Manufacturing method of low-density foam cement for well cementation and matched remote monitoring equipment
By using supporting remote monitoring equipment in cementing oil fields for high-pressure, rapid and uniform mixing low-density foam cement production method, the problems of uneven mixing caused by large bubble diameters in the prior art are solved, and efficient and uniform foam cement slurry production is achieved, and the efficiency and compressive strength of cementing operations are improved.
Patent Information
- Application Number
- CN202311757175.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-20
- Publication Date
- 2025-06-27
AI Technical Summary
The bubble diameter in the existing low-density foam cement slurry is large, resulting in uneven mixing, narrow density adjustment range and low compressive strength after solidification, making it difficult to meet the high-pressure and efficient working environment of oilfield cementing.
It adopts supporting remote monitoring equipment, including control system, cement slurry pumping system, liquid nitrogen pumping system, foaming agent pumping system, mixing device and foaming device. By mixing bubbles and cement slurry at high pressure, fast and evenly, the density is accurately adjusted and efficient foaming is achieved.
It effectively increases the mixing uniformity between bubbles and cement slurry, reduces the density of foam cement slurry, improves the efficiency of making foam cement slurry on site, expands the density adjustment range, and improves the compressive strength after solidification.
Smart Images
Figure CN120206645A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of low-density foam cement slurry for well cementing, and particularly relates to a method for manufacturing well cementing low-density foam cement and a supporting remote monitoring device. Background Art
[0002] At present, there are various types of low-density cements used in oilfield well cementing operations. Generally, they can be divided into two types. One is to add light fillers such as expanded perlite, hard asphalt, hollow glass microspheres, and slag to the cement slurry to reduce the density of the cement slurry. The adjustable density range of this type of low-density cement slurry is 1.08 - 1.6 g / cm 3 , for formations with a formation pressure coefficient or fracture pressure less than 1.08, it often cannot meet the designed density conditions and cannot ensure safe drilling; the other is foam cement slurry prepared by mechanical foaming or chemical foaming methods, and its adjustable density range is 0.8 - 1.8 g / cm 3 , and there is data indicating that the lowest density of foam cement can now reach 0.42 g / cm 3 , for oil and gas wells using near-balanced well cementing construction, this ultra-low density foam cement has good effects of preventing leakage and gas channeling.
[0003] Therefore, there are generally two existing methods for manufacturing foam cement slurry, namely chemical foaming method and mechanical foaming method. Among them, the chemical foaming method is to incorporate a certain amount of chemical foaming agent into dry cement. When the cement and water are mixed and stirred, the foaming agent reacts with some chemical components in the cement to generate gas, which is distributed in the cement slurry to form foam cement. However, the gas generation amount of the chemical foaming method is small. When the wellbore fluid column pressure exceeds 10.0 MPa, it is very difficult to significantly adjust the density of the downhole foam cement slurry in this way; secondly, the mechanical foaming method refers to adding a foaming agent and a foam stabilizer to ordinary cement slurry, and then filling gas through mechanical stirring to generate foam in the cement slurry to achieve the purpose of reducing the density of the cement slurry. The foamed cement slurry formed by the mechanical foaming method has large foam diameters, uneven mixing, and low strength after solidification. It is mostly used in fields such as building insulation and filling, and usually requires a long time of mixing to reduce the density of the cement slurry, with low operation efficiency and difficult to meet the high-pressure and high-efficiency working environment of oilfield well cementing. Therefore, in view of the above deficiencies, a method for manufacturing well cementing low-density foam cement and a supporting remote monitoring device are proposed. Summary of the Invention
[0004] (I) Technical Problems to be Solved The present invention provides a method for manufacturing well cementing low-density foam cement and a supporting remote monitoring device to overcome the problems in the prior art such as large bubble diameters in the low-density foam cement slurry, resulting in uneven mixing, and further leading to a narrow adjustable density range and low compressive strength after solidification.
[0005] (2) Technical Solution To solve the above problems, the present invention provides a supporting remote monitoring device for low-density foam cement in well cementing, including: a control system, a cement slurry pumping system, a liquid nitrogen pumping system, a foaming agent pumping system, a mixing device and a foaming device. The control system is respectively connected to the cement slurry pumping system, the foaming device and the liquid nitrogen pumping system through pipelines. The cement slurry pumping system is connected to the mixing device through a pipeline. The mixing device is connected to the foaming agent pumping system and the foaming device. The foaming device is connected to the cement head and the liquid nitrogen pumping system through pipelines. The cement slurry pumping system is connected to the cement head through a pressure relief tee.
[0006] Preferably, the cement pumping system includes a well cementing truck, which is connected to a cement slurry pipeline. The cement slurry pipeline is sequentially connected to a cement slurry densitometer, a cement slurry flowmeter and a bypass tee. One side of the bypass tee is sequentially connected to a cement slurry cock valve and a cement slurry check valve. The upper side of the bypass tee is connected to a pressure relief tee, which is connected to a return tee. The return tee is connected to the cement head through a cement head tee. The cement slurry check valve is connected to the mixing device.
[0007] Preferably, the control system includes a control center, a monitoring loop for the foaming agent pumping system, a monitoring loop for the well cementing truck, a monitoring loop for the cement slurry density, a monitoring loop for the cement slurry flow, a monitoring loop for the liquid nitrogen pumping system and a monitoring loop for the foam cement slurry. The control center is connected to the foaming agent pumping system through the monitoring loop for the foaming agent pumping system. The control center is connected to the well cementing truck through the monitoring loop for the well cementing truck. The control center is connected to the cement slurry densitometer through the monitoring loop for the cement slurry density. The control center is connected to the liquid nitrogen pumping system through the monitoring loop for the liquid nitrogen pumping system. The control center is connected to the foaming device and the foam cement slurry densitometer through the monitoring loop for the foam cement slurry.
[0008] Preferably, the foaming agent pumping system includes a foaming liquid tank, which is connected to a foaming liquid pump. The foaming liquid pump is sequentially connected to a foaming liquid flowmeter, a foaming liquid cock valve and a foaming liquid check valve. The foaming liquid check valve is connected to the mixing device. The foaming liquid tank and the foaming liquid flowmeter are connected to the control center through the monitoring loop for the foaming agent pumping system.
[0009] Preferably, the liquid nitrogen pumping system includes a liquid nitrogen pump, which is connected to a liquid nitrogen evaporator. The liquid nitrogen evaporator is connected to a nitrogen pressure sensor. The nitrogen pressure sensor is sequentially connected to a nitrogen flowmeter, a nitrogen thermometer, and a nitrogen check valve. The nitrogen check valve is sequentially connected to a nitrogen safety valve and a nitrogen stopcock valve. The liquid nitrogen pump, the nitrogen pressure sensor, the nitrogen flowmeter, and the nitrogen thermometer are connected to a control center through a monitoring loop of the liquid nitrogen pumping system. The nitrogen stopcock valve is connected to a foaming device.
[0010] Preferably, the foaming device is connected to a foam cement slurry densitometer through a pipeline, and the foam cement slurry densitometer is connected to a loop tee.
[0011] The present invention provides a method for manufacturing low-density foam cement for cementing based on a supporting remote monitoring device, including: Step S1: Start the equipment, perform self-check on each component in the equipment through the control system, and preset various process parameters through the control system; Step S2: According to the process parameters input by the control system in Step S1, the cement slurry pumping system conveys cement slurry to the mixing device, and the foaming agent pumping system conveys a foaming agent to the mixing device. The mixing device obtains a mixed liquid by mixing the cement slurry and the foaming agent; Step S3: The mixing device conveys the mixed liquid obtained in Step S2 to the foaming device, and the liquid nitrogen pumping system conveys nitrogen to the foaming device. The foaming device obtains foam cement slurry by mixing and foaming the mixed liquid and nitrogen; Step S4: The foaming device conveys the foam cement slurry obtained in Step S3 to the cement head at the wellhead, and the foam cement slurry enters the wellbore to continue the cementing operation.
[0012] Preferably, the control system monitors the real-time displacement and real-time density during the conveying process of the cement slurry pumping system, monitors the real-time displacement and real-time temperature during the conveying process of the foaming agent pumping system, monitors the real-time temperature, real-time pressure, and real-time displacement during the conveying process of the liquid nitrogen pumping system, and monitors the real-time density and real-time displacement during the conveying process of the foaming device.
[0013] Preferably, in Step S1, the process parameters include the initial displacement of the cement slurry, the initial displacement of the foaming agent, the initial displacement of nitrogen, and the preset density of the foam cement slurry.
[0014] (III) Beneficial effects The method for manufacturing low-density foam cement for cementing and the supporting remote monitoring device provided by the present invention have stable equipment performance and strong method reliability. They effectively increase the mixing uniformity of bubbles and cement slurry, reduce the density of the foam cement slurry, achieve high-pressure, fast, and uniform mixing of foam and cement slurry, and improve the efficiency of manufacturing foam cement slurry on the cementing site. Brief Description of the Drawings
[0015] Figure 1 It is a system diagram of the supporting remote monitoring device for the low-density foam cement in the cementing operation of the embodiment of the present invention; Figure 2 It is a schematic structural diagram of the supporting remote monitoring device for the low-density foam cement in the cementing operation of the embodiment of the present invention; Figure 3 It is a control flow chart of the control system in the embodiment of the present invention.
[0016] Legend Explanation: 1 - Cementing cement truck; 2 - Cement slurry pipeline; 3 - Cement slurry densitometer; 4 - Cement slurry flowmeter; 5 - Bypass tee; 6 - Cement slurry stopcock valve; 7 - Cement slurry check valve; 8 - Mixing device; 9 - Foaming liquid tank; 10 - Foaming liquid pump; 11 - Foaming liquid flowmeter; 12 - Foaming liquid stopcock valve; 13 - Foaming liquid check valve; 14 - Liquid nitrogen pump; 15 - Liquid nitrogen evaporator; 16 - Nitrogen pressure sensor; 17 - Nitrogen flowmeter; 18 - Nitrogen thermometer; 19 - Nitrogen check valve; 20 - Nitrogen safety valve; 21 - Nitrogen stopcock valve; 22 - Foaming device; 23 - Foamed cement slurry pressure gauge; 24 - Foamed cement slurry densitometer; 25 - Pressure relief tee; 26 - Return tee; 27 - Cement head tee; 28 - Cement head; 29 - Control system; 30 - Cement slurry pumping system; 31 - Foaming agent pumping system; 32 - Liquid nitrogen pumping system; 101 - Control center; 102 - Monitoring loop of foaming agent pumping system; 103 - Monitoring loop of cementing cement truck; 104 - Cement slurry density monitoring loop; 105 - Cement slurry flow monitoring loop; 106 - Monitoring loop of liquid nitrogen pumping system; 107 - Foamed cement slurry monitoring loop. Embodiment
[0017] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts shall fall within the protection scope of the present invention.
[0018] Figure 1 It is a system diagram of the supporting remote monitoring device for the low-density foam cement in the cementing operation of the embodiment of the present invention. As Figure 1 shown, the present invention proposes a supporting remote monitoring device for low-density foam cement in cementing, specifically including: A control system 29, a cement slurry pumping system 30, a liquid nitrogen pumping system 32, a foaming agent pumping system 31, a mixing device 8 and a foaming device 22. The control system 29 is connected to the cement slurry pumping system 30 and the liquid nitrogen pumping system 32 through pipelines respectively. The cement slurry pumping system 30 is connected to the mixing device 8. The mixing device 8 is connected to the foaming agent pumping system 31 and the foaming device 22. The foaming device 22 is connected to the cement head 28 and the liquid nitrogen pumping system 32. The cement slurry pumping system 30 is connected to the cement head 28.
[0019] In this equipment, the cement slurry pumping system 30 is used for the storage and pumping of cement slurry. The cement pumping system 30 includes a cementing cement truck 1. The cementing cement truck 1 is connected to a cement slurry pipeline 2. The cement slurry pipeline 2 is sequentially connected to a cement slurry densitometer 3, a cement slurry flowmeter 4 and a bypass tee 5. One side of the bypass tee 5 is sequentially connected to a cement slurry plug valve 6 and a cement slurry check valve 7. The upper side of the bypass tee 8 is connected to a pressure relief tee 25. The pressure relief tee 25 is connected to a return tee 26. The return tee 26 is connected to the cement head 28 through a cement head tee 27. The cement slurry check valve 7 is connected to the mixing device 8.
[0020] In practical applications, the control system 29 includes a control center 101, a foaming agent pumping system monitoring loop 102, a cementing cement truck monitoring loop 103, a cement slurry density monitoring loop 104, a cement slurry flow monitoring loop 105, a liquid nitrogen pumping system monitoring loop 106 and a foam cement slurry monitoring loop 107. The control center 101 is connected to the foaming agent pumping system 31 through the foaming agent pumping system monitoring loop 102. The control center 101 is connected to the cementing cement truck 1 through the cementing cement truck monitoring loop 103. The control center 101 is connected to the cement slurry densitometer 3 through the cement slurry density monitoring loop 104. The control center 101 is connected to the liquid nitrogen pumping system 32 through the liquid nitrogen pumping system monitoring loop 105. The control center 101 is connected to the foaming device 22 and a foam cement slurry densitometer 24 through the foam cement slurry monitoring loop 107.
[0021] In this equipment, the foaming agent pumping system 31 includes a foaming liquid tank 9. The foaming liquid tank 9 is connected to a foaming liquid pump 10. The foaming liquid pump 10 is sequentially connected to a foaming liquid flowmeter 11, a foaming liquid plug valve 12 and a foaming liquid check valve 13. The foaming liquid check valve 13 is connected to the mixing device 8. The foaming liquid tank 9 and the foaming liquid flowmeter 11 are connected to the control center 101 through the foaming agent pumping system monitoring loop 102.
[0022] In practical applications, the liquid nitrogen pumping system 32 includes a liquid nitrogen pump 14. The liquid nitrogen tank is connected to the liquid nitrogen pump 14 through a cryogenic-resistant stainless steel high-pressure pipeline. The liquid nitrogen pump 14 is connected to a liquid nitrogen evaporator 15. The liquid nitrogen evaporator 15 is connected to a nitrogen pressure sensor 16. The nitrogen pressure sensor 16 is sequentially connected to a nitrogen flowmeter 17, a nitrogen thermometer 18, and a nitrogen check valve 19. The nitrogen check valve 19 is sequentially connected to a nitrogen safety valve 20 and a nitrogen stopcock 21. The liquid nitrogen pump 14, the nitrogen pressure sensor 16, the nitrogen flowmeter 17, and the nitrogen thermometer 18 are connected to the control center 101 through the liquid nitrogen pumping system monitoring loop 106. The nitrogen stopcock 21 is connected to a foaming device 22.
[0023] In addition, the foaming device 22 is connected to a foam cement slurry densitometer 24 through a pipeline. The foam cement slurry densitometer 24 is connected to a loop tee 26. In practical applications, the mixing device 8 is used to mix the foaming agent and the cement slurry. The foaming device 22 is used to foam nitrogen with the mixed foaming agent and cement slurry. The foam cement slurry densitometer 24 is used to monitor the foam cement slurry. The foam cement slurry densitometer 24 is a radioactive densitometer.
[0024] The present invention provides a method for manufacturing low-density foam cement for well cementing based on a supporting remote monitoring device, including: Step S1: Start the equipment, perform self-check on each component in the equipment through the control system, and preset various process parameters through the control system.
[0025] Step S2: According to the process parameters input by the control system in Step S1, the cement slurry pumping system conveys the cement slurry to the mixing device, the foaming agent pumping system conveys the foaming agent to the mixing device, and the mixing device obtains a mixed liquid by mixing the cement slurry and the foaming agent; Step S3: The mixing device conveys the mixed liquid obtained in Step S2 to the foaming device, the liquid nitrogen pumping system conveys nitrogen to the foaming device, and the foaming device obtains foam cement slurry by mixing and foaming the mixed liquid and nitrogen; Step S4: The foaming device conveys the foam cement slurry obtained in Step S3 to the cement head at the wellhead, and the foam cement slurry enters the wellbore to continue the well cementing operation.
[0026] In this method, the control system 29 monitors the real-time displacement and real-time density during the conveying process of the cement slurry pumping system 30, the control system 29 monitors the real-time displacement and real-time temperature during the conveying process of the foaming agent pumping system 31, the control system 29 monitors the real-time temperature, real-time pressure, and real-time displacement during the conveying process of the liquid nitrogen pumping system 32, and the control system 29 monitors the real-time density and real-time displacement during the conveying process of the foaming device 22.
[0027] In practical applications, in step S1, the process parameters include the initial displacement of cement slurry, the initial displacement of foaming agent, the initial displacement of nitrogen, and the preset density of foam cement slurry.
[0028] It should be noted that the control center 101 is equipped with a man-machine interface, a control program, a matching calculation program for three-phase fluid and foam cement slurry, a data storage device, a data sending terminal, a remote data receiving terminal, etc. The control system 29 has three modes: manual mode, automatic mode, and remote mode. When the control system 29 is started, the mode can be selected on the software startup interface. Among them, in the manual mode, parameters need to be adjusted manually in real time on the man-machine interface. In the automatic mode, the system can automatically adjust according to the pre-imported parameters. In the remote mode, the system is connected to the background data terminal through Ethernet, and technicians can remotely monitor, operate, and store data of the system.
[0029] Figure 3 This is the control flow chart of the control system in the embodiment of the present invention. As Figure 3 shown, after the engine is started, the control system 29 is powered on. The control system 29 starts and conducts self-checks on various components in the system. The self-check mode includes a self-check program and a display terminal. The self-check program includes an alarm program and a fault program. The display terminal includes an alarm display and a fault display. If a certain component is abnormal, an alarm will be given on the display terminal during the self-check process; after the self-check passes, it enters the mode selection interface of the control system 29, where the manual mode, automatic mode, and remote mode can be selected; after selecting the corresponding system mode, it automatically enters the main operation interface of the control system. This interface includes a parameter setting program, a communication program, a power system control program, a hydraulic system control program, a mixed foaming control program, and a data processing program. Operate the corresponding programs according to the operation process to complete the control of the corresponding components; after the operation is completed, record, process, and store various data, and print the operation curve.
[0030] It should be noted that the mixed foaming control program conducts the foaming operation of low-density foam cement slurry. The mixed foaming control program includes a base slurry pumping control program, a liquid nitrogen evaporation pumping program, a heat exchange control program, and a foaming liquid pumping control program. Each program adjusts the parameters of each component in the foaming mixing operation respectively.
[0031] The method for making low-density foam cement for cementing and the supporting remote monitoring equipment provided by the present invention have stable equipment performance and strong method reliability, effectively increasing the mixing uniformity of bubbles and cement slurry, reducing the density of foam cement slurry, realizing the high-pressure, fast, and uniform mixing of foam and cement slurry, and improving the efficiency of making foam cement slurry on the cementing site.
[0032] In practical applications, the production process of low-density foam cement slurry for well cementing is to transport the foaming gas, foaming agent, and cement slurry into the high-pressure pipeline. By regulating the pressure, temperature, and displacement of the foaming gas, foaming agent, and cement slurry, the three-phase fluid composed of gas, water, and cement particles is mixed and foamed in a certain proportion. At the same time, the density and displacement of the mixed foam cement slurry are monitored, and the input parameters of these three-phase fluids are adjusted according to the monitoring data to form a closed-loop control, so as to achieve the adjustment of the density of the foam cement slurry. Figure 2 The following is a schematic structural diagram of the supporting remote monitoring equipment for low-density foam cement for well cementing in the embodiment of the present invention, as Figure 2 shown. The working principle of this supporting remote monitoring equipment for low-density foam cement for well cementing will be specifically described below: In this embodiment, the well cementing truck 1 is connected to the cement slurry pipeline 2. The cement slurry pipeline is a high-pressure manifold. The cement slurry pipeline 2 is successively connected to the cement slurry densitometer 3, the cement slurry flowmeter 4, and the bypass tee 5. The control center 101 is connected to the well cementing truck 1 through the well cementing truck monitoring loop 103. The control center 101 is connected to the cement slurry densitometer 3 through the cement slurry density monitoring loop 104. One side of the bypass tee 5 is successively connected to the cement slurry stop valve 6 and the cement slurry check valve 7. The upper side of the bypass tee 8 is connected to the pressure relief tee 25. The pressure relief tee 25 is connected to the loop tee 26. The loop tee 26 is connected to the cement head 28 through the cement head tee 27. The cement slurry check valve 7 is connected to the mixing device 8. The foaming liquid tank 9 is connected to the foaming liquid pump 10. The foaming liquid pump 10 is successively connected to the foaming liquid flowmeter 11, the foaming liquid stop valve 12, and the foaming liquid check valve 13 through the high-pressure manifold. The foaming liquid check valve 13 is connected to the mixing device 8. The foaming liquid tank 9 and the foaming liquid flowmeter 11 are connected to the control center 101 through the foaming agent pumping system monitoring loop 102. The liquid nitrogen tank is connected to the liquid nitrogen pump 14 through a cryogenic stainless steel high-pressure manifold. The liquid nitrogen pump 14 is connected to the liquid nitrogen evaporator 15. The liquid nitrogen evaporator 15 is connected to the nitrogen pressure sensor 16. The nitrogen pressure sensor 16 is successively connected to the nitrogen flowmeter 17, the nitrogen thermometer 18, and the nitrogen check valve 19 through the high-pressure manifold. The nitrogen check valve 19 is successively connected to the nitrogen safety valve 20 and the nitrogen stop valve 21 through the high-pressure manifold. The liquid nitrogen pump 14, the nitrogen pressure sensor 16, the nitrogen flowmeter 17, and the nitrogen thermometer 18 are connected to the control center 101 through the liquid nitrogen pumping system monitoring loop 106. The nitrogen stop valve 21 is connected to the foaming device 22. The foaming device 22 is connected to the foam cement slurry densitometer 24 through a pipeline. The foam cement slurry densitometer 24 is connected to the loop tee 26.
[0033] In practical applications, the operation steps of the specific production method of low-density foam cement for well cementing are as follows: Step 1: Start the equipment, perform self-check on each component in the equipment through the control system, and preset various process parameters through the control system.
[0034] In this embodiment, the control system 29 is started, and the preset density of the foam cement slurry and the corresponding displacement of the cement slurry, nitrogen, and foaming agent are input into the control system 29.
[0035] Step 2: According to the process parameters input by the control system, the cement slurry pumping system conveys the cement slurry to the mixing device, the foaming agent pumping system conveys the foaming agent to the mixing device, and the mixing device obtains a mixed liquid by mixing the cement slurry and the foaming agent.
[0036] In this embodiment, the cementing cement truck 1 controls the cement slurry pump to convey the cement slurry to the mixing device 8 according to the preset cement slurry displacement value of the control system, and feeds back the real-time displacement and density of the output cement slurry to the control system 29 through the cement slurry flowmeter 3 and the cement slurry densitometer; the foaming agent in the foaming liquid tank 9 is poured into the foaming liquid pump 10, and the foaming liquid pumps the foaming agent into the mixing device 8 according to the preset parameters of the foaming agent, and feeds back the parameters of the foaming agent to the control system 29 through the flowmeter and thermometer installed in the pipeline.
[0037] Step 3: The mixing device conveys the obtained mixed liquid to the foaming device, the liquid nitrogen pumping system conveys nitrogen to the foaming device, and the foaming device obtains the foam cement slurry by mixing and foaming the mixed liquid and nitrogen.
[0038] In this embodiment, the cement slurry pumped from the cementing cement truck 1 and the foaming agent pumped by the foaming agent pumping system 31 are pre-mixed in the mixing device 8 and then pumped to the foaming device 22. At the same time, the liquid nitrogen in the liquid nitrogen tank is poured into the liquid nitrogen pump 14, and the liquid nitrogen pump 14 conveys the liquid nitrogen to the liquid nitrogen evaporator 15 according to the preset parameters of nitrogen in the system. The liquid nitrogen is heated and converted into normal-temperature nitrogen in the liquid nitrogen evaporator 15 and then conveyed to the foaming device 22. The parameters of the liquid nitrogen and nitrogen are fed back to the control system 29 through the thermometer, flowmeter, and pressure gauge installed on the pipeline.
[0039] It should be noted that when the foam cement slurry is not required for the cementing operation, the bypass tee 5 can be switched to be directly connected to the cement head 28, and the cement slurry can directly enter the cement head through the bypass tee 25.
[0040] Step 4: The foaming device conveys the obtained foam cement slurry to the cement head at the wellhead, and the foam cement slurry enters the wellbore to continue the cementing operation.
[0041] In this embodiment, the mixture of nitrogen, cement slurry, and foaming agent is mixed and foamed in the foaming device 22 to form the foam cement slurry, which is conveyed to the cement head 28 at the wellhead through the pipeline and enters the wellbore to participate in the cementing operation.
[0042] Among them, the radioactive densitometer and flowmeter between the foaming device 22 and the cement head 28 can monitor the real-time density and flow rate of the foam cement slurry, and feed the data back to the control system 29. The control system 29 analyzes and compares the various parameters collected by each subsystem, and centrally controls and adjusts each subsystem according to the various initial data preset in the program, so that the density, flow rate, etc. of the foam cement slurry output from the foaming device 22 reach the preset values.
[0043] The method for manufacturing the low-density foam cement for well cementing and the supporting remote monitoring equipment provided by the present invention achieve high-pressure, fast, and uniform mixing of foam and cement slurry, improving the efficiency of manufacturing foam cement slurry at the well cementing site; effectively refining the bubble diameter in the low-density foam cement slurry and increasing the mixing uniformity of the bubbles and the cement slurry; realizing closed-loop automatic control, reducing the density of the foam cement slurry, and expanding the density adjustment range of the low-density cement slurry; the formed low-density foam cement slurry has good leak prevention and gas channeling prevention effects in the wellbore, and has good compressive strength after solidification, and can be applied to near-balanced well cementing operations, expanding the application range of low-density cement slurry in well cementing engineering.
[0044] The above embodiments are only used to illustrate the present invention and are not intended to limit the present invention. Those of ordinary skill in the relevant technical fields can also make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions also belong to the scope of the present invention, and the patent protection scope of the present invention shall be defined by the claims.
Claims
1. A supporting remote monitoring device for low-density foam cement in well cementing, characterized in that, Including: A control system (29), a cement slurry pumping system (30), a liquid nitrogen pumping system (32), a foaming agent pumping system (31), a mixing device (8) and a foaming device (22). The control system (29) is respectively connected to the cement slurry pumping system (30), the foaming device (22) and the liquid nitrogen pumping system (32) through pipelines. The cement slurry pumping system (30) is connected to the mixing device (8) through a pipeline. The mixing device (8) is connected to the foaming agent pumping system (31) and the foaming device (22). The foaming device (22) is connected to the cement head (28) and the liquid nitrogen pumping system (32) through pipelines. The cement slurry pumping system (30) is connected to the cement head (28) through a pressure relief tee (25).
2. The remote monitoring device supporting the low-density foam cement for well cementing according to claim 1, characterized in that In the step S1, the cement pumping system (30) includes a cementing cement truck (1). The cementing cement truck (1) is connected to a cement slurry pipeline (2). The cement slurry pipeline (2) is successively connected to a cement slurry densitometer (3), a cement slurry flowmeter (4) and a bypass tee (5). One side of the bypass tee (5) is successively connected to a cement slurry plug valve (6) and a cement slurry check valve (7). The upper side of the bypass tee (5) is connected to a pressure relief tee (25). The pressure relief tee (25) is connected to a return tee (26). The return tee (26) is connected to the cement head (28) through a cement head tee (27). The cement slurry check valve (7) is connected to the mixing device (8).
3. The remote monitoring device supporting the low-density foam cement for well cementing according to claim 2, wherein The control system (29) includes a control center (101), a foaming agent pumping system monitoring loop (102), a cementing cement truck monitoring loop (103), a cement slurry density monitoring loop (104), a cement slurry flow monitoring loop (105), a liquid nitrogen pumping system monitoring loop (106) and a foamed cement slurry monitoring loop (107). The control center (101) is connected to the foaming agent pumping system (31) through the foaming agent pumping system monitoring loop (102). The control center (101) is connected to the cementing cement truck (1) through the cementing cement truck monitoring loop (103). The control center (1) is connected to the cement slurry densitometer (3) through the cement slurry density monitoring loop (104). The control center (101) is connected to the cement slurry flowmeter (4) through the cement slurry flow monitoring loop (105). The control center (101) is connected to the liquid nitrogen pumping system (32) through the liquid nitrogen pumping system monitoring loop (106). The control center (101) is connected to the foaming device (22) and a foamed cement slurry densitometer (24) through the foamed cement slurry monitoring loop (107).
4. The remote monitoring device for the low-density foam cement used in well cementing according to claim 3, characterized in that, The foaming agent pumping system (32) includes a foaming liquid tank (9). The foaming liquid tank (9) is connected to a foaming liquid pump (10). The foaming liquid pump (10) is successively connected to a foaming liquid flowmeter (11), a foaming liquid plug valve (12) and a foaming liquid check valve (13). The foaming liquid check valve (13) is connected to the mixing device (8). The foaming liquid tank (9) and the foaming liquid flowmeter (11) are connected to the control center (101) through the foaming agent pumping system monitoring loop (102).
5. The remote monitoring device for the low-density foam cement used in well cementing according to claim 3, characterized in that, The liquid nitrogen pumping system (32) includes a liquid nitrogen pump (14), the liquid nitrogen pump (14) is connected to a liquid nitrogen evaporator (15), the liquid nitrogen evaporator (15) is connected to a nitrogen pressure sensor (16), the nitrogen pressure sensor (16) is sequentially connected to a nitrogen flowmeter (17), a nitrogen thermometer (18) and a nitrogen check valve (19), the nitrogen check valve (19) is sequentially connected to a nitrogen safety valve (20) and a nitrogen stopcock valve (21), the liquid nitrogen pump (14), the nitrogen pressure sensor (16), the nitrogen flowmeter (17) and the nitrogen thermometer (18) are connected to a control center (101) through a liquid nitrogen pumping system monitoring loop (106), and the nitrogen stopcock valve (21) is connected to a foaming device (22).
6. The remote monitoring device for the low-density foam cement used in well cementing according to claim 3, characterized in that, The foaming device (22) is connected to a foam cement slurry densitometer (24) through a pipeline, and the foam cement slurry densitometer (24) is connected to a loop tee (26).
7. A method for manufacturing a low-density foam cement for well cementing supporting a remote monitoring device proposed based on any one of claims 1 to 6, characterized in that, Comprising: Step S1: Start the equipment, perform self-check on each component in the equipment through the control system, and preset various process parameters through the control system; Step S2: According to the process parameters input by the control system in Step S1, the cement slurry pumping system conveys cement slurry to the mixing device, the foaming agent pumping system conveys a foaming agent to the mixing device, and the mixing device obtains a mixed liquid by mixing the cement slurry and the foaming agent; Step S3: The mixing device conveys the mixed liquid obtained in Step S2 to the foaming device, the liquid nitrogen pumping system conveys nitrogen to the foaming device, and the foaming device obtains foam cement slurry by mixing and foaming the mixed liquid and nitrogen; Step S4: The foaming device conveys the foam cement slurry obtained in Step S3 to the cement head at the wellhead, and the foam cement slurry enters the wellbore to continue the cementing operation.
8. The method for manufacturing a low-density foam cement for well cementing according to claim 7, characterized in that, The control system (29) monitors the real-time displacement and real-time density during the conveying process of the cement slurry pumping system (30), the control system (29) monitors the real-time displacement and real-time temperature during the conveying process of the foaming agent pumping system (31), the control system (29) monitors the real-time temperature, real-time pressure and real-time displacement during the conveying process of the liquid nitrogen pumping system (32), and the control system (29) monitors the real-time density and real-time displacement during the conveying process of the foaming device (22).
9. The method for manufacturing low-density foam cement for well cementing according to claim 7, characterized in that, In Step S1, the process parameters include the initial displacement of the cement slurry, the initial displacement of the foaming agent, the initial displacement of the nitrogen, and the preset density of the foam cement slurry.