A segmented full-scale completion simulation experimental system

Abstract

The application belongs to the field of completion simulation experiment, and relates to a segmented full-size simulation test system for simulating various complex completion well conditions, which comprises a simulation wellbore module, a medium injection module, a medium circulation module and a data detection module; the simulation wellbore module comprises a high-temperature heating device, a simulation wellbore, a high-pressure hose and a high-pressure joint; the medium injection module comprises an oil-gas-water three-phase mixing device, a multiphase fluid mixing pipeline and oil, gas and water pressurized injection devices; the medium circulation module comprises a fluid cooling device, an oil-gas-water three-phase separation device, an oil tank and a water tank; and the data detection module comprises fluid pressure sensors, flow sensors, temperature sensors and signal processing equipment; the application provides a segmented full-size simulation test system capable of simulating various complex completion well conditions, and provides an experimental basis for studying various special completion operation conditions.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of drilling and completion simulation experiments, and in particular to a segmented full-scale completion simulation experiment system. BACKGROUND

[0002] In recent years, the focus of oil and gas exploration and development in China has extended to deep shale gas, shale oil, deep sea and other oil and gas reservoirs, and more and more special structure wells such as horizontal wells, large displacement wells, and multi-lateral wells are being drilled, and they are facing downhole environments such as ultra-high temperature, ultra-high pressure, and strong corrosion. How to optimize the completion methods and production management of these special structure wells has become a key problem that needs to be solved urgently in China's oil and gas production. For example, in order to achieve the purpose of "high yield with few wells" in shale gas wells, increasing the length of the horizontal section in deep shale gas development is an effective means. However, due to uneven distribution of natural fractures in the formation, large differences in rock mechanics properties, and different fracturing effects, it is difficult to complete the whole well section modification using a pump bridge plug, resulting in non-uniform production in long water wells in shale gas, and easy occurrence of bottom water coning or gas cap coning during separate layer production, which seriously affects shale gas production and production life. In the exploration and development of hot dry rock and deep, deep sea oil and gas reservoirs, due to the ultra-high temperature and ultra-high pressure operating conditions, traditional electronic sensing systems are difficult to adapt, which restricts the development of hot dry rock energy and deep, deep sea oil and gas resources.

[0003] In order to study the completion technology of ultra-high temperature and ultra-high pressure, complex and harsh well conditions, and to reasonably solve the problems encountered in the above completion process, completion simulation experiments are widely used as a research method. The current completion simulation experiment system has various forms, but mainly has the following two problems:

[0004] 1. Taking patent 202010233182.2 as an example, this type of experiment system carries out experiment simulation based on the similarity principle, simulates completion fluid and formation conditions with water and sand, and then inverses the actual working conditions through the similarity principle. This type of completion simulation experiment system mainly conducts conventional production, seepage, and migration experiments, and has the advantages of good experiment safety and low experiment cost. However, it is limited in the experimental projects it can carry out because it cannot reflect the well conditions under ultra-high temperature and ultra-high pressure.

[0005] 2. Taking patents 201310185629.3, 201410310141.3, and 202111196772.3 as examples, this type of experiment system can be used to carry out completion engineering fracturing, flow, and sand control simulation experiments, and provides equipment and method basis for studying corresponding completion technologies. However, it cannot simulate ultra-high temperature, ultra-high pressure, uneven distribution of natural fractures in the formation, and large differences in rock mechanics properties, i.e. it is difficult to simulate complex and harsh well conditions and special production accidents.

[0006] Aiming at the above-mentioned complex and poor working conditions and the defects of the current completion simulation experiment system, a segmented full-size completion simulation system is designed, which is a technical problem to be solved by those skilled in the art. SUMMARY

[0007] The present application aims to provide a segmented full-size completion simulation system, which can simulate various completion well conditions under ultra-high temperature and ultra-high pressure, and is equipped with complete liquid circulation, injection, data acquisition, safety and environmental protection system, and can carry out various completion engineering technology experiments, simulate various downhole completion accidents, and provide experimental equipment and methods for studying completion engineering technology under complex and poor working conditions.

[0008] A segmented full-size completion simulation experiment system, comprising a simulated wellbore module, a medium injection module, a medium circulation module, and a data detection module.

[0009] Further, the simulated wellbore module comprises a high-temperature heating device, a simulated wellbore, a high-pressure hose, and a high-pressure joint; each simulated wellbore is connected by a high-pressure joint and a high-pressure hose.

[0010] Further, the medium injection module comprises an oil-gas-water three-phase mixing device, a multiphase fluid mixing pipeline, and an oil, gas, and water pressurized injection device; the oil, gas, and water pressurized injection device is connected in sequence to the multiphase fluid mixing pipeline, the oil-gas-water three-phase mixing device, and the simulated wellbore; and the high-temperature heating device is connected to the simulated wellbore.

[0011] Further, the medium circulation module comprises a pressure reduction system, a fluid cooling device, an oil-gas-water three-phase separation device, an oil tank, and a water tank; the simulated wellbore is connected in sequence to the fluid cooling device, the oil-gas-water three-phase separation device, the oil tank, and the water tank.

[0012] Further, the data detection module comprises a fluid pressure sensor A, a flow sensor A, a temperature sensor A, and a signal processing device.

[0013] Further, the simulated wellbore module is composed of 3-5 simulated wellbores, and is matched with 3-5 medium injection modules, which are used to simulate segmented fracturing, oil and gas production, and downhole working conditions of different formation pressures.

[0014] Further, a pressure relief valve A is connected in series and an overflow valve A is connected in parallel on the high-pressure hose; in single-wellbore simulation experiments, the fluid is directly connected to the medium circulation module through the overflow valve A, and in multi-wellbore simulation experiments, the liquid is connected through the high-pressure hose.

[0015] Further, the multiphase fluid mixing pipeline is formed by nine identical fluid pipelines in parallel, the fluid is from the oil, gas and water pressurized injection device, the nine fluid pipelines are divided into three oil pipelines, three gas pipelines and three water pipelines, every three oil, gas and water pipelines are combined into a three-phase fluid mixing device and then injected into the simulated wellbore.

[0016] Further, one pressure relief valve B, one pressure sensor B, one flow sensor B, one throttle valve B and one pressure reducing valve B are arranged on each of the nine fluid pipelines, the pressure and flow of the oil, gas and water injected into each simulated wellbore are controlled individually, different oil-gas-water mixing ratios are simulated, and a one-way valve A is arranged at the end close to the three-phase fluid mixing device to prevent liquid backflow.

[0017] Further, the high-temperature heating device comprises a heat source, heat exchange pipelines and heat exchange medium, the heat exchange pipelines comprise three to five identical heat exchange pipelines which are respectively and independently connected to the heat source and the simulated wellbores, and a throttle valve C is arranged on each heat exchange pipeline to control the flow of the heat exchange medium and thus control the heating temperature.

[0018] Further, the data detection module comprises a pressure sensor A, a flow sensor A and a temperature sensor A, and a data processing device, one pressure sensor A, one flow sensor A and one temperature sensor A are arranged on each high-pressure connector, and the pressure sensor A, the flow sensor A and the temperature sensor A are connected to the data processing device.

[0019] Further, the fluid cooling device is connected to a pressure reduction system in front, the pressure reduction system comprises one to five pressure reducing valves C connected in series, and the high-pressure fluid is gradually depressurized to reduce the risk.

[0020] Further, the simulated wellbores in the simulated wellbore module can also be in a parallel relationship to realize different operation condition simulation, the medium injection module is unchanged, the simulated wellbores are connected in parallel with each other, the wellbore fluid is finally collected to the same pipeline for pressure relief, and a one-way valve is additionally arranged on each wellbore fluid output pipeline of the medium circulation module to prevent mutual influence between the wellbores.

[0021] The present application has the following advantages: the present application belongs to a completion experiment simulation system, has a complete fluid circulation system, a pressurized and heated injection system, a simulated wellbore system and a data processing system, proposes a three-section type experimental system and method for simulating completion working conditions, can independently control the simulated well conditions or can be connected in series to perform simulation experiments, can safely, environmentally, completely and truly simulate various completion working conditions, and provides a device basis for simulation experiments under various well conditions. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the experimental system;

[0023] Figure 2 Figure is a schematic diagram of the arrangement of the segmented analog wellbore sensor, valve group;

[0024] Figure 3 Figure is a schematic diagram of the injection system structure;

[0025] Figure 4 Figure is a schematic diagram of the heating device structure;

[0026] Figure 5 Figure is the arrangement of parallel wellbores;

[0027] In the figure: A-analog wellbore module, B-medium injection module, C-medium circulation module, D-data detection module, 1-high temperature heating device, 2-analog wellbore, 3-high pressure hose, 4-high pressure joint, 5-oil, gas, and water three-phase mixing device, 6-multiphase fluid mixing pipeline, 7-oil, gas, and water pressurized injection device, 8-pressure reduction system, 9-fluid cooling device, 10-oil, gas, and water three-phase separation device, 11-oil tank, 12-water tank, 13-pressure sensor A, 14-flow sensor A, 15-temperature sensor A, 16-signal processing equipment, 17-pressure relief valve A, 18-overflow valve A, 101-heat source, 102-heat exchange pipeline, 103-heat exchange medium, 104-throttle valve C, 202-one-way valve A, 601-fluid pipeline, 602-pressure relief valve B, 603-pressure sensor B, 604-flow sensor B, 605-throttle valve B, 606-pressure reducing valve B, 607-one-way valve A, 801-pressure reducing valve C. DETAILED DESCRIPTION

[0028] The present application will be further described below in conjunction with the accompanying drawings, and the protection scope of the present application is not limited to the following description:

[0029] As shown in Figure 1 , 2 , the segmented full-size completion simulation system includes analog wellbore module A, medium injection module B, medium circulation module C, and data detection module D.

[0030] The simulation wellbore module comprises a high-temperature heating device 1, a simulation wellbore 2, a high-pressure hose 3, and a high-pressure joint 4; each simulation wellbore 2 is connected by the high-pressure joint 4 and the high-pressure hose 3; the medium injection module B comprises an oil-gas-water three-phase mixing device 5, a multi-phase fluid mixing pipeline 6, and an oil-gas-water pressurized injection device 7; the oil-gas-water pressurized injection device 7 is sequentially connected to the multi-phase fluid mixing pipeline 6, the oil-gas-water three-phase mixing device 5, and the simulation wellbore 2; the high-temperature heating device 1 is connected to the simulation wellbore 2; the medium circulation module C comprises a pressure reduction system 8, a fluid cooling device 9, an oil-gas-water three-phase separation device 10, an oil tank 11, and a water tank 12; the simulation wellbore 2 is sequentially connected to the fluid cooling device 9, the oil-gas-water three-phase separation device 10, the oil tank 11, and the water tank 12; the data detection module D comprises a fluid pressure sensor A13, a flow sensor A14, a temperature sensor A15, and a signal processing device 16.

[0031] According to the above-mentioned segmented full-size completion simulation system, a specific test method comprises the following steps:

[0032] S1: Different completion tools such as open hole, screen pipe, and casing are installed in the three simulation wellbores 2 to realize casing perforation, open hole, fracturing, and simulation of different well inclinations; and wellbore input parameters (including temperature, pressure, etc.) are set according to different completion states; S2: The simulation wellbore 2 is heated by the high-temperature heating device 1 to realize high-temperature simulation; S3: Different segmented pressure and flow are simulated by controlling the injected oil-gas-water pressure and flow; S4: The high-pressure oil-gas-water enters the simulation wellbore 2 to obtain oil-gas-water three-phase mixed fluid through the three-phase fluid mixing device 5; S5: The oil-gas-water three-phase mixed fluid discharged from the simulation wellbore 2 flows into the medium circulation module C for separation and recycling.

[0033] As shown in Figure 3 The multi-phase fluid mixing pipeline 6 is composed of nine identical fluid pipelines 601 connected in parallel, and the fluid source is the oil-gas-water pressurized injection device 7; the nine fluid pipelines 601 are divided into three oil pipelines, three gas pipelines, and three water pipelines; every three oil, gas, and water pipelines converge into one three-phase fluid mixing device 5 and then are injected into the simulation wellbore 2; one pressure relief valve B602, one pressure sensor B603, one flow sensor B604, one throttle valve B605, and one pressure reduction valve B606 are arranged on each of the nine medium pipelines, and the oil-gas-water pressure and flow injected into each simulation wellbore 2 are controlled individually.

[0034] The step of controlling pressure and flow of different well sections is: S31: high pressure oil, gas and water provided by the medium injection module B; S32: the high pressure oil, gas and water enters the multiphase fluid mixing pipeline 6 and passes through the pressure reducing valve B606 and the throttle valve B605 on each pipeline respectively to obtain oil, gas and water with different pressure and flow, and the pressure and flow are determined by the pressure sensor B603 and the flow sensor B604.

[0035] As shown in Figure 4 The high-temperature heating device includes a heat source 101, heat exchange pipelines 102 and heat exchange medium 103. The heat exchange pipelines 102 are divided into heat exchange pipelines 1, 2 and 3, which are independently connected with the three sections of the simulated wellbore 2 and the heat source 101. A throttle valve C104 is arranged on each heat exchange pipeline 102 for controlling the flow of the heat exchange medium 103 and thus controlling the heating temperature.

[0036] The above only the preferred embodiment of the present application, and is not intended to limit the application, for those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A segmented full-scale completion simulation laboratory system, characterized by: It comprises an analog wellbore module (A), a medium injection module (B), a medium circulation module (C) and a data detection module (D). The analog wellbore module (A) comprises a high-temperature heating device (1), an analog wellbore (2), a high-pressure hose (3) and a high-pressure joint (4); each analog wellbore (2) is connected through the high-pressure joint (4) and the high-pressure hose (3); The medium injection module (B) comprises an oil-gas-water three-phase mixing device (5), a multiphase fluid mixing pipeline (6), an oil-gas-water pressurized injection device (7); the oil-gas-water pressurized injection device (7) is connected with the multiphase fluid mixing pipeline (6), the oil-gas-water three-phase mixing device (5) and the analog wellbore (2) in sequence; the high-temperature heating device (1) is connected with the analog wellbore (2); The medium circulation module (C) comprises a pressure reduction system (8), a fluid cooling device (9), an oil-gas-water three-phase separation device (10), an oil tank (11) and a water tank (12); the analog wellbore (2) is connected with the fluid cooling device (9), the oil-gas-water three-phase separation device (10), the oil tank (11) and the water tank (12) in sequence; The data detection module (D) comprises a fluid pressure sensor A (13), a flow sensor A (14), a temperature sensor A (15) and a signal processing device (16); The analog wellbore module (A) is composed of 3-5 analog wellbores (2) and is matched with 3-5 medium injection modules (B) for simulating downhole working conditions such as staged fracturing, oil and gas production and different formation pressures; The multiphase fluid mixing pipeline (6) is composed of 9 identical fluid pipelines (601) connected in parallel; the fluid source is the oil-gas-water pressurized injection device (7); the 9 fluid pipelines (601) are divided into 3 oil pipelines, 3 gas pipelines and 3 water pipelines; every 3 oil, gas and water pipelines converge into one three-phase fluid mixing device (5) and then are injected into the analog wellbore (2); One pressure relief valve B (602), one pressure sensor B (603), one flow sensor B (604), one throttle valve B (605) and one pressure relief valve B (606) are connected in series on each of the 9 fluid pipelines (601) for individually controlling the oil, gas and water pressure and flow rate injected into each analog wellbore (2) to simulate different oil-gas-water mixing ratios; a one-way valve A (607) is arranged at the end close to the three-phase fluid mixing device (5) to prevent liquid backflow; The high-temperature heating device (1) comprises a heat source (101), heat exchange pipelines (102) and a heat exchange medium (103); the heat exchange pipelines (102) comprise 3-5 identical heat exchange pipelines which are respectively and independently connected with the heat source (101) and the analog wellbores (2); one throttle valve C (104) is arranged on each heat exchange pipeline (102) for controlling the flow rate of the heat exchange medium (103) and thus controlling the heating temperature; One pressure relief valve A (17) and one overflow valve A (18) are connected in series on the high-pressure hose (3); in single-wellbore simulation experiment, the fluid is directly conducted to the medium circulation module (C) through the overflow valve A (18); in multi-wellbore simulation experiment, the fluid is conducted through the high-pressure hose (3).

2. The segmented full-scale completion simulation experimental system according to claim 1, characterized in that: Each high-pressure connector (4) is provided with a pressure sensor A (12), a flow sensor A (13), and a temperature sensor A (14), each of which is connected to a data processing device (15).

3. The segmented full-scale completion simulation experimental system according to claim 1, wherein: The fluid cooling device (9) is connected with a decompression system (8) in front, the decompression system is 1-5 series decompression valves (801), and high-pressure fluid is gradually decompressed to reduce the risk.

4. The segmented full-scale completion simulation experimental system according to claim 1, characterized in that: The simulation wellbores (2) in the simulation wellbore module (A) are in parallel connection to simulate different operation conditions, the medium injection module (B) is unchanged, the simulation wellbores (2) are connected in parallel with each other, the wellbore fluids are finally collected to the same pipeline for pressure relief, and are connected to the medium circulation module (C), and a one-way valve (202) is additionally arranged on each wellbore fluid output pipeline to prevent mutual influence between the simulation wellbores.

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