Oil-gas-water three-phase meter

Abstract

The utility model discloses an oil gas water three -phase quantity ware belongs to oil and gas field exploitation analysis technical field. In view of the problem of big gas dissipation error in traditional three -phase measurement, the utility model provides an oil gas water three -phase quantity ware, including the container main part for accommodating oil gas water three -phase material, and the left and right sides of container main part front view are provided with symmetrical volume graduation, container main part inside is provided with the baffle that can move up and down, and the container main part inside is divided into sampling cabin and gas cabin, the bottom of baffle is sealable with container main part inside bottom connection, still including the transport pipe that sets up in sampling cabin, and the transport pipe is provided with rubber ball in, the transport pipe top is connected with the observation cylinder, and the observation cylinder top is provided with the sampling switch for controlling sampling cabin switch, the observation cylinder inside designs the narrow neck of tapering, controls sampling switch, and fills the oil water mixture in sampling cabin.

Description

Technical Field

[0001] This utility model belongs to the field of oil and gas field development and analysis technology, specifically relating to a three-phase measuring instrument containing oil, gas and water. Background Technology

[0002] In the process of oil and gas field development, the accurate measurement of the three-phase components of downhole fluids (oil, gas, and water) is directly related to the accuracy of reserve assessment and the effectiveness of production control.

[0003] Traditional glass separators rely on manual visual inspection of the phase separation interface, but they face three major drawbacks in complex operating conditions such as wells containing escaping gas (e.g., rapid precipitation of dissolved methane) and easily emulsified oil reservoirs: (i) Uncontrolled interference from escaping gas: When sampling at the wellhead, more than 20% of the escaping gas will escape into the atmosphere, which will not only cause the gas phase volume to be underreported, but also cause abnormal casing pressure fluctuations; the oil-water emulsion layer encapsulates air bubbles, resulting in a water content reading deviation of up to ±15%, while conventional rubber plug seals are prone to failure within 30 minutes due to crude oil corrosion. (ii) Mass transfer bottleneck in the separation process: Under normal pressure, bubbles gather slowly, and static separation takes more than 2 hours, resulting in poor operational timeliness; when transferring samples, external force vibration will destroy the already layered phases, causing the consistency error of repeated measurements to exceed 10%; the capillary adsorption of the glass wall can also cause more than 3% loss of oil phase, which is particularly significant in heavy oil reservoirs. (III) Engineering application obstacles: Excessive accumulation of gas mixed with acidic gas can easily cause pitting and leakage of wellhead equipment, resulting in annual maintenance costs of more than 80,000 yuan per well; when the sampling distortion rate of high gas-oil ratio wells (GOR>100 m³ / t) exceeds 30%, it may induce investment decision errors; (IV) Traditional equipment is prone to media embrittlement in cold or desert environments, with an annual replacement rate of more than 40%, and serious lack of field adaptability. Utility Model Content

[0004] To address at least one of the technical problems in existing oil and gas well fluid metering systems, namely, high escape rate of escaping gas, large deviation in water cut readings, low separation efficiency, and frequent risk of container rupture, this utility model provides a three-phase meter containing oil, gas, and water, with the following technical solution: This utility model provides a three-phase measuring instrument containing oil, gas and water, including a container body for containing oil, gas and water three-phase substances, and symmetrical volume scale lines are provided on the left and right sides of the main viewing surface of the container body. The container body is equipped with a vertically movable baffle that divides the interior of the container body into a sampling chamber and an escaping chamber; the bottom of the baffle can be sealed to the bottom of the container body. It also includes a transport pipe installed inside the sampling chamber, and a rubber ball is installed inside the transport pipe; an observation tube is connected to the top of the transport pipe, and a sampling switch for controlling the opening and closing of the sampling chamber is installed at the top of the observation tube. The internal design of the connecting cylinder features a gradually narrowing neck.

[0005] Control the sampling switch to fill the sampling chamber with an oil-water mixture; after the rubber ball floats up and gets stuck in the narrow-necked sealed sampling chamber, move the baffle up to connect the sampling chamber and the escaping chamber. After the liquid levels in the sampling chamber and the escaping chamber have stabilized for a certain period of time, read the volume of the gas layer, oil layer and water layer in the sampling chamber and the escaping chamber through the volume scale line.

[0006] Furthermore, the baffle is connected to the common side wall between the sampling chamber and the escaping chamber. The bottom of the baffle has a wedge-shaped edge, and a groove is provided inside the bottom of the container body. The groove is fixed to the bottom of the common side wall. The wedge-shaped edge at the bottom of the baffle can be embedded into the groove and connected by an interference fit to achieve physical isolation between the sampling chamber and the escaping chamber.

[0007] Furthermore, the main body of the container is a square rigid container.

[0008] Furthermore, the groove adopts a rubber sealing groove.

[0009] Furthermore, a baffle is provided between the side walls of the container body corresponding to the baffle, and the top and side of the baffle are located outside the container body. A sliding groove for the baffle to move up and down is provided inside the baffle.

[0010] Furthermore, the top of the baffle is higher than the top of the gear lever, and a baffle handle is provided on the top of the baffle; lifting the baffle handle causes the baffle to move upward and disengage from the groove, opening the bottom passage of the sampling chamber and the escaping chamber.

[0011] Furthermore, the transport pipe is a cylindrical mesh with vertical mesh channels inside.

[0012] Furthermore, the connecting tube was observed to be transparent, with a conical transparent cavity.

[0013] Furthermore, the sampling switch is funnel-shaped.

[0014] Furthermore, the valve core of the sampling switch adopts a threaded sealing structure.

[0015] Furthermore, the sampling switch and the observation tube are connected as one unit.

[0016] Furthermore, the inner surface of the narrow neck that contacts the rubber ball is polished.

[0017] Furthermore, the narrow neck taper is 5°.

[0018] Compared with the prior art, the present invention has the following beneficial effects: To address the aforementioned pain points, this utility model's three-phase oil-gas-water measuring instrument achieves a breakthrough in reconstructing the separation mechanism through four core technologies: 1. Dual-chamber dynamic isolation design (using baffles to mechanically separate the escaping chamber and the sampling chamber, isolating the gas phase escaping channel in the initial sampling stage to preserve the original gas volume); 2. Narrow-neck self-sealing system (buoyancy rubber balls form a zero-power airtight barrier at the narrow neck of the transparent observation tube, increasing the escaping gas capture rate to ≥95%); 3. Communicating vessel balance control (after lifting the baffle, the liquid levels in the two chambers automatically balance, reducing the reading error caused by pressure difference interference to <0.5%); 4. Rigid and damage-resistant structure (the overall glass / resin molding process enables the equipment to withstand extreme environments from -30℃ to 80℃, extending its service life to more than 5 years).

[0019] Compared to traditional technologies, this device achieves a systemic leap: the gas phase loss rate has been reduced from >20% to <5%, a reduction of 75%; the moisture content error has been reduced from ±10%. Narrowed from ±15% to ±2 ±3%, improving accuracy by 80%; addressing the challenge of severe emulsification failure, an innovative structure promotes automatic demulsification and stratification; operation time is reduced by 85%, significantly improving field efficiency in oilfields.

[0020] This invention addresses the problems of large gas escape errors, cumbersome manual operation, and poor sealing reliability in traditional three-phase measurements by proposing a self-sealing interconnected balancing device. Through a grid-constrained, rubber ball buoyancy-guided mechanism and a gradually narrowing airlock design, zero gas escape is achieved. A baffle-groove dynamic sealing system and dual-sided synchronous scale observation windows, combined with the self-balancing principle of the communicating vessel liquid level, control the separation accuracy of oil, gas, and water layers to within ±1%. This invention improves field testing efficiency and extends the device's service life.

[0021] This three-phase oil, gas and water measuring instrument consists of a two-stage dynamic sealing system composed of volume scale lines, a liftable baffle, an escaping chamber, a sampling chamber, a baffle, a groove, a rubber ball, and a transparent observation tube; a pressure differential self-balancing mechanism is formed by the baffle, the escaping chamber and the sampling chamber; and a rigid, disturbance-resistant, rapid separation body is formed by the rigid medium and the transparent observation tube.

[0022] The volume scale is engraved on the left and right sides of the container body. The stop handle is located on the top left side of the container body, and the groove is located at the bottom of the container body, on the same vertical plane as the stop handle. The baffle is connected to the groove through the stop handle, and the top of the baffle is connected to the baffle handle. The funnel-shaped sampling switch and the transparent observation tube are located together on the top right side of the container body. At the same time, the rubber ball is located inside the cylindrical mesh transport tube, which is connected to the transparent observation tube.

[0023] Compared to traditional glass separators, this invention achieves a comprehensive technological leap through mechanical structural innovation: (1) Revolutionary improvement in precision Escaped gas capture: The dual-stage dynamic seal (baffle isolation + float self-sealing) greatly reduces the gas phase loss rate compared to traditional methods, further improving the reliability of gas-oil ratio (GOR) data; Precise oil-water phase metering: The pressure difference self-balancing mechanism of the communicating vessels eliminates reading fluctuations, and the water content error is narrowed from the traditional ±15% to ±2%, especially overcoming the problem of layering in heavy oil emulsions.

[0024] (2) A qualitative leap in separation efficiency Accelerated demulsification design: The narrow-necked observation tube promotes bubble coalescence, reducing separation time from the traditional 120 seconds. The timeframe has been reduced from 180 minutes to 30 minutes, significantly improving efficiency. Ease of operation: No reliance on electricity or chemical reagents throughout the process; can complete 3 times the sampling volume of traditional equipment in a single day.

[0025] (3) Comprehensive upgrade of safety and reliability Intelligent overpressure relief: The elastic deformation of rubber balls enables the emergency release of trace amounts of gas, reducing the rate of container rupture accidents; Strong environmental adaptability: integral molding of high borosilicate glass / resin, resistant to extreme temperatures of -30℃ to 80℃ and 2MPa impact, extending the service life to 5 years (traditional equipment is replaced 1.2 times per year on average).

[0026] (4) Major breakthrough in scene adaptability High-emission gas wells: maintain a high gas phase capture rate even in wells with a gas-oil ratio > 300 m³ / t; With a purely mechanical design and zero electronic sensors, it achieves in-situ, high-precision, and fast-response separation of fluids in oil and gas wells, advancing the traditional extensive metering mode that relies on experience-based judgment to a data-driven, intelligent, and highly reliable stage, providing underlying technical support for cost reduction, efficiency improvement, and safe production in oil fields. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the external structure of the oil-gas-water three-phase meter in this embodiment; Figure 2 This is a schematic diagram of the overall structure of the three-phase measuring instrument containing oil, gas and water in this embodiment.

[0028] Figure label: 1. Container body; 1-1. Volume scale lines; 2. Groove; 3. Rubber ball; 4. Sampling switch; 5. Observation tube; 5-1. Narrow neck; 6. Baffle handle; 7. Baffle; 8. Baffle lever; 9. Exhaust chamber; 10. Sampling chamber; 11. Transport pipe; Detailed Implementation To make the above-mentioned objectives, features, and advantages of this utility model more apparent and understandable, the present utility model will be described in detail below with reference to the accompanying drawings and specific embodiments. Many specific details are set forth in the following description to provide a full understanding of this utility model. In the description of this embodiment, it should be understood that the terms "upper", "lower", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this embodiment and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0029] Furthermore, those skilled in the art should understand that the accompanying drawings provided herein are for illustrative purposes only and are not necessarily drawn to scale.

[0030] In this embodiment, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0031] Example Combination Figure 1 , Figure 2 As shown, this utility model provides a three-phase measuring instrument containing oil, gas, and water, including a container body 1 for containing the three-phase substances of oil, gas, and water. The container body 1 is a square rigid container. The container body 1 is made entirely of a rigid medium (such as glass or resin).

[0032] Symmetrical volume scale lines 1-1 are provided on the left and right sides of the main viewing surface of the container body 1. Operating components (including sampling switch 4 and observation tube 5) are connected to the top and sides of the container body 1. The bottom is a closed design. All components connected to the container body 1 are directly connected through the rigid container wall or mechanical interface to ensure sealing and functionality.

[0033] The container body 1 has a vertically movable baffle 7 inside, dividing the interior of the container body 1 into two compartments: a sampling compartment 10 and an escaping compartment 9. The baffle 7 is connected to the common side wall between the sampling compartment 10 and the escaping compartment 9. The baffle 7 is designed as a plate-like structure that can slide up and down.

[0034] The bottom of the baffle 7 has a wedge-shaped edge. A groove 2 is provided inside the bottom of the container body 1, and the groove 2 is fixed to the bottom of the common sidewall. The groove 2 uses a rubber sealing groove. The groove 2 serves as the engagement position for the baffle 7, with the wedge-shaped edge of the baffle 7 precisely embedded in the rubber sealing groove of the groove 2. The baffle 7 moves up and down, and its interference fit with the groove 2 ensures zero leakage, achieving physical isolation between the sampling chamber 10 and the venting chamber 9, creating a sealed environment for independent sampling. The interference fit between the baffle 7 and the groove 2 ensures that the sampling chamber 10 and the venting chamber 9 are sealed. Before sampling, keep the inside of the container body 1 clean and dry; during sampling, press the baffle 7 down into the groove 2 to close and isolate the venting chamber 9 from the sampling chamber 10.

[0035] A baffle 8 is provided between the side walls of the container body 1 corresponding to the baffle 7, with the top and sides of the baffle 8 located outside the container body 1. A sliding groove for the baffle 7 to move up and down is provided inside the baffle 8. The top of the baffle 7 is higher than the top of the baffle 8, allowing the baffle 7 to extend outside the container body 1 under the control of the baffle 8. A baffle handle 6 is provided at the top of the baffle 7. The baffle 8 prevents the baffle 7 from being pulled out of the container body 1 due to excessive force.

[0036] Lifting the baffle handle 6 causes the baffle 7 to move upward, disengaging it from the groove 2, opening the channels at the bottom of the sampling chamber 10 and the venting chamber 9. Based on the principle of communicating vessels, free gas in the sampling chamber 10 flows into the venting chamber 9 through the channels, while the liquid in the sampling chamber 10 is exchanged through the bottom channels until the liquid levels on both sides of the sampling chamber 10 and the venting chamber 9 are completely level under the indication of the symmetrical volume scale line 1-1. The venting chamber 9 is used to contain the gas that escapes from the sampling.

[0037] Lifting or pressing down the baffle handle 6 will cause the shift lever 8 to lift or press down accordingly. Pressing down the baffle handle 6 causes the baffle 7 to move vertically downward along the slide groove, and its bottom wedge-shaped edge is precisely embedded in the rubber sealing groove of the groove 2, realizing the physical isolation between the sampling chamber 10 and the vent chamber 9 (the interference fit design of the groove 2 ensures zero leakage), creating a sealed environment for independent sampling.

[0038] The mechanical linkage of baffle handle 6, baffle 7, baffle lever 8, and groove 2 enables dynamic separation and connection between sampling chamber 10 and escape chamber 9.

[0039] The sampling chamber 10 is equipped with a cylindrical mesh-like transport tube 11, which is located to the right of the baffle 7 and contains rubber balls 3. A transparent observation tube 5 is connected to the top of the transport tube 11, and a funnel-shaped sampling switch 4 is installed at the top of the observation tube 5. The sampling switch 4 and the observation tube 5 are connected as one unit.

[0040] The observation tube 5 has a conical transparent cavity; the interior of the observation tube 5 is designed with a tapered polished neck 5-1 with a taper of 5°, which is used for the rubber ball 3 to be self-sealed by air pressure; and the bottom of the observation tube 5 is directly connected to the inlet of the transport pipe 11 corresponding to the top of the sampling chamber 10.

[0041] Sampling switch 4 is closed by turning counterclockwise and opened by turning clockwise. Turn sampling switch 4 90° clockwise to open it. Sampling switch 4 uses a common flat gate valve to prevent leakage. Inject the oil-water mixture into sampling chamber 10 through sampling switch 4. When the oil-water mixture fills sampling chamber 10 to its top surface (i.e., the liquid level is the same), observe the bottom of the base of connecting cylinder 5. Immediately turn sampling switch 4 90° counterclockwise to close it. At this time, the rubber ball 3 in transport pipe 11 will float upwards under the action of buoyancy, breaking free from the grid constraint of transport pipe 11.

[0042] Dissolved gas in the oil-water mixture in sampling chamber 10 escapes, forming a cluster of bubbles. This bubble cluster propels the rubber ball 3 upwards along the vertical grid channel of transport pipe 11, entering the conical transparent cavity through the bottom inlet of observation cylinder 5. Under continuous pressure, the rubber ball 3 eventually engages with the polished narrow neck 5-1 of the observation cylinder 5, which has a gradually narrowing inner diameter. The 5° taper of the polished narrow neck 5-1 causes the rubber ball 3 to deform, generating a radial sealing force that automatically seals the gas escape path, forming an airtight barrier. The grid guidance of transport pipe 11 and the polished narrow neck 5-1 of observation cylinder 5 self-lock to form a gas-sealed chain.

[0043] The integrated sampling switch 4 and observation tube 5 eliminate the risk of interface leakage through structural integration.

[0044] The present invention relates to a method for using a three-phase measuring instrument containing oil, gas, and water: S1. Before sampling, keep the container body 1 clean and dry. When sampling, press down on the baffle 7 into the groove 2 to close the isolation vent chamber 9 and the sampling chamber 10. S2. Turn the funnel-shaped sampling switch 4 to the right and add the oil-water mixture into the sampling chamber 10 through the sampling switch 4. When the sampling liquid level reaches the top surface of the sampling chamber 10, record the injected oil-water mixture as the initial injection volume and perform sampling. After the sampling operation is completed, turn the funnel-shaped sampling switch 4 to the left to close it. S3, the rubber ball 3 is buoyed and enters the transparent observation tube 5. It is gradually subjected to the upward pressure of the escaping gas and gets stuck at the narrow neck 5-1 inside the transparent observation tube 5, thus completing the self-sealing of the sampling chamber 10. S4. Pull up the baffle handle 6. By lifting the baffle 7, the bottom channel between the escaping chamber 9 and the sampling chamber 10 is opened. According to the working principle of communicating vessels, the gas escaping in the sampling chamber 10 enters the escaping chamber 9 through the channel. At the same time, the liquid is exchanged through the bottom channel between the escaping chamber 9 and the sampling chamber 10, so that the liquid levels between the escaping chamber 9 and the sampling chamber 10 are finally equal. S5. After stabilizing for a period of time, the volume of the gas layer, oil layer, and water layer is read by scale to preliminarily determine the overall situation of oil, gas, and water content in the sample.

[0045] Step S5 is as follows: Let it stand for 15 minutes until the oil and water completely separate (oil phase density <0.9g / mL floats, water phase sinks). First, read the value of the gas column at the top of the gas chamber 9 at the volume scale line 1-1 on the left wall (gas layer volume V gas). Then, record the following in sequence on the volume scale line 1-1 on the right wall of sampling chamber 10: height from oil-water interface to liquid level (oil layer volume V oil), and height from bottom of chamber to oil-water interface (water layer volume V water). The final verification showed that the Vgas+Voil+Vwater ratio deviated from the initial injection volume by less than 2%, thus completing the three-phase ratio analysis of oil, gas, and water.

[0046] The dual-sided volume scale lines 1-1 partition calibration ensures accurate and synchronous reading of the three-phase volume.

[0047] This utility model discloses a method for cleaning a three-phase measuring instrument containing oil, gas, and water. To replace samples and clean the oil-gas-water three-phase measuring instrument, this utility model provides a method for sample replacement and cleaning of the oil-gas-water three-phase measuring instrument, including... First, keep the baffle 7 in the raised position (disengaged from the groove 2) to ensure that the sampling chamber 10 and the escaping chamber 9 are fully connected; Turn the funnel-shaped sampling switch 4 to the right, tilt the oil-gas-water three-phase measuring vessel to allow the residual liquid to flow out completely from the sampling switch 4, and if necessary, use a rubber bulb to blow air through the port of switch 4 to assist in the drainage. Use pointed tweezers to remove the rubber ball 3 from the gradually narrowing neck 5-1 of the observation tube 5; Place the rubber ball 3 back into the bottom of the cylindrical mesh transport tube 11 (the ball must fall completely into the bottom groove 2 of the mesh to prevent it from rolling and shifting). Compressed air is injected into the sampling chamber 10 via the sampling switch 4 to purge the chamber walls and the mesh of the transport pipe 11. Place the device in a dust-free environment for 5 minutes, or purge it with a dry nitrogen stream for 30 seconds to accelerate dehumidification.

[0048] The above technical features constitute the preferred embodiment of this utility model, which has strong adaptability and optimal implementation effect. Non-essential technical features can be added or removed according to actual needs to meet the needs of different situations.

[0049] Finally, it should be noted that the above content is only used to illustrate the technical solution of this utility model, and is not intended to limit the scope of protection of this utility model. Simple modifications or equivalent substitutions made by those skilled in the art to the technical solution of this utility model do not depart from the essence and scope of the technical solution of this utility model.

Claims

1. An oil-gas-water three-phase meter comprising, It includes a container body for containing three phases of substances: oil, gas, and water. Symmetrical volume scale lines are provided on the left and right sides of the main viewing surface of the container body. The container body is equipped with a vertically movable baffle that divides the interior of the container body into a sampling chamber and an escaping chamber; the bottom of the baffle can be sealed to the bottom of the container body. It also includes a transport pipe installed inside the sampling chamber, and a rubber ball is installed inside the transport pipe; an observation tube is connected to the top of the transport pipe, and a sampling switch for controlling the opening and closing of the sampling chamber is installed at the top of the observation tube. The internal design of the connecting cylinder features a gradually narrowing neck.

2. An oil-gas-water three-phase meter according to claim 1, characterized in that, The baffle is connected to the common side wall between the sampling chamber and the escaping chamber. The bottom of the baffle has a wedge-shaped edge, and a groove is provided at the bottom of the container body. The groove is fixed to the bottom of the common side wall. The wedge-shaped edge at the bottom of the baffle can be embedded into the groove and connected with an interference fit.

3. An oil-gas-water three-phase meter according to claim 1, characterized in that, The main body of the container is a square rigid container.

4. An oil-gas-water three-phase meter according to claim 2, wherein, The groove is sealed with rubber.

5. An oil-gas-water three-phase meter according to claim 1, wherein, A baffle is provided between the side walls of the container body corresponding to the baffle, and the top and side of the baffle are located outside the container body. A sliding groove for the baffle to move up and down is provided inside the baffle.

6. An oil-gas-water three-phase meter according to claim 5, wherein, The top of the baffle is higher than the top of the gear lever, and a baffle handle is provided on the top of the baffle; lifting the baffle handle will cause the baffle to move upward and disengage from the groove, opening the bottom passage of the sampling chamber and the escaping chamber.

7. An oil-gas-water three-phase meter according to claim 1, characterized in that, The transport pipe is a cylindrical mesh with vertical mesh channels inside.

8. An oil-gas-water three-phase meter according to claim 1, wherein, The connecting tube is transparent and has a cone-shaped transparent cavity.

9. An oil-gas-water three-phase meter according to claim 1, wherein, The sampling switch is funnel-shaped.

10. An oil-gas-water three-phase meter according to claim 9, wherein, The valve core of the sampling switch adopts a threaded sealing structure.

11. An oil-gas-water three-phase meter according to claim 1, characterized in that, The sampling switch and the observation tube are connected as one unit.

12. An oil-gas-water three-phase meter according to claim 1, characterized in that, The inner surface of the narrow neck that contacts the rubber ball is polished.

13. A three-phase measuring instrument containing oil, gas, and water according to claim 12, characterized in that, Narrow neck taper 5°.

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