A wax deposition assay flash filter

Abstract

The utility model discloses a wax deposition determination flash filter relates to the petroleum chemical industry detection equipment field, including filter main part, two groups of filter inlet joint, bar hollow support, filter screen and netted support, through the combination design of bar hollow support and filter screen, netted support makes filter screen installation stable, can effectively resist high pressure fluid impact, prevents the collapse, through the pull bar hollow support, takes out the whole filter screen and netted support whole, has realized the quick sampling of deposit and the convenient replacement of filter screen, and filter screen design can replace, makes the device can nimblely adapt to the multiple crude oil system of different wax crystal size, promotes the experimental flexibility and repeatability, provides high reliability data support for wax deposition mechanism research and prevention and control technology development, widens the application range.

Description

Technical Field

[0001] This utility model relates to the field of petrochemical testing equipment, and in particular to a flash filter for measuring wax deposition. Background Technology

[0002] Wax deposition in crude oil is a common problem in the petroleum industry, directly affecting pipeline transportation efficiency and equipment safety. Therefore, accurately simulating formation conditions and measuring wax deposition characteristics in the laboratory is crucial for predicting and preventing wax deposition.

[0003] Existing flash filters for wax deposition determination have the following technical defects:

[0004] 1. Insufficient adaptability to extreme conditions: Most filters have a temperature limit of ≤100℃ and a pressure limit of ≤70MPa, which cannot cover the testing requirements of high-temperature and high-pressure crude oil samples from deep sea and deep wells;

[0005] 2. Inappropriate filter parameter design: If the filter length is too short (≤3cm), the wax deposition contact time will be insufficient, and if the porosity is too low (<25%), it will easily cause blockage and affect the accuracy of the measurement results;

[0006] 3. Poor structural stability: The filter unit is prone to deformation and leakage under high temperature and high pressure, and lacks a sealing and support structure that can withstand high temperature and high pressure;

[0007] 4. Low parameter control accuracy: temperature fluctuation ≥ ±2℃, pressure fluctuation ≥ ±1MPa, unable to simulate the wax deposition environment under real working conditions.

[0008] The aforementioned problems constrain the reliability of wax deposition measurements, so we propose a flash filter for wax deposition measurements to address these issues. Utility Model Content

[0009] The purpose of this invention is to provide a flash filter for measuring wax deposition, so as to solve the problems mentioned in the background art.

[0010] To achieve the above objectives, this utility model provides the following technical solution: a flash filter for wax deposition measurement, comprising a filter assembly, which includes:

[0011] The filter body has a flash evaporation chamber inside;

[0012] Two sets of filter inlet connectors are respectively located at both ends of the filter body and connected to the flash chamber;

[0013] A rod-shaped hollow support is disposed in the flash chamber;

[0014] A mesh support is provided at the outlet end of the flash chamber, and a filter screen is installed on the mesh support;

[0015] The filter screen slides along the rod-shaped hollow support until it fits against the mesh support. The rod-shaped hollow support is designed to be removable so that the filter screen and the mesh support can be taken out together when the filter screen is pulled out.

[0016] Preferably, the inner walls on both sides of the filter body are provided with threaded grooves, and the outer peripheral wall of the filter inlet connector is provided with threaded teeth, which are threadedly connected to the threaded grooves.

[0017] Preferably, one end of the filter inlet connector is provided with a contact end, which is attached to the inner wall of the inlet or outlet end of the flash chamber.

[0018] Preferably, the filter inlet connector has an internal conveying channel that communicates with the flash chamber.

[0019] Preferably, the inlet of the filter assembly is connected to an inlet micro valve via an inlet pipe, and the outer peripheral wall of the inlet pipe is wrapped with a filter inlet heat insulation heating belt to maintain the temperature of the crude oil sample flowing through the pipeline.

[0020] Preferably, the filter body is externally wrapped with an oil bath temperature control module to precisely control the temperature inside the flash chamber.

[0021] Preferably, the outlet of the filter assembly is connected to a filter outlet piston container via a delivery pipe, and a high-precision injection pump pressure control module is connected downstream of the filter outlet piston container via a pipeline.

[0022] Preferably, the filter body is integrally formed from 316L stainless steel.

[0023] The technical effects and advantages of this utility model are as follows:

[0024] The combination design of the rod-shaped hollow support with the filter screen and mesh support ensures stable installation of the filter screen, effectively resisting the impact of high-pressure fluid and preventing collapse. The entire filter screen and mesh support can be removed by simply pulling the rod-shaped hollow support, enabling rapid sampling of sediments and convenient replacement of the filter screen. The filter screen is designed to be replaceable and adaptable to different crude oil systems, improving experimental flexibility and repeatability, and providing highly reliable data support for the study of wax deposition mechanisms and the development of control technologies.

[0025] The filter body is made of 316L stainless steel in one piece, and key components are made of stainless steel or Teflon composite materials, which ensures that the entire filter body unit can withstand extreme test conditions of ≥100MPa and ≥200℃ for a long time, and solves the problems of equipment deformation and leakage under high pressure and high temperature.

[0026] The reaction chamber is precisely controlled by an oil bath temperature control module, and combined with the coordinated feedback of the high-precision injection pump pressure control module and the outlet piston container, stable and precise control of the system pressure is achieved. The high-precision temperature and pressure control environment can more realistically simulate the constant temperature and pressure conditions of the formation, ensuring that wax crystals are accurately precipitated at the set flash point, thereby improving the accuracy of wax precipitation point determination and deposition rate calculation.

[0027] By installing a heat-insulating heating belt on the inlet pipeline, the problem of temperature drop and premature wax crystal precipitation caused by heat dissipation from the pipeline before the high-temperature crude oil sample enters the core reaction zone is effectively avoided. This ensures that the wax precipitation reaction occurs in a controlled flash chamber, eliminating interference.

[0028] The optimized filter length ensures full contact between the crude oil sample and the stainless steel filter, maintaining the sample at the required experimental temperature to promote wax deposition. The filter mesh size can be selected and replaced within the range of 0.5μm-100μm, allowing the device to flexibly adapt to various crude oil systems with different wax crystal sizes, thus broadening its application range. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0030] Figure 2 This is the overall structure of the flash filter of this utility model;

[0031] Figure 3 This is a cross-sectional view of the filter assembly of this utility model;

[0032] Figure 4 This is a schematic diagram of the filter inlet connector structure of this utility model.

[0033] In the diagram: 1. Filter assembly; 11. Filter body; 111. Threaded groove; 12. Filter inlet connector; 121. Thread; 122. Contact end; 123. Conveying channel; 13. Rod-shaped hollow support; 14. Filter screen; 15. Mesh support; 16. Flash chamber; 2. Inlet micro valve; 3. Oil bath temperature control module; 4. Filter outlet piston container; 5. High-precision injection pump pressure control module; 6. Filter inlet insulation heating belt. Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0035] This utility model provides, for example Figure 1 - Figure 4 The flash filter for measuring wax deposition shown includes a filter assembly 1 comprising a filter body 11, two sets of filter inlet connectors 12, a rod-shaped hollow support 13, a filter screen 14, and a mesh support 15.

[0036] The filter body 11 has a flash chamber 16 inside. The flash chamber 16 is used to hold the crude oil sample to be tested and to provide a specific space for the physical process of flashing the crude oil sample. The filter body 11 is made of 316L stainless steel in one piece and has a pressure resistance of ≥100MPa and a temperature resistance of ≥200℃.

[0037] Two sets of filter inlet connectors 12 are located at both ends of the filter body 11, and the filter body 11 and the filter inlet connectors 12 are sealed by threads;

[0038] A rod-shaped hollow support 13 is disposed in the flash chamber 16, and a mesh support 15 is disposed at the end of the flash chamber 16.

[0039] The length of the rod-shaped hollow support 13 is set to 7cm to ensure the contact time for wax deposition. The size of the filter screen 14 can be selected between 0.5μm and 100μm to adapt to the size of crude oil wax crystals. The rod-shaped hollow support 13 and the filter screen 14 are stainless steel composite supports or Teflon composite supports, which can prevent deformation under high temperature and pressure and ensure the filtration effect.

[0040] A filter screen 14 is installed on the mesh support 15. The filter screen 14 is installed at the outlet of the flash chamber 16 through the mesh support 15. The mesh support 15 is used to trap the wax crystals, so that they are deposited on the inner wall of the flash chamber 16 to form a measurable deposition layer.

[0041] By sliding the filter screen 14 along the rod-shaped hollow support 13 until it fits against the mesh support 15, the filter screen 14 is installed with the mesh support 15. At the same time, the filter screen 14 is supported by the flash chamber 16 to prevent the filter screen 14 from collapsing under pressure.

[0042] Furthermore, through the design of the rod-shaped hollow support 13, when replacing the filter screen 14, the filter screen 14 and the mesh support 15 can be pulled out by pulling the rod-shaped hollow support 13 out of the flash chamber 16, thus completing the removal of the filter screen 14 and facilitating its disassembly.

[0043] By replacing the filter screen 14 with different pore sizes, it can be adapted to various crude oil systems, improving test repeatability and data reliability.

[0044] After the experiment, the exhaust port was opened to release the residual pressure. First, the filter inlet connectors 12 at both ends of the filter body 11 were disassembled, and then the rod-shaped hollow support 13 was taken out. At this time, the filter screen 14 pushed the wax deposit layer in the flash chamber 16 out of the flash chamber 16, which facilitated the weighing and composition analysis of the wax deposit layer. Combined with the pressure changes and temperature records before and after, the deposition rate and wax precipitation point were calculated.

[0045] The inner walls on both sides of the filter body 11 are provided with threaded grooves 111, and the outer peripheral wall of the filter inlet connector 12 is provided with threaded teeth 121. The threaded teeth 121 are threadedly connected to the threaded grooves 111, which is used to install the filter inlet connector 12 on both sides of the filter body 11.

[0046] One end of the filter inlet connector 12 is provided with a contact end 122, which is attached to the inlet or outlet end of the flash chamber 16 and is used to fit against the inner wall of the flash chamber 16.

[0047] The filter inlet connector 12 has a conveying channel 123 inside, which is connected to the inside of the flash chamber 16. The crude oil sample is conveyed to the flash chamber 16 through the conveying channel 123.

[0048] The flash chamber 16 has an internal volume of 20-50 ml. This size design ensures that the injected crude oil sample can fully react within the flash chamber 16. The flash chamber 16 is the key reaction area for achieving the experimental objective. After the crude oil sample is injected into the flash chamber 16 through the filter inlet connector 12, it is precisely controlled to the temperature and pressure conditions set in the experiment within the flash chamber 16. Subsequently, the crude oil sample undergoes flash evaporation, which promotes the precipitation of wax crystals in the crude oil sample, preparing it for subsequent filtration and determination.

[0049] Working principle: Crude oil samples under formation temperature and pressure conditions are injected into flash chamber 16 through filter inlet connectors 12 at both ends and internal conveying channels 123.

[0050] The entire filter body 11 is tightly wrapped and precisely heated by the external oil bath temperature control module 3, so that the flash chamber 16 can quickly reach and stabilize at the high temperature and high pressure environment set in the experiment.

[0051] Inside the flash chamber 16, the high-temperature and high-pressure crude oil sample undergoes a flash evaporation process, causing a rapid change in the fluid state, which leads to the crystallization and precipitation of the dissolved wax. The fluid carrying the wax crystals flows towards the outlet under pressure.

[0052] The filter screen 14 installed on the mesh support 15 at the outlet end performs filtration. The filter screen 14 selects a specific pore size according to the size of the wax crystals to effectively trap the wax crystals. The trapped wax crystals gradually accumulate on the surface of the filter screen 14 and on the inner wall of the upstream flash chamber 16 channel to form a stable solid deposition layer.

[0053] After the experiment, the system is depressurized and cooled. By disassembling the filter inlet connector 12 and pulling out the rod-shaped hollow support 13, the filter screen 14 and the mesh support 15 installed on it, along with the complete wax deposition layer trapped on their surface, can be taken out as a whole from the flash evaporation chamber 16. Subsequently, the deposition layer can be weighed, its composition analyzed, and other follow-up processing can be performed to calculate key parameters such as the amount of wax deposition.

[0054] Example 1: Inlet micro valve 2, which is connected to filter assembly 1 through inlet pipe, and the outer peripheral wall of inlet pipe is wrapped with filter inlet heat insulation heating belt 6;

[0055] The filter inlet connector 12 is connected to the pipeline by means of a metal thread seal to ensure no leakage at 100MPa.

[0056] The filter inlet heat insulation and heating belt 6 is wrapped around the outer wall of the inlet pipe between the inlet micro valve 2 and the filter assembly 1. The filter inlet heat insulation and heating belt 6 is used to heat the inlet pipe. The filter inlet heat insulation and heating belt 6 maintains the temperature of the crude oil sample before it enters the filter assembly 1 by heating, preventing the temperature of the crude oil sample from dropping due to heat dissipation in the pipe, which would cause wax crystals to precipitate prematurely before entering the flash chamber 16, thus interfering with the accuracy of the experiment.

[0057] The oil bath temperature control module 3 is used to precisely control the temperature of the filter assembly 1. It achieves efficient heat conduction by tightly adhering the circulating hot oil to the outer wall of the filter assembly 1, thereby precisely controlling the internal temperature of the filter assembly 1 at the set value with a fluctuation range of ≤ ±0.5℃.

[0058] The filter outlet piston container 4 is connected to the outlet of the filter assembly 1 through a delivery pipe. The filter outlet piston container 4 is a buffer and collection container located at the outlet of the filter assembly 1.

[0059] The high-precision injection pump pressure control module 5 is used for pressure control and fluid drive. The high-precision injection pump pressure control module 5 usually operates in constant pressure mode. By precisely adjusting its discharge rate or flow rate, it controls the pressure of the entire filter assembly 1, especially the outlet pressure, to ensure that the fluctuation of the test pressure is ≤ ±0.1MPa. The high-precision injection pump pressure control module 5 is responsible for extracting and measuring the fluid in the filter outlet piston container 4.

[0060] The filter outlet piston container 4 has two main functions:

[0061] The first is to store the fluid after filtration and flash evaporation, which is the crude oil after the wax crystals are trapped;

[0062] Secondly, it works in conjunction with the high-precision injection pump pressure control module 5 to maintain the stability of the outlet pressure of the filter assembly 1.

[0063] Working principle: The crude oil sample first flows through the inlet micro valve 2, and the flow rate of the crude oil sample is controlled by the inlet micro valve 2. The crude oil sample flows through the inlet pipeline between the filter assembly 1 and the inlet micro valve 2. The temperature of the crude oil sample is maintained by wrapping the inlet pipeline with the filter inlet heat insulation heating belt 6.

[0064] Then, the crude oil sample enters the inlet micro-valve 2 through the inlet pipe, and is precisely heated inside the filter assembly 1 by the oil bath temperature control module 3, which is wrapped around the filter assembly 1.

[0065] Inside the filter assembly 1, the sample flashes under set conditions, the wax crystals are trapped by the internal filter screen 14, and the remaining fluid flows out from the outlet. The outlet fluid first enters the filter outlet piston container 4 for temporary storage. The high-precision injection pump pressure control module 5 is connected downstream of the filter outlet piston container 4 through a pipeline. By drawing fluid and providing feedback adjustment, it works in conjunction with the filter outlet piston container 4 to maintain the precise and stable system pressure.

[0066] Example 2: Sample injection: A crude oil sample under formation temperature and pressure conditions is injected into filter assembly 1 from the inlet;

[0067] Parameter adjustment: Set the temperature to 120℃ and the pressure to 90MPa. The internal temperature of the filter assembly 1 is precisely controlled by the oil bath temperature control module 3, and the outlet pressure of the filter assembly 1 is controlled by the high-precision injection pump pressure control module 5. The parameters are stabilized to a fluctuation of ≤±0.5MPa / ±1℃.

[0068] Flash filtration: The sample is fully flashed in the flash chamber 16, and the generated wax crystals flow through the filter screen 14 with the fluid. They are intercepted by the filter screen 14 and gradually accumulate on the filter screen 14 and the inner wall of the flash chamber 16 channel, forming a stable deposition layer.

[0069] Measurement and analysis: Inject an appropriate amount of oil sample, use nitrogen gas at the experimental temperature and pressure to displace the residual crude oil in filter assembly 1, cool to room temperature, and remove the rod-shaped hollow support 13, thereby removing the filter screen 14 and the mesh support 15, completing the removal of the filter element, and weighing to calculate the amount of wax deposition.

[0070] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A flash filter for measuring wax deposition, characterized in that, Includes a filter component (1), which includes: The filter body (11) has a flash chamber (16) inside. Two sets of filter inlet connectors (12) are respectively located at both ends of the filter body (11) and connected to the flash chamber (16); A rod-shaped hollow support (13) is disposed in the flash chamber (16); A mesh support (15) is provided at the outlet end of the flash chamber (16), and a filter screen (14) is installed on the mesh support (15). The filter screen (14) slides along the rod-shaped hollow support (13) until it fits against the mesh support (15). The rod-shaped hollow support (13) is designed to be removable so that the filter screen (14) and the mesh support (15) can be removed together when the filter screen (14) is removed.

2. The flash filter for measuring wax deposition according to claim 1, characterized in that, The filter body (11) has threaded grooves (111) on both sides of its inner wall, and the filter inlet connector (12) has threaded teeth (121) on its outer peripheral wall. The threaded teeth (121) are threadedly connected to the threaded grooves (111).

3. The flash filter for measuring wax deposition according to claim 1, characterized in that, One end of the filter inlet connector (12) is provided with a contact end (122), which is attached to the inner wall of the inlet or outlet end of the flash chamber (16).

4. The flash filter for measuring wax deposition according to claim 1, characterized in that, The filter inlet connector (12) has a conveying channel (123) that communicates with the flash chamber (16).

5. A flash filter for measuring wax deposition according to claim 1, characterized in that, The inlet of the filter assembly (1) is connected to an inlet micro valve (2) through an inlet pipe, and the outer periphery of the inlet pipe is wrapped with a filter inlet heat insulation heating belt (6) to maintain the temperature of the crude oil sample flowing through the pipeline.

6. The flash filter for measuring wax deposition according to claim 1, characterized in that, The filter body (11) is wrapped with an oil bath temperature control module (3) to precisely control the temperature inside the flash chamber (16).

7. The flash filter for measuring wax deposition according to claim 1, characterized in that, The outlet of the filter assembly (1) is connected to the filter outlet piston container (4) via a delivery pipe, and the downstream of the filter outlet piston container (4) is connected to a high-precision injection pump pressure control module (5) via a pipeline.

8. The flash filter for measuring wax deposition according to claim 1, characterized in that, The filter body (11) is integrally formed from 316L stainless steel.

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