A steam chamber over-coverage range monitoring device based on heavy oil thermal recovery

Abstract

The invention discloses a steam chamber overburden range monitoring device based on heavy oil thermal recovery, which belongs to the field of oil and gas field exploitation. The device comprises a monitoring pipe, a positioning frame located at one end of the monitoring pipe in the axial direction and coaxially connected to the monitoring pipe, a drill bit located at the other end of the monitoring pipe in the axial direction and coaxially connected to the monitoring pipe, a lifting mechanism is coaxially arranged inside the monitoring pipe, an equipment platform movable along the axial direction of the monitoring pipe is arranged on the lifting mechanism, a plurality of hydrophones, high-temperature sensors and a controller are arranged on the equipment platform, a sound-transmitting groove is arranged on the side wall of the monitoring pipe, the controller is connected with the hydrophone, the high-temperature sensor, the lifting mechanism, the positioning frame and the drill bit, and the lifting mechanism drives the equipment platform to lift and lower, so as to complete the continuous tracking process of the steam chamber overburden diffusion upwards. The controller can realize the real-time monitoring and precise control of the steam chamber overburden process by the cooperation of the downhole monitoring unit through the precise control of the lifting mechanism, the hydrophone and the high-temperature sensor.

Description

Technical Field

[0001] The invention relates to the field of oil and gas field exploitation, and in particular to a steam chamber over-coverage range monitoring device based on heavy oil thermal recovery. Background Art

[0002] The viscosity of crude oil in heavy oil reservoirs is high, and it is difficult to flow in the oil layer, making it very difficult to exploit. Since the viscosity of crude oil will decrease rapidly with the increase of temperature, thermal recovery is generally used for exploitation. At present, the commonly used thermal recovery methods mainly include steam stimulation, steam drive and steam-assisted gravity drainage. Steam stimulation is to inject a certain amount of hot steam with dryness into the heavy oil layer, then shut down and seal the well, let the injected hot steam heat the heavy oil layer, reopen the well after a certain heating time, and exploit the heated underground crude oil. This method has low mining difficulty and is economical, so it is widely used, but this method has a relatively low recovery rate. In order to improve the recovery rate, steam drive and SAGD are generally used on the basis of steam stimulation to continue exploitation. SAGD technology is a development method that uses gravity to develop heated crude oil by arranging horizontal wells at the bottom of vertical wells or horizontal wells, which can obtain a recovery rate of more than 70%.

[0003] The basis for the successful development of this SAGD technology is the understanding of the development laws of steam chambers and the mastery of the front distribution form and speed. At present, four-dimensional seismic, inclinometer or potential method and numerical simulation are generally used to understand the development laws of steam chambers. However, these methods cannot be applied to the monitoring of steam chambers beyond the coverage range of steam injection dryness in horizontal wells. The steam chamber is diffusive with steam injection and time. At the same time, the density of the diffused heavy oil sand layer is uneven, resulting in uneven diffusion laws, and there is also variability with changes in well pressure. Traditional instruments have problems such as poor continuity and fixed position when used for steam chamber monitoring. In the process of responding to steam chamber changes, it is impossible to accurately conduct real-time survey of steam chamber diffusion data, affecting the accuracy of feedback data. Summary of the invention

[0004] In view of the above problems, the present invention provides a steam chamber overburden range monitoring device based on heavy oil thermal recovery, which has the advantage of being able to explore steam chamber diffusion data in real time.

[0005] The technical solution of the present invention is:

[0006] A steam chamber over-coverage range monitoring device based on heavy oil thermal recovery comprises a monitoring tube, a positioning frame located at one end of the monitoring tube in the axial direction and coaxially connected to the monitoring tube, and a drill bit located at the other end of the monitoring tube in the axial direction and coaxially connected to the monitoring tube. A lifting mechanism is coaxially arranged inside the monitoring tube, an equipment platform movable along the axial direction of the monitoring tube is arranged on the lifting mechanism, a plurality of hydrophones, high-temperature sensors and a controller are arranged on the equipment platform, a sound-transmitting groove is arranged on a side wall of the monitoring tube, and the controller is connected to the hydrophone, the high-temperature sensor, the lifting mechanism, the positioning frame and the drill bit.

[0007] The lifting mechanism is a screw nut lifting mechanism.

[0008] The lifting mechanism includes an upper fixed plate located inside the monitoring tube, coaxial with the monitoring tube and close to the positioning frame, and a lower fixed plate located inside the monitoring tube, coaxial with the monitoring tube and close to the drill bit. A threaded rod is coaxially connected between the upper and lower fixed plates. One end of the threaded rod close to the upper fixed plate passes through the upper fixed plate and is connected to the regulating motor. An equipment platform is sleeved on the threaded rod. The equipment platform and the threaded rod form a screw-nut transmission pair. The signal input end of the regulating motor is connected to the controller.

[0009] A guide rod is arranged in a ring between the upper fixing plate and the lower fixing plate with the threaded rod as the rotation center. One end of the guide rod is connected to the upper fixing plate, and the other end is connected to the lower fixing plate. The guide rod passes through the equipment table.

[0010] The plurality of high-temperature sensors and hydrophones are evenly distributed on the equipment platform with the monitoring pipe axis as the center of rotation, and the plurality of high-temperature sensors and hydrophones are arranged at intervals.

[0011] The end of the drill bit is connected to a screw-in motor, and the screw-in motor is fixed inside the monitoring tube.

[0012] The positioning frame includes a ring platform that is coaxial with the monitoring tube, sleeved on the outside of the monitoring tube and can slide along the monitoring tube, and a plurality of pile nails that are evenly distributed with the axis of the ring platform as the rotation center. The pile nails are fixedly connected to the ring platform, and the rotation axis of the pile nails is parallel to the rotation axis of the monitoring tube.

[0013] The outer surface of the ring platform is a truncated cone, the outer diameter of the end of the ring platform away from the drill bit is smaller than the outer diameter of the end of the ring platform close to the drill bit, and the pile nail is arranged at the end of the ring platform close to the drill bit.

[0014] The outer wall of the monitoring tube is provided with an inner tooth groove along its axial direction, the inner wall of the ring table is provided with a gear meshing with the inner tooth groove, one side of the gear meshes with a servo motor, and the signal input end of the servo motor is connected to a controller.

[0015] The device also includes a wireless transmitter and a wireless receiving terminal. The wireless transmitter is used to upload the data monitored by the high temperature sensor and the hydrophone, and the wireless receiving terminal is used to receive the uploaded data and perform data processing.

[0016] The beneficial effects of the present invention are:

[0017] A positioning frame is set on the upper part of the monitoring pipe, and a drill bit is set on the lower part. The cooperation between them can assist the monitoring pipe to be placed in the reservoir position accurately and stably. A sound-transmitting groove is set on the side wall of the monitoring pipe, which can cooperate with the internal hydrophone and high-temperature sensor to monitor the overlap range of the steam chamber. The high-temperature sensor can also track the range of the steam chamber in combination with temperature changes. The lifting mechanism drives the equipment platform to rise and fall, which can complete the tracking process of the upward overlap diffusion of the steam chamber, forming a highly continuous detection process, controlling the data of the change law of the overlap range, and maintaining the continuity of monitoring. The controller can realize the real-time monitoring and precise control of the steam chamber overlap process by cooperating with the downhole monitoring unit through precise control of the lifting mechanism, the hydrophone and the high-temperature sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of a steam chamber over-coverage range monitoring device based on heavy oil thermal recovery according to an embodiment of the present invention;

[0019] Figure 2 It is a structural schematic diagram of a monitoring tube of a steam chamber over-coverage range monitoring device based on heavy oil thermal recovery according to an embodiment of the present invention;

[0020] Figure 3 It is a structural schematic diagram of an equipment platform of a steam chamber over-coverage range monitoring device based on heavy oil thermal recovery according to an embodiment of the present invention;

[0021] Figure 4 It is a top view of an equipment platform of a steam chamber over-coverage range monitoring device based on heavy oil thermal recovery according to an embodiment of the present invention;

[0022] Figure 5 It is a structural schematic diagram of a positioning frame of a steam chamber over-coverage range monitoring device based on heavy oil thermal recovery according to an embodiment of the present invention;

[0023] Figure 6 It is a top view of a positioning frame of a steam chamber over-coverage range monitoring device based on heavy oil thermal recovery according to an embodiment of the present invention;

[0024] Figure 7 It is a structural schematic diagram of a drill bit of a steam chamber over-coverage range monitoring device based on heavy oil thermal recovery according to an embodiment of the present invention.

[0025] Description of reference numerals:

[0026] 1 is a monitoring tube, 2 is a positioning frame, 3 is a drill bit, 4 is a lifting mechanism, 5 is an equipment table, 11 is a sound-transmitting groove, 12 is an inner tooth groove, 21 is a ring table, 22 is a pile nail, 211 is a gear, 31 is a screw-in motor, 41 is an upper positioning plate, 42 is a lower positioning plate, 43 is a threaded rod, 44 is a regulating motor, 45 is a guide rod, 51 is a hydrophone, 52 is a high-temperature sensor, 53 is a controller, and 212 is a servo motor. DETAILED DESCRIPTION

[0027] The embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0028] Example

[0029] like Figure 1-Figure 7 As shown, a steam chamber overlay range monitoring device based on heavy oil thermal recovery includes a monitoring tube 1, a positioning frame 2 located at one end of the monitoring tube 1 in the axial direction and coaxially connected to the monitoring tube 1, a drill bit 3 located at the other end of the monitoring tube 1 in the axial direction and coaxially connected to the monitoring tube 1, a lifting mechanism 4 is coaxially arranged inside the monitoring tube 1, an equipment platform 5 movable along the axial direction of the monitoring tube 1 is arranged on the lifting mechanism 4, a plurality of hydrophones 51, a high temperature sensor 52 and a controller 53 are arranged on the equipment platform 5, a sound-transmitting groove 11 is provided on the side wall of the monitoring tube 1, and the controller 53 is connected to the hydrophone 51, the high temperature sensor 52, the lifting mechanism 4, the positioning frame 2 and the drill bit 3.

[0030] The working principle of the above technical solution is as follows:

[0031] A positioning frame 2 is arranged on the upper part of the monitoring tube 1, and a drill bit 3 is arranged on the lower part, which cooperate with each other to assist the monitoring tube 1 to be placed in the reservoir position accurately and stably. A sound-transmitting groove 11 is arranged on the side wall of the monitoring tube 1, which can cooperate with the internal hydrophone 51 and high-temperature sensor 52 to monitor the steam chamber overlap range, and the high-temperature sensor 52 can also track the steam chamber range in conjunction with the temperature change. The lifting mechanism 4 drives the equipment platform 5 to rise and fall, and the tracking process of the steam chamber's upward overlap diffusion can be completed. The controller 53 can realize the real-time monitoring and precise control of the steam chamber overlap process by cooperating with the downhole monitoring unit through the precise control of the lifting mechanism 4, the hydrophone 51 and the high-temperature sensor 52.

[0032] The lifting mechanism 4 is a screw-nut lifting mechanism, which includes an upper fixed plate 41 located inside the monitoring tube 1, coaxial with the monitoring tube 1 and close to the positioning frame 2, and a lower fixed plate 42 located inside the monitoring tube 1, coaxial with the monitoring tube 1 and close to the drill bit 3. A threaded rod 43 is coaxially connected between the upper fixed plate 41 and the lower fixed plate 42. One end of the threaded rod 43 close to the upper fixed plate 41 passes through the upper fixed plate 41 and is connected to the regulating motor 44. The equipment platform 5 is sleeved on the threaded rod 43, and the equipment platform 5 and the threaded rod 43 form a screw-nut transmission pair. The signal input end of the regulating motor 44 is connected to the controller 53, and the regulating motor 44 is controlled by the controller 53 to work, thereby controlling the equipment platform 5 to move up and down along the threaded rod 43. The upper fixed plate 41 and the lower fixed plate 42 play a limiting role, which can ensure the safety of the lifting mechanism 4.

[0033] A guide rod 45 is arranged in a ring between the upper fixed plate 41 and the lower fixed plate 42 with the threaded rod 43 as the rotation center. One end of the guide rod 45 is connected to the upper fixed plate 41, and the other end is connected to the lower fixed plate 42. The guide rod 45 runs through the equipment platform 5. The setting of the guide rod 45 can ensure the stability of the movement of the equipment platform 5.

[0034] A plurality of high temperature sensors 52 and hydrophones 51 are evenly distributed on the equipment platform 5 with the axis of the monitoring pipe 1 as the center of rotation. The plurality of high temperature sensors 52 and hydrophones 51 are arranged at intervals to ensure the reliability and accuracy of the monitoring data.

[0035] The end of the drill bit 3 is connected to a screw-in motor 31 , which is fixed inside the monitoring tube 1 . The screw-in motor 31 is controlled by a controller to drive the drill bit 3 to drill into the reservoir, thereby ensuring the accuracy of the monitoring tube 1 in the reservoir.

[0036] The positioning frame 2 includes a ring platform 21 which is coaxial with the monitoring tube 1 and sleeved on the outside of the monitoring tube 1 and can slide along the monitoring tube 1, and a plurality of piles 22 are evenly distributed with the axis of the ring platform 21 as the rotation center. The piles 22 are fixedly connected to the ring platform 21, and the rotation axis of the piles 22 is parallel to the rotation axis of the monitoring tube 1. The outer surface of the ring platform 21 is a truncated cone, and the outer diameter of the end of the ring platform 21 away from the drill bit 3 is smaller than the outer diameter of the end of the ring platform 21 close to the drill bit 3. The piles 22 are arranged at the end of the ring platform 21 close to the drill bit 3, and the outer wall of the monitoring tube 1 is arranged along the axis direction thereof. An inner tooth groove 12 is disposed, and a gear 211 meshing with the inner tooth groove 12 is disposed on the inner wall of the ring platform 21. A servo motor 212 meshes with one side of the gear 211. The signal input end of the servo motor 212 is connected to the controller 53. The ring platform 21 cooperates with the pile nail 22 to ensure stable support for the monitoring pipe 1. During operation, the servo motor 212 drives the ring platform 21 to slide along the monitoring pipe 1 to form an auxiliary force in the process of drilling into and pulling out of the reservoir. Since a truncated cone structure is used, the wear on the outer wall of the monitoring pipe 1 can be reduced.

[0037] The device also includes a wireless transmitter and a wireless receiving terminal. The wireless transmitter is used to upload the data monitored by the high temperature sensor 52 and the hydrophone 51. The wireless receiving terminal is used to receive the uploaded data and process the data. The data is transmitted to the terminal for analysis through wireless transmission, so that the steam chamber range can be accurately monitored.

[0038] The specific monitoring methods are as follows:

[0039] S1. Reservoir drilling: First, the heavy oil reservoir part of the crude oil exploration area is drilled, and two horizontal wells are formed by drilling. The two groups of horizontal wells are parallel to each other and the distance between them is about four to six meters;

[0040] S2. Monitoring point arrangement: multiple groups of downhole monitoring units are arranged and placed along the upper well horizontal line of the horizontal well. The number of downhole monitoring units can be changed according to the parallel length of the well opening and the predetermined monitoring range. The drill bit connected by the screw-in motor is driven to drill in a screw-in manner until the monitoring pipe rack is within the range of the heavy oil reservoir;

[0041] S3, steam injection: after the downhole monitoring unit is placed, steam is injected through the surface wellhead position at the top of the upper well in the two groups of horizontal wells. After the steam enters the horizontal well cavity position at the bottom of the wellhead along the upper wellhead, the surrounding heavy oil reservoir is heated by steam to reduce its viscosity. At the same time, the steam overlaps upward in the reservoir to form a steam cavity, making the heavy oil more mobile. Then the heavy oil flows into the lower well, and the mobile heavy oil in the lower well is collected by a pump;

[0042] S4. Position monitoring: During the steam overburden process, since the monitoring tube is within the reservoir range, the overburden information of the steam chamber can be monitored through the high-temperature sensor and hydrophone carried by the equipment platform in the monitoring tube. At the same time, the equipment platform can move with the diffusion of the steam chamber, and the up and down position movement tracking can be achieved through the threaded rod transmission lifting and lowering, so as to maintain real-time control of the upward overburden range of the steam chamber within the range;

[0043] S5. Information transmission: The breath in the process of injecting steam beyond the coverage range is transmitted to the information receiving terminal in real time in coordination with the wireless controller and the wireless receiving terminal, and then the information is processed and counted through the indoor monitoring part.

[0044] The above-mentioned embodiments only express the specific implementation of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A steam chamber over-coverage range monitoring device based on heavy oil thermal recovery, characterized in that: It comprises a monitoring tube, a positioning frame located at one end of the monitoring tube in the axial direction and coaxially connected to the monitoring tube, and a drill bit located at the other end of the monitoring tube in the axial direction and coaxially connected to the monitoring tube, a lifting mechanism is coaxially arranged inside the monitoring tube, an equipment platform that can move along the axial direction of the monitoring tube is arranged on the lifting mechanism, a plurality of hydrophones, high temperature sensors and controllers are arranged on the equipment platform, a sound-permeable groove is arranged on the side wall of the monitoring tube, and the controller is connected to the hydrophone, high temperature sensor, lifting mechanism, positioning frame and drill bit; The lifting mechanism is a screw nut lifting mechanism; The lifting mechanism comprises an upper fixing plate located inside the monitoring tube, coaxial with the monitoring tube and close to the positioning frame, and a lower fixing plate located inside the monitoring tube, coaxial with the monitoring tube and close to the drill bit, a threaded rod is coaxially connected between the upper fixing plate and the lower fixing plate, one end of the threaded rod close to the upper fixing plate passes through the upper fixing plate and is connected to the regulating motor, an equipment platform is sleeved on the threaded rod, the equipment platform and the threaded rod form a screw nut transmission pair, and the signal input end of the regulating motor is connected to the controller; A guide rod is arranged in a ring between the upper fixing plate and the lower fixing plate with the threaded rod as the rotation center, one end of the guide rod is connected to the upper fixing plate, and the other end is connected to the lower fixing plate, and the guide rod passes through the equipment table; The positioning frame includes a ring platform coaxial with the monitoring tube and sleeved on the outside of the monitoring tube and slidable along the monitoring tube, and a plurality of pile nails evenly distributed with the axis of the ring platform as the rotation center, the pile nails are fixedly connected to the ring platform, and the rotation axis of the pile nails is parallel to the rotation axis of the monitoring tube; The outer surface of the ring is a truncated cone, the outer diameter of the end of the ring away from the drill bit is smaller than the outer diameter of the end of the ring close to the drill bit, and the pegs are arranged at the end of the ring close to the drill bit; The outer wall of the monitoring tube is provided with an inner tooth groove along its axial direction, the inner wall of the ring table is provided with a gear meshing with the inner tooth groove, one side of the gear meshes with a servo motor, and the signal input end of the servo motor is connected to a controller.

2. The steam chamber over-coverage range monitoring device based on heavy oil thermal recovery according to claim 1 is characterized in that: The plurality of high-temperature sensors and hydrophones are evenly distributed on the equipment platform with the monitoring pipe axis as the center of rotation, and the plurality of high-temperature sensors and hydrophones are arranged at intervals.

3. The steam chamber over-coverage range monitoring device based on heavy oil thermal recovery according to claim 1 is characterized in that: The end of the drill bit is connected to a screw-in motor, and the screw-in motor is fixed inside the monitoring tube.

4. The steam chamber over-coverage range monitoring device based on heavy oil thermal recovery according to claim 1 is characterized in that: The device also includes a wireless transmitter and a wireless receiving terminal. The wireless transmitter is used to upload the data monitored by the high temperature sensor and the hydrophone, and the wireless receiving terminal is used to receive the uploaded data and perform data processing.

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