Device and method for evaluating combined packing effect of horizontal well sieve tube outer annulus and reservoir

Abstract

The invention discloses a horizontal well screen pipe outer annulus and reservoir combined packing effect evaluation device and method. Comprising the following steps: visualizing a tablet model; the perforated steel filter screen is horizontally and transversely arranged at the upper part of the accommodating space; the screen pipe is horizontally and transversely arranged in the steel filter screen with the holes; the first transverse pipe is horizontally and transversely arranged in the screen pipe; a first variable short section, a second variable short section and a third variable short section are detachably arranged at the upper part, the middle part and the lower part of the first transverse pipe respectively; the pair of rubber rings are arranged on the first transverse pipe in a sleeving mode and located on the two sides of the second variable short section. The second transverse pipe is positioned below the visual flat plate model; a fourth needle valve is arranged in the middle of the second transverse pipe; an injection device; and receiving the container. The device and the method have the beneficial effects that the distribution states of the annulus chemical packer and the reservoir chemical packer can be represented in real time, and the water-oil displacement path before and after chemical packing can be determined.

Description

Technical Field

[0001] The present invention relates to the technical field of offshore oilfield production, and in particular to a device and method for evaluating the isolation effect of a horizontal well screen outer annulus and reservoir combination. Background Art

[0002] Horizontal wells in offshore oil fields are mostly completed with screens for sand control. There are two challenges in controlling water in horizontal well sections: one is how to isolate the annulus between the screen and the wellbore to prevent horizontal crossflow of formation fluids in the annulus; the other is how to slow down the crossflow of formation fluids in the reservoir for horizontal wells without natural interlayers, so as to better maximize the effectiveness of staged production of horizontal wells. Focusing on the two aforementioned challenges, laboratory evaluation and simulation research is an urgent issue that needs to be addressed. Chinese Patent Publication No. CN214035624U relates to a full-scale visual screen annulus isolation test simulation device, which provides a means of evaluating the isolation effect of the annulus between the screen and the wellbore. However, it does not take into account reservoir crossflow conditions and is only applicable to the evaluation of staged production effects in horizontal wells with natural interlayers. For the vast majority of horizontal wells, there are no natural interlayers. Currently, there is no suitable simulation and evaluation device for evaluating the isolation effect of the screen annulus and reservoir combination in such horizontal wells. Summary of the Invention

[0003] The purpose of the present invention is to provide a device for evaluating the combined isolation effect of the annulus and reservoir outside the horizontal well screen, which can not only characterize the distribution status of the annulus chemical isolation agent and the reservoir chemical isolation agent in real time, but also can track the water-oil drive path before and after chemical isolation in real time, and has the characteristics of full process visualization.

[0004] To achieve the above object, the present invention adopts the following technical solutions, including:

[0005] A visual flat plate model has a rectangular accommodating space within it. A first and a second detachable perforated partition are longitudinally arranged side by side within the accommodating space. The first and second perforated partitions divide the accommodating space into a first permeable zone, a second permeable zone, and a third permeable zone from left to right. The first, second, and third permeable zones are each filled with oil-bearing quartz sand of different mesh sizes to simulate reservoirs with different permeabilities.

[0006] a perforated steel filter screen, horizontally arranged at the upper portion of the accommodation space, for simulating a well wall;

[0007] a screen pipe, which is horizontally arranged in the perforated steel filter screen;

[0008] A first transverse pipe is horizontally disposed in the screen tube, with a blind end; a first variable short section, a second variable short section, and a third variable short section are detachably disposed at the upper, middle, and lower portions of the first transverse pipe, respectively; the first transverse pipe is used to simulate an oil pipe;

[0009] a pair of rubber rings, which are respectively sleeved on the first transverse pipe and located on both sides of the second variable short section, and are used to simulate a packer to seal the annulus between the first transverse pipe and the screen pipe at the second variable short section;

[0010] A second transverse pipe is located below the visual flat plate model and is connected to the first permeation zone, the second permeation zone, and the third permeation zone of the visual flat plate model through a first needle valve, a second needle valve, and a third needle valve, respectively; both ends of the second transverse pipe are blind ends; a fourth needle valve is provided in the middle of the second transverse pipe;

[0011] an injection device, the outlet end of which can be selectively connected to the starting end of the first transverse pipe or the fourth needle valve, for injecting liquid into the first transverse pipe or the second transverse pipe;

[0012] a receiving container, which can be selectively connected to the fourth needle valve or the starting end of the first transverse pipe, and is used to receive the produced fluid from the second transverse pipe or the first transverse pipe;

[0013] Wherein, the first variable short section, the second variable short section, and the third variable short section are blind pipe short sections or perforated pipe short sections.

[0014] Preferably, the injection device comprises:

[0015] a servo pump, the inlet end of which is connected to a water source;

[0016] An intermediate container is arranged on one side of the servo pump, and the inlet end of the intermediate container is connected to the outlet end of the servo pump through a first connecting pipe; the outlet end of the intermediate container is selectively connected to the starting end of the first transverse pipe or the fourth needle valve through a second connecting pipe.

[0017] Preferably, a fifth needle valve and a sixth needle valve are provided on the first connecting pipe and the second connecting pipe, respectively.

[0018] Preferably, the visualization flat plate model is a high-strength box with a visualization window, the high-strength box consists of an upper pressure plate, a sand-filling frame and a lower pressure plate, the upper pressure plate has a visualization window, and the upper pressure plate, the sand-filling frame and the lower pressure plate are connected by screws and seals; the length × width × height of the visualization flat plate model are 300mm × 200mm × 100mm respectively.

[0019] Preferably, two slots are provided in the visualization flat panel model, and the first perforated partition plate and the second perforated partition plate are detachably arranged in the visualization flat panel model through the slots respectively.

[0020] Preferably, the inner diameter of the first transverse tube is 10 mm and the outer diameter is 14 mm; the inner diameter of the first variable short section, the second variable short section and the third variable short section are 10 mm and the outer diameter is 14 mm, and are connected to the first transverse tube by threads; the inner diameter of the screen tube is 20 mm, the outer diameter is 24 mm, and the pore size is 120 μm, 150 μm or 180 μm; the inner diameter of the perforated steel filter is 40 mm, the outer diameter is 44 mm, and the pore size is 60 μm, 70 μm or 80 μm; the pore size of the first perforated partition plate and the second perforated partition plate is 60 μm, 70 μm or 80 μm; the displacement of the servo pump is 1 to 100 mL / min, and the maximum injection pressure is 35 MPa.

[0021] The method for evaluating the isolation effect of the annulus and reservoir combination outside the screen tube of a horizontal well is applicable to any of the above-mentioned devices for evaluating the isolation effect of the annulus and reservoir combination outside the screen tube of a horizontal well, and comprises the following steps:

[0022] S1. Mix three types of quartz sand with different mesh sizes with crude oil at a mass ratio of 1:1, and then place them in the first permeable zone, the second permeable zone, and the third permeable zone, respectively, to simulate reservoirs with different permeabilities; the zone with the highest permeability among the first permeable zone, the second permeable zone, and the third permeable zone is designated as the high permeability zone, the zone with the lowest permeability among the first permeable zone, the second permeable zone, and the third permeable zone is designated as the low permeability zone, and the zone with an intermediate permeability among the first permeable zone, the second permeable zone, and the third permeable zone is designated as the medium permeability zone;

[0023] S2. Connect the outlet end of the injection device to the fourth needle valve; connect the receiving container to the starting end of the first transverse pipe; the first variable short section, the second variable short section, and the third variable short section on the first transverse pipe are all perforated pipe short sections; adjust the position of the first transverse pipe in the screen pipe so that the first variable short section, the second variable short section, and the third variable short section correspond to the first permeable zone, the second permeable zone, and the third permeable zone, respectively;

[0024] S3. Open the injection device to inject water into the second transverse pipe. The water from the injection device enters the first permeable zone, the second permeable zone, and the third permeable zone respectively through the first needle valve, the second needle valve, and the third needle valve. The water drives the crude oil in the first permeable zone, the second permeable zone, and the third permeable zone into the first transverse pipe through the first variable nipple, the second variable nipple, and the third variable nipple. The crude oil then enters the receiving container through the first transverse pipe. When the water content of the produced fluid in the receiving container reaches 98%, the produced oil volume is recorded and the water drive recovery factor is calculated.

[0025] S4, connecting the outlet end of the injection device to the starting end of the first transverse pipe; connecting the receiving container to the fourth needle valve; the first variable nipple, the second variable nipple, and the third variable nipple on the first transverse pipe are a blind pipe nipple, a perforated pipe nipple, and a blind pipe nipple, respectively;

[0026] S5. Load the chemical packing agent for the annulus outside the screen tube into the injection device, open the injection device, and inject the chemical packing agent for the annulus outside the screen tube through the second variable short joint into the annulus between the screen tube and the perforated steel filter screen corresponding to the junction of the second permeable zone and the third permeable zone. After the injection is completed, place the visual flat plate model at a constant temperature of 25 to 60° C. for 12 to 24 hours. After it is completely solidified, a lower screen tube annulus sealing rubber plug is formed in the annulus between the screen tube and the perforated steel filter screen corresponding to the junction of the second permeable zone and the third permeable zone;

[0027] S6. Move the first horizontal pipe upward, open the injection device again, and inject the chemical sealing agent of the outer annulus of the screen tube through the second variable short joint into the annulus between the corresponding screen tube and the perforated steel filter at the junction of the first permeable zone and the second permeable zone. After the injection is completed, place the visual flat plate model at a constant temperature of 25-60°C for 12-24 hours. After it is completely solidified, an upper outer annulus sealing plug of the screen tube is formed in the annulus between the corresponding screen tube and the perforated steel filter at the junction of the first permeable zone and the second permeable zone.

[0028] S7. Adjust the position of the first transverse pipe again, place a pair of rubber rings on the lower screen tube outer annulus isolation plug and the upper screen tube outer annulus isolation plug, set the variable nipples corresponding to the high permeability area as perforated pipe nipples, and set the variable nipples corresponding to the medium permeability area and the low permeability area as blind pipe nipples;

[0029] S8. Load the reservoir chemical sealing agent into the injection device, connect the injection device to the first cross pipe, open the injection device again, and inject the reservoir chemical sealing agent into the high permeability area. Then, place the visual evaluation device at a constant temperature of 50 to 80° C. for 12 to 24 hours to form a reservoir chemical sealing layer after complete reaction.

[0030] S9. Connect the outlet end of the injection device to the fourth needle valve; connect the receiving container to the starting end of the first transverse pipe; set the variable short section corresponding to the low permeability zone as a perforated pipe short section, and set the variable short sections corresponding to the high permeability zone and the medium permeability zone as blind pipe short sections; adjust the position of the first transverse pipe within the screen tube so that the first variable short section, the second variable short section, and the third variable short section correspond to the first permeability zone, the second permeability zone, and the third permeability zone, respectively;

[0031] S10. Open the injection device to inject water into the second transverse pipe. The water from the injection device enters the first permeable zone, the second permeable zone, and the third permeable zone respectively through the first needle valve, the second needle valve, and the third needle valve. The water drives the crude oil in the first permeable zone, the second permeable zone, and the third permeable zone into the first transverse pipe through the perforated pipe nipple in the low permeability zone. The crude oil then enters the receiving container through the first transverse pipe. When the water content of the produced fluid in the receiving container reaches 98%, the produced oil volume is recorded and the water drive recovery factor is calculated.

[0032] S11. Compare the water flooding recovery in S3 with the water flooding recovery in S10 to evaluate the isolation effect of the annulus outside the horizontal well screen and the reservoir combination;

[0033] Wherein, in the steps S3, S5, S8 and S10, the displacement of the injection device is 1 to 100 mL / min.

[0034] The beneficial effects of the present invention are that it can not only characterize the distribution status of the annular chemical isolation agent and the reservoir chemical isolation agent in real time, but also can track the water displacement oil path before and after the chemical isolation in real time, and has the characteristic of full process visualization. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 Schematic diagram of the device for evaluating the isolation effect of the annulus outside the screen tube and the reservoir combination of the horizontal well according to the present invention (chemical agent injection state).

[0036] Figure 2 Schematic diagram of the device for evaluating the isolation effect of the annulus outside the screen tube and the reservoir combination of the horizontal well according to the present invention (water injection state). DETAILED DESCRIPTION

[0037] The invention will be described in further detail below with reference to the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0038] It should be understood that terms such as “having”, “including” and “comprising” used herein do not exclude the existence or addition of one or other elements or combinations thereof.

[0039] like Figure 1-2 As shown, the device for evaluating the isolation effect of the annulus and reservoir combination of the horizontal well screen of the present invention comprises:

[0040] The visualization flat plate model 25 has a rectangular accommodating space inside, in which a removable first perforated partition 17 and a second perforated partition 23 are longitudinally arranged side by side. The first perforated partition 17 and the second perforated partition 23 divide the accommodating space into a first permeable area 14, a second permeable area 18 and a third permeable area 24 from left to right. The first permeable area 14, the second permeable area 18 and the third permeable area 24 are respectively filled with oil-bearing quartz sand of different mesh sizes for simulating reservoirs with different permeabilities. As a preferred embodiment, the visualization flat plate model is a high-strength box with a visualization window, and the high-strength box consists of an upper pressure plate, a sand-filling frame and a lower pressure plate. The upper pressure plate has a visualization window, and the upper pressure plate, the sand-filling frame and the lower pressure plate are connected by screws and seals. The length, width and height of the visualization flat plate model are 300mm×200mm×100mm respectively. As a further preferred embodiment, two slots are provided in the visualization flat plate model 25, and the first perforated partition 17 and the second perforated partition 23 are detachably provided in the visualization flat plate model 25 through the slots. As a further preferred embodiment, the apertures of the first perforated partition 17 and the second perforated partition 23 are 60 μm, 70 μm or 80 μm;

[0041] A perforated steel filter screen 8 is horizontally arranged at the upper part of the accommodation space to simulate the well wall; preferably, the perforated steel filter screen 8 has an inner diameter of 40 mm, an outer diameter of 44 mm, and a pore size of 60 μm, 70 μm, or 80 μm;

[0042] a sieve tube 7, which is horizontally arranged in the perforated steel filter screen 8; preferably, the sieve tube 7 has an inner diameter of 20 mm, an outer diameter of 24 mm, and a pore size of 120 μm, 150 μm, or 180 μm;

[0043] A first transverse tube 5 is horizontally disposed within the screen tube 7, with a blind end. A first variable nipple 6, a second variable nipple 10, and a third variable nipple 12 are detachably disposed at the upper, middle, and lower portions of the first transverse tube 5, respectively. The first transverse tube 5 is used to simulate an oil pipe. Preferably, the first transverse tube 5 has an inner diameter of 10 mm and an outer diameter of 14 mm. The first variable nipple 6, the second variable nipple 10, and the third variable nipple 12 also have inner diameters of 10 mm and outer diameters of 14 mm, and are connected to the first transverse tube 5 via threads.

[0044] A pair of rubber rings 9, which are respectively sleeved on the first transverse pipe 5 and located on both sides of the second variable short section 10, are used to simulate a packer to seal the annulus between the first transverse pipe 5 and the screen pipe 7 at the second variable short section 10;

[0045] A second transverse pipe 16 is located below the visual flat plate model 25 and is connected to the first permeation zone 14, the second permeation zone 18, and the third permeation zone 24 of the visual flat plate model 25 through a first needle valve 15, a second needle valve 21, and a third needle valve 22, respectively. Both ends of the second transverse pipe 16 are blind ends. A fourth needle valve 19 is provided in the middle of the second transverse pipe 16.

[0046] An injection device, whose outlet end can be selectively connected to the starting end of the first transverse pipe 5 or the fourth needle valve 19, is used to inject liquid into the first transverse pipe 5 or the second transverse pipe 16. Preferably, the injection device includes: a servo pump 1, whose inlet end is connected to a water source; an intermediate container 3, disposed on one side of the servo pump, the inlet end of the intermediate container 3 being connected to the outlet end of the servo pump 1 via a first connecting pipe; and the outlet end of the intermediate container 3 being selectively connected to the starting end of the first transverse pipe 5 or the fourth needle valve 19 via a second connecting pipe. Further preferably, a fifth needle valve 2 and a sixth needle valve 4 are respectively provided on the first connecting pipe and the second connecting pipe. Further preferably, the servo pump has a displacement of 1 to 100 mL / min and a maximum injection pressure of 35 MPa.

[0047] a receiving container 20, which can be selectively connected to the fourth needle valve 19 or the starting end of the first transverse pipe 5, and is used to receive the produced fluid from the second transverse pipe 16 or the first transverse pipe 5;

[0048] The first variable short section 6 , the second variable short section 10 and the third variable short section 12 are blind pipe short sections or perforated pipe short sections.

[0049] Example 1

[0050] The method for evaluating the isolation effect of the annulus and reservoir combination outside the screen tube of a horizontal well is applicable to any of the above-mentioned devices for evaluating the isolation effect of the annulus and reservoir combination outside the screen tube of a horizontal well, and comprises the following steps:

[0051] S1. Three types of quartz sand with different mesh sizes are mixed with crude oil at a mass ratio of 1:1, and then placed in the first permeable zone 14, the second permeable zone 18, and the third permeable zone 24, respectively; to simulate reservoirs with different permeabilities; the zone with the highest permeability among the first permeable zone 14, the second permeable zone 18, and the third permeable zone 24 is designated as the high permeability zone, the zone with the lowest permeability among the first permeable zone 14, the second permeable zone 18, and the third permeable zone 24 is designated as the low permeability zone, and the zone with an intermediate permeability among the first permeable zone 14, the second permeable zone 18, and the third permeable zone 24 is designated as the intermediate permeability zone;

[0052] S2. Connect the outlet end of the intermediate container 3 of the injection device to the fourth needle valve 19; connect the receiving container 20 to the starting end of the first transverse pipe 5; the first variable short section 6, the second variable short section 10, and the third variable short section 12 on the first transverse pipe 5 are all perforated pipe short sections; adjust the position of the first transverse pipe 5 in the screen pipe 7 so that the first variable short section 6, the second variable short section 10, and the third variable short section 12 correspond to the first permeable area 14, the second permeable area 18, and the third permeable area 24, respectively;

[0053] S3. Start the servo pump 1 in the injection device to inject water into the second transverse pipe 16. The displacement of the servo pump 1 of the injection device is 50 mL / min. The water from the injection device enters the first permeation zone 14, the second permeation zone 18, and the third permeation zone 24 respectively through the first needle valve 15, the second needle valve 21, and the third needle valve 22. The water drives the crude oil in the first permeation zone 14, the second permeation zone 18, and the third permeation zone 24 into the first transverse pipe 5 through the first variable nipple 6, the second variable nipple 10, and the third variable nipple 12. The crude oil then enters the receiving container 20 through the first transverse pipe 5. When the water content of the produced fluid in the receiving container 20 reaches 98%, the produced oil volume is recorded and the water drive recovery factor is calculated.

[0054] S4. Connect the outlet end of the intermediate container 3 of the injection device to the starting end of the first transverse pipe 5; connect the receiving container 20 to the fourth needle valve 19; the first variable nipple 6, the second variable nipple 10, and the third variable nipple 12 on the first transverse pipe 5 are a blind pipe nipple, a perforated pipe nipple, and a blind pipe nipple, respectively;

[0055] S5. Load the chemical packing agent for the annulus outside the sieve tube into the injection device, start the servo pump 1 in the injection device, and inject the chemical packing agent for the annulus outside the sieve tube through the second variable nipple 10 into the annulus between the sieve tube 7 and the perforated steel filter 8 corresponding to the junction of the second permeable area 18 and the third permeable area 24. The displacement of the servo pump 1 of the injection device is 50 mL / min. After the injection is completed, place the visual flat plate model 25 at a constant temperature of 40° C. for 18 hours. After it is completely solidified, a lower sieve tube annulus sealing plug is formed in the annulus between the sieve tube 7 and the perforated steel filter 8 corresponding to the junction of the second permeable area 18 and the third permeable area 24.

[0056] S6. Move the first transverse pipe 5 upward and start the servo pump 1 of the injection device again to inject the chemical sealing agent of the outer annulus of the screen tube through the second variable short joint 10 into the annulus between the screen tube 7 and the perforated steel filter 8 corresponding to the junction of the first permeable area 14 and the second permeable area 18. After the injection is completed, place the visual flat plate model 25 at a constant temperature of 50° C. for 18 hours. After it is completely solidified, an upper outer annulus sealing plug of the screen tube is formed in the annulus between the screen tube 7 and the perforated steel filter 8 corresponding to the junction of the first permeable area 14 and the second permeable area 18.

[0057] S7. Adjust the position of the first transverse pipe 5 again, place a pair of rubber rings 9 on the lower sieve tube outer annulus isolation rubber plug and the upper sieve tube outer annulus isolation rubber plug, set the variable short section corresponding to the high permeability area as a perforated pipe short section, and set the variable short section corresponding to the medium permeability area and the low permeability area as a blind pipe short section;

[0058] S8. Load the reservoir chemical sealing agent into the intermediate container 3 of the injection device, connect the intermediate container 3 of the injection device to the first transverse pipe 5, start the servo pump 1 in the injection device again, and set the displacement of the servo pump 1 of the injection device to 50 mL / min. Inject the reservoir chemical sealing agent into the high permeability area, and then place the visual evaluation device at a constant temperature of 65° C. for 18 hours to form a reservoir chemical sealing layer after complete reaction;

[0059] S9. Connect the outlet end of the intermediate container 3 of the injection device to the fourth needle valve 19; connect the receiving container 20 to the starting end of the first transverse pipe 5; set the variable short section corresponding to the low permeability zone as a perforated pipe short section, and set the variable short sections corresponding to the high permeability zone and the medium permeability zone as blind pipe short sections; adjust the position of the first transverse pipe 5 within the screen tube 7 so that the first variable short section 6, the second variable short section 10, and the third variable short section 12 correspond to the first permeability zone 14, the second permeability zone 18, and the third permeability zone 24, respectively;

[0060] S10. Turn on the servo pump 1 of the injection device to inject water into the second transverse pipe 16. The displacement of the servo pump 1 of the injection device is 50 mL / min. The water from the injection device enters the first permeable area 14, the second permeable area 18, and the third permeable area 24 respectively through the first needle valve 15, the second needle valve 21, and the third needle valve 22. The water drives the crude oil in the first permeable area 14, the second permeable area 18, and the third permeable area 24 into the first transverse pipe 5 through the perforated pipe nipple in the low permeability area; then, the crude oil enters the receiving container 20 through the first transverse pipe 5. When the water content of the produced fluid in the receiving container 20 reaches 98%, the produced oil volume is recorded and the water drive recovery factor is calculated.

[0061] S11. Compare the water flooding recovery factor in S3 with that in S10 to evaluate the isolation effect of the annulus outside the horizontal well screen and the reservoir combination.

[0062] Example 2

[0063] The method for evaluating the isolation effect of the annulus and reservoir combination outside the screen tube of a horizontal well is applicable to any of the above-mentioned devices for evaluating the isolation effect of the annulus and reservoir combination outside the screen tube of a horizontal well, and comprises the following steps:

[0064] S1. Three types of quartz sand with different mesh sizes are mixed with crude oil at a mass ratio of 1:1, and then placed in the first permeable zone 14, the second permeable zone 18, and the third permeable zone 24, respectively; to simulate reservoirs with different permeabilities; the zone with the highest permeability among the first permeable zone 14, the second permeable zone 18, and the third permeable zone 24 is designated as the high permeability zone, the zone with the lowest permeability among the first permeable zone 14, the second permeable zone 18, and the third permeable zone 24 is designated as the low permeability zone, and the zone with an intermediate permeability among the first permeable zone 14, the second permeable zone 18, and the third permeable zone 24 is designated as the intermediate permeability zone;

[0065] S2. Connect the outlet end of the intermediate container 3 of the injection device to the fourth needle valve 19; connect the receiving container 20 to the starting end of the first transverse pipe 5; the first variable short section 6, the second variable short section 10, and the third variable short section 12 on the first transverse pipe 5 are all perforated pipe short sections; adjust the position of the first transverse pipe 5 in the screen pipe 7 so that the first variable short section 6, the second variable short section 10, and the third variable short section 12 correspond to the first permeable area 14, the second permeable area 18, and the third permeable area 24, respectively;

[0066] S3. Start the servo pump 1 in the injection device to inject water into the second transverse pipe 16. The displacement of the servo pump 1 of the injection device is 1 mL / min. The water from the injection device enters the first permeation zone 14, the second permeation zone 18, and the third permeation zone 24 respectively through the first needle valve 15, the second needle valve 21, and the third needle valve 22. The water drives the crude oil in the first permeation zone 14, the second permeation zone 18, and the third permeation zone 24 into the first transverse pipe 5 through the first variable nipple 6, the second variable nipple 10, and the third variable nipple 12. The crude oil then enters the receiving container 20 through the first transverse pipe 5. When the water content of the produced fluid in the receiving container 20 reaches 98%, the produced oil volume is recorded and the water flooding recovery factor is calculated.

[0067] S4. Connect the outlet end of the intermediate container 3 of the injection device to the starting end of the first transverse pipe 5; connect the receiving container 20 to the fourth needle valve 19; the first variable nipple 6, the second variable nipple 10, and the third variable nipple 12 on the first transverse pipe 5 are a blind pipe nipple, a perforated pipe nipple, and a blind pipe nipple, respectively;

[0068] S5. Load the chemical packing agent for the annulus outside the screen tube into the injection device, start the servo pump 1 in the injection device, and inject the chemical packing agent for the annulus outside the screen tube through the second variable short joint 10 into the annulus between the screen tube 7 and the perforated steel filter screen 8 corresponding to the junction of the second permeable area 18 and the third permeable area 24. The displacement of the servo pump 1 of the injection device is 100 mL / min. After the injection is completed, the visual flat plate model 25 is placed at a constant temperature of 60° C. for 12 hours. After it is completely solidified, a lower screen tube annulus sealing plug is formed in the annulus between the screen tube 7 and the perforated steel filter screen 8 corresponding to the junction of the second permeable area 18 and the third permeable area 24.

[0069] S6. Move the first transverse pipe 5 upward and start the servo pump 1 of the injection device again to inject the chemical sealing agent of the outer annulus of the screen tube through the second variable short joint 10 into the annulus between the screen tube 7 and the perforated steel filter 8 corresponding to the junction of the first permeable area 14 and the second permeable area 18. After the injection is completed, place the visual flat plate model 25 at a constant temperature of 25° C. for 24 hours. After it is completely solidified, an upper outer annulus sealing plug of the screen tube is formed in the annulus between the screen tube 7 and the perforated steel filter 8 corresponding to the junction of the first permeable area 14 and the second permeable area 18.

[0070] S7. Adjust the position of the first transverse pipe 5 again, place a pair of rubber rings 9 on the lower sieve tube outer annulus isolation rubber plug and the upper sieve tube outer annulus isolation rubber plug, set the variable short section corresponding to the high permeability area as a perforated pipe short section, and set the variable short section corresponding to the medium permeability area and the low permeability area as a blind pipe short section;

[0071] S8. Load the reservoir chemical sealing agent into the intermediate container 3 of the injection device, connect the intermediate container 3 of the injection device to the first transverse pipe 5, start the servo pump 1 in the injection device again, and set the displacement of the servo pump 1 of the injection device to 1 mL / min. Inject the reservoir chemical sealing agent into the high permeability area, and then place the visual evaluation device at a constant temperature of 50° C. for 24 hours to form a reservoir chemical sealing layer after complete reaction;

[0072] S9. Connect the outlet end of the intermediate container 3 of the injection device to the fourth needle valve 19; connect the receiving container 20 to the starting end of the first transverse pipe 5; set the variable short section corresponding to the low permeability zone as a perforated pipe short section, and set the variable short sections corresponding to the high permeability zone and the medium permeability zone as blind pipe short sections; adjust the position of the first transverse pipe 5 within the screen tube 7 so that the first variable short section 6, the second variable short section 10, and the third variable short section 12 correspond to the first permeability zone 14, the second permeability zone 18, and the third permeability zone 24, respectively;

[0073] S10. Turn on the servo pump 1 of the injection device to inject water into the second transverse pipe 16. The displacement of the servo pump 1 of the injection device is 100 mL / min. The water from the injection device passes through the first needle valve 15, the second needle valve 21, and the third needle valve 22 and enters the first permeable area 14, the second permeable area 18, and the third permeable area 24, respectively. The water drives the crude oil in the first permeable area 14, the second permeable area 18, and the third permeable area 24 into the first transverse pipe 5 through the perforated pipe nipple in the low permeability area; then, the crude oil enters the receiving container 20 through the first transverse pipe 5. When the water content of the produced fluid in the receiving container 20 reaches 98%, the produced oil volume is recorded and the water drive recovery factor is calculated.

[0074] S11. Compare the water flooding recovery factor in S3 with that in S10 to evaluate the isolation effect of the annulus outside the horizontal well screen and the reservoir combination.

[0075] Example 3

[0076] The method for evaluating the isolation effect of the annulus and reservoir combination outside the screen tube of a horizontal well is applicable to any of the above-mentioned devices for evaluating the isolation effect of the annulus and reservoir combination outside the screen tube of a horizontal well, and comprises the following steps:

[0077] S1. Three types of quartz sand with different mesh sizes are mixed with crude oil at a mass ratio of 1:1, and then placed in the first permeable zone 14, the second permeable zone 18, and the third permeable zone 24, respectively; to simulate reservoirs with different permeabilities; the zone with the highest permeability among the first permeable zone 14, the second permeable zone 18, and the third permeable zone 24 is designated as the high permeability zone, the zone with the lowest permeability among the first permeable zone 14, the second permeable zone 18, and the third permeable zone 24 is designated as the low permeability zone, and the zone with an intermediate permeability among the first permeable zone 14, the second permeable zone 18, and the third permeable zone 24 is designated as the intermediate permeability zone;

[0078] S2. Connect the outlet end of the intermediate container 3 of the injection device to the fourth needle valve 19; connect the receiving container 20 to the starting end of the first transverse pipe 5; the first variable short section 6, the second variable short section 10, and the third variable short section 12 on the first transverse pipe 5 are all perforated pipe short sections; adjust the position of the first transverse pipe 5 in the screen pipe 7 so that the first variable short section 6, the second variable short section 10, and the third variable short section 12 correspond to the first permeable area 14, the second permeable area 18, and the third permeable area 24, respectively;

[0079] S3. Start the servo pump 1 in the injection device to inject water into the second transverse pipe 16. The displacement of the servo pump 1 of the injection device is 100 mL / min. The water from the injection device enters the first permeation zone 14, the second permeation zone 18, and the third permeation zone 24 respectively through the first needle valve 15, the second needle valve 21, and the third needle valve 22. The water drives the crude oil in the first permeation zone 14, the second permeation zone 18, and the third permeation zone 24 into the first transverse pipe 5 through the first variable nipple 6, the second variable nipple 10, and the third variable nipple 12. The crude oil then enters the receiving container 20 through the first transverse pipe 5. When the water content of the produced fluid in the receiving container 20 reaches 98%, the produced oil volume is recorded and the water drive recovery factor is calculated.

[0080] S4. Connect the outlet end of the intermediate container 3 of the injection device to the starting end of the first transverse pipe 5; connect the receiving container 20 to the fourth needle valve 19; the first variable nipple 6, the second variable nipple 10, and the third variable nipple 12 on the first transverse pipe 5 are a blind pipe nipple, a perforated pipe nipple, and a blind pipe nipple, respectively;

[0081] S5. Load the chemical packing agent for the annulus outside the screen tube into the injection device, start the servo pump 1 in the injection device, and inject the chemical packing agent for the annulus outside the screen tube through the second variable short joint 10 into the annulus between the screen tube 7 and the perforated steel filter screen 8 corresponding to the junction of the second permeable area 18 and the third permeable area 24. The displacement of the servo pump 1 of the injection device is 1 mL / min. After the injection is completed, place the visual flat plate model 25 at a constant temperature of 25° C. for 24 hours. After it is completely solidified, a lower screen tube annulus sealing plug is formed in the annulus between the screen tube 7 and the perforated steel filter screen 8 corresponding to the junction of the second permeable area 18 and the third permeable area 24.

[0082] S6. Move the first transverse pipe 5 upward and start the servo pump 1 of the injection device again to inject the chemical sealing agent of the outer annulus of the screen tube through the second variable short joint 10 into the annulus between the screen tube 7 and the perforated steel filter 8 corresponding to the junction of the first permeable area 14 and the second permeable area 18. After the injection is completed, place the visual flat plate model 25 at a constant temperature of 60° C. for 12 hours. After it is completely solidified, an upper outer annulus sealing plug of the screen tube is formed in the annulus between the screen tube 7 and the perforated steel filter 8 corresponding to the junction of the first permeable area 14 and the second permeable area 18.

[0083] S7. Adjust the position of the first transverse pipe 5 again, place a pair of rubber rings 9 on the lower sieve tube outer annulus isolation rubber plug and the upper sieve tube outer annulus isolation rubber plug, set the variable short section corresponding to the high permeability area as a perforated pipe short section, and set the variable short section corresponding to the medium permeability area and the low permeability area as a blind pipe short section;

[0084] S8. Load the reservoir chemical sealing agent into the intermediate container 3 of the injection device, connect the intermediate container 3 of the injection device to the first transverse pipe 5, restart the servo pump 1 in the injection device, and set the displacement of the servo pump 1 of the injection device to 100 mL / min. Inject the reservoir chemical sealing agent into the high permeability area, and then place the visual evaluation device at a constant temperature of 80° C. for 12 hours to form a reservoir chemical sealing layer after complete reaction;

[0085] S9. Connect the outlet end of the intermediate container 3 of the injection device to the fourth needle valve 19; connect the receiving container 20 to the starting end of the first transverse pipe 5; set the variable short section corresponding to the low permeability zone as a perforated pipe short section, and set the variable short sections corresponding to the high permeability zone and the medium permeability zone as blind pipe short sections; adjust the position of the first transverse pipe 5 within the screen tube 7 so that the first variable short section 6, the second variable short section 10, and the third variable short section 12 correspond to the first permeability zone 14, the second permeability zone 18, and the third permeability zone 24, respectively;

[0086] S10. Turn on the servo pump 1 of the injection device to inject water into the second transverse pipe 16. The displacement of the servo pump 1 of the injection device is 1 mL / min. The water from the injection device enters the first permeable area 14, the second permeable area 18, and the third permeable area 24 respectively through the first needle valve 15, the second needle valve 21, and the third needle valve 22. The water drives the crude oil in the first permeable area 14, the second permeable area 18, and the third permeable area 24 into the first transverse pipe 5 through the perforated pipe nipple in the low permeability area; then, the crude oil enters the receiving container 20 through the first transverse pipe 5. When the water content of the produced fluid in the receiving container 20 reaches 98%, the produced oil volume is recorded and the water drive recovery factor is calculated.

[0087] S11. Compare the water flooding recovery factor in S3 with that in S10 to evaluate the isolation effect of the annulus outside the horizontal well screen and the reservoir combination.

[0088] Comparative Example 1

[0089] The method for evaluating the isolation effect of the annulus outside the screen and the reservoir combination in a horizontal well includes the following steps:

[0090] S1. Three types of quartz sand with different mesh sizes are mixed with crude oil at a mass ratio of 1:1, and then placed in the first permeable zone 14, the second permeable zone 18, and the third permeable zone 24, respectively; to simulate reservoirs with different permeabilities; the zone with the highest permeability among the first permeable zone 14, the second permeable zone 18, and the third permeable zone 24 is designated as the high permeability zone, the zone with the lowest permeability among the first permeable zone 14, the second permeable zone 18, and the third permeable zone 24 is designated as the low permeability zone, and the zone with an intermediate permeability among the first permeable zone 14, the second permeable zone 18, and the third permeable zone 24 is designated as the intermediate permeability zone;

[0091] S2. Connect the outlet end of the intermediate container 3 of the injection device to the fourth needle valve 19; connect the receiving container 20 to the starting end of the first transverse pipe 5; the first variable short section 6, the second variable short section 10, and the third variable short section 12 on the first transverse pipe 5 are all perforated pipe short sections; adjust the position of the first transverse pipe 5 in the screen pipe 7 so that the first variable short section 6, the second variable short section 10, and the third variable short section 12 correspond to the first permeable area 14, the second permeable area 18, and the third permeable area 24, respectively;

[0092] S3. Start the servo pump 1 in the injection device to inject water into the second transverse pipe 16. The displacement of the servo pump 1 of the injection device is 50 mL / min. The water from the injection device enters the first permeation zone 14, the second permeation zone 18, and the third permeation zone 24 respectively through the first needle valve 15, the second needle valve 21, and the third needle valve 22. The water drives the crude oil in the first permeation zone 14, the second permeation zone 18, and the third permeation zone 24 into the first transverse pipe 5 through the first variable nipple 6, the second variable nipple 10, and the third variable nipple 12. The crude oil then enters the receiving container 20 through the first transverse pipe 5. When the water content of the produced fluid in the receiving container 20 reaches 98%, the produced oil volume is recorded and the water drive recovery factor is calculated.

[0093] S4. Connect the outlet end of the intermediate container 3 of the injection device to the starting end of the first transverse pipe 5; connect the receiving container 20 to the fourth needle valve 19; the first variable nipple 6, the second variable nipple 10, and the third variable nipple 12 on the first transverse pipe 5 are a blind pipe nipple, a perforated pipe nipple, and a blind pipe nipple, respectively;

[0094] S5. Load the chemical packing agent for the annulus outside the sieve tube into the injection device, start the servo pump 1 in the injection device, and inject the chemical packing agent for the annulus outside the sieve tube through the second variable nipple 10 into the annulus between the sieve tube 7 and the perforated steel filter 8 corresponding to the junction of the second permeable area 18 and the third permeable area 24. The displacement of the servo pump 1 of the injection device is 50 mL / min. After the injection is completed, place the visual flat plate model 25 at a constant temperature of 40° C. for 18 hours. After it is completely solidified, a lower sieve tube annulus sealing plug is formed in the annulus between the sieve tube 7 and the perforated steel filter 8 corresponding to the junction of the second permeable area 18 and the third permeable area 24.

[0095] S6. Move the first transverse pipe 5 upward and start the servo pump 1 of the injection device again to inject the chemical sealing agent of the outer annulus of the screen tube through the second variable short joint 10 into the annulus between the screen tube 7 and the perforated steel filter 8 corresponding to the junction of the first permeable area 14 and the second permeable area 18. After the injection is completed, place the visual flat plate model 25 at a constant temperature of 40° C. for 18 hours. After it is completely solidified, an upper outer annulus sealing plug of the screen tube is formed in the annulus between the screen tube 7 and the perforated steel filter 8 corresponding to the junction of the first permeable area 14 and the second permeable area 18.

[0096] S7. Adjust the position of the first transverse pipe 5 again, place a pair of rubber rings 9 on the lower sieve tube outer annulus isolation rubber plug and the upper sieve tube outer annulus isolation rubber plug, set the variable short section corresponding to the high permeability area as a perforated pipe short section, and set the variable short section corresponding to the medium permeability area and the low permeability area as a blind pipe short section;

[0097] S8. Connect the outlet end of the intermediate container 3 of the injection device to the fourth needle valve 19; connect the receiving container 20 to the starting end of the first transverse pipe 5; set the variable short section corresponding to the low permeability zone as a perforated pipe short section, and set the variable short sections corresponding to the high permeability zone and the medium permeability zone as blind pipe short sections; adjust the position of the first transverse pipe 5 within the screen tube 7 so that the first variable short section 6, the second variable short section 10, and the third variable short section 12 correspond to the first permeability zone 14, the second permeability zone 18, and the third permeability zone 24, respectively;

[0098] S9. Turn on the servo pump 1 of the injection device to inject water into the second transverse pipe 16. The displacement of the servo pump 1 of the injection device is 50 mL / min. The water from the injection device enters the first permeable area 14, the second permeable area 18, and the third permeable area 24 respectively through the first needle valve 15, the second needle valve 21, and the third needle valve 22. The water drives the crude oil in the first permeable area 14, the second permeable area 18, and the third permeable area 24 into the first transverse pipe 5 through the perforated pipe nipple in the low permeability area; then, the crude oil enters the receiving container 20 through the first transverse pipe 5. When the water content of the produced fluid in the receiving container 20 reaches 98%, the produced oil volume is recorded and the water drive recovery factor is calculated.

[0099] S10. Compare the water flooding recovery factor in S3 with that in S9 to evaluate the isolation effect of the annulus outside the horizontal well screen and the reservoir combination.

[0100] Comparative Example 2

[0101] A method for evaluating the isolation effect of an annulus and reservoir combination outside a horizontal well screen is applicable to any of the above-mentioned devices for evaluating the isolation effect of an annulus and reservoir combination outside a horizontal well screen, comprising the following steps: S1, mixing three types of quartz sand of different mesh sizes with crude oil at a mass ratio of 1:1, and then placing them in a first permeable area 14, a second permeable area 18, and a third permeable area 24, respectively; for simulating reservoirs with different permeabilities; the area with the highest permeability among the first permeable area 14, the second permeable area 18, and the third permeable area 24 is defined as a high permeability area, the area with the lowest permeability among the first permeable area 14, the second permeable area 18, and the third permeable area 24 is defined as a low permeability area, and the area with an intermediate permeability among the first permeable area 14, the second permeable area 18, and the third permeable area 24 is defined as a medium permeability area;

[0102] S2. Connect the outlet end of the intermediate container 3 of the injection device to the fourth needle valve 19; connect the receiving container 20 to the starting end of the first transverse pipe 5; the first variable short section 6, the second variable short section 10, and the third variable short section 12 on the first transverse pipe 5 are all perforated pipe short sections; adjust the position of the first transverse pipe 5 in the screen pipe 7 so that the first variable short section 6, the second variable short section 10, and the third variable short section 12 correspond to the first permeable area 14, the second permeable area 18, and the third permeable area 24, respectively;

[0103] S3. Start the servo pump 1 in the injection device to inject water into the second transverse pipe 16. The displacement of the servo pump 1 of the injection device is 50 mL / min. The water from the injection device enters the first permeation zone 14, the second permeation zone 18, and the third permeation zone 24 respectively through the first needle valve 15, the second needle valve 21, and the third needle valve 22. The water drives the crude oil in the first permeation zone 14, the second permeation zone 18, and the third permeation zone 24 into the first transverse pipe 5 through the first variable nipple 6, the second variable nipple 10, and the third variable nipple 12. The crude oil then enters the receiving container 20 through the first transverse pipe 5. When the water content of the produced fluid in the receiving container 20 reaches 98%, the produced oil volume is recorded and the water drive recovery factor is calculated.

[0104] S4. Connect the outlet end of the intermediate container 3 of the injection device to the starting end of the first transverse pipe 5; connect the receiving container 20 to the fourth needle valve 19; the first variable nipple 6, the second variable nipple 10, and the third variable nipple 12 on the first transverse pipe 5 are a blind pipe nipple, a perforated pipe nipple, and a blind pipe nipple, respectively;

[0105] S5. Adjust the position of the first transverse pipe 5 again, and place the pair of rubber rings 9 between the junction of the second permeable area 18 and the third permeable area 24 and the junction of the first permeable area 14 and the second permeable area 18, respectively. Set the variable short sections corresponding to the high permeability area as perforated pipe short sections, and set the variable short sections corresponding to the medium permeability area and the low permeability area as blind pipe short sections.

[0106] S6. Load the reservoir chemical sealing agent into the intermediate container 3 of the injection device, connect the intermediate container 3 of the injection device to the first transverse pipe 5, start the servo pump 1 in the injection device again, and set the displacement of the servo pump 1 of the injection device to 50 mL / min. Inject the reservoir chemical sealing agent into the high permeability area, and then place the visual evaluation device at a constant temperature of 65° C. for 18 hours to form a reservoir chemical sealing layer after complete reaction;

[0107] S7. Connect the outlet end of the intermediate container 3 of the injection device to the fourth needle valve 19; connect the receiving container 20 to the starting end of the first transverse pipe 5; set the variable short section corresponding to the low permeability zone as a perforated pipe short section, and set the variable short sections corresponding to the high permeability zone and the medium permeability zone as blind pipe short sections; adjust the position of the first transverse pipe 5 within the screen tube 7 so that the first variable short section 6, the second variable short section 10, and the third variable short section 12 correspond to the first permeability zone 14, the second permeability zone 18, and the third permeability zone 24, respectively;

[0108] S8. Turn on the servo pump 1 of the injection device to inject water into the second transverse pipe 16. The displacement of the servo pump 1 of the injection device is 50 mL / min. The water from the injection device passes through the first needle valve 15, the second needle valve 21, and the third needle valve 22 into the first permeable zone 14, the second permeable zone 18, and the third permeable zone 24, respectively. The water drives the crude oil in the first permeable zone 14, the second permeable zone 18, and the third permeable zone 24 into the first transverse pipe 5 through the perforated pipe nipple in the low permeability zone; then, the crude oil enters the receiving container 20 through the first transverse pipe 5. When the water content of the produced fluid in the receiving container 20 reaches 98%, the produced oil volume is recorded and the water flooding recovery factor is calculated.

[0109] S9. Compare the water drive recovery factor in S3 with that in S8 to evaluate the isolation effect of the annulus outside the horizontal well screen and the reservoir combination.

[0110] Data Analysis

[0111] The water flooding recovery rates in Examples 1-3 and Comparative Examples 1-2 were calculated, and the results are shown in Table 1.

[0112] Table 1

[0113] Water flooding recovery rate in step S3 % Final water flooding recovery % Example 1 32.71 48.36 Example 2 30.34 47.88 Example 3 33.95 48.97 Comparative Example 1 32.12 35.46 Comparative Example 2 33.09 38.22

[0114] It can be seen from Table 1 that the isolation effect evaluation method of the horizontal well screen annulus and reservoir combination of the present application has a higher yield.

[0115] In summary, the device for evaluating the combined isolation effect of the annulus and reservoir outside the horizontal well screen of the present invention can not only characterize the distribution status of the annular chemical isolation agent and the reservoir chemical isolation agent in real time, but also can track the water-to-oil drive path before and after chemical isolation in real time, and has the characteristic of full-process visualization.

[0116] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the description and implementation methods. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A device for evaluating the isolation effect of the annulus and reservoir combination outside the horizontal well screen, characterized in that: include: A visual flat plate model has a rectangular accommodating space within it. A first and a second detachable perforated partition are longitudinally arranged side by side within the accommodating space. The first and second perforated partitions divide the accommodating space into a first permeable zone, a second permeable zone, and a third permeable zone from left to right. The first, second, and third permeable zones are each filled with oil-bearing quartz sand of different mesh sizes to simulate reservoirs with different permeabilities. a perforated steel filter screen, horizontally arranged at the upper portion of the accommodation space, for simulating a well wall; a screen pipe, which is horizontally arranged in the perforated steel filter screen; A first transverse pipe is horizontally disposed in the screen tube, with a blind end; a first variable short section, a second variable short section, and a third variable short section are detachably disposed at the upper, middle, and lower portions of the first transverse pipe, respectively; the first transverse pipe is used to simulate an oil pipe; a pair of rubber rings, which are respectively sleeved on the first transverse pipe and located on both sides of the second variable short section, and are used to simulate a packer to seal the annulus between the first transverse pipe and the screen pipe at the second variable short section; A second transverse pipe is located below the visual flat plate model and is connected to the first permeation zone, the second permeation zone, and the third permeation zone of the visual flat plate model through a first needle valve, a second needle valve, and a third needle valve, respectively; both ends of the second transverse pipe are blind ends; a fourth needle valve is provided in the middle of the second transverse pipe; an injection device, the outlet end of which can be selectively connected to the starting end of the first transverse pipe or the fourth needle valve, for injecting liquid into the first transverse pipe or the second transverse pipe; a receiving container, which can be selectively connected to the fourth needle valve or the starting end of the first transverse pipe, and is used to receive the produced fluid from the second transverse pipe or the first transverse pipe; Wherein, the first variable short section, the second variable short section, and the third variable short section are blind pipe short sections or perforated pipe short sections.

2. The device for evaluating the isolation effect of the annulus and reservoir combination outside the horizontal well screen according to claim 1, characterized in that: The injection device comprises: a servo pump, the inlet end of which is connected to a water source; An intermediate container is arranged on one side of the servo pump, and the inlet end of the intermediate container is connected to the outlet end of the servo pump through a first connecting pipe; the outlet end of the intermediate container is selectively connected to the starting end of the first transverse pipe or the fourth needle valve through a second connecting pipe.

3. The device for evaluating the isolation effect of the annulus and reservoir combination outside the horizontal well screen according to claim 2, characterized in that: A fifth needle valve and a sixth needle valve are respectively provided on the first connecting pipe and the second connecting pipe.

4. The device for evaluating the isolation effect of the annulus and reservoir combination outside the horizontal well screen according to claim 2, characterized in that: The visualization flat plate model is a high-strength box with a visualization window. The high-strength box consists of an upper pressing plate, a sand-filling frame and a lower pressing plate. The upper pressing plate has a visualization window. The upper pressing plate, the sand-filling frame and the lower pressing plate are connected by screws and seals. The length, width and height of the visualization flat plate model are 300mm×200mm×100mm respectively.

5. The device for evaluating the isolation effect of the annulus and reservoir combination outside the horizontal well screen according to claim 4, characterized in that: Two card slots are provided in the visualization flat panel model, and the first perforated partition plate and the second perforated partition plate are detachably arranged in the visualization flat panel model through the card slots respectively.

6. The device for evaluating the isolation effect of the annulus and reservoir combination outside the horizontal well screen according to claim 5, characterized in that: The inner diameter of the first transverse tube is 10 mm, and the outer diameter is 14 mm; the inner diameter of the first variable short section, the second variable short section and the third variable short section are 10 mm, and the outer diameter is 14 mm, and they are connected to the first transverse tube by threads; the inner diameter of the screen tube is 20 mm, the outer diameter is 24 mm, and the pore size is 120 μm, 150 μm or 180 μm; the inner diameter of the perforated steel filter is 40 mm, the outer diameter is 44 mm, and the pore size is 60 μm, 70 μm or 80 μm; the pore size of the first perforated partition plate and the second perforated partition plate is 60 μm, 70 μm or 80 μm; the displacement of the servo pump is 1 to 100 mL / min, and the maximum injection pressure is 35 MPa.

7. A method for evaluating the isolation effect of a combination of annulus and reservoir outside a horizontal well screen, applicable to the device for evaluating the isolation effect of a combination of annulus and reservoir outside a horizontal well screen according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1. Mix three types of quartz sand with different mesh sizes with crude oil at a mass ratio of 1:1, and then place them in the first permeable zone, the second permeable zone, and the third permeable zone, respectively, to simulate reservoirs with different permeabilities; the zone with the highest permeability among the first permeable zone, the second permeable zone, and the third permeable zone is designated as the high permeability zone, the zone with the lowest permeability among the first permeable zone, the second permeable zone, and the third permeable zone is designated as the low permeability zone, and the zone with an intermediate permeability among the first permeable zone, the second permeable zone, and the third permeable zone is designated as the medium permeability zone; S2. Connect the outlet end of the injection device to the fourth needle valve; connect the receiving container to the starting end of the first transverse pipe; the first variable short section, the second variable short section, and the third variable short section on the first transverse pipe are all perforated pipe short sections; adjust the position of the first transverse pipe in the screen pipe so that the first variable short section, the second variable short section, and the third variable short section correspond to the first permeable zone, the second permeable zone, and the third permeable zone, respectively; S3. Open the injection device to inject water into the second transverse pipe. The water from the injection device enters the first permeable zone, the second permeable zone, and the third permeable zone respectively through the first needle valve, the second needle valve, and the third needle valve. The water drives the crude oil in the first permeable zone, the second permeable zone, and the third permeable zone into the first transverse pipe through the first variable nipple, the second variable nipple, and the third variable nipple. The crude oil then enters the receiving container through the first transverse pipe. When the water content of the produced fluid in the receiving container reaches 98%, the produced oil volume is recorded and the water drive recovery factor is calculated. S4, connecting the outlet end of the injection device to the starting end of the first transverse pipe; connecting the receiving container to the fourth needle valve; the first variable nipple, the second variable nipple, and the third variable nipple on the first transverse pipe are a blind pipe nipple, a perforated pipe nipple, and a blind pipe nipple, respectively; S5. Load the chemical packing agent for the annulus outside the screen tube into the injection device, open the injection device, and inject the chemical packing agent for the annulus outside the screen tube through the second variable short joint into the annulus between the screen tube and the perforated steel filter screen corresponding to the junction of the second permeable zone and the third permeable zone. After the injection is completed, place the visual flat plate model at a constant temperature of 25 to 60° C. for 12 to 24 hours. After it is completely solidified, a lower screen tube annulus sealing rubber plug is formed in the annulus between the screen tube and the perforated steel filter screen corresponding to the junction of the second permeable zone and the third permeable zone; S6. Move the first horizontal pipe upward, open the injection device again, and inject the chemical sealing agent of the outer annulus of the screen tube through the second variable short joint into the annulus between the corresponding screen tube and the perforated steel filter at the junction of the first permeable zone and the second permeable zone. After the injection is completed, place the visual flat plate model at a constant temperature of 25-60°C for 12-24 hours. After it is completely solidified, an upper outer annulus sealing plug of the screen tube is formed in the annulus between the corresponding screen tube and the perforated steel filter at the junction of the first permeable zone and the second permeable zone. S7. Adjust the position of the first transverse pipe again, place a pair of rubber rings on the lower screen tube outer annulus isolation plug and the upper screen tube outer annulus isolation plug, set the variable nipples corresponding to the high permeability area as perforated pipe nipples, and set the variable nipples corresponding to the medium permeability area and the low permeability area as blind pipe nipples; S8. Load the reservoir chemical sealing agent into the injection device, connect the injection device to the first cross pipe, open the injection device again, and inject the reservoir chemical sealing agent into the high permeability area. Then, place the visual evaluation device at a constant temperature of 50 to 80° C. for 12 to 24 hours to form a reservoir chemical sealing layer after complete reaction. S9. Connect the outlet end of the injection device to the fourth needle valve; connect the receiving container to the starting end of the first transverse pipe; set the variable short section corresponding to the low permeability zone as a perforated pipe short section, and set the variable short sections corresponding to the high permeability zone and the medium permeability zone as blind pipe short sections; adjust the position of the first transverse pipe within the screen tube so that the first variable short section, the second variable short section, and the third variable short section correspond to the first permeability zone, the second permeability zone, and the third permeability zone, respectively; S10. Open the injection device to inject water into the second transverse pipe. The water from the injection device enters the first permeable zone, the second permeable zone, and the third permeable zone respectively through the first needle valve, the second needle valve, and the third needle valve. The water drives the crude oil in the first permeable zone, the second permeable zone, and the third permeable zone into the first transverse pipe through the perforated pipe nipple in the low permeability zone. The crude oil then enters the receiving container through the first transverse pipe. When the water content of the produced fluid in the receiving container reaches 98%, the produced oil volume is recorded and the water drive recovery factor is calculated. S11. Compare the water flooding recovery in S3 with the water flooding recovery in S10 to evaluate the isolation effect of the annulus outside the horizontal well screen and the reservoir combination; Wherein, in the steps S3, S5, S8 and S10, the displacement of the injection device is 1 to 100 mL / min.

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