A pump-down scale storage device

Abstract

A pump-down scale storage device, which comprises an upper joint, an upper joint frame, a first suction pipe, a second suction pipe, a third suction pipe, a fourth suction pipe, an outer connecting pipe, a lower joint frame, a locking ring, a cyclone joint and a lower joint; the upper joint and the lower joint are connected to the upper and lower ends of the outer connecting pipe; the upper joint frame, the first suction pipe, the second suction pipe, the third suction pipe, the fourth suction pipe, the outer connecting pipe, the lower joint frame, the locking ring and the cyclone joint are arranged inside the upper joint, the outer connecting pipe and the lower joint. The pump-down scale storage device has the advantages of simple structure, convenient operation, easy operation into the wellbore with the oil pump, no additional manual maintenance operation in daily operation, effective solution to the actual problem of pump barrel and rod pipe scaling, guarantee of long-period and low-cost production and easy popularization.

Description

Technical Field

[0001] The invention belongs to the technical field of oil production equipment, and in particular relates to an under-pump scale storage device. Background Art

[0002] Scale buildup within oil well lift strings can lead to adverse effects such as pump sticking and leakage, directly impacting pump efficiency and even well operations, reducing production time and increasing costs. This phenomenon is particularly pronounced in polymer flooding and ternary composite flooding. Rapid progress has been made in scale prevention research both domestically and internationally, employing both chemical and physical mechanisms. Chemical scale prevention primarily involves preventing the crystallization and precipitation of inorganic salts in solutions and on fluid channel walls. This approach primarily involves the addition of chemical antiscalants, but is associated with high maintenance and labor costs, and is inconsistent with green mine development. Physical scale prevention, on the other hand, prevents inorganic salts from depositing on system walls, allowing them to nucleate and even crystallize in solution. However, these crystals must remain suspended in solution and not adhere to the system walls. These methods primarily utilize heavy metals and ultrasonic treatments, resulting in high costs and limited scale adoption. Therefore, developing low-cost, pollution-free, and long-lasting scale prevention methods for wells prone to scaling is a challenge.

[0003] Chinese Patent Application No. 201210291211.6 discloses an "automatic scale removal and anti-sticking oil well pump." This design employs scrapers at the upper and lower ends of the oil well pump. During the upstroke and downstroke, scraped scale and impurities fall into upper and lower scale storage chambers, preventing them from entering the pump barrel and causing the pump to stick, achieving the desired effect. However, this automatic scale removal and anti-sticking oil well pump involves structural modification of the oil well pump, without considering the adaptability limitations of the modified pump. The resulting pump barrel process is complex and expensive, making it unsuitable for complex wellbores, such as those deep and inclined.

[0004] Chinese patent application No. 201710139811.3 discloses a "step-type high-power ultrasonic pulse anti-scaling and storage device and control scheme." This device utilizes a control scheme where one triggering main circuit corresponds to a set of transducer coils, enhancing the ultrasonic pulse vibration effect. Two thyristor main circuits, each connected in a different manner, are alternately triggered, causing the two sets of transducer coils to operate alternately. Furthermore, the device utilizes a step-by-step control scheme, resulting in continuous ultrasonic waves for anti-scaling and descaling equipment. This prevents the dynamic membrane formed by ultrasonic waves on pipes and panels from being damaged by pauses in the ultrasonic waves. This device, which utilizes the principle of ultrasonic pulse vibration, suffers from high investment and complex on-site operation, making it unsuitable for low-cost production.

[0005] Chinese patent application publication No. 116181286 discloses an "annular sheet-type anti-scaling alloy tool for downhole pumping tools." This tool utilizes the alloy anti-scaling principle. The inlet and outlet external pipes at each end of the scale preventer are threaded to connect the anti-scaling device to the pipeline. The anti-scaling alloy sheet assembly consists of several annular anti-scaling alloy sheets, through which downhole pumping tools such as sucker rods and pumps can pass freely. This reduces the collision and binding of calcium and magnesium ions with carbonate ions in water, and alters the structure of scale crystals, making them more easily carried away by the water flow, thereby achieving excellent anti-scaling effects. However, this method suffers from high costs and complex on-site operations, making it unsuitable for low-cost production. Summary of the Invention

[0006] In order to solve the above problems, an object of the present invention is to provide an under-pump scale storage device.

[0007] In order to achieve the above-mentioned purpose, the pump scale storage device provided by the present invention includes an upper coupling, an upper coupling frame, a first adsorption tube, a second adsorption tube, a third adsorption tube, a fourth adsorption tube, an external connecting tube, a lower coupling frame, a locking ring, a swirl joint and a lower joint; wherein, the outer surfaces of the upper and lower ends of the external connecting tube are both formed with external threads; the upper coupling is composed of a small-diameter tube located at the upper part and an expanded-diameter tube located at the lower part, wherein the inner surface of the small-diameter tube is formed with an internal thread for connecting to the lower inlet of the oil pump, and the inner surface of the expanded-diameter tube is formed with an internal thread for matching with the external thread of the upper end of the external connecting tube; the lower joint is composed of an expanded-diameter tube located at the upper part and a small-diameter tube located at the lower part, wherein the upper part of the inner surface of the expanded-diameter tube is formed with an internal thread for matching with the external thread of the lower end of the external connecting tube, and the lower part of the inner surface is provided with an internal thread matching with the external thread on the outer circumferential surface of the locking ring, and the lower end of the inner surface protrudes inward to form a first-step The small-diameter tube on the lower joint is used to connect the tail pipe or the dirt suction and storage device; the upper hoop frame is a horizontally arranged cross, the outer ends of the four arms are fixed to the inner upper part of the outer connecting pipe, and the bottom surface of each arm is recessed upward to form a radial deep groove; the lower hoop frame is also a horizontally arranged cross, the outer ends of the four arms are fixed to the middle part of the inner surface of the enlarged diameter tube on the lower joint, and the top surface of each arm is recessed downward to form a radial deep groove, and the four arms on the upper hoop frame are arranged correspondingly to the four arms on the lower hoop frame; the upper and lower ends of the first adsorption tube, the second adsorption tube, the third adsorption tube and the fourth adsorption tube are respectively installed from the inside to the outside, and the first adsorption tube, the second adsorption tube, the third adsorption tube and the fourth adsorption tube are provided with a plurality of radial through holes; the lower end edge of the swirl joint is stuck at the step of the enlarged diameter tube on the lower joint, and the upper end is resisted by the locking ring.

[0008] The swirl section is composed of a central column and a plurality of spiral blades connected to the outer side of the central column, and is used to change the flow direction of the liquid.

[0009] The inner and outer surfaces of the first adsorption tube, the second adsorption tube, the third adsorption tube and the fourth adsorption tube are all rough surfaces, which are used for adsorbing, sticking and storing crystal scale.

[0010] The depth of the deep groove is 5 mm.

[0011] The outer diameter of the small-diameter pipe on the upper coupling is equal to the inner diameter of the expanded-diameter pipe.

[0012] The under-pump scale storage device provided by the present invention has the following beneficial effects: simple structure, easy operation, and can be lowered into the wellbore during the operation of the oil well pump, without the need for additional daily manual maintenance; it can effectively solve the practical problem of scaling of the pump barrel and rod pipe, ensure the needs of long-term and low-cost production, and is easy to promote. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a longitudinal partial structural sectional view of the under-pump scale storage device provided by the present invention. DETAILED DESCRIPTION

[0014] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0015] like Figure 1As shown, the pump-down scale storage device provided by the present application comprises an upper joint 1, an upper joint frame 2, a first adsorption pipe 3, a second adsorption pipe 4, a third adsorption pipe 5, a fourth adsorption pipe 6, an outer connecting pipe 7, a lower joint frame 8, a locking ring 9, a cyclone joint 10 and a lower joint 11; the upper and lower ends of the outer connecting pipe 7 are both formed with external threads; the upper joint 1 is integrally formed by a small-diameter pipe at the upper part and an expanded-diameter pipe at the lower part, the inner surface of the small-diameter pipe is formed with internal threads for connecting the lower inlet of the oil pump, and the inner surface of the expanded-diameter pipe is formed with internal threads for cooperating with the external threads of the upper end of the outer connecting pipe 7; the lower joint 11 is integrally formed by an expanded-diameter pipe at the upper part and a small-diameter pipe at the lower part, the upper part of the inner surface of the expanded-diameter pipe is formed with internal threads for cooperating with the external threads of the lower end of the outer connecting pipe 7, the lower part of the inner surface is provided with internal threads for cooperating with the external threads on the outer circumferential surface of the locking ring 9, and the lower end of the inner surface protrudes inwardly to form a step; the small-diameter pipe on the lower joint 11 is used for connecting the tail pipe or the scale storage device; the upper joint frame 2 is a horizontally arranged cross frame, the outer ends of the four arms are fixed to the inner upper part of the outer connecting pipe 7, and the bottom surface of each arm is recessed upwardly to form a radial deep groove; the lower joint frame 8 is also a horizontally arranged cross frame, the outer ends of the four arms are fixed to the inner surface of the expanded-diameter pipe at the middle part of the lower joint 11, the top surface of each arm is recessed downwardly to form a radial deep groove, and the four arms on the upper joint frame 2 are arranged in correspondence with the four arms on the lower joint frame 8; the deep grooves on each arm of the upper joint frame 2 and the corresponding arm of the lower joint frame 8 are respectively spaced outwardly from the inner surface to install the upper and lower ends of the first adsorption pipe 3, the second adsorption pipe 4, the third adsorption pipe 5 and the fourth adsorption pipe 6, and a plurality of radial through holes are arranged on the first adsorption pipe 3, the second adsorption pipe 4, the third adsorption pipe 5 and the fourth adsorption pipe 6; the lower end edge of the cyclone joint 10 is clamped at the step of the expanded-diameter pipe of the lower joint 11, and the upper end is abutted by the locking ring 9.

[0016] The cyclone joint 10 is integrally formed by a central column and a plurality of spiral blades connected to the outer side of the central column, and is used for changing the flow direction of the liquid.

[0017] The inner and outer surfaces of the first adsorption pipe 3, the second adsorption pipe 4, the third adsorption pipe 5 and the fourth adsorption pipe 6 are rough surfaces, which are used for adsorbing, pasting and storing the crystalline scale.

[0018] The depth of the deep groove is 5mm.

[0019] The outer diameter of the small-diameter pipe of the upper joint 1 is equal to the inner diameter of the expanded-diameter pipe.

[0020] The working principle of the pump-down scale storage device provided by the present application is described as follows:

[0021] This pump-down scale storage device is lowered into the wellbore along with the oil well pump. During operation, the liquid pumped out by the oil well pump first flows into the interior of the lower joint 11 through the tail pipe or scale suction and storage device. The swirl joint 10 changes the direction of the liquid flow, evenly distributing the liquid. The liquid then flows upward through the locking ring 9 and into the interior of the external connecting pipe 7. As the liquid flows through the first, second, third, and fourth adsorption tubes 3, 4, 5, and 6 located within the external connecting pipe 7, some of the liquid flows through the radial through-holes in these adsorption tubes. Since the inner and outer surfaces of these adsorption tubes are rough, the crystallized scale in the liquid will be adsorbed and adhere to these rough surfaces, being stored. The descaled liquid then flows upward through the upper coupling 1 into the lower inlet of the oil well pump. If excessive scale accumulates on the adsorption tubes, affecting the descaling effect, the components of the device can be disassembled and the adsorption tubes can be cleaned or replaced.

Claims

1. A scale storage device under the pump, characterized by: The pump lower scale storage device comprises an upper coupling (1), an upper coupling frame (2), a first adsorption tube (3), a second adsorption tube (4), a third adsorption tube (5), a fourth adsorption tube (6), an external connection tube (7), a lower coupling frame (8), a locking ring (9), a swirl joint (10) and a lower joint (11); wherein the outer surfaces of the upper and lower ends of the external connection tube (7) are both formed with external threads; the upper coupling (1) is composed of a small-diameter tube at the upper part and an expanded-diameter tube at the lower part, wherein the inner surface of the small-diameter tube is formed with a thread for connecting The internal thread of the inlet of the lower part of the oil well pump is formed on the inner surface of the expansion pipe with an internal thread for matching with the external thread of the upper end of the external connecting pipe (7); the lower joint (11) is composed of the expansion pipe at the upper part and the small diameter pipe at the lower part, wherein the upper part of the inner surface of the expansion pipe is formed with an internal thread for matching with the external thread of the lower end of the external connecting pipe (7), and the lower part of the inner surface is provided with an internal thread matching with the external thread on the outer circumferential surface of the locking ring (9), and the lower end of the inner surface protrudes inward to form a step; the lower joint (11) is formed with an internal thread for matching with the external thread of the outer circumferential surface of the locking ring (9). The small diameter pipe is used to connect the tail pipe or the dirt suction and storage device; the upper hoop frame (2) is a horizontally arranged cross, the outer ends of the four arms are fixed to the inner upper part of the outer connecting pipe (7), and the bottom surface of each arm is recessed upward to form a radial deep groove; the lower hoop frame (8) is also a horizontally arranged cross, the outer ends of the four arms are fixed to the middle of the inner surface of the expanded diameter pipe on the lower joint (11), and the top surface of each arm is recessed downward to form a radial deep groove, and the four arms on the upper hoop frame (2) correspond to the four arms on the lower hoop frame (8) in the upper and lower directions. The invention is provided with: the upper and lower ends of the first adsorption tube (3), the second adsorption tube (4), the third adsorption tube (5) and the fourth adsorption tube (6) are installed in the deep grooves on each arm of the upper hoop frame (2) and the corresponding arm of the lower hoop frame (8) from the inside to the outside, and the first adsorption tube (3), the second adsorption tube (4), the third adsorption tube (5) and the fourth adsorption tube (6) are all provided with a plurality of radial through holes; the lower end edge of the swirl joint (10) is stuck on the step of the expansion tube on the lower joint (11), and the upper end is supported by the locking ring (9).

2. The under-pump scale storage device according to claim 1, characterized in that: The swirl section (10) is composed of a central column and a plurality of spiral blades connected to the outside of the central column, and is used to change the flow direction of the liquid.

3. The under-pump scale storage device according to claim 1, characterized in that: The inner and outer surfaces of the first adsorption tube (3), the second adsorption tube (4), the third adsorption tube (5) and the fourth adsorption tube (6) are all rough surfaces, and are used for adsorbing, sticking and storing crystal scale.

4. The under-pump scale storage device according to claim 1, characterized in that: The depth of the deep groove is 5 mm.

5. The under-pump scale storage device according to claim 1, characterized in that: The outer diameter of the small-diameter pipe on the upper coupling (1) is equal to the inner diameter of the expanded-diameter pipe.

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