Uniform injection and production device for horizontal well

Abstract

The utility model belongs to the technical field of oil exploitation, and discloses a uniform injection and production device for a horizontal well. The device comprises a pipe body, a through hole and a valve hole, the pipe body comprises a middle protruding pipe section and end connecting sections at the two ends. The through hole is formed in the pipe wall of the middle convex pipe section of the pipe body, and the opening direction of the through hole is perpendicular to the central axis of the pipe body; the valve holes are formed in the two sides of the through hole and located outside the side wall of the pipe body, and the opening direction of the valve holes is perpendicular to the central axis of the through hole. The interiors of the pipe body, the through hole and the valve hole are sequentially communicated. The uniform injection and production device for the horizontal well has multiple functions, can be installed on the steam injection main pipe of the horizontal section to inject gas, can also be installed on a production well to adjust the liquid production section of the horizontal section through the liquid production valve, achieves the purpose of improving the production degree, meanwhile can optimize multiple steam injection directions, and improves the production efficiency. And moreover, the structure is simple, the production and processing cost is low, and the operation is flexible, convenient and fast.

Description

Technical Field

[0001] The utility model belongs to the technical field of petroleum exploitation, in particular to a heavy oil horizontal well steam injection and production tool, specifically to a horizontal well uniform injection and production device. Background Art

[0002] In the heavy oil production process, the existing heavy oil injection and production devices mostly include steam injection valve devices with steam injection function, which are used to realize stratified steam injection or segmented steam injection. For example:

[0003] The Chinese patent with publication number CN205382911U provides a high-temperature steam injection valve, which includes a main body, which is provided with a channel that penetrates it along its extension direction. The wall of the main body is provided with a sleeve that connects the channel with the outside of the main body. The sleeve is located in the channel, which blocks the steam injection hole. The upper end of the sleeve can be blocked by a valve ball, so that it slides along the extension direction of the main body under the pressure outside the well to open the steam injection hole. The high-temperature sealing mechanism is provided between the outer wall of the sleeve and the channel, which can seal the sleeve and the main body. The high-temperature steam injection valve provided by the patent can prevent steam from being injected into the oil layer below the high-temperature steam injection valve, and realize the steam injection work of the target oil layer.

[0004] The Chinese patent with publication number CN109025934A provides a reversible steam injection valve, which at least includes a valve body and a switch assembly, wherein the valve body has an axially penetrating steam injection channel, the outer sealing sleeve of the valve body is provided with a jacket, an annulus is formed between the jacket and the valve body, a steam inlet, a steam injection pipe, a stopper and a steam exhaust port are provided on the side wall of the valve body, and the switch assembly includes a first switch and a second switch, wherein the first switch has a first working position for blocking the steam injection pipe and a second working position for abutting the stopper and blocking the steam injection channel; the second switch is provided with a first steam injection port and a second steam injection port, wherein the second switch has a first steam injection position for blocking the steam inlet and a second steam injection position for abutting the first switch, and when the second switch is located at the second steam injection position, the first steam injection port is connected to the steam inlet, and the second steam injection port is connected to the steam injection pipe. The patent can achieve the designed steam injection amount without affecting the production time rate and crude oil production of the oil well.

[0005] The Chinese patent with publication number CN206016768U provides a double-flow channel steam injection valve, which includes an inner sleeve, an outer sleeve and a sealing sleeve, wherein the outer sleeve is arranged outside the inner sleeve, the upper end of the inner sleeve is provided with an upper clamping ring which is sealed with the inner wall surface of the outer sleeve, the inner sleeve is provided with a first flow channel along the axial direction, an upper steam injection port is provided at the lower part of the first flow channel, a steam inlet which is sealed and connected with the upper steam injection port is provided on the outer sleeve, an annulus is provided between the outer wall surface of the inner sleeve and the inner wall surface of the outer sleeve to form a second flow channel, the outer sleeve is provided with a blocking gauze, a second flow channel steam injection port is provided at the upper part of the first flow channel, the sealing sleeve can be axially moved in the first flow channel, and a sealing portion for ball-casting is provided at the bottom of the sealing sleeve. The double-flow channel steam injection valve provided by the patent solves the problem that the steam injection valve is often difficult to open due to sanding in the layer, makes the double-flow channel steam injection valve easy and convenient to open, and realizes the upper and lower layer stratified steam injection, which is conducive to improving the utilization degree of the reservoir.

[0006] However, in the prior art, the steam injection valve of the heavy oil injection and production device has only a single steam injection function and no production function. It can only indirectly affect the production effect while maintaining the steam injection pressure and the steam injection volume. Moreover, the steam injection direction is perpendicular to the center line of the downhole string. Under high steam injection pressure, the screen pipe may be impacted, and new measures need to be proposed. Therefore, new oil production technology needs to be adopted to solve the above problems and improve the development effect. Utility Model Content

[0007] The utility model aims to solve at least one technical problem existing in the background technology and provides a horizontal well uniform injection and production device, which is multifunctional and can be installed on the steam injection main pipe of the horizontal section for gas injection, and can also be installed on the production well to adjust the liquid production profile of the horizontal section through the liquid production valve to achieve the purpose of improving the utilization degree. At the same time, it can optimize the multiple steam injection directions to avoid the impact damage of the high steam injection pressure on the screen pipe, and has a simple structure, low production and processing costs, and flexible and convenient operation.

[0008] In order to achieve the above technical objectives, the utility model adopts the following technical solutions:

[0009] A horizontal well uniform injection and production device, comprising a pipe body, a through hole and a valve hole;

[0010] The tube body comprises a middle convex tube section and end connection sections at both ends;

[0011] The through hole is opened on the tube wall of the middle convex tube section of the tube body, and the opening direction of the through hole is perpendicular to the central axis of the tube body;

[0012] The valve holes are opened on both sides of the through hole and are located outside the side wall of the tube body, and the opening direction of the valve holes is perpendicular to the central axis of the through hole;

[0013] The interiors of the tube body, the through hole and the valve hole are connected in sequence.

[0014] Furthermore, the through hole is a circular hole, and an inner wall of an outer end of the through hole is provided with an internal thread.

[0015] Furthermore, the outer port is conical.

[0016] Furthermore, a plurality of through holes are evenly spaced and arranged along the circumference of the tube wall of the middle convex tube, and two valve holes are formed through both sides of each through hole.

[0017] Furthermore, eight through holes are evenly spaced along the circumference of the tube wall of the middle convex tube.

[0018] Furthermore, the valve hole is a circular hole, and an inner wall of an outer port of the valve hole is provided with an internal thread.

[0019] Furthermore, the middle convex pipe section of the pipe body is provided with a groove, and the valve hole is communicated with the groove.

[0020] Furthermore, when the valve hole is threadedly connected to the steam injection valve or the liquid production valve, the steam injection valve or the liquid production valve is located in the groove and the outer wall does not exceed the outer diameter of the intermediate pipe section.

[0021] Furthermore, the tube body, the through hole and the valve hole are manufactured in one piece.

[0022] Furthermore, the end connection sections at both ends of the tube body are provided with stepped shafts, and external threads are provided on the convex shafts of the stepped shafts to form threaded connection sections.

[0023] Compared with the prior art, the beneficial effects produced by the utility model are:

[0024] The horizontal well uniform injection and production device provided by the utility model has the following functions:

[0025] (1) Installed on the steam injection main of the horizontal section, lowered into the designated position, the steam injection valve is used to adjust the horizontal section suction profile to improve development efficiency;

[0026] (2) Installed on the production liner of the production well, the production valve can be used to adjust the production profile of the horizontal section to achieve the purpose of increasing the production degree and promoting a significant increase in the temperature of the unproduced horizontal section;

[0027] (3) At the same time, it can optimize the design of multiple steam injection directions to avoid impact damage to the screen tube caused by high steam injection pressure;

[0028] (4) Simple structure, low production and processing cost, and flexible and convenient operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a structural schematic diagram of a horizontal well uniform injection and production device of the utility model;

[0030] Figure 2 This is a dryness distribution diagram of the steam injection horizontal section without using the horizontal well uniform injection and production device of the utility model;

[0031] Figure 3 This is a dryness distribution diagram of the steam injection horizontal section of the horizontal well uniform injection and production device using the utility model;

[0032] Markings in the figure: 1-tube body; 2-through hole, 2.1-external port; 3-valve hole; 4-groove; 5-threaded connection section. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0034] In the description of the present invention, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inside", "front", "center", "both ends" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0035] In the present utility model, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixation" and "screw-on" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the utility model according to the specific circumstances.

[0036] like Figure 1As shown, an embodiment of the utility model provides a horizontal well uniform injection and production device, which adopts an integrally formed structure, including a pipe body 1, a through hole 2 and a valve hole 3; the pipe body 1 includes a middle convex pipe section and end connecting sections at both ends, the through hole 2 is opened on the pipe wall of the middle convex pipe section of the pipe body 1, and is a circular hole, and the opening direction of the through hole 2 is perpendicular to the central axis of the pipe body 1; the valve hole 3 is opened on both sides of the through hole 2 and is located outside the side wall of the pipe body 1, the valve hole 3 is a circular hole, and the opening direction of the valve hole 3 is perpendicular to the central axis of the through hole 2; the interiors of the pipe body 1, the through hole 2 and the valve hole 3 are sequentially connected.

[0037] There are 8 through holes 2 evenly spaced along the circumference of the wall of the middle convex pipe, and two valve holes 3 are provided on both sides of each through hole 2; the purpose of this arrangement is to provide a channel for steam injection and liquid production within a radial range of 360° after the device is lowered into a horizontal well.

[0038] Furthermore, an inner wall of the outer port of the valve hole 3 is provided with an internal thread, which is used for threaded connection to a steam injection valve or a liquid production valve under some working conditions; the middle convex pipe section of the pipe body 1 is provided with a groove 4, and the valve hole 3 is communicated with the groove 4. When the valve hole 3 is threadedly connected to the steam injection valve or the liquid production valve, the steam injection valve or the liquid production valve is located in the groove 4 and the outer wall does not exceed the outer diameter of the middle pipe section. In this way, the maximum outer diameter of the entire device will not be increased, the overall structure is more compact, and the construction and downhole operation are more convenient.

[0039] Furthermore, the inner wall of the outer port 2.1 of the through hole 2 is provided with an internal thread, which is used to tighten and seal the outer port 2.1 by a through hole screw under some working conditions; further, the outer port 2.1 is conical, and the purpose of this setting is: when sealing and connecting, the sealing performance of the conical port is better than that of the cylindrical port.

[0040] The end connection sections at both ends of the pipe body 1 are provided with stepped shafts, and the convex shafts of the stepped shafts are provided with external threads to form threaded connection sections 5 for threaded connection with the upper and lower joints of the steam injection main pipe or the production liner.

[0041] Example 1

[0042] For steam injection horizontal wells, connect the following Figure 1 The horizontal well uniform injection and production device shown is lowered into the well, the outer port 2.1 of the through hole 2 is sealed by a through hole screw, and the valve hole 3 is connected to the steam injection valve. When steam is injected into the heavy oil horizontal well, the steam flows from the inside of the pipe body 1 to the through hole 2 on the side wall of the pipe body 1. Since the port of the through hole 2 has been sealed by the through hole screw and cannot escape, the steam flows out horizontally through the valve hole 3, and the direction of the steam when flowing out is parallel to the pipe body 1, which can avoid impact damage to the screen pipe under high steam injection pressure.

[0043] Example 2

[0044] For steam injection horizontal wells, connect the following Figure 1 The horizontal well uniform injection and production device shown is lowered into the well, the outer port 2.1 of the through hole 2 is opened, and the valve hole 3 is connected to the steam injection valve. When steam is injected into the heavy oil horizontal well, the steam flows from the inside of the pipe body 1 to the through hole 2 on the side wall of the pipe body 1, and then flows out from the outer port 2.1 of the through hole 2, and can also flow out horizontally from the valve hole 3.

[0045] Example 3

[0046] For production horizontal wells, the production liner is connected with Figure 1 The horizontal well uniform injection and production device shown is lowered into the well, the outer port 2.1 of the through hole 2 is tightened and sealed by a through hole screw, and the valve hole 3 is connected to the liquid production valve. When the horizontal well is produced, the fluid in the reservoir flows into the valve hole 3 through the liquid production valve, and then flows into the pipe body 1 through the through hole 2 on the side wall of the pipe body 1, and then flows to the ground through the pipe body 1.

[0047] Example 4

[0048] For production horizontal wells, the production liner is connected with Figure 1 The horizontal well uniform injection and production device shown is lowered into the well, and the outer port 2.1 of the through hole 2 opens the valve hole 3 to connect the liquid production valve. When the horizontal well is produced, the fluid in the reservoir flows into the valve hole 3 through the liquid production valve, and then flows into the pipe body 1 through the through hole 2 on the side wall of the pipe body 1. It can also flow directly into the pipe body 1 from the through hole 2, and then flow to the ground through the pipe body 1.

[0049] Example 5

[0050] According to the geological profile of the horizontal section, the connectivity between wells, the temperature profile of the production wells and other data, appropriate performance parameters of the uniform injection and production device are designed, including: the number of uniform injection and production devices to be installed and the lowering position, the number of liquid production valves installed on each uniform injection and production device and the number of through holes 2 opened, etc. After using the horizontal section uniform injection and production device, the utilization degree and dryness of the horizontal section can be significantly improved.

[0051] like Figure 2-3 As shown, the horizontal section of a well is 388m long. When the horizontal well uniform injection and production device of the utility model is not used, the casing dryness at node 51 (600m) is 74%;

[0052] After using the horizontal well uniform injection and production device of the utility model, the casing dryness at the node 51 (600m) increased to 86%, with an improvement of 11%.

[0053] In addition, the utilization degree of the horizontal section of the well is reflected by the downhole temperature monitoring data, that is, the proportion of temperature measuring points below 100°C to the total number of temperature measuring points is the utilization degree.

[0054] There are 10 temperature measuring points evenly distributed in the horizontal section of the well. When the horizontal well uniform injection and production device of the utility model is not used, the temperature of the temperature measuring point corresponding to the node 51 (600m) is lower than 100°C, indicating that the temperature measuring point is not used; at the same time, the temperatures of 2 of the 10 temperature measuring points are lower than 100°C, and the utilization degree is calculated to be 80%;

[0055] After using the horizontal well uniform injection and production device of the utility model, the temperature of the temperature measuring point corresponding to the node 51 (600m) is higher than 100°C, and the temperature measuring point is mobilized; at the same time, the temperatures of the 10 temperature measuring points are checked in turn and all are higher than 100°C. The utilization degree is calculated to be 100%, and the utilization degree is increased by 20%.

[0056] The above description is only an embodiment of the present invention and is not intended to limit the present invention. Any modification, equivalent replacement and improvement made within the scope of application of the present invention shall be included in the protection scope of the present invention.

Claims

1. A horizontal well uniform injection and production device, characterized in that: It includes a tube body, a through hole and a valve hole; The tube body comprises a middle convex tube section and end connection sections at both ends; The through hole is opened on the tube wall of the middle convex tube section of the tube body, and the opening direction of the through hole is perpendicular to the central axis of the tube body; The valve holes are opened on both sides of the through hole and are located outside the side wall of the tube body, and the opening direction of the valve holes is perpendicular to the central axis of the through hole; The interiors of the tube body, the through hole and the valve hole are connected in sequence.

2. The device according to claim 1, characterized in that The through hole is a circular hole, and an inner wall of an outer end of the through hole is provided with an internal thread.

3. The device according to claim 2, characterized in that The outer port is conical.

4. The device according to any one of claims 1 to 3, characterized in that: A plurality of through holes are evenly spaced and arranged along the circumference of the tube wall of the middle convex tube, and two valve holes are provided on both sides of each through hole.

5. The device according to claim 4, characterized in that There are 8 through holes evenly spaced along the circumference of the tube wall of the middle convex tube.

6. The device according to claim 1, characterized in that The valve hole is a circular hole, and an inner wall of an outer port of the valve hole is provided with an internal thread.

7. The device according to claim 6, characterized in that The middle convex pipe section of the pipe body is provided with a groove, and the valve hole is communicated with the groove.

8. The device according to claim 7, characterized in that When the valve hole is threadedly connected to the steam injection valve or the liquid production valve, the steam injection valve or the liquid production valve is located in the groove and the outer wall does not exceed the outer diameter of the middle convex pipe section.

9. The device according to any one of claims 1-3, 5-8, characterized in that: The tube body, the through hole and the valve hole are manufactured in one piece.

10. The device according to claim 9, characterized in that The end connection sections at both ends of the tube body are provided with stepped shafts, and external threads are provided on the convex shafts of the stepped shafts to form threaded connection sections.

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