Speed-limited jet well-washing device

Abstract

The present invention discloses a speed-limited jet well-washing device, which relates to the technical field of drilling equipment and comprises: a central tube; a rotary jet cleaning mechanism rotatably arranged on the central tube; a speed-limiting mechanism arranged on the central tube and located at the upper end of the rotary jet cleaning mechanism; wherein the speed-limiting mechanism comprises a speed-limiting sleeve and at least one speed-limiting ball, the speed-limiting sleeve being detachably mounted on the central tube, the speed-limiting ball being movably arranged between the speed-limiting sleeve and the rotary jet cleaning mechanism, and being capable of rotating synchronously with the rotary jet cleaning mechanism, and when the speed-limiting ball contacts the speed-limiting sleeve, the friction between the speed-limiting ball and the speed-limiting sleeve limits the rotational speed of the rotary jet cleaning mechanism. The speed-limited jet well-washing device provided by the present invention can automatically limit the rotational speed of a rotary spray gun.

Description

Technical Field

[0001] The present invention relates to the technical field of drilling equipment, in particular to a speed-limited jet well-washing device. Background Art

[0002] As oilfield development enters the middle and late stages, problems such as well blockage and scaling become increasingly common. Tubing wall blockage can cause additional pressure drop, impacting well production. Furthermore, long-term water injection near the wellbore often leads to sand production, which can block oil and gas pathways, reduce permeability, and, in severe cases, even cause production to cease.

[0003] In recent years, high-pressure rotary jet declogging technology has been frequently used to clean scale from tubing strings and remove blockages near the wellbore. This technique utilizes high-pressure water jet theory and rotary control technology to generate a high-pressure water jet action and annular swirl effect within the blocked formation and tubing. Therefore, the rotational speed of the rotary jet has a significant impact on declogging. However, excessively high spray gun rotation speed can easily produce atomization, significantly reducing the impact of the jet, leading to poor declogging and reduced cleaning effectiveness. Furthermore, excessively slow spray gun rotation speed reduces tubing circumference coverage, significantly reducing the efficiency of high-pressure rotary jet declogging and descaling. Limited by the spray gun's structure, there is currently no established method for limiting rotational speed.

[0004] In the prior art, a speed-limiting element is typically added to the rear end of the rotating jet device to reduce its rotational speed. However, while adding too many speed-limiting element blades reduces the impact of atomization, it also slows the lance's rotational speed, reducing scale removal efficiency. Furthermore, reducing the number of speed-limiting element blades makes it difficult to effectively control the lance's rotational speed, resulting in a continuous increase in the rotating jet device's rotational speed. This speed is often too high and difficult to control, resulting in severe atomization and making it difficult to effectively clean tubing scale.

[0005] In order to overcome the difficulties in high-pressure rotary jet unblocking, the inventors proposed a speed-limited jet well flushing device of the present invention based on many years of practice in oil and gas well production enhancement and the experience in the development of rotary jet tools. Summary of the Invention

[0006] The purpose of the present invention is to provide a speed-limiting jet well-washing device which can automatically limit the rotation speed of a rotating spray gun.

[0007] The above-mentioned purpose of the present invention can be achieved by adopting the following technical solutions:

[0008] The present invention provides a speed-limited jet well-washing device, comprising:

[0009] Central tube;

[0010] A rotary jet cleaning mechanism is rotatably disposed on the central tube;

[0011] a speed limiting mechanism, provided on the central tube and located at the upper end of the rotary jet cleaning mechanism;

[0012] In which, the speed limiting mechanism includes a speed limiting sleeve and at least one speed limiting ball. The speed limiting sleeve is detachably mounted on the center tube. The speed limiting ball is movably arranged between the speed limiting sleeve and the rotating jet cleaning mechanism, and can rotate synchronously with the rotating jet cleaning mechanism. When the speed limiting ball contacts the speed limiting sleeve, the friction between the speed limiting ball and the speed limiting sleeve limits the rotation speed of the rotating jet cleaning mechanism.

[0013] In a preferred embodiment, the rotary jet cleaning mechanism includes a spray gun, which is rotatably mounted on the central tube, and at least one limiting hole is formed on the upper end surface of the spray gun;

[0014] The speed limiting mechanism includes at least one limiting member, which is arranged in the limiting hole and elastically connected to the bottom surface of the limiting hole through a spring. A limiting groove is formed on the upper end surface of the limiting member, and the speed limiting ball can be slidably arranged in the limiting groove so that the spray gun can drive the speed limiting ball to rotate synchronously through the limiting hole and the limiting member.

[0015] In a preferred embodiment, there are multiple limiting holes, and the multiple limiting holes are evenly distributed along the circumferential direction on the upper end surface of the spray gun;

[0016] There are multiple limiting members, and the multiple limiting members are correspondingly arranged in the multiple limiting holes;

[0017] There are multiple speed limiting balls, and the multiple speed limiting balls are correspondingly arranged in the limiting grooves on the multiple limiting members.

[0018] In a preferred embodiment, the inner wall surface of the speed limiting sleeve is radially tapered from bottom to top, and the speed limiting ball can have pressure between it and the inner wall surface of the speed limiting sleeve under the action of rotational centrifugal force. The pressure generates friction between the speed limiting ball and the speed limiting sleeve to limit the rotation speed of the spray gun. At least part of the component of the pressure is used to elastically compress the limiting member into the limiting hole, so that the speed limiting ball moves radially outward along the limiting groove.

[0019] In a preferred embodiment, the speed limiting sleeve is divided into at least a first speed limiting sleeve and a second speed limiting sleeve according to the structure of its inner wall surface, and the first speed limiting sleeve and the second speed limiting sleeve are sleeved on the central pipe in a time-sharing manner.

[0020] In a preferred embodiment, the angle between the inner wall surface of the first speed limiting sleeve and the axis of the first speed limiting sleeve is greater than the angle between the inner wall surface of the second speed limiting sleeve and the axis of the second speed limiting sleeve.

[0021] In a preferred embodiment, the angle between the inner wall surface of the speed limiting sleeve and the axis of the speed limiting sleeve is gradually increased or decreased from bottom to top.

[0022] In a preferred embodiment, the speed limiting sleeve is connected to the central tube via a thread, and the speed limiting sleeve can adjust its own height via the thread to control the contact position between the speed limiting ball and the inner wall of the speed limiting sleeve.

[0023] In a preferred embodiment, the speed limiting mechanism also includes a stop nut, which is threadedly connected to the center tube and abuts against the upper end surface of the speed limiting sleeve. The stop nut is used to prevent the speed limiting sleeve from being rubbed out of the center tube by the speed limiting ball.

[0024] In a preferred embodiment, the central tube is formed with a fluid outlet on its side wall;

[0025] A liquid storage cavity is formed inside the spray gun at the fluid outlet, and a plurality of nozzles are formed on the spray gun extending from the inner wall to the outer wall thereof, and the plurality of nozzles are evenly distributed along the circumference of the spray gun;

[0026] The nozzle is connected to the liquid storage chamber, and the axis of the nozzle is eccentrically arranged with respect to the axis of the central tube. The cleaning water is sprayed out of the spray gun through the central tube, the fluid outlet, the liquid storage chamber, and the plurality of nozzles, and generates a reverse thrust torque to drive the spray gun to rotate.

[0027] The characteristics and advantages of the present invention are:

[0028] The speed-limited jet well-washing device provided by the present invention can deliver cleaning water into the well through a central tube and a rotating jet cleaning mechanism rotatably mounted on the central tube. When the cleaning water leaves the rotating jet cleaning mechanism, it generates a reverse thrust, which drives the rotating jet cleaning mechanism to rotate, thereby cleaning various locations within the well. Simultaneously, as the rotating jet cleaning mechanism rotates, the speed-limiting ball within the speed-limiting mechanism rotates synchronously with the rotating jet cleaning mechanism, generating friction between the fixed speed-limiting sleeve, thereby limiting the rotational speed of the rotating jet cleaning mechanism and preventing the rotating jet cleaning mechanism from rotating too quickly and affecting the quality of the well-washing. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0030] Figure 1 Shown is a schematic diagram of the overall structure of the speed-limited jet well-washing device of the present invention.

[0031] Figure 2 The figure shows a cross-sectional view of the speed limiting mechanism of the speed limiting jet well washing device of the present invention ( Figure 1 AA) Schematic top view.

[0032] Figure 3 FIG. 1 is a schematic structural diagram of a first embodiment of a speed-limiting sleeve of a speed-limiting jet well-flushing device according to the present invention.

[0033] Figure 4 FIG2 is a schematic structural diagram of a second embodiment of a speed-limiting sleeve of a speed-limiting jet well-flushing device according to the present invention.

[0034] Figure 5 FIG. 1 is a schematic structural diagram of a third embodiment of the speed-limiting sleeve of the speed-limiting jet well-flushing device of the present invention.

[0035] Figure 6 FIG. 1 is a schematic structural diagram of a fourth embodiment of a speed-limiting sleeve of a speed-limiting jet well-flushing device according to the present invention.

[0036] Figure 7 The figure shows a cross-sectional view of the rotary jet cleaning mechanism of the speed-limited jet well-cleaning device of the present invention ( Figure 1 BB) Schematic diagram from above. DETAILED DESCRIPTION

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without inventive effort are within the scope of protection of the present invention. It should be noted that when an element is referred to as being "disposed on" another element, it can be directly on the other element or there can be an intermediate element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there can be an intermediate element. The terms "mounted," "connected," and "connected" should be understood broadly. For example, they can refer to mechanical or electrical connections, internal communication between two elements, direct connection, or indirect connection through an intermediary. Those of ordinary skill in the art will understand the specific meanings of these terms based on the specific circumstances. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0038] See also Figure 1 As shown, an embodiment of the present invention provides a speed-limited jet well washing device, comprising: a central pipe 1; a rotating jet cleaning mechanism 2, which is rotatably arranged on the central pipe 1; a speed limiting mechanism 3, which is arranged on the central pipe 1 and is located at the upper end of the rotating jet cleaning mechanism 2; wherein, the speed limiting mechanism 3 includes a speed limiting sleeve 31 and at least one speed limiting ball 32, the speed limiting sleeve 31 is detachably mounted on the central pipe 1, and the speed limiting ball 32 is movably arranged between the speed limiting sleeve 31 and the rotating jet cleaning mechanism 2, and can rotate synchronously with the rotating jet cleaning mechanism 2. When the speed limiting ball 32 contacts the speed limiting sleeve 31, the friction between the speed limiting ball 32 and the speed limiting sleeve 31 limits the rotation speed of the rotating jet cleaning mechanism 2.

[0039] The specific structure and connection relationship of the speed-limited jet well flushing device according to the embodiment of the present invention are further described below:

[0040] Please also refer to Figure 2 As shown, in a preferred embodiment, the rotating jet cleaning mechanism 2 includes a spray gun 21, which is rotatably mounted on the central tube 1, and at least one limiting hole 22 is formed on the upper end surface of the spray gun 21; the speed limiting mechanism 3 includes at least one limiting member 33, which is arranged in the limiting hole 22 and is elastically connected to the bottom surface of the limiting hole 22 through a spring 34, and a limiting groove 331 is formed on the upper end surface of the limiting member 33, and the speed limiting ball 32 can be slidably arranged in the limiting groove 331, so that the spray gun 21 can drive the speed limiting ball 32 to rotate synchronously through the limiting hole 22 and the limiting member 33.

[0041] In a preferred embodiment, there are multiple limiting holes 22, and the multiple limiting holes 22 are evenly distributed along the circumferential direction on the upper end surface of the spray gun 21; there are multiple limiting members 33, and the multiple limiting members 33 are correspondingly arranged in the multiple limiting holes 22; there are multiple speed limiting balls 32, and the multiple speed limiting balls 32 are correspondingly arranged in the limiting grooves 331 on the multiple limiting members 33.

[0042] In a preferred embodiment, the inner wall surface of the speed limiting sleeve 31 is radially tapered from bottom to top, and the speed limiting ball 32 can generate pressure between the inner wall surface of the speed limiting sleeve 31 under the action of rotational centrifugal force. The pressure generates friction between the speed limiting ball 32 and the speed limiting sleeve 31 to limit the rotation speed of the spray gun 21. At least part of the component of the pressure is used to elastically compress the limiting member 33 into the limiting hole 22, so that the speed limiting ball 32 moves radially outward along the limiting groove 331.

[0043] Please also refer to Figure 3 and Figure 4 As shown, in a preferred embodiment, the speed limiting sleeve 31 is divided into at least a first speed limiting sleeve 31a and a second speed limiting sleeve 31b according to the structure of its inner wall surface. The first speed limiting sleeve 31a and the second speed limiting sleeve 31b are sleeved on the central pipe 1 in a time-sharing manner.

[0044] In a preferred embodiment, the angle between the inner wall surface of the first speed limiting sleeve 31a and the axis of the first speed limiting sleeve 31a is greater than the angle between the inner wall surface of the second speed limiting sleeve 31b and the axis of the second speed limiting sleeve 31b.

[0045] In a preferred embodiment, the angle between the inner wall of the speed limiting sleeve 31 and the axis of the speed limiting sleeve 31 is gradually increased or decreased from bottom to top. Figure 5 and Figure 6 As shown, in a feasible embodiment, the specific structure may be set as the speed limiting sleeve 31c or the speed limiting sleeve 31d in the figure, but is not limited thereto.

[0046] In a preferred embodiment, the speed limiting sleeve 31 is connected to the central tube 1 via threads, and the speed limiting sleeve 31 can adjust its own height via the threads to control the contact position between the speed limiting ball 32 and the inner wall of the speed limiting sleeve 31 .

[0047] See also Figure 5 As shown, in a preferred embodiment, the speed limiting mechanism 3 also includes a stop nut 35, which is threadedly connected to the center tube 1 and abuts against the upper end surface of the speed limiting sleeve 31. The stop nut 35 is used to prevent the speed limiting sleeve 31 from being rubbed by the speed limiting ball 32 and being screwed out of the center tube 1.

[0048] Please also refer to Figure 7As shown, in a preferred embodiment, the central tube 1 is formed with a fluid outlet 11 on its side wall; a liquid storage chamber 23 is formed inside the spray gun 21 at the fluid outlet 11, and a plurality of nozzles 24 extending from the inner wall to the outer wall are formed on the spray gun 21, and the plurality of nozzles 24 are evenly distributed along the circumference of the spray gun 21; the nozzles 24 are connected to the liquid storage chamber 23, and the axis of the nozzle 24 is eccentrically arranged with respect to the axis of the central tube 1, and the cleaning water is sprayed out of the spray gun 21 through the central tube 1, the fluid outlet 11, the liquid storage chamber 23, and the plurality of nozzles 24, and a reverse thrust torque is generated to drive the spray gun 21 to rotate.

[0049] Based on the above method description, the speed-limited jet well flushing device of the embodiment of the present invention has the following beneficial effects:

[0050] 1. The speed-limited jet well-washing device provided in an embodiment of the present invention can deliver cleaning water into the well through a central pipe 1 and a rotating jet cleaning mechanism 2 rotatably mounted on the central pipe 1. When the cleaning water leaves the rotating jet cleaning mechanism 2, it generates a reverse thrust, which drives the rotating jet cleaning mechanism 2 to rotate, thereby cleaning various locations within the well. Simultaneously, as the rotating jet cleaning mechanism 2 rotates, the speed-limiting ball 32 within the speed-limiting mechanism 3 rotates synchronously with the rotating jet cleaning mechanism 2, generating friction between the fixed speed-limiting sleeve 31, thereby limiting the rotational speed of the rotating jet cleaning mechanism 2 and preventing the rotating jet cleaning mechanism 2 from rotating too quickly and affecting the quality of the well-washing.

[0051] 2. The speed-limited jet well-flushing device provided in this embodiment of the present invention features a limiter 33 within the speed-limiting mechanism 3. This limiter 33 is elastically connected to the spray gun 21 via a spring 34. When the spray gun 21 rotates, the speed-limiting ball 32 pushes the limiter 33 downward, shifting the contact point between the speed-limiting ball 32 and the speed-limiting sleeve 31 radially outward, further increasing the speed-limiting torque generated by friction. When the spray gun 21 stops rotating, the limiter 33 uses its elastic force to push the speed-limiting ball 32 back into position, preventing it from becoming stuck.

[0052] 3. The speed-limiting jet well-washing device provided in an embodiment of the present invention is provided with multiple speed-limiting sleeves 31, and different speed-limiting sleeves 31 have different angles between their inner wall surfaces and their axes. When the speed-limiting mechanism 3 uses different speed-limiting sleeves 31, the direction of the pressure generated when the speed-limiting ball 32 contacts the speed-limiting sleeve 31 also differs, thereby generating different speed-limiting friction forces by replacing the speed-limiting sleeve 31. Generally, the greater the angle between the inner wall surface of the speed-limiting sleeve 31 and its axis, the greater the speed-limiting friction force between the speed-limiting ball 32 and the speed-limiting sleeve 31.

[0053] 4. The speed-limiting jet well-washing device provided in an embodiment of the present invention can configure the inner wall surface of a single speed-limiting sleeve 31 to be curved. By controlling the depth of the spiral insertion of the speed-limiting sleeve 31 on the center pipe 1, the angle between the inner wall surface and the axis of the speed-limiting ball 32 at the contact point with the speed-limiting sleeve 31 is varied, thereby varying the direction of the pressure generated when the speed-limiting ball 32 and the speed-limiting sleeve 31 contact each other. Thus, different speed-limiting friction forces can be generated by controlling the position of the speed-limiting sleeve 31. Generally, for example, when the angle between the inner wall surface and the axis of the speed-limiting sleeve 31 is configured to gradually decrease from bottom to top, the higher the position of the speed-limiting sleeve 31 on the center pipe 1, the radially outward contact point of the speed-limiting ball 32 and the speed-limiting sleeve 31, and the greater the speed-limiting friction force between the speed-limiting ball 32 and the speed-limiting sleeve 31, and vice versa.

[0054] The above are merely embodiments of the present invention. Those skilled in the art may make various changes or modifications to the embodiments of the present invention based on the contents disclosed in the application documents without departing from the spirit and scope of the present invention. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more related listed items.

Claims

1. A speed-limited jet well-washing device, characterized in that: include: Central tube; A rotary jet cleaning mechanism is rotatably disposed on the central tube, the rotary jet cleaning mechanism comprising a spray gun, the spray gun being rotatably sleeved on the central tube, and at least one limiting hole being formed on the upper end surface of the spray gun; a speed limiting mechanism, provided on the central tube and located at the upper end of the rotary jet cleaning mechanism; Wherein, the speed limiting mechanism includes a speed limiting sleeve and at least one speed limiting ball, the speed limiting sleeve is detachably mounted on the central tube, the speed limiting ball is movably arranged between the speed limiting sleeve and the rotating jet cleaning mechanism, and can rotate synchronously with the rotating jet cleaning mechanism, and when the speed limiting ball contacts the speed limiting sleeve, the friction between the speed limiting ball and the speed limiting sleeve limits the rotation speed of the rotating jet cleaning mechanism; the speed limiting mechanism includes at least one limiting member, the limiting member is arranged in the limiting hole, and is elastically connected to the bottom surface of the limiting hole by a spring, and the limiting member A limiting groove is formed on the upper end surface, and the speed-limiting ball can be slidably arranged in the limiting groove, so that the spray gun can drive the speed-limiting ball to rotate synchronously through the limiting hole and the limiting member; the inner wall surface of the speed-limiting sleeve is radially tapered from bottom to top, and the speed-limiting ball can have pressure between it and the inner wall surface of the speed-limiting sleeve under the centrifugal action of rotation, and the pressure generates friction between the speed-limiting ball and the speed-limiting sleeve to limit the rotation speed of the spray gun, and at least part of the component of the pressure is used to elastically compress the limiting member into the limiting hole, so that the speed-limiting ball moves radially outward along the limiting groove.

2. The speed-limited jet well-washing device according to claim 1, characterized in that: There are multiple limiting holes, and the multiple limiting holes are evenly distributed along the circumferential direction on the upper end surface of the spray gun; There are multiple limiting members, and the multiple limiting members are correspondingly arranged in the multiple limiting holes; There are multiple speed limiting balls, and the multiple speed limiting balls are correspondingly arranged in the limiting grooves on the multiple limiting members.

3. The speed-limited jet well-washing device according to claim 1, characterized in that: The speed limiting sleeve is divided into at least a first speed limiting sleeve and a second speed limiting sleeve according to the structure of the inner wall surface thereof. The first speed limiting sleeve and the second speed limiting sleeve are not simultaneously sleeved on the central pipe.

4. The speed-limited jet well-washing device according to claim 3, characterized in that: An included angle between an inner wall surface of the first speed limiting sleeve and the axis of the first speed limiting sleeve is greater than an included angle between an inner wall surface of the second speed limiting sleeve and the axis of the second speed limiting sleeve.

5. The speed-limited jet well-washing device according to claim 1, characterized in that: The angle between the inner wall surface of the speed limiting sleeve and the axis of the speed limiting sleeve is gradually increased or decreased from bottom to top.

6. The speed-limited jet well-washing device according to claim 5, characterized in that: The speed limiting sleeve is connected to the central tube via a thread, and the speed limiting sleeve can adjust its height via the thread to control the contact position between the speed limiting ball and the inner wall surface of the speed limiting sleeve.

7. The speed-limited jet well-washing device according to claim 6, characterized in that: The speed limiting mechanism also includes a stop nut, which is threadedly connected to the center tube and abuts against the upper end surface of the speed limiting sleeve. The stop nut is used to prevent the speed limiting sleeve from being rubbed by the speed limiting ball and screwed out of the center tube.

8. The speed-limited jet well-washing device according to claim 1, characterized in that: The central tube is formed with a fluid outlet on its side wall; A liquid storage cavity is formed inside the spray gun at the fluid outlet, and a plurality of nozzles are formed on the spray gun extending from the inner wall to the outer wall thereof, and the plurality of nozzles are evenly distributed along the circumference of the spray gun; The nozzle is connected to the liquid storage chamber, and the axis of the nozzle is eccentrically arranged with respect to the axis of the central tube. The cleaning water is sprayed out of the spray gun through the central tube, the fluid outlet, the liquid storage chamber, and the plurality of nozzles, and generates a reverse thrust torque to drive the spray gun to rotate.

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