Oil well production metering device, metering method

Abstract

The present application relates to a kind of oil well metering technical field, and is a kind of oil well production metering device, metering method, the former includes the pipeline expansion pipe being connected with upper chamber in the upper part of upper chamber, siphon pipe and communication pipe are arranged between upper chamber and lower chamber, siphon pipe inlet is connected with upper chamber, siphon pipe outlet is connected with lower chamber, siphon pipe upper portion elbow pipe is located in the upper part of upper chamber, water content measuring instrument is arranged on siphon pipe, liquid level sensing unit is set at the position corresponding siphon pipe upper portion elbow pipe and siphon pipe inlet in the inside or outside of upper chamber, the end of communication pipe is connected with upper chamber at the position higher than siphon pipe upper portion elbow pipe.The present application utilizes siphon principle to realize the change of oil well production output from irregular oil-gas mixed phase flow to regular gas or liquid single phase flow, realizes the metering of oil well production output, and the metering result can meet the accuracy required by oilfield geology, and the cost is low, safe and reliable, and the degree of automation is high.

Description

Technical Field

[0001] This invention relates to the field of oil well metering technology, specifically an oil well production metering device and method. Background Technology

[0002] Measuring oil well production is an important task in oilfield production management. Accurate and timely measurement of oil well production is of great guiding significance for understanding reservoir conditions and formulating production plans.

[0003] Currently, the commonly used methods for measuring oil well production in this oilfield mainly include: 1. Single-tank oil measurement at the well site; 2. Gas measurement using an orifice plate on a single-volume separator in the metering room; 3. Gas measurement using a mass flow meter on a single-volume separator in the metering room; and 4. Oil measurement using a single-well dynamometer chart. These methods have the following problems during the measurement process:

[0004] 1. Low level of automation and high labor intensity;

[0005] 2. High degree of manual intervention and low compatibility with oilfield automation systems;

[0006] 3. Mass flow meters have high testing costs, and the reduction in the diameter of the metering pipeline poses safety hazards;

[0007] 4. The measurement accuracy is unstable. Summary of the Invention

[0008] This invention provides an oil well production metering device and method that overcomes the shortcomings of the prior art and can effectively solve the problems of low automation and high cost of existing oil well production metering methods.

[0009] One of the technical solutions of the present invention is achieved through the following measures: an oil well production metering device, comprising:

[0010] The metering and acquisition device includes an upper chamber and a lower chamber. An expanded-diameter pipe connected to the upper chamber is installed at the upper part of the upper chamber, and an output pipe connected to the lower chamber is installed at the bottom of the lower chamber. A siphon and a connecting pipe are installed between the upper and lower chambers. The inlet of the siphon is connected to the lower part of the upper chamber, and the outlet of the siphon is connected to the upper part of the lower chamber. The upper bend of the siphon is located at the upper part of the upper chamber. A water content measuring instrument is installed at the outlet of the siphon. A liquid flow sensing unit is installed on the pipe wall on one side of the siphon corresponding to the outlet. One end of the connecting pipe is connected to the upper chamber at a position higher than the upper bend of the siphon, and the other end of the connecting pipe is connected to the upper part of the lower chamber.

[0011] The metering and processing device measures the daily oil production of the oil well based on the liquid flow sensing data output by the liquid flow sensing unit per unit time and the instantaneous water cut output by the water cut measuring instrument.

[0012] The following are further optimizations and / or improvements to the above-mentioned technical solution:

[0013] The aforementioned metering processing device includes:

[0014] The front-end transmission module communicates with the water content measuring instrument and the liquid flow sensing unit;

[0015] The metering and control module determines the number of siphons per unit time and the corresponding average comprehensive water cut based on the liquid flow sensing data output by the liquid flow sensing unit and the instantaneous water cut output by the water cut meter, and measures the oil production of the well on that day.

[0016] The above also includes an upper liquid level sensing unit and a lower liquid level sensing unit. The upper liquid level sensing unit is located inside or outside the upper chamber at the position corresponding to the upper bend of the siphon tube, and the lower liquid level sensing unit is located inside or outside the upper chamber at the position corresponding to the liquid inlet of the siphon tube.

[0017] The aforementioned metering processing device also includes a timing module;

[0018] The front-end transmission module communicates with the water content measuring instrument, the liquid flow sensing unit, the upper liquid level sensing unit, and the lower liquid level sensing unit.

[0019] The timing module uses the initial liquid level data collected by the liquid level sensing unit at the siphon inlet as the start trigger condition and the initial liquid level data collected by the liquid level sensing unit at the upper bend of the siphon as the stop trigger condition to time the process and obtain the liquid level rise time corresponding to each siphon occurrence per unit time.

[0020] The metering and control module determines the average liquid level rise time and average comprehensive water cut corresponding to each siphon occurrence per unit time, and measures the oil well production for the day.

[0021] The aforementioned metering and processing device also includes a back-end transmission module for transmitting the oil well production volume to a remote location.

[0022] The above also includes a gas acquisition unit and a gas measurement unit installed on the connecting pipe to measure the gas flowing through the connecting pipe.

[0023] The second technical solution of the present invention is achieved through the following measures: an oil well production measurement method, comprising:

[0024] The gas-liquid mixture produced by the oil well undergoes preliminary gas-liquid separation through the pipeline expansion pipe and then enters the upper chamber for further gas-liquid separation.

[0025] After gas-liquid separation, the gas accumulates in the upper part of the upper chamber, enters the lower chamber through the connecting pipe, and flows out together with the liquid in the lower chamber through the output pipeline. The liquid after gas-liquid separation accumulates at the bottom of the upper chamber, and the liquid level gradually rises.

[0026] When the liquid level in the upper chamber exceeds the upper bend of the siphon tube, a siphon phenomenon occurs, and the liquid flows into the lower chamber through the siphon tube outlet. The liquid flow sensing unit and the water content measuring instrument acquire liquid flow sensing data and instantaneous water content. The gas in the lower chamber enters the upper chamber through the connecting pipe. When the liquid level in the upper chamber drops below the siphon tube inlet, the siphon phenomenon stops, and the liquid level begins to rise again until the siphon phenomenon occurs again, and the cycle repeats.

[0027] The metering processing device determines the oil well production for the day based on the liquid flow sensing data output by the liquid flow sensing unit per unit time and the instantaneous water cut output by the water cut measuring instrument.

[0028] The following are further optimizations and / or improvements to the above-mentioned technical solution:

[0029] The aforementioned metering and processing device determines the oil well production for the day based on the liquid flow sensing data output by the liquid flow sensing unit per unit time and the instantaneous water cut output by the water cut measuring instrument, including:

[0030] The front-end transmission module communicates with the moisture content measuring instrument and the liquid flow sensing unit to obtain the liquid flow sensing data output by the liquid flow sensing unit and the instantaneous moisture content output by the moisture content measuring instrument per unit time.

[0031] The metering and control module determines the number of siphoning events per unit time and the corresponding average comprehensive water cut per unit time, and calculates the daily oil well production V using the following formula. 油 :

[0032]

[0033] Among them, t 单位 V is the unit of time; n is the siphoning that occurs per unit of time; V 虹吸 This represents the volume of liquid corresponding to one siphon. This represents the average overall moisture content per unit time. P1 represents the instantaneous moisture content, and k represents the number of instantaneous moisture contents output by the moisture meter per unit time.

[0034] The above also includes upper and lower liquid level sensing units collecting liquid level data at corresponding locations. The metering and processing device uses the liquid level data to obtain the liquid level rise time corresponding to each siphon occurrence per unit time, and combines the liquid level rise time corresponding to each siphon occurrence with all instantaneous water cuts collected by the water cut measuring instrument to measure the oil well production, including:

[0035] The liquid level data initially collected by the liquid level sensing unit at the siphon inlet is used as the start trigger condition, and the liquid level data initially collected by the liquid level sensing unit at the upper bend of the siphon is used as the stop trigger condition for timing. The timing module obtains the liquid level rise time corresponding to each siphon occurrence within a unit of time.

[0036] The metering and control module determines the average liquid level rise time and average comprehensive water cut corresponding to each siphon occurrence based on the liquid level rise time and the instantaneous water cut collected by the water cut meter during each siphon occurrence per unit time, and measures the oil well production.

[0037] The aforementioned metering and control module determines the average liquid level rise time and average comprehensive water cut corresponding to each siphon occurrence based on the liquid level rise time and instantaneous water cut collected by the water cut meter during each siphon occurrence per unit time, and measures the oil well production, including:

[0038] Calculate the average liquid level rise time and average overall water content corresponding to one siphon occurrence;

[0039]

[0040]

[0041] in, t1 represents the average liquid level rise time corresponding to one siphon occurrence; t2 represents the liquid level rise time corresponding to a specific occurrence within a unit of time; m represents the total number of siphon occurrences within a unit of time. This represents the average overall moisture content corresponding to one siphon occurrence; This represents the average overall moisture content corresponding to a single siphon occurrence within a unit of time. P1 represents the instantaneous moisture content collected during a single siphon occurrence within a unit of time, and n represents the number of instantaneous moisture contents collected during a single siphon occurrence within a unit of time.

[0042] Calculate the daily oil well production V 油 :

[0043]

[0044] in, V represents the average liquid level rise time corresponding to one siphon occurrence; 虹吸 This represents the volume of liquid corresponding to one siphon. This represents the average overall moisture content corresponding to a single siphon event.

[0045] This invention utilizes the siphon principle to transform the irregular mixed flow of oil and gas in oil wells into a regular single-phase flow of gas or liquid, thereby achieving the measurement of oil well products. The measurement results can meet the accuracy requirements of oilfield geology, and are low in cost, safe and reliable, and highly automated. Attached Figure Description

[0046] Appendix Figure 1 This is a schematic diagram of the metering and data acquisition device of the present invention.

[0047] Appendix Figure 2 This is a schematic diagram of the circuit structure of a device according to the present invention.

[0048] Appendix Figure 3 This is a schematic diagram of the circuit structure of another device according to the present invention.

[0049] Appendix Figure 4 This is a schematic diagram of another device circuit structure according to the present invention.

[0050] Appendix Figure 5 This is a flowchart of one method of the present invention.

[0051] Appendix Figure 6 This is a flowchart of another method of the present invention.

[0052] The codes in the attached diagram are as follows: 1 is the upper chamber, 2 is the lower chamber, 3 is the pipeline expansion pipe, 4 is the output pipeline, 5 is the connecting pipe, 6 is the water content measuring instrument, 7 is the gas collection unit, 8 is the siphon pipe, 9 is the liquid flow sensing unit, 10 is the upper liquid level sensing unit, and 11 is the lower liquid level sensing unit. Detailed Implementation

[0053] The present invention is not limited to the following embodiments, and the specific implementation can be determined according to the technical solution of the present invention and the actual situation.

[0054] The present invention will be further described below with reference to embodiments and accompanying drawings:

[0055] Example 1: As shown in the attached document Figure 1 , 2 As shown, an embodiment of the present invention discloses an oil well production metering device, comprising:

[0056] The metering and acquisition device includes an upper chamber 1 and a lower chamber 2. An expansion pipe 3 connected to the upper chamber 1 is provided at the upper part of the upper chamber 1. An output pipe 4 connected to the lower chamber 2 is provided at the bottom of the lower chamber 2. A siphon pipe 8 and a connecting pipe 5 are provided between the upper chamber 1 and the lower chamber 2. The inlet of the siphon pipe 8 is connected to the upper part of the upper chamber 1, and the outlet of the siphon pipe 8 is connected to the lower part of the lower chamber 2. The upper bend of the siphon pipe 8 is located at the upper part of the upper chamber 1. A water content measuring instrument 6 is provided at the outlet of the siphon pipe 8. A liquid flow sensing unit 9 is provided on the pipe wall on one side of the siphon pipe 1 corresponding to the outlet. One end of the connecting pipe 5 is connected to the upper chamber 1 at a position higher than the upper bend of the siphon pipe 8, and the other end of the connecting pipe 5 is connected to the upper part of the lower chamber 2.

[0057] The metering and processing device measures the daily oil well production based on the liquid flow sensing data output by the liquid flow sensing unit 9 and the instantaneous water cut output by the water cut measuring instrument 6 within a unit time.

[0058] This invention discloses an oil well production metering device that uses the siphon principle to transform the irregular mixed flow of oil and gas in the oil well into a regular single-phase flow of gas or liquid, thereby realizing the metering of the oil well production. The metering results can meet the accuracy requirements of oilfield geology, and the device is low in cost, safe and reliable, and highly automated.

[0059] Specifically, this includes:

[0060] (i) The gas-liquid mixture produced by the oil well is initially separated into gas and liquid by the pipeline expansion pipe 3 and then enters the upper chamber 1 for further gas-liquid separation. The gas passes through the upper part of the upper chamber 1 and enters the lower chamber 2 through the connecting pipe 5. It flows out through the output pipeline 4 together with the liquid in the lower chamber 2. The liquid accumulates at the bottom of the upper chamber 1 and the liquid level gradually rises. When the liquid level exceeds the upper bend of the siphon pipe, a siphon phenomenon occurs. The liquid flows into the lower chamber 2 through the siphon pipe inlet. The gas in the lower chamber 2 enters the upper chamber 1 through the connecting pipe 4. When the liquid level in the upper chamber 1 drops to the siphon pipe inlet, the siphon phenomenon stops. Then the liquid level starts to rise again until the siphon phenomenon occurs again, and the cycle repeats.

[0061] (II) As attached Figure 2 As shown, the metering processing device includes:

[0062] The front-end transmission module communicates with the water content measuring instrument 6 and the liquid flow sensing unit;

[0063] The metering and control module, based on the liquid flow sensing data output by the liquid flow sensing unit and the instantaneous water cut output by the water cut meter, determines the number of siphoning operations per unit time and the corresponding average comprehensive water cut per unit time, and measures the oil well production V for the day. 油 :

[0064]

[0065] Among them, t 单位 V is the unit of time; n is the number of siphons that occur per unit of time; 虹吸 This represents the volume of liquid corresponding to one siphon. This represents the average overall moisture content per unit time. P1 represents the instantaneous moisture content, and k represents the number of instantaneous moisture contents output by the moisture meter per unit time.

[0066] The number of siphons occurring per unit time is determined based on the liquid flow sensing data output by the liquid flow sensing unit per unit time. For example, if the liquid flow sensing unit continuously collects liquid flow sensing data, it is determined that a siphon is occurring. If the liquid flow sensing unit collects liquid flow sensing data again after a certain period of time following the previous collection of liquid flow sensing data, it is determined that a new siphon has occurred, thereby determining the number of siphons occurring per unit time.

[0067] Example 2: As shown in the attached document Figure 1 , 3 As shown, an embodiment of the present invention discloses an oil well production metering device, comprising:

[0068] The metering and data acquisition device includes an upper chamber 1 and a lower chamber 2. An expanded-diameter pipe 3, connected to the upper chamber 1, is installed at the top of the upper chamber 1. An output pipe 4, connected to the lower chamber 2, is installed at the bottom of the lower chamber 2. A siphon pipe 8 and a connecting pipe 5 are installed between the upper chamber 1 and the lower chamber 2. The inlet of the siphon pipe is connected to the upper part of the upper chamber 1, and the outlet of the siphon pipe is connected to the lower part of the lower chamber 2. The upper bend of the siphon pipe 8 is located at the upper part of the upper chamber 1. A water-containing container is provided at the outlet of the siphon pipe 8. The measuring instrument 6 has a liquid flow sensing unit 9 installed on the side wall of the siphon tube 1 corresponding to the liquid outlet. One end of the connecting pipe 5 is connected to the upper chamber 1 at a position higher than the upper bend of the siphon tube 8, and the other end of the connecting pipe 5 is connected to the upper part of the lower chamber 2. An upper liquid level sensing unit 10 is installed inside or outside the upper chamber 1 at a position corresponding to the upper bend of the siphon tube 8, and a lower liquid level sensing unit 11 is installed inside or outside the upper chamber 1 at a position corresponding to the liquid inlet of the siphon tube 8.

[0069] The metering and processing device uses liquid level data to obtain the liquid level rise time corresponding to each siphon occurrence per unit time, and combines the liquid level rise time corresponding to each siphon occurrence with all instantaneous water cuts collected by the water cut measuring instrument to measure the oil production of the oil well.

[0070] Both the lower limit liquid level sensing module 11 and the upper limit liquid level sensing module 10 can be liquid level sensors. The lower limit liquid level sensing module 11 is located at the liquid inlet of the siphon tube 8, or slightly higher than the liquid inlet of the siphon tube 8. The upper limit liquid level sensing module 10 is located at the upper bend of the siphon tube 8, or slightly lower than the upper bend of the siphon tube 8, so that the metering and processing device can accurately determine the liquid level rise time corresponding to one siphon.

[0071] Specifically, this includes:

[0072] (i) The gas-liquid mixture produced by the oil well is initially separated into gas and liquid by the pipeline expansion pipe 3 and then enters the upper chamber 1 for further gas-liquid separation. The gas passes through the upper part of the upper chamber 1 and enters the lower chamber 2 through the connecting pipe 5. It flows out through the output pipeline 4 together with the liquid in the lower chamber 2. The liquid accumulates at the bottom of the upper chamber 1 and the liquid level gradually rises. When the liquid level exceeds the upper bend of the siphon pipe, a siphon phenomenon occurs. The liquid flows into the lower chamber 2 through the siphon pipe inlet. The gas in the lower chamber 2 enters the upper chamber 1 through the connecting pipe 4. When the liquid level in the upper chamber 1 drops to the siphon pipe inlet, the siphon phenomenon stops. Then the liquid level starts to rise again until the siphon phenomenon occurs again, and the cycle repeats.

[0073] (II) As attached Figure 3 As shown, the metering processing device includes:

[0074] The front-end transmission module communicates with the water content measuring instrument 6, the liquid flow sensing unit 9, the upper liquid level sensing unit 10, and the lower liquid level sensing unit 11.

[0075] The timing module uses the liquid level data initially collected by the liquid level sensing unit 11 at the liquid inlet of the siphon tube 8 as the start trigger condition and the liquid level data initially collected by the liquid level sensing unit 10 at the upper bend of the siphon tube 8 as the stop trigger condition to perform timing, thereby obtaining the liquid level rise time corresponding to each siphon occurrence within a unit of time.

[0076] The metering and control module can determine the number of siphons per unit time and the corresponding average comprehensive water content per unit time based on the liquid flow sensing data output by the liquid flow sensing unit 9 and the instantaneous water content output by the water content measuring instrument, and measure the oil production of the well on the same day. It can also determine the average liquid level rise time and average comprehensive water content corresponding to a single siphon within a unit time, and measure the oil production of the well on the same day.

[0077] Specifically, based on the liquid flow sensing data output by the liquid flow sensing unit 9 and the instantaneous water cut output by the water cut meter within a unit time, the number of siphons and the corresponding average comprehensive water cut within a unit time are determined. The process of measuring the oil well production for the day is as described in the embodiment. The oil well production obtained in this way can be used as a preliminary measurement for scenarios with large measurement needs and less stringent accuracy requirements. The method of determining the average liquid level rise time and average comprehensive water cut corresponding to one siphon occurrence within a unit time and measuring the oil well production for the day is suitable for scenarios with strict accuracy requirements.

[0078] The average liquid level rise time and average comprehensive water cut corresponding to each siphon occurrence within a unit time are determined, and the oil production of the oil well on that day is measured using the following formula;

[0079]

[0080] in, V represents the average liquid level rise time corresponding to one siphon occurrence; 虹吸 The volume of liquid corresponding to one siphon can be specifically calculated using the average liquid level rise time and the volume coefficient of the upper chamber 1. This represents the average overall moisture content corresponding to a single siphon event.

[0081] Example 3: As shown in the attached document Figure 1 , 4 As shown, this embodiment of the invention discloses an oil well production metering device, which is an optimization of the above embodiment. It further includes a gas acquisition unit 7 and a gas measurement unit disposed on the connecting pipe 5 to measure the gas flowing through the connecting pipe 5.

[0082] The gas measuring unit 7 is installed on the connecting pipe 5. The gas measuring unit 7 can be a natural gas measuring instrument, which collects the gas flowing through the connecting pipe 5 and sends it to the metering and processing device to measure the gas production of the oil well.

[0083] The specific calculation of gas production from oil wells includes:

[0084]

[0085] in, This represents the average liquid level rise time corresponding to one siphon occurrence. q气 The value of the flowing gas measured by gas measuring unit 7 during the average liquid level rise time.

[0086] Example 4: This embodiment of the invention discloses an oil well production metering device, which is an optimization of the above embodiment. The metering processing device further includes a back-end transmission module to transmit the oil well production volume to a remote location.

[0087] The aforementioned backend transmission module can send the data received and measured by the metering processing device to a remote location.

[0088] Example 5: As shown in the attached document Figure 5 As shown in the figure, an embodiment of the present invention discloses an oil well production measurement method, characterized in that it includes:

[0089] In step S101, the gas-liquid mixture produced by the oil well undergoes preliminary gas-liquid separation through the pipeline expansion pipe 3, and then enters the upper chamber 1 for further gas-liquid separation.

[0090] In step S102, the gas after gas-liquid separation gathers in the upper part of the upper chamber 1, enters the lower chamber 2 through the connecting pipe 5, and flows out through the output pipe 4 together with the liquid in the lower chamber 2. The liquid after gas-liquid separation gathers at the bottom of the upper chamber 1, and the liquid level gradually rises.

[0091] In step S103, when the liquid level in the upper chamber 1 exceeds the upper bend of the siphon tube 8, a siphon phenomenon occurs, and the liquid flows into the lower chamber 2 through the outlet of the siphon tube 8. The liquid flow sensing unit 9 and the water content measuring instrument 6 acquire liquid flow sensing data and instantaneous water content. The gas in the lower chamber 2 enters the upper chamber 1 through the connecting pipe 5. When the liquid level in the upper chamber 1 drops below the inlet of the siphon tube 8, the siphon phenomenon stops, and the liquid level begins to rise until the siphon phenomenon occurs again, and the cycle repeats.

[0092] In step S104, the metering processing device determines the oil well production for the day based on the liquid flow sensing data output by the liquid flow sensing unit per unit time and the instantaneous water cut output by the water cut measuring instrument.

[0093] The above step S104 specifically includes:

[0094] (i) The front-end transmission module communicates with the water content measuring instrument and the liquid flow sensing unit to obtain the liquid flow sensing data output by the liquid flow sensing unit and the instantaneous water content output by the water content measuring instrument per unit time.

[0095] (ii) The metering and control module determines the number of siphons occurring per unit time and the average comprehensive water cut corresponding to each siphon, and calculates the daily oil well production V using the following formula. 油 :

[0096]

[0097] Among them, t 单位 V is the unit of time; n is the siphoning that occurs per unit of time; V 虹吸 This represents the volume of liquid corresponding to one siphon. This represents the average overall moisture content per unit time. P1 represents the instantaneous moisture content, and k represents the number of instantaneous moisture contents output by the moisture meter per unit time.

[0098] Example 6: As attached Figure 6 As shown in the figure, an embodiment of the present invention discloses an oil well production measurement method, characterized in that it includes:

[0099] In step S201, the gas-liquid mixture produced by the oil well undergoes preliminary gas-liquid separation through the pipeline expansion pipe 3, and then enters the upper chamber 1 for further gas-liquid separation.

[0100] In step S202, the gas after gas-liquid separation gathers in the upper part of the upper chamber 1, enters the lower chamber 2 through the connecting pipe 5, and flows out through the output pipe 4 together with the liquid in the lower chamber 2. The liquid after gas-liquid separation gathers at the bottom of the upper chamber 1, and the liquid level gradually rises.

[0101] In step S203, when the liquid level in the upper chamber 1 exceeds the upper bend of the siphon tube 8, a siphon phenomenon occurs, and the liquid flows into the lower chamber 2 through the outlet of the siphon tube 8. The liquid flow sensing unit 9 and the water content measuring instrument 6 acquire liquid flow sensing data and instantaneous water content. The gas in the lower chamber 2 enters the upper chamber 1 through the connecting pipe 5. When the liquid level in the upper chamber 1 drops below the inlet of the siphon tube 8, the siphon phenomenon stops, and the liquid level begins to rise until the siphon phenomenon occurs again, and the cycle repeats.

[0102] In step S204, the upper liquid level sensing unit 10 and the lower liquid level sensing unit 11 collect liquid level data at corresponding positions. The metering and processing device uses the liquid level data to obtain the liquid level rise time corresponding to each siphon occurrence within a unit time, and combines the liquid level rise time corresponding to each siphon occurrence with all instantaneous water cuts collected by the water cut measuring instrument to measure the oil well production.

[0103] The above step S204 specifically includes:

[0104] (a) The liquid level data initially collected by the liquid level sensing unit at the siphon inlet is used as the start trigger condition, and the liquid level data initially collected by the liquid level sensing unit at the upper bend of the siphon is used as the stop trigger condition for timing. The timing module obtains the liquid level rise time corresponding to each siphon occurrence within a unit of time.

[0105] (II) The metering and control module determines the corresponding average comprehensive water cut based on the liquid level rise time corresponding to each siphon occurrence per unit time, then determines the average liquid level rise time and average comprehensive water cut corresponding to another siphon occurrence, and measures the oil well production, including:

[0106] (1) Calculate the average liquid level rise time and average overall water content corresponding to one siphon occurrence;

[0107]

[0108]

[0109] in, t1 represents the average liquid level rise time corresponding to one siphon occurrence; t2 represents the liquid level rise time corresponding to a specific occurrence within a unit of time; m represents the total number of siphon occurrences within a unit of time. This represents the average overall moisture content corresponding to one siphon occurrence; This represents the average overall moisture content corresponding to a single siphon occurrence within a unit of time. P1 represents the instantaneous moisture content collected during a single siphon occurrence within a unit of time, and n represents the number of instantaneous moisture contents collected during a single siphon occurrence within a unit of time.

[0110]

[0111] in, V represents the average liquid level rise time corresponding to one siphon occurrence; 虹吸 The volume of liquid corresponding to one siphon can be specifically calculated using the average liquid level rise time and the volume coefficient of the upper chamber 1. This represents the average overall moisture content corresponding to a single siphon event.

[0112] In the above embodiment 6, the liquid flow sensing unit 9 and the water cut measuring instrument 6 can also be executed simultaneously to obtain liquid flow sensing data and instantaneous water cut. The metering processing device determines the oil well production for the day based on the liquid flow sensing data output by the liquid flow sensing unit and the instantaneous water cut output by the water cut measuring instrument within a unit time. Thus, the oil well production is obtained by two methods, and the oil well production is comprehensively evaluated by the two measurement results, making the oil well production measurement more accurate.

[0113] In embodiments 5 and 6 above, the gas collection unit 7 can be further used to collect the gas flowing through the connecting pipe 5 and send it to the metering processing device to measure the gas production of the oil well, enriching the functions of the present invention and improving its utilization rate. Furthermore, the back-end transmission module can be used to transmit the oil well fluid production and oil well gas production to a remote location, effectively realizing communication between the front end and the remote location.

[0114] The above technical features constitute the preferred embodiment of the present invention, which has strong adaptability and optimal implementation effect. Unnecessary technical features can be added or removed according to actual needs to meet the requirements of different situations.

Claims

1. A method for measuring the production of an oil well using an oil well production metering device, characterized in that, The device includes a metering and acquisition device, comprising an upper chamber and a lower chamber. An enlarged-diameter pipe connected to the upper chamber is provided at the upper part of the upper chamber, and an output pipe connected to the lower chamber is provided at the bottom of the lower chamber. A siphon and a connecting pipe are provided between the upper and lower chambers. The inlet of the siphon is connected to the lower part of the upper chamber, and the outlet of the siphon is connected to the upper part of the lower chamber. The upper bend of the siphon is located at the upper part of the upper chamber. A water content measuring instrument is provided at the outlet of the siphon. A liquid flow sensing unit is provided on the pipe wall on one side of the siphon corresponding to the outlet. One end of the connecting pipe is connected to the upper chamber at a position higher than the upper bend of the siphon, and the other end of the connecting pipe is connected to the upper part of the lower chamber. The metering and processing device measures the daily oil well production based on the liquid flow sensing data output by the liquid flow sensing unit per unit time and the instantaneous water cut output by the water cut measuring instrument. The method includes: The gas-liquid mixture produced by the oil well undergoes preliminary gas-liquid separation through the pipeline expansion pipe and then enters the upper chamber for further gas-liquid separation. After gas-liquid separation, the gas accumulates in the upper part of the upper chamber, enters the lower chamber through the connecting pipe, and flows out together with the liquid in the lower chamber through the output pipeline. The liquid after gas-liquid separation accumulates at the bottom of the upper chamber, and the liquid level gradually rises. When the liquid level in the upper chamber exceeds the upper bend of the siphon tube, a siphon phenomenon occurs, and the liquid flows into the lower chamber through the siphon tube outlet. The liquid flow sensing unit and the water content measuring instrument acquire liquid flow sensing data and instantaneous water content. The gas in the lower chamber enters the upper chamber through the connecting pipe. When the liquid level in the upper chamber drops below the siphon tube inlet, the siphon phenomenon stops, and the liquid level begins to rise again until the siphon phenomenon occurs again, and the cycle repeats. The metering processing device determines the oil well production for the day based on the liquid flow sensing data output by the liquid flow sensing unit per unit time and the instantaneous water cut output by the water cut meter, including: The front-end transmission module communicates with the moisture content measuring instrument and the liquid flow sensing unit to obtain the liquid flow sensing data output by the liquid flow sensing unit and the instantaneous moisture content output by the moisture content measuring instrument per unit time. The metering and control module determines the number of siphoning events per unit time and the corresponding average comprehensive water cut per unit time, and calculates the daily oil well production V using the following formula. 油 : in, The unit of time is n; the number of siphon cycles occurring per unit of time is n. This represents the volume of liquid corresponding to one siphon. This represents the average overall moisture content per unit time. , denoted as instantaneous moisture content, and k is the instantaneous moisture content output by the moisture meter per unit time.

2. The oil well production measurement method of the oil well production measurement device according to claim 1, characterized in that, The metering processing device includes: The front-end transmission module communicates with the water content measuring instrument and the liquid flow sensing unit; The metering and control module determines the number of siphons per unit time and the corresponding average comprehensive water cut based on the liquid flow sensing data output by the liquid flow sensing unit and the instantaneous water cut output by the water cut meter, and measures the oil production of the well on that day.

3. The oil well production measurement method of the oil well production measurement device according to claim 1 or 2, characterized in that, It also includes an upper liquid level sensing unit and a lower liquid level sensing unit. The upper liquid level sensing unit is located inside or outside the upper chamber at the position corresponding to the upper bend of the siphon tube, and the lower liquid level sensing unit is located inside or outside the upper chamber at the position corresponding to the liquid inlet of the siphon tube.

4. The oil well production measurement method of the oil well production measurement device according to claim 3, characterized in that, The metering processing device also includes a timing module; The front-end transmission module communicates with the water content measuring instrument, the liquid flow sensing unit, the upper liquid level sensing unit, and the lower liquid level sensing unit. The timing module uses the initial liquid level data collected by the lower liquid level sensing unit at the siphon inlet as the start trigger condition and the initial liquid level data collected by the upper liquid level sensing unit at the upper bend of the siphon as the stop trigger condition to time the process and obtain the liquid level rise time corresponding to each siphon occurrence per unit time. The metering and control module determines the average liquid level rise time and average comprehensive water cut corresponding to each siphon occurrence per unit time, and measures the oil well production for the day.

5. The oil well production measurement method of the oil well production measurement device according to claim 2, characterized in that, The metering and processing device also includes a back-end transmission module for transmitting the oil well production volume to a remote location.

6. The oil well production measurement method of the oil well production measurement device according to claim 1, 2, 4, or 5, characterized in that, It also includes a gas acquisition unit and a gas measurement unit installed on the connecting pipe to measure the gas flowing through the connecting pipe.

7. The oil well production measurement method of the oil well production measurement device according to claim 1, characterized in that, It also includes upper and lower liquid level sensing units that collect liquid level data at corresponding locations. The metering and processing device uses the liquid level data to obtain the liquid level rise time corresponding to each siphon occurrence per unit time, and combines the liquid level rise time corresponding to each siphon occurrence with all instantaneous water cuts collected by the water cut measuring instrument to measure the oil well production, including: The liquid level data initially collected by the liquid level sensing unit at the siphon inlet is used as the start trigger condition, and the liquid level data initially collected by the liquid level sensing unit at the upper bend of the siphon is used as the stop trigger condition for timing. The timing module obtains the liquid level rise time corresponding to each siphon occurrence within a unit of time. The metering control module determines the average liquid level rise time and average comprehensive water cut corresponding to each siphon occurrence based on the liquid level rise time corresponding to each siphon occurrence per unit time and the instantaneous water cut collected by the water cut measuring instrument at each siphon occurrence, and then measures the oil well production.

8. The oil well production measurement method of the oil well production measurement device according to claim 7, characterized in that, The metering and control module determines the average liquid level rise time and average comprehensive water cut corresponding to each siphon occurrence based on the liquid level rise time and the instantaneous water cut collected by the water cut measuring instrument at each siphon occurrence per unit time, and measures the oil well production, including: Calculate the average liquid level rise time and average overall water content corresponding to one siphon occurrence; in, This represents the average liquid level rise time corresponding to one siphon occurrence. is the time it takes for the liquid level to rise during a single siphon occurrence per unit time; m is the total number of siphon occurrences per unit time. This represents the average overall moisture content corresponding to one siphon occurrence; This represents the average overall moisture content corresponding to a single siphon occurrence within a unit of time. , denoted as the instantaneous moisture content collected during a single siphon occurrence within a unit of time, and n represents the number of instantaneous moisture contents collected during a single siphon occurrence within a unit of time. Calculate the daily oil well production V 油 : in, This represents the average liquid level rise time corresponding to one siphon occurrence. This represents the volume of liquid corresponding to one siphon. This represents the average overall moisture content corresponding to a single siphon event.

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