Device for evaluating augmented injection effect of water injection well in updip area

Abstract

The utility model belongs to the technical field of oilfield chemical physical models, and particularly relates to an injection increasing effect evaluation device for a water injection well in an updip area. The system comprises a to-be-tested rock core plate, a physical model device, a liquid injection system, a liquid extraction system and a data acquisition system, the to-be-tested rock core plate is formed by stacking three layers of right prism-shaped rock core blocks, and the shape of the to-be-tested rock core plate is a right triangular prism of which the bottom surface is a right triangle; the three layers of core blocks are sequentially arranged along one right-angle side of the bottom face of the straight triangular prism, the core block located in the middle is taken from an injection well of an oil field to be detected, the core blocks located on the two sides are taken from an oil producing well of the oil field to be detected, and an injection opening is formed in the core block located in the middle. And the core blocks on the two sides are provided with extraction ports. By means of the device for evaluating the augmented injection effect of the water injection well in the updip area, the augmented injection effect of the water injection well in the updip area can be accurately evaluated.

Description

Technical Field

[0001] The utility model belongs to the technical field of oilfield chemical modeling, and in particular relates to an injection effect evaluation device for water injection wells in an up-dip area. Background Art

[0002] The following problems may occur in the process of oilfield exploitation: the spacing between injection and production wells is long, and the physical properties of the sedimentary sand bodies in the underground oil reservoirs corresponding to the injection and production wells change rapidly, resulting in increased physical property heterogeneity. This is manifested as the water injection wells cannot be injected, the pressure is high, and the injected water has no obvious direction, which affects the recovery rate. At this time, chemical agents need to be injected into the underground sand bodies to unblock them. At present, there is a lack of equipment for quantitatively evaluating the chemical effects of chemical types and scales under different sedimentary phases, which makes it impossible to accurately obtain the injection effect of underground rocks in the oilfield area and accurately determine the reasonable dosage of chemical agents. Small dosage will lead to low oilfield recovery, and high dosage will lead to waste. Utility Model Content

[0003] The utility model aims to provide an injection effect evaluation device for water injection wells in an up-dip area, so as to solve the problem that the injection effect of underground rocks in the oil field area cannot be accurately obtained in the prior art, and thus the reasonable dosage of chemical agents cannot be accurately determined.

[0004] In order to solve the above technical problems, the utility model provides an injection effect evaluation device for water injection wells in an up-dip area, comprising a core plate to be tested, a physical model device, a liquid injection system, a liquid production system and a data acquisition system, wherein the core plate to be tested is formed by stacking three layers of core blocks in the shape of right prisms and its shape is a right triangular prism with a right-angled triangle bottom surface, the three layers of core blocks are arranged in sequence along one of the right-angled sides of the bottom surface of the right triangular prism, wherein the core block located in the middle is a core block taken from the injection well of the oil field to be tested, and the core blocks located on both sides are core blocks taken from the oil production well of the oil field to be tested, and a plurality of injection ports and a plurality of production ports are opened on the triangular bottom surface of the core plate to be tested, the injection ports are opened on the core block located in the middle, and the production ports are opened on the core blocks located on both sides;

[0005] The physical model device is used to contain the core plate to be tested and to apply pressure on its surroundings and bottom. After the core block is placed in the physical model device, the side surface adjacent to one of the right-angled sides of the triangular bottom surface of the core block is parallel to the horizontal plane; the liquid injection system is used to inject unblocking liquid and polymer liquid into the core plate; the liquid extraction system is used to extract the liquid in the core plate; the data acquisition system is used to measure parameters used to evaluate the injection effect so as to determine the injection effect of the injection well of the oil field to be tested.

[0006] The beneficial effect is as follows: a core block taken from an injection well of the oil field to be tested and two core blocks taken from an oil production well of the oil field to be tested are stacked together to form a core block to be tested in the shape of a right triangular prism with a right-angled triangle bottom surface, and the core block of the injection well is located in the middle and the core blocks of the oil production well are located on both sides, and the three layers of core blocks are arranged in sequence along one of the right-angled sides of the bottom surface of the right triangular prism, and the relative position of the core block of the oil production well and the core block of the water injection well is similar to the relative position of the water injection well and the oil production well in the injection and production well network of the oil field, so that the density of the underground rock of the oil field to be tested can be characterized by the density of the core block to be tested, and the increase of the core block to be tested can be used to characterize the density of the underground rock of the oil field to be tested. The injection effect can evaluate the injection effect of the oil field to be tested; the polymer liquid is injected into the core block to be tested by using the liquid injection system. When the liquid injection system reaches the equipment pressure limit, the polymer liquid cannot be injected, thereby simulating the pollution of the polymer to the oil field to be tested. When the polymer liquid cannot be injected, the unblocking liquid is injected into the core block to be tested, and the unblocking effect of the core block to be tested can be quantitatively evaluated according to the changes in pressure and flow at the injection port and the production port. Then, the injection effect of the water injection well in the oil field to be tested can be evaluated based on the unblocking effect of the core block to be tested, and the reasonable amount of chemical agents used for unblocking can be determined. The device for evaluating the injection effect of water injection wells in up-dip areas of the utility model can accurately evaluate the injection effect of water injection wells in up-dip areas, and then accurately determine the reasonable amount of chemical agents used for unblocking.

[0007] Preferably, the liquid injection system is also used to inject clean water into the core plate, and the data acquisition system is also used to measure the resistance and flow direction of the liquid in the core block to be tested during the test.

[0008] The beneficial effect is that by injecting clean water into the core block to be tested and measuring the resistance value and flow direction of the liquid in the core block to be tested, the flow direction trend of the fluid in the core of the oil field to be tested can be qualitatively evaluated.

[0009] Preferably, the liquid injection system includes an injection liquid conduit, one end of which is connected to the injection port of the core block to be tested, and the other end is connected to the outlet of the booster pump, and the inlet of the booster pump is switched and connected to the deblocking liquid storage tank, the polymer storage tank and the clean water storage tank.

[0010] Preferably, the liquid production system comprises a plurality of production fluid conduits respectively connected to the production outlets of the core block to be tested, and the production fluid conduits are connected to the liquid drainage tank.

[0011] Preferably, the data acquisition system includes several flow meters and / or several pressure sensors, the flow meters are used to collect the flow rates of the injection port and the production port of the core block to be tested in the parameters, and the pressure sensors are used to collect the pressures of the injection port and the production port of the core block to be tested in the parameters.

[0012] Preferably, the data acquisition system comprises a plurality of vibration sensors, and the vibration sensors are used to detect vibration signals to obtain the flow direction of the liquid in the core block to be measured.

[0013] Preferably, the physical model device comprises a groove adapted to the shape and size of the core block to be tested and used to place the core plate to be tested, and a ring pressure device for applying pressure to the periphery and bottom of the core block to be tested is arranged in the groove.

[0014] Preferably, a bottom plate for mounting a vibration signal receiving probe of the vibration sensor is provided at the bottom of the groove.

[0015] Preferably, the physical model device further comprises a cover plate for covering the upper surface of the core plate to be tested after it is placed in the groove.

[0016] The beneficial effect is that by setting the cover plate, liquid seeping out of the core block to be tested during the experiment can be prevented from polluting the environment.

[0017] Preferably, an anti-corrosion film is provided on the inner surface of the groove.

[0018] The beneficial effect is that by attaching an anti-corrosion film to the inner surface of the groove, the groove can be prevented from being corroded or liquid leaking from the groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional diagram of the core plate to be tested of the utility model;

[0020] Figure 2 It is a cross-sectional view of the physical model device of the utility model on which the core plate to be tested is placed.

[0021] Figure 3 It is a three-dimensional diagram of the object model device of the utility model.

[0022] The figures are marked as follows: 1-first core block, 2-second core block, 3-third core block, 4-injection port, 5-first production port, 6-second production port, 7-vibration signal receiving probe, 8-ring pressure device, 9-bottom plate. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0024] Embodiment of the device for evaluating the effect of water injection well in the up-dip area:

[0025] like Figure 1 and Figure 2As shown, the device for evaluating the effect of water injection wells in the up-dip area of ​​the utility model includes a core plate to be tested, a physical model device for containing the core plate to be tested and applying pressure to the surrounding and bottom thereof, a liquid injection system for injecting acid, polymer liquid and clean water into the core plate, a liquid extraction system for extracting the liquid in the core plate, and a data acquisition system. The data acquisition system is used to measure the temperature, pressure and liquid flow rate at the injection port and extraction port of the core block to be tested, and is also used to measure the resistance value of the liquid in the core plate, and is also used to measure the flow direction of the liquid in the core block. The core plate to be tested is provided with a plurality of injection ports, a resistance measurement port and a plurality of extraction ports. Preferably, one injection port and four extraction ports are provided. Figures 1 to 3 There is one injection port, injection port 4, and two production ports, namely the first production port 5 and the second production port 6; the injection port and the production port are opened on one surface of the core block, the depth of the injection port and the production port is 2-3cm, and the aperture is 0.5-1cm. The core plate to be tested is stacked by three layers of core blocks in the shape of right prisms, the three layers of core blocks are the first core block 1, the second core block 2 and the third core block 3, the shape of which is a right triangular prism with a right triangle bottom surface, and the angle range of an acute angle of the right triangle is 30 degrees to 45 degrees, the injection port and the production port are both opened on the triangular bottom surface of the core plate to be tested; the three layers of core blocks are arranged in sequence along one of the right-angled sides of the bottom surface of the right triangular prism, and the core block in the middle (i.e., the second core block 2) is a core block taken from an injection well of the oil field to be tested, and the core blocks located on both sides (i.e., the first core block 1 and the third core block 3) are core blocks taken from an oil production well of the oil field to be tested, the injection port is opened on the middle core block, and the production ports are opened on the core blocks located on both sides; the concave part of the groove of the core block to be tested is adapted to the shape and size of the core block to be tested, and after the core block is placed in the groove, the side surface adjacent to one of the right-angled sides of the bottom surface of the core block is parallel to the horizontal plane.

[0026] like Figure 3 As shown, the physical model device includes a groove for placing the core plate to be tested, a ring pressure device 8 is arranged in the groove for applying pressure to the surrounding and bottom of the core block to be tested, a cover plate is used to cover the upper surface of the core plate to be tested after it is placed in the groove, and a bottom plate 9 is arranged at the bottom of the recessed part of the groove for installing the vibration signal receiving probe 7. In order to ensure the stability of the groove, a metal groove is selected. In order to prevent the liquid flowing out of the core block from contacting the groove during the test, causing the groove to be corroded or leaked, a rubber film is affixed to the inner surface of the groove. By setting up the ring pressure device, the core blocks stacked together can be tightly fitted, thereby ensuring that the injected fluid does not flow in the gaps between the core blocks. By setting up the cover plate, the liquid seeping out of the core block to be tested during the experiment can be prevented from polluting the environment.

[0027] The cover plate is provided with a plurality of conduit holes for the conduits to pass through and a wire hole for the wires to pass through; the bottom plate is provided with a plurality of probe holes for installing vibration signal receiving probes of the vibration sensor, and the probe holes are arranged and installed in a square form at a number of 30 to 100 per square meter.

[0028] The liquid injection system includes an injection liquid conduit, one end of which is used to connect to the injection port of the core block to be tested through the conduit hole, and the other end is connected to the outlet of the booster pump, and the inlet of the booster pump is respectively connected to the unblocking liquid storage tank, the polymer storage tank and the clean water storage tank through a four-way valve. Preferably, the unblocking liquid is acid.

[0029] The liquid extraction system includes a first extraction fluid conduit, a second extraction fluid conduit, a third extraction fluid conduit and a fourth extraction fluid conduit respectively connected to four extraction ports of the core block to be tested, and the four extraction fluid conduits are also connected to the drainage tank through a pressure reducing valve. By providing a pressure reducing valve, the water flow pressure in the extraction fluid conduit can be reduced, thereby avoiding damage to the drainage tank.

[0030] The data acquisition system includes a first flow meter, a second flow meter, a third flow meter, a fourth flow meter and a fifth flow meter for respectively collecting the flow rates of the injection port and the four production ports of the core block to be tested, and also includes a first pressure sensor, a second pressure sensor, a third pressure sensor, a fourth pressure sensor and a fifth pressure sensor for respectively collecting the pressures of the injection port and the two production ports of the core block to be tested, and also includes a first temperature sensor, a second temperature sensor, a third temperature sensor, a fourth temperature sensor and a fifth temperature sensor for respectively collecting the temperatures of the injection port and the four production ports of the core block to be tested, and also includes a resistance measuring instrument for measuring the resistance of the liquid in the core block to be tested during the test, and also includes multiple vibration sensors for measuring the flow direction of the liquid in the core block to be tested during the test, and the signal output ends of all flow meters, pressure sensors, temperature sensors, resistance measuring instruments and vibration signal receiving probes are connected to the computer. Among them, the first flowmeter, the second flowmeter, the third flowmeter, the fourth flowmeter and the fifth flowmeter are respectively arranged at the outlets of the injection liquid conduit and the four produced liquid conduits, the first pressure sensor, the second pressure sensor, the third pressure sensor, the fourth pressure sensor and the fifth pressure sensor are respectively arranged at the outlets of the injection liquid conduit and the four produced liquid conduits, and the first temperature sensor, the second temperature sensor, the third temperature sensor, the fourth temperature sensor and the fifth temperature sensor are respectively arranged at the ports of the injection liquid conduit and the four produced liquid conduits. The measuring end of the resistance measuring instrument is connected with a wire, and the wire passes through the wire hole on the cover plate and is connected to the resistance measuring port opened on the core plate to be tested to measure the resistance value of the liquid in the core plate to be tested. Different vibration signal receiving probes are respectively arranged in different probe holes on the bottom plate.

[0031] The groove can be made of steel plate or other metal plate. The cover plate and the bottom plate are both made of resin rubber plate. The ring pressure device can use a ring pressure pump, which can be pressurized by hydraulic oil or water as the pressurizing medium.

[0032] The working principle of the device for evaluating the effect of water injection well in the up-dip area of ​​the utility model is as follows:

[0033] The process of evaluating the quantitative contamination of the core blocks of the oil field to be tested by the polymer solution and the effect and range of the acid solution on the polymer blockage is as follows:

[0034] 1) Place the core block to be tested in the groove and cover the top of the core block to be tested with a cover plate, connect the injection liquid conduit of the liquid injection system and the production liquid conduit of the liquid production system to the injection port and the production port opened on the core block to be tested through the conduit holes on the cover plate respectively; use the ring pressure device to apply pressure to the bottom surface and surrounding of the core block to be tested.

[0035] 2) Connecting the booster pump to the polymer liquid storage tank through a four-way valve, turning on the booster pump to inject the polymer solution into the core block to be tested until the injection liquid conduit reaches its upper pressure limit; during the polymer solution injection process, a two-dimensional relationship curve between the pressure at the injection port of the core block and the volume of the polymer solution injected into the core block is obtained based on the flow data collected by the first flow meter and the pressure data collected by the first pressure sensor.

[0036] By reading the flow rate data and time data of the flow meter, the volume of the polymer liquid pumped at the corresponding moment can be calculated.

[0037] The quantitative contamination of the core blocks of the oil field to be tested by the polymer can be evaluated based on the cumulative injection volume of the polymer solution.

[0038] 3) Connect the booster pump to the acid storage tank through a four-way valve, start the booster pump and inject acid into the core block to be tested, evaluate the deblocking effect of the acid on the polymer block based on the pressure and flow changes of the injection system before and after the injection of the acid, and evaluate the deblocking range of the acid on the oil field to be tested by measuring the diffusion range of the liquid in the cross section perpendicular to the three layered structures of the core block to be tested before and after the deblocking.

[0039] The working process for evaluating the flow direction trend of the fluid in the core within a certain area is as follows:

[0040] The booster pump is connected to the clean water storage tank through a four-way valve, and the booster pump is turned on to inject clean water into the core block to be tested. The flow direction of the fluid is sensed by the vibration receiving device, and the resistance change trend is obtained by the resistance measuring instrument, so as to qualitatively / quantitatively evaluate the flow direction trend of the fluid in the core in a certain area.

[0041] A core block to be tested is formed into a right triangular prism with a right-angled triangle bottom by stacking a core block taken from an injection well of the oil field to be tested and two core blocks taken from oil production wells of the oil field to be tested, and the core block of the injection well is located in the middle and the core blocks of the oil production well are located on both sides. The three layers of core blocks are arranged in sequence along one of the right-angled sides of the bottom of the right triangular prism. The relative positions of the core blocks of the oil production well and the core blocks of the water injection well are similar to the relative positions of the water injection wells and the oil production wells in the injection and production well network of the oil field. Therefore, the density of the underground rock of the oil field to be tested can be characterized by the density of the core block to be tested, and the density of the underground rock of the oil field to be tested can be characterized by the density of the core block to be tested. The injection effect of the block can characterize the injection effect of the oil field to be tested; the polymer liquid is injected into the core block to be tested by using a liquid injection system. When the liquid injection system reaches the equipment pressure limit, the polymer liquid cannot be injected, thereby simulating the contamination of the polymer to the oil field to be tested. When the polymer liquid cannot be injected, acid is injected into the core block to be tested, and the change in pressure and flow rate of the injection port and the production port can be used to quantitatively evaluate the unblocking effect of the core block to be tested, thereby reflecting the injection effect of the water injection well of the oil field to be tested, and then the reasonable amount of chemical agents used for unblocking can be determined. The device for evaluating the injection effect of water injection wells in the up-dip area of ​​the utility model can accurately evaluate the injection effect of water injection wells in the up-dip area, thereby accurately determining the reasonable amount of chemical agents used for unblocking.

Claims

1. A device for evaluating the effect of water injection wells in an up-dip area, characterized in that: The invention comprises a core plate to be tested, a physical model device, a liquid injection system, a liquid extraction system and a data acquisition system, wherein the core plate to be tested is formed by stacking three layers of core blocks in the shape of right prisms and the shape of the core block is a right triangular prism with a right-angled triangle bottom surface, the three layers of core blocks are arranged in sequence along one of the right-angled sides of the bottom surface of the right triangular prism, wherein the core block located in the middle is a core block taken from the injection well of the oil field to be tested, and the core blocks located on both sides are core blocks taken from the oil production well of the oil field to be tested, and a plurality of injection ports and a plurality of extraction ports are provided on the triangular bottom surface of the core plate to be tested, the injection ports are provided on the core block located in the middle, and the extraction ports are provided on the core blocks located on both sides; The physical model device is used to contain the core plate to be tested and to apply pressure on its surroundings and bottom. After the core block is placed in the physical model device, the side surface adjacent to one of the right-angled sides of the triangular bottom surface of the core block is parallel to the horizontal plane; the liquid injection system is used to inject unblocking liquid and polymer liquid into the core plate; the liquid extraction system is used to extract the liquid in the core plate; the data acquisition system is used to measure parameters used to evaluate the injection effect so as to determine the injection effect of the injection well of the oil field to be tested.

2. The device for evaluating the effect of water injection well in the up-dip area according to claim 1, characterized in that: The liquid injection system is also used to inject clean water into the core plate, and the data acquisition system is also used to measure the resistance value and flow direction of the liquid in the core block to be tested during the test.

3. The device for evaluating the effect of water injection well in the up-dip area according to claim 2, characterized in that: The liquid injection system includes an injection liquid conduit, one end of which is connected to the injection port of the core block to be tested, and the other end is connected to the outlet of the booster pump, and the inlet of the booster pump is switched to be connected to the unblocking liquid storage tank, the polymer storage tank and the clean water storage tank.

4. The device for evaluating the effect of water injection well in the up-dip area according to claim 1, characterized in that: The liquid production system comprises a plurality of production liquid conduits respectively connected to the production outlets of the core block to be tested, and the production liquid conduits are connected to the liquid drainage tank.

5. The device for evaluating the effect of water injection well in the up-dip area according to claim 1, characterized in that: The data acquisition system includes several flow meters and / or several pressure sensors, the flow meters are used to collect the flow rates of the injection port and the production port of the core block to be tested in the parameters, and the pressure sensors are used to collect the pressures of the injection port and the production port of the core block to be tested in the parameters.

6. The device for evaluating the effect of water injection well in the up-dip area according to claim 2, characterized in that: The data acquisition system comprises a plurality of vibration sensors, and the vibration sensors are used to detect vibration signals to obtain the flow direction of the liquid in the core block to be tested.

7. The device for evaluating the effect of water injection well in the up-dip area according to claim 6, characterized in that: The physical model device comprises a groove adapted to the shape and size of the core block to be tested and used to place the core plate to be tested, and a ring pressure device for applying pressure to the periphery and bottom of the core block to be tested is arranged in the groove.

8. The device for evaluating the effect of water injection well in the up-dip area according to claim 7, characterized in that: A bottom plate for mounting a vibration signal receiving probe of the vibration sensor is also provided at the bottom of the groove.

9. The device for evaluating the effect of water injection well in the up-dip area according to claim 7, characterized in that: The physical model device also includes a cover plate used to cover the upper surface of the core plate to be tested after it is placed in the groove.

10. The device for evaluating the effect of water injection well in the up-dip area according to claim 8, characterized in that: The inner surface of the groove is provided with an anti-corrosion film.

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