Extended reach horizontal well survey tool pumping system

Abstract

The application discloses a large displacement horizontal well depth correction tool pumping system, which comprises a short section pumping assembly and a detection control assembly, the short section pumping assembly comprises a hydraulic pump, a winch, a variable-diameter pumping short section and a depth correction tool, the winch is used for putting a cable into a horizontal well pipe, the cable is connected with the variable-diameter pumping short section, the hydraulic pump is used for delivering pumping liquid to the horizontal well pipe, the diameter of the variable-diameter pumping short section can be set, the detection control assembly comprises a tension detection module, a flow measurement module and a controller, the tension detection module is used for detecting the tension of the cable, the controller is in communication connection with the tension detection module, the winch, the hydraulic pump and the variable-diameter pumping short section, and the rotation speed of the winch, the diameter of the pumping short section and the flow of the hydraulic pump are adjusted according to the real-time tension of the cable, dynamic balance control of the tension of the cable is realized, the control process can be automatically carried out, human operation errors and pumping pressure are obviously reduced, and the automation level and safety of the depth correction tool pumping operation are improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of drilling technology, and particularly relates to a pumping system of a large displacement horizontal well depth correction tool. BACKGROUND

[0002] Perforation completion is widely used in shale gas reservoir and low permeability reservoir development at home and abroad, and depth correction positioning is a key link of perforation operation. In the depth correction positioning ring, the depth correction tool needs to be lowered to the horizontal well bore pipe, and for the lowering of the depth correction tool in the ultra-deep well large displacement horizontal well section, the pumping mode needs to be used to drive the depth correction tool to move. The pumping process is mainly affected by the pumping displacement and the cable lowering speed, and the two must be coordinated to ensure the safe lowering of the tool.

[0003] For the pumping operation of the depth correction tool in the large displacement horizontal well, in order to reduce the difficulty of lowering the conveying drill string and reduce the hanging load of the whole drill string, a combined drill string design of "large diameter upper section + small diameter lower section" is often used. This makes the depth correction tool need a higher pumping displacement in the rough drill pipe to ensure sufficient impact force, and the circulating pressure consumption of the pumping fluid through the fine drill pipe and the annulus will be significantly increased, thereby causing the ground pumping pressure to be too high, which brings potential risks to the safety of the pumping operation. At present, the control of the pumping displacement and the cable lowering speed depends on the subjective judgment of the workers according to experience, which has higher requirements for the workers. If the displacement is too high and the cable is not lowered in time, the cable will be under greater stress, and if it exceeds a certain range, the cable will be damaged or even broken. On the contrary, if the lowering speed is too high, the cable will be accumulated and wound in the well, which is easy to cause downhole accidents. SUMMARY

[0004] In view of the above defects or deficiencies, the present application provides a large displacement horizontal well depth correction tool pumping system, which aims to solve the technical problems that the pumping displacement and the cable lowering speed in the existing depth correction tool pumping link depend on manual control, have low reliability, and are easy to cause safety accidents. Moreover, the system increases the diameter of the pumping short section in the rough drill pipe to reduce the pumping flow, thereby achieving the purpose of significantly reducing the pumping pressure.

[0005] To achieve the above purpose, the present application provides a large displacement horizontal well depth correction tool pumping system, which comprises:

[0006] The short section pumping assembly comprises a hydraulic pump, a winch and a variable-diameter pumping short section. The winch is used to lower the cable into the horizontal well bore pipe, the cable is connected with the variable-diameter pumping short section, the variable-diameter pumping short section is connected with the depth correction tool through threads, the hydraulic pump is used to deliver pumping fluid to the horizontal well bore pipe to drive the variable-diameter pumping short section to move along the horizontal well bore pipe, and the diameter of the variable-diameter pumping short section is variable.

[0007] The detection control assembly comprises a flow detection module, a tension detection module and a controller, the tension detection module is used for detecting the tension of the cable, the controller is in communication connection with the hydraulic pump, the winch, the tension detection module and the variable-diameter pumping short section, and is configured to control the hydraulic pump to adjust the flow, control the winch to adjust the rotating speed and control the variable-diameter pumping short section to adjust the diameter according to the real-time tension of the cable.

[0008] In the embodiment of the present application, the variable-diameter pumping short section comprises a short section body, a fan blade and a fan blade driving member, the short section body is connected with the cable, a fan blade accommodation space for accommodating the fan blade is formed on the circumferential side of the short section body, the fan blade driving member is used for driving the fan blade to extend or retract in the fan blade accommodation space along the radial direction of the short section body, the controller is in communication connection with the fan blade driving member, and the controller controls the variable-diameter pumping short section to adjust the diameter according to the real-time tension of the cable, which comprises: controlling the fan blade driving member to adjust the extension amount of the fan blade according to the real-time tension of the cable, so as to adjust the diameter of the variable-diameter pumping short section.

[0009] In the embodiment of the present application, the fan blade driving member is an electric motor, the short section body is sleeved on the rotating shaft of the electric motor and comprises a fixed disc part and a rotating disc part which are arranged in sequence along the rotating shaft, the fixed disc part is connected with the shell of the electric motor and forms the fan blade accommodation space, the rotating disc part is connected with the key groove of the rotating shaft and is formed with a sliding groove, the sliding groove is curved and extends inward from the edge of the rotating disc part, a sliding rod is arranged in the sliding groove, and the sliding rod is connected with the fan blade.

[0010] In the embodiment of the present application, the diameter of the fixed disc part is greater than the diameter of the rotating disc part, and the circumferential sides of the fixed disc part and the shell are both formed with a connecting groove, a plurality of short section bodies are sleeved on the rotating shaft, and the variable-diameter pumping short section further comprises a connecting strip assembly, the connecting strip assembly is formed with a connecting part corresponding to each connecting groove, and the connecting part is used for embedding into the connecting groove.

[0011] In the embodiment of the present application, the circumferential side of each fixed disc part is formed with at least two fan blade accommodation spaces which are arranged in the circumferential direction of the fixed disc part and are spaced apart, and the fan blade accommodation spaces on the adjacent two fixed disc parts are arranged in a staggered manner.

[0012] In the embodiment of the present application, the number of the variable-diameter pumping short sections is multiple, and the multiple variable-diameter pumping short sections are arranged in sequence and are spaced apart along the cable.

[0013] In the embodiment of the present application, the controller controls the hydraulic pump to adjust the flow, controls the winch to adjust the rotating speed and controls the variable-diameter pumping short section to adjust the diameter according to the real-time tension of the cable, which comprises:

[0014] The real-time tension of the cable is determined through the tension detection module;

[0015] In the case that the real-time tension is less than the minimum preset safety value, a target tension is determined;

[0016] determine the target displacement, the target rotating speed and the target diameter according to the target tension and a target tension calculation formula;

[0017] adjust the hydraulic pump to the target displacement, adjust the winch to the target rotating speed, and adjust the variable-diameter pumping sub to the target diameter;

[0018] wherein the target tension is greater than a minimum preset safety value and less than a maximum preset safety value; and the target tension calculation formula is:

[0019] wherein, F 张 the target tension, Q the target displacement, p the density of the pumped liquid, D 1 the target diameter, D 2 the inner diameter of the horizontal wellbore drill pipe (6), L the length of the pumping tool string composed of the variable-diameter pumping sub (4) and the depth calibration tool (5), μ the viscosity of the pumped liquid, v the pumping speed, M the mass of the pumping tool string, g is the acceleration of gravity, V the volume of the pumping tool string, f the friction coefficient between the pumping tool string and the drill pipe, θ the inclination angle of the drill pipe where the pumping tool string is located.

[0020] In the embodiment of the present application, after adjusting the hydraulic pump to the target displacement, adjusting the winch to the target rotating speed, and adjusting the variable-diameter pumping sub to the target diameter, the method further comprises:

[0021] determining the real-time tension of the cable again through the tension detection module;

[0022] if the real-time tension is less than the minimum preset safety value and the variable-diameter pumping sub reaches the maximum diameter, reducing the rotating speed of the winch and / or increasing the displacement of the hydraulic pump.

[0023] In the embodiment of the present application, the controller is in communication connection with the hydraulic pump, and after determining the real-time tension of the cable through the tension detection module, the method further comprises:

[0024] if the real-time tension is greater than the maximum preset safety value, reducing the displacement of the hydraulic pump.

[0025] In the embodiment of the present application, a displacement sensor is further arranged on the variable-diameter pumping sub, the displacement sensor is used for detecting the displacement value of the variable-diameter pumping sub, the controller is in communication connection with the displacement sensor and the hydraulic pump, and after determining the real-time tension of the cable through the tension detection module, the method further comprises:

[0026] determining a change value of the cable tension within a preset time length;

[0027] in the case that the change value is greater than the maximum preset change value and the displacement value of the variable-diameter pumping short section remains constant, controlling the variable-diameter pumping short section to shorten the diameter and controlling the hydraulic pump to increase the displacement.

[0028] By means of the above technical solution, the large-displacement horizontal well depth correction tool pumping system provided by the embodiment has the following beneficial effects:

[0029] When the large-displacement horizontal well depth correction tool pumping system is used to perform the depth correction tool pumping operation, the hydraulic pump transmits the pumping fluid to the horizontal well bore pipe to generate an impact force on the variable-diameter pumping short section to drive the depth correction tool to move along the horizontal well bore pipe, the winch is synchronously matched to pay out the cable into the horizontal well bore pipe, the flow detection module detects the output flow of the hydraulic pump in real time and sends the detection result to the controller, the tension detection module detects the tension of the cable in real time and sends the detection result to the controller, under normal circumstances, the tension of the cable is maintained within the set working range, at this time, the diameter of the variable-diameter pumping short section is maintained at the initial value, when the moving speed of the variable-diameter pumping short section and the paying-out speed of the winch are not matched, the tension of the cable will abnormally fluctuate, the controller adjusts the diameter of the variable-diameter pumping short section, the flow of the hydraulic pump and the rotating speed of the winch according to the real-time tension of the cable, so that the tension of the cable is restored to the working range, and the safety of the depth correction tool pumping operation is ensured. The large-displacement horizontal well depth correction tool pumping system of the present application realizes dynamic balance control of the cable tension through automatic adjustment of the diameter of the variable-diameter pumping short section and the flow of the hydraulic pump, effectively avoids the risk of cable breakage caused by excessive tension or cable winding caused by too small tension, and the control process can be automatically performed without manual intervention, significantly reducing human operation errors and improving the automation level and safety of the depth correction tool pumping operation.

[0030] Other features and advantages of the present application will be described in detail in the following detailed description. BRIEF DESCRIPTION OF DRAWINGS

[0031] The accompanying drawings are included to provide a further understanding of the present application, and constitute a part of the specification, illustrate embodiments of the present application and explain the principles of the present application together with the detailed description, but do not limit the present application. In the drawings:

[0032] Figure 1 is a schematic diagram of a large-displacement horizontal well depth correction tool pumping system according to an embodiment of the present application;

[0033] Figure 2 is a schematic diagram of a variable-diameter pumping short section according to an embodiment of the present application;

[0034] Figure 3 is a schematic view of a short section body according to an embodiment of the present application;

[0035] Figure 4 is a control flow chart according to an embodiment of the present application.

[0036] BRIEF DESCRIPTION OF DRAWINGS

[0037] 1, controller; 2, winch; 3, hydraulic pump; 4, variable-diameter pumping short section; 41, short section body; 411, fixed disc part; 412, rotating disc part; 413, connecting groove; 414, sliding groove; 415, sliding rod; 416, fan blade accommodating space; 42, fan blade; 43, fan blade driving member; 44, connecting strip; 45, adapter connector; 5, depth calibration tool; 6, horizontal wellbore drill pipe; 7, flow detection module; 8, tension detection module. DETAILED DESCRIPTION

[0038] The specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely intended to illustrate and explain the present application, and are not intended to limit the present application.

[0039] The following description refers to the accompanying drawings. Figures 1 to 4 A depth calibration tool pumping system for extended reach horizontal wells is described.

[0040] The present application provides a depth calibration tool pumping system for extended reach horizontal wells, comprising:

[0041] The short section pumping assembly comprises a hydraulic pump 3, a winch 2 and a variable-diameter pumping short section 4. The winch 2 is used to launch a cable into the horizontal wellbore drill pipe 6, the cable is connected with the variable-diameter pumping short section 4, the variable-diameter pumping short section 4 is connected with the depth calibration tool 5 through a threaded connection, the hydraulic pump 3 is used to deliver pumping fluid to the horizontal wellbore drill pipe 6 to drive the variable-diameter pumping short section 4 to move along the horizontal wellbore drill pipe 6, thereby pushing the depth calibration tool 5 to be lowered to a designated depth position. The diameter of the variable-diameter pumping short section 4 is variable.

[0042] The detection control assembly comprises a flow detection module 7, a tension detection module 8 and a controller 1. The tension detection module 8 is used to detect the tension of the cable. The controller 1 is communicatively connected with the hydraulic pump 3, the winch 2, the tension detection module 8 and the variable-diameter pumping short section 4, and is configured to control the hydraulic pump 3 to adjust the flow rate, control the winch 2 to adjust the rotational speed, and control the variable-diameter pumping short section 4 to adjust the diameter according to the real-time tension of the cable.

[0043] When the deep correction tool pumping operation is performed by using the large displacement horizontal well deep correction tool pumping system, the hydraulic pump 3 delivers the pumping fluid to the horizontal well pipe 6 to drive the variable-diameter pumping sub 4 to move along the horizontal well pipe 6, the winch 2 is synchronously matched to lower the cable into the horizontal well pipe 6, the tension detection module 8 detects the tension of the cable in real time and sends the detection result to the controller 1, under normal circumstances, the tension of the cable will be maintained within the set working range, at this time, the diameter of the variable-diameter pumping sub 4 is maintained at the initial value, when the moving speed of the variable-diameter pumping sub 4 and the paying-off speed of the winch 2 are not matched, the tension of the cable will abnormally fluctuate, the controller 1 adjusts the diameter of the variable-diameter pumping sub 4, the rotating speed of the winch 2 and the flow of the hydraulic pump 3 according to the real-time tension of the cable, so that the tension of the cable is restored to the working range, and the safe performance of the deep correction tool pumping operation is ensured. The large displacement horizontal well deep correction tool pumping system can realize dynamic balance control of the cable tension by automatically adjusting the diameter of the variable-diameter pumping sub 4 and the flow of the hydraulic pump, effectively avoid the risk of cable breakage caused by excessive tension or cable winding caused by too small tension, and the control process can be automatically performed without manual intervention, which significantly reduces the human operation error and improves the automation level and safety of the deep correction tool pumping operation.

[0044] Specifically, the tension detection module 8 includes a fixed pulley, a bracket and a tension sensor, the cable lowered by the winch 2 first passes through the fixed pulley, the fixed pulley is fixed on the bracket, the bracket is connected with the tension sensor, and the tension of the cable is detected in real time according to the force transmission principle during the lowering process.

[0045] In addition, compared with the prior art, the variable-diameter pumping sub 4 also provides a new control method for the cable lowering speed, the greater the diameter of the variable-diameter pumping sub 4, the greater the resistance to the pumping fluid, so that the water flow is reasonably blocked to form a larger pressure to push the variable-diameter pumping sub 4 to advance, and the control of the hydraulic pump 3 and the winch 2 can more accurately and cooperatively regulate the moving speed of the variable-diameter pumping sub 4 in the horizontal well, so that the moving speed of the variable-diameter pumping sub 4 is always matched with the cable lowering speed, and the dynamic response performance and control accuracy of the deep correction tool pumping operation are further optimized.

[0046] In the embodiment of the present application, the variable-diameter pumping short section 4 comprises a short section body 41, a fan blade 42 and a fan blade driving member 43, the short section body 41 is connected with a cable, a fan blade accommodating space 416 is formed on the circumferential side of the short section body 41 for accommodating the fan blade 42, the fan blade driving member 43 is used to drive the fan blade 42 to extend or retract in the fan blade accommodating space 416 along the radial direction of the short section body 41, the controller 1 is in communication connection with the fan blade driving member 43, and the diameter adjustment of the variable-diameter pumping short section 4 according to the real-time tension of the cable comprises: controlling the fan blade driving member 43 to adjust the extension amount of the fan blade 42 according to the real-time tension of the cable, so as to adjust the diameter of the variable-diameter pumping short section 4. Then, by controlling the working stroke of the fan blade driving member 43, the extension length of the fan blade 42 along the radial direction of the short section body 41 can be accurately controlled, and then the precise adjustment of the overall outer diameter of the variable-diameter pumping short section 4 is realized. Specifically, when it is needed to increase the moving speed of the variable-diameter pumping short section 4, the controller 1 controls the fan blade driving member 43 to drive the fan blade 42 to extend outward from the fan blade accommodating space 416 by a longer distance, so as to increase the diameter of the variable-diameter pumping short section 4 to increase the resistance to the pumped liquid; on the contrary, when it is needed to reduce the moving speed of the variable-diameter pumping short section 4, the controller 1 controls the fan blade driving member 43 to drive the fan blade 42 to retract into the fan blade accommodating space 416, so as to shorten the extension amount of the fan blade 42 and reduce the diameter of the variable-diameter pumping short section 4 to reduce the resistance.

[0047] In the embodiment of the present application, the fan blade driving member 43 is arranged as a motor, the short section body 41 is sleeved on the rotating shaft of the motor and comprises a fixed disc part 411 and a rotating disc part 412 arranged in sequence along the rotating shaft, the fixed disc part 411 is connected with the shell of the motor and forms the fan blade accommodating space 416, the rotating disc part 412 is connected with the key groove of the rotating shaft and is formed with a sliding groove 414, the sliding groove 414 is curved and extends inward from the edge of the rotating disc part 412, a sliding rod 415 is arranged in the sliding groove 414, and the sliding rod 415 is connected with the fan blade 42. The rotating shaft of the motor drives the rotating disc part 412 to rotate, and the sliding rod 415 slides along the radial direction of the short section body 41 under the guidance of the sliding groove 414, so as to drive the fan blade 42 to extend or retract in the fan blade accommodating space 416. The extension amount of the fan blade 42 can be accurately controlled by the rotation angle of the motor, so as to realize the stepless adjustment of the diameter of the variable-diameter pumping short section 4.

[0048] Specifically, a motor rotor is arranged in the shell of the motor, the motor rotor is connected with a driving shaft, the driving shaft is provided with a driving gear, the rotating shaft of the motor is arranged as a driven shaft, the driven shaft is provided with a driven gear, and the driving gear is engaged with the driven gear to realize the transmission of power. Further, the diameter of the driven gear is larger than the diameter of the driving gear, by such gear transmission ratio design, the rotating speed of the driven shaft can be reduced and the torque of the driven shaft can be increased, so as to improve the control accuracy of the extension amount of the fan blade 42, reduce the impact in the extension and retraction process of the fan blade 42, and ensure the stability of the variable-diameter pumping short section 4.

[0049] Specifically, the fixed disc part 411 is provided with an auxiliary groove corresponding to the sliding groove 414 on the side facing the rotating disc part 412, one end of the sliding rod 415 is slidingly arranged in the sliding groove 414, and the other end is slidingly embedded in the auxiliary groove, the auxiliary groove and the sliding groove 414 jointly guide and limit the movement track of the sliding rod 415, preventing the sliding rod 415 from radially deviating or shaking during the driving of the fan blade 42, and further improving the stability and accuracy of the fan blade 42.

[0050] Specifically, a threaded segment is formed on a section of the sliding rod 415 away from the fan blade 42, and a nut is sleeved on the threaded segment. By screwing the nut, a pulling force can be applied to the sliding rod 415 and the fan blade 42 towards the rotating disc part 412, so that the fan blade 42 is attached to the side wall of the fan blade containing space 416, avoiding the shaking of the fan blade 42 under the action of the pumped liquid.

[0051] Of course, the present application is not limited to this, the fan blade driving part 43 is arranged as a telescopic structure arranged in the fan blade containing space 416, for example, a cylinder or a hydraulic cylinder directly drives the sliding rod 415 to drive the fan blade 42 to perform telescopic action, or a motor is used to cooperate with a screw nut mechanism to convert rotary motion into linear motion to realize position adjustment of the fan blade 42, which can also meet the basic functional requirements of the telescopic adjustment of the fan blade 42. However, in the preferred embodiment of the present application, the design of gear transmission combined with double disc guiding structure can effectively save the installation volume in the fan blade containing space 416 while ensuring the adjustment accuracy and movement stability of the fan blade 42, avoiding excessive occupation of the pumping channel, so as to ensure that the pumping efficiency is not significantly affected.

[0052] In the embodiment of the present application, a plurality of short sections 41 are sleeved on the rotating shaft, each short section 41 is provided with a fan blade containing space 416, so as to further increase the resistance to the pumped liquid and improve the pumping effect; and the rotating shaft can drive the fan blades 42 on the plurality of short sections 41 to move synchronously, ensuring the adjustment consistency between the fan blades 42 and improving the cooperative working efficiency of the overall pumping system.

[0053] Specifically, the diameter of the fixed disc part 411 is greater than the diameter of the rotating disc part 412, and the circumferential side of the fixed disc part 411 and the shell is formed with a connecting groove 413, and the variable-diameter pumping short section 4 further comprises a connecting strip assembly, the connecting strip assembly is formed with a connecting part corresponding to each connecting groove 413, the connecting part is used for embedding in the connecting groove 413, so as to realize the detachable fixed connection between the fixed disc part 411 and the shell, and between each fixed disc part 411, ensuring the structural stability of the variable-diameter pumping short section 4 during work.

[0054] Specifically, the variable-diameter pumping short section 4 further comprises an adapter joint 45, which is arranged on the two sides of the short section body 41 separately from the housing of the fan driving member 43, and is connected with the fixed disc part 411 of the short section body 41.

[0055] Further, each fixed disc part 411 is formed with at least two connecting grooves 413, and the connecting strip assembly comprises a plurality of connecting strips 44, each of which is formed with a connecting part at both ends, each of which is matched with a corresponding connecting groove 413, and the stable connection between the plurality of fixed disc parts 411 and between the fixed disc part 411 and the housing is realized by embedding the connecting parts at both ends of the connecting strip 44 into the connecting grooves 413 of the adjacent fixed disc part 411 or the connecting grooves 413 of the housing, respectively. The cross-sectional shape of the connecting groove 413 can be T-shaped, L-shaped or dovetail-shaped, and the shape of the connecting part is matched with the cross-sectional shape of the connecting groove 413 to prevent the connecting strip 44 from falling off during operation and ensure the reliability of the connection.

[0056] In the embodiment of the present application, the circumferential side of each fixed disc part 411 is formed with at least two fan accommodating spaces 416 arranged at intervals along the circumferential direction of the fixed disc part 411, and the fan accommodating spaces 416 on the adjacent two fixed disc parts are arranged in a staggered manner, so that the fans 42 on the adjacent short section bodies 41 are arranged in a staggered manner, thereby increasing the blocking effect on the pumped liquid. Specifically, the fans 42 on each short section body 41 are arranged in a staggered manner in sequence, so that the projection of the variable-diameter pumping short section 4 in the axial direction forms a complete circle, thereby covering the cross section of the drill pipe to the maximum extent. Specifically, the variable-diameter pumping short section 4 comprises four short section bodies 41, each of which is arranged with three fans 42, and the three fans 42 are arranged at intervals of 120°, wherein the numbers of the short section bodies 41 are one, two, three and four in sequence, the initial phase angle of the fan 42 on the first short section body 41 is 0°, the phase angle of the fan 42 on the second short section body 41 relative to the fan 42 on the first short section body 41 is staggered by 30°, the phase angle of the fan 42 on the third short section body 41 relative to the fan 42 on the second short section body 41 is staggered by 30°, and the phase angle of the fan 42 on the fourth short section body 41 relative to the fan 42 on the third short section body 41 is staggered by 30°, so that the projections of the fans 42 on the four short section bodies 41 in the axial direction of the variable-diameter pumping short section 4 together form a complete circle, thereby realizing the full coverage of the cross section of the drill pipe.

[0057] In the embodiment of the present application, the number of the variable-diameter pumping short sections 4 is multiple, and the multiple variable-diameter pumping short sections 4 are arranged at intervals along the cable in sequence, and the controller 1 can control the diameter of each variable-diameter pumping short section 4 individually, so as to flexibly adjust the resistance to the pumped liquid according to the actual working conditions of different well sections.

[0058] In the embodiments of the present application, the real-time tension of the cable is determined by the tension detection module 8, the flow rate of the hydraulic pump 3 is adjusted according to the real-time tension of the cable, the rotating speed of the winch 2 is adjusted, and the diameter of the variable-diameter pumping short section 4 is adjusted.

[0059] The real-time tension of the cable is determined by the tension detection module 8.

[0060] The target tension is determined when the real-time tension is less than the minimum preset safety value.

[0061] The target displacement, the target rotating speed and the target diameter are determined according to the target tension and the target tension calculation formula.

[0062] The hydraulic pump 3 is adjusted to the target displacement, the winch 2 is adjusted to the target rotating speed, and the variable-diameter pumping short section 4 is adjusted to the target diameter.

[0063] The target tension is greater than the minimum preset safety value and less than the maximum preset safety value, and the target tension calculation formula is:

[0064] In the formula, F 张 The target tension is T, Q The target displacement is Q, p The density of the pumped liquid is p, D The target diameter is D, D The inner diameter of the horizontal wellbore drill pipe 6 is d, L The length of the pumping tool string composed of the variable-diameter pumping short section 4 and the depth correction tool 5 is L, μ The viscosity of the pumped liquid is m, v The pumping speed (i.e., the target rotating speed of the winch) is V, M The mass of the pumping tool string is M, and g is the acceleration of gravity, V The volume of the pumping tool string is V, f The friction coefficient between the pumping tool string and the drill pipe is f, θ The inclination angle of the drill pipe where the pumping tool string is located is i.

[0065] It can be understood that when the real-time tension is less than the minimum preset safety value, the cable is in a slack state, which is prone to cause the cable to be wound and knotted in the well, which not only affects the normal progress of the depth correction tool pumping operation, but also may seriously threaten the safety of the entire extended reach horizontal well construction. By increasing the diameter of the variable-diameter pumping short section 4, the acting force between the variable-diameter pumping short section 4 and the pumped liquid can be effectively increased, so as to accelerate the movement of the variable-diameter pumping short section 4 and gradually increase the tension of the cable, so that the cable is restored to the safe working range, and the stability and reliability of the depth correction tool pumping system in the well are ensured.

[0066] It should be noted that the controller 1 can select to change one of the target diameter, the target rotating speed and the target displacement, or select to change two or three of them at the same time.

[0067] In the embodiment of the present application, after the control of the hydraulic pump 3 to adjust to the target displacement, the control of the winch 2 to adjust to the target rotating speed, and the control of the variable-diameter pumping sub 4 to adjust to the target diameter, the embodiment further comprises:

[0068] The real-time tension of the cable is determined again by the tension detection module 8.

[0069] In the case that the real-time tension is less than the minimum preset safety value and the variable-diameter pumping sub 4 reaches the maximum diameter, the winch 2 is controlled to reduce the rotating speed and / or the hydraulic pump 3 is controlled to increase the displacement.

[0070] It can be understood that if the inner diameter of the drill pipe is large, the variable-diameter pumping sub 4 still has a large gap with the inner wall of the drill pipe in the case that the variable-diameter pumping sub 4 reaches the maximum diameter, at which time the effect of the acting force between the variable-diameter pumping sub 4 and the pumping liquid is limited, which can cause the cable tension to still be difficult to recover to the safety range. In view of this, in the embodiment of the present application, after the control of the variable-diameter pumping sub 4 to reach the maximum diameter, if the real-time tension is still found to be less than the minimum preset safety value again by the tension detection module 8, a cooperative control strategy is further adopted, that is, the rotating speed of the winch 2 is controlled to reduce the lowering speed of the cable, and / or the displacement of the hydraulic pump 3 is controlled to increase the flow rate and flow of the pumping liquid. The reduction of the rotating speed of the winch 2 can reduce the lowering length of the cable per unit time, thereby avoiding the cable from being excessively relaxed; the increase of the displacement of the hydraulic pump 3 can significantly increase the pushing force of the pumping liquid on the variable-diameter pumping sub 4, thereby more effectively driving the variable-diameter pumping sub 4 to move in the drill pipe, so as to quickly increase the cable tension, so as to cope with the complex working conditions such as the excessively large inner diameter of the drill pipe, and ensure the continuous and safe pumping operation of the depth correction tool.

[0071] In the embodiment of the present application, the controller 1 is in communication connection with the hydraulic pump 3, and after the real-time tension of the cable is determined by the tension detection module 8, the embodiment further comprises:

[0072] In the case that the real-time tension is greater than the maximum preset safety value, the displacement of the hydraulic pump 3 is controlled to be reduced.

[0073] It can be understood that when the real-time tension is greater than the maximum preset safety value, the cable is over-tensioned, at this time the cable bears too much tension, which is easy to cause the cable to break and other damage due to overload, affecting the safety and reliability of the depth correction tool pumping operation. Therefore, the controller 1 controls the hydraulic pump 3 to reduce the displacement, which can reduce the flow rate and flow of the pumped liquid, and then reduce the pushing force of the pumped liquid on the variable-diameter pumping sub 4, so that the moving speed of the variable-diameter pumping sub 4 in the drill pipe is reduced, thereby weakening the tension of the cable and causing the real-time tension of the cable to fall back to the safety range, avoiding damage to the cable due to over-tensioning, and ensuring the stable development of the depth correction tool pumping operation. In addition, although selecting to reduce the diameter of the variable-diameter pumping sub 4 or to speed up the wire laying speed of the winch 2 can make the tension of the cable fall back, but selecting to reduce the displacement can achieve the additional effect of energy saving.

[0074] In the embodiment of the application, the variable-diameter pumping sub 4 is also provided with a displacement sensor, the displacement sensor is used to detect the displacement value of the variable-diameter pumping sub 4, the controller 1 is in communication connection with the displacement sensor and the hydraulic pump 3 respectively, and after the real-time tension of the cable is determined by the tension detection module 8, the following is further included:

[0075] determining the change value of the cable tension in the preset time length;

[0076] in the case that the change value is greater than the maximum preset change value and the displacement value of the variable-diameter pumping sub 4 remains constant, controlling the variable-diameter pumping sub 4 to shorten the diameter and controlling the hydraulic pump 3 to increase the displacement.

[0077] It can be understood that when the cable tension rapidly decreases and the variable-diameter pumping sub 4 remains stationary, it indicates that the variable-diameter pumping sub 4 has been trapped in a jammed state, that is, it has encountered a larger frictional resistance or an obstacle in the drill pipe, which causes it to be unable to continue to move along the preset path. In this case, the controller 1 needs to take timely measures, for example, controlling the variable-diameter pumping sub 4 to shorten the diameter to reduce the contact area with the inner wall of the drill pipe, thereby reducing the frictional resistance, and at the same time, controlling the hydraulic pump 3 to increase the displacement to increase the pushing force of the pumped liquid, helping the variable-diameter pumping sub 4 to get rid of the jammed area and restore normal movement, ensuring that the depth correction tool pumping operation can continue.

[0078] In the description of the present application, it should be understood that the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0079] In this application, unless otherwise clearly indicated, the terms "mounting", "connection", "connecting", "fixed", "fixedly connected" and the like should be understood in the broadest sense possible, such as it can be fixedly connected, detachably connected, or integral; it can be mechanical connection, or electrical connection, or communication with each other; it can be direct connection, or indirect connection via an intermediate medium; it can be the internal communication of two elements, or the interaction between two elements, unless otherwise clearly indicated. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0080] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in the present application and the features of the different embodiments or examples without contradiction.

[0081] Although the embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. A pumping system for a large-displacement horizontal well depth adjustment tool, characterized in that, The extended horizontal well depth correction tool pumping system includes: The short-section pumping assembly includes a hydraulic pump (3), a winch (2), and a variable-diameter pumping short section (4). The winch (2) is used to deploy a cable into the horizontal wellbore drill pipe (6). The variable-diameter pumping short section (4) is connected to the cable. The variable-diameter pumping short section (4) is threadedly connected to the depth calibration tool (5). The hydraulic pump (3) is used to deliver pumping fluid to the horizontal wellbore drill pipe (6) to drive the variable-diameter pumping short section (4) to move along the horizontal wellbore drill pipe (6), thereby pushing the depth calibration tool (5) down to the specified well depth position. The diameter of the variable-diameter pumping short section (4) can be set to be variable. The detection and control assembly includes a flow detection module (7), a tension detection module (8), and a controller (1). The tension detection module (8) is used to detect the tension of the cable. The controller (1) is connected to the hydraulic pump (3), the winch (2), the tension detection module (8), and the variable diameter pumping section (4) respectively, and is configured to: control the hydraulic pump (3) to adjust the flow rate according to the real-time tension of the cable, control the winch (2) to adjust the speed, and control the variable diameter pumping section (4) to adjust the diameter.

2. The pumping system for adjusting the depth of a large-displacement horizontal well according to claim 1, characterized in that, The variable diameter pumping sub (4) includes a sub body (41), a fan blade (42), and a fan blade drive (43). The sub body (41) is connected to the cable. The periphery of the sub body (41) is provided with a fan blade receiving space (416) for accommodating the fan blade (42). The fan blade drive (43) is used to drive the fan blade (42) to extend or retract into the fan blade receiving space (416) radially along the sub body (41). The controller (1) is communicatively connected to the fan blade drive (43). The process of adjusting the diameter of the variable diameter pumping sub (4) according to the real-time tension of the cable includes: adjusting the extension amount of the fan blade (42) according to the real-time tension of the cable by controlling the fan blade drive (43) to adjust the diameter of the variable diameter pumping sub (4).

3. The pumping system for adjusting the depth of large-displacement horizontal wells according to claim 2, characterized in that, The fan blade drive component (43) is configured as a motor. The short section (41) is sleeved on the rotating shaft of the motor and includes a fixed disk portion (411) and a rotating disk portion (412) arranged sequentially along the rotating shaft. The fixed disk portion (411) is connected to the housing of the motor and forms the fan blade accommodating space (416). The rotating disk portion (412) is connected to the keyway of the rotating shaft and forms a sliding groove (414). The sliding groove (414) extends inward from the edge of the rotating disk portion (412). A sliding rod (415) is inserted in the sliding groove (414), and the sliding rod (415) is connected to the fan blade (42).

4. The pumping system for adjusting the depth of large-displacement horizontal wells according to claim 3, characterized in that, The diameter of the fixed disc part (411) is larger than the diameter of the rotating disc part (412), and the fixed disc part (411) and the periphery of the housing are both formed with connecting grooves (413). A plurality of short sections (41) are sleeved on the rotating shaft. The variable diameter pumping short section (4) also includes a connecting strip assembly. The connecting strip assembly is formed with a connecting part corresponding to each connecting groove (413). The connecting part is used to be embedded in the connecting groove (413).

5. The pumping system for adjusting the depth of large-displacement horizontal wells according to claim 4, characterized in that, Each of the fixed disk portions (411) has at least two fan blade receiving spaces (416) arranged circumferentially along the fixed disk portion (411), and the fan blade receiving spaces (416) on two adjacent fixed disk portions (411) are staggered.

6. The pumping system for adjusting the depth of a large-displacement horizontal well according to any one of claims 1 to 5, characterized in that, The number of the variable diameter pumping sections (4) is multiple, and the multiple variable diameter pumping sections (4) are arranged sequentially at intervals along the cable.

7. The pumping system for adjusting the depth of a large-displacement horizontal well according to any one of claims 1 to 5, characterized in that, The process of adjusting the flow rate of the hydraulic pump (3) based on the real-time tension of the cable, adjusting the speed of the winch (2), and adjusting the diameter of the variable diameter pumping section (4) includes: The real-time tension of the cable is determined by the tension detection module (8); Determine the target tension when the real-time tension is less than the minimum preset safety value; The target displacement, target speed, and target diameter are determined based on the target tension and the target tension calculation formula. Control the hydraulic pump (3) to adjust to the target displacement, control the winch (2) to adjust to the target speed, and control the variable diameter pumping section (4) to adjust to the target diameter; The target tension is greater than the minimum preset safety value and less than the maximum preset safety value; the formula for calculating the target tension is: In the formula, F 张 The target tension, Q For the target displacement, ρ For the density of the pumped liquid, D 1 represents the diameter of the target. D 2 is the inner diameter of the horizontal wellbore drill pipe (6). L The length of the pumping tool string consisting of the variable diameter pumping section (4) and the depth adjustment tool (5) is given. μ The viscosity of the pumped fluid. v For pumping speed, M Let g be the mass of the pumping tool string, and g be the acceleration due to gravity. V The volume of the pumping tool string. f The coefficient of friction between the pumping tool string and the drill pipe. θ The well inclination angle of the drill pipe where the pumping tool string is located.

8. The pumping system for adjusting the depth of a large-displacement horizontal well according to claim 7, characterized in that, After adjusting the hydraulic pump (3) to the target displacement, the winch (2) to the target speed, and the variable diameter pumping sub (4) to the target diameter, the system further includes: The real-time tension of the cable is determined again by the tension detection module (8); When the real-time tension is less than the minimum preset safety value and the variable diameter pumping section (4) reaches its maximum diameter, control the winch (2) to reduce the speed and / or control the hydraulic pump (3) to increase the displacement.

9. The pumping system for adjusting the depth of a large-displacement horizontal well according to claim 7, characterized in that, After determining the real-time tension of the cable through the tension detection module (8), the process further includes: When the real-time tension is greater than the maximum preset safety value, control the hydraulic pump (3) to reduce the displacement.

10. The pumping system for adjusting the depth of a large-displacement horizontal well according to claim 7, characterized in that, A displacement sensor is also provided on the variable diameter pumping section (4). The displacement sensor is used to detect the displacement value of the variable diameter pumping section (4). The controller (1) is communicatively connected to the displacement sensor and the hydraulic pump (3). After determining the real-time tension of the cable through the tension detection module (8), the following is also included: Determine the change in cable tension within a preset time period; When the change value is greater than the maximum preset change value and the displacement value of the variable diameter pumping section (4) remains constant, the variable diameter pumping section (4) is controlled to shorten its diameter and the hydraulic pump (3) is controlled to increase its displacement.

Images