A SAGD wellhead injection-production integrated pipeline system

Abstract

The utility model discloses a kind of SAGD wellhead injection collection integrated pipeline systems, including high-low pressure pipeline system and associated equipment, high-low pressure pipeline system includes high-pressure steam injection pipeline and low pressure pipeline respectively connected I well and P well, associated equipment includes I pump, P pump, No. 1 water tank, No. 2 water tank and centrifugal pump;Low pressure production / well flushing pipeline is compatible with well flushing fluid transport and production fluid collection function, design pressure meets the requirement of circulating well flushing operation.

Description

Technical Field

[0001] This utility model relates to the application of a wellhead injection and production process manifold system in a SAGD (Steam Assisted Gravity Drainage) well site in a Class III heavy oil extraction project. Background Technology

[0002] SAGD (Super Aqueous Gas Diversion) oil production is complex, requiring continuous steam injection and oil production, as well as regular wellbore maintenance and production enhancement measures. During the production phase, when problems arise in the SAGD circulation preheating stage or production wells, temporary injection-production channels need to be established to inject hot water or low-dryness steam and collect the returned fluid. In the well-washing phase, to remove asphalt, wax, and mechanical impurities near the wellbore and screen, thermochemical agents or hot water need to be injected, and the waste fluid from the well-washing phase needs to be safely collected. In the fracturing phase, for certain reservoirs, fracturing is required to improve drainage capacity; this process necessitates a rapid, high-volume, high-pressure fluid supply. Traditional single-function pipeline systems involve repeated construction and dismantling, leading to low efficiency, high costs, large footprint, and safety risks. Therefore, an integrated, multi-functional temporary pipeline network needs to be designed to enable rapid switching and efficient operation. Utility Model Content

[0003] The purpose of this invention is to provide a SAGD wellhead injection and production pipeline device to achieve integrated connection of pipelines between SAGD wellhead injection and production related equipment, simplify the installation process, facilitate centralized monitoring and control of injection and production process parameters, and improve the efficiency and safety of SAGD mining.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a SAGD wellhead injection and collection pipeline system, comprising a high-pressure and low-pressure pipeline system and related equipment. The high-pressure and low-pressure pipeline system includes a high-pressure steam injection pipeline and a low-pressure pipeline respectively connecting well I and well P. The related equipment includes pump I, pump P, water tank No. 1, water tank No. 2, and centrifugal pump. Well I is connected in sequence to the second plug valve, flow meter, and pressure gauge via pipelines, and then to the horizontal high-pressure steam injection pipeline and the pipeline connecting to pump I via the well I four-way valve; Well I is also connected to the well I three-way valve via pipelines, and the well I three-way valve is connected to the well I four-way valve via the first plug valve and to water tank No. 1 via a low-pressure pipeline. The low-pressure pipeline is equipped with a pressure gauge, flow meter, and sixth plug valve; Well P is connected to the fourth plug valve, flow meter, and pressure gauge in sequence via pipelines, and then to the high-pressure steam injection pipeline and the pipeline connecting to the P pump via the P well four-way valve; Well P is also connected to the P well three-way valve via pipelines, and the P well three-way valve is connected to the P well four-way valve via the fifth plug valve and to the No. 2 water tank via the low-pressure pipeline. The low-pressure pipeline is equipped with a pressure gauge, flow meter, and seventh plug valve; Water tanks No. 1 and No. 2 are connected to centrifugal pumps via pipelines, and the centrifugal pumps are then connected to pumps I and P via pipelines, forming a fluid transmission and distribution loop during the injection and extraction process.

[0005] This utility model has the following main advantages: Integration advantage: It realizes the integrated connection of pipelines between injection and production equipment at the SAGD wellhead, avoiding the messy problem of traditional decentralized pipeline layout, simplifying the installation and construction process, and saving installation time and labor costs. Through functional integration and rapid switching, the preparation time between different operations is shortened by more than %, significantly improving the effective operation time of the well site.

[0006] Convenient monitoring and control: Centrally located pressure gauges and flow meters enable convenient real-time monitoring of key parameters such as pressure and flow rate during the injection and production process. This allows for timely adjustments to the injection and production operation based on these parameters, improving the controllability of the process. Clear functional zoning and pipeline labeling fundamentally reduce the risk of operational errors.

[0007] Enhanced safety: The integrated pipeline connection method reduces the number of pipeline connection points, lowers the probability of safety hazards such as leaks caused by poor pipeline sealing, and also facilitates fault diagnosis and maintenance of the pipeline system, ensuring the safe and stable operation of SAGD mining operations, thereby improving the overall efficiency of SAGD mining.

[0008] Significantly reduced costs: A single pipeline network can be reused multiple times, reducing the need for pipe and equipment rentals and repetitive labor inputs, thus achieving cost reduction and efficiency improvement. Dedicated pipes are used for the collection and closed-loop transmission of backflow fluid and well-washing wastewater, achieving "no mud spillage and complete wastewater collection," meeting the requirements of green and environmentally friendly construction.

[0009] Standardization and scalability: This system has established a set of standard temporary process specifications for well sites, which are not only applicable to SAGD operations, but can also be extended to other oil and gas field development scenarios that require large-scale fluid operations, thus promoting the progress of industry construction standards. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the construction pipeline connection for the SAGD wellhead injection and collection pipeline device of this utility model. Figure 2 This is a schematic diagram of the high and low pressure pipeline system and related equipment integrated into the skid base structure of this utility model. Detailed Implementation

[0011] The purpose of this invention is to provide a SAGD wellhead injection and production pipeline device to achieve integrated connection of pipelines between SAGD wellhead injection and production related equipment, simplify the installation process, facilitate centralized monitoring and control of injection and production process parameters, and improve the efficiency and safety of SAGD mining.

[0012] (1) Functional integration: Through a set of main pipeline network architecture, it is compatible with the fluid transportation needs of three core functions: production preheating, well washing and fracturing operations.

[0013] (2) Safety isolation: Ensure that pipelines with different functions can be physically or process isolated when necessary to prevent fluid cross-contamination.

[0014] (3) Efficient switching: Through standardized interface and valve group design, it can realize rapid and safe switching between different operating modes and shorten non-production time.

[0015] (4) Resource coordination: Optimize the allocation of resources such as water tanks and pump trucks so that they can be reused efficiently in different operations.

[0016] like Figures 1 to 2 As shown, a SAGD wellhead injection and collection pipeline system includes a high- and low-pressure pipeline system and associated equipment integrated into a skid mount 10. The high- and low-pressure pipeline system includes a high-pressure steam injection pipeline 11 and a low-pressure pipeline 12 that connect well I and well P respectively. The associated equipment includes pump I 21, pump P 22, water tank 1 23, water tank 2 24 and centrifugal pump 25.

[0017] Connections to Well I: Well I is connected in sequence to the second stopcock valve 2, flow meter 31, and pressure gauge 32 via pipelines, and then to the transverse high-pressure steam injection pipeline 11 and the pipeline connecting to pump I 21 via the well four-way valve 33; Well I is also connected to the well three-way valve 34 via pipelines, and the well three-way valve 34 is connected to the well four-way valve 33 via the first stopcock valve 1 and to the No. 1 water tank 23 via the low-pressure pipeline 12. The low-pressure pipeline 12 is equipped with pressure gauge 32, flow meter 31 and sixth stopcock valve 6.

[0018] P-well side connection: P-well is connected to the fourth stop valve 4, flow meter 31, and pressure gauge 32 in sequence through pipelines, and then connected to the high-pressure steam injection pipeline 11 and the pipeline connecting to P pump 22 through P-well four-way 35; P-well is also connected to P-well three-way 36 through pipelines, and P-well three-way 36 is connected to P-well four-way 35 through the fifth stop valve 5 and to No. 2 water tank 24 through low-pressure pipeline 12. Pressure gauge 32, flow meter 31 and seventh stop valve 7 are installed on the low-pressure pipeline.

[0019] Water tank 23 and water tank 24 are connected to centrifugal pump 25 via pipelines. Centrifugal pump 25 is then connected to pump I 21 and pump P 22 via pipelines, forming a fluid transmission and distribution loop in the injection and production process.

[0020] The high-pressure steam injection pipeline uses high-pressure grade fittings to meet the high-pressure fluid transportation requirements of reservoir stimulation. The low-pressure pipeline is compatible with the well-washing pipeline for well-washing fluid transportation and produced fluid collection, and the design pressure meets the requirements of circulating well-washing operations. Seven sets of plug valves (1-7) are integrated at key nodes of each pipeline as the control core, together with pressure gauge 32 and flow meter 31, to form an integrated hub that integrates circulating well-washing, reservoir stimulation (fracturing preparation) and pump forward and reverse flushing functions, so as to achieve precise control of fluid flow direction, pressure and flow rate under different operating scenarios.

[0021] In practice, the I / P pump purges air via self-circulation. The second stopcock valve 2, the third stopcock valve 3, and the fourth stopcock valve 4 are closed, while the first stopcock valve 1, the sixth stopcock valve 6, the fifth stopcock valve 5, and the seventh stopcock valve 7 are opened. After the pump starts, the fluid circulates within the circuit, gradually carrying away air from the pump and main pipeline and discharging it through the exhaust valve or low-pressure system. This mode ensures the stability and efficiency of the power system during startup and eliminates the "air binding" phenomenon.

[0022] For small-displacement well washing operations, close the first stopcock valve 1, the third stopcock valve 3, and the fifth stopcock valve 5, and open the second stopcock valve 2, the sixth stopcock valve 6, the fourth stopcock valve 4, and the seventh stopcock valve 7. The pipeline of pump I 21 enters well I and then returns from the pipeline of water tank 23 to complete the circulation well washing of well I. The pipeline of pump P 22 enters well P and then returns from the pipeline of water tank 24 to complete the circulation well washing of well P.

[0023] The large-displacement dual-pump I well is injected by closing the first plug valve 1, the fourth plug valve 4, the fifth plug valve 5, and the seventh plug valve 7, and opening the second plug valve 2, the third plug valve 3, and the sixth plug valve 6. The I pump 21 and the P pump 22 work together to inject high-pressure fluid into the I well through the second plug valve 2, and the circulating pressure of the injected fluid is adjusted by the third plug valve 3.

[0024] The large-displacement dual-pump P-well is injected by closing the first plug valve 1, the second plug valve 2, the sixth plug valve 6, and the fifth plug valve 5, and opening the third plug valve 3, the fourth plug valve 4, and the seventh plug valve 7. Pump I 21 and pump P 22 work together to inject high-pressure fluid into the P-well through the fourth plug valve, and the circulating pressure of the injected fluid is adjusted by the third plug valve 3.

[0025] When injecting into the I / P wells normally, close the first plug valve 1, the third plug valve 3, and the fifth plug valve 5, and open the second plug valve 2, the sixth plug valve 6, the fourth plug valve 4, and the seventh plug valve 7. Adjust the sixth plug valve 6 and the seventh plug valve 7 according to the instructions to control the backflow pressure.

[0026] Integration advantages: It achieves integrated connection of pipelines between injection and production equipment at the SAGD wellhead, avoiding the messy problems of traditional decentralized pipeline layout, simplifying the installation and construction process, and saving installation time and labor costs. Through functional integration and rapid switching, the preparation time between different work areas is reduced by more than 50%, significantly improving the effective operation time of the well site.

[0027] Convenient monitoring and control: The centrally located pressure gauges 32 and flow meters 31 facilitate real-time monitoring of key parameters such as pressure and flow rate during the injection and production process. This allows for timely adjustments to the injection and production operation based on these parameters, improving the controllability of the process. Clear functional zoning and pipeline labeling fundamentally reduce the risk of operational errors.

[0028] Enhanced safety: The integrated pipeline connection method reduces the number of pipeline connection points, lowers the probability of safety hazards such as leaks caused by poor pipeline sealing, and also facilitates fault diagnosis and maintenance of the pipeline system, ensuring the safe and stable operation of SAGD mining operations, thereby improving the overall efficiency of SAGD mining.

[0029] Significantly reduced costs: A single pipeline network can be reused multiple times, reducing the need for pipe and equipment rentals and repetitive labor inputs, thus achieving cost reduction and efficiency improvement. Dedicated pipes are used for the collection and closed-loop transmission of backflow fluid and well-washing wastewater, achieving "no mud spillage and complete wastewater collection," meeting the requirements of green and environmentally friendly construction.

[0030] Standardization and scalability: This system has established a set of standard temporary process specifications for well sites, which are not only applicable to SAGD operations, but can also be extended to other oil and gas field development scenarios that require large-scale fluid operations, thus promoting the progress of industry construction standards.

Claims

1. A SAGD wellhead injection and acquisition pipeline system, characterized in that, It includes high and low pressure pipeline systems and related equipment. The high and low pressure pipeline systems include a high pressure steam injection pipeline (11) and a low pressure pipeline (12) that connect well I and well P respectively. The related equipment includes pump I (21), pump P (22), water tank No. 1 (23), water tank No. 2 (24) and centrifugal pump (25). Well I is connected in sequence to the second plug valve (2), flow meter (31), and pressure gauge (32) via pipelines. It is then connected to the horizontal high-pressure steam injection pipeline (11) and the pipeline connecting to pump I (21) via the well four-way valve (33). Well I is also connected to the well three-way valve (34) via pipelines. The well three-way valve (34) is connected to the well four-way valve (33) via the first plug valve (1) and to the No. 1 water tank (23) via the low-pressure pipeline (12). The low-pressure pipeline (12) is equipped with a pressure gauge (32), a flow meter (31), and a sixth plug valve (6). Well P is connected in sequence to the fourth stop valve (4), flow meter (31), and pressure gauge (32) via pipelines. It is then connected to the high-pressure steam injection pipeline (11) and the pipeline connecting to the P pump (22) via the P well four-way (35). Well P is also connected to the P well three-way (36) via pipelines. The P well three-way (36) is connected to the P well four-way (35) via the fifth stop valve (5) and to the No. 2 water tank (24) via the low-pressure pipeline (12). The low-pressure pipeline (12) is equipped with a pressure gauge (32), a flow meter (31), and a seventh stop valve (7). Water tank No. 1 (23) and water tank No. 2 (24) are connected to centrifugal pump (25) through pipelines. Centrifugal pump (25) is then connected to pump I (21) and pump P (22) through pipelines, forming a fluid transmission and distribution loop in the injection and extraction process.

2. The SAGD wellhead injection and acquisition pipeline system according to claim 1, characterized in that, High and low pressure pipeline systems and related equipment are integrated in skid (10).

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