KR101528062B1 - System and method for installing power cables supplying electric power to an eletric downhole motor for deep drilling - Google Patents

Abstract

The present invention relates to a rotary electric motor which uses an electric downhole motor and a power cable to supply electric power from a ground power supply source to the electric downhole motor, In a rotary drilling system, the power cable is installed in a drill string according to a specially designed system and method using two conical cable drums and a cable rotator System and method.
The present invention provides the effect of cost-effectively reducing the number of power connections to reduce electrical resistance and also reducing the likelihood of generating electrical shorts, while still providing a more reliable electrical connection, (EGS) to make geothermal power generation possible. By increasing the amount of power produced by pure domestic energy only, we can increase the self-sufficiency rate of our country, increase energy imports and greenhouse gas emissions It is possible to reduce the size of the system.
[Index]
Rotary drilling systems, drilling rods, drilling strings, conical large cable drums, IGES, IGES geothermal power stations, electric downhole motors, power cables, renewable energy generation, geothermal power generation

Description

TECHNICAL FIELD [0001] The present invention relates to a power cable installation system and method for supplying electric power to an electric downhole motor,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system and a method for installing a power cable for supplying electric power to an electric downhole motor for use in a deep room, A rotary drilling system using a drill pipe for supplying electric power from a ground electric power source to the electric downhole motor, the electric power cable being installed in a drill string, By installing the power cable in accordance with a specially designed system and method using two conical large cable drums and a cable rotator with a top cable support, a bottom cable support, a vertical axis and a pedestal, Reducing the electrical resistance by effectively reducing the number of power connections and reducing the possibility of electrical shorts at the power connections (EGS) to enable geothermal power generation to be carried out by conducting deep drilling as much as possible in our country through the above-mentioned effects. .

Korea has been making efforts to develop energy for a long time at the national level. However, the energy self-sufficiency rate still remains at 3%, and it is a very weak structure to rely on imports for about 97% To make matters worse, as the world's top 10 greenhouse gas emitters in accordance with the UN Convention on Climate Change, the demand for greenhouse gas reduction is rising, and the energy situation is becoming increasingly difficult. In addition, Fukushima nuclear power plant accidents caused by the earthquake in Japan are making the energy situation of our country even more difficult.

Looking at the flow of international society, it is expected that the demand for revising the long-term power supply basic plan of Korea to supply about half of electric power demand to nuclear power generation will increase. Accordingly, finding alternative energy sources that can reduce reliance on nuclear power generation is becoming an urgent task.

Of the above 3% energy self-sufficiency rate, power generation using renewable energy such as solar power and wind power accounts for only 1% of total power generation and 0.5% excluding large-scale hydroelectric power generation, It is staying in the large. The result is that the means and methods for cost-effectively generating and promoting power generation using renewable energies have not been derived.

Geothermal power generation, which uses geothermal water generated by EGS (Enhanced Geothermal Systems) as a heat source, has deep geothermal energy at any point in the territory of the Republic of Korea, and its scale is almost infinite. Has not been developed as a method of geothermal generation and has not been developed at all. Recently, in the inventions of Patent Documents 1 to 25, means and methods for making practical geothermal energy generation and geothermal power generation by utilizing the characteristics of our country have been disclosed.

Therefore, in order to solve the energy situation of Korea which is in serious trouble as mentioned above, it is necessary to develop renewable energy that is not raised to the desired level despite the long-term national efforts. It is required to create means and methods for cost-effectively promoting and promoting renewable energy generators while utilizing various renewable energies such as deep geothermal energy, which is almost infinite, and wind power.

KR Patent Application No. 10-2008-0044966, entitled " Method of producing a binary geothermal power generation using deep seawater ", filed on May 15, 2008. KR Patent Application No. 10-2008-0105167, entitled " System and method of binary geothermal power generation utilizing river zone ", filed on October 27, 2008. KR Patent Application No. 10-2008-0131009, entitled " System and method of producing geothermal energy using off-peak power ", filed on December 22, 2008. KR Patent Application No. 10-2009-0003582, entitled " System and method of creating EGS off-peak power using light load ", filed on Jan. 16, 2009. KR Patent Application No. 10-2009-0078070, entitled " System and method of constructing drilling using tower crane mast using tower crane mast ", filed on August 24, 2009. KR Patent Application No. 10-2010-0046729, entitled " System and method of creating EGS having zonal injection wells ", filed on May 19, 2010. KR Patent Application No. 10-2010-0046735, " System and method of creating EGS Group ", filed on May 19, 2010. KR Patent Application No. 10-2010-0065274, entitled " System and Method of Operating EGS Power Plant Using Compressed Air, "filed on Jul. KR Patent Application No. 10-2010-0081875, entitled " System and method of creating EGS Group using fault zone ", filed on August 24, 2010. KR Patent Application No. 10-2010-0081897, " System and method for drilling EGS well cluster ", filed on August 24, 2010. KR Patent application number: 10-2010-0111951, "System and method of constructing EGS / DSW power plant using seashore" using a shared waterfront beach, filed on Nov. 11, 2010 . KR Patent Application No. 10-2010-0132234, entitled " System and method for drilling and fracturing EGS / DSW power generation wells ", filed on December 22, 2010. KR Patent application number: 10-2011-0012722, "System and method for constructing DSW siphon wells of EGS / DSW power plant", filed on Feb. 2011. 14. KR Patent Application No. 10-2011-0025220, entitled " System and method for DSW air lift of EGS / DSW power plant ", filed on Mar. 23, 2011. KR Patent application number: 10-2011-0043822, "Application and system of method of constructing EGS · DSW power plant utilizing seaside adjacent to a coast road" Date: 2011.05.11. KR Patent Application No. 10-2011-0067156, entitled " System and method of power supply combining EGS power plant and intermittent renewable energy ", filed on July 7, 2011, entitled " . KR Patent application number: 10-2011-0102914, "System and method of power supply to a group of islands utilizing renewable energy" filed on October 10, 2011. KR Patent Application No. 10-2011-0117378, "System and method of lowering investment risk in oil and gas exploratory well by converting dry gas to EGS" , Filed on November 11, 2011. KR Patent application number: 10-2012-0000045, " System and method for constructing compressed air storage of EGS power plant ", filed on 2012.01.02. KR Patent application number: 10-2012-0017825, "A system and method for operating an EGS power plant supplying 24 hours power of an independent power system, "Filed on February 22, 2012. KR Patent Application No. 10-2012-0046151, "System and method for operating the EGS power plant supplying the peak load power of the power system" Filing date: 2012.05.02. KR Patent application number: 10-2012-0064881, "System and method for harvesting and storing compressed air by EGS power plant in geothermal power plant using IGS using wind energy" : June 18, 2012. KR Patent Application No. 10-2013-0015686, entitled " System and method for constructing towers of drilling using tower crane mast using tower crane mast ", filed on March 23, 2013. KR Patent Application No. 10-2013-0071319, entitled " System and method for lowering casings by transforming drilling derrick used tower crane mast ", filed on 2013.06 .21. 10-2013-0118358, " System and method for constructing a tower crane mast combined with coil tubing drilling, " filed on: October 31, 2013. U.S. Patent 4,690,212, "Drilling pipe for downhole drill motor ", Thermohlen, David E. September 1, 1987 US Patent 4,016,943, "Method for connecting electrical conductors for electric earth boring means ", Cullen, et al. April 12, 1977

As mentioned above, one of the means to solve the energy situation in Korea, which is in serious trouble, is to develop Geothermal Power Generation by creating EGS (Enhanced Geothermal Systems).

The above-mentioned EGS is described in detail in "Background Art" of Patent Document 1 and Document 1 (MIT Report) of Patent Document 1 in detail.

In order to expand the geothermal power generation by using the geothermal fluid produced from the EGS as a heat source, it is necessary to use a production well of several thousands of meters deep and an injection well, (EGS) by drilling and hydraulically fracturing a number of wells, such as a water tank,

The drilling cost for drilling the wells increases exponentially as the depth of drilling increases, as described in Patent Document 4. For example, the 4km drilling cost is more than double the 3km drilling cost, and the 5km drilling cost can be more than twice the 4km drilling cost. That is, the cost of drilling a 1km section from 3km to 4km underground is larger than the cost of drilling from 3km to 3km from the surface, and the cost of drilling a 1km section from 4km to 5km underground is less than the cost of drilling from the surface to 4km It can be big. The more drilling it takes, the greater the portion of the total cost of building a geothermal power plant, the greater the proportion of drilling costs.

For these reasons, various research and development projects are being developed in various parts of the world in order to develop drilling technologies that further reduce the cost of drilling the wells required for EGS formation.

In our country, geothermal energy at the same temperature is present in a deeper rock layer than the geothermal power projects that have been conducted all over the world. Therefore, in order to generate geothermal power by creating EGS in our country, we have to drill deeper so that the drilling cost is very high. The first and most important reason that we have been left without being developed at all is the fact that the drilling cost for drilling the wells necessary for constructing the EGS was very high. .

Therefore, the primary and essential task for successfully achieving geothermal power generation and improving profitability in our country is to increase the cost of drilling the wells required for the construction of EGS, It is to find ways and means to reduce drastically compared to using drilling technology.

The technologies disclosed in Patent Documents 2, 4, 5, 7, 9, 10, 11, 12, 15, 23, 24 and 25 are deeply drilled in agricultural, commercial and residential areas, (EGS) in order to make geothermal power generation possible by solving the above difficulties and performing drilling deeply more easily and at a lower cost.

The deep drilling techniques used to drill the wells required for the EGS are the most widely commercialized technologies and the best technique among the various deep drilling techniques according to the various conditions related to the deep drilling And use it.

Rotary drilling systems have been used for deep drilling so far in the world. The rotary drilling system refers to a method of rotating a bit. When the bit is rotated, the rock is pecked and changed and the drilling is carried out.

In addition to the rotary drilling system, various drilling systems have been developed or being developed. For example, there are Jet Drilling, Spallation Drilling, Laser Drilling, Plasma Drilling, and the like.

The rotary drilling system is classified into two types: (1) a method of rotating a drill string, and (2) a method of using a downhole motor without rotating a drill string . In the method of rotating the drilling string, a bit connected to a lower end of the drilling string is rotated by rotating the drilling string. In the method using the downhole motor, a downhole motor is installed at the lowermost part of the drill string without rotating the drill string, and a bit is provided at the lower end of the drill string , And the down-hall motor rotates the bit.

The drilling string (Drill String) is various pipe connected to the drilling until the bit (Bit) from the ground (地上) and bottom assembly: as saying the connecting body of the (Bottomhole Assembly BHA), drilling rods of about 10m length (Drill In a rotary drilling system using a pipe , a new drill pipe is added to and connected to the drill string as the drilling progresses deeper, so that the length of the drill string can be extended to several thousand meters. The bit connected to the lower end of the lowermost assembly BHA is rotated to drill and grind rocks.

When deep drilling is performed with the rotary drilling system using the drill pipe, when drilling depth reaches several thousand meters, several hundred drilling rods are connected to the drilling string. Therefore, if the bottom assembly (BHA) needs to be pulled out to the ground for bit replacement, etc., the hundreds of drilling rods must be disconnected and taken out of the drilled hole After completing the bit replacement, the drilling rods must be connected again and the pipe must be tripped into the borehole. This can take up to 10 hours depending on the depth. The longer the trip time, the greater the risks and associated costs that can cause various problems such as the collapse of a part of the borehole. Therefore, shortening the trip time is a very important task in deep drilling.

In order to shorten the trip time as described above, instead of separating each drill rod (about 10 m), it is usually separated into three drill bars (triple stand) (about 30 m) And is laid on a fingerboard installed on the upper part. In order to do this, a high drilling tower of 40 m or more is required. When drilling very deeply, for example, to a depth of 5,000 meters or more, the drill rods are separated and stacked in units of four quadruple stands (about 40 meters) to further shorten the trip time. A drilling tower with a height of about 10 m is required.

The method of rotating the drilling string is classified into two types: (1) a rotary table method and (2) a top drive method. The rotary table system is a system in which the drilling string is rotated by rotating a rotary table installed on an upper surface of a lower structure of a drilling rig. In the top drive system, the drilling rig And the drill string is rotated using a top drive suspended from the top.

The downhole motor used in the method using the downhole motor is largely divided into a hydraulic type and an electric type. The hydraulic downhole motor is operated by the hydraulic pressure of the drilling fluid circulating for drilling. An electric downhole motor, that is, an electric downhole motor, may be powered from the ground by a power cable or the like, or may be powered by a battery in an electric downhole motor.

Here, the case of drilling using the electric downhole motor related to the present invention will be described in more detail.

Depending on various conditions related to deep drilling, drilling using the electric downhole motor can be remarkably advantageous for drilling efficiency and drilling ratio.

However, serious problems such as electric connection failure, electric short circuit, electric resistance, and the like are involved in a system for supplying electric power from the ground to the electric downhole motor for deep drilling using the electric downhole motor .

When a power cable is installed from the ground to the electric downhole motor to supply electric power, the length of the electric power cable reaches several thousand meters. The electric power cable having the longest length is connected to the outer wall of the drill string If it is possible to attach it, the associated work will be much easier and the above difficulties can be greatly reduced, the problem being that the power cable can not be attached to the outer wall of the drilling string .

As the drilling progresses, the drilling string continues to move to the basement while continuing to add and connect a new drill pipe to the drill string. Therefore, when the power cable is attached to the outer wall of the drill string, the power cable hits the wall of the drilled hole and is damaged. For this reason, the power cable should be installed in the drilling string .

However, in a conventional drilling system in which drilling is continued while continuously connecting a drill pipe having a length of about 10 m, when the power cable is installed in the drill string, the drill rods are pushed into the borehole When working out or out of the borehole, the power cable must be disconnected every time the drilling rods are disconnected.

In order to solve the above difficulties, the technique disclosed in Patent Document 26 integrates a power supply line with the drill rod and has a specially designed power connection portion so that when the drill rods are connected, the power supply lines are automatically connected simultaneously, Some of the difficulties have been solved,

When deep drilling is performed by using the technique disclosed in Patent Document 26, when hundreds or more drilling rods are connected, the electric power connection portion reaches to several hundreds or more, and thus the electric resistance is increased so that the electric power is transmitted to the electric downhole motor Not only the amount of electric power to be supplied to the power connection parts is reduced but also the possibility of occurrence of electrical short circuit in the power connection parts is increased. Particularly, there is a possibility that the electric connection is cut off or electric short-circuit is generated in the power connection portions located in the lower section of the drilling string where the bit is rotating at a high speed while the drilling fluid is immersed in the drilling fluid .

The technique disclosed in Patent Document 27 is a technique created to solve the above-mentioned problem caused by causing the power connection part to reach several hundreds or more as described above, and a technique of rotating the drill string to a depth of 10,000 feet And drilled to a depth of 10,000 feet using a rotating drilling string to use an electric downhole motor to drill deeper than 10,000 feet, the drilling string is pulled out of the borehole An electric downhole motor is mounted on the lower end of the drilling string and a drilling string including the electric downhole motor is inserted into the drilling hole up to a depth of 5,000 feet and then power connections sent down the electric power cable comprising a 5,000-foot-long (power cable) 1 in the drilling string, the electric-down Remotely connected to the power connection portion provided on a lower end of the power cable 1 to the power connection portion provided on a top of the motor and, then, after the drilling string push the borehole in up to 10,000 feet deep, the power connection portion such as the The power cable 2 having a length of 5,000 feet provided therein is lowered into the drilling string to remotely connect the power connection unit provided at the lower end of the power cable 2 to the power connection unit provided at the upper end of the power cable 1, The electric power can be supplied to the electric downhole motor by connecting the upper end of the electric downhole motor to the ground power supply source, thereby reducing the number of electric power connection parts , thereby reducing the electric resistance, However,

When deep drilling is performed by using the technique disclosed in Patent Document 27, a poor electrical connection may be generated in the remotely connected power connection portions. In particular, in a state where the drilling fluid is locked at a high pressure, The electric connection is broken or the electric short-circuit is generated at the power connection part located in the lower section of the drilling string in which severe vibration occurs at a high speed.

Thus, it is an object of the present invention to provide a cost-effective means and method for solving the above-mentioned difficulties to make more reliable electrical connection, reduce the number of power connections to reduce electrical resistance, and also reduce the possibility of electric short- Is required.

SUMMARY OF THE INVENTION The present invention has been made in view of the above needs, and an object of the present invention is to provide an electric downhole motor and a power cable, The Rotary Drilling System uses Drill Pipes to reduce the number of power connections to reduce electrical resistance and reduce the possibility of electrical shorts at power connections, And to provide a cost effective power cable installation system and method that will ensure a secure electrical connection.

In the present invention, Geothermal Fluid produced by constructing EGS is used as a heat source, and GS / Sea water using SW (Sea Water) is used as a heat sink, (EGS / SWW Power Generation) using the Deep Sea Water (DSW) as a cold source or the EGS / SWW Power Generation (EGS / SWW Power Generation) In order to implement the pilot project to build and operate the world's first EGS / SW Power Plant or EGS / DSW Power Plant (EGS / DSW Power Plant) and to pursue follow-up projects, While exploring systems and methods and optimal sites that can be constructed and operated in an environmentally friendly manner while minimizing the construction cost and the operation cost, the electric downhole motor (electric downhole motor) In a rotary drilling system using a drill pipe which is provided with a power cable and supplies electric power from a ground electric power source to the electric downhole motor, the electric power cable is connected to a drill string ) According to a specially designed system and method using two cone-shaped cable drums and a cable rotator with a top cable support, a bottom cable support, a vertical shaft and a bracket, The present invention has been accomplished with the conclusion that the above object can be achieved.

In a rotary drilling system using a drill pipe, an electric downhole motor is used and a power cable is installed so that the electric power from the ground power source When supplying power to the down hall motor, a drill string inserted in the drilled hole is supplied from the lower end to the bit 5, the electric downhole motor 4, , Pipe joint 1 (6), pipe joint 2 (7), pipe joint 3 (8) and pipe joint 4 (9) For example, a pipe connection body 150 (10) may be additionally connected to extend a length of 4,500 m, and a plurality of electric power cables may be connected in a drilling string extending as described above. (12) to the ground To the down-hole motor 4 is supplied with power.

The length of one drill pipe is about 10 m. The pipe stand is a connection body or a bottom assembly (BHA) connecting a plurality of drill rods such as two, three, four, ), Or a connecting body that connects the lowermost assembly (BHA) and drilling rods.

In a system in which a plurality of electric power cables are connected as described above to supply electric power from a ground electric power source 12 to an electric downhole motor 4, the electric power is reduced by (1) And (2) manually connecting the power connections on the ground can achieve a much more reliable electrical connection than connecting remotely , and It is possible to reduce the possibility of generating a short circuit and reduce the electrical resistance.

For drilling strings that extend thousands of meters in length, the length of a single power cable with no power connection in between must be significantly longer than at least 100 meters to significantly reduce the number of power connections. However, if the length of the power cable is too long, it is difficult to install the power cable in the drilling string as described later.

In a conventional drilling system in which drilling is continued while continuously connecting a drill pipe of about 10 m in length to a drill string, a long (for example, 300 m) power cable installed in the drill string is grounded (Trip in) out of the borehole in succession, while continuing to connect the drill rod (about 10 m in length) while manually connecting the drill rod Implementing effectively is a difficult challenge.

The present invention solves the above problems as follows.

The power cable installation system and method of the present invention is characterized in that among the drill string and the power cable that can be extended to several thousands of meters in length as described above, the power cable 1 (1) A piping connection body 1 (6), a pipe connection body 2 (7), a pipe connection body 3 (8) and a pipe connection body 4 (9) Contrary to the case where the pipe connecting members 1 to 6 and the power cable 1 are pushed into the drilled hole 13 in the borehole 13, And a power cable installation system and method for the case of trip out. For the remaining drilling string intervals of several thousand meters, the above-mentioned drilling string interval may be repeated.

1, the power cable 1 (1) is a single power cable having only an upper end connecting portion 2 and a lower end connecting portion 3, and having no power connection in the middle, (For example, 50 m) longer than the length of the drilling string section composed of the pipe connecting body 2 (7), the pipe connecting body 3 (8), and the pipe connecting body 4 (9).

In the power cable installation system and method of the present invention, first, the following installation system is provided.

The power cable installation system of the present invention includes a conical cable drum 1 (20) having a top cable support 21, a bottom cable support 22 and a pedestal 24 as shown in Fig. 2A, Starting from the top of the cone-shaped cable drum 1 (20) while rotating the cone-shaped cable drum 1 (20) about a vertical axis 23 attached to the cone-shaped cable drum 24, starting from the bottom- The power cable 1 (1) is provided so that the power cable 1 (1) can be continuously wound around the cone-shaped cable drum 1 (20) , The conical large cable drum 1 (20) is pulled upward while being pulled up, and the conical large cable drum 1 (20) is installed around the borehole (13) To do The.

2B, the power cable installation system of the present invention includes the upper cable support 31, the lower cable support 32, the vertical cable support 31, (33) and a pedestal (34), and a conical large cable drum (30) is installed around the borehole (13).

Next, the power cable installation system of the present invention is configured so as to wind the power cable 1 (1) to the conical cable drum 1 (20) with the conical cable drum 1 (20) A cable rotator 40 having a rotating shaft 41, a rotating arm 42 and a cable loop 43 is installed as shown in FIG. 5B and the rotating arm 42 is connected to the vertical axis While rotating the power cable 1 (1) passing through the cable loop 43 along the circumference of the conical cable drum 1 (20) while rotating around a rotary shaft (41) The power cable 1 (1) can be continuously wound around the conical large cable drum 1 (20) one by one in the upper direction so that the cable rotator (40) can be installed Respectively.

In the power cable installation system and method of the present invention, after the installation system as described above is provided, the power cable 1 (1) is installed within the drilling string section in the following manner.

First, as shown in Fig. 1, an electric downhole motor 4, a pipe connecting body 1 6, a pipe connecting body 2 7, a pipe connecting body 3 8, (1) to the borehole (13), the power cable (1) is connected to the drilling string section (1) by the following method, .

First, the power cable 1 (1) wound on a normal power cable reel is loosened, and the upper end connecting portion 2 of the power cable 1 (1) is inserted into the conical cable drum 1 (1) at the top of the conical cable drum 1 (20), while rotating the conical cable drum 1 (20) after fixing it to the upper cable support 21 of the conical cable drum 20 And one continuous layer is wound in the lower direction.

The electric downhole motor 4 to which the bit 5 is connected is then pushed into the borehole 13 and the upper end of the electric downhole motor 4 is connected to the borehole 13, The lower connecting portion 3 of the power cable 1 is connected to the electric downhole motor 4 and the pipe connecting body 1 is fixed to a pipe elevator (Pipe Elevater) (15).

Then, with the cone-shaped cable drum 1 (20) stopped, the power cable 1 (1) wound on the conical cable drum 1 (20) is lifted up The upper end connecting portion 2 of the power cable 1 is inserted into the lower end of the pipe connecting body 1 6 and passed through the pipe connecting body 1 6 so that the pipe connecting body 1 6, 3B, the upper end connecting portion 2 of the power cable 1 (1) is fixed to the upper cable support 31 of the conical large cable drum 2 (30), and then the conical large- While rotating the cable drum 2 (30), the power cable 1 (1) starts from the upper end of the conical cable drum 2 (30) and is continuously wound around the lower end in one layer.

6 (B), after the pipe connection body 1 (6) is connected to the electric downhole motor 4, the pipe connection body 1 (6) provided with the electric power cable 1 The pipe connecting body 2 is inserted into the borehole 13 and the upper end of the pipe connecting body 1 is fixed to the bowl 14 of the borehole 13, .

4B, the power cable 1 (1) wound on the conical cable drum 2 (30) is lifted upwards and the upper end connecting portion 2 of the power cable 1 (1) Is inserted into the lower end of the pipe connecting body 2 (7), passed through the pipe connecting body 2 (7), pulled out to the upper end of the pipe connecting body 2 (7) The upper end connecting portion 2 of the cable 1 is fixed to the upper cable support 21 of the conical cable drum 1 20 and then the conical cable drum 1 20 is rotated while the power cable 1 (1) starting from the upper end of the conical cable drum 1 (20) and being wound one after another in succession in the lower end direction.

Subsequently, after the pipe connector 2 (7) is connected to the pipe connector 1 (6), the pipe connector 2 (7) provided with the power cable 1 (1) The pipe connecting body 3 is pushed into the borehole 13 and the upper end of the pipe connecting body 2 is fixed to the bowl 14 of the borehole 13, .

Thereafter, the power cable 1 (1) is passed through the pipe connector 1 (6) and wound around the conical cable drum 2 (30) Passes through the pipe connector 3 (8), and is wound around the conical cable drum 2 (30).

6D, after the pipe connector 3 (8) is connected to the pipe connector 2 (7), the pipe connector 3 (8) provided with the power cable 1 (1) The pipe connecting body 4 is pushed into the borehole 13 and the upper end of the pipe connecting body 3 8 is fixed to the bowl 14 of the borehole 13, .

Thereafter, the power cable 1 (1) is passed through the pipe connector 2 (7) and wound around the conical cable drum 1 (20) Passes through the pipe connector 4 (9), and is wound around the conical cable drum 1 (20).

6E, after the pipe connector 4 (9) is connected to the pipe connector 3 (8), the pipe connector 4 (9) provided with the power cable 1 (1) And the upper end of the pipe connector 4 (9) is fixed to the bowl (14) of the borehole (13).

The power cable 1 (1), the pipe connector 4 (9), the pipe connector 3 (8), the pipe connector 2 (7) and the pipe connector 1 (1) inserted into the borehole 13 through the above- The electric power cable 1 (1) installed in the drilling string section is removed from the borehole 13 by the following method when the electric downhole motor 6 and the electric downhole motor 4 are tripped out of the borehole 13, do.

As shown in FIG. 4A, when the conical-shaped cable drum 1 (20) is stopped, the power cable 1 (1) wound on the conical cable drum 1 (20) 5A, after the upper end connecting portion 2 of the power cable 1 (1) is fixed to the lower cable support 32 of the cone-shaped cable drum 2 (30), the cone-shaped cable drum 2 The power cable 1 (1) is wound around the cone-shaped cable drum 2 (30) in the upper direction in the form of a single layer continuously while rotating the cone-shaped cable drum (30).

6D, the upper end of the pipe connector 3 (8) is connected to the borehole 13 (13), and the upper end of the pipe connector 3 (8) And the pipe connecting member 4 (9) is suspended from the pipe elevator 15 after releasing the connecting portion.

Then, with the cone-shaped cable drum 2 (30) stopped, the power cable 1 (1) wound on the cone-shaped cable drum 2 (30) is lifted up The power cable 1 (1) is pushed into the pipe connecting body 4 (9) from the upper end of the pipe connecting body 4 (9), and the power cable 1 5, the power cable 1 (1) starts from the lower end of the conical cable drum 1 (20) to the upper direction while rotating the cable rotator (40) The layers are successively wrapped around each other.

Then, with the cone-shaped cable drum 1 (20) stopped, the power cable 1 (1) wound on the conical cable drum 1 (20) is lifted up 5A, the upper end connecting portion 2 of the power cable 1 (1) is fixed to the lower cable support 32 of the conical cable drum 2 (30), and then the conical cable drum 2, the power cable 1 (1) starts from the lower end of the cone-shaped cable drum 2 (30) and is wound around the upper end of the power cable 1 (1).

Next, the pipe connector 4 (9) is laid on a fingerboard, and the connection between the pipe connector 3 (8) and the pipe connector 2 (7) is pulled out to the ground, The upper end of the pipe connector 2 7 is fixed to the bowl 14 of the borehole 13 and the pipe connector 3 8 is connected to the pipe elevator 15 Hang it.

Thereafter, the power cable 1 (1) is passed through the pipe connector 4 (9) and wound around the conical cable drum 1 (20) while rotating the cable rotator 40, The power cable 1 (1) wound on the conical large cable drum 1 (20) is wound up on the conical large cable drum 2 (30) while lifting up the power cable 1 Is passed through the pipe connector (3) (8) and wound around the conical cable drum (2) (30).

Next, the pipe connecting body 3 (8) is laid on the finger board, and the connection between the pipe connecting body 2 (7) and the pipe connecting body 1 (6) is pulled out to the ground, The upper end of the pipe connector 1 6 is fixed to the bowl 14 of the borehole 13 and the pipe connector 2 7 is connected to the pipe elevator 15, .

Thereafter, the power cable 1 (1) is passed through the pipe connector 4 (9) and wound around the conical cable drum 1 (20) while rotating the cable rotator 40, The power cable 1 (1) wound on the conical large cable drum 1 (20) is wound up on the conical large cable drum 2 (30) while lifting up the power cable 1 Is passed through the pipe connector (2) (7) and wound around the conical cable drum (2) (30).

Next, the pipe connecting body 2 (7) is piled up against the finger board, and the connection between the pipe connecting body 1 (6) and the electric downhole motor 4 is pulled out to the ground, and as shown in FIG. 6A, The upper end of the electric downhole motor 4 is fixed to the bowl 14 of the borehole 13 and the pipe connection body 1 is suspended from the pipe elevator 15 after the connection is released.

Thereafter, the power cable 1 (1) is passed through the pipe connector 4 (9) and wound around the conical cable drum 1 (20) while rotating the cable rotator 40, The power cable 1 (1) wound on the conical large cable drum 1 (20) is wound up on the conical large cable drum 2 (30) while lifting up the power cable 1 Passes through the pipe connector 1 (6) and is wound around the conical cable drum 2 (30).

Then, the pipe connector 1 (6) is piled up against the finger board and the connection between the lower end connection part (3) of the electric power cable 1 (1) and the electric downhole motor (4) The downhole motor 4 is pulled out of the borehole 13.

As shown in Fig. 1, the installation system and method described above include a pipe connection body 1 (6), a pipe connection body 2 (7), a pipe connection body 3 (8) and a pipe connection body 4 < / RTI > (9) of the present invention. The execution of the remaining intervals that can reach several thousand meters can be repeated in the above-described section.

According to the above-described system and method, the present invention provides a power cable that supplies electric power to an electric downhole motor for deep-sea use, thereby reducing the number of electric connection parts by cost, And provides a more reliable electrical connection, while significantly reducing the likelihood of electrical shorting.

Accordingly, according to the present invention, through the above-mentioned effects, it is possible to perform geothermal power generation by constructing an EGS by conducting more deep drilling in the Korean soil, and in addition to the geothermal power generation, (Renewable Energy Power Generation) by utilizing intermittent Renewable Energy, etc., and increase the amount of power produced by pure domestic energy alone, thereby increasing Korea's energy self-sufficiency rate, And reduce greenhouse gas emissions.

FIG. 1 is a block diagram of a rotary drill pipe using an electric downhole motor and a power cable to supply electric power from a ground power source to the electric downhole motor. In the rotary drilling system, a drill string inserted in a drilled hole and a power cable are schematically described. A bit 5, an electric downhole motor 4, A plurality of pipe connectors in addition to the pipe connector 1 (6), the pipe connector 2 (7), the pipe connector 3 (8) and the pipe connector 4 (9) For example, the pipe connector 150 (10) may be additionally connected and extended to a length of 4,500 m, and a plurality of power cables may be installed in the drilling string extending as described above. The power cable 1 (1) is installed in a drilling string section composed of a pipe connecting body 1 (6), a pipe connecting body 2 (7), a pipe connecting body 3 (8) and a pipe connecting body 4 (9).
2A is a front view of a conical cable drum 1 20 according to the present invention in which a top cable support 21, a bottom cable support 22, a vertical shaft 23 and a vertical shaft 23 are attached (24) to rotate the conical cable drum (1) (20) around the vertical axis (23). A cable rotator 40 having a rotating shaft 41, a rotating arm 42 and a cable loop 43 is described in a front view.
2B is a front view of conical cable drum 2 30 of the present invention in which a top cable support 31, a bottom cable support 32, a vertical shaft 33 and a pedestal 34 are illustrated in front view .
3A shows a state in which the conical cable drum 1 (20) of the present invention is rotated while a power cable 1 (1) starts from the top of the conical cable drum 1 (20) This is a front view of the work of wrapping.
3B shows a state in which the cone-shaped cable drum 2 (30) of the present invention is rotated, and the power cable 1 (1) starts from the top of the conical cable drum 2 (30) This is a front view of the work of wrapping.
4A shows a power cable 1 (1) in which a conical large-diameter cable drum 1 (20) of the present invention is stationary and is continuously wound around the conical cable drum 1 (20) This is a front view of pulling up and pulling up.
Fig. 4B shows a state in which the power cable 1 (1) in which the cone-shaped cable drum 2 (30) of the present invention is stopped and the cone-shaped cable drum 2 (30) This is a front view of pulling up and pulling up.
5A shows a state in which the conical cable drum 2 (30) of the present invention is rotated while starting from the lower end of the conical cable drum 2 (30), and the power cable 1 (1) This is a front view of the work of wrapping.
5B shows a state in which the conical cable drum 1 (20) of the present invention is stopped while rotating the cable rotator 40 while starting from the lower end of the conical cable drum 1 (20) (1) is wound in a single layer in succession.
6A shows an electric downhole motor 4 in which a bit 5 is connected is pushed into a borehole 13 and the upper end of the electric downhole motor 4 is connected to a bowl 14 of the borehole 13 And then hanging the pipe connector 1 (6) to a pipe elevator (15).
6B shows a state in which the pipe connector 1 6 is pushed into the borehole 13 and the upper end of the pipe connector 1 6 is fixed to the bowl 14 of the borehole 13, 2 (7) to the pipe elevator (15).
6C shows a state in which the pipe connector 2 7 is pushed into the borehole 13 and the upper end of the pipe connector 2 7 is fixed to the bowl 14 of the borehole 13, 3 (8) to the pipe elevator (15).
6D shows a state in which the pipe connector 3 8 is pushed into the borehole 13 and the upper end of the pipe connector 3 8 is fixed to the bowl 14 of the borehole 13, 4 (9) to the pipe elevator (15).
6E schematically illustrates the operation of pushing the pipe connector 4 (9) into the borehole 13 and fixing the upper end of the pipe connector 4 (9) to the bowl (14).

The implementation of the power cable installation system and method of the present invention will be described in detail with reference to FIGS. 1 to 6 attached hereto.

Rotary drilling using a drill pipe that uses an electric downhole motor and installs a power cable to supply electric power from a ground power source to the electric downhole motor 1, a drill string inserted into a drilled hole in a system (a rotary drilling system) includes a bit 5, an electric downhole motor 4, In addition to the Pipe Stand 1 (6), the pipe connector 2 (7), the pipe connector 3 (8) and the pipe connector 4 (9) For example, a pipe connecting body 150 (10) can be additionally connected and extended to a length of 4,500 m, and a plurality of electric power cables are connected to each other in a drilling string extending as described above, Lt; RTI ID = 0.0 > 12 < / RTI & And supplies electric power to the hall motor 4. [

The lower end connecting portion 3 of the power cable 1 is connected to the electric downhole motor 4 and the upper end connecting portion 2 of the power cable 1 Is connected to the lower connecting portion of the power cable 2, the upper connecting portion of the power cable 2 is connected to the lower connecting portion of the power cable 3, and the upper connecting portion of the power cable 3 is connected to the lower connecting portion of the power cable 4 For example, a lower end connection of the power cable 20 (11), and the upper end connection of the power cable 20 (11) is connected to another power cable And is connected to a ground power source 12.

In a rotary drilling system using an electric downhole motor and installing a power cable to supply electric power from an electric power source on the ground to the electric downhole motor, a short circuit or a poor electrical connection is generated in the rotary drilling system using a drill pipe The most probable section is the lowermost section of the drilling string where the drilling fluid is immersed in the high pressure drilling fluid and the drilling string is subjected to severe vibration while the bit is rotating at a high speed.

Therefore, depending on various conditions of the deep drilling, a power cable is installed only in the lowermost section of the drill string, for example, at the lowermost section of 1,000 m, and the remaining sections are provided with a technology similar to the technology disclosed in the patent document 26, It is also possible to use special drilling rods with power supply connections that connect the supply lines to the drill pipe and automatically connect the power supply lines when the drill bars are connected.

In the rotary drilling system using the electric downhole motor and the drill pipe as described above, after the start of drilling, a series of special methods are repeated, and while the length of the drilling string is extended to several thousand meters or more, .

The power cable installation system and method of the present invention also extends the drilling string and power cable several thousand meters in length, while repeating a series of special construction methods.

Therefore, in order to create a series of special works to be repeatedly carried out as above, the power cable installation system and method of the present invention is characterized in that the drill string and the power cable, which can be extended to a length of several thousand meters, The pipe connecting body 1 (6), the pipe connecting body 2 (7), the pipe connecting body 3 (8), and the pipe connecting body 4 (9) in which the power cable 1 And the drilling string section is selected.

1, the power cable 1 (1) is a single power cable having only an upper end connecting portion 2 and a lower end connecting portion 3, and having no power connection in the middle, (For example, 50 m) longer than the length of the drilling string section composed of the pipe connecting body 2 (7), the pipe connecting body 3 (8), and the pipe connecting body 4 (9).

Next, the power cable installation system and method of the present invention is characterized in that the pipe connection members 1 (6) to 4 (9) and the power cable 1 (1) are connected to a drilled hole 13 The power cable installation system and method for the case of performing a trip out operation to the outside of the borehole 13 as opposed to a trip in operation. For the remaining drilling string intervals of several thousand meters, the above-mentioned drilling string interval may be repeated.

1. Power cable installation system

The power cable installation system and method according to the present invention are installed with the following installation system.

(1) The conical cable drum 1 (20) is installed.

The power cable installation system of the present invention is characterized in that the power cable 1 (1) is connected to the conical cable drum 1 (20) continuously by rotating the conical cable drum 1 (20) A lower cable support 22 and a pedestal 24 are provided on the conical cable drum 1 20 and a vertical shaft 23 attached to the pedestal 24 is provided on the conical cable drum 1, 3A, the cone-shaped cable drum 1 (20) is rotated around the cone-shaped cable drum 1 (20), starting from the top of the cone-shaped cable drum 1 (20), starting from the bottom- The power cable 1 (1) is provided so that the cable 1 (1) can be continuously wound around the cone-shaped cable drum 1 (20) Cone Large The cable drum 1 20 is pulled upward while being pulled up as shown in FIG. 4A in a state where the cable drum 1 is stopped, and the conical large cable drum 1 (20) is formed around the borehole 13, .

The reason for using cone-shaped cable drums is as follows: (1) Starting from the top of the conical cable drum and continuously winding the power cable in one layer in the downward direction, the conical cable drum is stopped, (2) The power cable is continuously wound around the power cable in the upper direction starting from the lower end of the cone-shaped cable drum, and the power cable is continuously wound around the power cable in the upper direction In the state where the conical large-diameter cable drum is stopped, the power cable wound up as described above can be pulled upward while being pulled up. (3) In the state where the conical cable drum is stopped, While rotating the rotor 40, the power cable is connected to the lower end of the conical cable drum So that it can be wrapped around one by one in the upper direction.

In the above process, the power cable starts winding from the lower end of the conical cable drum to the upper end and is wound in one layer continuously. However, the power cable is partially wound on the wound power cable or some irregularly wound Even if this occurs, since the cable is wound around the cone-shaped cable drum, there is no problem in the subsequent operation, that is, pulling up the power cable while pulling it upward.

The reason why the top cable support 21 is installed in the conical large cable drum 1 20 is that, as shown in FIG. 3A, the conical cable drum 1 (20) So that the cable 1 (1) can not be pushed up out of the upper end of the conical cable drum 1 (20).

The reason why the lower cable support 22 is provided on the conical cable drum 1 20 is that as shown in FIG. 4A, the conical cable drum 1 (20) So that the power cable 1 (1) can not be pushed out of the lower end of the conical cable drum 1 (20).

The cone-shaped cable drum 1 (20) may be made of wood, metal, plastic or the like, and may be manufactured from the top of the cone-shaped cable drum 1 (20) The power cable 1 (1) is wound around the cone-shaped cable drum 1 (20) in the same direction, and the power cable 1 (1) Pulling up while lifting up the conical cable drum 1 with the conical cable drum 1 stopped and rotating the cable rotator 40 while the conical cable drum is still stopped, Strength, length, etc. of the electric power cable 1 (1) so as to smoothly carry out the operation of winding the electric power cable 1 (E.g., 3 m) of the conical large cable drum 1 20, an angle (e.g., 60 degrees) formed by the slope of the conical cable drum 1 20 and the horizontal plane (e.g., 60 degrees) Determines the rotation speed of the cable drum 1 (20).

(2) The conical cable drum 2 (30) is installed.

2B, the power cable installation system of the present invention includes the upper cable support 31, the lower cable support 32, the vertical cable support 31, (33) and a pedestal (34), and a conical large cable drum (2) (30) is installed around the borehole (13).

3B, while rotating the cone-shaped cable drum 2 (30) around a vertical axis 33 attached to the pedestal 34, the cone-shaped cable drum 2 (30) 5A, the power cable 1 (1) can be continuously wound around the cone-shaped cable drum 2 (30) one by one in a direction from the lower end to the upper end, As shown in Fig. 4B, the power cable 1 (1) in which the cone-shaped cable drum 2 (30) is continuously wound in a single layer is pulled up and loosened And the conical large cable drum 2 (30) is installed around the borehole (13).

Regarding the production of the conical large cable drum 1 (20), the conical cable drum 2 (30) is manufactured by referring to the matters described in the above (1).

(3) a cable rotating machine 40 is installed.

Next, the power cable installation system of the present invention starts from the lower end of the conical cable drum 1 (20) in the state of stopping the conical cable drum 1 (20) A cable rotator 40 is installed on the conical cable drum 1 20 as shown in FIG. 2A, and the cable rotator 40 is provided with a rotary shaft 41 A rotating arm 42 and a cable loop 43. The rotating arm 42 is rotated around a rotation axis 41 which is concentric with the vertical axis 23 so as to rotate the cable loop 43 The power cable 1 (1) is passed through the conical cable drum 1 (20), as shown in Figure 5B, while the penetrating power cable 1 (1) is rotated along the circumference of the conical cable drum 1 Starting from the bottom and continuously in one fold in the upper direction And having to be placed song chagok wound, and installing the cable rotator (Rotator Cable) (40).

The specifications of the conical cable drum 1 20 and the power cable 1 1 are carefully analyzed so that the rotational speed of the cable rotator 40 and the rotational speed of the rotating arm 42 Determine the length.

Since the rotating arm 42 may be an obstacle when pulling up the power cable 1 (1) wound on the conical cable drum 1 (20) by pulling it upwards, the rotating arm 42) shall be installed in a structure that can be removed except during operation.

The power cable installation system and method of the present invention, after having the installation system as described above, is provided with a pipe connection body 1 (6), a pipe connection body 2 (7), a pipe connection The power cable 1 (1) is installed in a drill string section composed of the body 3 (8) and the pipe connector 4 (9), or the power cable 1 (1) installed in the drill string section is removed do.

2. How to install power cable

(1) How to install the power cable when performing a trip in operation

The drilling string section composed of the electric downhole motor 4, the pipe connecting body 1 (6) to the pipe connecting body 4 (9) connected with the bit 5 as shown in Fig. 1 and the power cable 1 In the case of performing a trip in operation into the borehole 13, the power cable 1 (1) is installed in the drilling string section in the following manner.

(1-1) Starting from the top of the conical cable drum 1 (20), the power cable 1 (1) is continuously wound around the power cable 1 in a downward direction.

First, as shown in FIG. 3A, while the power cable 1 (1) wound on a normal power cable reel (Reel) is loosened to perform a trip in operation, the power cable 1 The upper connecting portion 2 is fixed to the upper cable support 21 of the conical large cable drum 1 20 and then the power cable 1 Beginning from the upper end of the large cable drum 1 (20), the bundle is continuously wound in a single layer in the lower direction.

Cable pullers are used for pulling or pushing the power cable 1 (1) during the above operation. The cable feeder is a widely used device in the related industry to insert a power cable between rollers and to pull or push the power cable while rotating the rollers.

(1-2) The electric downhole motor 4 is pushed into the borehole 13 and the pipe connector 1 (6) is hung on the pipe elevator 15.

6A, an electric downhole motor 4 to which the bit 5 is connected is pushed into the borehole 13 and the upper end of the electric downhole motor 4 is connected to the borehole 13, The lower connecting portion 3 of the power cable 1 is connected to the electric downhole motor 4 and the pipe connecting body 1 is fixed to a pipe elevator (Pipe Elevater) (15).

(1-3) Install the power cable 1 (1) into the pipe connector 1 (6) and push it into the borehole (13).

Then, as shown in FIG. 4A, the cone-shaped cable drum 1 (20) is stopped and the power cable 1 (1) is wound around the cone-shaped cable drum 1 The upper end connecting portion 2 of the power cable 1 is inserted into the lower end of the pipe connecting body 1 6 and passed through the pipe connecting body 1 6, The upper end connecting portion 2 of the power cable 1 is connected to the upper cable support 31 of the conical cable drum 2 30 by pulling it to the upper end of the pipe connector 1 6, The cone-shaped cable drum 2 (30) is rotated, and the power cable 1 (1) starts from the top of the cone-shaped cable drum 2 (30) Wrap it.

Cable pullers are used for pulling or pushing the power cable 1 (1) during the above operation.

6B, after the pipe connection body 1 (6) is connected to the electric downhole motor 4, the power cable 1 (1) is installed in the pipe connection body 1 (6) The pipe connector 1 6 is pushed into the borehole 13 and the upper end of the pipe connector 1 6 is fixed to the bowl 14 of the borehole 13, A cable anchor is provided on the inner upper end of the connecting body 1 (6), and the pipe connecting body 2 (7) is suspended from the pipe elevating machine (15).

The cable anchor is a device for fixing the power cable installed in the pipe connecting body so as not to be moved downward, and a drilling fluid injected downward into the pipe connecting body is connected to a power cable installed in the pipe connecting body When the cable anchor is not installed, the power cable can be pushed downward to be stacked at a specific portion of the pipe connection body. When the power cable is bundled, the drilled fluid can flow smoothly I will not.

Therefore, one end of the cable anchor, which can be manufactured using steel wire or wire rope, is connected to a cable band fixed to a power cable installed in the pipe connection body And the other end of the cable anchor is connected to a ring attached to an upper end of an inner wall of the pipe connecting body so that the power cable installed in the pipe connecting body is suspended from the loop, It is not pushed downward. The cable anchor may be provided for each pipe connection member, but it may be provided for each of a number of pipe connection members such as two or three depending on the specifications such as the diameter and strength of the power cable.

(1-4) Install the power cable 1 (1) into the pipe connector 2 (7) and push it into the borehole (13).

Then, as shown in FIG. 4B, the cone-shaped cable drum 2 (30) is stopped and the power cable 1 (1) is wound around the cone-shaped cable drum 2 The upper end connecting portion 2 of the power cable 1 is inserted into the lower end of the pipe connecting body 2 and passed through the pipe connecting body 2 7, The upper end connecting portion 2 of the power cable 1 is connected to the upper cable support 21 of the conical cable drum 1 20 by pulling it to the upper end of the pipe connector 2 7, The cone-shaped cable drum 1 (20) is rotated, and the power cable 1 (1) starts from the top of the cone-shaped cable drum 1 (20) Wrap it.

Cable pullers are used for pulling or pushing the power cable 1 (1) during the above operation.

Thereafter, after the pipe connector 2 (7) is connected to the pipe connector 1 (6), the power cable 1 (1) is maintained in the pipe connector 2 (7) The body 2 7 is pushed into the borehole 13 and the upper end of the pipe connector 2 7 is fixed to the bowl 14 of the borehole 13 as shown in FIG. A cable anchor is provided at the upper inside of the connecting body 2 (7), and the pipe connecting body 3 (8) is hung on the pipe elevator (15).

(1-5) Install the power cable 1 (1) in the pipe connector 3 (8) and push it into the borehole (13).

Thereafter, the power cable 1 (1) is passed through the pipe connector 1 (6) and wound around the conical cable drum 2 (30) Passes through the pipe connector 3 (8), and is wound around the conical cable drum 2 (30).

4A, the cone-shaped cable drum 1 (20) is stopped and the power cable 1 (1) is wound around the cone-shaped cable drum 1 (20) And the upper end connecting portion 2 of the power cable 1 is inserted into the lower end of the pipe connecting body 3 8 and passed through the pipe connecting body 3 8, The upper end connecting portion 2 of the power cable 1 is connected to the upper cable support 31 of the conical cable drum 2 30 as shown in Figure 3B, The cone-shaped cable drum 2 (30) is rotated, and the power cable 1 (1) is continuously wound around the cone-shaped cable drum 2 (30) Leave.

Next, after the pipe connector 3 (8) is connected to the pipe connector 2 (7), the power cable 1 (1) is maintained in the pipe connector 3 (8) The body 3 8 is pushed into the borehole 13 and the upper end of the pipe connector 3 8 is fixed to the bowl 14 of the borehole 13 as shown in FIG. A cable anchor is provided at the upper inner side of the connecting body 3 (8), and the pipe connecting body 4 (9) is suspended from the pipe elevator (15).

(1-6) Install the power cable 1 (1) into the pipe connector 4 (9) and push it into the borehole (13).

Thereafter, the power cable 1 (1) is passed through the pipe connector 2 (7) and wound around the conical cable drum 1 (20) Passes through the pipe connector 4 (9), and is wound around the conical cable drum 1 (20).

4B, the cone-shaped cable drum 2 (30) is wound around the cone-shaped cable drum 2 (30) one by one in the same manner as the cone-shaped cable drum 2 (30) The upper end connecting portion 2 of the power cable 1 is inserted into the lower end of the pipe connecting body 4 and passes through the pipe connecting body 4 and 9, The upper end connecting portion 2 of the power cable 1 is connected to the upper cable support 21 of the conical cable drum 1 20 The power cable 1 (1) is wound around the cone-shaped cable drum 1 (20) one by one in the direction of the bottom end while rotating the cone-shaped cable drum 1 (20) Leave.

Then, after the pipe connector 4 (9) is connected to the pipe connector 3 (8), the power cable 1 (1) is installed in the pipe connector 4 (9) The body 4 9 is pushed into the borehole 13 and the upper end of the pipe connector 4 9 is fixed to the bowl 14 of the borehole 13 as shown in Figure 6E, A cable anchor is provided on the inner upper end of the connector 4 (9).

(2) How to dismantle the power cable when you are working out (Trip out)

In the case where the work for ending the work of the item (1-6) is terminated and the work for the subsequent work is changed to a work for tripping out, the above-mentioned process is performed in the borehole 13 A drilling string section composed of the inserted pipe connecting body 4 (9), pipe connecting body 3 (8), pipe connecting body 2 (7), pipe connecting body 1 (6) and electric downhole motor 4, The power cable 1 (1) installed in the string section is pulled out of the borehole 13 (Trip out) in the following manner.

(2-1) Starting from the lower end of cone-shaped cable drum 2 (30), the power cable 1 (1) is continuously wound around the power cable 1 (1).

First, in order to perform a trip-out operation, the cone-shaped cable drum 1 (20) is stopped, and the cone-shaped cable drum 1 (20) The upper end connecting portion 2 of the power cable 1 (1) is connected to the lower end of the conical cable drum 2 (30) as shown in FIG. 5A while lifting up the power cable 1 The power cable 1 (1) starts from the lower end of the cone-shaped cable drum 2 (30) and is folded in the upper direction by rotating the cone-shaped cable drum 2 (30) In succession.

Cable pullers are used for pulling or pushing the power cable 1 (1) during the above operation.

In the above process, the power cable 1 (1) starts from the lower end of the conical cable drum 2 (30) and is wound in a single layer in the upper direction continuously and wound on the rolled power cable Even if some irregular winding occurs, since the cable is wound around the cone-shaped cable drum, there is no problem in the following operation, that is, pulling up the power cable while pulling it upward.

(2-2) Pull the pipe connector 4 (9) out of the borehole 13, and then remove the power cable 1 (1) installed in the pipe connector 4 (9).

Subsequently, the cable anchor provided at the inner upper end of the pipe connector 4 (9) is removed, and the connection of the pipe connector 4 (9) and the pipe connector 3 (8) is pulled out to the ground, The upper end of the pipe connecting body 3 is fixed to the bowl 14 of the borehole 13 and the pipe connecting body 4 is connected to the pipe elevator 15, .

Then, as shown in FIG. 4B, the cone-shaped cable drum 2 (30) is stopped and the power cable 1 (1) is wound around the cone-shaped cable drum 2 The power cable 1 (1) is pushed into the pipe connecting body 4 (9) from the upper end of the pipe connecting body 4 (9) 5B, while rotating the cable rotator 40, that is, when the rotating arm 42 of the cable rotator 40 is rotated by the vertical axis 23 (1) passing through a cable loop (43) at the end of the rotating arm (42) is rotated around the rotating shaft (41) which is a concentric shaft with the circumference of the conical large cable drum (1) The power cable 1 (1) is rotated in the conical shape Starting at the bottom of the cable drum (20) in succession as a layer to the top of the winding direction and place step by step.

In the above process, the power cable 1 (1) starts from the lower end of the conical cable drum 1 (20) and is wound in a single layer in the upper direction continuously, Even if some irregular winding occurs, since the cable is wound around the cone-shaped cable drum, there is no problem in the following operation, that is, pulling up the power cable while pulling it upward.

Then, as shown in FIG. 4A, the cone-shaped cable drum 1 (20) is stopped and the power cable 1 (1) is wound around the cone-shaped cable drum 1 5A, the upper end connecting portion 2 of the power cable 1 (1) is fixed to the lower cable support 32 of the cone-shaped cable drum 2 (30) , The power cable 1 (1) is continuously wound around the conical large-diameter cable drum 2 (30) one by one from the lower end of the conical cable drum 2 (30) in the upper direction while rotating the conical cable drum 2 (30).

Cable pullers are used for pulling or pushing the power cable 1 (1) during the above operation.

(2-3) After pulling the pipe connector 3 (8) out of the borehole 13, remove the power cable 1 (1) installed in the pipe connector 3 (8).

Next, the pipe connector 4 (9) is laid on a fingerboard, and the cable anchor provided at the upper end of the pipe connector 3 (8) is removed. The pipe connector 3 (8) As shown in Fig. 6C, the upper end of the pipe connecting body 2 (7) is fixed to the bowl 14 of the borehole 13 and the connecting portion is loosened The pipe connecting body 3 (8) is suspended from the pipe elevator 15.

Thereafter, the power cable 1 (1) is passed through the pipe connector 4 (9) and wound around the conical cable drum 1 (20) while rotating the cable rotator 40, The power cable 1 (1) wound on the conical large cable drum 1 (20) is wound up on the conical large cable drum 2 (30) while lifting up the power cable 1 Is passed through the pipe connector (3) (8) and wound around the conical cable drum (2) (30).

4B, the cone-shaped cable drum 2 (30) is wound around the cone-shaped cable drum 2 (30) one by one in the same manner as the cone-shaped cable drum 2 (30) The power cable 1 (1) is pushed into the pipe connecting body 3 (8) from the upper end of the pipe connecting body 3 (8) while the lower end of the pipe connecting body 3 (8) The rotating arm 42 of the cable rotating machine 40 is rotated by the vertical axis 23 while rotating the cable rotating machine 40 as shown in Figure 5B, (1) passing through a cable loop (43) at the end of the rotating arm (42) is rotated around the rotating shaft (41) which is a concentric shaft with the circumference of the conical large cable drum (1) While rotating the power cable 1 (1), the conical large cable Beginning from the lower end of the drum 1 (20), the drum 1 is continuously wound one by one in the upper direction.

Then, as shown in FIG. 4A, the cone-shaped cable drum 1 (20) is stopped and the power cable 1 (1) is wound around the cone-shaped cable drum 1 5A, the upper end connecting portion 2 of the power cable 1 (1) is fixed to the lower cable support 32 of the cone-shaped cable drum 2 (30) , The power cable 1 (1) is continuously wound around the conical large-diameter cable drum 2 (30) one by one from the lower end of the conical cable drum 2 (30) in the upper direction while rotating the conical cable drum 2 (30).

(2-4) After pulling out the pipe connecting body 2 (7) from the borehole 13, remove the power cable 1 (1) installed in the pipe connecting body 2 (7).

Then, the pipe connecting body 3 (8) is laid on the finger board, and the cable anchors installed on the inner upper end of the pipe connecting body 2 (7) are removed. 6B, the upper end of the pipe connecting body 1 is fixed to the bowl 14 of the borehole 13, and the connecting portion of the pipe connecting body 1 (6) The pipe connecting body 2 (7) is suspended from the pipe elevator 15.

Thereafter, the power cable 1 (1) is passed through the pipe connector 4 (9) and wound around the conical cable drum 1 (20) while rotating the cable rotator 40, The power cable 1 (1) wound on the conical large cable drum 1 (20) is wound up on the conical large cable drum 2 (30) while lifting up the power cable 1 Is passed through the pipe connector (2) (7) and wound around the conical cable drum (2) (30).

(2-5) After pulling out the pipe connecting body 1 (6) from the borehole 13, remove the power cable 1 (1) installed in the pipe connecting body 1 (6).

Next, the pipe connecting body 2 (7) is piled up against the finger board, the cable anchors installed on the inner upper end of the pipe connecting body 1 (6) are removed, and the pipe connecting body 1 (6) 6A, the upper end of the electric downhole motor 4 is fixed to the bowl 14 of the borehole 13 and the connection portion is released. Then, And the pipe connector 1 (6) is hung on the pipe elevator (15).

Thereafter, the power cable 1 (1) is passed through the pipe connector 4 (9) and wound around the conical cable drum 1 (20) while rotating the cable rotator 40, The power cable 1 (1) wound on the conical large cable drum 1 (20) is wound up on the conical large cable drum 2 (30) while lifting up the power cable 1 Passes through the pipe connector 1 (6) and is wound around the conical cable drum 2 (30).

If the work of ending the work of (2-6) is terminated and the subsequent work is changed to a work of trip in, the power cable 1 (1) 1, the cable rotator 40 is rotated while the conical cable drum 1 (20) is rotated from the lower end to the upper end of the conical cable drum 1 . That is, following the above operation, the power cable 1 (1) wound around the cone-shaped cable drum 1 (20) is not lifted upward and wound around the cone-shaped cable drum 2 (30). By thus completing the operation, the power cable 1 (1) is wound around the conical cable drum 1 (20) in order to perform a trip in operation (1-1) .

(2-6) The electric downhole motor 4 is pulled out of the borehole 13.

Then, the pipe connector 1 (6) is piled up against the finger board and the connection between the lower end connection part (3) of the electric power cable 1 (1) and the electric downhole motor (4) The downhole motor 4 is pulled out of the borehole 13.

The installation system and method described above can be applied to four pipe connections as shown in Figure 1, namely pipe connection 1 (6), pipe connection 2 (7), pipe connection 3 (8) A method of installing the power cable 1 (1) in a Drill String section composed of a body 4 (9) is described.

A method of installing the power cable 1 (1) in the pipe connector 3 (8) and a method of installing the power cable 1 (1) in the pipe connector 4 (9) are alternately repeated, Connect the lower end connection of the power cable 2 to the upper connection part 2 of the power cable 1 (1) after installing the remaining part of the power cable 1 (1) in the connected pipe connectors, 1 (1), the power cable 2 is installed in the pipe connecting bodies added and connected. According to the above installation method, additional power cables such as power cable 3 and power cable 4 are installed.

A rotary drilling system using an electric downhole motor and installing a power cable and using a drill pipe to supply electric power from an electric power source on the ground to the electric downhole motor, Drilling system, a section where a short circuit or a poor electrical connection is likely to occur is a state in which a bit is rotated at a high speed while being immersed in a high-pressure drilling fluid, Bottom line.

Therefore, depending on various conditions of the deep drilling, a power cable is installed only in the lowermost section of the drill string, for example, at the lowermost section of 1,000 m, and the remaining sections are provided with a technology similar to the technology disclosed in the patent document 26, It is also possible to use special drilling rods with power supply connections that connect the supply lines to the drill pipe and automatically connect the power supply lines when the drill bars are connected.

According to the above-mentioned power cable installation system and method, by installing a power cable that supplies electric power to the electric downhole motor for deep use, it is possible to cost-effectively reduce the number of power connection parts, The possibility of occurrence of electric short-circuiting is also remarkably reduced, and more reliable electrical connection is achieved.

Therefore, through the above effects, we can drill more deep drills in our country to create geothermal power generation by constructing EGS. In addition, geothermal power generation and intermittent regeneration such as wind energy Renewable Energy Power Generation by utilizing intermittent Renewable Energy, which will increase the amount of power produced by pure domestic energy only, increase Korea's energy self-sufficiency rate, increase energy import and greenhouse gas Thereby reducing emissions.

1: Power cable 1
2: upper end connection of the power cable 1
3: the lower end connection of the power cable 1
4: Electric Downhole Motor
5: a bit connected to the lower end of the electric downhole motor;
6: Pipe Stand 1
7: Pipe connector 2
8: Pipe connector 3
9: Pipe connector 4
10: pipe connector 150
11: Power Cable 20
12: Power Source
13: Drilled Hole
14: Bowl of the borehole
15: Pipe elevator
20: Cone Large Cable Drum 1
21: Upper cable support of conical cable drum 1
22: Lower cable support of conical cable drum 1
23: vertical axis which is the rotation center of the conical cable drum 1
24: the base of the conical cable drum 1
30: cone large cable drum 2
31: Upper cable support of conical cable drum 2
32: Lower cable support of conical cable drum 2
33: vertical axis which is the center of rotation of the conical cable drum 2
34: the base of the conical cable drum 2
40: Cable Rotator
41: a rotating shaft
42: a rotating arm of the cable rotating machine
43: a cable loop at the end of the rotating arm

Claims (2)

1. A power cable installation system for supplying electric power to an electric downhole motor for use in a deep room,
A power cable 1 (1) for supplying electric power to an electric downhole motor (4) inserted in the drilled hole (13);
The conical cable drum 1 20 having the upper cable support 21, the lower cable support 22 and the pedestal 24 and centering on the vertical axis 23 attached to the pedestal 24 is rotated (1) starting from the upper end of the conical large cable drum 1 (20) and starting from the lower end or the lower end, and winding the power cable 1 (1) The power cable 1 (1) in which the large-capacity cable drum 1 (20) is continuously wound in one layer and the power cable 1 (1) is pulled upward while pulling up the conical cable drum 1 A conical large cable drum 1 (20) installed around the borehole (13);
The upper cable support 31, the lower cable support 32, the vertical shaft 33 and the pedestal 34 are provided to have the same function as the conical cable drum 1 (20) Conical large cable drum 2 (30) installed; And
The rotary arm 42 includes a rotary shaft 41, a rotary arm 42 and a cable ring 43. The rotary arm 42 rotates about a rotary shaft 41 which is concentric with the vertical shaft 23, The power cable 1 (1) is started at the lower end of the conical cable drum 1 (20) while rotating the power cable 1 (1) passing through the conical cable drum 1 And a cable rotator (40) provided so as to be able to continuously roll up and down in one layer in the upper direction. The electric rotating machine according to claim 1, Cable installation system. 1. A method of installing a power cable for supplying power to an electric downhole motor,
A bit 5, an electric downhole motor 4, a pipe connector 1 (6), a pipe connector 2 (7) inserted in the drilled hole 13, When the power cable 1 is tripped into the borehole 13, a portion of the drill string consisting of the pipe connector 3 (8) and the pipe connector 4 (9)
The upper end connecting portion 2 of the power cable 1 is connected to the upper cable support 1 of the conical cable drum 1 (20) while releasing the power cable 1 (1) wound on a normal power cable reel (Reel) 21, the conical cable drum 1 (20) is rotated while the power cable 1 (1) starts from the top of the conical cable drum 1 (20) A step of wrapping around;
The electric downhole motor 4 to which the bit 5 is connected is pushed into the borehole 13 and the upper end of the electric downhole motor 4 is fixed to the bore 14 of the borehole 13 A step of connecting the lower connecting portion 3 of the power cable 1 to the electric downhole motor 4 and hanging the pipe connecting body 1 to the pipe elevator 15, ;
The power cable 1 (1) wound on the conical cable drum 1 (20) is lifted upwards while the conical cable drum 1 (20) is stopped, and the power cable 1 The upper end connecting portion 2 is inserted into the lower end of the pipe connecting body 1 6 and passed through the pipe connecting body 1 6 to be pulled out to the upper end of the pipe connecting body 1 6, (1) is fixed to the upper cable support (31) of the conical large cable drum (30), and then the conical cable drum (30) Starting from an upper end of the conical cable drum 2 (30) and continuously winding the same in a single direction in a lower direction;
After connecting the pipe connector 1 6 to the electric downhole motor 4, the pipe connector 1 6 provided with the electric power cable 1 1 is pushed into the borehole 13, Fixing the upper end of the pipe connector 1 6 to the bowl 14 of the borehole 13 and then hanging the pipe connector 2 7 to the pipe elevator 15;
The upper end connecting portion 2 of the power cable 1 is connected to the upper end of the pipe connecting body 2 (7) by pulling up the power cable 1 (1) wound on the conical cable drum 2 (30) And the upper end connecting portion 2 of the electric power cable 1 is inserted into the conical large-diameter cable drum 2 through the pipe connecting body 2, 7, 1 to the top cable support 21 of the conical cable drum 1 20 and then the power cable 1 1 is started from the top of the conical cable drum 1 20 while rotating the conical cable drum 1 20 So as to form a single continuous layer in a lower direction;
After connecting the pipe connector 2 7 to the pipe connector 1 6, the pipe connector 2 7 installed with the power cable 1 1 is pushed into the borehole 13, Fixing the upper end of the pipe connector 2 7 to the bowl 14 of the borehole 13 and then hanging the pipe connector 3 8 on the pipe elevator 15;
The power cable 1 (1) is passed through the pipe connector 1 (6) and wound around the conical cable drum 2 (30) 3 (8) and wound on the conical cable drum 2 (30);
After connecting the pipe connector 3 8 to the pipe connector 2 7, the pipe connector 3 8 provided with the power cable 1 1 is pushed into the borehole 13, Fixing the upper end of the pipe connector 3 8 to the bowl 14 of the borehole 13 and then hanging the pipe connector 4 9 to the pipe elevator 15;
The power cable 1 (1) is passed through the pipe connecting body 2 (7) and wound around the conical cable drum 1 (20) 4 (9) and wound on the conical large cable drum 1 (20);
After connecting the pipe connector 4 (9) to the pipe connector 3 (8), the pipe connector 4 (9) provided with the power cable 1 (1) is pushed into the borehole 13, Fixing the upper end of the pipe connector (9) to the bowl (14) of the borehole (13);
When the power cable 1 inserted into the borehole 13 is tripped out of the borehole 13 through the above process,
The power cable 1 (1) wound on the conical cable drum 1 (20) is lifted upwards while the conical cable drum 1 (20) is stopped, and the power cable 1 The upper connecting portion 2 is fixed to the lower cable support 32 of the conical large cable drum 2 30 and then the power cable 1 1 is rotated by the conical cable drum 2 Starting from the lower end of the large cable drum 2 (30) and continuously wrapping the cable drum (30) one by one in the upper direction;
The connecting portion of the pipe connecting body 4 and the pipe connecting body 3 is grounded so that the upper end of the pipe connecting body 3 is fixed to the bowl 14 of the borehole 13, (9) to the pipe elevator (15) after releasing the pipe connector (9);
The power cable 1 (1) wound on the conical cable drum 2 (30) is lifted upward while the conical cable drum 2 (30) is stopped, and the pipe connector 4 (9) The power cable 1 (1) is pulled out from the lower end of the pipe connector 4 (9) while pushing the power cable 1 (1) into the pipe connector 4 (9) 40), winding the power cable 1 (1) continuously from the lower end of the conical cable drum 1 (20) to the upper end in the form of a single continuous layer;
The power cable 1 (1) wound on the conical cable drum 1 (20) is lifted upwards while the conical cable drum 1 (20) is stopped, and the power cable 1 The upper connecting portion 2 is fixed to the lower cable support 32 of the conical large cable drum 2 30 and then the power cable 1 1 is rotated by the conical cable drum 2 Starting from the lower end of the large cable drum 2 (30) and continuously wrapping the cable drum (30) one by one in the upper direction;
The pipe connector 4 9 is laid on a fingerboard so that the connection between the pipe connector 3 8 and the pipe connector 2 7 is pulled out to the ground, (8) to the pipe elevator (15) after fixing the upper end of the pipe connection body (3) to the bowl (14) of the borehole (13) and releasing the connection part;
The power cable 1 (1) is passed through the pipe connector 4 (9) and wound around the conical cable drum 1 (20) while rotating the cable rotator 40, The power cable 1 (1) wound on the drum 1 (20) is wound up on the conical cable drum 2 (30) while being lifted upwards, Passing it through the body (3) (8) and winding it on the conical cable drum (2) (30);
The pipe connecting body 3 8 is laid on the finger board so that the connection between the pipe connecting body 2 7 and the pipe connecting body 1 6 is pulled out to the ground and the pipe connecting body 1 6 Fixing the upper end of the pipe connection body 2 (7) to the pipe elevator 15 after fixing the upper end of the pipe connection body 2 to the bowl 14 of the borehole 13 and releasing the connection portion;
The power cable 1 (1) is passed through the pipe connector 4 (9) and wound around the conical cable drum 1 (20) while rotating the cable rotator 40, The power cable 1 (1) wound on the drum 1 (20) is wound up on the conical cable drum 2 (30) while being lifted upwards, Passing through the body (2) (7) and wound around the conical cable drum (2) (30);
The pipe connecting body 2 7 is piled up against the finger board and the connecting portion of the pipe connecting body 1 6 and the electric downhole motor 4 is pulled out to the ground so that the upper end of the electric downhole motor 4 (6) to the pipe elevator (15) after securing the pipe to the bowl (14) of the borehole (13) and releasing the connection;
The power cable 1 (1) is passed through the pipe connector 4 (9) and wound around the conical cable drum 1 (20) while rotating the cable rotator 40, The power cable 1 (1) wound on the drum 1 (20) is wound up on the conical cable drum 2 (30) while being lifted upwards, Passing through the sieve 1 (6) and winding it on the conical cable drum 2 (30); And
After the pipe connector 1 6 is pushed up against the finger board and the lower connection 3 of the power cable 1 1 is disconnected from the electric downhole motor 4, (4) to the outside of the borehole (13). The method of claim 1, wherein the electric power is supplied to the electric downhole motor.

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