Sleeve-in-sleeve fixed sleeve running sleeve frictional resistance detection device and detection method

Abstract

The invention discloses a device and a method for detecting frictional resistance of a casing in a fixed casing. The device comprises a first pipe body, a second pipe body, a third pipe body, a fourth pipe body, a weighting pipe fitting, a fifth pipe body and a drill bit mechanism which are connected in sequence, the second pipe body and the third pipe body are rotationally connected through a first meshing rotating assembly driving the third pipe body to rotate in the circumferential direction. The third pipe body and the fourth pipe body are rotationally connected through a second meshing rotating assembly driving the fourth pipe body to rotate in the circumferential direction. The second pipe body and the third pipe body are each provided with a friction resistance detection assembly of the same structure, and the friction resistance detection assemblies are used for detecting the friction resistance between the casing and a shaft in the wall attaching advancing process. By means of the friction resistance detection assembly, friction resistance of different casing pipe tripping-in working conditions during casing fixing in the test casing can be simulated in the tripping-in process, the simulated working conditions better fit the actual situation, a decision basis is provided for later casing pipe safe tripping-in, an old well shaft can be cleaned, and later casing pipe safe tripping-in is guaranteed.

Description

Technical Field

[0001] The present invention belongs to the technical field of detection of friction resistance in drilling and completion, and particularly relates to a device and a method for detecting the friction resistance of a casing under a fixed casing in a casing. Background Art

[0002] In recent years, China's dependence on foreign oil and natural gas has been increasing year by year. As a major manufacturing country, China needs to develop its real economy, and related energy technologies are crucial. Drawing on the successful experience of the shale oil and gas revolution in the United States, since the beginning of this century, large-scale volume fracturing technology has been used in the development of low-permeability oil and gas reservoirs and has developed vigorously, ensuring the construction and production increase of multiple large oil and gas basins and large oil enterprises in China. For example, the output of Changqing Oilfield has exceeded 60 million tons for many consecutive years, and the oil and gas equivalent of Yanchang Oilfield has successfully exceeded 20 million tons.

[0003] However, a prominent development difficulty in such oil and gas basins is that the production of oil and gas wells decreases rapidly, and a large number of highly deviated wells and horizontal low-yield and low-efficiency old wells have become "idle wells". With the rapid iterative development of fracturing technology, the scale of fracturing is getting larger, the fracturing methods are getting more, and the volume of transformation is also getting larger. Due to the early construction of the above-mentioned "idle wells" and being limited by the technical means at that time, many reservoir sections have not been fully transformed and still have great potential for rescue. Therefore, refracturing the unfully transformed well sections of these old wells to restore production capacity has become an important production increase measure in oil and gas fields.

[0004] In the current refracturing technology, there is a new technical method of running a small casing into the existing casing to perform casing-in-casing cementing in the casing, that is, reconstructing the wellbore in the way of "casing-in-casing", and then conducting large-scale fracturing. Field implementation shows that the scale and effect of refracturing by this method are the best at present, and the stimulation volume and production can be increased on a large scale. In order to maximize the stimulation scale, the size of the casing run in for casing-in-casing must be large enough. However, most of the old wells in low-permeability reservoirs are highly deviated wells or horizontal wells, and there are already casings in the wells with relatively small inner diameters and extremely small annulus clearances (taking the example of running a 4.5-inch casing into an 8.5-inch casing, the annulus clearance is one-tenth of the conventional clearance). When running the casing for casing-in-casing, the difficulty and risk of running the casing are extremely high. Therefore, the core of the success of such refracturing is how to judge whether the casing can be safely run in. If the casing cannot be fully lowered and its lowering limit cannot be predicted, the prediction or test of the friction resistance during casing running is extremely important. There are some algorithms in the existing technology for calculating and predicting the friction resistance during casing running, but they are all under conventional working conditions where the annulus clearance generally exceeds 19 mm. For the new technical form of ultra-small clearance like casing-in-casing, other tests are not applicable. The main difficulties and requirements for running the casing for refracturing in such old wells are as follows: First, due to years of production in the old wellbore, there is a large amount of scale, sand, etc. on the wellbore wall, which needs to be cleaned; second, affected by the original wellbore trajectory and years of production, there are many wide and narrow sections, twisted sections, and deformed sections in the wellbore, making it difficult to predict and test the friction resistance; third, there may be wear or wall thickness changes of the casing in some well sections of the original wellbore. Whether it can continue to serve for subsequent fracturing or production (whether it is necessary to run new casings throughout the wellbore) needs to be evaluated. Summary of the Invention

[0005] Aiming at the defects of the existing technology, the present invention provides a device and method for detecting the friction resistance of casing running for casing-in-casing, which can simulate and test the friction resistance of different casing running conditions during casing-in-casing during the running-in process, the simulated working conditions are more in line with the actual situation, and can clean the old wellbore, providing a decision-making basis for the safe running-in of the subsequent casing and ensuring the safe running-in of the subsequent casing.

[0006] A device for detecting the friction resistance of casing running for casing-in-casing includes a first pipe body, a second pipe body, a third pipe body, a fourth pipe body, a weight fitting, a fifth pipe body, and a bit mechanism connected in sequence; The second pipe body and the third pipe body are rotationally connected through a first meshing rotation assembly that drives the third pipe body to rotate circumferentially; the third pipe body and the fourth pipe body are rotationally connected through a second meshing rotation assembly that drives the fourth pipe body to rotate circumferentially; The second pipe body and the third pipe body are both provided with friction resistance detection components with the same structure for detecting the friction resistance between the casing and the wellbore during the process of advancing while adhering to the wall.

[0007] Preferably, the friction resistance detection assembly includes a mounting ring, a pressure sensor connected to the mounting ring, a second movable ring, and a first movable ring; the mounting ring is respectively fixed on the corresponding pipe body, and the first movable ring and the second movable ring are slidably arranged on the corresponding pipe body; the pressure sensor is connected to the second movable ring, and the second movable ring and the first movable ring are both connected by springs; the mounting ring and the second movable ring, and the second movable ring and the first movable ring are both connected by a plurality of link assemblies distributed circumferentially along the second movable ring, and the link assemblies are located outside the springs; the link assembly includes a first link and a second link, and the two ends of the first link and the second link close to each other are hinged to the same contact wheel, and the two ends of the first link and the second link away from each other are respectively hinged to the mounting ring and the second movable ring, or the two ends of the first link and the second link away from each other are respectively hinged to the second movable ring and the first movable ring.

[0008] Preferably, the first meshing and rotating assembly includes a first connecting sleeve fixedly connected to the second pipe body, a first external tooth ring connected to the end of the third pipe body is rotatably arranged at the end of the first connecting sleeve, a first motor is further arranged on the outer wall of the first connecting sleeve, and an output shaft of the first motor is connected to a first gear that meshes with and is in the same plane as the first external tooth ring. Through the meshing transmission of the first gear and the first external tooth ring, the friction resistance detection assembly on the third pipe body can be driven to rotate circumferentially to adapt to the working condition of rotating the casing.

[0009] Preferably, the second meshing and rotating assembly includes a second connecting sleeve fixedly connected to the third pipe body, a second external tooth ring connected to the end of the fourth pipe body is rotatably arranged at the end of the second connecting sleeve, a second motor is further arranged on the outer wall of the second connecting sleeve, and an output shaft of the second motor is connected to a second gear that meshes with and is in the same plane as the second external tooth ring. Through the meshing transmission of the second gear and the second external tooth ring, the fourth pipe body and the weight member can be driven to rotate circumferentially, thereby driving the bit to perform compound drilling, improving the dirt cleaning efficiency of the horizontal section and the tool anti-sticking effect, so as to adapt to the detection environment of the horizontal well.

[0010] Preferably, the bit mechanism includes a connecting shaft and a mounting seat sequentially connected to the fifth pipe body. A plurality of rectangular grooves are circumferentially and uniformly distributed on the outer wall of the mounting seat. Transmission shafts connected by a conveyor belt are respectively arranged at both ends of the rectangular groove. The outer wall of the conveyor belt is evenly provided with tunneling heads; a plurality of third motors corresponding to the number of rectangular grooves are further arranged on the mounting seat, and an output shaft of each third motor is connected to one of the transmission shafts in the rectangular groove; the conveying direction of the conveyor belt is parallel to the advancing direction of the bit.

[0011] Preferably, four groups of tunneling heads are evenly arranged on the outer wall of the conveyor belt along the circumferential direction of the mounting seat, and the excavation parts on the two middle tunneling heads face the connecting shaft, while the excavation parts on the two edge tunneling heads face away from the connecting shaft.

[0012] Preferably, the mounting seat is also provided with a plurality of grooves corresponding to the number of rectangular grooves, and tunneling rollers are arranged in the grooves. The tunneling rollers are connected to a transmission shaft connected to a third motor through a mounting shaft, and the tunneling direction of the tunneling rollers is the same as the conveying direction of the conveyor belt.

[0013] Preferably, two electromagnetic flaw detection modules are symmetrically arranged on each of the first pipe body, the second pipe body, the third pipe body, the fourth pipe body, and the fifth pipe body.

[0014] Preferably, the friction resistance detection device for the casing fixed in the sleeve is a hollow structure, and a one-way valve is arranged at the hollow structure of the drill bit mechanism. The one-way valve can control the fluid to flow unidirectionally from the first pipe body to the drill bit mechanism and flow out from the drill bit mechanism.

[0015] A method for detecting the friction resistance of the casing fixed in the sleeve, which is carried out by using the detection device of the present invention, includes the following steps: S1: Lower the friction resistance detection device for the casing fixed in the sleeve into the original wellbore to conduct the detection work of the wellbore. The detection device advances along the wall. During the lowering process, the drill bit mechanism clears the dirt on the wellbore wall. In the horizontal section, the fourth pipe body and the weight member are driven to rotate through the second meshing and rotating assembly, so as to drive the drill bit to perform compound drilling and improve the cleaning efficiency of the wellbore. S2: Calculate the friction resistance of the casing fixed in the sleeve according to the values measured by the friction resistance detection assembly. For different working conditions, the calculation is as follows: 1. For the conventional casing running condition, the following formula (1) is used to calculate the friction resistance of the casing fixed in the sleeve: (1), where F h is the friction resistance when the casing is lowered to the well depth h in the conventional casing running condition of the casing fixed in the sleeve, and the unit is KN; h is the test well depth, and the unit is m; i is the well depth of the contact point of the friction resistance detection assembly during the detection process, and the value ranges from 1 to h and the unit is m; v c is the lowering speed of the casing when the casing is fixed in the sleeve, and the unit is m / s; rc is the outer diameter of the casing when the casing is installed in the sleeve and fixed sleeve, with the unit of mm; M i is the well depth tested by the friction resistance detection component set on the second pipe body i at the force value, with the unit of KN; v 1 is the lowering speed of the friction resistance detection device, with the unit of m / s; r 1 is the outer diameter of the friction resistance detection component set on the second pipe body in the natural state, with the unit of mm; k is the well deviation gravity coefficient, dimensionless; when the well deviation angle is 0 k the value is 1; when the well deviation angle is not 0 k the value is , where G c is the linear weight of the casing during the casing installation in the sleeve and fixed sleeve construction, G 1 is the linear weight of the friction resistance detection device for the casing installed in the sleeve and fixed sleeve, and the units of both are kg / m; II. For the working condition of rotating the casing while lowering, drive the third pipe body to rotate circumferentially through the first meshing rotation component, thereby driving the friction resistance detection component on it to rotate. The following formula (2) is used to calculate the friction resistance of the casing installed in the sleeve and fixed sleeve while lowering: (2), where, N h is the friction resistance when the casing is lowered to the well depth h during the casing installation in the sleeve and fixed sleeve under the working condition of rotating the casing while lowering, with the unit of KN; n c is the rotation speed of the casing when the rotating casing is lowered during the casing installation in the sleeve and fixed sleeve construction, with the unit of r / min; n 1 is the rotation speed of the friction resistance detection component set on the third pipe body, with the unit of r / min; r 2 is the outer diameter of the friction resistance detection component set on the third pipe body in the natural state, with the unit of mm; P i is the well depth tested by the friction resistance detection component set on the third pipe body i at the force value, with the unit of KN.

[0016] Advantages of the present invention: (1)The present invention is provided with a friction resistance detection component, which can test the friction resistance of the new process of lowering a new casing into an old well casing during the process of advancing while adhering to the wall. Different working conditions such as conventional casing lowering and rotary casing lowering are fully considered, and the actual working conditions of casing lowering in the later stage are highly simulated. The friction resistance of casing lowering is obtained through testing, providing technical support for later casing lowering. The testing method is simple and the testing accuracy is high, meeting the technical requirements of the new technology of casing-in-casing. (2)Through the setting of the drill bit mechanism and the further setting of the second meshing rotation component, on the one hand, high-efficiency drilling of the drill bit mechanism can be achieved, and on the other hand, sticking and jamming of the drill string can be prevented by rotating the drill bit mechanism, thereby adapting to the cleaning work of the dirt in the old wellbore of the vertical well section and the horizontal well section, which helps the safe lowering of the casing in the later stage. Brief Description of the Drawings

[0017] Figure 1 is a schematic structural diagram of the present invention; Figure 2 is Figure 1 a partially enlarged structural diagram of Figure 3 is a partially enlarged structural diagram of the friction resistance detection component of the present invention; Figure 4 is a partially enlarged structural diagram of the drill bit mechanism of the present invention; Figure 5 Test data diagram of the present invention device under the condition of conventional casing lowering; Figure 6 Comparison diagram between the present invention under the condition of conventional casing lowering and the actual on-site situation; Figure 7 Test data diagram of the present invention device under the condition of rotary casing lowering; Figure 8 Comparison diagram between the present invention under the condition of rotary casing lowering and the actual on-site situation; Among them, 1, the first pipe body; 2, the second pipe body; 3, the third pipe body; 4, the fourth pipe body; 5, the fifth pipe body; 611, the connecting shaft; 612, the mounting seat; 613, the conveyor belt; 614, the tunneling head; 615, the tunneling roller; 616, the transmission shaft; 617, the third motor; 7, the electromagnetic flaw detection module; 81, the friction resistance detection component; 811, the first movable ring; 812, the first connecting rod; 813, the second connecting rod; 814, the second movable ring; 815, the mounting ring; 816, the spring; 817, the contact wheel; 818, the pressure sensor; 911, the first motor; 912, the first connecting pipe sleeve; 913, the first gear; 914, the first external gear ring; 10, the weight pipe fitting; 111, the second motor; 112, the second connecting pipe sleeve; 113, the second external gear ring; 114, the second gear. Detailed Embodiments

[0018] Example 1 A friction resistance detection device for a casing fixed inside another casing and lowering the casing, comprising a first pipe body 1, a second pipe body 2, a third pipe body 3, a fourth pipe body 4, a weight pipe fitting 10, a fifth pipe body 5 and a drill bit mechanism connected in sequence; the weight pipe fitting 10 is used to pressurize the drill bit mechanism; The second pipe body 2 and the third pipe body 3 are rotationally connected through a first meshing rotation assembly for driving the third pipe body 3 to rotate circumferentially; the third pipe body 3 and the fourth pipe body 4 are rotationally connected through a second meshing rotation assembly for driving the fourth pipe body 4 to rotate circumferentially; Friction resistance detection assemblies 81 with the same structure are arranged on both the second pipe body 2 and the third pipe body 3, and are used to detect the friction resistance between the casing and the wellbore during the process of advancing along the wall.

[0019] Under the actions of the advancement of the detection device and its own drilling operation, the drill bit mechanism drives the detection device to penetrate deeper to conduct the detection work of the wellbore. Through the provided friction resistance detection assembly 81, the friction resistance between the casing and the wellbore can be measured during the process of advancing along the wall, providing a decision basis for the safe lowering of the casing in the later stage and ensuring the safe lowering of the casing in the later stage.

[0020] Example 2 On the basis of the above Example 1, the friction resistance detection assembly 81 includes a mounting ring 815, a pressure sensor 818 connected to the mounting ring 815, a second movable ring 814 and a first movable ring 811; the mounting ring 815 is respectively fixed on the corresponding pipe body, and the first movable ring 811 and the second movable ring 814 are slidably arranged on the corresponding pipe body; the pressure sensor 818 is connected to the second movable ring 814 and the second movable ring 814 is connected to the first movable ring 811 through springs 816; the mounting ring 815 is connected to the second movable ring 814 and the second movable ring 814 is connected to the first movable ring 811 through a plurality of link assemblies distributed circumferentially along the second movable ring 814, and the link assemblies are located outside the springs 816; the link assemblies include a first link 812 and a second link 813. The two ends of the first link 812 and the second link 813 close to each other are hinged to the same contact wheel 817, and the two ends of the first link 812 and the second link 813 away from each other are respectively hinged to the mounting ring 815 and the second movable ring 814, or the two ends of the first link 812 and the second link 813 away from each other are respectively hinged to the second movable ring 814 and the first movable ring 811.

[0021] In this embodiment, through the friction resistance detection component 81 provided, the mounting ring 815 is fixedly arranged, and the second movable ring 814 and the first movable ring 811 are both slidably arranged. When the detection device advances in the casing under different environments, when the contact wheel 817 simulates the forward movement and adheres to the wall, a certain friction resistance is generated, pushing the first connecting rod 812 and the second connecting rod 813 connected to the contact wheel 817 to slide backward along the axial direction of the device, driving the second movable ring 814 and the first movable ring 811 to slide towards the direction close to the mounting ring 815. When the length of the spring 816 is compressed, the reading of the corresponding pressure sensor 818 changes. Through the degree of change in the reading of the pressure sensor 818, the value of the force measured by the friction resistance detection component 81 provided on the corresponding pipe body can be obtained.

[0022] Further, the contact wheel 817 is rotatable or fixed, simulating the working conditions with roller centralizers or rigid centralizers respectively.

[0023] Embodiment 3 On the basis of the above Embodiment 2, the first meshing and rotating component includes a first connecting pipe sleeve 912 fixedly connected to the second pipe body 2. A first external gear ring 914 connected to the end of the third pipe body 3 is rotatably arranged at the end of the first connecting pipe sleeve 912. A first motor 911 is further arranged on the outer wall of the first connecting pipe sleeve 912. The output shaft of the first motor 911 is connected to a first gear 913 that meshes and drives with the first external gear ring 914 and is in the same plane. The first external gear ring 914 is rotatably arranged relative to the first connecting pipe sleeve 912, and the two can perform epicyclic motion. When the first motor 911 works, it drives the first gear 913 to mesh and drive with the first external gear ring 914, thereby driving the third pipe body 3 connected thereto to perform a 360° revolution, and then driving the friction resistance detection component 81 on the third pipe body 3 to rotate, simulating the working condition of rotating casing running, and detecting the friction resistance between the casing and the wellbore.

[0024] Further, the second meshing and rotating component includes a second connecting pipe sleeve 112 fixedly connected to the third pipe body 3. A second external gear ring 113 connected to the end of the fourth pipe body 4 is rotatably arranged at the end of the second connecting sleeve. A second motor 111 is further arranged on the outer wall of the second connecting pipe sleeve 112. The output shaft of the second motor 111 is connected to a second gear 114 that meshes and drives with the second external gear ring 113 and is in the same plane. When the second motor 111 works, it drives the second gear 114 to mesh and drive with the second external gear ring 113, driving the fourth pipe body 4 to revolve along the end of the second connecting pipe sleeve 112, thereby driving the heavy pipe fitting 10, the fifth pipe body 5, and the drill bit mechanism to rotate, improving the dirt cleaning efficiency in the horizontal section and the anti-sticking effect of the tool, so as to adapt to the detection environment of the horizontal well.

[0025] Embodiment 4 On the basis of the above-mentioned Embodiment 3, the drill bit mechanism includes a connecting shaft 611 and a mounting seat 612 that are successively connected to the fifth pipe body 5. A plurality of rectangular grooves are circumferentially and evenly distributed on the outer wall of the mounting seat 612. Transmission shafts 616 connected by a conveyor belt 613 are respectively arranged at both ends of the rectangular groove. The outer wall of the conveyor belt 613 is evenly provided with tunneling heads 614; a plurality of third motors 617 corresponding to the number of rectangular grooves are also arranged on the mounting seat 612. The output shaft of each third motor 617 is connected to one of the transmission shafts 616 in the rectangular groove; the conveying direction of the conveyor belt 613 is parallel to the advancing direction of the drill bit. As Figure 4 shown, when the third motor 617 works, it drives the transmission shaft 616 to rotate and the conveyor belt 613 to drive, thereby driving the tunneling head 614 to drill in parallel with the advancing direction of the casing, and then the in-depth work of cleaning the wellbore can be carried out.

[0026] Further, four groups of tunneling heads 614 are evenly arranged on the outer wall of the conveyor belt 613 along the circumference of the mounting seat 612. The excavation parts on the two groups of tunneling heads 614 in the middle face the connecting shaft 611, and the excavation parts on the two groups of tunneling heads 614 at the edges face away from the connecting shaft 611. When it is difficult to advance, the third motor 617 is used to control the forward and backward movement of the conveyor belt 613 to realize the reciprocating drive of the conveyor belt 613, so that the tunneling head 614 switches the excavation direction, which is convenient for breaking through and removing residues, dirt, etc. around, and effectively improves the wellbore cleaning work.

[0027] Further, a plurality of grooves corresponding to the number of rectangular grooves are also arranged on the mounting seat 612. Tunneling rollers 615 are arranged in the grooves. The tunneling rollers 615 are connected to the transmission shafts 616 connected to the third motors 617 through mounting shafts, and the tunneling direction of the tunneling rollers 615 is the same as the conveying direction of the conveyor belt 613. Through the further arranged tunneling rollers 615, when the tunneling head 614 works, the transmission shaft 616 rotates to drive the tunneling rollers 615 to rotate, and then the rotational cleaning work is carried out. The tunneling head 614 assists and cooperates to further improve the advancing efficiency of the drill bit.

[0028] Embodiment 5 On the basis of the above-mentioned Embodiment 4, two electromagnetic flaw detection modules 7 are symmetrically arranged on each of the first pipe body 1, the second pipe body 2, the third pipe body 3, the fourth pipe body 4, and the fifth pipe body 5. The electromagnetic flaw detection module 7 is a mature existing technology (EMDS / MDT type or DS-WC series), belonging to the category of magnetic logging. The electromagnetic induction law is the theoretical basis for the application of this equipment. It can transmit a DC pulse to the transmitting coil, and the receiving coil senses the change in the induced electromotive force at different time points and records the relevant information in real time. When the thickness of the casing changes or there are design defects, the induced electromotive force will change accordingly. By using methods such as analysis and calculation, it is possible to accurately identify whether there are quality problems such as cracks and holes in the single-casing or double-casing string structure, and then clarify the actual wall thickness of the pipe string. By setting two electromagnetic flaw detection modules 7, which are symmetrically distributed and linearly distributed on different segments of the detection device, the detection efficiency and accuracy are effectively improved.

[0029] More preferably, the casing-in-casing and lower-casing friction resistance detection device is of a hollow structure, and a one-way valve is provided at the hollow structure of the drill bit mechanism. The one-way valve can control the fluid to flow unidirectionally from the first pipe body 1 to the drill bit mechanism and flow out from the drill bit mechanism, so that the fluid can carry out the impurities generated during the drilling process and then discharge them from the well, avoiding excessive impurities from polluting the device.

[0030] Embodiment 6 A method for detecting the friction resistance of casing-in-casing and lower-casing uses the detection device of the present invention and includes the following steps: S1: Lower the casing-in-casing and lower-casing friction resistance detection device into the original wellbore for wellbore detection. The detection device advances along the wall. During the lowering process, the drill bit mechanism clears the dirt on the wellbore wall. In the horizontal section, the fourth pipe body 4 and the weight pipe fitting 10 are driven to rotate through the second meshing and rotating assembly, so as to drive the drill bit for compound drilling and improve the wellbore cleaning efficiency; S2: Calculate the friction resistance of the casing-in-casing and lower-casing according to the value measured by the friction resistance detection assembly 81. For different working conditions, the calculation is as follows: I. For the conventional casing-lowering working condition, the following formula (1) is used to calculate the friction resistance of the casing-in-casing and lower-casing: (1), Wherein, F h is the friction resistance when the casing is lowered to the well depth h in the casing-in-casing and lower-casing under the conventional casing-lowering working condition, and the unit is KN; h is the test well depth, and the unit is m; i is the well depth of the contact point of the friction resistance detection assembly 81 during the detection process, and the value ranges from 1 toh , in meters; v c is the lowering speed of the casing when casing is inserted and fixed, in m / s; r c is the outer diameter of the casing when casing is inserted and fixed, in mm; M i is the value of the force at the well depth tested by the friction resistance detection component 81 provided on the second pipe body 2 i , in KN; v 1 is the lowering speed of the friction resistance detection device, in m / s; r 1 is the outer diameter of the friction resistance detection component 81 provided on the second pipe body 2 in the natural state, in mm; k is the well deviation gravity coefficient, dimensionless; when the well deviation angle is 0 k the value is 1; when the well deviation angle is not 0 k the value is , where G c is the linear weight of the casing during casing insertion and fixation construction G 1 is the linear weight of the friction resistance detection device for casing insertion and fixation while lowering the casing, and the units of both are kg / m; II. For the case of rotating the casing while lowering, the third pipe body 3 is driven to rotate circumferentially by the first meshing rotation component, thereby driving the friction resistance detection component 81 thereon to rotate. The following formula (2) is used to calculate the friction resistance of casing insertion and fixation while lowering the casing: (2) In the formula: N h is the friction resistance when the casing is lowered to the well depth h during casing insertion and fixation while lowering the casing under the condition of rotating the casing while lowering, in KN; n c is the rotation speed of the rotating casing during casing insertion and fixation construction, in r / min; n 1 is the rotation speed of the friction resistance detection component 81 provided on the third pipe body 3, in r / min; r 2 is the outer diameter of the friction resistance detection component 81 provided on the third pipe body 3 in the natural state, in mm; P iThe value of the force at the well depth tested by the friction resistance detection component 81 provided on the third pipe body 3, with the unit of kN.

[0031] Embodiment 7 Select a horizontal well WYJ-3 in a low-permeability oilfield in the west, test the conventional casing running condition of the device described in Embodiment 5 of the present invention, and conduct a comparative experiment with the actual casing condition. The test running-in depth is 600 m (including the horizontal section of 120 m). The kick-off point of this well is 210 m (that is, when the well depth is less than or equal to 210 m, the well deviation angle is 0, and when the well depth is greater than 210 m, the well deviation angle is not 0). The density of the liquid in the well before casing running is 1.05 g / cm 3 , and the inner diameter of the production casing of this well is 124.26 mm. The actual casing run in is a 101.6 mm non-coupling casing (that is, r c = 101.6 mm), and the linear weight ( G c ) is 16.38 kg / m.

[0032] Use the device described in Embodiment 5 of the present invention to test the friction resistance of casing running in this well, mainly relying on the friction resistance detection component 81 on the second pipe body 2. Its linear weight ( G 1) is 9.24 kg / m, the outer diameter in the natural state r 1 is 101.6 mm, the accuracy of the pressure sensor 818 is 1 N, the motor carried by the device is a turbine motor, the data acquisition method is downhole storage type, and the contact wheel 817 on the friction resistance detection component 81 is fixed. The test condition is conventional casing running, so the friction resistance detection component 81 on the third pipe body 3 remains stationary. Specifically as follows: S1: Connect the device of the present invention to the tubing and lower it from the wellhead of this well to the bottom of the well (the test well depth h is 600 m). The running-in speed of the pipe string v 1 is the running-in speed of 0.3 m / s during the actual running-in process of the non-coupling casing in the later stage (that is, v c , v 1 are both 0.3 m / s). During the process of the detection device advancing while adhering to the wall, the dirt on the wellbore wall is cleaned by the drill bit mechanism. In the horizontal section, the fourth pipe body 4 and the weight member 10 are driven to rotate circumferentially through the second meshing and rotating assembly, so as to drive the drill bit for compound drilling. The maximum rotation speed of the drill bit mechanism is controlled within 30 r / min; S2: Calculate the friction resistance of the casing running with the solid sleeve in the casing through formula (1). The values of the forces tested by the friction resistance detection component 81 provided on the second pipe body 2 corresponding to each contact point at different well depths are shown in Figure 5, according to formula (1), the friction resistance of the casing in the casing under normal conditions can be calculated. Among them, when the well depth is less than or equal to 210m (kick-off point), k the value is 1, and when the well depth is greater than 210m, k the value is: k = =16.38 / 9.24 = 1.77, and the calculation results are shown in Figure 6 ; collect the friction resistance of each section during the casing running process under actual working conditions, and the comparison results are shown in Figure 6 . It can be seen from Figure 6 that the device of the present invention can test the friction resistance under normal working conditions, and compared with the actual situation, the error is small. The technology of the present invention is close to the actual situation on site, with good accuracy and can meet the on-site needs. At the same time, the successful running of the casing also shows that while the device is testing, it can also clean the dirt in the old wellbore, ensuring the safe running of the later casing.

[0033] Example 8 Select another horizontal well KL-7 in a low-permeability oilfield in the west to test the rotating casing running condition of the device of the present invention and conduct a comparative experiment with the casing under actual working conditions. The test running depth is 600m (including the horizontal section of 101m). The kick-off point of this well is 260m (that is, when the well depth is less than or equal to 260m, the well inclination angle is 0, and when the well depth is greater than 260m, the well inclination angle is not 0). The density of the liquid in the well before running the casing is 1.07g / cm 3 , and the inner diameter of the production casing of this well is 124.26mm. The casing actually run in is a non-coupling casing with an outer diameter of 114.3mm (that is, r c = 114.3mm), the linear weight ( G c ) is 17.26kg / m, and the rotation speed is 12r / min ( n c ).

[0034] Use the device described in Example 5 of the present invention to test the friction resistance of the rotating casing running in this well, mainly relying on the friction resistance detection component 81 on the third pipe body 3. Its rotation speed is 10r / min ( n 1), its linear weight ( G 1) is 9.24kg / m, the outer diameter r 2 in the natural state is 101.6mm, the accuracy of the pressure sensor 818 is 1N, the motor carried by the device is a turbine motor, the data acquisition method is downhole storage type, and the contact wheel 817 on the friction resistance detection component 81 is fixed, specifically as follows: S1: Connect the device of the present invention to the tubing and lower it from the wellhead of this well to the bottom of the well (the test well depth h is 600m), and the pipe string running speedv 1 is the running-in speed of the collarless casing during the actual running-in process, which is 0.3 m / s (i.e., v c 、 v 1 is all 0.3 m / s). During the process of the detection device advancing while adhering to the wall, the drill bit mechanism clears the dirt on the wellbore wall. In the horizontal section, the fourth pipe body 4 and the weight member 10 are driven to rotate circumferentially by the second meshing and rotating assembly, so as to drive the drill bit for compound drilling. The maximum rotational speed of the drill bit mechanism is controlled at 30 r / min; S2: The third pipe body 3 is driven to rotate circumferentially by the first meshing and rotating assembly, so as to drive the friction resistance detection assembly 81 thereon to rotate. Its rotational speed is 10 r / min. The force values measured by the friction resistance detection assemblies 81 provided on the third pipe body 3 corresponding to each contact point at different well depths are shown in Figure 7 , and the friction resistance of the casing fixed in the casing during the rotation of the casing under the actual working conditions is calculated according to formula (2). Among them, when the well depth is less than or equal to 260 m k the value is taken as 1, and when the well depth is greater than 260 m k the value is taken as: k = =17.26 / 9.24 = 1.87. The calculation results are shown in Figure 8 ; The friction resistance of each section during the rotation of the casing during the actual working conditions is collected, and the comparison results are shown in Figure 8 . It can be seen from Figure 8 that the device of the present invention can test the friction resistance under the condition of rotating the casing into the well, and compared with the actual situation, the error is small. The technology of the present invention is close to the actual situation on site, has good accuracy, and can meet the on-site needs.

Claims

1. A device for detecting friction resistance of casing in a casing-in-casing system, characterized in that: It comprises a first tube body, a second tube body, a third tube body, a fourth tube body, a weighted tube, a fifth tube body and a drill mechanism which are connected in sequence; The second tube body and the third tube body are rotationally connected via a first meshing rotation assembly that drives the third tube body to rotate circumferentially; the third tube body and the fourth tube body are rotationally connected via a second meshing rotation assembly that drives the fourth tube body to rotate circumferentially; The second tube body and the third tube body are both provided with friction resistance detection components with the same structure, which are used to detect the friction resistance between the casing and the wellbore during the process of advancing against the wall.

2. The friction resistance detection device for the casing with an inner sleeve and a lower sleeve according to claim 1, wherein: The friction resistance detection assembly includes a mounting ring, a pressure sensor connected to the mounting ring, a second movable ring and a first movable ring; the mounting rings are respectively fixed on the corresponding tube bodies, and the first movable ring and the second movable ring are slidably arranged on the corresponding tube bodies; the pressure sensor and the second movable ring, and the second movable ring and the first movable ring are all connected through a spring; the mounting ring and the second movable ring, and the second movable ring and the first movable ring are all connected through a plurality of connecting rod assemblies distributed along the circumference of the second movable ring, and the connecting rod assemblies are located on the outside of the spring; the connecting rod assembly includes a first connecting rod and a second connecting rod, and the two ends of the first connecting rod and the second connecting rod that are close to each other are hingedly connected to the same contact wheel, and the two ends of the first connecting rod and the second connecting rod that are far away from each other are respectively hingedly connected to the mounting ring and the second movable ring, or the two ends of the first connecting rod and the second connecting rod that are far away from each other are respectively hingedly connected to the second movable ring and the first movable ring.

3. The friction resistance detection device for the casing with a fixed sleeve inside a sleeve according to claim 2, wherein: The first meshing rotating assembly includes a first connecting sleeve fixedly connected to the second tube body, a first external gear ring connected to the third tube body end is rotatably provided at the end of the first connecting sleeve, a first motor is also provided on the outer wall of the first connecting sleeve, and the output shaft of the first motor is connected to a first gear meshing with the first external gear ring and located in the same plane.

4. The friction resistance detection device for the casing under the fixed sleeve in the sleeve according to claim 3, characterized in that: The second meshing rotating assembly includes a second connecting sleeve fixedly connected to the third tube body, a second external gear ring connected to the end of the fourth tube body is rotatably provided at the end of the second connecting sleeve, a second motor is also provided on the outer wall of the second connecting sleeve, and the output shaft of the second motor is connected to a second gear meshing with the second external gear ring and located in the same plane.

5. The friction resistance detection device for the casing with a fixed sleeve inside a casing according to claim 1, wherein: The drill bit mechanism includes a connecting shaft and a mounting seat which are connected in sequence with the fifth tube body; the outer wall of the mounting seat is evenly distributed with a plurality of rectangular grooves in the circumferential direction; transmission shafts connected by a conveyor belt are respectively arranged at both ends of the rectangular groove; and the outer wall of the conveyor belt is evenly provided with drilling heads; a plurality of third motors corresponding to the number of rectangular grooves are also arranged on the mounting seat, and the output shaft of each third motor is connected to one of the transmission shafts in the rectangular groove; the transmission direction of the conveyor belt is parallel to the forward direction of the drill bit.

6. The friction resistance detection device for the inner sleeve and the outer casing during casing running according to claim 5, characterized in that: Four groups of boring heads are evenly arranged on the outer wall of the conveyor belt along the circumference of the mounting seat, and the excavation parts of the two middle groups of boring heads face the connecting shaft, while the excavation parts of the two edge groups of boring heads face away from the connecting shaft.

7. A friction resistance detection device for a casing within a casing during casing running according to claim 6, wherein: A number of grooves corresponding to the number of rectangular grooves are further provided on the mounting base, and tunneling rollers are arranged in the grooves. The tunneling rollers are connected to a transmission shaft connected to a third motor through a mounting shaft, and the tunneling direction of the tunneling rollers is the same as the conveying direction of the conveyor belt.

8. The friction resistance detection device for the casing with a fixed sleeve inside a sleeve according to claim 1, characterized in that: Two electromagnetic flaw detection modules are symmetrically arranged on each of the first pipe body, the second pipe body, the third pipe body, the fourth pipe body, and the fifth pipe body.

9. A friction resistance detection device for a casing within a casing during casing running according to claim 1, characterized in that: The friction resistance detection device for the lower casing fixedly sleeved in the sleeve is of a hollow structure, and a one-way valve is arranged at the hollow structure of the drill bit mechanism.

10. A method for detecting the frictional resistance of the casing during the process of casing running inside a casing string, characterized in that: The detection is carried out by using the detection device according to any one of claims 1-9, and the method includes the following steps: S1: Lower the friction resistance detection device for the lower casing fixedly sleeved in the sleeve into the original wellbore to conduct the detection work of the wellbore. The detection device advances along the wall. During the lowering process, the drill bit mechanism cleans the dirt on the wall of the wellbore. In the horizontal section, the fourth pipe body and the weight pipe fitting are driven to rotate through the second meshing rotation assembly, so as to drive the drill bit to perform compound drilling. S2: Calculate the friction resistance of the lower casing fixedly sleeved in the sleeve according to the values measured by the friction resistance detection assembly. For different working conditions, the calculation is as follows:

1. For the conventional casing running condition, the following formula is used to calculate the friction resistance of the lower casing fixedly sleeved in the sleeve: ， Among them, F h is the frictional resistance when casing is lowered to the well depth during the normal casing running operation with a solid sleeve inside the casing. The unit is KN; h at this point, and the unit is KN; h For testing well depth, unit: m; i For the well depth of the contact point of the friction resistance detection component during the detection process, the value ranges from 1 to h , with the unit of m; v c is the lowering speed of the casing when casing string is run in hole with centralizer, unit: m / s; r c is the outer diameter of the casing when casing is installed in the centralizer and fixed casing, with the unit of mm; M i The well depth for testing the friction resistance detection component provided on the second pipe body i The value of the force at, in KN; v 1 is the lowering speed of the friction resistance detection device, with the unit of m / s; r 1 is the outer diameter of the friction resistance detection component provided on the second tube body in the natural state, with the unit of mm; k is the well deviation gravity coefficient, dimensionless; when the well deviation angle is 0 k the value is 1; when the well deviation angle is not 0 k the value is , where G c is the linear weight of the casing during the casing-in-casing construction, G 1 is the linear weight of the casing friction resistance detection device for the casing-in-casing, and the units of both are kg / m; 2. For the rotating casing running condition, the third pipe body is driven to rotate circumferentially through the first meshing rotation assembly so as to drive the friction resistance detection assembly thereon to rotate. The following formula is used to calculate the friction resistance of the lower casing fixedly sleeved in the sleeve: ， Among them, N h is the frictional resistance when the casing is lowered to the well depth h during the operation of rotating and lowering the casing with a fixed sleeve in the casing, in KN; n c is the rotation speed of the casing when the casing is inserted into the fixed casing during construction, with the unit of r / min; n 1 is the rotational speed of the friction resistance detection component provided on the third pipe body, with the unit of r / min; r 2 is the outer diameter of the friction resistance detection component provided on the third pipe body in the natural state, with the unit of mm; P i The well depth for testing the friction resistance detection component provided on the third pipe body i The value of the force at this point, in KN.

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