Single-well crude oil three-phase metering device

Abstract

The utility model provides a single well crude oil three-phase metering device which comprises an inlet pipeline, a measuring pipeline, a bypass pipeline and an outlet pipeline which are connected in sequence, a one-way safety valve is arranged between the measuring pipeline and the outlet pipeline, and the inlet pipeline is connected with the measuring pipeline and the bypass pipeline through an inlet ultra-thin ball valve and a bypass ultra-thin ball valve respectively. The outlet pipeline is connected with the measuring pipeline through an outlet ultrathin ball valve, and the outlet pipeline is directly communicated with the bypass pipeline; the ultrasonic flowmeter is arranged on the outer wall of the bypass pipeline; the device further comprises an actuator and a signal processing controller, the actuator is in transmission connection with the inlet ultra-thin ball valve, the outlet ultra-thin ball valve and the bypass ultra-thin ball valve, and the signal processing controller controls operation of the actuator and processing of measurement signals. The utility model has the advantages of simple structure, small volume and low cost, and can accurately measure the volume flow of oil, water and gas in the crude oil produced by a single well without separating the crude oil.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid online measurement, in particular to a single-well crude oil three-phase metering device. Background Art

[0002] Crude oil single-well metering is of great significance for understanding the changing patterns of oil well production capacity and three-phase content in different production periods of a single well, adjusting and optimizing oil displacement and pumping production parameters, and ensuring stable production, increased production and energy conservation.

[0003] During crude oil collection, the proportions and production of oil, gas and water phases in the output vary greatly at different development stages and under different well conditions, and the components and physical properties of each phase also change accordingly, which brings great difficulties to phase measurement.

[0004] Currently, produced fluids from wellheads in oilfields are mostly delivered through manifolds from multiple wells into metering rooms or tanks. Gas and liquid are separated within the flow path and then individually metered. However, simple two-phase or three-phase separation and metering devices struggle to achieve complete separation, leading to large metering errors. Complex metering devices are expensive and unsuitable for single-well deployment. In short, there are currently few products on the market for direct metering of mixed gas-liquid flow lines at wellheads, and their application is severely limited. Utility Model Content

[0005] The purpose of the utility model is to provide a single well crude oil three-phase metering device with simple structure, small size, low cost, and the ability to provide relatively accurate flow measurement of the volume flow of oil, water and gas in the crude oil produced by a single well without separating the crude oil.

[0006] In order to achieve the above-mentioned purpose, the present invention is implemented through the following technical solutions:

[0007] A single-well crude oil three-phase metering device includes an inlet pipe, a measuring pipe, a bypass pipe, and an outlet pipe connected in sequence, a one-way safety valve being provided between the measuring pipe and the outlet pipe, the inlet pipe being connected to the measuring pipe and the bypass pipe respectively via an inlet ultra-thin ball valve and a bypass ultra-thin ball valve, the outlet pipe being connected to the measuring pipe via the outlet ultra-thin ball valve, and the outlet pipe being directly connected to the bypass pipe; the device also includes an ultrasonic flowmeter provided on the outer wall of the bypass pipe; an actuator and a signal processing controller, the actuator being respectively connected to the inlet ultra-thin ball valve, the outlet ultra-thin ball valve, and the bypass ultra-thin ball valve in transmission, and the signal processing controller controlling the operation of the actuator and the processing of the measurement signal.

[0008] Furthermore, the wall thickness of the bypass pipe does not exceed 5 mm.

[0009] Furthermore, a water content measuring instrument consisting of a measuring head and a measuring probe is provided in the measuring pipeline.

[0010] Compared with the prior art, the present invention has the following advantages:

[0011] The present invention provides a single-well crude oil three-phase metering device with a simple structure, small size, and low cost. It can provide relatively accurate flow measurement of the volumetric flow rates of oil, water, and gas in the crude oil produced by a single well without separating the crude oil. Specifically, the device adopts a flexible and timely Doppler ultrasonic flow velocity measurement method, making the metering process simpler and more reliable. The device adopts a dual-pipe structure, intercepting liquid within the measurement pipeline for static measurement, avoiding interference with the measurement results caused by problems such as unstable liquid flow, large changes in gas content, and high impurities. After measurement with a water content meter, relevant compensation is performed to accurately measure the various parameters of the three-phase fluid, while effectively solving the current technical difficulties in the water content measurement industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0013] Figure numerals: 1. Inlet pipe; 2. Inlet ultra-thin ball valve; 3. Measuring pipe; 4. Actuator; 5. Outlet ultra-thin ball valve; 6. Signal processing controller; 7. Bypass pipe; 8. Bypass ultra-thin ball valve; 9. One-way safety valve; 10. Outlet pipe; 11. Ultrasonic flowmeter; 12. Measuring probe. DETAILED DESCRIPTION

[0014] The embodiments of the present invention are described in further detail below with reference to the accompanying drawings.

[0015] This utility model provides a single-well crude oil three-phase metering device. Generally speaking, it consists of two parts: an ultrasonic flowmeter 11 and an online crude oil water content measurement device. The ultrasonic flowmeter 11 uses the Doppler ultrasound principle to measure the flow velocity of the liquid inside the pipeline; the online crude oil water content measurement device measures the water content and gas-liquid ratio of the liquid inside the pipeline through online sampling and static measurement. The following metering methods can be used to calculate the liquid volume, water volume, oil volume, and gas volume, respectively:

[0016] (1) Liquid volume

[0017] Q i =v*S;

[0018] Among them, Q i is the cumulative liquid volume of oil, gas and water, v is the liquid flow rate value detected by the ultrasonic flowmeter, and S is the cross-sectional area of ​​the bypass pipe.

[0019] (2) Water volume

[0020] Q w =Q i *W;

[0021] Among them, Q w is the accumulated water content, and W is the water content detected by the online measurement equipment for the water content of crude oil.

[0022] (3) Oil volume

[0023] Q o =Q i *(1-W);

[0024] Among them, Q o is the cumulative oil volume, and (1-W) is the oil content in the liquid.

[0025] (4) Capacity

[0026] Q g =Q i *G;

[0027] Among them, Q g is the cumulative gas volume, and G is the gas-liquid ratio detected by the online crude oil water content measurement equipment. When the crude oil contains gas, the measuring pipe 3 will not be filled with liquid, and part of the volume will be filled with gas. The gas volume is the total volume of the measuring chamber minus the measured liquid volume. The gas volume is divided by the liquid volume to obtain the gas-liquid ratio G.

[0028] The specific structure of the utility model is as follows Figure 1 As shown, a single-well crude oil three-phase metering device includes an inlet pipeline 1, a measuring pipeline 3, a bypass pipeline 7, and an outlet pipeline 10 connected in sequence, a one-way safety valve 9 is provided between the measuring pipeline 3 and the outlet pipeline 10, the inlet pipeline 1 is connected to the measuring pipeline 3 and the bypass pipeline 7 respectively through the inlet ultra-thin ball valve 2 and the bypass ultra-thin ball valve 8, the outlet pipeline 10 is connected to the measuring pipeline 3 through the outlet ultra-thin ball valve 5, and the outlet pipeline 10 is directly connected to the bypass pipeline 7; the device also includes an ultrasonic flowmeter 11, the ultrasonic flowmeter 11 is provided on the outer wall of the bypass pipeline 7, and the wall thickness of the bypass pipeline 7 does not exceed 5 mm; the device also includes an actuator 4 and a signal processing controller 6, the actuator 4 is respectively connected to the inlet ultra-thin ball valve 2, the outlet ultra-thin ball valve 5, and the bypass ultra-thin ball valve 8, and the signal processing controller 6 controls the operation of the actuator 4 and the processing of the measurement signal.

[0029] The output shaft of the actuator 4 gear is fixedly connected to the driving wheel, the bypass ultra-thin ball valve 8 is connected to the bypass driven wheel, the inlet ultra-thin ball valve 2 and the outlet ultra-thin ball valve 5 are connected together through the measuring driven wheel, and the switching states of the two are consistent. The switching states of the bypass ultra-thin ball valve 8 are opposite to those of the inlet ultra-thin ball valve 2. The rotation of the driving wheel drives the bypass driven wheel and the measuring driven wheel to rotate synchronously.

[0030] The measuring pipe 3 is equipped with a water content meter consisting of a measuring head and a measuring probe. The measuring probe is composed of multiple electrode probes that work together. The multiple metal electrode probes used for measurement are evenly arranged from top to bottom in the center of the measuring pipe 3. Each electrode probe detects the dielectric constant of the liquid between the outer shell and the pipe, and based on this value, identifies the liquid level and the oil-water interface in the pipe. The processor in the measuring head combines the volume value corresponding to each electrode probe with the total pipe volume and the volume contribution of each metal electrode probe to calculate the oil-water ratio.

[0031] The working principle of the present utility model is as follows: after the equipment is powered on, the actuator 4 is controlled by the signal processing controller 6, and the gear transmission of the actuator 4 drives the inlet ultra-thin ball valve 2, the bypass ultra-thin ball valve 8 and the outlet ultra-thin ball valve 5 to rotate 90 degrees. At this time, the bypass pipe 7 is blocked, and the measured oil, gas and water three-phase mixture only flows through the measuring pipe 3; when the measurement starting time point set in the signal processing controller 6 is arrived, the signal processing controller 6 controls the actuator 4 to work again, and the gear transmission of the actuator 4 drives the inlet ultra-thin ball valve 2, the bypass ultra-thin ball valve 8 and the outlet ultra-thin ball valve 5 to rotate 90 degrees. At this time, the measuring pipe 3 is blocked and the bypass pipe 7 is opened. The measured oil, gas and water three-phase mixture only flows through the bypass pipe 7, and the ultrasonic flowmeter 11 starts measuring; the oil, gas and water three-phase mixture flowing through the measuring pipe 3 is intercepted and sampled, and the measuring head starts heating measurement and analysis. When the measurement time set by the signal processing controller 6 is reached, the signal processing controller 6 controls the actuator 4 to work again. The gear transmission of the actuator 4 drives the inlet ultra-thin ball valve 2, the bypass ultra-thin ball valve 8 and the outlet ultra-thin ball valve 5 to rotate 90 degrees. At this time, the bypass pipe 7 is blocked, and the liquid inside the pipe passes through the measuring pipe 3, taking away the liquid intercepted and retained in the pipe last time, and entering the next sampling measurement cycle.

[0032] The above is only a preferred embodiment of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and modifications without departing from the concept of the present invention. These improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A single-well crude oil three-phase metering device, comprising an inlet pipe, a measuring pipe, a bypass pipe, and an outlet pipe connected in sequence, with a one-way safety valve provided between the measuring pipe and the outlet pipe, characterized in that: The inlet pipe is connected to the measuring pipe and the bypass pipe through the inlet ultra-thin ball valve and the bypass ultra-thin ball valve respectively, the outlet pipe is connected to the measuring pipe through the outlet ultra-thin ball valve, and the outlet pipe is directly connected to the bypass pipe; it also includes an ultrasonic flowmeter, which is arranged on the outer wall of the bypass pipe; it also includes an actuator and a signal processing controller, the actuator is respectively connected to the inlet ultra-thin ball valve, the outlet ultra-thin ball valve and the bypass ultra-thin ball valve, and the signal processing controller controls the operation of the actuator and the processing of the measurement signal.

2. The single-well crude oil three-phase metering device according to claim 1, characterized in that: The wall thickness of the bypass pipe does not exceed 5 mm.

3. The single-well crude oil three-phase metering device according to claim 1, characterized in that: A water content measuring instrument composed of a measuring head and a measuring probe is arranged in the measuring pipeline.

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