The way transportation pipe

 

(57) Abstract:

The invention relates to the construction of pipeline transport of oil and gas and is used in the repair of pipelines. New tube seal head cover and the flange of the adjacent cylinder. The new pipe is introduced into worn. For transportation of the new pipe is divided by the piston into two sealed cavity. Moving a new pipe is created by a change in air pressure in the cavity of the tube between the fixed piston and the cap. Reduced power consumption with the introduction of worn-out pipe new pipe. 4 Il.

The invention relates to pipeline transport of oil and gas and for the recovery of the performance characteristics of pipelines.

During operation of the tube the oil and gas pipelines are subject to corrosion. As a result, the inner and outer surfaces of the pipes are formed shell and the wall of the tube is stretched. This leads to accidents - breaks for oil and gas pipelines, since the working pressure in the pipes, providing transport their oil and gas, creates more stress in the pipe wall exceeding their strength. There is a natural fatigue of the metal pipes. Terms of use">

The consequences of such accidents not only cause loss of oil and gas, but also in the destruction of the pipes to a large extent to the contamination of surrounding land and water, the burning of vegetation [A. Sinkin. This pipe can fly all. The Russian newspaper, 27.02.1997,].

Elimination of consequences of accidents, and restoration of the damaged section of the pipeline and adjacent at him space and water is costly, and losses are irreplaceable [Y. Rubin. Royal chip. Magazine "securities Market" 20 (107). 1997. page 28].

It is necessary to ensure the reliability of pipelines through a major overhaul with replacement of pipes, due to the large volume of earthworks determined by the method of repair.

Known way to prevent accidents in the oil and gas pipelines, which consists in the fact that they make major repairs of the pipeline, located in the pre-emergency condition. According to this method, a trench in which the pipeline digging out the damaged section of the pipeline extracts, to take his place in a trench put a new tube, combine it with the pipeline, the trench is buried and restore the surrounding area is ruzena main gas and oil pipelines. -M. : Nedra. 1973. page 257, 258.]. This method is very time-consuming and costly than the construction of a new pipeline, as well as works associated with the laying of new pipe, includes a number of additional works by removing the worn part of the pipeline.

Earthworks are at least 30% of the cost of all works on construction of the pipeline.

Famous considered as a prototype method including laying a new pipe inside of the worn part of the pipeline. New pipeline choke from the front and rear ends, connect the thrust transfer device located inside the deteriorated pipe and injected into the old pipeline ( 0149528 A1, 24.07.1985, E 21 7/26, page 1-5).

The disadvantage of this method is the inability to create a large traction force at great length of the stacked tubes. This is because the adhesion of the self-propelled device with the inner wall of the deteriorated pipe is limited. The strength of coupling determines the tractive force, and therefore, is limited and the length of the laid pipe. Along with this power conveyors directly spent on moving the tube, which requires a large installation is italina repair of oil and gas pipes by transportation and laying of new pipe of greater length in worn-out pipe with minimal earthwork energy and generating capacity of the engine.

The problem is solved by the following set of features.

The method of conveying pipe, which consists in the fact that the new pipe choke and move cyclically within the deteriorated pipe, which serves the working agent under pressure on opposite sides of the piston placed in the cylinder, with respectively perform one move the pipe forward and the return of the piston to its original position, the movement of the pipe created by pumping air under pressure into the cavity bounded by the piston and the front cover of the pipe, and to return the piston to its original position raises the pressure in the cavity of the cylinder formed by the piston and the flange, the injection of air into it, creating the movement of the piston by the pressure difference in both cavities, the mass of air in the cavity formed by the front cover and the piston, left unchanged, and the cavity formed by the piston and the flange of the cylinder after the piston reaches the original position of the air release, then the cycles of movement of the pipe again to exit its front end into the pit.

In Fig.1 shows a transport device pipe and placing it in the worn pipe.

The device (Fig. 1,2,3 and 4) includes a cover 2, a piston 3, a detachable flange 4, a cylinder 5, trailer 6, the bypass valve 7, the tubes 8 and 9, the guide 10, a compressor 12, the emphasis of the trailer 15, receiver 16.

During transportation of the pipe 1 and the stacking worn-out pipe 11 is used pipelayer 13 and table 14.

The method of transportation the new pipes inside the deteriorated pipe is as follows.

On the road deteriorated pipe 11 (Fig.1), in its beginning and end, along the fluid pipe 1, dig two pits, work (rear) and the receiver (front), areas of deteriorated pipe 11 located in the pits, remove.

The new pipe 1 (Fig.2) prepare for the transportation of: seal, closing its front end by a plug 2 and attaching to the pipe cylinder 5 located therein a piston 3 connected to the piston by welding the guide 10 with the tubes 8 and 9, the cylinder with the open end is closed by the flange 4. The pipe 1 (Fig. 1) rest the front end on the table 14 and is supported by the pipe layer 13, the guide 10 (Fig.2) attached to the plate 15 of the trailer 6, and the pipes 8 and 9 are connected through the bypass valve 7 to the compressor 12 and the receiver 16 mounted on the trailer 6.

the e position in relation to the stacked pipe 1 (Fig.2), undercarriage of the trailer block to move back and leave you free to move forward.

The front end of the pipe 1 (Fig.1) using a pipe layer 13 is introduced into worn-out pipe 11, the cavity in the cylinder 5 formed by the piston 3 and the flange 4, is connected with atmosphere through the tube 8 and the bypass valve 7, the tube 9 (Fig.2) through the bypass valve 7 pump air compressor 12 and the receiver 16 in the cavity of stacked tubes formed by the piston 3 and the front cover 2, raising the pressure in the cavity to a value of P1and create this force acting on the front cover of the new pipe 1 is greater than the resistance force her to move. As a result, the tube 1 starts to move and the movement of the pipe will continue from the cavity of the cylinder 5 formed by the piston 3 and the flange 4, the air in the tube 8 through the bypass valve 7 will be displaced into the atmosphere. The mass of air in the cavity of the pipe 1 formed by the front cover and the piston, leaving a constant, i.e., air is pumped into the cavity once. When the flange 4 to the piston 3 seal cavity formed them by overlapping the tube 8 by-pass valve 7. The remaining air in the portion of this cavity begins to shrink, formed the hcpa shall continue and the pipe 1 will stop when the flange 4 rests on the piston 3 (Fig.3).

Since the movement of the pipe, the piston takes the pressure P1it still holds the trailer 6 when locked to turn back the navigation device. Therefore, when moving the tube forward under these conditions, the piston and the trailer will be fixed (Fig. 2,3).

To move the piston forward, so that he won the starting forward position relative to the floating tube, pump the air through the pipe 8 into the cavity formed by the piston 3 and the flange 4 (Fig.3). When the pressure of the air in this cavity size R2greater than R1when the pressure difference P2-R1the piston creates a force that exceeds the force of resistance to movement of the piston with a trailer, the piston together with the trailer will move forward along the pipe, to the position at which the stop 15 is limited by the flange 4 (Fig.4).

Movement of the pipe when it is not, as the resistance to its movement will be many times greater than the resistance to movement of the piston with a trailer.

The piston 3 will take this forward position relative to the pipe 1 (Fig.4), is the same as shown in Fig.2 position to start a new the moving pipe, repeating it many times before its front end in a pit, the air release from the pipe, the front cover and the cylinder with the piston and the flange is removed, and the tube front and rear ends attached through transitional pipe from the main functional pipe, ditches free from equipment and buried.

Consider the forces acting on the parts of the device, and the conditions that determine the movement of the tube and piston with a trailer.

For example, moving the pipe length l of 1000 m, the internal diameter of the pipe D 1,2 m, weight per unit length of the pipe G1500 kgf/m, when the guide diameter d of 0.2 m and a given coefficient of sliding friction-loaded surface floating pipe fCR0,05.

Resistance force to movement of pipe

Qc=fCRG1l=0,055001000=25000 kgf

As the driving force equal to the force of resistance at constant speed movement of the pipe, i.e., Qd=Qwithhence the necessary air pressure to move tube

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i.e., R12,21 kgf/cm2when R2=0.

Here it should be borne in mind that the reference pressure is from atmospheric taken as zero.

The power of Qc= 25000 kgf will be in the back.

From this condition we find the weight of the trailer

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HereSP=05 - coefficient-of-friction bearing part of the suspension device with the ground, on which is located the trailer.

The pressure in the cavity of the tube between the piston and the flange on the condition of the piston and trailer

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The calculation results show that the proposed method of transportation pipes should very low air pressure, which provides movement of the tubes of great length, when the low power of the compressor motor without the use of any means of transporting.

Small engine compressor is determined by the fact that the receiver is filled with air under pressure for a long time - long before pipe laying and during transportation of the pipe support pressure P2the compressor and the receiver in the cavity formed by the piston 3 and the flange 4.

The method of conveying pipe, which consists in the fact that the new pipe choke and move cyclically within the deteriorated pipe, which serves the working agent under pressure on opposite sides of the piston placed in the cylinder, with respectively perform one move the pipe forward and the return of the piston in the original pennou the piston and the front cover of the pipe, and to return the piston to its original position raises the pressure in the cavity of the cylinder formed by the piston and the flange, the injection of air into it, creating the movement of the piston by the pressure difference in both the cavity and from the cavity formed by the piston and the flange of the cylinder after the piston reaches the original position of the air release, then the cycles of movement of the pipe again to exit its front end into the pit.

 

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