Completion and stimulation equipment

Abstract

The present invention discloses a completion and production increase device, which belongs to the technical field of oil and gas development equipment. The device includes a shell, a guide, a plurality of flexible drill rods, a plurality of near-drill bit speed-increasing and straightening power structures, and a plurality of drill bits; the guide is installed on the inner wall of the shell; the guide is provided with a plurality of guide through holes, and the shell is provided with openings corresponding to the plurality of guide through holes; the first end of each flexible drill rod is suitable for connecting with a drilling fluid collection device, and the second end passes through the corresponding guide through hole and opening in sequence; the plurality of near-drill bit speed-increasing and straightening power structures correspond to the plurality of flexible drill rods one by one, and the first end of each near-drill bit speed-increasing and straightening power structure is connected to the second end of the corresponding flexible drill rod; the plurality of drill bits correspond to the plurality of near-drill bit speed-increasing and straightening power structures one by one, and the second end of each near-drill bit speed-increasing and straightening power structure is connected to the corresponding drill bit. Multi-branch completion and production increase are achieved with a simple structure.

Description

Technical Field

[0001] The invention relates to the technical field of oil and gas development equipment, and in particular to a well completion and production enhancement device. Background Art

[0002] Oil and gas well stimulation technology is a technical process to improve the production capacity of oil and gas wells, usually using fracturing technology, perforation technology or multi-branch drilling technology. Since multi-branch drilling technology does not require expensive large equipment or a large number of operators during the operation process, it only needs to use the original drilling tools and drilling personnel to lower the stimulation tools into the well to carry out the operation. Therefore, this technology is more convenient and has gradually replaced other more complex oil and gas well stimulation technologies.

[0003] In the related art, the device for increasing production by using multi-branch drilling technology usually needs to use an additional power source to provide power to several drill pipes in the main wellbore, so that the drill pipes drill forward, thereby completing the development of branch wells and achieving increased production.

[0004] In the process of implementing the present invention, the inventors found that the related technology has at least the following problems:

[0005] Since the power device needs to be driven centrally, the power device output power may be insufficient, resulting in a stagnation of operations. At the same time, in high-temperature and high-pressure formations, due to the rotation of the power device and the torsional deformation of the flexible drill pipe, not only will the various components in the well interfere with each other, but multiple flexible drill pipes may also become entangled, resulting in part of the drill pipe remaining in the formation and the other part of the drill pipe remaining in the drill tool, thereby affecting the production increase effect of the device and the progress of subsequent oil and gas field development. In addition, due to the limitations of the drill tool length and the power output of the power device, the device in the related art cannot support the simultaneous drilling of multiple branches of drill pipes. Summary of the invention

[0006] In view of this, the present application provides a well completion and production enhancement device, which realizes multi-branch well completion and production enhancement with a simple structure.

[0007] Specifically, the following technical solutions are included:

[0008] The embodiment of the present application provides a well completion and production stimulation device, which includes a housing, a guide, a plurality of flexible drill rods, a plurality of near-drill-bit speed-increasing and righting power structures, and a plurality of drill bits;

[0009] The first end of the housing is suitable for being connected to a lifting device;

[0010] The guide is mounted on the inner wall of the second end of the housing;

[0011] The guide is provided with a plurality of guide through holes, and the housing is provided with openings corresponding to the plurality of guide through holes one by one;

[0012] The first end of each of the flexible drill rods is suitable for connecting to a drilling fluid collection device, and the second end passes through the corresponding guide through hole and the opening in sequence;

[0013] The plurality of near-bit speed-increasing and straightening power structures correspond one to one with the plurality of flexible drill rods, and the first end of each near-bit speed-increasing and straightening power structure is connected to the second end of the corresponding flexible drill rod;

[0014] The plurality of drill bits correspond one to one with the plurality of near-drill-bit speed-increasing and straightening power structures, and the second end of each near-drill-bit speed-increasing and straightening power structure is connected to the corresponding drill bit.

[0015] Optionally, the outer wall of the guide is connected to the inner wall of the second end of the housing via a thread;

[0016] The guide and the housing are fixed together by a first bolt and a second bolt.

[0017] Optionally, the near-bit speed-increasing and straightening power structure comprises a straightener;

[0018] The centralizer comprises a central central shaft and a plurality of centralizing shells;

[0019] Each of the centralizing shells is sleeved on the outer wall of the central central axis;

[0020] The central axis of the straightening device is provided with a through hole;

[0021] The second end of the flexible drill rod penetrates into the through hole.

[0022] Optionally, the near-bit speed-increasing and righting power structure further includes a compound pendulum drag reducer;

[0023] The second end of the flexible drill rod is connected to the first end of the compound oscillation drag reducer.

[0024] Optionally, the compound pendulum drag reducer comprises a compound pendulum drag reducer housing, and a multi-degree-of-freedom fixed shaft and a driving block connected to each other are arranged inside the compound pendulum drag reducer housing.

[0025] Optionally, the inner wall of the first end of the compound oscillation drag reducer housing is provided with two opposite protrusions;

[0026] Each of the protrusions is provided with a semicircular groove, and the openings of the two grooves are opposite to each other;

[0027] The multi-degree-of-freedom fixed shaft is clamped in the gap formed by the groove.

[0028] Optionally, the near-bit speed-increasing and righting power structure further includes a drilling fluid guide;

[0029] The first end of the drilling fluid guide is connected to the second end of the compound pendulum drag reducer.

[0030] Optionally, the drilling fluid guide comprises a drilling fluid guide housing and a central speed increasing cylinder;

[0031] The central speed increasing cylinder is installed on the inner wall of the outer shell of the drilling fluid guide.

[0032] Optionally, the drilling fluid guide housing and the central speed increasing cylinder are fixed together by bolts.

[0033] Optionally, the near-bit speed-increasing and straightening power structure further includes a power screw;

[0034] The first end of the power screw is connected to the second end of the drilling fluid guide;

[0035] The second end of the power screw is connected to the drill bit.

[0036] The beneficial effects of the technical solution provided by the embodiments of the present application include at least:

[0037] The flow rate of the drilling fluid passed into the flexible drill pipe is used to drive the drill bit to drill into the formation continuously, and the direction of the drill bit is controlled by the near-drill-bit speed-increasing and straightening power structure, thereby realizing the development of branch wells. Since the flexible drill pipe only serves as a drilling fluid supply channel, that is, the flexible drill pipe will not generate large torque and tension and compression, the flexible drill pipe will not be torsionally deformed or even entangled. At the same time, since there is no need to install an additional power device, it can not only avoid the rotation of the additional power device from interfering with other components in the well, but also avoid the situation where the power device output power is insufficient, so it can support the simultaneous drilling of multiple branches. In addition, the drill bit is driven to drill into the formation by the flow rate of the drilling fluid, which makes the device structure simpler and more convenient to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0039] Figure 1 is a cross-sectional view of a well completion and production enhancement device provided in an embodiment of the present application;

[0040] Figure 2 It is a cross-sectional view of a near-bit speed-increasing and righting power structure in a well completion and production enhancement device provided in an embodiment of the present application;

[0041] Figure 3 It is a perspective schematic diagram of a centralizer of a near-bit speed-increasing centralizing power structure in a well completion and production enhancement device provided in an embodiment of the present application;

[0042] Figure 4 It is a cross-sectional view of a compound swing drag reducer of a near-drill-bit speed-increasing and righting power structure in a well completion and production enhancement device provided in an embodiment of the present application;

[0043] Figure 5 It is a cross-sectional view of a drilling fluid guide of a near-drill-bit speed-increasing and righting power structure in a well completion and production enhancement device provided in an embodiment of the present application.

[0044] The reference numerals in the figures represent respectively:

[0045] 1- housing;

[0046] 2-guide;

[0047] 3-Flexible drill pipe;

[0048] 4-Near-bit speed-increasing and righting power structure;

[0049] 5-Drill bit;

[0050] 6- first bolt;

[0051] 7- second bolt;

[0052] 8- Centralizer:

[0053] 81-central axis of the center, 82-central shell, 821-first central shell, 822-second central shell;

[0054] 9- Compound swing drag reducer:

[0055] 91-compound pendulum drag reducer housing, 911-protrusion, 92-multi-freedom fixed axis, 921-first part, 922-second part, 923-third part, 93-driving block;

[0056] 10-Drilling fluid guide:

[0057] 1001-drilling fluid guide housing, 1002-center speed increasing cylinder;

[0058] 11-power screw;

[0059] 12- third bolt;

[0060] 13- fourth bolt;

[0061] 14- fifth bolt;

[0062] 15-Sixth bolt.

[0063] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0064] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0065] Before further describing the implementation methods of the present application in detail, the directional nouns involved in the embodiments of the present application are based on the directions shown in the figures and are only used to clearly describe the completion and production enhancement device of the embodiments of the present application, and do not have the meaning of limiting the scope of protection of the present application.

[0066] The implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0067] Combination Figure 1 and Figure 2 As shown, an embodiment of the present application provides a completion and production enhancement device, which includes a shell 1, a guide 2, a plurality of flexible drill rods 3, a plurality of near-drill bit speed-increasing and straightening power structures 4 and a plurality of drill bits 5.

[0068] The first end of the housing 1 is suitable for being connected to a lifting device, and the guide 2 is mounted on the inner wall of the second end of the housing 1 .

[0069] The guide 2 is provided with a plurality of guide through holes, and the housing 1 is provided with openings corresponding to the plurality of guide through holes one by one.

[0070] The first end of each flexible drill rod 3 is suitable for connecting to a drilling fluid collection device, and the second end passes through the corresponding guide through hole and opening in sequence.

[0071] The plurality of near-bit speed-increasing and straightening power structures 4 correspond one-to-one to the plurality of flexible drill rods 3 , and the first end of each near-bit speed-increasing and straightening power structure 4 is connected to the second end of the corresponding flexible drill rod 3 .

[0072] The plurality of drill bits 5 correspond one to one with the plurality of near-drill-bit speed-increasing and straightening power structures 4 , and the second end of each near-drill-bit speed-increasing and straightening power structure 4 is connected to the corresponding drill bit 5 .

[0073] It should be noted that during the drilling process, the depth of the oil and gas reservoir is different, so the depth of the drilling is also different. The length of the housing 1 and the flexible drill pipe 3 of the completion and production stimulation device is set accordingly according to the required length of the drilling. Figure 1 The diagram shows that the length of a portion of the housing 1 and the flexible drill rod 3 replaces the length of the entire housing 1 and the flexible drill rod 3 .

[0074] It is understandable that, since different oil and gas reservoirs need to increase production and the number of branch wells to be developed is different, the number of flexible drill pipes 3 can be set as needed. Figure 1 As shown, two flexible drill pipes 3 are provided to develop two branch wellbores.

[0075] In some embodiments of the present application, the housing 1 may be a drill rod for drilling a main wellbore, and the diameter of the housing 1 is greater than the diameter of the flexible drill rod 3 .

[0076] It should be noted that the process of branch well development is as follows:

[0077] Step 1: Drill the main wellbore using the casing 1.

[0078] Step 2: According to the preset positions of the multiple branch wells to be developed, each flexible drill pipe 3 is passed through the corresponding guide through hole and opening in turn, and extends out of the outer wall of the shell 1.

[0079] Step 3: Introduce drilling fluid and drive the drill bit into the formation to form a branch wellbore.

[0080] Step 4: After the flexible drill rod 3 is completely drilled into the formation, the flexible drill rod 3 is left in the formation to form an oil and gas field production increase channel; the casing 1 and the guide 2 are removed as needed.

[0081] In some embodiments of the present application, the drilling fluid collected by the drilling fluid collection device may be fluids such as mud, clean water, clay-free flushing fluid, emulsion, foam or compressed air.

[0082] In summary, the completion and production-increasing device provided in the embodiment of the present application utilizes the flow rate of the drilling fluid introduced into the flexible drill pipe 3 to drive the drill bit 5 to continuously drill into the formation, and controls the forward direction of the drill bit 5 through the near-drill bit speed-increasing and straightening power structure 4, thereby realizing the development of branch wells. Since the flexible drill pipe 3 only serves as a drilling fluid supply channel, that is, the flexible drill pipe 3 will not generate a large torque and tension and compression, the flexible drill pipe 3 will not be torsionally deformed or even entangled. At the same time, since there is no need to install an additional power device, it can not only avoid the rotation of the additional power device from interfering with other components in the well, but also avoid the situation where the power output power of the power device is insufficient, so it can support the simultaneous drilling of multiple branches. Furthermore, the drill bit 5 is driven to drill into the formation by the flow rate of the drilling fluid, so that the structure of the completion and production-increasing device is simpler and the operation is more convenient.

[0083] Combine the following Figure 1 The structure and function of each component unit of the well completion and production stimulation device provided in this embodiment are described in more detail.

[0084] In some embodiments of the present application, the drill bit 5 may be a twist drill, a flat drill, a reaming drill or a deep hole drill as required.

[0085] In some embodiments of the present application, the outer wall of the guide 2 is connected to the inner wall of the second end of the shell 1 through threads.

[0086] like Figure 1 As shown, the guide 2 and the housing 1 are fixed together by a first bolt 6 and a second bolt 7 .

[0087] In some embodiments of the present application, a first mounting hole and a second mounting hole are provided on the guide 2, and a third mounting hole and a fourth mounting hole are provided on the housing 1.

[0088] The first mounting hole corresponds to the third mounting hole, and the second mounting hole corresponds to the fourth mounting hole.

[0089] The first bolt 6 passes through the first mounting hole and the third mounting hole in sequence, and the second bolt 7 passes through the second mounting hole and the fourth mounting hole in sequence, thereby fixing the guide 2 to the housing 1 .

[0090] Combination Figure 1 , Figure 2 and Figure 3 As shown, in some embodiments of the present application, the near-bit speed-increasing and straightening power structure 4 includes a straightener 8.

[0091] The centralizer 8 includes a central central shaft 81 and a plurality of centralizing shells 82 .

[0092] Each of the straightening housings 82 is sleeved on the outer wall of the straightening central shaft 81. The straightening central shaft 81 is provided with an axial through hole. The second end of the flexible drill rod 3 penetrates into the through hole.

[0093] In some embodiments of the present application, Figure 3 As shown, two straightening shells 82 with the same structure are sleeved on the outer wall of the straightening central shaft 81.

[0094] like Figure 3 As shown, in some embodiments of the present application, the centralizing housing 82 includes a first centralizing housing 821 and a second centralizing housing 822. The first centralizing housing 821 is close to the first end of the central axis 81, and the second centralizing housing 822 is close to the second end of the centralizing housing 82.

[0095] It should be noted that the centralizer 8 can not only effectively prevent the drilling tool from scraping the well wall and reduce friction resistance, but also can prevent irregular wellbore caused by drill bit deflection, because the centralizer 8 can control the well inclination angle and wellbore curvature within the specified range, reduce the non-wellbore center force or other external forces on the drill pipe and drill bit, and thus improve the wellbore quality and drilling speed.

[0096] like Figure 2 As shown, in some embodiments of the present application, the near-bit speed-increasing and straightening power structure 4 further includes a compound swing drag reducer 9.

[0097] The second end of the flexible drill rod 3 is connected to the first end of the compound pendulum drag reducer 9 .

[0098] In some embodiments of the present application, the outer wall of the second end of the flexible drill rod 3 is provided with threads, and the inner wall of the first end of the compound oscillation drag reducer 9 is provided with threads, and the second end of the flexible drill rod 3 is connected to the first end of the compound oscillation drag reducer 9 by threads.

[0099] like Figure 2 and Figure 4 As shown, in some embodiments of the present application, the compound oscillation drag reducer 9 includes a compound oscillation drag reducer housing 91 , inside which a multi-degree-of-freedom fixed shaft 92 and a driving block 93 that are interconnected are provided.

[0100] like Figure 4 As shown, in some embodiments of the present application, a first part 921, a second part 922 and a third part 923 are sequentially connected from the first end to the second end of the multi-degree-of-freedom fixed shaft 92.

[0101] The outer wall of the first part 921 is provided with threads, the second part 922 is configured as a sphere, and the outer wall of the third part 923 is provided with threads.

[0102] like Figure 4 As shown, in some embodiments of the present application, the inner wall of the first end of the compound oscillation drag reducer housing 91 is provided with two opposite protrusions 911 .

[0103] Each protrusion 911 is provided with a semicircular groove, and the two grooves are opened opposite to each other. The multi-freedom fixed shaft 92 is clamped in the gap formed by the grooves.

[0104] In some embodiments of the present application, the protrusion 911 and the compound pendulum drag reducer housing 91 may be integrally formed or may be formed independently of each other.

[0105] It should be noted that if Figure 4 As shown, when the protrusion 911 and the compound oscillating drag reducer housing 91 are formed independently of each other, each protrusion 911 is fixed to the compound oscillating drag reducer housing 9 by bolts.

[0106] It can be understood that the second portion 922 of the multi-degree-of-freedom fixed shaft 92 can rotate at a high speed under the impact drive of the drilling fluid, thereby driving various parts of the tool of the device to operate in a coaxial manner.

[0107] In some embodiments of the present application, the inner wall of the second end of the flexible drill rod 3 is provided with a thread, the first part 921 of the multi-degree-of-freedom fixed shaft 92 is connected to the second end of the flexible drill rod 3 by a thread, and the second part 922 of the multi-degree-of-freedom fixed shaft 92 is connected to the first end of the driving block 93 by a thread.

[0108] In some embodiments of the present application, the driving block 93 may be a structure such as a turbine or an impeller that can provide power.

[0109] It should be noted that the drilling fluid flows through the entire near-drill bit speed-increasing and straightening power structure 4. Under the impact driving action of the drilling fluid, the driving block 93 of the compound pendulum drag reducer 9 rotates at a high speed, driving the near-drill bit speed-increasing and straightening power structure 4 to rotate at a high speed to produce a gyroscopic compound pendulum effect, thereby effectively correcting the deviation during the drilling process and improving the effectiveness and efficiency of drilling.

[0110] It is understandable that during the drilling process, the drill bit 5 or the drilling tool will rotate regularly and irregular vortex phenomenon will occur. It should be noted that the vortex phenomenon refers to the loss of stability of the drill bit 5 or other drilling tools due to the unbalanced dynamic force, so that the center position of the drill bit 5 or other drilling tools rotates constantly, and it is impossible to drill along the preset center position, thereby affecting the development of the branch wellbore.

[0111] Moreover, due to the vortex phenomenon, the acceleration of the drill bit 5 increases, causing the drill bit 5 to collide with the rock formation with a large impact force. Not only is the cutting of the drill bit 5 unstable, but the service life of the drill bit 5 is also reduced due to the excessive impact force. The setting of the compound pendulum drag reducer 9 will suppress the axial bounce or vortex of the drill bit 5 or other drilling tools, making the movement of the drill bit 5 more stable, thereby not only ensuring that the drill bit 5 moves in the preset drilling direction, but also reducing the interactive oscillation between the drill bit 5 and the surrounding drilling tools. Therefore, the setting of the compound pendulum drag reducer 9 improves the drilling efficiency and increases the service life of the drill bit 5.

[0112] like Figure 5 As shown, in some embodiments of the present application, the near-bit speed-increasing and straightening power structure 4 further includes a drilling fluid guide 10 .

[0113] The first end of the drilling fluid guide 10 is connected to the second end of the compound pendulum drag reducer 9 .

[0114] In some embodiments of the present application, the drilling fluid guide 10 includes a drilling fluid guide housing 1001 and a central speed increasing cylinder 1002 .

[0115] The central speed increasing cylinder 1002 is installed on the inner wall of the drilling fluid guide housing 1001 .

[0116] In some embodiments of the present application, Figure 5 As shown, the inner wall diameter of the central speed increasing cylinder 1002 gradually decreases from the first end to the second end.

[0117] It is understandable that, since the rock cuttings generated by the working surface of the drill bit 5 during the drilling process are carried to the ground through the circulation of the drilling fluid, when the speed at which the rock cuttings at the bottom of the well are transported to the ground is accelerated, the working efficiency of the drill bit 5 will also be improved. During the use of the completion and production enhancement device, the drilling fluid will flow through the interior of the central speed increasing cylinder 1002. Since the drilling fluid will increase in velocity when it flows from a channel with a large diameter to a channel with a small diameter, the rock carrying capacity of the drilling fluid can be improved; at the same time, since the faster drilling fluid can also clean the drilled rock surface in time, the wear of the rock cuttings on the drill bit 5 is reduced, thereby improving the mechanical drilling speed and service life of the drill bit 5.

[0118] In some embodiments of the present application, the drilling fluid guide housing 1001 and the central speed increasing cylinder 1002 are fixed together by bolts.

[0119] It can be understood that the number of bolts for fixing the drilling fluid guide housing 1001 and the central speed increasing cylinder 1002 is set according to needs.

[0120] In some embodiments of the present application, Figure 5As shown, a fifth mounting hole, a sixth mounting hole, a seventh mounting hole and an eighth mounting hole are provided on the central speed increasing cylinder 1002 , and a ninth mounting hole, a tenth mounting hole, an eleventh mounting hole and a twelfth mounting hole are provided on the drilling fluid guide housing 1001 .

[0121] Among them, the fifth mounting hole corresponds to the ninth mounting hole, the sixth mounting hole corresponds to the tenth mounting hole, the seventh mounting hole corresponds to the eleventh mounting hole, and the eighth mounting hole corresponds to the twelfth mounting hole.

[0122] The third bolt passes through the fifth mounting hole and the ninth mounting hole for fixing at the same time, the fourth bolt passes through the sixth mounting hole and the tenth mounting hole for fixing at the same time, the fifth bolt passes through the seventh mounting hole and the eleventh mounting hole for fixing at the same time, and the sixth bolt passes through the eighth mounting hole and the twelfth mounting hole for fixing at the same time.

[0123] In some embodiments of the present application, the near-bit speed-increasing and straightening power structure 4 further includes a power screw 11 .

[0124] The first end of the power screw 11 is connected to the second end of the drilling fluid guide 10 ; the second end of the power screw 11 is connected to the drill bit 5 .

[0125] In some embodiments of the present application, the power screw 11 may be a micro-vibration power screw.

[0126] It can be understood that the vibration amplitude of the micro-vibration power screw is small, which can ensure that no large amplitude will be generated during the advancement of the drill bit 5. Therefore, the drill bit can move forward along the preset drilling direction more accurately, so that the branch wellbore of the well can be better developed and completed, and the subsequent oil and gas field production increase effect will be more obvious.

[0127] It should be noted that the first end of the power screw 11 is movably connected to the second end of the drilling fluid guide 10 .

[0128] It can be understood that the power screw 11 rotates under the hydraulic impact of the drilling fluid to generate rock-breaking power; at the same time, during the rotation of the power screw 11, since the power screw 11 is a micro-vibration power screw, it will generate tiny vibrations, which can not only reduce the friction between the drilling tool and the well wall, protect the well wall and the drilling tool, but also improve the rock-breaking efficiency of the drill bit through the auxiliary effect of micro-vibration and increase the mechanical drilling speed.

[0129] It should be noted that the completion and production enhancement device provided in the embodiment of the present application can be used for the development of multiple branch wellbores in a vertical well, an inclined well or a horizontal well.

[0130] In summary, when drilling operations are carried out, the completion and production-increasing device provided in the embodiment of the present application is located above the guide shoe. The completion and production-increasing device utilizes the flow rate of the drilling fluid passed into the flexible drill pipe 3 to drive the drill bit 5 to continuously drill into the formation, and controls the forward direction of the drill bit 5 through the near-drill bit speed-increasing and straightening power structure 4, thereby realizing the development of branch wells. Since the flexible drill pipe 3 only serves as a drilling fluid supply channel, that is, the flexible drill pipe 3 will not generate a large torque and tension and compression, the flexible drill pipe 3 will not be torsionally deformed or even entangled. At the same time, since there is no need to install an additional power device, it can not only avoid the rotation of the additional power device from interfering with other components in the well, but also avoid the situation where the power device output power is insufficient, so it can support the simultaneous drilling of multiple branches. Furthermore, the drill bit 5 is driven to drill into the formation by the flow rate of the drilling fluid, so that the completion and production-increasing device has a simpler structure and is more convenient to operate.

[0131] The straightener 8 in the near-bit speed-increasing and straightening power structure 4 can not only effectively prevent the drilling tool from scratching the well wall and reduce friction resistance; the straightener 8 can also control the well inclination angle and wellbore curvature within the specified range. The high-speed rotation of the drive block 93 drives the near-bit speed-increasing and straightening power structure 4 to rotate at high speed to produce a gyroscopic pendulum effect, thereby effectively correcting the deviation during drilling; the inner wall diameter of the central speed-increasing cylinder 1002 of the drilling fluid guide 10 gradually decreases from the first end to the second end, so that the speed of the drilling fluid flowing through the central speed-increasing cylinder 1002 increases, which not only improves the rock carrying capacity of the drilling fluid, but also can clean the drilled rock surface in time. The setting of the near-bit speed-increasing and straightening power structure 4 allows the drill bit 5 to drill more accurately along the preset branch wellbore, thereby improving the accuracy and effectiveness of the branch wellbore development, and providing a more accurate oil and gas production increase channel for subsequent production increase work.

[0132] In the present application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. The term "plurality" refers to two or more than two, unless otherwise clearly defined.

[0133] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the present application disclosed herein. The present application is intended to cover any variations, uses or adaptations of the present application, which follow the general principles of the present application and include common knowledge or customary techniques in the art that are not disclosed in the present application. The specification and examples are intended to be exemplary only.

[0134] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A well completion and production stimulation device, characterized in that: The device comprises a housing (1), a guide (2), a plurality of flexible drill rods (3), a plurality of near-drill-bit speed-increasing and straightening power structures (4), and a plurality of drill bits (5); The first end of the housing (1) is suitable for being connected to a lifting device; The guide (2) is mounted on the inner wall of the second end of the housing (1); The guide (2) is provided with a plurality of guide through holes, and the housing (1) is provided with openings corresponding one to one to the plurality of guide through holes; The first end of each of the flexible drill rods (3) is suitable for connecting to a drilling fluid collection device, and the second end passes through the corresponding guide through hole and the opening in sequence; A plurality of near-drill-bit speed-increasing and straightening power structures (4) correspond to a plurality of flexible drill rods (3) one by one, and a first end of each near-drill-bit speed-increasing and straightening power structure (4) is connected to a second end of a corresponding flexible drill rod (3); the near-drill-bit speed-increasing and straightening power structure (4) further comprises a compound pendulum drag reducer (9); the second end of the flexible drill rod (3) is connected to a first end of the compound pendulum drag reducer (9); the compound pendulum drag reducer (9) comprises a compound pendulum drag reducer housing (91), and a multi-degree-of-freedom fixed shaft (92) and a driving block (93) connected to each other are arranged inside the compound pendulum drag reducer housing (91); two opposite protrusions (911) are arranged on an inner wall of a first end of the compound pendulum drag reducer housing (91); each of the protrusions (911) is provided with a semicircular groove, and the openings of the two grooves are opposite to each other; the multi-degree-of-freedom fixed shaft (92) is clamped in a gap formed by the grooves; The plurality of drill bits (5) correspond one to one with the plurality of near-drill-bit speed-increasing and straightening power structures (4), and the second end of each near-drill-bit speed-increasing and straightening power structure (4) is connected to the corresponding drill bit (5).

2. The device according to claim 1, characterized in that The outer wall of the guide (2) is connected to the inner wall of the second end of the housing (1) via a thread; The guide (2) and the housing (1) are fixed together by a first bolt (6) and a second bolt (7).

3. The device according to claim 1, characterized in that The near-bit speed-increasing and straightening power structure (4) comprises a straightener (8); The centralizer (8) comprises a central central shaft (81) and a plurality of centralizing shells (82); Each of the centralizing shells (82) is sleeved on the outer wall of the central central shaft (81); The central axis (81) is provided with a through hole; The second end of the flexible drill rod (3) penetrates into the through hole.

4. The device according to claim 1, characterized in that The near-drill-bit speed-increasing and righting power structure (4) further includes a drilling fluid guide (10); The first end of the drilling fluid guide (10) is connected to the second end of the compound oscillating drag reducer (9).

5. The device according to claim 4, characterized in that The drilling fluid guide (10) comprises a drilling fluid guide housing (1001) and a central speed increasing cylinder (1002); The central speed increasing cylinder (1002) is installed on the inner wall of the drilling fluid guide housing (1001).

6. The device according to claim 5, characterized in that The drilling fluid guide housing (1001) and the central speed increasing cylinder (1002) are fixed together by bolts.

7. The device according to claim 4, characterized in that The near-drill-bit speed-increasing and straightening power structure (4) further comprises a power screw (11); The first end of the power screw (11) is connected to the second end of the drilling fluid guide (10); The second end of the power screw (11) is connected to the drill bit (5).

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