Heavy oil fire flooding horizontal section experimental equipment and its use method

Abstract

The present invention provides a heavy oil fire drive horizontal section experimental device and a method of using the same, which relates to the technical field of heavy oil extraction and is used to prevent the termination of the fire drive experiment. The heavy oil fire drive horizontal section experimental device comprises a main structure, a connection structure and a length adjustment structure connected in sequence; the main structure comprises a shell with an opening at one end and a first production pipe, a plugging member and a packing member slidably installed in the shell, the circumference of the shell is provided with a first sieve hole, and the circumference of the first production pipe is provided with a second sieve hole; the plugging member is used to plug the first production pipe; the packing member is used to plug the gap between the plugging member and the shell; the length adjustment structure comprises a fixedly connected center pipe and a threaded pipe, the threaded pipe is sleeved on the center pipe; the center pipe is connected to the first production pipe and is coaxial with the center pipe, and the threaded pipe is threadedly connected with a rotating handle; when the rotating handle rotates relative to the threaded pipe, the center pipe moves along the axial direction of the threaded pipe driven by the threaded pipe.

Description

Technical Field

[0001] The invention relates to the technical field of heavy oil production, and in particular to heavy oil fire drive horizontal section experimental equipment and a use method thereof. Background Art

[0002] Fire drive for heavy oil production has a high sampling rate and a wide range of applications. However, due to the complex domestic reservoir conditions, strong reservoir heterogeneity, and large differences in heavy oil properties, heavy oil fire drive is still in the pilot experimental stage. Experiments are used to provide guidance for field applications and adjustment of measures in oil fields.

[0003] The principle of the fire drive experiment is to inject air or oxygen into the oil layer and ignite the oil layer to form a fire line. As the fire line continues to extend, the oil layer can be divided into a burned area, a burning area, an oil-rich area and a crude oil area. The viscosity of the heavy oil in the oil-rich area decreases due to temperature heating and the fluidity is strong. The heavy oil in the oil-rich area is then collected through the horizontal section of the three-dimensional well network.

[0004] However, the fire line in the above fire drive experiment easily spreads to the horizontal section of the three-dimensional well network, causing the fire drive experiment to be terminated. Summary of the invention

[0005] The embodiment of the present invention provides a heavy oil fire drive horizontal section experimental device and a use method thereof, which are used to prevent the fire drive experiment from being terminated.

[0006] To achieve the above objectives, the embodiments of the present invention provide the following technical solutions:

[0007] An embodiment of the present invention provides a heavy oil fire flooding horizontal section experimental device on the one hand, comprising a main structure, a connection structure and a length adjustment structure connected in sequence;

[0008] The main structure comprises a first production pipe, a plugging member, a packing member and a shell with an opening at one end, wherein the first production pipe, the plugging member and the packing member are all slidably installed in the shell, the circumference of the shell is provided with a first sieve hole, and the circumference of the first production pipe is provided with a second sieve hole;

[0009] One end of the plugging member is fixedly connected to an end of the first production pipe away from the opening, and the other end of the plugging member is located outside the first production pipe; the plugging member is used to plug the gap between the plugging member and the shell;

[0010] The length adjustment structure comprises a fixedly connected central tube and a threaded tube, wherein the threaded tube is sleeved on the central tube; the central tube is connected to the first production tube, the central tube and the first production tube have the same center line, and the threaded tube is threadedly connected with a rotating handle;

[0011] The central tube is configured such that when the rotating handle rotates relative to the threaded tube, the central tube moves along the axial direction of the threaded tube driven by the threaded tube.

[0012] The heavy oil fire flooding horizontal section experimental equipment provided by the embodiment of the present invention has the following beneficial effects:

[0013] When using the heavy oil fire drive horizontal section experimental equipment to conduct a fire drive experiment, the connection structure is installed on the experimental box. Since the main structure includes a shell with an opening at one end, a first production pipe is slidably installed in the shell, and the circumference of the shell is provided with a first sieve hole, and the circumference of the first production pipe is provided with a second sieve hole, the heavy oil in the oil-rich area can enter the first production pipe. Since one end of the plugging piece is fixedly connected to the end of the first production pipe away from the opening, the heavy oil can flow out toward the above opening, thereby realizing the collection of the heavy oil.

[0014] In addition, since the first production pipe, the plugging piece and the packing piece are all slidably installed in the shell, the first production pipe, the plugging piece and the packing piece can adjust their positions in the shell as the fire drive experiment proceeds. When the rotating handle threadedly connected to the threaded pipe rotates relative to the threaded pipe, the rotating handle drives the threaded pipe to move along the axial direction of the threaded pipe. Since the threaded pipe is sleeved on the center pipe, the threaded pipe and the center pipe are fixedly connected, and then the center pipe is driven to move along the axial direction of the threaded pipe through the threaded pipe. Since the center pipe is fixedly connected to the first production pipe and the center pipe and the first production pipe are on the same center line, the center pipe can drive the first production pipe, the plugging piece and the packing piece to move along the axial direction of the threaded pipe.

[0015] When the leading edge of the fire line of the fire drive burns to the first sieve hole, the position of the packing is adjusted by turning the handle to move the packing to the side of the first sieve hole close to the turning handle. At this time, since the packing blocks the gap between the packing and the shell, the packing is fixedly connected to the end of the first production pipe away from the opening, so that the two sides of the packing are respectively the collected heavy oil and the high-temperature gas in the fire line, thereby achieving isolation of the heavy oil and the high-temperature gas and avoiding damage to the horizontal section.

[0016] Based on the above technical solution, the embodiment of the present invention can also be improved as follows.

[0017] Furthermore, the sealing member and the shell are both in the shape of circular tubes, the portion of the sealing member located outside the first production pipe is in the shape of a cylinder, the outer circumferential surface of the sealing member is completely fitted against the inner wall of the shell, and the portion of the sealing member located outside the first production pipe is completely fitted against the inner circumferential surface of the sealing member.

[0018] Furthermore, the outer circumferential surface of the sealing member is provided with a plurality of protrusions at intervals in the circumferential direction, and the inner circumferential surface of the shell is provided with a plurality of grooves at intervals in the circumferential direction, and each of the protrusions is slidably installed in each of the grooves.

[0019] Further, the housing includes a closed joint, a two-way joint, a first tube body and a second tube body;

[0020] The closed joint is an end of the shell away from the opening, the closed joint is threadedly connected to the first end of the two-way joint, and a gasket is installed between the closed joint and the two-way joint;

[0021] The first end of the first tube body is threadedly connected to the second end of the two-way joint, the second end of the first tube body is threadedly connected to the second tube body, and the first sieve holes are arranged on the circumference of the second tube body.

[0022] Further, the central tube includes a first central tube and a second central tube, and the first central tube and the second central tube are respectively threadedly connected to the inner circumferential surfaces at both ends of the first connecting joint;

[0023] The threaded tube is sleeved on the second center tube, and the threaded tube is fixedly connected to the first connecting joint through a positioning joint. The first end of the positioning joint is threadedly connected to the outer circumferential surface of the first connecting joint, and the second end of the positioning joint is threadedly connected to the threaded tube.

[0024] Furthermore, a connecting flange is provided at one end of the threaded pipe away from the main structure, a first through hole and a first threaded hole are provided on the connecting flange, and the threaded pipe is slidably installed in the first through hole;

[0025] A screw with a length scale is installed in the first threaded hole, one end of the screw is threadedly connected to the first threaded hole, and the other end is threadedly connected to a connecting piece, and the connecting piece is clamped on the connecting structure.

[0026] Further, the connection structure includes a second connection joint, a second production pipe, a fixing member inside the box and a fixing member outside the box;

[0027] The second connection joint is clamped in the mounting hole of the experimental box, and the external fixing piece and the internal fixing piece are respectively threadedly connected to two ends of the second connection joint; the internal fixing piece is fixedly installed on the inner wall of the experimental box, and the external fixing piece is fixedly installed on the outer wall of the experimental box;

[0028] The second connecting joint, the fixing part inside the box body and the fixing part outside the box body are all hollow components. The second production pipe is inserted into the second connecting joint, the fixing part outside the box body and the fixing part inside the box body. One end of the second production pipe is threadedly connected to the first production pipe, and the other end is threadedly connected to the center pipe.

[0029] Furthermore, a first rubber member is disposed in the fixing member in the box body, and is characterized in that the first rubber member is disposed in the fixing member in the box body, and the first rubber member completely fills a gap between the second production pipe and the fixing member in the box body.

[0030] Furthermore, two second rubber members and washers are arranged in the fixing member outside the box body, and the two second rubber members and washers completely fill the gap between the second production pipe and the fixing member outside the box body, and the two second rubber members are arranged on both sides of the washers respectively;

[0031] The connection structure also includes an outer flange on the box body, which is provided with a second through hole, and the outer fixing piece on the box body is provided with a second threaded hole, the center lines of the second through hole and the second threaded hole are parallel to the axial direction of the threaded pipe, the outer flange on the box body and the outer fixing piece on the box body are fixed by bolts passing through the second through hole and the second threaded hole, and a flange gasket is also installed between the outer flange on the box body and the outer fixing piece on the box body.

[0032] Another aspect of the present invention provides a method for using a heavy oil fire drive horizontal section experimental device, which is applied to the heavy oil fire drive horizontal section experimental device in any of the above schemes. The method for using the heavy oil fire drive horizontal section experimental device comprises the following steps:

[0033] The heavy oil fire drive horizontal section experimental equipment is installed in an experimental box through the connecting structure of the heavy oil fire drive horizontal section experimental equipment, and a heating system, a pumping system, a data acquisition and analysis system, and a produced material collection and analysis system are connected outside the experimental box;

[0034] Filling the oil sand made by mixing heavy oil and quartz stone into the experimental box;

[0035] Performing a sealing test on the test box and the heavy oil fire flooding horizontal section test equipment, and heating the oil sand to a design temperature through the heating system after the sealing test is passed;

[0036] Air is injected into the test box through the pumping system to ignite the oil sands, and the oil sands begin to burn to form a burned area, a burning area, an oil-rich area and a crude oil area. The dividing line between the burning area and the oil-rich area is the front end of the fire line, and the dividing line between the oil-rich area and the crude oil area is the flow front end;

[0037] The physical field data in the experimental box is read by the data acquisition and analysis system, the produced material is analyzed by the produced material collection and analysis system, and the position of the flow front end is determined by combining the physical field data and the analysis data of the produced material;

[0038] Rotate the rotating handle in the heavy oil fire drive horizontal section experimental equipment, the rotating handle drives the threaded pipe, the center pipe, the second production pipe, the first production pipe, the plugging member and the packing member in the heavy oil fire drive horizontal section experimental equipment to move along the axial direction of the threaded pipe, and ensure that the front end of the fire line and the front end of the flow are respectively located on both sides of the packing member;

[0039] Repeat the determination of the flow front position and the adjustment of the rotating handle until the experiment is finished.

[0040] Since the method for using a heavy oil fire drive horizontal section experimental device provided by the present invention is applied to the heavy oil fire drive horizontal section experimental device in any of the above schemes, the method for using the heavy oil fire drive horizontal section experimental device has the same beneficial effects as the heavy oil fire drive horizontal section experimental device, which will not be repeated here.

[0041] In addition to the technical problems solved by the embodiments of the present invention described above, the technical features constituting the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions, other technical problems that can be solved by the heavy oil fire flooding horizontal section experimental equipment and the use method thereof provided by the embodiments of the present invention, other technical features included in the technical solutions, and the beneficial effects brought about by these technical features will be further described in detail in the specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the drawings required for use in the embodiments or related technical descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0043] Figure 1 A schematic diagram of the structure of a heavy oil fire flooding horizontal section experimental device provided in an embodiment of the present invention;

[0044] Figure 2 A cross-sectional schematic diagram of a main structure provided by an embodiment of the present invention;

[0045] Figure 3 A schematic diagram of the structure of the length adjustment structure provided by an embodiment of the present invention;

[0046] Figure 4 for Figure 3 A magnified cross-sectional view of area A in FIG.

[0047] Figure 5 A schematic diagram of the structure of a packing member provided in an embodiment of the present invention;

[0048] Figure 6A structural schematic diagram of a connection structure provided in an embodiment of the present invention.

[0049] Description of reference numerals:

[0050] 100-main structure, 200-connection structure;

[0051] 300-length adjustment structure, 110-first production pipe;

[0052] 111 - second sieve hole, 120 - blocking member;

[0053] 130-packing member, 140-housing;

[0054] 141 - first sieve hole, 142 - closed joint;

[0055] 143-bidirectional joint 144-first tube body;

[0056] 145 - second tube body, 210 - second connecting joint;

[0057] 220 - second production pipe, 230 - fixing member in the box body;

[0058] 240 - a fixing member outside the box, 250 - a first rubber member;

[0059] 260 - second rubber member, 270 - gasket;

[0060] 280-external flange of the casing, 310-center tube;

[0061] 311-first central tube, 312-second central tube;

[0062] 320-threaded pipe, 330-turn handle;

[0063] 340-first connecting joint, 350-positioning joint;

[0064] 360-connecting flange, 370-screw;

[0065] 380-Connectors. DETAILED DESCRIPTION

[0066] In the fire drive experiment in the related art, the fire line is easy to run into the horizontal section of the three-dimensional well network, so that the fire drive experiment is terminated. The inventors have found through research and analysis that the reason for this problem is that the high-temperature gas in the fire line enters the horizontal section, causing the high-temperature gas to contact with the collected heavy oil in the oil-rich area, which in turn causes the heavy oil to burn and damage the horizontal section.

[0067] In order to solve the above technical problems, in the heavy oil fire drive horizontal section experimental equipment provided by the embodiment of the present invention, a first production pipe, a plugging member and a packing member are slidably arranged in the shell, and the first production pipe, the plugging member and the packing member are driven to move in the shell by rotating the handle, and the high-temperature gas and the collected heavy oil in the oil-rich area are isolated by the packing member, thereby preventing the heavy oil from burning and causing the fire drive experiment to be terminated.

[0068] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0069] like Figure 1 As shown, the heavy oil fire drive horizontal section experimental equipment provided by the embodiment of the present invention includes a main structure 100, a connection structure 200 and a length adjustment structure 300 connected in sequence. The main structure 100 is used to collect heavy oil in the oil-rich area. When conducting a fire drive experiment, the heavy oil fire drive horizontal section experimental equipment is fixed to the experimental box through the connection structure 200. The length adjustment structure 300 is used to drive the first production pipe 110, the plugging member 120 and the sealing member 130 in the main structure 100 to move in the shell 140 of the main structure 100.

[0070] like Figure 1 and Figure 2 As shown, the main structure 100 includes a first production pipe 110, a plugging member 120, a packing member 130 and a shell 140 with an opening at one end, and the first production pipe 110, the plugging member 120 and the packing member 130 are slidably installed in the shell 140. In other words, a sliding cavity is provided in the shell 140, and the first production pipe 110, the plugging member 120 and the packing member 130 are installed in the sliding cavity in the shell 140.

[0071] The first sieve hole 141 is arranged on the circumference of the shell 140, and the second sieve hole 111 is also arranged on the circumference of the first production pipe 110. The heavy oil in the oil-rich area can enter the first production pipe 110 through the first sieve hole 141 and the second sieve hole 111 in sequence, thereby realizing the collection of the heavy oil. The shell 140 and the first production pipe 110 can be in the shape of a circular tube or a nearly circular tube. In the embodiment of the present invention, as shown in FIG. Figure 1 As shown, the shell 140 and the first production pipe 110 are in the shape of a circular tube. The shell 140 and the first production pipe 110 can be made of stainless steel.

[0072] The plugging member 120 is used to plug one end of the first production pipe 110. One end of the plugging member 120 is fixedly connected to one end of the first production pipe 110 away from the opening of the shell 140, and the other end of the plugging member 120 is located outside the first production pipe 110. In other words, the first part of the plugging member 120 is located inside the first production pipe 110 to achieve plugging of the first production pipe, and the second part is located outside the first production pipe 110 to cooperate with the packing member 130 to prevent high-temperature gas from passing through the second sieve hole 111 and entering the first production pipe 110. The shape of the first part of the plugging member 120 matches the shape of the space inside the first production pipe 110. In the embodiment of the present invention, the first production pipe 110 is a round tube, and the shape of the first part of the plugging member 120 is cylindrical. The shape of the second part of the plugging member 120 can be cylindrical, approximately cylindrical, long strip, or approximately long strip. In the embodiment of the present invention, the shape of the second part of the plugging member 120 is cylindrical.

[0073] The packing 130 is used to cooperate with the second part of the plugging member 120 to prevent the high-temperature gas from entering the first production pipe 110 through the second sieve hole 111. The specific structure of the packing 130 matches the shell 140 and the second part of the plugging member 120. For example, when the shell 140 is in the shape of a circular tube and the second part of the plugging member 120 is in the shape of a cylinder, the packing 130 is in the shape of a circular tube, and the outer circumferential surface of the packing 130 is completely attached to the inner wall of the shell 140, and the outer circumferential surface of the second part of the plugging member 120 is completely attached to the inner circumferential surface of the packing 130. In other words, the packing 130 completely fills the gap between the plugging member 120 and the first production pipe 110. The material of the packing 130 can be a high-temperature resistant material, such as metal copper.

[0074] like Figure 1 and Figure 3 As shown, the length adjustment structure 300 includes a central tube 310 and a threaded tube 320, the central tube 310 is fixedly connected to the threaded tube 320, and the threaded tube 320 is sleeved on the central tube 310. The central tube 310 is connected to the first production tube 110, and the central tube 310 and the first production tube 110 are coaxial. The central tube 310 is used to extend the first production tube 110, and the heavy oil in the oil-rich area collected in the first production tube 110 flows out through the central tube 310. The material of the central tube 310 can be stainless steel, and the shape can be a round tube or a nearly round tube. In the embodiment of the present invention, the shape of the central tube 310 is a round tube.

[0075] As an example, Figure 3 and Figure 4 As shown, the central tube 310 includes a first central tube 311 and a second central tube 312, and the first central tube 311 and the second central tube 312 are respectively threadedly connected to the inner circumference of both ends of the first connecting joint 340. Figure 3 and Figure 4 Taking the position shown as an example, both ends of the first connection joint 340 are provided with internal threads, the first center tube 311 is connected to the internal threads at the left end of the first connection joint 340, and the second center tube 312 is connected to the internal threads at the right end of the first connection joint 340. The threaded tube 320 is sleeved on the second center tube 312.

[0076] The threaded tube 320 is fixedly connected to the first connection joint 340 through the positioning joint 350, the first end of the inner positioning joint 350 is threadedly connected to the outer peripheral surface of the first connection joint 340, and the second end of the positioning joint 350 is threadedly connected to the threaded tube 320. Figure 3 Taking the shown orientation as an example, the left end of the first connecting joint 340 is provided with an external thread, the positioning joint 350 is a round tube with an internal thread on the inner wall, the left end external thread of the first connecting joint 340 is connected to the left end internal thread of the positioning joint 350, and the threaded tube 320 is threadedly connected to the right end internal thread of the positioning joint 350.

[0077] The threaded tube 320 is used to drive the center tube 310 to move along the axial direction of the threaded tube 310. The outer peripheral surface of the threaded tube 320 is provided with threads, and the threaded tube 320 is threadedly connected with a rotating handle 330. During the fire drive experiment, when the high-temperature gas in the fire line approaches the first sieve hole, the rotating handle 330 is controlled to rotate relative to the threaded tube 320, so that the threaded tube 320 moves along its own axial direction, thereby driving the center tube 310 to move along the axial direction of the threaded tube 320. At the same time, since the center tube 310 is connected with the first production tube 110, and the center tube 310 is aligned with the center line of the first production tube 110, the center tube 310 drives the first production tube 110, the plugging member 120 and the isolation member 130 to move in the shell 140 to the side of the first sieve hole 141 close to the threaded tube 320. After the high-temperature gas enters the shell 140 through the first sieve hole 141, the high-temperature gas cannot enter the first production pipe 110 through the second sieve hole 111 because the sealing member 130 blocks the gap between the sealing member 120 and the shell 140. Compared with the related art, the heavy oil fire drive horizontal section experimental equipment provided by the embodiment of the present invention can prevent the high-temperature gas from contacting the heavy oil collected in the oil-rich area, prevent the heavy oil from burning in the horizontal section, and prevent the fire drive experiment from being terminated.

[0078] Based on the above embodiments, Figure 5As shown, the outer circumferential surface of the packing 130 is provided with a plurality of protrusions at intervals in the circumferential direction, and the inner circumferential surface of the shell 140 is provided with a plurality of grooves at intervals in the circumferential direction. The number of the protrusions and the grooves is the same, and both can be three, four or five. In the embodiment of the present invention, the number of the protrusions and the grooves are both four, and each protrusion is correspondingly slidably installed in each groove. Such a configuration makes the connection between the packing 130 and the shell 140 more secure, and avoids the rotation of the packing along its own axial direction, thereby improving the connection tightness of the heavy oil fire drive horizontal section experimental equipment.

[0079] In some embodiments, Figure 1 and Figure 2 As shown, the housing 140 includes a closed joint 142, a two-way joint 143, a first tube 144 and a second tube 145. The closed joint 142 is an end of the housing 140 away from the opening, or in other words, the closed joint 142 is a blind end of the housing 140.

[0080] The two-way joint 143 is a fastener between the closed joint and the first tube body 144. Figure 2 Taking the position shown as an example, the closed joint 142 is threadedly connected to the left end of the two-way joint 143, and a gasket is installed between the closed joint 142 and the two-way joint 143. The gasket can be a high-temperature resistant rubber gasket or a high-temperature resistant stainless steel gasket, which further increases the structural strength of the connection between the closed joint 142 and the two-way joint 143. The left end of the first tube body 144 is threadedly connected to the right end of the two-way joint 143, and the right end of the first tube body 144 is threadedly connected to the left end of the second tube body 145. The circumferential surface of the second tube body 142 is provided with a first sieve hole 141. The material of the two-way joint 143, the first tube body 144 and the second tube body 145 can all be stainless steel, and the shape of the first tube body 144 and the second tube body 145 can both be round tubes. The shell 140 is designed as a split structure, which is convenient for adjusting the length of the first tube body 144 and the second tube body 145 according to experimental requirements. Furthermore, based on the above embodiment, multiple first tube bodies 144, second tube bodies 145 or a combination of the first tube body 144 and the second tube body 145 can be added to the right end of the second tube body 145 to facilitate adjustment of the position and number of the first sieve holes 141 according to different experimental requirements.

[0081] In some embodiments, Figure 3 As shown, the length adjustment member 300 also includes a connecting flange 360, a screw rod 370 and a connecting piece 380. The connecting flange 360 ​​is provided with a first through hole and a first threaded hole. The threaded tube 320 is slidably installed in the first through hole, and the screw rod 370 is installed in the first threaded hole.

[0082] The screw 370 is marked with a length scale. One end of the screw 370 is threadedly connected to the first threaded hole, and the other end is threadedly connected to the connector 380. The connector 380 is clamped on the connection structure 200. For example, the connector 380 can be clamped on the step portion of the outer fixing member 240 of the box body in the connection structure 200 described below. Since both ends of the screw 370 are fastened by threads, when the threaded pipe 320 moves along its own axial direction, the threaded pipe 320 moves in the first through hole. By recording the length scales corresponding to the threaded pipe 320 before and after the movement on the screw 370, the moving distance of the threaded pipe 320 can be obtained, and then the moving distance of the threaded pipe 320 along its own axial direction can be obtained, so as to guide the actual heavy oil fire drive production.

[0083] As an example, Figure 6 As shown, the connection structure 200 includes a second connection joint 210, a second production pipe 220, a fixing member 230 inside the box, and a fixing member 240 outside the box. The two ends of the connection joint 200 are respectively connected to the main structure 100 and the length adjustment structure 300. Specifically, one end of the second production pipe 220 is connected to the first production pipe 110 in the main structure 100, and the other end is connected to the central pipe 310 in the length adjustment structure 300. When the fire flooding experiment is performed, the connection structure 200 is fixedly installed on the experimental box.

[0084] The second connection joint 210, the fixing member 230 inside the box and the fixing member 240 outside the box are all hollow components, and the second production pipe 220 is inserted into the second connection joint, the fixing member 230 outside the box and the fixing member 240 inside the box. Both ends of the second connection joint 210 are provided with threads, and the shape of the middle part of the second connection joint 210 is the same as the shape of the mounting hole of the test box. Taking the embodiment of the present invention as an example, the shape of the middle part of the second connection joint is cylindrical, which is clamped on the circular mounting hole, and the fixing member 230 inside the box and the fixing member 240 outside the box are respectively threadedly connected to the two ends of the second connection joint 210. Among them, the fixing member 230 inside the box is fixedly installed on the inner wall of the test box, and the fixing member 240 outside the box is fixedly installed on the outer wall of the test box. When conducting a fire drive experiment, tighten the fixing member 230 inside the box and the fixing member 240 outside the box respectively, so that the fixing member 230 inside the box and the fixing member 240 outside the box are respectively pressed on the inner wall and the outer wall of the box, and then the connection structure 200 is fixedly installed on the test box.

[0085] A first rubber member 250 is provided inside the fixing member 230 in the box body. The first rubber member 250 completely fills the gap between the fixing member 230 in the box body and the second production pipe 220. During the fire drive experiment, due to the pressure in the test box, the pressure in the test box squeezes the first rubber member 250, so that the second production pipe 220 is connected to the fixing member 230 in the box body, thereby strengthening the tightness of the connection between the second production pipe 220 and the fixing member 230 in the box body.

[0086] Two second rubber members 260 and a gasket 270 are arranged inside the outer fixing member 240 of the box body. The two second rubber members 260 and the gasket 270 completely fill the gap between the outer fixing member 240 of the box body and the second production pipe 220. The two second rubber members 260 are arranged on both sides of the gasket 270. The material of the gasket 270 can be rubber or stainless steel. A step portion is arranged on the circumferential surface of the outer fixing member 240 of the box body, and the step portion can be used for clamping the connector 380. The outer flange 280 of the box body is crimped on the outer fixing member 240 of the box body. The outer flange 280 of the box body is a plate-like structure. A second through hole is arranged on the outer flange of the box body. A second threaded hole is arranged on the outer fixing member 240 of the box body. The number of the second through holes and the second threaded holes can be four, six or eight. Taking the present invention as an example, the number of the second through holes and the second threaded holes are both six.

[0087] The center lines of the second through hole and the second threaded hole are parallel to the axial direction of the threaded pipe, and the outer flange 280 of the casing is fixed to the outer fixing piece 240 of the casing by bolts passing through the second through hole and the second threaded hole. When conducting a fire drive experiment, since the outside of the casing is at standard atmospheric pressure, the atmosphere outside the casing cannot squeeze the second rubber piece 260, so the outer flange 280 of the casing and the outer fixing piece 240 of the casing are fixed by bolts, and the bolts provide thread pre-tightening force to support and squeeze the two second rubber pieces 260 and the gasket 270, thereby strengthening the tightness of the connection between the second production pipe 220 and the outer fixing piece 240 of the casing. In addition, a flange gasket is installed between the outer flange 280 of the casing and the outer fixing piece 240 of the casing to further strengthen the tightness of the connection between the second production pipe 220 and the outer fixing piece 240 of the casing.

[0088] The embodiment of the present invention further provides a method for using a heavy oil fire drive horizontal section experimental device, which is applied to the heavy oil fire drive horizontal section experimental device in any of the above schemes. The method for using the heavy oil fire drive horizontal section experimental device comprises the following steps:

[0089] The heavy oil fire flooding horizontal section experimental equipment is installed in the experimental box through the connecting structure 200, and the heating system, pumping system, data acquisition and analysis system and produced material collection and analysis system are connected outside the experimental box;

[0090] Specifically, the second connection joint 210 in the connection structure 200 is clamped in the installation hole of the test box, the box internal fixing piece 230 is threadedly connected to one end of the second connection joint 210 in the box, and the box internal fixing piece 230 is tightened to press the box internal fixing frame against the inner wall of the box; the box external fixing piece 240 is threadedly connected to one end of the second connection joint 210 outside the box, and the box external fixing piece 240 is tightened to press the box external fixing piece 240 against the outer wall of the box. The second production pipe 220 is passed through the box external fixing piece 240, the second connection joint 210 and the box internal fixing piece in sequence, and the main structure 100 is connected to the end of the second production pipe 220 located in the box, and the length adjustment structure is connected to the end of the second production pipe 220 located outside the box, so as to realize the installation of the heavy oil fire drive horizontal section experimental equipment and the test box.

[0091] The heating system, pumping system, data acquisition and analysis system and produced material collection and analysis system can be connected to the experimental box by electrical connection, pipeline connection, signal connection or any combination thereof.

[0092] The oil sand made by mixing heavy oil and quartz stone is filled into the experimental box;

[0093] Conduct a sealing test on the test box and the heavy oil fire flooding horizontal section test equipment. After the sealing test is qualified, the oil sand is heated to the design temperature through the heating system;

[0094] The sealing test can be carried out by inputting air into the test box and the heavy oil fire drive horizontal section test equipment, and using air pressure equipment such as an air tightness tester to test whether the air pressure in the test box and the heavy oil fire drive horizontal section test equipment meets the sealing requirements of the experiment.

[0095] Air is injected into the test box through the pumping system to ignite the oil sands, which start to burn, forming a burned area, a burning area, an oil-rich area and a crude oil area. The dividing line between the burning area and the oil-rich area is the front end of the fire line, and the dividing line between the oil-rich area and the crude oil area is the flow front end.

[0096] The ignition temperature of oil sand is related to specific experimental requirements. Taking the present invention as an example, the ignition temperature is 300°C.

[0097] The physical field data in the experimental box is read through the data acquisition and analysis system, the produced materials are analyzed through the produced materials collection and analysis system, and the position of the flow front is determined by combining the physical field data and the produced materials analysis data;

[0098] The physical field data includes the temperature data and pressure data in the experimental box. The data acquisition and analysis system can collect the physical field data through sensors and then analyze the data through industrial software. The produced material refers to the heavy oil in the oil-rich area collected by the heavy oil fire drive horizontal section experimental equipment. The produced material collection and analysis system can analyze and judge the viscosity, temperature and other characteristics of the heavy oil in the oil-rich area.

[0099] The rotating handle 330 in the heavy oil fire drive horizontal section experimental device is rotated, and the rotating handle 330 drives the threaded pipe 320, the center pipe 310, the second production pipe 220, the first production pipe 110, the plugging member 120 and the packing member 130 in the heavy oil fire drive horizontal section experimental device to move along the axial direction of the threaded pipe 320 to ensure that the front end of the fire line and the front end of the flow are respectively located on both sides of the packing member 130;

[0100] Since the front end of the fire line and the front end of the flow are respectively located on both sides of the isolation member 130, the heavy oil in the oil-rich area can enter the first production pipe 110, but the high-temperature gas at the front end of the fire line cannot enter the first production pipe 110 due to the obstruction of the isolation member 130, thereby avoiding the combustion of the horizontal section of the heavy oil.

[0101] Repeat the judgment of the flow front position and the adjustment of the handle 330 until the experiment is finished. The position of the packing 130 is continuously adjusted by rotating the handle 330 to ensure that the high-temperature gas does not contact the heavy oil collected in the oil-rich area, avoid the combustion of the heavy oil in the horizontal section, and prevent the termination of the fire drive experiment.

[0102] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0103] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0104] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A heavy oil fire flooding horizontal section experimental equipment, characterized in that: It includes a main structure, a connection structure and a length adjustment structure which are connected in sequence; The main structure comprises a first production pipe, a plugging member, a packing member and a shell with an opening at one end, wherein the first production pipe, the plugging member and the packing member are all slidably installed in the shell, the circumference of the shell is provided with a first sieve hole, and the circumference of the first production pipe is provided with a second sieve hole; One end of the plugging member is fixedly connected to an end of the first production pipe away from the opening, and the other end of the plugging member is located outside the first production pipe; the plugging member is used to plug the gap between the plugging member and the shell; The length adjustment structure comprises a fixedly connected central tube and a threaded tube, wherein the threaded tube is sleeved on the central tube; the central tube is connected to the first production tube, the central tube and the first production tube have the same center line, and the threaded tube is threadedly connected with a rotating handle; The central tube is configured such that: when the rotating handle rotates relative to the threaded tube, the central tube moves along the axial direction of the threaded tube driven by the threaded tube; The heavy oil fire drive horizontal section experimental equipment is installed in an experimental box through the connecting structure of the heavy oil fire drive horizontal section experimental equipment, and a heating system, a pumping system, a data acquisition and analysis system, and a produced material collection and analysis system are connected outside the experimental box; Air is injected into the test box through the pumping system to ignite the oil sands, and the oil sands begin to burn to form a burned area, a burning area, an oil-rich area and a crude oil area. The dividing line between the burning area and the oil-rich area is the front end of the fire line, and the dividing line between the oil-rich area and the crude oil area is the flow front end; The connection structure includes a second connection joint, a second production pipe, a fixing part inside the box and a fixing part outside the box. One end of the second production pipe is threadedly connected to the first production pipe, and the other end is threadedly connected to the center pipe. The rotating handle in the heavy oil fire drive horizontal section experimental equipment is rotated, and the rotating handle drives the threaded pipe, the center pipe, the second production pipe, the first production pipe, the plugging part and the sealing part in the heavy oil fire drive horizontal section experimental equipment to move along the axial direction of the threaded pipe, ensuring that the front end of the fire line and the front end of the flow are respectively located on both sides of the sealing part.

2. The heavy oil fire flooding horizontal section experimental equipment according to claim 1 is characterized in that: The sealing member and the shell are both in the shape of circular tubes, the portion of the sealing member located outside the first production pipe is in the shape of a cylinder, the outer circumferential surface of the sealing member is completely fitted to the inner wall of the shell, and the portion of the sealing member located outside the first production pipe is completely fitted to the inner circumferential surface of the sealing member.

3. The heavy oil fire flooding horizontal section experimental equipment according to claim 2 is characterized in that: The outer circumferential surface of the sealing member is provided with a plurality of protrusions at intervals in the circumferential direction, and the inner circumferential surface of the shell is provided with a plurality of grooves at intervals in the circumferential direction, and each of the protrusions is correspondingly slidably installed in each of the grooves.

4. The heavy oil fire flooding horizontal section experimental equipment according to any one of claims 1 to 3, characterized in that: The housing comprises a closed joint, a two-way joint, a first tube body and a second tube body; The closed joint is an end of the shell away from the opening, the closed joint is threadedly connected to the first end of the two-way joint, and a gasket is installed between the closed joint and the two-way joint; The first end of the first tube body is threadedly connected to the second end of the two-way joint, the second end of the first tube body is threadedly connected to the second tube body, and the first sieve holes are arranged on the circumference of the second tube body.

5. The heavy oil fire flooding horizontal section experimental equipment according to claim 1, characterized in that: The central tube comprises a first central tube and a second central tube, wherein the first central tube and the second central tube are respectively threadedly connected to the inner circumferential surfaces at both ends of the first connecting joint; The threaded tube is sleeved on the second center tube, and the threaded tube is fixedly connected to the first connecting joint through a positioning joint. The first end of the positioning joint is threadedly connected to the outer circumferential surface of the first connecting joint, and the second end of the positioning joint is threadedly connected to the threaded tube.

6. The heavy oil fire flooding horizontal section experimental equipment according to claim 5, characterized in that: A connecting flange is provided at one end of the threaded pipe away from the main structure, a first through hole and a first threaded hole are provided on the connecting flange, and the threaded pipe is slidably installed in the first through hole; A screw with a length scale is installed in the first threaded hole, one end of the screw is threadedly connected to the first threaded hole, and the other end is threadedly connected to a connecting piece, and the connecting piece is clamped on the connecting structure.

7. The heavy oil fire flooding horizontal section experimental equipment according to claim 1 is characterized in that: The second connection joint is clamped in the mounting hole of the experimental box, and the external fixing piece and the internal fixing piece are respectively threadedly connected to two ends of the second connection joint; the internal fixing piece is fixedly installed on the inner wall of the experimental box, and the external fixing piece is fixedly installed on the outer wall of the experimental box; The second connection joint, the fixing piece inside the box body and the fixing piece outside the box body are all hollow components, and the second production pipe is inserted into the second connection joint, the fixing piece outside the box body and the fixing piece inside the box body.

8. The heavy oil fire flooding horizontal section experimental equipment according to claim 7, characterized in that: A first rubber member is disposed in the box body fixing member, and the first rubber member completely fills a gap between the second production pipe and the box body fixing member.

9. The heavy oil fire flooding horizontal section experimental equipment according to claim 7, characterized in that: Two second rubber pieces and washers are arranged inside the fixing piece outside the box body, and the two second rubber pieces and washers completely fill the gap between the second production pipe and the fixing piece outside the box body, and the two second rubber pieces are arranged on both sides of the washers respectively; The connection structure also includes an outer flange on the box body, which is provided with a second through hole, and the outer fixing piece on the box body is provided with a second threaded hole, the center lines of the second through hole and the second threaded hole are parallel to the axial direction of the threaded pipe, the outer flange on the box body and the outer fixing piece on the box body are fixed by bolts passing through the second through hole and the second threaded hole, and a flange gasket is also installed between the outer flange on the box body and the outer fixing piece on the box body.

10. A method for using a heavy oil fire flooding horizontal section experimental equipment, characterized in that: The heavy oil fire flooding horizontal section experimental device is applied to any one of claims 1 to 9, and the method for using the heavy oil fire flooding horizontal section experimental device comprises the following steps: The heavy oil fire drive horizontal section experimental equipment is installed in an experimental box through the connecting structure of the heavy oil fire drive horizontal section experimental equipment, and a heating system, a pumping system, a data acquisition and analysis system, and a produced material collection and analysis system are connected outside the experimental box; Filling the oil sand made by mixing heavy oil and quartz stone into the experimental box; Performing a sealing test on the test box and the heavy oil fire flooding horizontal section test equipment, and heating the oil sand to a design temperature through the heating system after the sealing test is passed; Air is injected into the test box through the pumping system to ignite the oil sands, and the oil sands begin to burn to form a burned area, a burning area, an oil-rich area and a crude oil area. The dividing line between the burning area and the oil-rich area is the front end of the fire line, and the dividing line between the oil-rich area and the crude oil area is the flow front end; The physical field data in the experimental box is read by the data acquisition and analysis system, the produced material is analyzed by the produced material collection and analysis system, and the position of the flow front end is determined by combining the physical field data and the analysis data of the produced material; Rotate the rotating handle in the heavy oil fire drive horizontal section experimental equipment, the rotating handle drives the threaded pipe, the center pipe, the second production pipe, the first production pipe, the plugging member and the packing member in the heavy oil fire drive horizontal section experimental equipment to move along the axial direction of the threaded pipe, and ensure that the front end of the fire line and the front end of the flow are respectively located on both sides of the packing member; Repeat the determination of the flow front position and the adjustment of the rotating handle until the experiment is finished.

Images