Efficient oil removal and purification equipment in deep sea gas field ethylene glycol enrichment system

Abstract

The invention discloses efficient oil removal and purification equipment in a deep sea gas field ethylene glycol enriching system, and belongs to the technical field of petroleum treatment, the efficient oil removal and purification equipment comprises purification equipment composed of multiple stages of oil removal devices, the oil removal devices are connected stage by stage through communicating pipes, and each oil removal device comprises a separation pipe, a coalescence module and an oil removal film module, and the coalescence module and the oil removal film module are arranged in the separation pipe; the coalescence module and the oil removal film module are arranged, a coalescence technology and an oil removal film technology are combined, a set of dual separation system is constructed, the combined technology shows obvious advantages when an oil-water mixture with high emulsification degree is treated, a super-hydrophilic fiber bed layer is arranged in the oil removal film module, the fiber bed layer utilizes a water film barrier effect, and the oil removal effect of the oil-water mixture is improved. According to the oil-water separator, the oil-water mixture can be further captured and polymerized without being completely polymerized by the coalescer, and a multi-layer design is adopted, so that the oil-water mixture is treated for multiple times when passing through the equipment, the whole-process treatment from crude separation to fine separation is realized, and the overall separation efficiency of the equipment is greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of petroleum processing, in particular to high-efficiency oil removal and purification equipment in a glycol-rich system in a deep-sea gas field. Background Art

[0002] The development of deep-sea gas fields usually faces harsh environmental conditions, including high pressure, high temperature and complex fluid properties. In these environments, ethylene glycol-rich systems are widely used in natural gas processing to inhibit the formation of hydrates. However, since a large amount of condensate oil is inevitably produced during the exploitation of oil and gas fields, these oil phase substances often exist in the form of extremely small oil droplets. Especially under the high pressure and low temperature conditions of the deep sea, these oil droplets are easily emulsified to form a stable emulsion, making it difficult for traditional oil-water separation technology to effectively treat them. Under the current technical background, conventional oil-water separation technologies, such as gravity sedimentation and coalescence technology, often show significant limitations when facing oil-water mixtures with high emulsification. Specifically, coalescence technology relies on coalescence fibers to capture tiny oil droplets and achieve oil-water separation by gravity separation. However, as the emulsification degree of oil droplets increases, it is difficult for coalescence fibers to effectively capture these tiny oil droplets, resulting in unstable oil removal effect, especially when treating high-oil-content ethylene glycol-rich solutions, the separation efficiency is difficult to meet the design specification requirements. Based on this, an efficient oil removal and purification equipment in a deep-sea gas field ethylene glycol-rich system is proposed. Summary of the invention

[0003] The purpose of the present invention is to solve the problem that the coalescence technology in the prior art relies on coalescence fibers to capture tiny oil droplets and achieve oil-water separation by gravity separation. However, as the emulsification degree of the oil droplets increases, the coalescence fibers are difficult to effectively capture these tiny oil droplets, resulting in unstable oil removal effect, especially when processing high-oil-content ethylene glycol-rich solutions, the separation efficiency is difficult to meet the design specification requirements, and the proposed high-efficiency oil removal and purification equipment in the deep-sea gas field ethylene glycol-rich system is provided.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions: High-efficiency oil removal and purification equipment in a glycol-rich system of a deep-sea gas field, including a purification equipment composed of a multi-stage oil removal device, wherein the oil removal device is connected step by step through a connecting pipe, and the oil removal device includes a separation tube and a coalescing module and an oil removal film module arranged in the separation tube; The coalescing module comprises an installation end cap installed at the separation tube, a coalescer arranged on the installation end cap, and the coalescer comprises a coagulation metal skeleton and a super oleophilic fiber material layer arranged on the coagulation metal skeleton; The oil removal film module comprises an oil removal pipe installed at the bottom of the separation pipe, an oil remover is arranged in the oil removal pipe, and the oil remover comprises an oil removal film skeleton, a composite hydrophobic layer arranged in a rhombus metal skeleton and a super hydrophilic fiber layer arranged in the outermost layer in order from the inside to the outside; An oil collecting pipe for collecting the aggregated oil is arranged above the separation pipe.

[0005] Preferably, the diamond-shaped metal skeleton comprises an inner skeleton and an outer skeleton, the composite hydrophobic layer is located between the inner skeleton and the outer skeleton, and a water film gap is formed between the composite hydrophobic layer and the outer skeleton to prolong the residence time of the liquid.

[0006] Preferably, the super oleophilic fiber material layer is composed of a fiber structure with a fiber density of 15 microns and densely arranged in a mesh shape.

[0007] Preferably, an oil drain pipeline is provided on the separation tube, and an exhaust valve is provided on the oil drain pipeline.

[0008] Preferably, one end of the connecting pipe is connected to the oil removal pipe, and the other end is connected to the mounting end cover, and the connecting pipe is provided with a sampling port and a flow control device.

[0009] Preferably, the coalescer and the deoiler are both arranged in a truncated cone shape, the coalescer is arranged horizontally, and the deoiler is arranged vertically.

[0010] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention combines the coalescence technology with the oil removal film technology by setting up a coalescence module and an oil removal film module to construct a double separation system. This combined technology shows significant advantages in treating highly emulsified oil-water mixtures, realizing the full process from coarse separation to fine separation, and greatly improving the overall separation efficiency of the equipment.

[0011] 2. In view of the limited space of deep-sea platforms, the present invention adopts a modular design for the oil removal device so that the number and position of modules of the required oil removal device can be flexibly configured according to actual working conditions. While meeting the separation requirements under different working conditions, the equipment can achieve efficient oil-water separation in a limited space, greatly improving the space utilization of the equipment and ensuring efficient operation in a deep-sea environment.

[0012] 3. The present invention uses a new type of super oleophilic fiber material, which has excellent oil droplet capture ability in the oil-water separation process and can effectively aggregate tiny oil droplets in the range of 5-20 microns, greatly improving the efficiency of the agglomerator. By reducing the diameter of the fiber filaments (on average to 15 microns) and adopting a dense arrangement, the surface area and capture efficiency of the fiber are increased, so that the agglomerator can still maintain a high separation effect when processing highly emulsified oil-water mixtures.

[0013] 4. The present invention sets a super-hydrophilic fiber bed layer in the oil removal membrane module. The fiber bed layer uses the water film barrier effect to further capture and aggregate small oil droplets that are not completely aggregated by the agglomerator, thereby achieving more refined oil-water separation and significantly improving the separation accuracy and effect. The oil removal membrane module adopts a multi-layer design, so that the oil-water mixture is processed multiple times when passing through the equipment, which greatly prolongs the residence time and separation path of the oil droplets and ensures efficient separation under high emulsification conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the process of the high-efficiency oil removal and purification equipment in the ethylene glycol-rich system of a deep-sea gas field proposed by the present invention; Figure 2 This is a schematic diagram of the main structure of the high-efficiency oil removal and purification equipment in the deep-sea gas field ethylene glycol-rich system proposed by the present invention; Figure 3 This is a schematic diagram of the structure of a purification device in a high-efficiency oil removal purification device in a deep-sea gas field ethylene glycol-rich system proposed by the present invention; Figure 4 It is a schematic diagram of the three-dimensional structure of the oil removal membrane module in the high-efficiency oil removal and purification equipment in the deep-sea gas field rich ethylene glycol system proposed by the present invention; Figure 5 It is a schematic diagram of the cross-sectional structure of the oil removal membrane module in the high-efficiency oil removal and purification equipment in the deep-sea gas field ethylene glycol-rich system proposed by the present invention.

[0015] In the figure: 1. separation tube; 2. connecting pipe; 3. coalescing module; 301. installation end cover; 302. condensation metal skeleton; 303. super oleophilic fiber material layer; 4. oil removal film module; 401. oil removal tube; 402. oil removal film skeleton; 403. diamond metal skeleton; 404. composite hydrophobic layer; 405. super hydrophilic fiber layer; 406. water film gap cavity; 5. oil collecting pipe; 6. oil discharge pipeline. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0017] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0018] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "mounted / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0019] Example, see Figures 1 to 5 , a high-efficiency oil removal and purification equipment in a deep-sea gas field glycol-rich system, comprising a purification equipment composed of a multi-stage oil removal device, the oil removal device being connected step by step through a connecting pipe 2, the oil removal device comprising a separation tube 1 and a coalescing module 3 and an oil removal film module 4 arranged in the separation tube 1; The coalescing technology used in coalescing module 3 relies on the aggregation and settling of oil droplets. When the emulsification degree in the oil-water mixture is high, the effectiveness of the coalescer is significantly reduced; Experimental data show that when the inlet oil content is high and the emulsification is serious, the outlet oil content is significantly higher than the design requirement, which indicates that when the equipment is processing emulsion, the coalescer fails to effectively aggregate small oil droplets, resulting in poor separation effect. In this scheme, the oil is first coalesced by the coalescing module 3, and then the oil droplets in the form of tiny particles are separated by the oil removal film module 4, which can achieve more complete separation. Considering that the space size of deep-sea production platforms is severely limited, the combination of the coalescence module 3 and the oil removal film module 4 can compensate for the settling time and distance without increasing the size of the equipment, thereby enhancing the aggregation speed and efficiency of the oil droplets, thereby achieving the purpose of extending the settling time and distance.

[0020] The coalescing module 3 comprises an installation end cap 301 installed at the separation tube 1, a coalescer arranged on the installation end cap 301, the coalescer comprises a condensing metal skeleton 302 and a super oleophilic fiber material layer 303 arranged on the condensing metal skeleton 302, the super oleophilic fiber material layer 303 is composed of a fiber structure with a fiber density of 15 microns and densely arranged in a mesh, such a structure helps tiny oil droplets to aggregate into larger oil droplets through the capillary action between the fibers, has excellent oil droplet capture capability during the oil-water separation process, and can effectively aggregate tiny oil droplets within the range of 5-20 microns; namely, the oil droplet aggregation process: tiny oil droplets gradually aggregate under the action of the fiber material to form larger oil droplets, these larger oil droplets gradually detach from the fiber surface due to the increase in volume and settle downward under the action of gravity to form a separated phase, and the surface area and capture efficiency of the fiber are increased by reducing the diameter of the fiber (reduced to 15 microns on average) and adopting a dense arrangement.

[0021] The above structural optimization enables the coalescer to maintain a high separation effect when processing highly emulsified oil-water mixtures.

[0022] The oil removal film module 4 includes an oil removal pipe 401 installed at the bottom of the separation tube 1, and an oil remover is arranged in the oil removal pipe 401. The oil remover includes, from the inside to the outside, an oil removal film skeleton 402, a composite hydrophobic layer 404 arranged in a diamond-shaped metal skeleton 403, and a super hydrophilic fiber layer 405 arranged in the outermost layer. The super hydrophilic fiber layer 405 is composed of multiple layers of composite oil removal fiber material.

[0023] The diamond-shaped metal skeleton 403 includes an inner skeleton and an outer skeleton, and the composite hydrophobic layer 404 is located between the inner skeleton and the outer skeleton, wherein the composite hydrophobic layer 404 is woven and assembled in a W form, and a water film gap cavity 406 is formed between the composite hydrophobic layer 404 and the outer skeleton, which is used to prolong the liquid residence time, and can provide a hydrophilic bed barrier, greatly improving the purity of liquid phase separation, and is suitable for the separation process of 5-10μm droplets.

[0024] The super-hydrophilic fiber layer 405 can form a water film barrier to block and capture small oil droplets remaining in the solution. Due to the existence of the water film barrier, the oil droplets cannot pass through the pores of the super-hydrophilic fiber layer 405. Instead, they are blocked by the water film barrier on the surface of the super-hydrophilic fiber layer 405 and gradually gather into larger oil droplets, which further separates the oil droplets, remains on the surface of the oil removal film, and is finally collected and discharged.

[0025] It is worth noting that the alternative materials of the super oleophilic fiber material used in the super oleophilic fiber material layer 303 in this solution can be replaced by nanomaterials and smart response materials: Nanomaterials: Nanofiber materials are used to replace traditional fibers, and the capture and aggregation of oil droplets are further improved through nanoscale pore structures. These materials can effectively improve the efficiency of coalescers due to their high surface area and special surface properties, especially when dealing with extreme working conditions.

[0026] Smart responsive materials: Use smart materials that are responsive to oil-water interface conditions. These materials can dynamically adjust their surface properties according to the characteristics of the fluid to improve the efficiency of oil-water separation. Such materials can adaptively adjust under complex and changing working conditions, improving the flexibility and adaptability of the overall equipment.

[0027] In this solution, the super hydrophilic fiber layer 405 in the oil removal film module 4 can be selected in a variety of ways, including but not limited to super oleophobic membrane materials and composite membrane materials; Superoleophobic membrane material: The introduction of membrane materials with superoleophobic properties makes it difficult for oil droplets to adhere to the membrane surface, thereby accelerating the aggregation and separation of oil droplets. This type of material is particularly suitable for use in the treatment of high-oil, high-viscosity mixtures, and can further improve the separation effect.

[0028] Composite membrane materials: The composite membrane is made by combining superhydrophilic and superoleophobic materials, which makes the membrane layer have stronger selective separation ability. In different fluid environments, the composite membrane can be separated as needed to ensure the accuracy and efficiency of oil-water separation.

[0029] The coalescer and the deoiler are both arranged in a truncated cone shape, the coalescer is arranged horizontally, and the deoiler is arranged vertically; An oil collecting pipe 5 for collecting the coalesced oil is arranged above the separation pipe 1 , and a level meter is arranged on the oil collecting pipe 5 .

[0030] The separation pipe 1 is provided with an oil discharge pipeline 6, and the oil discharge pipeline 6 is provided with an exhaust valve.

[0031] One end of the connecting pipe 2 is connected to the oil removal pipe 401 , and the other end is connected to the mounting end cover 301 . The connecting pipe 2 is provided with a sampling port and a flow control device.

[0032] The specific purification process of the high-efficiency oil removal and purification equipment designed by the present invention is as follows: when the ethylene glycol-rich solution passes through the connecting pipe 2 and enters the oil removal device, it will first enter the coalescing module 3. The coalescer arranged in the coalescing module 3 will capture the oil droplets in the flow process through the super oleophilic fiber material layer 303 and aggregate them into larger oil droplets. The aggregated oil droplets will float up and finally gather in the oil collecting pipe 5 as they flow; The solution will continue to flow into the oil removal membrane module 4, and the super-hydrophilic fiber layer 405 arranged on the oil remover will further finely intercept and separate the residual oil droplets through the super-hydrophilic fibers, thus performing the function of the multi-stage oil removal device. The solution achieves efficient oil-water separation, and the oil content in the outlet ethylene glycol solution is significantly reduced, meeting the design requirements.

[0033] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. High-efficiency oil removal and purification equipment in the glycol-rich system of deep-sea gas fields, characterized in that: The invention comprises a purification device composed of a multi-stage oil removal device, wherein the oil removal device is connected step by step through a connecting pipe (2), and the oil removal device comprises a separation tube (1) and a coalescing module (3) and an oil removal film module (4) arranged in the separation tube (1); The coalescing module (3) comprises a mounting end cap (301) mounted on the separation tube (1), and a coalescer arranged on the mounting end cap (301), wherein the coalescer comprises a coalescing metal skeleton (302) and a super oleophilic fiber material layer (303) arranged on the coalescing metal skeleton (302); The oil removal film module (4) comprises an oil removal pipe (401) installed at the bottom of the separation pipe (1), an oil remover is arranged in the oil removal pipe (401), and the oil remover comprises, from the inside to the outside, an oil removal film skeleton (402), a composite hydrophobic layer (404) arranged in a rhombus-shaped metal skeleton (403), and a super-hydrophilic fiber layer (405) arranged on the outermost layer; An oil collecting pipe (5) for collecting the agglomerated oil is arranged above the separation pipe (1), and a level gauge is arranged on the oil collecting pipe (5).

2. The high-efficiency oil removal and purification equipment in the deep-sea gas field ethylene glycol-rich system according to claim 1 is characterized in that: The diamond-shaped metal skeleton (403) comprises an inner skeleton and an outer skeleton, the composite hydrophobic layer (404) is located between the inner skeleton and the outer skeleton, and a water film gap cavity (406) is formed between the composite hydrophobic layer (404) and the outer skeleton for extending the residence time of the liquid.

3. The high-efficiency oil removal and purification equipment in the deep-sea gas field ethylene glycol-rich system according to claim 1 is characterized in that: The super oleophilic fiber material layer (303) is composed of a fiber structure with a fiber density of 15 microns and densely arranged in a mesh shape.

4. The high-efficiency oil removal and purification equipment in the deep-sea gas field ethylene glycol-rich system according to claim 1 is characterized in that: The separation tube (1) is provided with an oil discharge pipeline (6), and the oil discharge pipeline (6) is provided with an exhaust valve.

5. The high-efficiency oil removal and purification equipment in the deep-sea gas field ethylene glycol-rich system according to claim 1 is characterized in that: One end of the connecting pipe (2) is connected to the oil removal pipe (401), and the other end is connected to the mounting end cover (301). The connecting pipe (2) is provided with a sampling port and a flow control device.

6. The high-efficiency oil removal and purification equipment in the deep-sea gas field ethylene glycol-rich system according to claim 1, characterized in that: The coalescer and the deoiler are both arranged in a truncated cone shape, the coalescer is arranged horizontally, and the deoiler is arranged vertically.

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