Skid-mounted well killing fluid mixing and injecting device

Abstract

The utility model relates to the technical field of well killing fluid mixing injection, in particular to a skid-mounted well killing fluid mixing injection device. The skid-mounted well killing fluid mixing and injecting device comprises a stirring barrel and a liner barrel, the liner barrel is fixedly sleeved with an inclined annular flow deflector, a stirring shaft is installed on the stirring barrel, and the rod section, located on the liner barrel, of the stirring shaft is fixedly sleeved with a spiral blade. According to the skid-mounted well killing fluid mixing and injecting device, the servo motor is started to drive the spiral blade on the stirring shaft to rotate, and after the spiral blade rotates, well killing fluid in the inner container barrel generates negative pressure due to vortex, so that mixed well killing fluid below the inner container barrel is driven to be fed to the position above the inner container barrel; the rising well killing fluid overflows towards the inclined annular flow deflectors through the overflow cavity formed in the inner container cylinder and then is shunted in one direction through the multiple layers of inclined annular flow deflectors, so that the well killing fluid between the stirring cylinder and the inner container cylinder forms an internal circulation, and the mixing degree of the well killing fluid is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of kill fluid mixing and injection, in particular to a skid-mounted kill fluid mixing and injection device. Background Art

[0002] During the workover operation of a natural gas well, kill fluid is usually injected into the wellbore to ensure the requirements of safe operation. Due to problems such as different degrees of leakage into the formation and swelling of formation clay minerals in the commonly used kill fluid, the gas well is polluted to varying degrees. Especially for low-pressure gas wells, the phenomenon of kill fluid leakage into the formation is more serious. For workover operations such as kill operations on low-pressure natural gas wells, the kill fluid has characteristics such as appropriate density, no leakage, no pollution to the formation, and stable performance.

[0003] The existing kill fluid mixing and injection device generally includes a stirring device and a Venturi mixing injector. The stirring device completes the stirring of solid and liquid raw materials and transports them to the Venturi mixing injector, and the Venturi mixing injector completes the injection of the kill fluid. However, the structure of the stirring device in the current kill fluid mixing and injection device is still limited to the traditional solid-liquid mixing stirring device, and most of the stirring devices use the mixing method of stirring rods, resulting in poor mixing of some kill fluids.

[0004] Therefore, it is necessary to provide a new skid-mounted kill fluid mixing and injection device to solve the above technical problems. Summary of the Utility Model

[0005] To solve the above technical problems, the utility model provides a skid-mounted kill fluid mixing and injection device.

[0006] The skid-mounted kill fluid mixing and injection device provided by the utility model includes:

[0007] A mixing barrel, and

[0008] An inner liner barrel arranged inside the mixing barrel and coaxially with the mixing barrel. The cavity between the mixing barrel and the inner liner barrel forms an overflow cavity. A plurality of annularly distributed overflow cavities are opened at the top of the inner liner barrel. A plurality of obliquely arranged annular guide vanes are fixedly sleeved on the inner liner barrel below the overflow cavity at equal intervals up and down, and a plurality of annularly distributed liquid dropping cavities are opened on the obliquely arranged annular guide vanes.

[0009] A stirring shaft is installed on the mixing barrel, and a spiral blade is fixedly sleeved on the rod section of the stirring shaft located inside the inner liner barrel.

[0010] The bottom of the stirring shaft extends out of the inner liner barrel and is provided with a plurality of annularly distributed auxiliary components, and the kill fluid is stirred through the auxiliary components.

[0011] Preferably, the auxiliary component includes a side stirring rod, one end of the side stirring rod is fixedly connected to the side wall of the stirring shaft near the bottom, and a steel ball with elastic connection is arranged at the other end of the side stirring rod.

[0012] Preferably, a spring is fixedly installed on the side stirring rod, and the other end of the spring is fixedly connected to the steel ball.

[0013] Preferably, the radius of the inclined annular guide vane on the inner liner cylinder increases from top to bottom.

[0014] Preferably, the mixing cylinder is fixedly installed with a servo motor through a frame, and the output end of the servo motor is fixedly connected to the stirring shaft.

[0015] Preferably, an injection pipe is fixedly installed on the upper surface of the mixing cylinder, and a Venturi mixing injector is fixedly installed on the drain pipe installed on the side wall of the mixing cylinder near the bottom.

[0016] Preferably, the mixing cylinder is fixedly mounted on an I-beam chassis.

[0017] Compared with the related technology, the skid-mounted kill fluid mixing and injection device provided by the present utility model has the following beneficial effects:

[0018] 1. The present utility model starts the servo motor to drive the spiral blades on the stirring shaft to rotate. After the spiral blades rotate, the kill fluid in the inner liner cylinder generates negative pressure due to vortex, thereby driving the mixed kill fluid below the inner liner cylinder to feed upward into the inner liner cylinder. The rising kill fluid overflows to the inclined annular guide vane through the overflow cavity opened on the inner liner cylinder, and then is divided by multiple layers of inclined annular guide vanes one by one. Therefore, the kill fluid between the mixing cylinder and the inner liner cylinder forms an internal circulation, further improving the mixing degree of the kill fluid.

[0019] 2. With the high-speed rotation of the stirring shaft in the present utility model, the steel ball stretches the spring under the action of centrifugal force. Therefore, the length of the stirring structure composed of the side stirring rod, the spring and the steel ball is effectively adjusted, thereby increasing the stirring area, and expanding the one-way coupling area between the stirring shaft and the solid-liquid raw materials in the mixing cylinder during rotation. Compared with the traditional vertically arranged stirring rod, the stirring efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural diagram of a preferred embodiment of the skid-mounted kill fluid mixing and injection device provided by the present utility model;

[0021] Figure 2 is Figure 1 the cross-sectional structural diagram of the mixing cylinder shown;

[0022] Figure 3 is Figure 2Schematic structural diagram of the auxiliary component shown

[0023] Figure 4 is Figure 1 Schematic structural diagram of the I-beam chassis shown

[0024] Reference numerals in the figure: 1, mixing drum; 11, injection pipe; 2, inner liner; 1-2, overflow chamber; 2a, external overflow chamber; 21, inclined annular guide vane; 21a, liquid falling chamber; 3, servo motor; 4, mixing shaft; 5, spiral blade; 6, auxiliary component; 61, side stirring rod; 62, spring; 63, steel ball; 7, Venturi mixing injector; 8, I-beam chassis Specific implementation mode

[0025] In order to make the purpose, technical solution and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model

[0026] The following describes the specific implementation of the present utility model in detail with reference to specific embodiments

[0027] Please refer to Figures 1 to 4 , a skid-mounted kill fluid mixing and injection device provided by an embodiment of the present utility model, the skid-mounted kill fluid mixing and injection device includes a mixing drum 1, an inner liner 2, a spiral blade 5 and an auxiliary component 6

[0028] In an embodiment of the present utility model, please refer to Figures 1 to 4 , an inner liner 2 coaxially arranged with the mixing drum 1 is installed in the mixing drum 1, and the cavity between the mixing drum 1 and the inner liner 2 forms an overflow chamber 1-2. A plurality of annularly distributed external overflow chambers 2a are opened near the top of the inner liner 2, and a plurality of equally spaced inclined annular guide vanes 21 are fixedly sleeved on the inner liner 2 below the external overflow chamber 2a. A plurality of annularly distributed liquid falling chambers 21a are opened on the inclined annular guide vane 21, and the radius of the inclined annular guide vane 21 on the inner liner 2 increases from top to bottom. A mixing shaft 4 is installed on the mixing drum 1, and a spiral blade 5 is fixedly sleeved on the rod section of the mixing shaft 4 located in the inner liner 2. The mixing drum 1 is fixedly installed with a servo motor 3 through a frame, and the output end of the servo motor 3 is fixedly connected to the mixing shaft 4

[0029] It should be noted that: The servo motor 3 is started to drive the spiral blade 5 on the stirring shaft 4 to rotate. After the spiral blade 5 rotates, the kill fluid in the inner liner cylinder 2 generates negative pressure due to vortex, thereby driving the mixed kill fluid below the inner liner cylinder 2 to feed upward into the inner liner cylinder 2. The rising kill fluid overflows to the inclined annular guide vane 21 through the overflow cavity 2a opened in the inner liner cylinder 2 and is further divided by the multi-layer inclined annular guide vanes 21 one by one. Therefore, the kill fluid between the mixing cylinder 1 and the inner liner cylinder 2 forms an internal circulation, further improving the mixing degree of the kill fluid;

[0030] Among them, the mixing cylinder 1 is fixedly installed on the I-beam chassis 8, thereby forming an integral unit with the mixing cylinder 1, which is convenient for installation, migration and use.

[0031] In the embodiment of the present utility model, please refer to Figures 1 to 4 , the bottom of the stirring shaft 4 extends out of the inner liner cylinder 2 and is provided with a number of annularly distributed auxiliary components 6. The kill fluid is stirred by the auxiliary components 6. The auxiliary components 6 include side stirring rods 61. One end of the side stirring rod 61 is fixedly connected to the side wall of the stirring shaft 4 near the bottom, and the other end of the side stirring rod 61 is provided with a steel ball 63 connected elastically. Specifically, a spring 62 is fixedly installed on the side stirring rod 61, and the other end of the spring 62 is fixedly connected to the steel ball 63.

[0032] It should be noted that: The servo motor 3 is started to drive the stirring shaft 4 to rotate. As the stirring shaft 4 rotates at a high speed, the steel ball 63 stretches the spring 62 under the action of centrifugal force. Therefore, the length of the stirring structure composed of the side stirring rod 61, the spring 62 and the steel ball 63 is effectively adjusted, thereby increasing the stirring area and expanding the one-way coupling area between the stirring shaft 4 and the solid-liquid raw materials in the mixing cylinder 1 during the rotation process. Compared with the traditional vertically arranged stirring rods, the stirring efficiency is improved.

[0033] In the embodiment of the present utility model, please refer to Figures 1 to 4 , an injection pipe 1 is fixedly installed on the upper surface of the mixing cylinder 1, and a Venturi mixing injector 7 is fixedly installed on the drain pipe installed on the side wall of the mixing cylinder 1 near the bottom. After the kill fluid in the mixing cylinder 1 is stirred, it is injected into the wellbore through the Venturi mixing injector 7.

[0034] The working principle of the skid-mounted kill fluid mixing and injection device provided by the present utility model is as follows:

[0035] Start the servo motor 3 to drive the spiral blade 5 on the stirring shaft 4 to rotate. After the spiral blade 5 rotates, the kill fluid in the inner cylinder 2 generates negative pressure due to vortex, thus driving the mixed kill fluid below the inner cylinder 2 to feed upward into the inner cylinder 2. The rising kill fluid overflows to the inclined annular deflector 21 through the overflow cavity 2a opened in the inner cylinder 2 and is further divided by the multi-layer inclined annular deflector 21 one by one. Therefore, the kill fluid between the mixing cylinder 1 and the inner cylinder 2 forms an internal circulation, further improving the mixing degree of the kill fluid. As the stirring shaft 4 rotates at a high speed, the steel ball 63 stretches the spring 62 under the action of centrifugal force. Therefore, the length of the stirring structure composed of the side stirring rod 61, the spring 62 and the steel ball 63 is effectively adjusted, thereby increasing the stirring area and expanding the one-way coupling area between the stirring shaft 4 and the solid-liquid raw materials in the mixing cylinder 1 during rotation. Compared with the traditional vertically arranged stirring rod, the stirring efficiency is improved. After the kill fluid in the mixing cylinder 1 is stirred, it is injected into the wellbore through the Venturi mixing injector 7.

[0036] The circuits and controls involved in the present utility model are all prior arts and will not be elaborated here too much.

[0037] The above are only the embodiments of the present utility model, and thus do not limit the patent scope of the present utility model. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present utility model, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present utility model.

Claims

1. A skid-mounted well-killing fluid mixing and injection device, characterized in that: include: a mixing drum (1), and An inner liner tube (2) is arranged in the mixing drum (1) and coaxially with the mixing drum (1), and the chamber between the mixing drum (1) and the inner liner tube (2) constitutes an overflow chamber (1-2), the inner liner tube (2) is provided with a plurality of annularly distributed external overflow chambers (2a) near the top, and a plurality of oblique annular guide plates (21) equidistantly distributed up and down are fixedly sleeved on the inner liner tube (2) below the external overflow chambers (2a), and a plurality of annularly distributed liquid falling chambers (21a) are provided on the oblique annular guide plates (21); The mixing drum (1) is provided with a mixing shaft (4), and the mixing shaft (4) is located on the rod section of the inner drum (2) and is fixedly sleeved with a spiral blade (5); An inner tube (2) extends from the bottom of the stirring shaft (4) and is provided with a plurality of annularly distributed auxiliary components (6), through which the well-killing fluid is stirred.

2. The skid-mounted well-killing fluid mixing and injection device according to claim 1, characterized in that: The auxiliary component (6) comprises a side stirring rod (61), one end of which is fixedly connected to the side wall of the stirring shaft (4) near the bottom, and the other end of which is provided with an elastically connected steel ball (63).

3. The skid-mounted well-killing fluid mixing and injection device according to claim 2 is characterized in that: A spring (62) is fixedly mounted on the side stirring rod (61), and the other end of the spring (62) is fixedly connected to a steel ball (63).

4. The skid-mounted well-killing fluid mixing and injection device according to claim 1, characterized in that: The radius of the obliquely placed annular guide vane (21) on the inner tube (2) increases from top to bottom.

5. The skid-mounted well-killing fluid mixing and injection device according to claim 1, characterized in that: The mixing drum (1) is fixedly mounted with a servo motor (3) via a frame, and the output end of the servo motor (3) is fixedly connected to a mixing shaft (4).

6. The skid-mounted well-killing fluid mixing and injection device according to claim 1, characterized in that: An injection pipe (11) is fixedly mounted on the upper surface of the mixing drum (1), and a Venturi mixing ejector (7) is fixedly mounted on a liquid discharge pipe mounted on a side wall of the mixing drum (1) close to the bottom.

7. The skid-mounted well-killing fluid mixing and injection device according to claim 1, characterized in that: The mixing drum (1) is fixedly mounted on an I-beam chassis (8).

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