding it into the annulus.

After that, the pressure of the liquid in the pipeline 6 is dropped and a further pulling of the pipeline 6 is carried out.

The operation is repeated until the pipeline 6 is completely dragged.

The inventive method in comparison with the prototype method provides increased reliability of trouble-free dragging of the gas pipeline in a horizontal well under water and other natural and artificial barriers.

Claims (1)

A method of dragging a pipeline in a horizontal well beneath water and other natural and artificial barriers, comprising pre-drilling a horizontal well in a known manner and dragging a pipeline filled with liquid, characterized in that the assembly is pre-assembled for expansion of the well and the pressure sensor reads the pressure gauge during expansion of the well dragging the expander depending on its depth, while determining complex sections of Ofile of the well, then the assembly for pulling the pipeline is assembled, including a drill pipe string connected to the piping head, having nozzles for supplying antifriction composition protected from soil, a dosing device of antifriction composition, inside of which there is a piston controlled by fluid pressure in the dragged pipeline, a control device and pressure relief of the liquid in the pipeline, and in the process of dragging the pipeline, when hit by the end of the pipeline in advance ennye complex plots raise the fluid pressure in the pipeline by means of a compressor or a pump station and the metering device mounted in the end cap, and make processing difficult section antifriction composition.

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