Physical and chemical combined scale inhibitor

Abstract

The utility model discloses a physicochemical combined scale inhibitor which comprises an outer cylinder, a through hole is arranged on the outer wall of the lower section of the outer cylinder, a chemical scale inhibition block is arranged in the lower end of the outer cylinder, an anti-scale alloy sheet is arranged in the upper section of the outer cylinder, the lower end of the outer cylinder is connected with a lower joint, and the upper end of the outer cylinder is connected with an upper joint. According to the physicochemical combined scale inhibitor, the problem that scale inhibition, scale removal and paraffin control are difficult to effectively complete by an existing chemical agent or physical method is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of scale prevention, scale removal and wax prevention equipment for oilfield gathering pipelines, and particularly relates to a physical and chemical combined scale inhibitor. Background Art

[0002] Scaling and waxing are one of the most serious problems encountered in oilfields, generally occurring on the surfaces of pipelines in formations or wellbores, injection pipelines and equipment, such as oil well pipelines, high water cut crude oil gathering and transportation systems, filter tanks in sewage stations, and mixed injection systems of oily sewage and groundwater. Scaling brings many harms to production, such as causing an increase in injection pressure and a decrease in the liquid production volume of oil wells, blocking pipelines and local corrosion, increasing energy consumption and reducing heat transfer rate, increasing cleaning time and shutdown maintenance time, etc. Serious ones may lead to safety accidents. The scaling of oil and water pipelines is mainly calcium Ca+, magnesium Mg+, barium Ba+, strontium Sr+, and various polymer precipitates remaining in oil wells during acid fracturing operations. It is difficult to effectively complete scale inhibition, scale removal and wax prevention when using traditional chemical agents or physical methods alone. For example, the utility model patent with the publication number CN221400433U and the patent name "Integrated Scale Inhibitor for Oil Wells" is essentially a typical device for treating scale inhibition by a single chemical method. Content of the Utility Model

[0003] The purpose of the utility model is to provide a physical and chemical combined scale inhibitor to solve the problem that existing chemical agents or physical methods are difficult to effectively complete scale inhibition, scale removal and wax prevention.

[0004] To solve the above technical problems, the utility model discloses a physical and chemical combined scale inhibitor, which includes an outer cylinder. Through holes are arranged on the outer wall of the lower section of the outer cylinder. A chemical scale inhibitor block is arranged inside the lower end of the outer cylinder. An anti-scaling alloy sheet is arranged inside the upper section of the outer cylinder. A lower joint is connected to the lower end of the outer cylinder, and an upper joint is connected to the upper end of the outer cylinder.

[0005] The technical solution of the utility model also has the following characteristics:

[0006] As a further improvement of the technical solution of the utility model, a plurality of the chemical scale inhibitor blocks are provided, and the plurality of chemical scale inhibitor blocks are closely arranged in sequence.

[0007] As a further improvement of the technical solution of the utility model, the anti-scaling alloy sheet is fixed by a pin.

[0008] As a further improvement of the technical solution of the utility model, the number of the anti-scaling alloy sheets is multiple, and they are arranged at a set interval.

[0009] As a further improvement of the technical solution of the utility model, the lower joint and the upper joint are fixed to both ends of the outer cylinder by screws.

[0010] As a further improvement of the technical solution of the present utility model, a sealing gasket is provided in the installation groove.

[0011] Compared with the prior art, a physical and chemical combined scale inhibitor of the present utility model is an anti-scaling, scale-removing, and paraffin-inhibiting device that combines chemical agents and metal alloy sheets. The two methods do not affect each other and complement each other, forming a perfect combination, and can achieve more thorough anti-scaling, scale-removing, and paraffin-inhibiting purposes. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The drawings described herein are used to provide a further understanding of the present utility model and form a part of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation of the present utility model. In the drawings:

[0013] Figure 1 is a schematic structural diagram of a physical and chemical combined scale inhibitor of the present utility model.

[0014] In the figure, 1. upper joint, 2. anti-scaling alloy sheet, 3. screw, 4. lower joint, 5. through hole, 6. chemical scale inhibitor block, 7. outer cylinder. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0015] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation of the present utility model.

[0016] In the description of the present utility model, unless otherwise clearly defined, words such as "set", "installed", and "connected" should be understood in a broad sense. Those skilled in the art can reasonably determine the specific meanings of the above words in the present utility model in combination with the specific content of the technical solution.

[0017] Embodiment 1

[0018] As Figure 1 shown, a physical and chemical combined scale inhibitor of the present utility model includes an outer cylinder 7. A through hole 5 is provided on the outer wall of the lower section of the outer cylinder 7. A chemical scale inhibitor block 6 is provided inside the lower end of the outer cylinder 7. An anti-scaling alloy sheet 2 is provided inside the upper section of the outer cylinder 7. The lower end of the outer cylinder 7 is connected to a lower joint 4, and the upper end of the outer cylinder 7 is connected to an upper joint 1.

[0019] The chemical scale inhibitor block 6 uses chemical agents to remove scale, prevent scale formation, and prevent paraffin deposition. Scale removal is achieved by using acid-type scale inhibitors to remove the scale deposited on the wellbore or surface pipelines. Scale prevention is to use chemical scale inhibitors to control scale crystallization, crystal nucleus growth, and deposition before the formation of scale crystals. The main methods include: preventing nucleation or inhibiting crystal growth, separating crystal nuclei, and controlling scaling cations, mainly by chelating divalent metal ions, preventing deposition, keeping solid-phase particles diffused in water, and preventing deposition on the metal surface. The chemical agent uses a high-molecular chemical high-efficiency scale inhibitor, and a high-efficiency solid scale inhibitor is made based on the chemical scale inhibition mechanism of the high-molecular scale inhibitor containing hydroxyl or sulfonic acid functional groups and installed under the sucker rod pump or under the motor of the electric pump well. The scale inhibitor slowly dissolves in the downhole fluid, and its chemical scale inhibition mechanism is as follows: Solubilization effect: The hydroxyl or sulfonic acid functional groups react with scale ions to produce a solubilization effect for scale prevention. Dispersion effect: Polycarboxylic acid polyions physically or chemically adsorb scale ions, causing the scale ions to adsorb on the polyions and suspend in the fluid. Electrostatic repulsion effect: The high-molecular scale inhibitor has a strong charge density, generating ionic repulsion to prevent inorganic salt particles from contacting each other. Crystal distortion effect: It hinders and interferes with the normal growth of scale, disrupts the normal arrangement of crystals, and causes the scale crystals to distort and not form hard scale.

[0020] The scale prevention alloy sheet 2 achieves scale prevention and scale inhibition in a physical way. A variety of metal elements with different electronegativities are selected, and through unique alloy composition design and strict control of melting preparation. Innumerable non-dissolvable and uniform micro-battery systems are formed in the microstructure of the scale prevention alloy sheet 2. During the full contact with the fluid, solid-liquid-electron interactions occur, thereby adjusting the physical properties of the fluid, affecting the nucleation and growth processes of scale crystals, changing the adhesion and dispersion properties of scale, and achieving excellent scale prevention performance; at the same time, after the scale prevention alloy sheet 2 contacts the fluid, the changes in physical parameters such as surface tension, viscosity, and potential cause the existing old scale to dissolve; and it greatly reduces the occurrence of under-scale corrosion (such as alkali corrosion, acid corrosion, etc.), thereby playing an anti-corrosion role.

[0021] The utility model adopts a combined design of chemical agents and metal alloy sheets. According to the liquid production volume of the oil well and the water cut of the well fluid, a physical and chemical combined scale inhibitor of the utility model is installed below the production screen pipe.

[0022] When assembling a physical and chemical combined scale inhibitor of the utility model, place the chemical scale inhibitor block 6 in the outer cylinder 7 to two-thirds of the cylinder, then place the scale prevention alloy sheet 2. After the installation of the chemical scale inhibitor block 6 and the scale prevention alloy sheet 2 is completed, connect the lower joint 4 and the upper joint 1, and the assembly is completed. It can be lowered into the well according to the operation procedure to play its role.

[0023] Embodiment 2

[0024] As Figure 1As shown, different from Embodiment 1, in a physical and chemical combined scale inhibitor of the present utility model in Embodiment 2, there are multiple chemical scale inhibitor blocks 6, and the multiple chemical scale inhibitor blocks 6 are closely arranged in sequence, so that they can be in more sufficient contact with the fluid to carry out a more thorough chemical reaction, achieving the purposes of scale prevention, scale removal, and wax prevention.

[0025] Embodiment 3

[0026] As Figure 1 shown, different from Embodiment 2, in a physical and chemical combined scale inhibitor of the present utility model in Embodiment 3, the number of anti-scale alloy sheets 2 is multiple, and they are arranged at a set interval, and the anti-scale alloy sheets 2 are fixed by pins. This can ensure that the anti-scale alloy sheets 2 are in contact with the fluid for a long time to achieve better purposes of scale prevention, scale removal, and wax prevention.

[0027] Embodiment 4

[0028] As Figure 1 shown, different from Embodiment 3, in a physical and chemical combined scale inhibitor of the present utility model in Embodiment 4, the lower joint 4 and the upper joint 1 are fixed to both ends of the outer cylinder 7 by screws 3, which is more convenient for disassembly and assembly and facilitates quick installation and disassembly.

[0029] Therefore, compared with the prior art, a physical and chemical combined scale inhibitor of the present utility model is a scale prevention, scale removal, and wax prevention device that combines chemical agents and metal alloy sheets. The two methods do not affect each other and complement each other, forming a perfect combination, and can achieve more thorough purposes of scale prevention, scale removal, and wax prevention.

[0030] The above description shows and describes several preferred embodiments of the utility model. However, as mentioned above, it should be understood that the utility model is not limited to the form disclosed herein, should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications, and environments, and can be changed within the scope of the concept of the utility model described herein through the above teachings or the technology or knowledge in related fields. And any changes and modifications made by those skilled in the art without departing from the spirit and scope of the utility model should fall within the protection scope of the appended claims of the utility model.

Claims

1. A physical and chemical combined scale inhibitor, characterized in that: The invention comprises an outer cylinder (7), wherein a through hole (5) is arranged on the outer wall of the lower section of the outer cylinder (7), a chemical scale-inhibiting block (6) is arranged in the lower end of the outer cylinder (7), an anti-scaling alloy sheet (2) is arranged in the upper section of the outer cylinder (7), the lower end of the outer cylinder (7) is connected to a lower joint (4), and the upper end of the outer cylinder (7) is connected to an upper joint (1).

2. The physical-chemical combined scale inhibitor according to claim 1, characterized in that: There are a plurality of chemical anti-scaling blocks (6), and the plurality of chemical anti-scaling blocks (6) are closely arranged together in sequence.

3. The physical-chemical combined scale inhibitor according to claim 2 is characterized in that: The anti-scaling alloy sheet (2) is fixed by means of pins.

4. The physical-chemical combined scale inhibitor according to claim 3 is characterized in that: The anti-scaling alloy sheets (2) are multiple in number and are arranged at set intervals.

5. The physical-chemical combined scale inhibitor according to claim 4 is characterized in that: The lower joint (4) and the upper joint (1) are fixed to two ends of the outer cylinder (7) by means of screws (3).

Images