A linkage bypass valve and continuous circulation drilling equipment

Abstract

The present invention discloses a linkage bypass valve and equipment for continuous circulation drilling, the bypass valve includes a valve body, a built-in ball valve, a ball valve knob, a cam, an outflow sleeve, a sleeve and a spring, a built-in ball valve is arranged in the valve body, the built-in ball valve is driven to rotate by a ball valve knob arranged on the valve body, the ball valve knob is fixedly connected to a camshaft of a cam arranged in the valve body, the valve body also includes an outflow sleeve abutting against the cam, the outflow sleeve abutting against the sleeve, the sleeve abutting against the spring, a first perforation is arranged on the sleeve, and a second perforation corresponding to the first perforation is arranged on the valve body. The above technical scheme realizes the linkage of the internal mechanism of the bypass valve through the arrangement of the cam, the sleeve and the spring, and facilitates the on-off control of the bypass; and the combination of the cam and the outflow sleeve can prevent the valve body from getting stuck after sand enters the inside, and can adapt to the use scenarios in harsh environments such as coalbed methane wells.

Description

Technical Field

[0001] The invention belongs to the technical field of valve manufacturing, and relates to a linkage bypass valve, in particular to a continuous circulation drilling device. Background Art

[0002] As a clean and green unconventional natural gas energy, coalbed methane is now receiving more and more attention. China is a major coal consumer, with the largest consumption in the world. It also has relatively rich coal resources, and coal resources contain considerable coalbed methane resources. On the other hand, in the coalbed drilling system, the stability of the wellbore is crucial. Water entering the coal seam is one of the main reasons for the instability of the coal rock wellbore. The forms of water in the drilling fluid include chemically bound water, adsorbed water, and free water. When drilling into the upper strata of the coal reservoir using conventional water-based mud, there will be leakage and low mechanical drilling speed. At the same time, the capillary self-absorption of coal rock in the formation and the pressure difference can easily enter the coal seam and destroy the coal reservoir, affecting the later drainage of coalbed methane. In order to maximize the mechanical drilling speed, reduce coal reservoir damage, reduce formation leakage, shorten the drilling cycle, and reduce the overall drilling cost, my country has gradually introduced air drilling technology in the coalbed methane drilling process in recent years. In order to avoid accidents such as sand settling and drill sticking caused by imbalance of drilling circulation displacement and equivalent circulation density and fluctuation of downhole pressure due to the connection and unloading of single pipes during air drilling, continuous circulation drilling has become an important technical means to prevent sand settling and drill sticking in recent years, and continuous circulation valve is a necessary equipment for continuous circulation drilling.

[0003] For the above application scenarios, however, the existing continuous circulation valves have the following problems: the coalbed methane well occupies the channel during maintenance and repair, affecting the air dynamics input into the well by the ground station; the drilling circulation displacement and equivalent circulation density are uneven, and the downhole pressure fluctuates greatly; sediment deposition causes problems such as drill sticking, drill rod, and drill tool damage; the strong pressure applied to the valve itself during opening and closing produces greater resistance, and the valve opening and closing efficiency is low; and the valve has an adverse effect on the control accuracy of the flow. Summary of the invention

[0004] In view of the above problems, the present invention discloses a linkage bypass valve and a continuous circulation drilling device to overcome the above problems or at least partially solve the above problems.

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

[0006] On the one hand, an embodiment of the present invention discloses a linked bypass valve, which includes a valve body, a built-in ball valve, a ball valve knob, a cam, an outflow collar, a sliding sleeve and a spring. The built-in ball valve is arranged in the valve body, and the built-in ball valve is driven to rotate by a ball valve knob arranged on the valve body. The ball valve knob is fixedly connected to a camshaft of a cam arranged in the valve body. The valve body also includes an outflow collar abutting the cam, the outflow collar abutting the sliding sleeve, the sliding sleeve abutting the spring, and a first perforation is arranged on the sliding sleeve, and a second perforation corresponding to the first perforation is arranged on the valve body.

[0007] Optionally, an external gear is provided on the camshaft at a position on one side of the cam, an internal gear is provided on the ball valve at a position corresponding to the external gear, and a planetary gear is provided between the external gear and the internal gear.

[0008] Optionally, the number of teeth of the internal gear is an even multiple of the number of teeth of the external gear.

[0009] Optionally, the number of teeth of the inner gear is twice the number of teeth of the outer gear, the planetary gears are evenly distributed in an array on a circular ring with the inner gear as the center, and the center position of each planetary gear remains relatively stationary with the ball valve.

[0010] Optionally, a sliding sleeve knob is provided on the second perforation.

[0011] Optionally, the sliding sleeve knob and the ball valve knob are staggered by 90 degrees on the valve body.

[0012] Optionally, the linked bypass valve also includes a flow-aiding inner cylinder, which is arranged in the valve body close to the built-in ball valve and on a different side from the outlet ring. The flow-aiding inner cylinder is fixedly connected to the valve body, and a plurality of petal-shaped guide grooves in a uniform array are arranged on the inner side of the flow-aiding inner cylinder.

[0013] Optionally, the groove-shaped structure of each of the petal-shaped guide grooves is arranged on a side away from the built-in ball valve, and the arc-shaped structure of the petal-shaped guide groove is arranged on a side close to the built-in ball valve.

[0014] Optionally, an annular protrusion is provided on the outflow collar, and the cam abuts against the annular protrusion.

[0015] Another aspect of the embodiment of the present invention discloses a continuous circulation drilling device, wherein the continuous circulation drilling device adopts the linkage bypass valve according to any one of the above items as a continuous circulation valve.

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

[0017] 1. The technical solution disclosed in the embodiment of the present invention realizes the linkage of the internal mechanism of the bypass valve through the arrangement of the cam, the sliding sleeve and the spring, etc., which facilitates the on-off control of the bypass. In addition, the combination of the cam and the outflow collar can prevent the valve body from getting stuck after sand enters the inside, and can adapt to the use scenarios in harsh environments such as coalbed methane wells;

[0018] Second, the above technical solution uses a planetary gear reduction method to achieve the switching of different working modes of the bypass valve, which can reduce the force required in the switching process between the main channel and the bypass channel of the valve;

[0019] 3. The inner wall of the flow-aiding inner tube has petal-shaped guide grooves that can make the fluid move along the streamline direction when passing through, decompose part of the fluid pressure to the direction perpendicular to the original airflow, and balance the force in the plane perpendicular to the original airflow direction, which can reduce the damage to the valve body itself and avoid the impact of strong fluid on the components inside the valve body. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0021] Figure 1 A structural diagram of a linkage bypass valve in one embodiment of the present invention;

[0022] Figure 2 A bottom view of a flow-aiding inner cylinder in one embodiment of the present invention;

[0023] Figure 3 for Figure 2 A cross-sectional view of the flow-aiding inner cylinder.

[0024] In the figure: 1 is a flow-aiding inner cylinder, 2 is a valve body, 3 is a cam, 4 is a built-in ball valve, 5 is a ball valve knob, 6 is a planetary gear, 7 is an outflow collar, 8 is a sliding sleeve, 9 is a sliding sleeve knob, and 10 is a spring. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the specific embodiments of the present invention and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] The following is combined with Figure 1-3 , describes in detail the technical solution provided by the embodiments of the present invention.

[0027] Example 1

[0028] See also Figure 1 As shown, in this embodiment, a linkage bypass valve is disclosed, which can be used as a linkage labor-saving and flow-assisting continuous valve for coalbed methane wells, and includes a flow-assisting inner tube 1, a valve body 2, a cam 3, a built-in ball valve 4, a ball valve knob 5, a planetary gear 6, an outflow collar 7, a sliding sleeve 8, a sliding sleeve knob 9, and a spring 10. Among them, the ball valve knob 5 and the cam shaft of the cam 3 are preferably connected in the form of threads, and the cam 3, the planetary gear 6 and the ball valve 4 together constitute a ball valve labor-saving system, that is, the built-in ball valve 4 can be opened by acting on the ball valve knob 5 with a small force. A circle of external gears is arranged on the camshaft on one side of the cam 3, and a circle of internal gears is arranged on the corresponding position of the ball valve 4. The number of teeth of the internal gear on the ball valve 4 is preferably twice the number of teeth of the external gear on the cam 3. There are preferably three planetary gears 6, which are respectively meshed with the internal gear on the ball valve 4 and the external gear of the cam 3. The planetary gears 6 are evenly distributed in three arrays on the same circular ring with the internal gear on the ball valve 4 as the center, and can rotate by themselves, and the center position of each gear remains relatively stationary with the ball valve 4.

[0029] Preferably, combined Figure 2-3 The ball valve knob 5 and the sliding knob 9 on the valve body are staggered at 90 degrees on the circle where the valve body is viewed from above, so as to avoid the internal liquid from causing harm to the user during operation. The outer side of the flow-aiding inner cylinder 1 is preferably connected and fixed to the valve body 2 by a threaded manner. The inner side of the flow-aiding inner cylinder 1 has a uniform array of ten petal-shaped guide grooves, which can effectively reduce the impact of the internal fluid on the ball valve itself, and can flow back in a streamlined manner, thereby promoting the increase of the flow rate of the internal fluid.

[0030] The outflow collar 7 is installed along the axial direction, with the upper end connected to the ball valve 4 and the lower end connected to the sliding sleeve 8 , and an annular protrusion is provided on the outflow collar 7 and is tangent to the cam 3 .

[0031] exist Figure 1 When the ball valve knob 5 is in the initial position, the bypass can be conducted, but the valve body cannot be conducted in the vertical direction. When the ball valve knob 5 rotates, the cam 3 rotates, and the cam 3 pushes the outflow collar 7 to move downward in the axial direction, thereby driving the sleeve 8 to move downward, causing the first perforation on the sleeve 8 to be misaligned with the second perforation on the valve body 2, forming a linkage effect, and causing the valve body to be conducted in the vertical direction, the bypass is closed, and the valve flow direction is switched. In addition, the spring 10 can provide force for the outflow collar 7 and the sleeve 8 to reset along the axis.

[0032] Example 2

[0033] This embodiment discloses a continuous circulation drilling device, which can be used in the construction of coalbed methane wells, and the above-mentioned linkage bypass valve is used as a continuous circulation valve in the main pipeline of the device.

[0034] In summary, the linked bypass valve disclosed in the embodiment of the present invention can be used for the linked labor-saving and flow-assisting continuous valve in coalbed methane wells. The valve mode is switched by a planetary gear reduction method, and the force required for switching the main valve channel and the bypass channel can be controlled; the cam is combined with the outflow ring to prevent the valve body from getting stuck after sand enters the inside, and can adapt to the use scenarios in harsh environments such as coalbed methane wells; the inner wall of the flow-assisting inner tube has ten petal-shaped guide grooves that can make the fluid move along the streamline direction when passing through, decompose part of the fluid pressure into a direction perpendicular to the original fluid direction, and balance the force in a plane perpendicular to the original fluid direction, which can reduce damage to the valve body itself and avoid the impact of strong fluid on various components in the valve body.

[0035] The above description is only an embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, expansion, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A linkage bypass valve, characterized in that: The linkage bypass valve comprises a valve body, a built-in ball valve, a ball valve knob, a cam, an outflow collar, a sliding sleeve and a spring. The built-in ball valve is arranged in the valve body, and the built-in ball valve is driven to rotate by a ball valve knob arranged on the valve body. The ball valve knob is fixedly connected to a cam shaft of a cam arranged in the valve body. The valve body also comprises an outflow collar abutting against the cam, the outflow collar abutting against the sliding sleeve, the sliding sleeve abutting against the spring, and a first perforation is arranged on the sliding sleeve, and a second perforation corresponding to the first perforation is arranged on the valve body. The camshaft is provided with an external gear at a position on one side of the cam, the ball valve is provided with an internal gear at a position corresponding to the external gear, and a planetary gear is provided between the external gear and the internal gear; The number of teeth of the internal gear is an even multiple of the number of teeth of the external gear; The number of teeth of the inner gear is twice the number of teeth of the outer gear, the planetary gears are evenly distributed in an array on a ring with the inner gear as the center, and the center position of each planetary gear remains relatively stationary with the ball valve; The second perforation is provided with a sliding sleeve knob; The sliding sleeve knob and the ball valve knob are staggered 90 degrees on the valve body; The linkage bypass valve further comprises a flow-assisting inner cylinder, which is arranged in the valve body close to the built-in ball valve and on a different side from the outflow collar, the flow-assisting inner cylinder is fixedly connected to the valve body, and a plurality of petal-shaped flow guide grooves in a uniform array are arranged on the inner side of the flow-assisting inner cylinder; The groove structure of each petal-shaped guide groove is arranged on a side away from the built-in ball valve, and the arc-shaped structure of the petal-shaped guide groove is arranged on a side close to the built-in ball valve; The outflow collar is provided with an annular protrusion, and the cam abuts against the annular protrusion.

2. A continuous circulation drilling device, characterized in that: The continuous circulation drilling equipment adopts the linkage bypass valve according to claim 1 as a continuous circulation valve.

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