CN116733454B - Intelligent water finding method for horizontal well - Google Patents

Abstract

The invention discloses an intelligent water-finding method for a horizontal well, which comprises the steps of lowering a water-finding pipe string carrying a water-finding instrument to a horizontal section; providing buoyancy for the water-finding pipe string, so that the water-finding pipe string is suspended in the well fluid in the horizontal section; the water-finding pipe string floats and moves in the horizontal section, and water is found by the water-finding instrument in the moving process; and recovering the water searching pipe string. The invention provides an intelligent water finding method for a horizontal well, which aims to solve the problems of serious friction, complicated operation process, easy resistance and the like of the traditional water finding method, and realize the purposes of reducing tool friction, enabling tools to pass through horizontal sections easily and the like.

Description

An intelligent method for finding water in horizontal wells

Technical field

The invention relates to the field of oil and gas development, and in particular to an intelligent water-finding method for horizontal wells.

Background technique

In oil and gas engineering, horizontal wells are a common development method for low-permeability oil and gas reservoirs. Water production and water content of horizontal wells continue to rise after they are put into production, which can easily lead to problems such as water breakthrough and water flooding, which will have a great impact on the productivity of oil and gas wells. It is one of the important technical means to ensure productivity in the development process of horizontal wells to grasp the water output situation of horizontal wells in a timely manner and quickly find the water outlet point or water interval, and use this as a basis to effectively block the water outlet point.

Traditional water finding technologies such as horizontal well liquid production profile testing, distributed fiber optic liquid production profile testing, dynamic monitoring water finding, segmented production water finding testing, etc. have the problems of low water finding accuracy, long downhole operation cycle, low efficiency, and difficulty in setting up and running pipes. The column process is complicated and other defects; Chinese patent application CN 116291399 A discloses "a non-self-injection horizontal well gas lift liquid drainage test water finding operation system and method", which requires a gas source from the ground for gas lift and relies on continuous Oil pipeline operations can only work, but there are still problems such as complicated operation processes and low efficiency in finding water.

In addition, in the existing technology, there is also an operation method of using an underground crawler to carry a water-finding instrument into the well, and slowly crawling in the horizontal section to find water. However, (1) the friction during the crawling process is large and requires a large power output. In order to meet the crawling requirements, the structure of the well entering pipe string is complex and bloated; (2) the crawling process is easy to encounter obstacles, and the success rate of the operation is low; (3) it is easy to cause irreversible damage to the pipe wall; (4) the endurance is insufficient, and the single well entry The water-finding well section is limited.

In summary, there is considerable room for improvement in the existing methods of finding water in horizontal wells.

Contents of the invention

The present invention provides an intelligent water-finding method for horizontal wells to solve the problems of existing water-finding methods such as serious friction, complicated operation processes, and easy encountering obstacles, and to achieve the purpose of reducing tool friction and making it easier for tools to pass through horizontal sections.

The present invention is realized through the following technical solutions:

An intelligent water-finding method for horizontal wells, including:

Lower the water-finding pipe string carrying the water-finding instrument to the horizontal section;

Provide buoyancy for the water-finding pipe string so that the water-finding pipe string is suspended in the well fluid in the horizontal section;

The water-finding pipe string is made to snorkel and travel in the horizontal section, and the water-finding instrument is used to find water during the traveling process;

Recover the water pipe string mentioned above.

In view of the fact that the horizontal well water search operation in the prior art requires complex and cumbersome underground operations, or requires the use of an underground crawler to drag the instrument, which leads to serious friction and easy obstruction, etc., this application proposes an intelligent horizontal well search method. For the water method, this application carries a water-finding instrument into the well through a string of water-finding pipes. The water-finding instrument is an existing instrument in the field and is not limited here. This application provides sufficient buoyancy for the water-finding pipe string after lowering it to the horizontal section, so that the water-finding pipe string can be suspended in the well fluid in the horizontal section, and then keeps the water-finding pipe string in a suspended state and snorkels in the horizontal section. During the movement, the water-finding instrument can be started to perform the required water-finding operation in the horizontal section; after the water-finding operation is completed, the water-finding pipe string can be recycled to the wellhead.

In this application, the snorkeling movement of the water pipes strung in the horizontal section can be realized by using any existing snorkeling equipment movement method, such as using underwater movement methods such as submarines, underwater robots or torpedoes, as long as the ability to It can work under high temperature, high pressure and two-phase or three-phase mixed flow conditions in the well.

This application adopts a completely different technical route from the existing technology, abandoning the traditional operation method of relying on underground crawler towing, avoiding direct contact and friction between the water pipe string and the well wall, and does not need to be equipped with large power equipment. Significantly reducing the structural complexity of the water-finding pipe string is conducive to the miniaturization of water-finding tools; and because the pipe string is not in direct contact with the well wall, collision damage to the pipes in the well can be significantly reduced; in addition, since this application is based on floating It travels in a submersible manner, so it can easily pass through the obstruction points of traditional operations, such as the coupling position of the horizontal casing/screen tube or the deformed section of the casing/screen tube, which greatly reduces the encounter points of the water-finding instrument. It reduces risks and significantly improves the success rate of operations and underground safety.

Furthermore, during the process of lowering the water-finding pipe string to the horizontal section, the buoyancy force on the water-finding pipe string is less than the gravity of the water-finding pipe string, so as to ensure that the water-finding pipe string can be lowered to the horizontal section by gravity.

Further, methods for lowering the water pipe string to the horizontal section include:

At the wellhead, connect the anchor nipple to the top of the water pipe string;

Connect the cable to the anchoring sub;

Release the cable and lower the water pipe string to the predetermined well depth;

Anchor the anchor sub at the current position;

Disengage the water pipe string from the anchor nipple.

This solution is connected between the water-finding pipe string and the cable through anchoring nipples, making it easier to lower the water-finding pipe string into the well using cable operation. During the well entry process, the anchoring sub-joint and the water-finding pipe string remain connected. After the tool reaches the horizontal section, the anchoring sub-joint is driven to start, anchoring itself at the current position in the well, and then the water-finding pipe string is separated from the anchoring sub-joint. , the water-finding pipe string can be driven to snorkel in the horizontal section, while the anchoring sub-joint always remains at the current position. After the water-finding operation is completed, the water-finding pipe string is reconnected to the anchoring docking, and the cable is recovered from the wellhead to complete Retrieval of water pipe strings.

Among them, the connection method between the anchoring sub-joint and the water-finding pipe string is not limited here, and all existing detachable connection methods in the field that can realize underground docking and separation can be applied. In addition, the specific anchoring method of the anchor sub-joint is not limited here. All temporary anchoring structures in the well commonly used in this field, such as anchors, anchors and packers, can be applied.

Further, the water-finding pipe string carries a battery and a wireless charging receiving module electrically connected to the battery; the anchoring nipple carries a wireless charging transmitting module that matches the wireless charging receiving module;

When the anchoring nipple is connected to the water pipe string, the wireless charging transmitting module and the wireless charging receiving module are electrically connected.

The battery can be used to power various electrical equipment inside the water pipe string. This solution uses the cooperation of the wireless charging transmitting module and the wireless charging receiving module to charge the battery to overcome the shortcomings of insufficient battery life of the existing technology.

Further, during the process of releasing the cable, the battery is charged through the cable;

During the snorkeling process of the water-finding pipe string in the horizontal section, when the battery power is lower than the set threshold, the water-finding pipe string is snorkeled back to the anchoring sub-joint, reconnected to the anchoring sub-joint, and then connected to the anchoring sub-joint through the cable. The battery is charged.

That is, in the process of finding the water pipe string and entering the well in this application, since it is lowered through the cable, it can be directly powered by the cable, so that the battery can be charged during the process of entering the well, overcoming the shortcoming that the pipe string needs to be charged at the wellhead in advance before the pipe string can be lowered. , significantly saving operation time; in addition, during the process of finding water, if the battery power is insufficient, the water-finding pipe string can also be moved in reverse by snorkeling, returned to the position of the anchoring sub-joint, and reconnected with the anchoring sub-joint. Docking, and then completing the charging of the battery in the well. The charging process does not require lifting the water pipe string, so there is no need to lift and lower the pipe string during the entire water search process, which can significantly improve the efficiency of the water search operation and ensure that the water search operation can be completed in a single entry into the well. The effect of water search operations in the entire horizontal section.

Further, the method of recycling the water pipe string includes:

Snorkel the water pipe string back to the anchoring nipple and reconnect it to the anchoring nipple;

Unanchor the anchor sub at the current position;

The cable is recovered at the wellhead and the anchoring sub-joint and water pipe string are lifted simultaneously.

Further, the anchoring nipple and the water-finding pipe string are connected through a clutch mechanism, and the clutch mechanism is used to dock and disengage the anchoring nipple and the water-finding pipe string.

This solution uses a clutch mechanism to realize the detachable connection between the anchoring nipple and the water pipe string. Specifically, during the process of entering the well, the clutch mechanism makes the anchoring sub-joint and the water-seeking pipe string stably connected, so that the anchoring sub-joint and the water-seeking pipe string enter the well together; when the water-seeking pipe string reaches the horizontal section and the anchoring sub-joint completes the anchoring After anchoring, the clutch mechanism acts to separate the anchoring sub-joint and the water-finding pipe string from each other. The anchoring sub-joint remains in its original position, while the water-finding pipe string starts snorkeling for subsequent water-finding operations. After the water-finding operation is completed, the water-finding pipe string returns to a position close to the anchoring sub-joint, and the clutch mechanism is started again to reconnect the anchoring sub-joint and the water-finding pipe string.

The clutch mechanism in this solution can be implemented using any existing clutch technology. It only needs to connect the anchor sub-joint and the water-finding pipe string to each other when they need to be docked, and to separate the anchoring sub-joint and the water-finding pipe string from each other when they need to be separated. Can. Such as the clutch structure of a motor vehicle transmission, the docking and separation structure of a spacecraft, or the direct use of electromagnetic clutches, etc. In addition, the clutch mechanism can also be realized through the existing underground docking methods in this field, such as the strong magnetic docking clutch method controlled by electromagnets, the overshot fishing method or the robot grabbing method, etc.

Furthermore, the volume-adjustable bag carried in the water pipe string provides buoyancy for the water pipe string.

The water-seeking pipe string needs to rely on gravity to reach the horizontal section when working, and the fluid density in the well is different under different well conditions. Therefore, in order to ensure that the water-seeking pipe string can smoothly pass through the vertical well section and be stably suspended in the horizontal section, this solution uses bladders to It provides buoyancy for the water-seeking pipe string, and can adjust the buoyancy by adjusting the drainage volume of the bag, so as to ensure that the water-seeking pipe string can smoothly enter the well with a small buoyancy state, and after reaching the horizontal section, according to the specific vertical depth and fluid density in the well Flexibly adjust the buoyancy under other working conditions to bring it into a suspended state.

Further, the method of suspending the water-finding pipe string in the well fluid in the horizontal section includes: filling the bladder with fluid to expand the bag and increase the drainage volume until the water-finding pipe string is suspended as a whole.

Further, look for water pipe strings while snorkeling in the horizontal section:

Real-time monitoring of the longitudinal centering degree of the position where the bag is carried on the string of water-finding pipes, wherein the string of water-finding pipes carries at least two bags;

If the position of the bag is higher in the longitudinal direction, part of the fluid filled in the corresponding bag is released, so that the bag shrinks and the drainage volume decreases until the position of the bag is centered longitudinally;

If the position of the bag is low in the longitudinal direction, continue to fill the corresponding bag with fluid to expand the bag and increase the drainage volume until the position of the bag is longitudinally centered.

Compared with the prior art, the present invention has the following advantages and beneficial effects:

1. An intelligent water-finding method for horizontal wells of the present invention adopts a completely different technical route from the existing technology, abandons the traditional operation method of relying on underground crawler towing, and avoids direct contact between the pipe string and the well wall. It eliminates the need for large-scale power equipment and can significantly reduce the structural complexity of the well pipe string, which is conducive to the miniaturization of water-finding tools and can also significantly reduce collision damage to the pipes in the well.

2. The present invention is an intelligent water-finding method for horizontal wells. It travels in a horizontal section in a snorkeling manner and can easily pass through the obstruction points of traditional water-finding operations, which greatly reduces the risk of obstruction of water-finding instruments. , significantly improving the operation success rate and underground safety.

3. The present invention is an intelligent water-finding method for horizontal wells. The buoyancy is adjustable to ensure stable well entry to the horizontal section and to maintain good longitudinal centering when snorkeling in the horizontal section.

4. The present invention is an intelligent water-finding method for horizontal wells, which can realize the stable recovery of water-finding pipe strings out of the well and reduce the underground accident rate.

5. An intelligent water-finding method for horizontal wells of the present invention can realize automatic charging in the well, so that there is no need to lift and lower the pipe string to charge during the water-finding process, which can significantly improve the efficiency of water-finding operations and ensure that the entire horizontal section can be completed with a single entry into the well. Looking for water.

Description of drawings

The drawings described here are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation to the embodiments of the present invention. In the attached picture:

Figure 1 is a schematic flow chart of a specific embodiment of the present invention;

Figure 2 is a schematic structural diagram of a water pipe string in a specific embodiment of the present invention;

Figure 3 is a half-section schematic diagram of a water pipe string in a specific embodiment of the present invention;

Figure 4 is a partial enlarged view of position A in Figure 3;

Figure 5 is a half-section schematic diagram of the buoyancy adjustment assembly in a specific embodiment of the present invention;

Figure 6 is a partial structural schematic diagram of the anchoring nipple in a specific embodiment of the present invention;

Figure 7 is an internal schematic diagram of the anchoring nipple in a specific embodiment of the present invention;

Figure 8 is a schematic structural diagram of the clutch mechanism when disengaged in a specific embodiment of the present invention;

Figure 9 is a schematic structural diagram of the clutch mechanism when disengaged in a specific embodiment of the present invention;

Figure 10 is a schematic structural diagram of the clutch mechanism during docking in a specific embodiment of the present invention.

Marks and corresponding parts names in the attached drawings:

1-Hull, 101-First chamber, 102-Second chamber, 103-Opening, 104-Third chamber, 105-Through hole, 2-Buoyancy device, 3-Paddle, 4-First power Source, 5-bag, 6-cylinder, 7-piston, 8-second power source, 9-induction ring, 10-first sensor, 11-anchoring nipple, 12-third power source, 13-cable Connector, 14-battery, 15-wireless charging transmitting module, 16-wireless charging receiving module, 17-coupling, 18-oil bag seat, 19-first docking part, 20-second docking part, 21-notch , 22-positioning frame, 23-anchoring block, 24-fourth power source, 25-first mounting plate, 26-second mounting plate, 27-fifth power source, 28-first rotating shaft, 29-first Positioning wheel, 30-first fastening part, 31-first elastic part, 32-sixth power source, 33-second rotating shaft, 34-second positioning wheel, 35-second fastening part, 36-second Elastic member, 37-first fastening groove, 38-second fastening groove.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples and drawings. The schematic embodiments of the present invention and their descriptions are only used to explain the present invention and do not as a limitation of the invention. In the description of this application, it should be understood that terms such as "front", "rear", "left", "right", "upper", "lower", "vertical", "horizontal", "high" The orientations or positional relationships indicated by "low", "inside", "outer", etc. are based on the orientations or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply what is meant. The device or element must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as limiting the scope of the present application.

Example 1:

An intelligent water-finding method for horizontal wells, as shown in Figure 1, includes the following steps:

S1. Lower the water-finding pipe string carrying the water-finding instrument to the horizontal section; during the lowering process, the buoyancy force on the water-finding pipe string should be less than the gravity of the water-finding pipe string;

S2. Provide sufficient buoyancy for the water-finding pipe string so that the water-finding pipe string is suspended in the well fluid in the horizontal section;

S3. Make the water-finding pipe string snorkel and travel in the horizontal section, and use the water-finding instrument to find water during the traveling process;

S4. Recover the water pipe string.

Example 2:

An intelligent water-finding method for horizontal wells. Based on Embodiment 1, the method of lowering the water-finding pipe string to the horizontal section specifically includes:

S101. Connect the anchor nipple to the top of the water pipe string at the wellhead;

S102. Connect the cable to the anchoring nipple;

S103. Release the cable and lower the water pipe string to the predetermined well depth;

S104. Anchor the anchoring sub-section at the current position;

S105. Detach the water pipe string from the anchoring nipple.

Wherein, the water-finding pipe string carries a battery and a wireless charging receiving module electrically connected to the battery; the anchoring nipple carries a wireless charging transmitting module that matches the wireless charging receiving module; when When the anchoring nipple is connected to the water pipe string, the wireless charging transmitting module and the wireless charging receiving module are electrically connected.

Therefore, in this embodiment, during the process of releasing the cable, the battery is charged through the cable; while the water-finding pipe string is snorkeling in the horizontal section, when the battery power is lower than the set threshold, the water-finding pipe string is caused to snorkel back. The anchoring sub-section is reconnected to the anchoring sub-section, and then the battery is charged through the cable.

Preferably, after the water-finding pipe string is lowered to the horizontal section of the predetermined well depth, first determine whether the battery is full; if it is not full yet, keep the connection between the water-finding pipe string and the anchoring pup until the battery is fully charged, and then use the water-finding pipe string. The water pipe string breaks away from the anchoring nipple.

In addition, during the snorkeling process, the following method is used to determine whether the battery power is lower than the set threshold:

The water-finding pipe string records in real time the distance traveled forward after breaking away from the anchoring sub-section, and calculates the minimum power required to return to the distance after turning off the water-finding instrument;

Monitor the remaining battery power in real time and determine:

If the remaining power is less than α coefficient of 1;

After charging is completed, keep the water-finding instrument closed, allow the water-finding pipe string to snorkel again to the last return position, then turn on the water-finding instrument and continue the water-finding operation.

In a more preferred embodiment, the method for recycling the water pipe string includes:

Snorkel the water pipe string back to the anchoring nipple and reconnect it to the anchoring nipple;

Unanchor the anchor sub at the current position;

The cable is recovered at the wellhead and the anchoring sub-joint and water pipe string are lifted simultaneously.

The anchoring sub-joint and the water-finding pipe string are connected through a clutch mechanism, and the clutch mechanism is used to dock and disengage the anchoring sub-joint from the water-finding pipe string.

Example 3:

An intelligent water-finding method for horizontal wells, based on Embodiment 1 or 2, provides buoyancy for the water-finding pipe string through a volume-adjustable bag carried in the water-finding pipe string.

The method of suspending the water-finding pipe string in the well fluid in the horizontal section is to fill the bladder with fluid to expand the bag and increase the drainage volume until the water-finding pipe string is suspended as a whole.

While snorkeling in the horizontal section while looking for a string of water pipes:

Real-time monitoring of the longitudinal centering degree of the position where the bag is carried on the string of water-finding pipes, wherein the string of water-finding pipes carries at least two bags;

If the position of the bag is higher in the longitudinal direction, part of the fluid filled in the corresponding bag will be released to shrink the bag and reduce the drainage volume until the position of the bag is centered longitudinally;

If the position of the bag is low in the longitudinal direction, continue to fill the corresponding bag with fluid to expand the bag and increase the drainage volume until the position of the bag is vertically centered.

Example 4:

The intelligent water-finding method for horizontal wells based on any of the above embodiments is implemented using a water-finding pipe string as shown in Figures 2 to 4, including: a housing 1, a water-finding instrument installed in the housing 1, and a water-finding instrument for driving the water finding. The snorkeling assembly for the snorkeling of the water pipe string, the buoyancy device 2 used to provide buoyancy for the water pipe string, and the buoyancy adjustment assembly used to adjust the buoyancy of the buoyancy device 2. The snorkeling assembly includes a paddle 3 located inside the housing 1 and a first power source 4 for driving the paddle 3 to rotate. The area where the paddle 3 is located is connected to the outside of the housing 1 . The buoyancy adjustment component adjusts the buoyancy by adjusting the volume of the buoyancy device 2 .

In this embodiment, the blade 3 is a propeller, the first power source 4 is a motor, and the output end of the motor is connected to the propeller through a coupling 17 .

As shown in Figures 2 to 4, in this embodiment, a first chamber 101 and a second chamber 102 are provided inside the housing 1; the first chamber 101 is used to install a water finding instrument, and the paddle 3 is located in the second chamber. In the chamber 102, a number of annular openings 103 are opened on the surface of the housing 1 for communicating with the inside and outside of the second chamber 102.

In this embodiment, a buoyancy device 2 is provided at both ends of the water-finding instrument. Each buoyancy device 2 is equipped with a buoyancy adjustment component, which is beneficial to controlling the overall posture of the water-finding pipe string. Moreover, since the horizontal section of a horizontal well is rarely completely horizontal in engineering, and its inclination generally fluctuates within the range of 90°±5°, this embodiment can make the water finding pipe by independently controlling at least two buoyancy devices 2 at the front and rear. The posture of the string matches the well inclination of the horizontal section, which is more conducive to stable snorkeling of the water pipe string in the well.

In addition, the housing 1 in this embodiment may be an integrated structure, or may adopt a multi-section split or detachably connected structure according to the division of different short sections of the water pipe string.

Example 5:

Based on the water-finding pipe string in Embodiment 4, as shown in Figures 3 and 5, the buoyancy device 2 includes a bladder 5 located inside the shell 1, and the area where the bladder 5 is located is connected to the outside of the shell 1, and the bladder 5 5. Fill the interior with hydraulic oil.

The buoyancy adjustment assembly includes an oil cylinder 6 connected to the bladder 5 , a piston 7 located inside the oil cylinder 6 , and a second power source 8 for driving the piston 7 to move within the oil cylinder 6 .

The buoyancy adjustment assembly also includes an induction ring 9 installed on the surface of the shell 1, a number of first sensors 10 annularly distributed evenly on the induction ring 9, and a control module signally connected to the first sensors 10; the first sensors 10 are used in the induction well. Wall, the control module is used to control the second power source 8.

In this embodiment, the bag 5 is made of a material with good deformation ability; a rubber oil bag is preferably used, and is installed and positioned by an oil bag seat 18 fixed inside the housing 1 .

In this embodiment, a third chamber 104 is provided inside the housing 1. The third chamber 104 corresponds to the bag 5 one-to-one, and each bag 5 is located in the corresponding third chamber 104; each third chamber At least one induction ring 9 is correspondingly installed on the outside of 104 . A number of through holes 105 are formed on the surface of the housing 1 for communicating with the inside and outside of the third chamber 104 .

In this embodiment, the second power source 8 uses a linear push rod or a linear motor to drive the piston 7 to perform linear reciprocating motion; the first sensor 10 is preferably a distance sensor.

In this embodiment, a second sensor for sensing the circumferential posture of the water pipe string is also included, and the second sensor is signally connected to the control module. Among them, the second sensor preferably uses a gravity acceleration sensor to learn the circumferential posture of the water pipe string by sensing the direction of gravity. The second sensor can be fixedly installed at any position inside/outside the housing.

This embodiment determines the vertical centering degree through the following method:

Obtain the distance between each first sensor 10 on the induction ring 9 and the horizontal section pipe wall;

Determine the degree of dispersion of all spacings on the induction ring 9;

If the degree of dispersion is greater than the set threshold, it is specifically determined which one or more first sensors 10 are too close to the pipe wall;

Then, the sensing signal of the second sensor is obtained, and it is determined whether the first sensor 10 that is too close to the pipe wall is in a vertically upward or downward position.

In a more preferred embodiment, a guide head is provided at the bottom of the water pipe string, and the control module is installed in the guide head; the control module can use a controller such as a PLC.

In a more preferred embodiment, the piston 7 can be matched with a multi-stage cylinder liner, thereby increasing the ability to adjust the volume of the bladder 5 without making the buoyancy adjustment component too long; as shown in Figure 5, the three In the one-stage cylinder liner structure, springs are also provided between adjacent two-stage cylinder liners to assist in bag reset.

Example 6:

On the basis of the water-finding pipe string in Embodiment 4 or 5, as shown in Figures 2 to 7, it also includes an anchoring sub-joint 11 coaxially and detachably connected to the housing 1, and is used to drive the anchoring sub-joint 11. A third power source 12 is anchored in the well; the anchor sub 11 has a cable connector 13 .

In this embodiment, the detachable connection between the housing 1 and the anchoring sub-joint 11 is realized through the first butt joint part 19 and the second butt joint part 20: the first joint part 19 is provided at the bottom end of the anchor sub-joint 11, The second docking part 20 is provided at the top of the housing 1; the bottom end and the top end are the bottom direction toward the well bottom when the tool is in the well, and the top direction toward the wellhead. It also includes a clutch mechanism for docking and disengaging the first docking part 19 and the second docking part 20 from each other, and a steering mechanism for rotating the first docking part 19 .

Among them, the first docking part 19 is rotationally connected to the anchoring nipple 11 to ensure that when the first docking part rotates relative to the second docking part, the stable anchoring of the anchor nipple will not be affected.

It also includes a battery 14 arranged in the housing 1, a wireless charging transmitting module 15 arranged on the first docking part, and a wireless charging receiving module 16 arranged on the second docking part; the wireless charging receiving module 16 and the battery 14 are electrically connected Connection; when the first docking part is docked with the second docking part, the wireless charging transmitting module 15 and the wireless charging receiving module 16 are electrically connected. The battery is used to supply power to various electrical equipment inside the housing. When the first docking part and the second docking part are docked, the battery can be charged through the cable.

As shown in Figures 6 and 7, the anchoring nipple 11 in this embodiment includes a shell, a positioning frame 22 located in the shell, and an anchoring block 23 movably assembled in the positioning frame 22 in the radial direction. There are openings on the shell and Each anchor block 23 has a one-to-one corresponding notch 21 . When anchoring is not required, each anchor block 23 shrinks inwardly to the inside of the shell; when anchoring is required, the third power source 12 drives each anchor block 23 to move radially outward until it is in contact with the casing/oil pipe in the horizontal section. /Screen tube and other pipe walls are firmly in contact.

The anchor block 23 in this embodiment is a rubber block with a rough outer surface; the third power source 12 in this embodiment is a motor, and the output end of the motor realizes radial driving of each anchor block 23 through a transmission mechanism.

Preferably, the above-mentioned transmission mechanism is composed of a bevel gear and/and a screw.

As shown in Figure 7, the steering mechanism in this embodiment includes a fourth power source 24. The fourth power source 24 preferably uses a motor. The output end of the motor is connected to the first docking part 19 through a gear set to drive the first docking part. Part 19 rotates.

This embodiment also includes a third sensor disposed on the first docking part; the third sensor is used to obtain the distance and posture of the second docking part when the first docking part docks with the second docking part.

Preferably, the third sensor uses a laser radar sensor or an ultrasonic sensor, which obtains the distance and posture of the second docking part by determining the distance and circumferential orientation of the closest point on the second docking part to the first docking part.

The clutch mechanism in this embodiment can be implemented using existing clutch technology, such as the clutch structure of a motor vehicle gearbox, the docking and separation structure of a spacecraft, or an electromagnetic clutch, an electromagnet strong magnetic clutch, an underground throwing tool and a fishing tool. Cooperation, robot grabbing and letting go, etc.

Example 7:

Based on the water-finding pipe string in Embodiment 6, this embodiment designs a clutch mechanism specifically used in this application, which can realize quick disengagement and stable docking of the first docking part 19 and the second docking part 20 . specific:

As shown in Figures 7 to 10, the clutch mechanism in this embodiment includes a first mounting plate 25 located inside the first docking part 19, and a second mounting plate 26 located inside the second docking part 20;

It also includes a fifth power source 27 fixedly installed on the first mounting plate 25, a first positioning wheel 29 rotatably connected to the first mounting plate through a first rotating shaft 28, and a first buckle hinged on the first positioning wheel 29. The joint member 30, the first fastening groove 37 opened at the outer diameter end of the first positioning wheel 29, the first elastic member 31 connected between the first fastening member 30 and the first mounting plate 25; the fifth power source 27 is To drive the first positioning wheel 29 to rotate around the first rotating shaft 28;

It also includes a sixth power source 32 fixedly installed on the second installation plate 26, a second positioning wheel 34 rotatably connected to the second installation plate through the second rotating shaft 33, and a second buckle hinged on the second positioning wheel 34. The joint member 35, the second fastening groove 38 opened at the outer diameter end of the second positioning wheel 34, the second elastic member 36 connected between the second fastening member 35 and the second mounting plate 26; the sixth power source 32 is The second positioning wheel 34 is driven to rotate around the second rotating shaft 33 .

When this embodiment is working, the first docking part 19 and the second docking part 20 enter the well in a mutually docked state. At this time, as shown in Figure 10, the fifth power source 27 and the sixth power source 32 are in the initial state, and the first buckle The closing member 30 is engaged in the second engaging groove 38, the second engaging member 35 is engaged in the first engaging groove 37, and the first engaging groove 37 and the second engaging groove 38 are respectively located on the first rotating shaft. 28 and the second rotating shaft 33; in this state, since the first positioning wheel 29 and the second positioning wheel 34 cannot rotate, the entire clutch mechanism can maintain a very stable connection state, which ensures that the first docking part 19 and the second docking portion 20 are stably docked with each other.

Before using the clutch mechanism of this embodiment for docking, the water-finding tool is first adjusted to a centered state through the buoyancy adjustment component, and then the distance of the second docking part is obtained through the third sensor and the snorkeling component is controlled to fine-tune the distance. After the distance meets the docking condition, the posture of the second docking part is obtained, and then the fourth power source 24 rotates the first docking part 19 to a state that matches the posture of the second docking part 20 and is convenient for docking.

When the first docking part 19 and the second docking part 20 need to be separated from each other through the clutch mechanism of this embodiment, the fifth power source 27 and the sixth power source 32 are started to rotate the first positioning wheel 29 and drive the first buckle. The closing member 30 rotates in the direction away from the second fastening groove 38, and at the same time, the second positioning wheel 34 is rotated, driving the second fastening member 35 to rotate in the direction away from the first fastening groove 37, until the first fastening member 30 The second fastening part 35 is completely separated from the restriction of the second fastening groove 38 and the second fastening part 35 is completely separated from the restriction of the first fastening groove 37. At this time, the clutch mechanism is in the state shown in Figures 7 and 8, and the first docking part 19 is completed. and the second docking portion 20 are separated from each other.

It should be noted that what is shown in Figures 9 and 10 is a schematic diagram of a set of matching first mounting plates 25 and second mounting plates 26. Of course, two sets of matching sets as shown in Figure 7 can also be used. The structure of the first mounting plate 25 and the second mounting plate 26, or in other embodiments, more sets of first mounting plates 25 and second mounting plates 26 that match each other are used.

In the state shown in FIG. 8 , the wireless charging transmitting module 15 is located between the two first mounting boards 25 , and the wireless charging receiving module 16 is located between the two second mounting boards 26 .

In a more preferred embodiment, as shown in Figures 8 to 10, the first fastening part 30 and the second fastening part 35 each include two connecting rods facing each other, and one ends of the two connecting rods are hinged at the same time. On the corresponding first positioning wheel 29 or the second positioning wheel 34, the other ends of the two connecting rods are connected through a columnar body, which matches the corresponding first fastening groove 37 or the second fastening groove 38. ; In addition, the distance between the two connecting rods is greater than or equal to the thickness of the first positioning wheel 29 and the second positioning wheel 34.

In a more preferred embodiment, there is a gap between the first positioning wheel 29 and the first mounting plate 25 , and there is a gap between the second positioning wheel 34 and the second mounting plate 26 .

In a more preferred embodiment, when the clutch mechanisms are docked, the first elastic member 31 is used to firmly abut the first fastening member 30 in the second fastening groove 38 , and the second elastic member 36 is used to make the first fastening member 30 firmly abut against the second fastening groove 38 . The two fastening parts 35 are firmly against the first fastening groove 37 to prevent the clutch mechanism from automatically releasing the docking.

In a more preferred embodiment, both the fifth power source 27 and the sixth power source 32 are implemented using linear drives such as electric push rods. The linear drives are installed on respective corresponding mounting plates, and their output ends are in contact with the corresponding positioning plates. Articulation between wheels.

In a more preferred embodiment, when the clutch mechanism needs to be docked, the third sensor can sense the distance and position of the second fastening member 35 through laser radar or ultrasonic waves.

The above-described specific embodiments further describe the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above-mentioned are only specific embodiments of the present invention and are not intended to limit the scope of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that these entities or operations are mutually exclusive. any such actual relationship or sequence exists between them. Furthermore, the terms "comprises," "comprises," or any other variations thereof, are intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus that includes a list of elements includes not only those elements, but also elements not expressly listed or other elements inherent in the process, method, article or equipment. In addition, the term "connection" used in this article may be a direct connection or an indirect connection through other components unless otherwise specified.

Claims (6)

1. An intelligent water-finding method for horizontal wells, which is characterized by including: Lower the water-finding pipe string carrying the water-finding instrument to the horizontal section; Provide buoyancy for the water-finding pipe string so that the water-finding pipe string is suspended in the well fluid in the horizontal section; The water-finding pipe string is made to snorkel and travel in the horizontal section, and the water-finding instrument is used to find water during the traveling process; Recover the string of water pipes mentioned above; Methods for lowering the water pipe string to the horizontal section include: At the wellhead, connect the anchor nipple to the top of the water pipe string; Connect the cable to the anchoring sub; Release the cable and lower the water pipe string to the predetermined well depth; Anchor the anchor sub at the current position; Detach the water pipe string from the anchoring nipple; The water-finding pipe string carries a battery and a wireless charging receiving module electrically connected to the battery; the anchoring nipple carries a wireless charging transmitting module that matches the wireless charging receiving module; When the anchoring nipple is connected to the water pipe string, the wireless charging transmitting module and the wireless charging receiving module are electrically connected; During the process of releasing the cable, the battery is charged through the cable; During the snorkeling process of the water-finding pipe string in the horizontal section, when the battery power is lower than the set threshold, the water-finding pipe string is snorkeled back to the anchoring sub-joint, reconnected to the anchoring sub-joint, and then connected to the anchoring sub-joint through the cable. The battery is charged; Methods for recycling the water pipe string include: Snorkel the water pipe string back to the anchoring nipple and reconnect it to the anchoring nipple; Unanchor the anchor sub at the current position; The cable is recovered at the wellhead and the anchoring sub-joint and water pipe string are lifted simultaneously. 2. An intelligent water-finding method for horizontal wells according to claim 1, characterized in that during the process of lowering the water-finding pipe string to the horizontal section, the buoyancy force on the water-finding pipe string is less than the gravity of the water-finding pipe string. 3. An intelligent water-finding method for horizontal wells according to claim 1, characterized in that the anchoring nipple and the water-finding pipe string are connected through a clutch mechanism, and the clutch mechanism is used to make the anchor nipple Connect and disconnect with the water pipe string. 4. An intelligent water-finding method for horizontal wells according to claim 1, characterized in that the volume-adjustable bag carried in the water-finding pipe string provides buoyancy for the water-finding pipe string. 5. An intelligent water-finding method for horizontal wells according to claim 4, characterized in that the method of suspending the water-finding pipe string in the well fluid in the horizontal section includes: filling the bladder with fluid to expand the bladder; The drainage volume increases until the water pipe string is suspended as a whole. 6. An intelligent water-finding method for horizontal wells according to claim 5, characterized in that while the water-finding pipe string is snorkeling in the horizontal section: Real-time monitoring of the longitudinal centering degree of the position where the bag is carried on the string of water-finding pipes, wherein the string of water-finding pipes carries at least two bags; If the position of the bag is higher in the longitudinal direction, part of the fluid filled in the corresponding bag will be released to shrink the bag and reduce the drainage volume until the position of the bag is centered longitudinally; If the position of the bag is low in the longitudinal direction, continue to fill the corresponding bag with fluid to expand the bag and increase the drainage volume until the position of the bag is longitudinally centered.