CN105243954B - Coiled tubing Electro-hydraulic drive tractor experimental provision - Google Patents

Abstract

It is an object of the invention to overcome the deficiencies in the prior art, a kind of coiled tubing Electro-hydraulic drive tractor experimental provision is provided, including fluid infusion system, simulation wellbore hole system, fluid output system and water tank, the input of the fluid infusion system, the output end of fluid output system are connected with water tank, the output end with fluid infusion system, the input of fluid output system are connected respectively at the both ends of the simulation wellbore hole system, form the fluid circulation channel of closure.It can not only simulate the trip-out of coiled tubing, tripping operation, circulation fluid cycle of higher pressure can also be provided, solve coiled tubing tractor experiment porch and be unable to the technical barriers such as the tractor comprehensive performance parameter experiment that comprehensive simulation haulage drum coiled tubing is tested under hyperbaric environment, the tractor experiment porch is set to contribute to the research and development of the downhole tools such as coiled tubing tractor closer to real pit shaft operating mode.

Description

Coiled tubing electronically controlled hydraulically driven tractor experimental device

technical field

The invention belongs to the application field of downhole operations in coiled tubing oilfields, and relates to an experimental device for coiled tubing electronically controlled hydraulically driven tractors.

Background technique

Coiled tubing drilling technology refers to a new drilling technology that uses CT as the drilling string to slide and push the bottom hole assembly for drilling. It is used in improving old oilfields, shale gas, coalbed methane and tight gas unconventional gas reservoirs. , low permeability, low production" three low oil and gas reservoirs, and other difficult-to-develop oil and gas reservoirs have outstanding advantages in development benefits, cost reduction, oil layer pollution reduction, environmental protection, etc., and have broad application prospects in China. However, due to the low CT intensity and no rotation in the borehole, serious resistance is encountered during sliding drilling, the pipe string is difficult to feed, the WOB cannot be applied, and even pipe sticking occurs, making drilling impossible, which seriously affects the CT sliding drilling technology of the borehole application and promotion. The CT drilling tractor can effectively overcome the downhole CT sliding resistance, pull the downhole CT string into or out, and provide effective drilling pressure for the drill bit, so that the CT sliding drilling can be carried out smoothly. The development of coiled tubing drilling technology is of great significance.

The downhole tractor is downhole crawler, also known as downhole crawler, downhole tractor, downhole traction robot, downhole hydraulic pressurizer, downhole drill bit thruster, etc. It is a downhole tool that can provide traction at the bottom of the well. Downhole tractors can be divided into three types according to their movement principles: roller crawling type, crawler crawling type (chain rail type) and grabbing arm telescopic sliding type (stepping type), among which the wheel type appeared first, followed by the telescopic type, and the crawler type latest. Traction crawlers can be divided into three types according to their energy sources: CT type, cable type and hybrid type. Among them, the CT tractor is connected with a CT at its tail, and the ground pumps high-pressure liquid through the CT, and the high-pressure liquid drives the internal turbine mechanism of the traction crawler to provide energy for the entire traction crawler. The cable tractor obtains energy from the ground through a cable connected to its tail. The hybrid tractor can not only be powered by pumping high-pressure liquid from the ground, but also can be driven by electric power through cables.

In the late 1990s, many foreign companies successively developed horizontal well cable tractors that can operate independently underground. After years of development, so far, representative tractor products mainly include: Sondex wheeled tractor from UK Sondex Co., Ltd., Well Tractor wheeled tractor from Denmark Welltec company, and PowerTrac Advance from Norway MaritimeWell Service (MWS) company. Wheel tractors, PowerTrac INVADER crawler tractors, MaxTRAC telescopic tractors from Schlumberger, France, SmarTract telescopic tractors from ExproGroup, UK, and Microhole Drilling Tractor, telescopic tractors from Western Well Tool, USA. Among them, the Microhole Drilling Tractor telescopic tractor from Western Well Tool Company of the United States is a CT-type tractor driven by high-pressure drilling fluid on the ground and can be used in small holes. It can maintain effective drilling fluid circulation during work; most of the other tractors are Wheeled or crawler type, with a large peripheral size, is only suitable for large-diameter wells, connected by cables or wire ropes, driven by electricity, with low traction, and cannot perform effective drilling fluid circulation during work, and is generally limited to applications in the logging industry.

But no matter what kind of tractor, as far as China is concerned, strict technical secrecy measures have been taken abroad, so that domestic research on downhole tractors is still in its infancy: since August 2002, Tarim Oilfield has passed technical cooperation In this way, the downhole tractor technology was used to explore the industrial profile logging of horizontal wells, and achieved certain results. Since then, China University of Petroleum, Harbin Institute of Technology, Southwest Petroleum Institute, Daqing Petroleum Institute, Xi'an Petroleum University and other domestic scientific research institutes have also carried out research on downhole tractors, but mainly for traction logging in large diameter boreholes. Electrically driven wheeled tractors for cables or conveying downhole tools, there are few studies on hydraulically driven downhole CT tractors, and no mature products have been put on the market.

Aiming at this situation, a coiled tubing coiled tubing tractor was designed (Gao Deli, Hou Xuejun, etc. An electronically controlled hydraulically driven coiled tubing downhole tractor. CN201210290228.X), the tractor needs to be under the condition of high-pressure drilling fluid circulation, Simulation uses high-pressure large-displacement circulating fluid to drive the tractor to pull coiled tubing to realize downhole traction operations. At present, there is no suitable drum coiled tubing traction experimental device in China, and the simulated high-pressure wellbore circulation pressure in a conventional laboratory is only 1-3MPa, which cannot meet the traction requirements. Due to the high pressure wellbore simulation experiment, the continuous traction experiment of coiled tubing cannot be realized. At the same time, the high-pressure cycle sealing problem is difficult to solve, and there is a lack of instruments and equipment for various performance tests of the tractor. Therefore, there is no simulation experiment platform that can not only simulate the traction mode of drum coiled tubing, but also realize high pressure (10-20MPa) circulation of drilling fluid, high displacement, and various instruments and equipment for performance measurement of tractor.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies of the prior art and provide an experimental device for coiled tubing electronically controlled hydraulically driven tractors, which can not only simulate the tripping and tripping operations of coiled tubing, but also provide high-pressure circulation of circulating fluid, which solves the problem of The coiled tubing tractor test platform cannot comprehensively simulate technical problems such as the comprehensive performance parameter experiment of the tractor for the traction drum coiled tubing experiment in a high-pressure environment. This experimental device can simulate the working conditions closer to the actual wellbore, which is helpful for coiled tubing traction Research and development of downhole tools such as tools.

The purpose of the present invention is achieved like this:

A coiled tubing electronically controlled hydraulic drive tractor experimental device, comprising a fluid input system, a simulated wellbore system, a fluid output system and a water storage tank, the input end of the fluid input system and the output end of the fluid output system are connected to the water storage tank The two ends of the simulated wellbore system are respectively connected to the output end of the fluid input system and the input end of the fluid output system to form a closed fluid circulation channel.

In order to realize the input of fluid from the water storage tank into the simulated wellbore system, preferably, the fluid input system includes a first drum continuous hose tank simulation device, a tractor inlet continuous hose, a wellbore inlet hose, a first return line, and an input line , high pressure pump, suction line, second return line,

The first drum continuous hose tank simulation device includes a round tubular sealed tank shell, the two ends of the sealed tank shell in the axial direction are sealed by the first sealed end cover and the second sealed end cover, and the inside of the sealed tank shell is A drum and a drive shaft are provided, the drum is fixed on the drive shaft in the circumferential direction, the drive shaft is coaxial with the sealed tank shell, and the two ends of the drive shaft are rotatably supported by the first sealing end cover and the second sealing end cover , a continuous hose is wound on the drum, and one end of the drive shaft supported on the second sealing end cap is provided with a circulating fluid channel, and one end of the circulating fluid channel passes through the drive shaft along the axial direction of the drive shaft to form a liquid inlet , the other end of the circulating fluid channel passes through the drive shaft along the radial direction of the drive shaft to form a liquid outlet, the input end of the continuous hose communicates with the liquid outlet of the circulating fluid channel, and the sealed tank shell is provided with Continuous oil flexible traction outlet, the continuous oil flexible traction outlet is extended from the traction end of the continuous hose, which is used to connect with the tractor, and the lower end of the sealed tank shell is provided with a discharge port;

The liquid inlet of the drive shaft is connected to one end of the input pipeline, the other end of the input pipeline is connected to the outlet end of the high-pressure pump, the inlet end of the high-pressure pump is connected to one end of the suction pipeline, and the other end of the suction pipeline is connected to A water storage tank, the middle section of the input pipeline is connected to one end of the second return line, the other end of the second return line is connected to the water storage tank, the discharge port is connected to one end of the first return line, and the other end of the first return line is One end is connected to the water storage tank, the pulling outlet of the continuous hose is connected to one end of the wellbore inlet hose, and one end of the wellbore inlet hose is connected to the simulated wellbore system.

In order to control each pipeline separately, preferably, valve 2 and valve 4 are arranged on the input pipeline, wherein valve 2 is adjacent to the drum continuous hose tank simulation device, and the second return pipeline is located at valve 2 and valve 4 Between, valve three is set on the second return line, valve one is set on the first return line, and a suction valve is set on the suction line.

In order to realize the fluid output simulation wellbore system back to the water storage tank, preferably, the fluid output system includes a second drum continuous hose tank simulation device, a wellbore outlet hose, a third return line, and the second drum continuous hose The structure of the tank simulator is the same as that of the first drum continuous hose tank simulator, one end of the wellbore outlet hose is connected to the simulated wellbore system, and the other end is connected to the continuous hose pulling outlet of the second drum continuous hose tank simulator , the discharge port of the second drum continuous hose tank simulator is connected to one end of the third return line, and the other end of the third return line is connected to the water storage tank.

In order to control the opening and closing of the third return line, preferably, a valve five is provided on the third return line.

In order to simulate a real wellbore, preferably, the simulated wellbore system includes a wellbore inlet hose joint, a wellbore outlet hose joint, and a sealed simulated wellbore composed of several simulated wellbore nipple connections, the wellbore inlet hose joint . The wellbore outlet hose joint is fixed at both ends of the sealed simulated wellbore, the wellbore inlet hose joint is connected with the wellbore inlet hose, and the wellbore outlet hose joint is connected with the wellbore outlet hose.

In order to more realistically simulate the actual wellbore, preferably, the simulated wellbore sub-joints of the sealed simulated wellbore are fixedly connected in a detachable manner, and the shape of each simulated wellbore sub-joint simulates the shape of the wellbore to be tested.

In order to install and fix the simulated wellbore system, preferably, a platform system is also included, the platform system includes a fixture system, a platform slide rail, and a sliding platform, the slide platform slides and guides on the platform slide rail, and the fixture system is fixed on the slide platform on, and clamp the simulated wellbore system.

In order to adjust the inclination angle of the simulated wellbore system, preferably, the platform system also includes a main lifting system and an auxiliary lifting system, the main lifting system and the auxiliary lifting system are respectively arranged at both ends of the platform slide rail in the longitudinal direction. It is used to separately control the lifting and lowering of the longitudinal ends of the platform slide rail, so as to realize the wellbore experiment of simulating any well inclination angle.

In order to automatically control the experiment of the tractor in the simulated wellbore, preferably, it also includes a data acquisition and control system, the data acquisition and control system respectively collects the data of the fluid input system, the simulated wellbore system, and the fluid output system, and sends out the data after processing The corresponding control signal realizes the experiment of the tractor in the simulated wellbore.

Owing to adopting above-mentioned technical scheme, the present invention has following beneficial effect:

1. Directly use the motor to drive the drum to realize the pre-tensioning of the coiled tubing on the drum, which reduces the cost of using the real drum for traction experiments, and avoids factors such as hose stretching and friction with the well wall during the tractor test. The impact of the test results makes the experimental results more realistic.

2. Directly simulating the circulation of the working fluid of the real coiled tubing machine, which provides the necessary conditions for driving the tractor with high-pressure circulating fluid for traction experiments, and makes up for the lack of high-pressure circulating fluid in the current tractor experiments.

3. The entire simulated traction drum and coiled tubing are sealed under high pressure directly with the shell of the high-pressure sealed tank, which provides the necessary conditions for the traction experiment of the coiled tubing tractor in the high-pressure wellbore environment, and makes up for the current high-pressure cycle driving traction experiment platform of the tractor. insufficient.

4. The continuous hose of the experimental device can simulate the coiled tubing operating machine drum circulation resistance experiment, making up for the deficiency of coiled tubing drilling circulation resistance research.

5. The experimental device can provide the necessary high-pressure circulation for any wellbore that requires high temperature, high pressure and high displacement, which expands the function of the experimental device and makes up for the lack of single function of the existing experimental device.

Description of drawings

Fig. 1 is a schematic diagram of the composition system of the present invention;

Figure 2 is a schematic diagram of the main components of the fluid input and output system;

Figure 3 is a schematic diagram of the main components of the simulated wellbore system;

Figure 4 is a schematic diagram of the main components of the platform system;

Fig. 5 is a schematic diagram of a vertical axial section of the wellbore main fixture system;

Fig. 6 is a schematic diagram of a vertical section along the axial direction of the wellbore main fixture system;

Fig. 7 is a schematic view of the vertical axial section of the wellbore auxiliary fixture system;

Fig. 8 is a schematic cross-sectional view of the wellbore auxiliary fixture system along the A-A direction;

Figure 9 is a schematic front view of the wellbore inlet multifunctional joint;

Fig. 10 is a schematic diagram of the B-B section of the wellbore inlet multifunctional joint;

Figure 11 is a schematic cross-sectional view of a roller continuous hose tank simulation device;

Fig. 12 is a schematic diagram of an axial sectional view of the sealed tank shell system;

Fig. 13 is a schematic diagram of a transverse section of the sealed tank shell system;

Fig. 14 is a schematic diagram of the overall top view of the sealed tank shell system;

Fig. 15 is a schematic diagram of the overall front view of the sealed tank shell system;

Figure 16 is a schematic front view of the coiled tubing drum winding system;

Figure 17 is a schematic front view of the mixing system.

reference sign

1. Fluid input system, 2. Simulated wellbore system, 3. Fluid output system, 4. Lifting platform system, 5. Data acquisition and control system;

1. Fluid input system, 101. First drum continuous hose tank simulation device, 102. Valve one, 104. Wellbore inlet hose, 105. Valve two, 106. First return pipeline, 107. Valve three, 108. High pressure Pipeline, 109, valve three, 110, suction inlet valve, 111, high pressure pump, 112, suction pipeline, 113, second return pipeline, 114, water storage tank, 115, water storage tank discharge pipe, 116, water storage tank discharge valve;

2. Simulated wellbore system, 21. Simulated wellbore system one, 22. Simulated wellbore system two, 23. Simulated wellbore system three;

211. Wellbore inlet hose joint, 212. Wellbore inlet multifunctional joint, 213. Simulated wellbore nipple, 214. Tractor system, 215. Tractor center slide pipe assembly, 216. Wellbore outlet multifunctional joint, 217. Wellbore Outlet hose connector;

221. Simulated convex wellbore sub, 222. Simulated gradual diameter wellbore sub, 223. Simulated stepped wellbore sub, 224. Simulated dog-leg wellbore sub, 225. Simulated fish maw large wellbore sub, 226. Simulated necking down Large wellbore pup joints, 227, simulated curved large wellbore sub joints;

231. Simulated keyway wellbore sub, 232. Simulated expanded diameter wellbore sub, 233. Simulated unilateral convex wellbore sub, 234. Simulated fast shrinking wellbore sub, 235. Simulated fish maw small wellbore sub, 236. Simulated shrinking Neck small wellbore sub, 237, simulated curved small wellbore sub;

3. Fluid output system, 301, second drum continuous hose tank simulation device, 302, tractor outlet continuous hose, 303, valve five, 304, wellbore outlet hose, 305, third return pipeline;

4. Lifting platform system, 41. Shaft main fixture system 1, 42. Main hoisting system, 43. Shaft auxiliary fixture system, 44. Platform slide rail system, 45. Sliding platform system, 46. Auxiliary lifting system, 47 , Shaft main fixture system II;

411, the upper fixed cover of the wellbore main fixture, 412, the fixed base of the wellbore main fixture;

431, the locking bolt of the wellbore auxiliary fixture, 432, the locking slips of the wellbore auxiliary fixture, 433, the fixing upper cover of the wellbore auxiliary fixture, 434, the fixing base of the wellbore auxiliary fixture;

5. Data acquisition and control system, 51. Signal acquisition and input system, 52. Signal processing control system, 53. Display system, 54. Two-way input and output control system.

61. Sealed tank shell system, 611, first sealed end cover, 612, sealed tank shell, 613, sealed cover, 614, second sealed end cover, 615, discharge port, 616, stirring shaft inlet seal, 617, Base bracket, 618, continuous oil soft traction outlet;

62. Winding coiled tubing drum system, 621. Drive motor, 622. Drive shaft seal compression cover, 623. Drive shaft, 624. Coiled tubing traction end, 625. Roller, 626. Tractor inlet continuous hose, 627, Continuous Oil pipe input end, 628, input end sealing compression cover, 629, input shaft;

63, stirring system, 631, stirring motor, 632, stirring shaft, 633, stirring impeller.

detailed description

As shown in Figure 1, it is a preferred embodiment of a continuous hose electro-hydraulic drive tractor experimental device, including a fluid input system 1, a simulated wellbore system 2, a fluid output system 3, a platform system 4, data The acquisition and control system 5 and the water storage tank 114; the input end of the fluid input system 1 and the output end of the fluid output system 3 are all connected to the water storage tank 114, and the two ends of the simulated wellbore system 2 are respectively connected to the fluid input system 1 and the input of the fluid output system 3 are connected to form a closed fluid circulation channel. The simulated wellbore system 2 is fixedly installed on the platform system 4 as a whole, and is used to realize the wellbore experiment of simulating any well inclination angle. The data acquisition and control system 5 respectively collects data from other systems, and after processing, sends corresponding control signals to realize the experiment of the tractor in the simulated wellbore.

The fluid input system 1 mainly includes the first drum continuous hose tank simulation device 101, valve one 102, wellbore inlet hose 104, valve two 105, first return pipeline 106, valve three 107, input pipeline 108, valve three 109, suction Inlet valve 110, high-pressure pump 111, suction pipeline 112, second return pipeline 113, all valves are high-pressure gate valves.

As shown in Figure 11, it is the first drum continuous hose tank simulation device 101, including a sealed tank shell system 61, a winding continuous hose drum system 62, and a stirring system 63; the winding continuous hose drum system 62 and the stirring system 63 are respectively Main shaft and bottom housed in sealed tank housing system 61.

As shown in Figures 12-15, the sealed tank shell system 61 mainly includes a first sealed end cover 611, a sealed tank shell 612, a sealed cover 613, a second sealed end cover 614, a discharge port 615, a stirring shaft inlet seal 616, Base bracket 617, continuous hose pulling outlet 618.

As shown in Figure 12-15, the airtight tank shell 612 is in the shape of a large cylinder placed horizontally as a whole, a small cylindrical inspection window is welded at the center of the upper part of the airtight tank shell 612, and a circular flange is welded at the top of the small cylindrical inspection window , install on the top of the small cylinder-shaped inspection port through screws, sealing rings and circular sealing cover 613, and install high-pressure sealing gaskets on the connection surface to form a high-pressure sealing structure. The lower end of the sealed tank shell 612 is welded with an oval funnel, and the lower end of the funnel is vertically welded with a stirring shaft inlet seal 616 and a discharge port 615; the first sealing end cap 611 and the second sealing end cap 614 are circular, and there is a threaded Compress the through hole of the sealing device to install the sealing drive shaft 623; the first sealing end cover 611 and the second sealing end cover 614 are respectively connected to the two ends of the sealing tank housing 612 through screws, flanges and sealing rings to form High-pressure sealing structure; a drum continuous hose pulling outlet 618 is welded on the side of the sealed tank shell 612. The main body of the continuous hose pulling outlet 618 is in the shape of a quadrangular pyramid, and the top end is welded with a circular outlet with a connecting flange, which is used as a continuous hose Circular outlet and connection to external high pressure hose. Base brackets 618 are welded near the two ends of the sealed tank shell 612 to support the sealed tank shell system 61 .

As shown in Figure 16, the winding continuous hose drum system 62 mainly includes a drive motor 621, a drive shaft sealing and pressing cover 622, a drive shaft 623, a continuous hose trailing end 624, a drum 625, a continuous hose 626, and a continuous hose core Pipe interface 627, input shaft sealing compression cover 628, input shaft 629.

As shown in Figure 11 and Figure 16, the drive motor 621 is connected to the drive shaft 623 through a coupling, and one end of the drive shaft 623 supported on the second sealing end cover 614 is provided with a circulating fluid channel, and the circulating fluid channel One end passes through the drive shaft 623 along the axial direction of the drive shaft 623 to form a liquid inlet, and the other end of the circulating fluid channel passes through the drive shaft 623 along the radial direction of the drive shaft 623 to form a liquid outlet. The roller 625 is two ends The cylinder with a circular baffle is fixed on the drive shaft 623 and can rotate together with the drive shaft 623; a continuous hose 626 is wound on the cylinder, and the core pipe interface 627 of the continuous hose is connected to the outlet of the circulating fluid channel. The sealing tank housing 612 is provided with a continuous hose pulling outlet 618, the continuous hose pulling end 624 extends out of the continuous hose pulling outlet 618, and the input shaft 629 is rotatably supported on the second sealing end Cover 614, the drive shaft 623 is docked with the input shaft 629 to form a whole shaft, and the two ends of the whole shaft are respectively pressed and sealed with the drive shaft sealing compression cover 622 and the input shaft sealing compression cover 628; A circulating liquid hole is provided along the axial direction, and the circulating liquid hole communicates with the liquid outlet on the drive shaft 623 . The input shaft 629 is provided with a regulating valve for regulating the flow rate of the circulating fluid.

As shown in FIG. 17 , the stirring system 63 mainly includes a stirring motor 631 , a stirring shaft 632 , and a stirring impeller 633 .

As shown in Figure 11 and Figure 17, the stirring impeller 633 is two symmetrical stirring blades, vertically fixed on the stirring shaft 632, the stirring shaft 632 is installed on the bottom of the sealed tank housing 612 through the stirring shaft inlet seal 616, and the stirring motor 631 is an anti-riot motor, and the lower end of the stirring shaft 632 is connected with the output shaft of the anti-riot motor 631 . The stirring device can assist in the completion of tests such as coiled tubing drilling, sand carrying, scale removal, and wellbore multiphase flow.

As shown in Figure 2, the first drum continuous hose tank simulation device 101 has four interfaces respectively, which are the discharge port 615, the input end of the input shaft 629, the continuous hose core pipe interface 627, the continuous hose pulling outlet 618, the input The input end of the shaft 629 is connected to the input pipeline 108 through flange bolts, the discharge port 615 is connected to the first return pipeline 106 through flange bolts, the continuous hose core pipe interface 627 is connected to the drive shaft through sealing threads, and the continuous hose pulls the outlet 618 is connected to the wellbore inlet hose 104 by flange bolts; the continuous hose 626 is concentric with the wellbore inlet hose 104 .

As shown in Figure 2, the inlet end of the input pipeline 108 is connected to the outlet end of the high-pressure fluid of the high-pressure pump 111 through flange bolts, and the two ends of the input pipeline 108 are respectively equipped with a valve two 105 and a valve four 109, and valve two 105 and valve four 109 The valve three 107 and the second return pipeline 113 are connected in series through a tee, the other end of the second return pipeline 113 is directly connected to the water storage tank 114, the first return pipeline 106 is connected in series with the valve one 102 through flanges and bolts, the first The other end of the return line 106 is connected in parallel to the second return line 113 through a tee.

The fluid output system 3 includes a second drum continuous hose tank simulation device 301, a wellbore outlet hose 304, and a third return line 305. The structure of the second drum continuous hose tank simulation device 301 is similar to that of the first drum continuous hose tank simulation device. The tube and tank simulation device 101 is the same, one end of the wellbore outlet hose 304 is connected to the simulated wellbore system 2, and the other end is connected to the continuous hose pulling outlet of the second drum continuous hose tank simulation device 301, and the second drum continuous hose The drain port of the tank simulator 301 is connected to one end of the third return line 305 , and the other end of the third return line 305 is connected to the water storage tank 114 . The third return line 305 is provided with a valve five 303 .

As shown in Figure 2, the low end of the water storage tank 114 is welded with a water storage tank discharge pipe 115, and the water storage tank discharge pipe 115 is connected with a water storage tank discharge valve 116 through flange bolts, and the fluid suction port of the high-pressure pump 111 passes through the flange The bolt is connected with the suction pipeline 112, the suction inlet valve 110 is installed at the suction inlet, and the other end of the suction pipeline 112 is welded near the bottom of the water storage tank.

As shown in FIGS. 3 , 9 , and 10 , the simulated wellbore system 2 mainly includes simulated wellbore system one 21 , simulated wellbore system two 22 , and simulated wellbore system three 23 .

As shown in Figures 3, 9, and 10, the simulated wellbore system-21 mainly includes the wellbore inlet hose joint 211, the wellbore inlet multifunctional joint 212, the simulated wellbore nipple 213, the tractor system 214, and the tractor center sliding pipe assembly 215 , wellbore outlet multifunctional joint 216, wellbore outlet hose joint 217;

As shown in Figures 3, 9, and 10, the wellbore inlet hose joint 211 is the joint of the wellbore inlet hose 104, with a through-hole flange welded on the top, and the main body of the wellbore inlet multifunctional joint 212 is a thick-walled smooth metal cylinder with welded pockets at both ends For the flange of the sealing groove, four bosses are uniformly welded along the circumferential direction on the outer wall of the middle part of the metal cylinder. The cross-section of the bosses perpendicular to the axial direction of the cylinder is trapezoidal, and the cross-section along the axial direction of the cylinder is rectangular. ;

There are 7 simulated wellbore nipples 213 in total. The main body of the simulated wellbore nipples 213 is smooth and cylindrical, and sealing groove flanges with through holes are welded at both ends;

The tractor system 214 is an electronically controlled hydraulically driven continuous hose downhole tractor, which is the main experimental tool of the experimental device. In the middle of the tractor is a long sliding shaft with water holes in the center and sealing buckle joints at both ends. Joint, one end of the long axis is in sealing connection with the continuous hose, and the other end is in sealing connection with the central sliding pipe assembly 215 of the tractor; Coiled tubing downhole tractor" center slide assembly includes: upper center slide, circulating fluid filter, lower center slide. The tractor center slide tube assembly 215 is a long straight rod with concentric water holes in the middle and sealed buckle joints at both ends; the tractor center slide tube assembly is located in the sealed simulated shaft, and the tractor center slide tube assembly One end is connected to the continuous hose of the fluid output system.

The wellbore outlet multifunctional joint 216 has the same structure and function as the wellbore entrance multifunctional joint 212, and various sensors can be arranged in the multifunctional joint;

The wellbore outlet hose joint 217 has exactly the same structure as the wellbore inlet hose joint 211, except that it is connected to the wellbore outlet hose 304;

The wellbore inlet hose joint 211, the wellbore inlet multifunctional joint 212, the seven simulated wellbore nipples 213, the wellbore outlet multifunctional joint 216 and the wellbore outlet hose joint 217 are connected together by sealing flanges and bolts to form a Long sealed simulated wellbore;

As shown in Figure 3, the simulated wellbore system 222 mainly includes the simulated boss wellbore sub-joint 221, the simulated gradual-diameter wellbore sub-joint 222, the simulated stepped wellbore sub-joint 223, the simulated dog-leg wellbore sub-joint 224, and the simulated fish-maw large wellbore sub-joint. Section 225, simulation necking large wellbore sub-section 226, simulation bending large wellbore sub-section 227;

The main body of the simulated boss wellbore pup 221 is a thick-walled cylinder with through-hole flanges welded at both ends, with an inner concave-convex platform in the middle;

The main body of the simulated tapered diameter wellbore nipple 222 is a welded body of a conical cylinder and a straight cylinder with a small diameter along the axial direction. Through-hole flanges are welded at both ends;

The main body of the simulated stepped sill short joint 223 is a welded body of a conical cylinder and a straight cylinder with a small diameter along the axial direction. Shaped boss, the two ends of the main body are respectively welded with through-hole flanges;

The simulated dog-leg wellbore nipple 224 is a thick-walled cylinder with through-hole flanges welded at both ends and a bend in the middle;

The simulated fish maw large wellbore nipple 225 is a thick-walled large cylinder with through-hole flanges welded at both ends and a drum-shaped expansion in the middle;

The simulated constricted large wellbore pup joint 226 is a thick-walled large cylinder with through-hole flanges welded at both ends and a spindle-shaped shrinkage in the middle;

The simulated curved large shaft sub-joint 227 is a special-shaped thick-walled cylinder with through-hole flanges welded at both ends and one side shrinking inward.

As shown in Figure 3, the simulated wellbore system 3 23 mainly includes the simulated keyway wellbore nipple 231, the simulated expanded diameter wellbore nipple 232, the simulated unilateral convex wellbore nipple 233, the simulated quick-shrinking diameter wellbore nipple 234, and the simulated fish maw small wellbore A short joint 235 , a short joint 236 for simulating a narrowed small wellbore, and a short joint 237 for simulating a curved small wellbore.

The simulated keyway wellbore nipple 231 is a thick-walled cylinder with through-hole flanges welded at both ends and a concentrically convex thick-walled large cylinder welded in the middle through vertical steps;

The simulated expansion wellbore nipple 232 is a thick-walled cylinder with through-hole flanges welded at both ends and two cylinders with different diameters welded together through vertical steps in the middle;

The simulated unilateral convex wellbore nipple 233 is a thick-walled cylinder with through-hole flanges welded at both ends and asymmetrically reduced diameter in the middle;

The simulated quick-shrinking wellbore pup joint 234 is a thick-walled cylinder with through-hole flanges welded at both ends and two cylinders with different diameters welded together through a tapered step in the middle;

The simulated fish maw small wellbore nipple 235 is a thick-walled small cylinder with through-hole flanges welded at both ends and a drum-shaped expansion in the middle;

The simulated necking small wellbore pup joint 236 is a thick-walled small cylinder with through-hole flanges welded at both ends and a spindle-shaped shrinkage in the middle;

The simulated curved small shaft sub-joint 237 is a special-shaped thick-walled small cylinder with two ends welded with through-hole flanges and one side shrinking inward.

The lengths of all the above-mentioned nipples are equal, and the outer diameter of the welded through-hole flange and the bolt holes match each other. You can choose 7 different nipples to connect with bolts to form different wellbores. 1, the wellbore inlet multifunctional joint 212, the wellbore outlet multifunctional joint 216, and the wellbore outlet hose joint 217 form simulated wellbores with different conditions to meet the needs of experiments.

As shown in Figure 4-8, the platform system 4 mainly includes the shaft main fixture system 1 41, the main lifting system 42, 14 shaft auxiliary fixture systems 43, the platform slide rail system 44, the sliding platform system 45, and the auxiliary lifting system 46 , Shaft main fixture system 2 47;

The platform slide rail system 44 is two parallel long slide rails fixed on the compacted foundation;

The main body of the sliding platform system 45 is a platform that is welded in parallel by four I-beams. Two pulleys are installed at both ends of the platform. The sliding platform system 45 is placed on the two slide rails of the platform slide rail system 44 with the four pulleys as fulcrums. Can slide along the slide rail;

Wellbore main fixture system 1 41, wellbore main fixture system 2 47, and 14 wellbore auxiliary fixture systems 43 are respectively coaxially welded on the sliding platform system 45, and each two groups form an integral installation with the sliding platform system 45 to simulate the wellbore experiment Bench;

The main hoisting system 42 and the auxiliary hoisting system 46 are fixed vertically on the compacted foundation of the platform slide rail system 44 respectively, and are distributed near the two ends of the sliding platform system 45. The main bodies of the main hoisting system 42 and the auxiliary hoisting system 46 are The truss structure is equipped with a movable pulley block and a fixed pulley block. The movable pulley and the fixed pulley on the two hoisting systems are connected together by wire ropes to form a labor-saving pulley combination. The wire rope is pulled under the ground motor drive, and the sliding platform system is realized through the pulley block. Overall lifting and lowering, so as to realize the wellbore experiment simulating any well inclination angle.

As shown in Figure 5-6, the wellbore main fixture system 1 41 mainly includes the upper fixing cover 411 of the wellbore main fixture and the fixing base 412 of the wellbore main fixture; Rectangular bolt fixing ears are welded; the fixing base 412 of the wellbore main fixture, the main body is a thick-walled semicircular compression slip, and the two ends are welded with bolt fixing ears matching the fixing cover 411 rectangular bolt fixing ears of the wellbore main fixture. The upper fixed cover 411 of the main fixture is fixed on the fixed base 412 of the main fixture of the wellbore through bolts and fixing ears. Form a whole; the semicircular inner hole of the fixed cover 411 on the shaft main fixture is matched with the semicircular inner hole of the fixed base 412 of the wellbore main fixture to form a thick-walled cylinder, and the diameter of the circle is just equal to the outer diameter of the multifunctional joint 212 at the wellbore entrance. At the same time, the fixed cover 411 on the wellbore main fixture and the fixed base 412 of the wellbore main fixture form a thick-walled cylinder with four grooves evenly distributed on the center inner wall. The grooves are trapezoidal along the section perpendicular to the cylinder axial direction, along The cross-section passing through the axial direction of the cylinder is rectangular, and the four grooves just match the four bosses on the outer wall of the wellbore inlet multifunctional joint 212, so that the wellbore entrance multifunctional joint 212 can be installed on the wellbore main fixture to fix the cover 411 and the wellbore The main clamp is fixed in the thick-walled cylinder formed by the fixed base 412 .

As shown in Figure 4 and 7-8, a total of 14 wellbore clamp systems 43 are evenly welded on the sliding platform system, mainly including wellbore auxiliary fixture locking bolts 431, wellbore auxiliary fixture locking slips 432, wellbore auxiliary fixture fixing Cover 433, shaft auxiliary fixture fixing base 434.

The main body of the locking bolt 431 of the wellbore auxiliary fixture is a long bolt with trapezoidal thread, with a round hole on the top, which is convenient for tightening the bolt, and the bottom is spherical, which is convenient to form a universal connection with the locking slip 432 of the wellbore auxiliary fixture;

The main body of the locking slip 432 of the wellbore auxiliary fixture is an arc-shaped slip, with a plastic gasket on the arc-shaped inner wall, and a hemispherical hole in the center of the outer wall of the apartment, which is convenient to form a universal connection with the bottom ball of the locking bolt 431 of the wellbore auxiliary fixture;

The upper cover 433 fixed by the wellbore auxiliary fixture and the fixed base 434 of the wellbore auxiliary fixture are both a thick-walled semi-cylindrical cylinder, which is connected by welding fixing ears and bolts to form a cylinder, and starting from the top of the round hole, three cylinders are evenly distributed in the circumferential direction to connect with the wellbore. Auxiliary fixture locking bolt 431 trapezoidal thread matches the threaded hole, and is welded with reinforcing plate on the outer wall of each threaded hole, and the bottom of shaft auxiliary fixture fixing base 434 is welded on the sliding platform 45 through vertical support plate.

As shown in Figure 2, the data acquisition and control system 5 mainly includes a signal acquisition and input system 51, a signal processing control system 52, a display system 53, and a bidirectional input and output control system 54;

The signal acquisition and input system 51 mainly includes the circulating pressure difference, flow velocity, pipe wall friction, pressure, and tensile, compressive, torsion, and vibration resistance of each sub-joint in the experimental process of each group of simulated wellbore system. The collection of signals such as the tractor, tractor, and the signals such as the control of the experimental platform and the control of the tractor are sent to the signal processing control system 52; the signal processing control system 52 mainly consists of a processor, which is responsible for processing each experimental signal; display The system 53 is mainly composed of a display, which displays information such as collected data, processing results, and operating conditions; the two-way input and output control system 54 mainly includes relevant input and output converters, data lines, etc., and is used to control the tractor and individual experimental parameters Input and output control functions.

Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that it can be described in terms of form and Various changes may be made in the details without departing from the scope of the invention defined by the claims.

Claims (9)

1. A kind of 1. coiled tubing Electro-hydraulic drive tractor experimental provision, it is characterised in that：Including fluid infusion system, simulation Wellbore system, fluid output system and water tank, the input of the fluid infusion system, the output end of fluid output system It is connected with water tank, the both ends of the simulation wellbore hole system output end with fluid infusion system, fluid output system respectively Input connection, form the fluid circulation channel of closure；

   The fluid infusion system includes the first roller continuous hose tank analogue means, tractor entrance continuous hose, pit shaft and entered Mouth flexible pipe, the first reflux pipeline, intake pipeline, high-pressure pump, suction line, the second reflux pipeline,

   The first roller continuous hose tank analogue means includes cylindrical sealing tank shell, the sealing tank shell axial direction Both ends by the first end cover, the second end cover seal, sealing tank shell in be provided with roller, drive shaft, the roller Circumferentially fixed the drive shaft and sealing tank shell are coaxial on the driving shaft, and the both ends rotational support of drive shaft is in the first sealing End cap, the second end cover, continuous hose are wound with roller, one end that the drive shaft is supported in the second end cover is provided with Circulation fluid passage, the axial direction of one end of the circulation fluid passage along drive shaft pass drive shaft, form inlet, circulation fluid passage Radial direction of the other end along drive shaft pass drive shaft, form liquid outlet, input and the circulation fluid passage of the continuous hose Liquid outlet connection, the sealing tank shell is provided with continuous hose traction outlet, and the traction end of the continuous hose extends Continuous hose traction outlet, for being connected with tractor, the lower end for sealing tank shell is provided with discharge port；

   The inlet of the drive shaft and one end of intake pipeline connect, the outlet of the other end and high-pressure pump of the intake pipeline End is connected, and the entrance point of high-pressure pump and one end of suction line connect, the other end access water tank of suction line, input pipe The stage casing of line connects one end of the second reflux pipeline, the other end access water tank of the second reflux pipeline, the discharge port and the One end connection of one reflux pipeline, the other end access water tank of first reflux pipeline, the continuous hose traction outlet It is connected with one end of pit shaft inlet tubes, one end of the pit shaft inlet tubes is connected with simulation wellbore hole system.
2. 2. coiled tubing Electro-hydraulic drive tractor experimental provision according to claim 1, it is characterised in that：It is described defeated Enter pipeline provided with valve two, valve four, wherein, valve two is adjacent with the first roller continuous hose tank analogue means, and described the For two reflux pipelines between valve two, valve four, the second reflux pipeline is provided with valve three, is set on first reflux pipeline There is valve one, the suction line is provided with suction inlet valve.
3. 3. coiled tubing Electro-hydraulic drive tractor experimental provision according to claim 1, it is characterised in that：The stream Body output system includes second tin roller continuous hose tank analogue means, pit shaft outlet hose, the 3rd reflux pipeline, second rolling The structure of cylinder continuous hose tank analogue means is identical with the first roller continuous hose tank analogue means, the pit shaft outlet hose One end is connected with simulation wellbore hole system, and the continuous hose traction outlet of the other end and second tin roller continuous hose tank analogue means connects Connect, the discharge port of second tin roller continuous hose tank analogue means is connected with one end of the 3rd reflux pipeline, the 3rd reflux pipeline The other end connects water tank.
4. 4. coiled tubing Electro-hydraulic drive tractor experimental provision according to claim 3, it is characterised in that：Described Three reflux pipelines are provided with valve five.
5. 5. coiled tubing Electro-hydraulic drive tractor experimental provision according to claim 1, it is characterised in that：The mould Intending wellbore system includes pit shaft inlet tubes joint, pit shaft outlet hose joint, and by some simulation wellbore hole pipe nipple connection groups Into sealing simulation wellbore hole, the pit shaft inlet tubes joint, pit shaft outlet hose joint be fixed on sealing simulation wellbore hole two End, pit shaft inlet tubes joint are connected with pit shaft inlet tubes, and pit shaft outlet hose joint is connected with pit shaft outlet hose.
6. 6. coiled tubing Electro-hydraulic drive tractor experimental provision according to claim 5, it is characterised in that：It is described Each simulation wellbore hole pipe nipple of sealing simulation wellbore hole is fixedly connected by removably, and the simulating shape of each simulation wellbore hole pipe nipple needs The wellbore shape of experiment.
7. 7. coiled tubing Electro-hydraulic drive tractor experimental provision according to claim 1, it is characterised in that：Also include Plateform system, the plateform system include chucking appliance system, platform slide rail, sliding platform, and the sliding platform slide-and-guide is in flat Platform slide rail, the chucking appliance system are fixed on sliding platform, and clamp simulation wellbore hole system.
8. 8. coiled tubing Electro-hydraulic drive tractor experimental provision according to claim 7, it is characterised in that：It is described flat Platform system also includes main hoisting system and auxiliary hoisting system, and main hoisting system and auxiliary hoisting system are separately positioned on platform slide rail and indulged To both ends, for distinguishing raising and the decline at control platform slide rail longitudinal direction both ends, so as to realize the well for simulating any hole angle Cylinder experiment.
9. 9. coiled tubing Electro-hydraulic drive tractor experimental provision according to claim 1, it is characterised in that：Also include Data collection and control system, the data collection and control system gather fluid infusion system, simulation wellbore hole system, stream respectively The data of body output system, corresponding control signal is sent after being handled, realize experiment of the tractor in simulation wellbore hole.