Thickened oil steam injection system steam on-line monitoring device and on-line monitoring method thereof

Abstract

The invention relates to the technical field of thickened oil steam injection systems, in particular to an online steam monitoring device and method for a thickened oil steam injection system. Comprising a steam injection pipeline, a steam sampling port, a sampling steam valve, a sampling steam pipeline, a steam cooler, a condensate water outlet pipe, a cooling water inlet pipe, a cooling water outlet pipe, a first pressure transmitter, a first temperature transmitter, a second temperature transmitter, a third temperature transmitter, a fourth temperature transmitter, a first flow meter, a second flow meter and a database module. The system comprises a steam state judgment module, a heat absorption capacity calculation module, a humidity calculation module, a superheat degree calculation module, an information output module and a central control module. The device is reasonable in structure, online automatic monitoring of the quality of steam injected into a stratum in the heavy oil and super heavy oil recovery process is achieved, the manual sampling intensity is greatly reduced, and the risk that sampling personnel are scalded during manual sampling is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of heavy oil steam injection system, and is an online steam monitoring device and an online monitoring method for a heavy oil steam injection system. Background Art

[0002] With the exploitation of heavy oil and extra-heavy oil in the process of oil production, the requirements for the quality of steam injected into the formation are getting higher and higher. The steam quality at the steam wellhead is the key parameter for evaluating the quality of steam injected into the formation. The steam quality at the steam injection wellhead is particularly important. At present, there is no steam quality data acquisition and monitoring device at the heavy oil steam injection wellhead. The steam quality injected into the formation can only be estimated by the steam quality at the steam generator. Due to the long distance between the steam generator and the steam injection wellhead, the steam quality varies greatly, resulting in a large deviation in the estimated data. Summary of the invention

[0003] The present invention provides an online monitoring device and an online monitoring method for steam in a heavy oil steam injection system, which overcome the deficiencies of the above-mentioned prior art and can effectively solve the problem that the quality of steam injected into the formation cannot be monitored online during the existing heavy oil and super heavy oil production process.

[0004] One of the technical solutions of the present invention is achieved through the following measures: a steam online monitoring device for a heavy oil steam injection system, comprising a steam injection pipeline, a steam sampling port, a sampling steam valve, a sampling steam pipeline, a steam cooler, a condensate outlet pipe, a cooling water inlet pipe, a cooling water outlet pipe, a first pressure transmitter, a first temperature transmitter, a second temperature transmitter, a third temperature transmitter, a fourth temperature transmitter, a first flow meter, a second flow meter, a database module, a steam state judgment module, a heat absorption calculation module, a dryness and humidity calculation module, a superheat calculation module, an information output module and a central control module, the steam injection pipeline is provided with a first pressure transmitter, a first temperature transmitter and a steam sampling port, the steam sampling port is connected to a sampling steam pipeline, the sampling steam pipeline is provided with a sampling steam valve, the pipe inlet of the steam cooler is connected to the sampling steam pipeline, the steam cooler The tube side outlet is connected with the condensate outlet pipe, the condensate outlet pipe is provided with a second temperature transmitter and a first flow meter, the shell side inlet of the steam cooler is connected with the cooling water inlet pipe, the shell side outlet of the steam cooler is connected with the cooling water outlet pipe, the cooling water inlet pipe is provided with a third temperature transmitter and a second flow meter, and the cooling water outlet pipe is provided with a fourth temperature transmitter; the first pressure transmitter, the first temperature transmitter, the second temperature transmitter, the third temperature transmitter, the fourth temperature transmitter, the first flow meter, the second flow meter, the database module, the heat absorption calculation module, the dryness and humidity calculation module, the superheat calculation module, the steam state judgment module, and the information output module are all connected with the central control module, and the database module is used to provide the saturated pressure corresponding to the saturated steam at different temperatures, the saturated water specific enthalpy, the saturated steam specific enthalpy and the saturated temperature corresponding to the saturated steam at different pressures.

[0005] The following are further optimizations and / or improvements to the above invention:

[0006] The steam cooler may include a primary cooler and a secondary cooler which are sequentially connected together along the steam flow direction.

[0007] The primary cooler and the secondary cooler may both be spiral tube heat exchangers.

[0008] The above-mentioned steam injection pipeline may be provided with a steam sampling port at the front, middle and rear along the steam flow direction respectively, each steam sampling port is connected to a sampling steam pipeline, each sampling steam pipeline is provided with a sampling steam valve, and the three sampling steam pipelines on the three steam sampling ports are all connected to the pipe inlet of the steam cooler.

[0009] The above-mentioned sampling steam valve is a manual-automatic integrated valve.

[0010] The above-mentioned central control module can be a PLC controller.

[0011] The second technical solution of the present invention is achieved by the following measures: the online monitoring method of the steam online monitoring device of the heavy oil steam injection system comprises the following steps:

[0012] S1: The pressure P1 and temperature T1 of the steam in the gas injection pipeline are measured respectively by the first pressure transmitter and the first temperature transmitter, the temperature T2 and flow rate m2 of the condensed water formed by the steam condensed by the steam cooler are measured respectively by the second temperature transmitter and the first flow meter, the temperature T3 and flow rate m1 of the cooling water in the cooling water inlet pipe are measured respectively by the third temperature transmitter and the second flow meter, the temperature T4 of the cooling water in the cooling water outlet pipe is measured by the fourth temperature transmitter, and the measured data are sent to the central control module;

[0013] S2: The saturation temperature Tc corresponding to the saturated steam at the pressure P1 is obtained through the database module, and the temperature T1 and the temperature Tc are compared through the steam state judgment module; if T1<Tc, the steam is in an unsaturated state, and the steam state information is output through the information output module; if T1=Tc, the steam is in a saturated state, and the heat Q1 absorbed by the cooling water when the temperature rises from T3 to T4 is calculated through the heat absorption calculation module. The calculation formula of Q1 is:

[0014] Q1 = C*m1(T4-T3);

[0015] Where C is the specific heat capacity of cooling water. The saturated water specific enthalpy h1 and saturated steam specific enthalpy h2 corresponding to saturated steam at temperature T1 are obtained through the database module. The dryness x and humidity d of saturated steam are calculated through the dryness and humidity calculation module. The calculation formula for the dryness x of saturated steam is:

[0016]

[0017] The calculation formula of humidity d of saturated steam is:

[0018] d = 1-x;

[0019] The steam status information, the dryness x of saturated steam and the humidity d of saturated steam are output through the information output module; if T1>Tc, the steam is in a superheated state, and the steam superheat is calculated through the superheat calculation module. The steam superheat calculation formula is:

[0020] Steam superheat = T1-Tc;

[0021] The steam status information and steam superheat are output through the information output module.

[0022] The invention has a reasonable structure and realizes online monitoring of the quality of steam injected into the formation during the heavy oil and super-heavy oil production process, greatly reduces the intensity of manual sampling, and avoids the risk of scalding of sampling personnel when manually sampling. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Attached Figure 1 It is a structural schematic diagram of a steam online monitoring device for a heavy oil steam injection system in Embodiments 1 and 2 of the present invention.

[0024] Attached Figure 2 The circuit block diagram of the steam online monitoring device of the heavy oil steam injection system in the first and second embodiments of the present invention.

[0025] The codes in the accompanying drawings are: 1 is a steam injection pipeline, 2 is a steam sampling port, 3 is a sampling steam valve, 4 is a sampling steam pipeline, 5 is a condensate outlet pipe, 6 is a cooling water inlet pipe, 7 is a cooling water outlet pipe, 8 is a first pressure transmitter, 9 is a first temperature transmitter, 10 is a second temperature transmitter, 11 is a third temperature transmitter, 12 is a fourth temperature transmitter, 13 is a first flow meter, 14 is a second flow meter, 15 is a database module, 16 is a steam state judgment module, 17 is a heat absorption calculation module, 18 is a dryness and humidity calculation module, 19 is a superheat calculation module, 20 is an information output module, 21 is a central control module, 22 is a primary cooler, and 23 is a secondary cooler. DETAILED DESCRIPTION

[0026] The present invention is not limited by the following embodiments, and specific implementation methods can be determined based on the technical solution of the present invention and actual conditions.

[0027] In the present invention, for the convenience of description, the relative position relationship of each component is described according to the attached Figure 1 The positional relationships such as front, back, top, bottom, left, and right are described according to the layout directions of the drawings in the specification.

[0028] The present invention will be further described below in conjunction with embodiments and drawings:

[0029] Embodiment 1: As shown in the attached Figure 1-2As shown, the steam online monitoring device for the heavy oil steam injection system includes a steam injection pipeline 1, a steam sampling port 2, a sampling steam valve 3, a sampling steam pipeline 4, a steam cooler, a condensate outlet pipe 5, a cooling water inlet pipe 6, a cooling water outlet pipe 7, a first pressure transmitter 8, a first temperature transmitter 9, a second temperature transmitter 10, a third temperature transmitter 11, a fourth temperature transmitter 12, a first flow meter 13, a second flow meter 14, a database module 15, a steam state judgment module 16, a heat absorption calculation module 17, a dryness and humidity calculation module 18, a superheat calculation module 19, an information output module 20 and a central control module 21. The steam injection pipeline 1 is provided with a first pressure transmitter 8, a first temperature transmitter 9 and a steam sampling port 2, the steam sampling port 2 is connected to a sampling steam pipeline 4, the sampling steam pipeline 4 is provided with a sampling steam valve 3, the pipe side inlet of the steam cooler is connected to the sampling steam pipeline 4, and the pipe side outlet of the steam cooler is connected to the condensate outlet. The steam cooler is connected with a steam cooler shell side inlet 6, a steam cooler shell side outlet 7 is connected with a cooling water outlet pipe 7, a third temperature transmitter 11 and a second flow meter 14 are provided on the cooling water inlet pipe 6, and a fourth temperature transmitter 12 is provided on the cooling water outlet pipe 7; the first pressure transmitter 8, the first temperature transmitter 9, the second temperature transmitter 10, the third temperature transmitter 11, the fourth temperature transmitter 12, the first flow meter 13, the second flow meter 14, the database module 15, the heat absorption calculation module 17, the dryness and humidity calculation module 18, the superheat calculation module 19, the steam state judgment module 16, and the information output module 20 are all connected with the central control module 21, and the database module 15 is used to provide the saturated pressure, saturated water specific enthalpy, saturated steam specific enthalpy corresponding to the saturated steam at different temperatures and the saturated temperature corresponding to the saturated steam at different pressures.

[0030] According to requirements, the first pressure transmitter 8, the first temperature transmitter 9, the second temperature transmitter 10, the third temperature transmitter 11, the fourth temperature transmitter 12, the first flow meter 13, the second flow meter 14, the database module 15, the heat absorption calculation module 17, the dryness and humidity calculation module 18, the superheat calculation module 19, the steam state judgment module 16, the information output module 20 and the central control module 21 can all adopt existing well-known technologies. Specifically, in this embodiment, the information output module 20 is a display screen, and the central control module 21 is a PLC controller; the heat absorption calculation module 17 is used to calculate the heat absorbed by the cooling water after heat exchange with the steam, the dryness and humidity calculation module 18 is used to calculate the dryness and humidity of the saturated steam, the superheat calculation module 19 is used to calculate the superheat of the steam, the steam state judgment module 16 is used to judge the state of the steam, and the information output module 20 is used to output the state information of the steam, the dryness and humidity of the saturated steam and the superheat of the steam in the superheated state.

[0031] The above embodiments may be further optimized and / or improved according to actual needs:

[0032] As attached Figure 1 As shown, the steam cooler includes a primary cooler 22 and a secondary cooler 23 which are sequentially connected together along the steam flow direction. According to the requirements, the primary cooler 22 and the secondary cooler 23 are both spiral tube heat exchangers, and the high-temperature steam is cooled into unsaturated water through the primary cooler 22 and the secondary cooler 23.

[0033] As attached Figure 1 As shown, the steam injection pipeline 1 is provided with a steam sampling port 2 at the front, middle and rear along the steam flow direction, each steam sampling port 2 is connected to a sampling steam pipeline 4, each sampling steam pipeline 4 is provided with a sampling steam valve 3, and the three sampling steam pipelines 4 on the three steam sampling ports 2 are connected to the pipe inlet of the steam cooler. In this way, the sampling monitoring of the steam at the upper, middle and lower parts of the steam injection pipeline 1 is realized, making the steam quality data more accurate.

[0034] Specifically, the sampling steam valve 3 is a manual and automatic integrated valve, so the sampling steam valve 3 can be controlled manually or automatically.

[0035] Embodiment 2: As attached Figure 1-2 As shown, the online monitoring method of the steam online monitoring device of the heavy oil steam injection system comprises the following steps:

[0036] S1: The pressure P1 and temperature T1 of the steam in the gas injection pipeline are measured by the first pressure transmitter 8 and the first temperature transmitter 9 respectively, the temperature T2 and flow rate m2 of the condensed water formed by the steam condensed by the steam cooler are measured by the second temperature transmitter 10 and the first flow meter 13 respectively, the temperature T3 and flow rate m1 of the cooling water in the cooling water inlet pipe 6 are measured by the third temperature transmitter 11 and the second flow meter 14 respectively, the temperature T4 of the cooling water in the cooling water outlet pipe 7 is measured by the fourth temperature transmitter 12, and the measured data are sent to the central control module 21;

[0037] S2: The saturation temperature Tc corresponding to the saturated steam at the pressure P1 is obtained through the database module 15, and the temperature T1 and the temperature Tc are compared through the steam state judgment module 16; if T1<Tc, the steam is in an unsaturated state, and the steam state information is output through the information output module 20; if T1=Tc, the steam is in a saturated state, and the heat Q1 absorbed by the cooling water when the temperature rises from T3 to T4 is calculated through the heat absorption calculation module 17. The calculation formula of Q1 is:

[0038] Q1 = C*m1(T4-T3);

[0039] Where C is the specific heat capacity of cooling water. The saturated water specific enthalpy h1 and saturated steam specific enthalpy h2 corresponding to saturated steam at temperature T1 are obtained through the database module 15. The dryness x and humidity d of saturated steam are calculated through the dryness and humidity calculation module 18. The calculation formula of the dryness x of saturated steam is:

[0040]

[0041] The calculation formula for the humidity d of saturated steam is:

[0042] d = 1-x;

[0043] The steam state information, the dryness x of the saturated steam and the humidity d of the saturated steam are outputted through the information output module 20; if T1>Tc, the steam is in a superheated state, and the steam superheat is calculated through the superheat calculation module 19. The steam superheat calculation formula is:

[0044] Steam superheat = T1-Tc;

[0045] The steam state information and steam superheat are outputted through the information output module 20 .

[0046] This enables online monitoring of the quality of steam injected into the formation during heavy oil and extra-heavy oil production.

[0047] The above technical features constitute the best embodiment of the present invention, which has strong adaptability and best implementation effect. Non-essential technical features can be added or reduced according to actual needs to meet the requirements of different situations.

Claims

1. A steam online monitoring device for a heavy oil steam injection system, characterized in that It includes a steam injection pipeline, a steam sampling port, a sampling steam valve, a sampling steam pipeline, a steam cooler, a condensate outlet pipe, a cooling water inlet pipe, a cooling water outlet pipe, a first pressure transmitter, a first temperature transmitter, a second temperature transmitter, a third temperature transmitter, a fourth temperature transmitter, a first flow meter, a second flow meter, a database module, a steam state judgment module, a heat absorption calculation module, a dryness and humidity calculation module, a superheat calculation module, an information output module and a central control module. The steam injection pipeline is provided with a first pressure transmitter, a first temperature transmitter and a steam sampling port, the steam sampling port is connected with a sampling steam pipeline, the sampling steam pipeline is provided with a sampling steam valve, the pipe inlet of the steam cooler is connected with the sampling steam pipeline, the pipe outlet of the steam cooler is connected with the condensate outlet pipe, and the condensate outlet A second temperature transmitter and a first flow meter are provided on the outlet pipe, the shell inlet of the steam cooler is connected to the cooling water inlet pipe, the shell outlet of the steam cooler is connected to the cooling water outlet pipe, the cooling water inlet pipe is provided with a third temperature transmitter and a second flow meter, and the cooling water outlet pipe is provided with a fourth temperature transmitter; the first pressure transmitter, the first temperature transmitter, the second temperature transmitter, the third temperature transmitter, the fourth temperature transmitter, the first flow meter, the second flow meter, the database module, the heat absorption calculation module, the dryness and humidity calculation module, the superheat calculation module, the steam state judgment module, and the information output module are all connected to the central control module, and the database module is used to provide the saturated pressure corresponding to the saturated steam at different temperatures, the saturated water specific enthalpy, the saturated steam specific enthalpy and the saturated temperature corresponding to the saturated steam at different pressures.

2. The steam online monitoring device for the heavy oil steam injection system according to claim 1 is characterized in that The steam cooler comprises a primary cooler and a secondary cooler which are sequentially connected together along the steam flow direction.

3. The steam online monitoring device for the heavy oil steam injection system according to claim 2 is characterized in that The primary cooler and the secondary cooler are both spiral tube heat exchangers.

4. The steam online monitoring device for a heavy oil steam injection system according to claim 1, 2 or 3, characterized in that The steam injection pipeline is provided with a steam sampling port at the front, middle and rear parts along the steam flow direction respectively. Each steam sampling port is connected with a sampling steam pipeline. Each sampling steam pipeline is provided with a sampling steam valve. The three sampling steam pipelines on the three steam sampling ports are connected with the pipe inlet of the steam cooler.

5. The steam online monitoring device for a heavy oil steam injection system according to claim 1, 2 or 3, characterized in that The sampling steam valve is a manual-automatic integrated valve.

6. The steam online monitoring device for the heavy oil steam injection system according to claim 4 is characterized in that The sampling steam valve is a manual-automatic integrated valve.

7. The steam online monitoring device for a heavy oil steam injection system according to claim 1, 2, 3 or 6, characterized in that The central control module is a PLC controller.

8. The steam online monitoring device for the heavy oil steam injection system according to claim 4 is characterized in that The central control module is a PLC controller.

9. The steam online monitoring device for the heavy oil steam injection system according to claim 5, characterized in that The central control module is a PLC controller.

10. An online monitoring method for a steam online monitoring device for a heavy oil steam injection system according to any one of claims 1 to 9, characterized in that The following steps are involved: S1: The pressure P1 and temperature T1 of the steam in the gas injection pipeline are measured respectively by the first pressure transmitter and the first temperature transmitter, the temperature T2 and flow rate m2 of the condensed water formed by the steam condensed by the steam cooler are measured respectively by the second temperature transmitter and the first flow meter, the temperature T3 and flow rate m1 of the cooling water in the cooling water inlet pipe are measured respectively by the third temperature transmitter and the second flow meter, the temperature T4 of the cooling water in the cooling water outlet pipe is measured by the fourth temperature transmitter, and the measured data are sent to the central control module; S2: The saturation temperature Tc corresponding to the saturated steam at the pressure P1 is obtained through the database module, and the temperature T1 and the temperature Tc are compared through the steam state judgment module; if T1<Tc, the steam is in an unsaturated state, and the steam state information is output through the information output module; if T1=Tc, the steam is in a saturated state, and the heat Q1 absorbed by the cooling water when the temperature rises from T3 to T4 is calculated through the heat absorption calculation module. The calculation formula of Q1 is: Q1 = C*m1(T4-T3); Where C is the specific heat capacity of cooling water. The saturated water specific enthalpy h1 and saturated steam specific enthalpy h2 corresponding to saturated steam at temperature T1 are obtained through the database module. The dryness x and humidity d of saturated steam are calculated through the dryness and humidity calculation module. The calculation formula for the dryness x of saturated steam is: The calculation formula for the humidity d of saturated steam is: d11-x; The steam status information, the dryness x of saturated steam and the humidity d of saturated steam are output through the information output module; if T1>Tc, the steam is in a superheated state, and the steam superheat is calculated through the superheat calculation module. The steam superheat calculation formula is: Steam superheat = T1-Tc; The steam status information and steam superheat are output through the information output module.

Images