Scale storage device under pump

Abstract

The invention discloses a dirt storage device under a pump. The device comprises an upper coupling, an upper hoop frame, a first adsorption pipe, a second adsorption pipe, a third adsorption pipe, a fourth adsorption pipe, an outer connecting pipe, a lower hoop frame, a locking ring, a rotational flow joint and a lower joint, the upper coupling and the lower joint are connected to the upper and lower ends of the outer connecting pipe; the upper hoop frame, the first adsorption pipe, the second adsorption pipe, the third adsorption pipe, the fourth adsorption pipe, the outer connecting pipe, the lower hoop frame, the locking ring and the rotational flow joint are arranged in the upper coupling, the outer connecting pipe and the lower connector. The dirt storage device under the pump has the following beneficial effects that the structure is simple, operation is easy and convenient, the dirt storage device is tripped into a shaft along with oil well pump operation, and extra manual maintenance operation is not needed in daily life; the actual problem of scaling of the pump cylinder and the rod pipe can be effectively solved, the requirement for long-period and low-cost production is met, and popularization is easy.

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] Scaling in the lifting string of oil wells can cause adverse effects such as pump jamming and pump leakage, which will directly affect pump efficiency and even affect oil well operations, reduce production time and increase production costs, especially in polymer flooding and ternary composite flooding. Rapid progress has been made in scale prevention research at home and abroad, using chemical and physical scale prevention mechanisms. Among them, chemical scale prevention is to prevent inorganic salts from crystallizing and precipitating on the solution and fluid channel walls. The main means is to add chemical anti-scaling agents, which has the problems of high daily maintenance costs and high labor costs, and is contrary to green mine construction; while physical scale prevention is to prevent inorganic salts from depositing on the system wall, allowing inorganic salts to form nuclei or even crystallize in the solution, but requiring such crystals to be suspended in the solution and not adhere to the system wall. It mainly uses heavy metals, ultrasound and other methods, which have the problems of high cost and difficulty in promotion. Therefore, low-cost, pollution-free and long-term scale prevention methods are difficult problems for wells prone to scaling.

[0003] Chinese patent application No. 201210291211.6 discloses an "automatic descaling and anti-stuck oil pump". It is designed with scrapers at the upper and lower ends of the oil pump. During the up and down strokes, the scraped scale and impurities fall into the upper and lower scale storage chambers to prevent them from entering the pump barrel and getting stuck, thus achieving the purpose of descaling and anti-stuck. However, the automatic descaling and anti-stuck oil pump is a method of structurally modifying the oil pump, without considering the adaptability limitations of the modified pump. The pump barrel process is complex and expensive, and cannot meet the needs of complex wellbores such as deep and inclined wells.

[0004] Chinese patent application No. 201710139811.3 discloses "a step-by-step high-power ultrasonic strong pulse anti-scaling and storage device and control scheme". The device adopts a control method in which one trigger main circuit corresponds to a group of transducer coils, making the ultrasonic pulse vibration effect stronger. At the same time, two thyristor main circuits with different connection methods are triggered alternately, so that the two groups of transducer coils work alternately, and a step-by-step control method is adopted. It is used in anti-scaling and descaling equipment to obtain ultrasonic waves without interruption, so that the dynamic film formed by ultrasonic waves on the equipment pipes and plate walls will not be destroyed due to ultrasonic pauses. The device adopts the principle of ultrasonic pulse vibration, which has the problems of high investment and complex on-site operation, and cannot meet the needs of low-cost production.

[0005] Chinese patent application publication No. 116181286 discloses "an annular sheet type anti-scaling alloy tool for downhole oil pumping tools". This tool uses the alloy anti-scaling principle. The inlet external pipe and the outlet external pipe provided at both ends of the anti-scaling device are connected to the pipeline through threaded connection. The anti-scaling alloy sheet group is composed of a number of annular anti-scaling alloy sheets, and downhole oil pumping tools such as sucker rods and oil pumps can pass freely through them. It can reduce the collision and combination of calcium and magnesium ions with carbonate ions in water, and change the structure of scaling crystals, making them easily carried away with the water flow, thereby achieving a good anti-scaling effect. However, there are problems of high cost investment and complex on-site operation, so it cannot meet the needs of 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 comprises 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 integrally 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 at the upper end of the external connecting tube; the lower joint is integrally 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 at 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 pipe 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 pipe 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 in the deep grooves on each arm of the upper hoop frame and the corresponding arms of the lower hoop frame 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 section is stuck at the step of the enlarged diameter pipe on the lower joint, and the upper end is supported by a 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 scale storage device under the pump provided by the present invention has the following beneficial effects: simple structure, easy operation, and can be lowered into the wellbore along with the oil pump operation, without additional daily manual maintenance operations; 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 is described in detail below with reference to the accompanying drawings and specific embodiments.

[0015] like Figure 1As shown, the pump scale storage device provided by the present invention 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 integrally formed by 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 at the upper end of the external connection tube 7; the lower joint 11 is integrally formed by 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 at the lower end of the external connection tube 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 The small-diameter pipe on 11 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 enlarged 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 and the four arms on the lower hoop frame 8 are arranged in correspondence with each other; 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 intervals 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 provided with a plurality of radial through holes; the lower end edge of the swirl section 10 is stuck at the step of the enlarged diameter pipe on the lower joint 11, and the upper end is resisted by the locking ring 9.

[0016] 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.

[0017] 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, which are used for adsorbing, sticking and storing crystal scale.

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

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

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

[0021] The scale storage device under the pump is lowered into the wellbore together with the oil pump. During operation, the liquid extracted by the oil pump first flows into the interior of the lower joint 11 through the tail pipe or the scale suction and storage device. When passing through the swirl joint 10, the swirl joint 10 changes the flow direction of the liquid to make the liquid evenly distributed. Then, it flows upward through the locking ring 9 and flows into the interior of the external connecting pipe 7. When the liquid flows through the first adsorption tube 3, the second adsorption tube 4, the third adsorption tube 5 and the fourth adsorption tube 6 located inside the external connecting pipe 7, part of the liquid will flow into the interior of these adsorption tubes from the radial through holes thereon. Since the inner and outer surfaces of these adsorption tubes are rough surfaces, the crystal scale in the liquid will be adsorbed and adhered to these rough surfaces and stored. After that, the descaled liquid flows upward through the upper coupling 1 into the lower inlet of the oil pump. When there is too much scale on the adsorption tube and the descaling effect is affected, the components on the device can be disassembled to clean or replace the adsorption tube.

Claims

1. A scale storage device under a pump, characterized in that: The pump 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 integrally formed by 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 a thread for connecting The internal thread of the inlet of the lower part of the oil pump is formed on the inner surface of the expansion pipe, and the internal thread used to match the external thread of the upper end of the external connection pipe (7) is formed; the lower joint (11) is composed of the expansion pipe located at the upper part and the small diameter pipe located at the lower part, wherein the upper part of the inner surface of the expansion pipe is formed with an internal thread used to match the external thread of the lower end of the external connection pipe (7), and the lower part of the inner surface is provided with an internal thread matched 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 on the upper part of the expansion pipe and the external thread on the lower end of the expansion pipe. 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 external connection 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 part of the inner surface of the enlarged 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 that: 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 a deep groove from the inside to the outside at intervals in each arm of the upper hoop frame (2) and the corresponding arm of the lower hoop frame (8), and the first adsorption tube (3), the second adsorption tube (4), the third adsorption tube (5) and the fourth adsorption tube (6) are provided with a plurality of radial through holes; the lower end edge of the swirl joint (10) is clamped at the step of the expansion tube on the lower joint (11), and the upper end is supported by a locking ring (9).

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

5. The scale storage device under the pump 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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