Oil and gas well repair unit and method for running coil tubing in and out by means of this unit

FIELD: chemistry.

SUBSTANCE: group of inventions is related to oil industry and intended for workover, geophysical and thermal and hydrodynamic surveys of oil, gas and other wells using coil tubing and for well intervention. The unit (Fig. 1) includes a transportation basis 1 with two outriggers 12, the operator's cabin with control system 9, a drum 2 with drive 4, coil tubing 3, a winder 10 for winding of coil tubing to the drum, an injector with jigging blocks 5 with a guider 11 installed before it, the injector drive 6, sealing and BOP equipment 7 connected to the well Christmas tree 8 and a logging module 14, at that the drum drive is a power drive unit, the guider is made as a roll, coil tubing (Fig. 2) is a polymer-coated steel tubing; at the unit there is an installed pump 13 and a speed sensor measuring speed of the tubing feed to the well, two delivery force sensors and a metre measuring length of the tubing in the well, at that the above sensors, a temperature sensor and a well-pressure gage, the third delivery force sensor, a gamma-activity indicator, an accelerometer, a collar locator and the metre measuring length of the tubing in the well are connected to the control system, at that the logging module includes a temperature sensor and a well-pressure gage, a collar locator, a gamma-activity indicator, an accelerometer and the third delivery force sensor.

EFFECT: provision of workover, geophysical and thermal and hydrodynamic surveys of oil, gas and other wells.

5 cl, 1 ex, 2 dwg

The group of inventions relates to the field of the oil industry and is designed for underground repair, geophysical and thermohydrodynamic surveys of oil, gas and other vertical wells, deviated wells, and wells with horizontal sections of the profile using a flexible tube and to perform downhole operations - washing, removing hydrate and paraffin removal, perforation and other works.

In modern technique known lifting device for servicing oil wells containing vehicle with guide beams, a drum with a continuous steel pipe, the feed mechanism (this mechanism is called the injector wellhead feeder, conveyor or feeder) arranged in pairs four hydraulic racks, of which opposite to the well pair of hydraulic struts rigidly connected with the base of the feeder and are equipped with rollers for nomination for directing the beams into position, and the node of the extension mechanism in operating position. To improve performance by accelerating and simplifying the installation and alignment of the feed mechanism at the well and expanding technological opportunities facing the borehole pair of hydraulic struts connected with the base of the feed mechanism is articulated, and opposite to the well pair of hydraulic struts provided with support pads for placement of the rollers, the node extension mechanism in working position is made in the form of two hydraulic cylinders and cables with rocker rollers, and the ends of the rope are connected with the supporting pads of hydraulic props, and the middle of the rope with the feed mechanism through the hydraulic cylinder, the drum is made in the form of two concentric shells, the outer holes and the inner forming an annular cavity to feed her heated air (SU 1439197 A1, E21B 19/22, E21B 19/00, 23.11.1988).

The disadvantage of this design is the low durability of a continuous steel pipe, due to the two-cycle bending pipe during its descent and retrieval from the well. The first cycle of bending pipe occurs when the winding drum - pipe from the bent position straightens. The second cycle of the bend is at the entrance to the injector, where the pipe from a straight re-form curves, before to be placed in the injector. In addition, the relative position of the operator's cab, drum and injector eliminates simultaneous control over their functioning.

The closest analogue is the unit underground repair of wells using a flexible steel tube containing transport base frame which is equipped cabin in the management, transmission, a drum for winding the flexible tube, injector providing the forced displacement of the flexible pipe, the transfer mechanisms of the injector and the cab in the operating position, the sealer mouth. The axis of rotation of the drum for winding flexible pipe parallel to the axis of the transport base, which in the working position of the unit passes through the axis of the borehole (EN 2154146 C2, E21B 19/22, 10.08.2000).

The disadvantages of this unit are the fragility of the flexible pipe, the complexity and high cost of construction. Use the steel pipe has a number of negative consequences. When passing through the injector, and when the winding drum steel pipe exposed to irreversible plastic deformation, when diving into the well under high pressure in contact with oxygen it is exposed to accelerated corrosion due to high fatigue under cyclic stresses flexible pipe is subjected to cracks, breaks down quickly and eventually becomes unusable.

The use of steel pipe also makes it difficult to design due to the additional introduction into it of the sending device in the form of an arc in front of the entrance pipe to the injector. The use of this device it is necessary to increase the radius of the bend steel pipe and thereby reduce the deformation of the steel and to increase its lifetime.

the since steel is a heavy material, so we are forced to use expensive injectors increased power.

The disadvantages of the prototype is the uneven distribution of load on a flexible pipe run-time tripping operation, due to the fact that the main traction component design is the injector, and the drum is intended only for winding pipes and storage. In this case, when lifting and lowering the pipe into the well to a greater depth on the pipe section located below the injector, the force of tension, which is significantly greater than the portion of the tube between the drum and the injector. This leads to accelerated destruction of the pipe, and forced to use expensive injectors high power.

The objective of the proposed group of inventions is to simplify and cheapen the construction, increase the service life of the flexible pipe.

This problem is solved due to the fact that the unit for repair oil and gas wells contains a transport base with two outriggers located at the rear of the transport base, the operator cabin management system, placed in front of the transport base, drum drive, located in the middle part of the transport base, flexible pipe, stacker flexible pipe on the drum, injector with a pressure pad in front of the entrance with a guiding device, when the od of the injector, sealing and protivovirusnoe equipment, which is connected with a fountain valve bore mounted over the mouth of the well, and logging technology module mounted on the lower end of the flexible tube and having a conduit connection with the control system, the drive of the drum is made of force, a guiding device is a roller, a flexible pipe is stereoliner the tube on the pump unit is installed to supply the pulsating pressure in the cavity, and the sensor measuring the speed of the feed pipe into the well, two sensor efforts of its filing, one of which is mounted on the stacker, and the other on the injector, and measuring the length of the pipe in the well, and the aforementioned sensors, temperature sensor and pressure sensor in the well, the third force sensor supply pipe, an indicator of gamma activity, accelerometer, locator and meter length of pipe in the well is connected to the control system, while logging-the process module includes a temperature sensor and a pressure sensor in the borehole, the locator indicator of gamma activity, accelerometer, and the third force sensor supply pipe.

Telepayment pipe may consist of a tube body made of a thermoplastic polymer, such as polyethylene, polypropylene, polystyrene, polycarbonate, poly is Inishmore and so forth, transverse reinforcement made of steel tape of rectangular cross section, arranged at an angle of 45 to 60 degrees to the pipe axis, and the longitudinal reinforcement made of steel wire.

A way of lowering and lifting the flexible pipe through unit for repair oil and gas wells includes its flow into the well through the injector, further immersing the pipe in the hole under its own weight, lifting the pipes and uniform winding it on the drum with the stacker, while the supply pipe into the borehole drum works in the brake mode, after the start of the immersion pipe in the hole under its own weight the injector and the drum simultaneously operate in the braking mode, the process is controlled by installed on the unit of measurement sensor speed sensor supply pipe into the borehole, the two sensors of the efforts of its filing one of which is mounted on the stacker, and the other on the injector, and measuring the length of the pipe in the borehole, providing by comparing their readings with the readings of the sensors logging-process module that is installed on the lower end of the pipe, monitoring the progress of the pipe end and the discovery of her forced stops when promoting, at the same time to overcome the forced stops in the cavity of the pipe using a pump pulsating pressure, with subsequent lifting of the pipe is violence lifting is distributed between the injector and the drum, moreover, the winding force created by the drum, is set by the algorithm, including the computation of the control system in the effort required to lift the pipe from the well, setting the drive drum for each layer of the pipe on the drum traction, excluding the crushing of the pipe, and the above-mentioned force is controlled with the set on the stacker of the force sensor so that if traction has reached the permissible maximum, the sensor sends a signal to the control system, which, in turn, sends a signal to the drive drum to reduce the effort, while the force actuator of the injector is ensured by the fact that the control system subtracts the desired total pulling the forces generated by the drive drum, and sends the received signal to the actuator of the injector at the outlet end of the pipe from the well to prevent the throwing under the action of the wellhead pressure at the outlet of the well establish sealing and protivovirusnoe equipment and, in addition, when removing the pipe will hold the injector. For each phase of the descent or ascent of the pipe in the well control system can set the contact force pads injector to a flexible pipe, providing between the pipe and blocks the force of static friction sufficient to facilitate movement of the pipe instead of the e blocks and precluding slippage of the pipe.

The technical result is the replacement of the sending device in the form of an arc roller, replacement of a powerful low-power injector, reducing the fatigue of the pipe and its deformation under the effect of cyclic stresses, reducing wear of the injector and the exclusion of corrosion processes on the surface of the pipe.

Due to the fact that the flexible pipe made of thermoplastic polymer and steel, it is cheaper, significantly less susceptible to irreversible plastic deformation, when diving into the well under high pressure in contact with oxygen is not subjected to accelerated corrosion and is less than that of steel pipes, fatigue when exposed to cyclic stresses.

Use telepriser.no pipe creates the opportunity to simplify the design, replacing the guiding device in the form of an arc of the roller, and also allows the use of less powerful injectors.

The use of a drum equipped with a power drive, which during the lifting operations along with the injector takes the brunt of the workload, also allows the use of cheap low-power injector and excludes accelerated destruction of flexible pipes due to uneven distribution of the load on it during operations.

The regulation control system of the efforts of the pressing pressure pads injector to the guy who Koy pipe depending on the efforts of the supply or braking effort of the injector optimum loading of parts and components of the injector and, consequently, reduces its wear.

Figure 1 shows a diagram of the unit for repair oil and gas wells, and figure 2 shows a flexible telepayment pipe.

The unit is arranged as follows. In front of the transport base 1 resting on the ground with two outriggers 12, located at the rear of the transport base, placed the cabin of the operator with the control system 9, and installed in the middle of the drum 2 with the actuator 4. For smooth styling flexible telepriser.no pipe 3, at the lower end of which is mounted a logging-the process module 14 on the drum with the winding serves as the stacker 10. For supplying pressure into the flexible pipe is used, the pump 13.

At the rear of the unit is a roller 11, which is intended for guiding a flexible pipe before entering the injector (estuarine feeder) 5 with the actuator 6. Below the injector is sealing and protivovirusnoe equipment 7, which is connected with a fountain valve bore 8, is placed over the mouth of the well.

Wellhead equipment is a set of devices mounted on the wellhead for sealing, suspension lift pipes used for lifting formation fluids - oil, gas, water, on the surface during the development, flowing and gas-lift well operation and flow control wells.

In addition to the shown on the drawing elements in the pipe body can be embedded electrical cables. In this case, the tube called the umbilical.

The unit can operate in two modes - lowering and lifting of the flexible pipe. The mode is specified in the operator's cabin with the control system 9. The descent of the flexible pipe in the well is as follows. The supply of flexible pipes in the well, including the well with a wellhead pressure, by using the injector 5, the drum 2 is in the brake mode and thereby provides feed pipe to the injector pretension.

When in the future the pipe goes deep enough to dive into the well under its own weight, and sector and the drum starts to work synchronously in the brake mode. This process is controlled due to the fact that the unit is installed, the sensor measuring the speed of the feed pipe into the well, two sensor efforts of its filing, one of which is mounted on the stacker, and the other on the injector, and measuring the length of the pipe in the borehole (not shown), providing by comparing their readings with the readings of the sensors logging-the process module control advancement of the pipe end and the detection of forced stops pipe when driving, due to:

- friction forces that occur in places of curvature of the borehole;

- overcoming paraffin or asphaltene tubes, available in the well.

To overcome the places of forced stops using the pump 13 into the cavity pipes pulsating pressure.

At the end of the pipe is set logging-the process module 14 with the following elements:

- temperature sensors and pressure in the well, eliminating the use of pipes in conditions exceeding the maximum value of temperature and pressure;

- locator, designed to track the movement of the end of the pipe in the well and accurately set it at the desired depth by positioning the coupling and locking of joints;

indication of gamma activity that is bound to the end of the pipe to the borehole section is;

- accelerometer controlling the acceleration of the movement of the end of the pipe in the wellbore, including in places of curvature of the wellbore and the horizontal portion thereof;

sensor effort controlling the feed force of the pipe end during its descent and its tension if end-of-pipe placed the cargo.

The subsequent rise of the flexible pipe from the well is as follows. The lifting force is distributed between the injector 5 and the drum 2, and the winding force created by the drum, is provided according to the algorithm winding that is specified by a control system located in the operator's cab 9, excluding the crushing of the pipe at different layers, and the force created by the injector, takes such a value that the sum of the efforts of the reel and the injector was sufficient to provide for the extraction pipe from the well.

The algorithm winding and pulling force generated when the motor drives the drum and the injector, are defined as follows. At the beginning of the control system calculates the amount of force required to lift the pipe from the well. For each layer of the pipe on the dryer control system sets the drive drum corresponding traction force, excluding the crushing of the pipe, and the above-mentioned force is controlled by a force sensor mounted on the stacker. If traction until the reached the maximum allowable value, the sensor sends a signal to the control system, which, in turn, sends a signal to the drive drum to reduce effort. Then the control system subtracts the required total of the efforts of the forces generated by the drive drum, and sends the received signal to the actuator of the injector.

To exclude a waste pipe under the action of the wellhead pressure when removing pipe from a well, a well established and sealing protivovirusnoe equipment 7 and, in addition, when removing the pipe will hold the injector.

The control system provides for the regulation of the efforts of the pressing pressure pads injector to the flexible tube depending on the efforts of the supply or braking effort of the injector than the optimum loading of parts and components of the injector and increase its durability.

This is achieved as follows. For each phase of the descent or ascent of the pipe in the well control system is set to such a value the efforts of N_Fthe contact pads of the injector to a flexible pipe, between the pipe and pads were provided with some reserve static friction force," sufficient to provide for the movement of the pipe along with the pads, and there was no slippage of the pipe. This value is automatically calculated by the system control according to the following formula

$$N_{FtIg\mathrm{and}}=\left({\displaystyle \underset{O}{\overset{n}{\int }}d{F}_{tIg\mathrm{and}}}/K_{tp}\right)\cdot \mathrm{1,25,}$$

where: F_thrust- pull the injector;

To_Tr- the coefficient of friction thermoplastic polymer on steel pads;

O<n<max; max - maximum traction injector (in the case when the tube is completely submerged in the well);

1,25 - factor.

Uniform winding of the pipe on the drum provides the stacker 10.

1. The unit for repair oil and gas wells containing transport base with two outriggers located at the rear of the transport base, the operator cabin management system, placed in front of the transport base, drum drive, located in the middle part of the transport base, flexible pipe, stacker flexible pipe on the drum, injector with a pressure pad in front of the entrance with a guiding device, the drive of the injector, sealing and protivovirusnoe equipment, which is connected with the fountain fittings wells installed over the mouth is quaini, and logging technology module mounted on the lower end of the flexible tube and having a conduit connection with the control system, characterized in that the drive of the drum is made of force, a guiding device is a roller, a flexible pipe is stereoliner the tube on the pump unit is installed to supply the pulsating pressure in the cavity, and the sensor measuring the speed of the feed pipe into the well, two sensor efforts of its filing, one of which is mounted on the stacker, and the other on the injector, and measuring the length of the pipe in the well, and the aforementioned sensors, temperature sensor and pressure sensor well, the third force sensor supply pipe, an indicator of gamma activity, accelerometer, locator and meter length of pipe in the well is connected to the control system, while logging-the process module includes a temperature sensor and a pressure sensor in the borehole, the locator indicator of gamma activity, accelerometer, and the third force sensor supply pipe.

2. The Assembly according to claim 1, characterized in that telepayment pipe consists of a pipe body made of a thermoplastic polymer with transverse reinforcement made of steel tape of rectangular cross section, arranged at an angle of 45-60 degrees to the pipe axis, and the longitudinal reinforcement made article is through the wire.

3. The Assembly according to claim 2, characterized in that the body telepriser.no pipes made of polyethylene.

4. A way of lowering and lifting the flexible pipe through unit for repair oil and gas wells, including its filing in the borehole using the injector, further immersing the pipe in the hole under its own weight, lifting the pipes and winding it on the drum using a stacker, wherein when the supply pipe into the borehole drum works in the brake mode, after the start of the immersion pipe in the hole under its own weight the injector and the drum simultaneously operate in the braking mode, the process is controlled by the measurement sensor speed sensor supply pipe into the borehole, the two sensors of the efforts of its filing, one of which is mounted on the stacker, and the other on the injector, and measuring the length of the pipe in the borehole, providing by comparing their readings with the readings of the sensors logging-process module that is installed on the lower end of the pipe, monitoring the progress of the pipe end and the discovery of her forced stops when promoting, at the same time to overcome the forced stops in the cavity of the pipe using a pump pulsating pressure, with a subsequent rise pipe lifting torque is distributed between the injector and the drum, and the winding force created by the drum set is its consequences algorithm, including the calculation of the control system in the effort required to lift the pipe from the well, setting the drive drum for each layer of the pipe on the drum traction, excluding the crushing of the pipe, and the above-mentioned force is controlled with the set on the stacker of the force sensor so that if traction has reached the permissible maximum, the sensor sends a signal to the control system, which, in turn, sends a signal to the drive drum to reduce the effort, while the force actuator of the injector is ensured by the fact that the control system subtracts the desired total tractive effort of the forces generated by the drive of the drum, and to send the received signal to the actuator of the injector at the outlet end of the pipe from the well to prevent the throwing under the action of the wellhead pressure at the outlet of the well establish sealing and protivovirusnoe equipment and, in addition, when removing the pipe will hold the injector.

5. The method according to claim 4, characterized in that for each phase of the descent or ascent of the pipe in the well control system set contact force pads injector to a flexible pipe, providing between the pipe and blocks the force of static friction sufficient to facilitate movement of the pipe along with pads and excluding prokalyvanie the pipe.