Horizontal well electric control packing dragging water exploration tubular column and method

Abstract

The invention discloses a horizontal well electric control packing dragging water exploration tubular column and method, and belongs to the technical field of oil production engineering.The water exploration tubular column comprises a tubular column body and a controller which are arranged in a separated mode, the tubular column body and the controller are independent of each other, so that a control system can be more flexible and easy to maintain, and the tubular column body and the controller are convenient to maintain and replace respectively; the maintenance cost is reduced; through the first electric control packer and the second electric control packer, the dragging water exploration function of the horizontal well dragging pipe column is achieved, packing water exploration is conducted on any well section in a horizontal well, operation is convenient, cost is low, repeated use can be achieved, the water exploration efficiency can be improved, the electric packers are good in packing effect, pressure control is more accurate, and the water exploration efficiency is improved. During installation, a worker does not need to spend more energy, repeated setting and unsetting can be directly carried out by pressing a switch, and the effect of saving manpower and time cost is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of oil production engineering, and in particular relates to a horizontal well electric-controlled isolation and dragging water-finding pipe column and a method. Background Art

[0002] In recent years, in the field of oil extraction, the Y211 and Y111 mechanical water-finding seals that can be repeatedly sealed in horizontal well sections have been developed, forming a double-seal and dragging tubing string water-finding technology for horizontal wells, solving the problem of water-finding in multi-stage fracturing horizontal wells.

[0003] However, the current horizontal well dragging string uses traditional mechanical packers. As the horizontal well production layer moves downward, the horizontal section of the horizontal well becomes longer and the number of reformed sections increases. The mechanical packer relies on the weight generated by lowering the hanging weight from the wellhead to set the packer. Affected by the friction and contact force between the string and the well wall under the complex wellbore structure of the horizontal well, there is a risk that the packer cannot be completely set and subsequent unsealing is difficult. Alternatively, some domestic and foreign oil service companies use electric packers or electric cable bridge plug setting tools for dragging strings for horizontal wells, and use ground cable power supply and electronic control to achieve the setting and unsealing of the packer and anchoring mechanism in the horizontal well. However, the use of ground cable wired connection power supply and electronic control cannot meet the requirements of segmented dragging water finding tests in horizontal well sections and efficient and repeated setting. Summary of the invention

[0004] In order to overcome the above-mentioned technical defects, the present invention provides a horizontal well electrically-controlled isolation and dragging water-finding pipe column and method, which can solve the technical problem that the existing electrically-controlled isolation device cannot meet the requirements of segmented dragging water-finding testing in horizontal wells and efficient and repeated isolation due to the use of cable wired connection.

[0005] In order to achieve the above object, the present invention adopts the following technical contents:

[0006] A horizontal well electric-controlled isolation dragging water-finding string, comprising a string body and a controller that are separately arranged;

[0007] The tubing string body comprises an oil pipe and an oil testing rubber sleeve, a first electric-controlled packer and a second electric-controlled separator which are sequentially connected to the oil pipe;

[0008] The first electrically controlled packer comprises a first setting mechanism, a first driving mechanism and a first electrically controlled mechanism connected in sequence;

[0009] The second electrically controlled separator comprises a second setting mechanism, a second driving mechanism and a second electrically controlled mechanism connected in sequence;

[0010] The controller is electrically connected to the first electric control mechanism and the second electric control mechanism at the same time.

[0011] Further, the pipe string body further includes a plug connected to the end of the tubing.

[0012] Further, the first driving mechanism includes a transmission mechanism, a motor, and a battery pack connected in sequence;

[0013] The transmission mechanism is connected to the first setting mechanism;

[0014] The motor and the battery pack are respectively connected to the first electronic control mechanism.

[0015] Further, the transmission mechanism includes a lead screw and a planetary reducer connected in sequence; the planetary reducer is connected to the output shaft of the motor; a nut is sleeved on the lead screw; the nut is fixedly connected to the rubber cylinder of the first setting mechanism.

[0016] Further, an over-current channel communicating with the tubing is provided inside the first electric control packer, and the ratio of the maximum equivalent over-current diameter to the minimum equivalent over-current diameter of the over-current channel is between 1.2 and 1.5.

[0017] Further, the first electric control packer includes a housing, and the first setting mechanism, the first driving mechanism, and the first electronic control mechanism are all arranged inside the housing;

[0018] The over-current channel is symmetrically arranged along the center line of the housing.

[0019] Further, a testing device is arranged between the first electric control packer and the second electric control separator for measuring the water cut, flow rate, and temperature parameters of the horizontal well section.

[0020] Further, the testing device includes a testing mechanism and a third electronic control mechanism connected electrically, and the third electronic control mechanism is wirelessly communicatively connected to the controller.

[0021] Further, the structures and dimensions of the first electric control packer and the second electric control separator are the same.

[0022] A working method of an electric control packer dragging and searching for water pipe string in a horizontal well, based on the above-mentioned electric control packer dragging and searching for water pipe string in a horizontal well, includes:

[0023] Lower the pipe string body to a specified position in the horizontal section of the target horizontal well; when the pipe string body reaches the preset position, the controller on the ground sends instructions to the first electronic control mechanism and the second electronic control mechanism respectively, so that the first electronic control mechanism controls the first driving mechanism to drive the first setting mechanism to set or release, and the second electronic control mechanism controls the second driving mechanism to drive the second setting mechanism to set or release.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The present invention provides a water-finding string for horizontal well electric control packer dragging, which includes a separate string body and a controller. The string body is located in the horizontal well downhole. Due to the action of underground depth, groundwater pressure and oil and gas pressure in the horizontal well downhole environment, the downhole environment is often in a state of high temperature, high pressure and high humidity. The controller is a precision electronic device and is easily damaged in the downhole environment of the horizontal well. At the same time, separating the string body from the controller that controls the string can make the string body and the controller independent of each other, making the control system more flexible and easy to maintain, facilitating their respective repair and replacement, and reducing the maintenance cost; when it is necessary to change the operation process of the horizontal well dragging string, only the controller needs to be modified, and timely and rapid adjustment can be achieved, which can better control the water-finding process and improve the water-finding effect. Through the first electric control packer and the second electric separator, the function of dragging and finding water for the horizontal well dragging string is realized, and any well section in the horizontal well can be isolated for water finding. The operation is convenient, the cost is low, it can be reused, the water-finding efficiency can be improved, and the sealing effect of the electric packer is good, the control pressure is more accurate. When installing, the staff does not need to spend much effort, and the switch can be pressed directly to perform repeated setting and releasing, saving the manpower and time costs.

[0026] Preferably, in the present invention, a plug is further provided at the end of the tubing of the string body. The plug is used to prevent substances in the well from entering the drilling pipeline or the wellbore, and at the same time allows the drill string to pass through. The plug can be composed of a series of mutually fused metal pipes with many small holes in the middle, which can allow liquids to pass through while preventing solid particles from entering the pipeline, effectively blocking and isolating foreign matters.

[0027] Preferably, in the present invention, the first driving mechanism includes a transmission mechanism, a motor and a battery pack connected in sequence. The battery pack can provide power for the motor and the first electric control mechanism, improving the reliability of the work.

[0028] Further preferably, the transmission mechanism adopts the connection structure of a lead screw and a planetary reducer. When the output shaft of the motor rotates, it drives the planetary reducer to drive the lead screw to rotate relative to the nut, so that the nut drives the rubber cylinder to move along the axial direction of the lead screw; the planetary reducer can adjust the reduction ratio to realize the lead screw rotating at a preset speed. A nut fixed to the rubber cylinder of the first setting mechanism is sleeved on the lead screw. This design has the advantages of compact structure, large transmission torque, high transmission accuracy, stable reduction ratio, good stability and high transmission efficiency, and can transfer motion smoothly and efficiently.

[0029] Preferably, in the present invention, an overcurrent channel communicating with the tubing is provided inside the first electric control packer. The overcurrent channel enables the liquid in the tubing to flow through the first electric control packer. Here, the ratio of the maximum equivalent overcurrent diameter to the minimum equivalent overcurrent diameter of the overcurrent channel is between 1.2 and 1.5. Here, considering the needs of liquid flow and the performance requirements of the overcurrent channel, an appropriate contraction ratio is selected to ensure that the liquid can pass through smoothly and stably.

[0030] Further preferably, in the present invention, the first electric control packer is also provided with a housing, and the overcurrent channel is symmetrically arranged along the center line of the housing. In this way, it can ensure that the liquid flow states on both sides of the overcurrent channel are basically the same, avoiding problems such as unstable liquid flow and pressure fluctuations caused by the asymmetry of the overcurrent channel.

[0031] Preferably, in the present invention, a testing device is provided between the first electric control packer and the second electric control separator, which can facilitate the real-time measurement of the water cut, flow rate, and temperature parameters of the water to be tested during the water finding process.

[0032] Preferably, in the present invention, the structures and dimensions of the first electric control packer and the second electric control separator are both set in the same way. In this way, it can facilitate the assembly and formation of this water finding pipe string, and at the same time reduce spare parts and save costs.

[0033] The present invention also provides a working method for a horizontal well electric control packer dragging water finding pipe string. Based on the above-mentioned horizontal well electric control packer dragging water finding pipe string, using this method can solve the problem that the existing electric control packer device cannot meet the requirements of sectional dragging water finding test and efficient multiple repeated setting in the horizontal well section. Through the wireless communication between the pipe string body and the controller, the operator can control the controller on the ground to send instructions to the pipe string body under the horizontal well, which can better control the water finding process, has the advantages of simple operation and high water finding efficiency, and can improve the operation efficiency and safety of the horizontal well; using this method realizes the automatic sealing and dragging water finding of the pipe string body, and the principle is simple and easy to operate and implement. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic structural diagram of a horizontal well electric control packer dragging water finding pipe string provided by an embodiment of the present invention;

[0035] Figure 2 It is a cross-sectional view of the first electric control packer of a horizontal well electric control packer dragging water finding pipe string provided by an embodiment of the present invention;

[0036] Figure 3 It is a schematic structural diagram of the transmission mechanism of the first electric control packer provided by an embodiment of the present invention;

[0037] Figure 4Schematic diagram of the contraction ratio of a water pipe finding string driven by an electric control packer in a horizontal well provided by an embodiment of the present invention; where (a) is a side sectional view; (b) is a sectional view taken along line A-A in (a); (c) is a sectional view taken along line B-B in (a); (d) is a sectional view taken along line C-C in (a); (e) is a sectional view taken along line D-D in (a).

[0038] Reference numerals:

[0039] 100, tubing; 200, testing rubber cylinder; 300, first electric control packer; 400, second electric control separator; 500, plug; 600, testing device;

[0040] 301, first setting mechanism; 302, first driving mechanism; 303, first electric control mechanism; 304, transmission mechanism; 305, battery pack; 306, motor; 307, housing; 308, overcurrent channel;

[0041] 3041, planetary reducer; 3042, lead screw; 3043, nut; 3011, rubber cylinder. Detailed implementation manners

[0042] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention clearer and more understandable, the following specific embodiments are used to further elaborate on the present invention in detail. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0043] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0044] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0045] It should be noted that: similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0046] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper", "lower", "horizontal", "inner", etc. are used to indicate the orientation or position relationship, it is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the invention product is usually placed during use. This is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. In addition, terms such as "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0047] In addition, if the term "horizontal" appears, it does not mean that the component is required to be absolutely horizontal, but it can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and it does not mean that the structure must be completely horizontal, but it can be slightly inclined.

[0048] In the description of the embodiments of the present invention, it should also be noted that unless otherwise clearly specified and limited, if terms such as "set", "installed", "connected", "connected" are used, they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0049] The following further describes the present invention in detail with reference to the drawings:

[0050] Embodiment

[0051] Combined with what is mentioned in the background art, the current mechanical packer relies on the weight applied by lowering the string weight at the wellhead for setting. Affected by the frictional force and contact force between the string and the wellbore under the complex wellbore structure of horizontal wells, there are risks such as the packer not being fully set and subsequent difficulty in releasing. Or use the electric packer or electric cable bridge plug setting tool for dragging the string in horizontal wells owned by some oil service companies at home and abroad, and adopt the ground cable power supply and electric control method to realize the setting and releasing of the packer and the anchoring mechanism in the horizontal well underground. However, using the ground cable wired connection power supply and electric control method cannot meet the requirements of sectional dragging water finding test and efficient multiple repeated setting in the horizontal well section.

[0052] In order to solve the above problems, this embodiment provides a horizontal well electric control packer dragging water finding string. By using this string, it is possible to complete efficient multiple repeated automatic packing and dragging water finding work at any position in the horizontal well.

[0053] The following details the specific structure of this embodiment with reference to the drawings:

[0054] As Figure 1 shown, this embodiment provides a water-finding string for electric control packer dragging in a horizontal well:

[0055] It includes a string body and a controller which are separately arranged. Among them, the string body includes a tubing 100, and a well testing rubber cylinder 200, a first electric control packer 300, a second electric control separator 400 and a nipple 500 which are sequentially arranged along the axial direction of the tubing 100.

[0056] As Figure 2 shown, among them, the first electric control packer 300 includes a first setting mechanism 301, a first driving mechanism 302 and a first electric control mechanism 303. The first driving mechanism 302 is electrically connected to the first electric control mechanism 303. The first setting mechanism 301 is mechanically connected to the first driving mechanism 302. The first electric control mechanism 303 is wirelessly communicatively connected to the controller. The second electric control separator 400 includes a second setting mechanism, a second driving mechanism and a second electric control mechanism. The second driving mechanism is electrically connected to the second electric control mechanism. The second setting mechanism is mechanically connected to the second driving mechanism. The second electric control mechanism is wirelessly communicatively connected to the controller.

[0057] In this embodiment, the horizontal well dragging string is a string for finding water by controlling the separately arranged string body in the horizontal well through a controller on the ground. The horizontal well dragging string can complete the water-finding operation in the horizontal well.

[0058] The string body is a string for finding water in the horizontal well, which can receive the instructions of the controller and complete the operations of water-finding. The specific operations that the string body can complete are not limited and can be reasonably selected according to actual application requirements. For example: operations such as the opening and closing state of the string body, the movement speed of the string body and the direction of the string body.

[0059] The controller can issue control instructions to control the string body, and can also receive signals such as the state and actions of the string body to better control the operation of the string body in the horizontal well. The specific types of the controller are not limited and can be reasonably selected according to actual application requirements.

[0060] The tubing 100 is a kind of pipeline for transporting oil and gas, also known as an oil well pipe or an oil well casing.

[0061] The well testing rubber cylinder 200 is a tool that can collect downhole petroleum samples, which can effectively avoid pollution and sample damage during the sampling process, and can also reduce the contact and risk of operators.

[0062] The first electric control packer 300 drives the first driving mechanism 302 through the first electric control mechanism 303 to control the operation of the first setting mechanism 301, so as to realize the setting and unseating of the first electric control packer 300, and realize the setting and unseating of the horizontal well section.

[0063] The second electrically controlled packer 400 drives the second driving mechanism through the second electrically controlled mechanism to control the operation of the second setting mechanism, so as to realize the setting and releasing of the second electrically controlled packer, and realize the isolation and release of the horizontal well section.

[0064] Specifically, the structures and sizes of the first electrically controlled packer 300 and the second electrically controlled packer 400 are not limited and can be reasonably selected according to actual application requirements. For example: the structures and sizes of the first electrically controlled packer 300 and the second electrically controlled packer 400 are the same; the sizes of the first electrically controlled packer 300 and the second electrically controlled packer 400 are the same, but the structures are different; the sizes of the first electrically controlled packer 300 and the second electrically controlled packer 400 are different, but the structures are the same. In this embodiment, the structures and sizes of the first electrically controlled packer 300 and the second electrically controlled packer 400 are set to be the same. Such a design can facilitate the assembly and formation of the water finding pipe string, while reducing spare parts and saving costs.

[0065] The pipe plug 500 is a device used in horizontal wells, mainly used to prevent substances in the well from entering the drilling pipe or wellbore, while allowing the drill string to pass through. The pipe plug 500 can be composed of a series of mutually fused metal pipes with many small holes in the middle, which can allow liquids to pass through while preventing solid particles from entering the pipe.

[0066] The first setting mechanism 301 is the structure in the first electrically controlled packer 300 that realizes setting, is mechanically connected to the first driving mechanism 302, and realizes setting and releasing through the first driving mechanism 302.

[0067] The first driving mechanism 302 is the driving device of the first electrically controlled packer 300, is electrically connected to the first electrically controlled mechanism 303, receives the signal of the first electrically controlled mechanism 303, makes the specified action of the signal, and provides power for the first setting mechanism 301.

[0068] The first electrically controlled mechanism 303 is the electrically controlled device of the first electrically controlled packer 300, receives and sends signals, is wirelessly communicatively connected to the controller, is controlled by the controller, and sends a signal to make the first driving mechanism 302 perform a specified movement.

[0069] The second setting mechanism is the structure in the second electrically controlled packer 400 that realizes setting, is mechanically connected to the second driving mechanism, and realizes the functions of setting and releasing through the power provided by the second driving mechanism.

[0070] The second driving mechanism is the driving device of the second electrically controlled packer 400, is electrically connected to the second electrically controlled mechanism, receives the signal of the second electrically controlled mechanism, makes the specified action of the signal, and provides power for the second setting mechanism.

[0071] The second electric control mechanism is the electric control device of the second electric control separator 400, which receives and sends signals, is wirelessly communicatively connected to the controller, is controlled by the controller, and sends signals to make the second drive mechanism perform a specified motion.

[0072] In this embodiment, it includes a pipe string main body and a controller that are separately arranged; wherein, the pipe string main body includes a tubing 100, and a well testing rubber cylinder 200, a first electric control packer 300, a second electric control separator 400, and a plug 500 that are sequentially arranged along the axial direction of the tubing 100. By separately arranging the pipe string main body and the controller, the pipe string main body is separated from the controller that controls the pipe string. The pipe string main body is located in the horizontal wellbore. Due to the action of underground depth, groundwater pressure, and oil and gas pressure in the horizontal wellbore environment, the underground environment is often in a state of high temperature, high pressure, and high humidity. The controller is a precision electronic device, and it is easily damaged in the environment of the horizontal wellbore. At the same time, separating the pipe string main body from the controller that controls the pipe string can make the pipe string main body and the controller independent of each other, which can make the control system more flexible and easier to maintain. If the pipe string main body and the controller malfunction, they can be repaired and replaced separately, reducing the maintenance cost. In addition, when it is necessary to change the operation process of dragging the pipe string in the horizontal well, only the controller needs to be modified, and it can be adjusted in a timely and rapid manner, which can better control the water finding process and improve the water finding effect. The pipe string main body includes a tubing 100, and a well testing rubber cylinder 200, a first electric control packer 300, a second electric control separator 400, and a plug 500 that are sequentially arranged along the axial direction of the tubing 100. The pipe string main body realizes automatic isolation and dragging water finding at any position in the horizontal well by sequentially arranging the well testing rubber cylinder 200, the first electric control packer 300, and the second electric control separator 400 along the axial direction of the tubing 100.

[0073] In this embodiment, the first electric control packer 300 includes a first setting mechanism 301, a first drive mechanism 302, and a first electric control mechanism 303. The first drive mechanism 302 is electrically connected to the first electric control mechanism 303. The first setting mechanism 301 is mechanically connected to the first drive mechanism 302. The first electric control mechanism 303 is wirelessly communicatively connected to the controller; the second electric control separator 400 includes a second setting mechanism, a second drive mechanism, and a second electric control mechanism. The second drive mechanism is electrically connected to the second electric control mechanism. The second setting mechanism is mechanically connected to the second drive mechanism. The second electric control mechanism is wirelessly communicatively connected to the controller. Through the first electric control packer 300 and the second electric control separator 400, the function of dragging water finding by dragging the pipe string in the horizontal well is realized, and any well section in the horizontal well can be isolated for water finding. The operation is convenient, the cost is low, it can be reused, the water finding efficiency can be improved, and the sealing effect of the electric packer is good, the control pressure is more accurate. When installing, the staff does not need to spend much effort. Pressing the switch can directly perform setting and unsealing, saving the labor and time costs.

[0074] The first electric control packer 300 includes a first setting mechanism 301, a first driving mechanism 302 and a first electric control mechanism 303. The first driving mechanism 302 is electrically connected to the first electric control mechanism 303. The first setting mechanism 301 is mechanically connected to the first driving mechanism 302. The first electric control mechanism 303 is wirelessly communicatively connected to the controller. The structure of the first electric control packer 300 is simple. The controller can communicate with the first electric control mechanism 303 in a wireless communication manner. The first electric control mechanism 303 can control the movement of the first driving mechanism 302 in an electric control manner. The first driving mechanism 302 can control the movement of the first setting mechanism 301 in a mechanical manner. Finally, through the movement of the first setting mechanism 301, the setting and unseating of the first electric control packer 300 are realized. The operation time of the setting and unseating actions is short, the setting effect is good, the operation reliability is high, and the operation is convenient. The structure and function of the second electric control separator 400 are similar to those of the first electric control packer 300.

[0075] For another example Figure 2 As shown, optionally, the horizontal well dragging string further includes a testing device 600 located between the first electric control packer 300 and the second electric control separator 400. Among them, the testing device 600 includes a testing mechanism and a third electric control mechanism which are electrically connected. The third electric control mechanism is wirelessly communicatively connected to the controller.

[0076] Among them, the horizontal well dragging string further includes a testing device 600 located between the first electric control packer 300 and the second electric control separator 400. By arranging the testing device 600 between the first electric control packer 300 and the second electric control separator 400, the horizontal well dragging string can collect the testing parameters of the horizontal well section in the well underground, such as sectional flow rate and water cut, etc., to solve the problems of long underground data acquisition period and large workload. At the same time, by dragging the horizontal well dragging string at the wellhead, the testing of parameters such as water cut and flow rate of different horizontal well sections can be realized, and the water-producing intervals in the main horizontal well sections can be clarified, providing data basis for subsequent operations such as water finding and water plugging. The testing device 600 includes a testing mechanism and a third electric control mechanism which are electrically connected. The third electric control mechanism is wirelessly communicatively connected to the controller. The testing mechanism is the mechanism for testing the horizontal well parameters of the testing device 600 and is controlled by the signal of the third electric control mechanism. The specific type of the mechanism is not limited and can be reasonably selected according to actual application requirements. For example: flow rate, water cut, temperature, etc. The third electric control mechanism is the mechanism for receiving the wireless communication of the controller. By receiving the wireless communication signal of the controller, it controls the testing operation of the testing mechanism. Through the testing mechanism and the third electric control mechanism of the testing device 600, the testing process can be controlled more flexibly.

[0077] Optionally, the structures and sizes of the first electric control packer 300 and the second electric control separator 400 are the same.

[0078] Among them, the first electric packer 300 and the second electric separator 400 have the same structure and dimensions, which simplifies the structure of the horizontal well dragging string, enables the first electric packer 300 and the second electric separator 400 to be easily assembled and formed, reduces spare parts at the same time, and saves costs.

[0079] For another example Figure 2 As shown, further, the first driving mechanism 302 of the first electric packer 300 further includes a transmission mechanism 304, a battery pack 305, and a motor 306; among them, the battery pack 305 is electrically connected to the motor 306 and the first electric control mechanism 303; the transmission mechanism 304 connects the output shaft of the motor 306 and the first setting mechanism 301.

[0080] Among them, the transmission mechanism 304 is a mechanical device that transmits the power of the motor 306 to the first setting mechanism 301, enabling the first setting mechanism 301 to operate normally. The battery pack 305 is a device that provides energy for the motor 306 and the first electric control mechanism 303, provides energy power for the motor 306 and the first electric control mechanism 303, and provides power for electronic devices and electrical appliances to meet the voltage and current required for their normal operation. The motor 306 is a device that converts the electrical energy of the battery pack 305 into mechanical energy. It can convert electrical energy into a rotational torque to drive various mechanical devices. By providing power to the motor 306 through the battery pack 305, the motor 306 can rotate forward and backward. Through the forward and backward rotation of the motor 306, the transmission mechanism 304 is driven to drive the first setting mechanism 301 to perform setting and releasing operations. Specifically, for example: the controller of the first electric packer 300 sends a signal to make the motor 306 rotate forward, thereby driving the transmission mechanism 304 to rotate, transmitting the rotational torque to the first setting mechanism 301, and enabling it to complete the setting operation. Conversely, when release is required, the controller will send a reverse signal to make the motor 306 rotate in reverse, thereby driving the transmission mechanism 304 to rotate in the reverse direction, transmitting the rotational torque to the first setting mechanism 301, and enabling it to complete the release operation. The above structure makes the setting and releasing operations of the first electric packer 300 more convenient and efficient.

[0081] As Figure 3 shown, further, the transmission mechanism 304 includes a planetary reducer 3041, a lead screw 3042, and a nut 3043, and the first setting mechanism 301 includes a rubber barrel 3011; among them, the input end of the planetary reducer 3041 is connected to the output shaft of the motor 306, and the output end of the planetary reducer 3041 is connected to the lead screw 3042; the lead screw 3042 is threadedly connected to the nut 3043, and the nut 3043 is fixedly connected to the rubber barrel 3011; when the output shaft of the motor 306 rotates, it drives the planetary reducer 3041 to drive the lead screw 3042 to rotate relative to the nut 3043, so that the nut 3043 drives the rubber barrel 3011 to move axially along the lead screw 3042.

[0082] Among them, the planetary reducer 3041 is a speed reduction device connecting the output shaft of the motor 306 and the lead screw 3042. Its specific structure is not limited and can be reasonably selected according to actual application requirements. For example, the planetary reducer 3041 includes a planetary gear set, an internal gear ring, a sun gear, etc. The sun gear serves as the input shaft, the internal gear ring serves as the output shaft, and the planetary gear set plays the role of speed reduction and torque transmission. Due to the different numbers and distribution patterns of the planetary gears, the planetary gear set can achieve different reduction ratios to meet different transmission requirements. The planetary reducer 3041 is used to realize the transmission of the high-speed rotation of the motor 306 to the low speed of the lead screw 3042. The lead screw 3042 and the nut 3043 convert the rotational motion of the planetary reducer 3041 into the linear motion of the nut 3043 and transfer the torque of the planetary reducer 3041 to the nut 3043 to achieve mechanical transmission. The rubber barrel 3011 is a sealing structure driven by the nut 3043 to move axially along the lead screw 3042, and the axial movement along the lead screw 3042 realizes the operations of sealing off and unsealing. For example, when the nut 3043 moves upward to squeeze the rubber barrel 3011 to expand it, the first electric control packer 300 is sealed off; when the nut 3043 moves downward, the rubber barrel 3011 automatically resets by relying on its elasticity, and the first electric control packer 300 is unsealed. By using the planetary reducer 3041, the lead screw 3042 and the nut 3043, the transmission mechanism 304 has the advantages of a compact structure, a large transmitted torque, a high transmission accuracy, a stable reduction ratio, good stability, and a high transmission efficiency, and can smoothly and efficiently perform the transmission of motion.

[0083] Further, an internal flow passage 308 communicating with the inside of the tubing 100 is provided in the first electric control packer 300. Among them, the ratio of the maximum equivalent flow diameter to the minimum equivalent flow diameter of the flow passage 308 is greater than or equal to 1.2 and less than or equal to 1.5.

[0084] Specifically, as Figure 4 shown, see in detail Figure 4 (a)— Figure 4(e), where (a), (b), (c), and (d) are the equivalent over-current diameters of A-A, B-B, C-C, and D-D in (a) respectively; the over-current channel 308 is a channel that communicates the interior of the first electrically controlled packer 300 with the interior of the tubing 100, enabling the liquid in the tubing 100 to flow through the first electrically controlled packer 300. The ratio of the maximum equivalent over-current diameter Dmax to the minimum equivalent over-current diameter Dmin of the over-current channel 308 is the contraction ratio of the over-current channel 308. The magnitude of the contraction ratio affects properties such as the flow velocity, flow rate, and pressure of the liquid in the over-current channel 308, and has an important impact on the hydrodynamic characteristics of the liquid and the equipment performance of the over-current channel 308. The larger the contraction ratio, the faster the flow velocity and the larger the flow rate, but the corresponding pressure loss is also larger; if the contraction ratio is smaller, the flow velocity is slower, the flow rate is smaller, but the pressure loss is smaller. When designing the over-current channel 308, it is necessary to comprehensively consider the needs of liquid flow and the performance requirements of the over-current channel 308 equipment, select an appropriate contraction ratio to ensure that the liquid can pass smoothly and steadily. The ratio of the maximum equivalent over-current diameter to the minimum equivalent over-current diameter of the over-current channel 308 is greater than or equal to 1.2 and less than or equal to 1.5, that is

[0085] Furthermore, the first electrically controlled packer 300 further includes a housing 307, and the transmission mechanism 304, the battery pack 305, and the motor 306 are arranged inside the housing 307. The over-current channel 308 is symmetrically arranged along the center line of the housing 307.

[0086] Among them, the housing 307 is a housing that accommodates the transmission mechanism 304, the battery pack 305, and the motor 306. The over-current channel 308 is symmetrically arranged along the center line of the housing 307, ensuring that the liquid flow states on both sides of the over-current channel 308 are basically the same, and avoiding problems such as unstable liquid flow and pressure fluctuations caused by the asymmetry of the over-current channel 308. In addition, the symmetrical arrangement of the over-current channel 308 along the center line of the housing 307 can also make the shape of the first electrically controlled packer 300 more compact and symmetrically beautiful, facilitating installation and maintenance, and the overall structural strength is relatively balanced.

[0087] This embodiment also provides a working method for an electrically controlled packer drag water-finding string in a horizontal well, and the specific steps are as follows:

[0088] S101. Lower the string body of the horizontal well drag string into the horizontal section of the target horizontal well.

[0089] S102. When the string body reaches the first preset position, the controller respectively sends a first control signal and a second control signal to the first electric control mechanism 303 and the second electric control mechanism.

[0090] S103. Cause the first electric control mechanism 303 to instruct the first driving mechanism 302 to drive the first setting mechanism 301 to set or release the packer, and cause the second electric control mechanism to instruct the second driving mechanism to drive the second setting mechanism to set or release the packer according to the second control signal.

[0091] Among them, first lower the pipe string body of the horizontal well dragging pipe string to a specified position in the horizontal section of the target horizontal well. Secondly, when the pipe string body reaches the preset position, the controller on the ground sends a first control signal to the first electric control mechanism 303; sends a second control signal to the second electric control mechanism, and the controller sends corresponding instructions respectively. Finally, the first electric control mechanism 303 in the first electric control packer 300 in the pipe string body instructs the first driving mechanism 302 to drive the first setting mechanism 301 to set or release the packer, and the second electric control mechanism of the second electric control separator 400 of the pipe string body instructs the second driving mechanism to drive the second setting mechanism to set or release the packer according to the second control signal. Through the wireless communication between the pipe string body and the controller, the operator can control the controller on the ground to send instructions to the pipe string body under the horizontal well, which can better control the water finding process, has the advantages of simple operation and high water finding efficiency, and can improve the operation efficiency and safety of the horizontal well.

[0092] In summary, the present invention provides a horizontal well electric control packer dragging water finding pipe string and method, which has the following advantages compared with the existing packing measures:

[0093] First, this horizontal well drag string includes a separately arranged string body and a controller; among them, the string body includes a tubing string, as well as a well testing rubber barrel, a first electric control packer, a second electric control separator, and a plug arranged in sequence along the axial direction of the tubing string. By separating the string body and the controller, the string body is separated from the controller that controls the string. The string body is in the horizontal wellbore. Due to the effects of underground depth, groundwater pressure, and oil and gas pressure in the horizontal wellbore environment, the downhole environment is often in a high-temperature, high-pressure, and high-humidity state. The controller is a precision electronic device and is easily damaged in the horizontal wellbore environment. At the same time, separating the string body from the controller that controls the string can make the string body and the controller independent of each other, making the control system more flexible and easier to maintain. If the string body or the controller fails, they can be repaired and replaced separately, reducing the maintenance cost. In addition, when it is necessary to change the operation process of the horizontal well drag string, only the controller needs to be modified, and it can be adjusted in a timely and rapid manner, which can better control the water-finding process and improve the water-finding effect. The string body includes a tubing string, as well as a well testing rubber barrel, a first electric control packer, a second electric control separator, and a plug arranged in sequence along the axial direction of the tubing string. The string body realizes automatic isolation and drag water-finding at any position in the horizontal well through the well testing rubber barrel, the first electric control packer, and the second electric control separator arranged in sequence along the axial direction of the tubing string.

[0094] Second, for the coiled tubing in this horizontal well, the first electric control packer includes a first setting mechanism, a first driving mechanism, and a first electric control mechanism. The first driving mechanism is electrically connected to the first electric control mechanism, the first setting mechanism is mechanically connected to the first driving mechanism, and the first electric control mechanism is wirelessly communicatively connected to the controller. The second electric control separator includes a second setting mechanism, a second driving mechanism, and a second electric control mechanism. The second driving mechanism is electrically connected to the second electric control mechanism, the second setting mechanism is mechanically connected to the second driving mechanism, and the second electric control mechanism is wirelessly communicatively connected to the controller. Through the first electric control packer and the second electric control separator, the function of finding water by dragging the coiled tubing in the horizontal well is realized, and any well section in the horizontal well can be isolated for water finding. The operation is convenient, the cost is low, it can be reused, the water finding efficiency can be improved, and the isolation effect of the electric packer is good, the control pressure is more accurate. When installing, the staff does not need to spend much effort, and the packer can be set and released directly by pressing the switch, saving labor and time costs. The first electric control packer includes a first setting mechanism, a first driving mechanism, and a first electric control mechanism. The first driving mechanism is electrically connected to the first electric control mechanism, the first setting mechanism is mechanically connected to the first driving mechanism, and the first electric control mechanism is wirelessly communicatively connected to the controller. The structure of the first electric control packer is simple. The controller can communicate with the first electric control mechanism through wireless communication. The first electric control mechanism can control the movement of the first driving mechanism by electric control. The first driving mechanism can control the movement of the first setting mechanism by mechanical means. Finally, through the movement of the first setting mechanism, the setting and releasing of the first electric control packer are realized. The operation time of the setting and releasing actions is short, the isolation effect is good, the operation reliability is high, and the operation is convenient.

[0095] The above embodiments are only one of the implementation manners that can realize the technical solution of the present invention. The scope of protection required by the present invention is not limited only by this embodiment, but also includes any changes, substitutions, and other implementation manners that are easily conceivable by those skilled in the art within the technical scope disclosed by the present invention.

Claims

1. A horizontal well electric control packer drag water-finding pipe string, characterized in that It includes a string body and a controller that are separately arranged; The string body includes a tubing string (100), a well testing rubber cylinder (200), a first electric packer (300), and a second electric separator (400) that are successively connected to the tubing string (100); The first electric packer (300) includes a first setting mechanism (301), a first driving mechanism (302), and a first electric control mechanism (303) that are successively connected; The second electric separator (400) includes a second setting mechanism, a second driving mechanism, and a second electric control mechanism that are successively connected; The controller is electrically connected to the first electric control mechanism (303) and the second electric control mechanism at the same time.

2. The electric control packer drag water-finding pipe string for horizontal well according to claim 1, characterized in that, The string body further includes a plug (500) connected to the end of the tubing string (100).

3. A horizontal well electric control packer drag water-finding string according to claim 1, characterized in that, The first driving mechanism (302) includes a transmission mechanism (304), a motor (306), and a battery pack (305) that are successively connected; The transmission mechanism (304) is connected to the first setting mechanism (301); The motor (306) and the battery pack (305) are respectively connected to the first electric control mechanism (303).

4. A horizontal well electric control packer drag water-finding pipe string according to claim 3, characterized in that, The transmission mechanism (304) includes a lead screw (3042) and a planetary reducer (3041) that are successively connected; the planetary reducer (3041) is connected to the output shaft of the motor (306); a nut (3043) is sleeved on the lead screw (3042); the nut (3043) is fixedly connected to the rubber cylinder (3011) of the first setting mechanism (301).

5. A horizontal well electric control packer drag water-finding string according to claim 1, wherein, An overcurrent channel (308) communicating with the tubing string (100) is provided inside the first electric packer (300), and the ratio of the maximum equivalent overcurrent diameter to the minimum equivalent overcurrent diameter of the overcurrent channel (308) is between 1.2 and 1.

5.

6. A horizontal well electric control packer drag water-finding string according to claim 5, characterized in that, The first electric packer (300) includes a housing (307), and the first setting mechanism (301), the first driving mechanism (302), and the first electric control mechanism (303) are all arranged inside the housing (307); The overcurrent channel (308) is symmetrically arranged along the center line of the housing (307).

7. A horizontal well electric control packer dragging water-finding string according to claim 1, characterized in that, A testing device (600) is arranged between the first electric packer (300) and the second electric separator (400) for measuring the water cut, flow rate, and temperature parameters of the horizontal well section.

8. The electric control packer dragging water finding pipe string for horizontal well according to claim 7, characterized in that, The testing device (600) includes a testing mechanism and a third electric control mechanism that are electrically connected, and the third electric control mechanism is wirelessly communicatively connected to the controller.

9. The electric control packer drag water-finding string for horizontal wells according to claim 1, wherein, The structures and dimensions of the first electric packer (300) and the second electric separator (400) are the same.

10. A working method of an electric control packer dragging water-finding string for horizontal wells, based on the electric control packer dragging water-finding string for horizontal wells according to any one of claims 1-9, characterized in that, It includes: Lower the string body to a specified position in the horizontal section of the target horizontal well; when the string body reaches the preset position, the controller on the ground sends instructions to the first electric control mechanism (303) and the second electric control mechanism respectively, so that the first electric control mechanism (303) controls the first driving mechanism (302) to drive the first setting mechanism (301) to set or release the seal, and the second electric control mechanism controls the second driving mechanism to drive the second setting mechanism to set or release the seal.

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