Well completion heat insulation pipe column for thickened oil sidetracking well

Abstract

The utility model belongs to the technical field of heavy oil thermal recovery, and particularly relates to a well completion thermal insulation pipe column for a heavy oil sidetracking well. According to the thickened oil sidetracking well completion thermal insulation pipe column, the operation requirements of cased well completion and shaft thermal insulation can be met at a time under the condition that the thickened oil well sidetracking well completion inner diameter is not reduced, and therefore the thickened oil sidetracking well completion operation time is effectively shortened, and the thickened oil sidetracking well completion operation workload and cost are reduced. A thickened oil sidetracking well completion heat insulation pipe column comprises a heat insulation pipe body and a heat insulation coupling. The heat insulation pipe body is composed of an outer pipe and an inner pipe. A heat insulation pipe annulus is arranged between the outer pipe and the inner pipe, and the heat insulation pipe annulus is vacuumized or filled with a heat insulation material; the heat insulation coupling is composed of a coupling shell and a coupling inner core. A heat insulation coupling annulus is arranged between the coupling shell and the coupling inner core, and the heat insulation coupling annulus is filled with heat insulation materials.

Description

Technical Field

[0001] The utility model belongs to the technical field of heavy oil thermal recovery, in particular to a heavy oil side drilling and completion insulation pipe string. Background Art

[0002] After years of steam injection and multiple rounds of production, casing damage in heavy oil wells is becoming more and more frequent, which may even cause the well to stop production or even be scrapped. To solve the above problems, technicians usually use the side drilling technology, using the wellbore and resources of the original well to open windows and holes on the side of the original wellbore at a certain depth, so as to form a new wellbore below the side drilling window opening at the target oil layer position after drilling, so as to restore the production of long-stopped wells and scrapped wells.

[0003] It is worth noting that in the existing technology, during the side drilling and completion process of heavy oil wells, technicians will choose to use small-sized coupling casing or uncoupling casing; the reason is that the new wellbore inner diameter after completion is usually small. The smaller wellbore inner diameter will further affect the specifications of the insulation pipes that can be used for steam injection operations. What's more, the side drilling section cannot be lowered into the insulation pipe, which affects the steam injection process of the side drilling of heavy oil wells. In addition, technicians also noticed that due to the thermal expansion and contraction effect of high-temperature and high-pressure steam, the hangers, packers, and insulated oil pipes used in the existing insulation process are prone to sealing failure and equipment wear, which will cause sand production and even the scrapping of the side drilling well. Therefore, it is urgent for technicians in this field to provide a heavy oil side drilling completion insulation pipe string to meet the needs of the existing heavy oil side drilling steam injection process. Utility Model Content

[0004] The utility model provides a heavy oil side drilling completion insulation pipe string. The heavy oil side drilling completion insulation pipe string can meet the operation requirements of casing completion and wellbore insulation at one time without reducing the inner diameter of the heavy oil well side drilling completion, thereby effectively reducing the heavy oil side drilling completion operation time, reducing the heavy oil side drilling completion operation workload and cost; and has a good steam injection use effect, a high utilization rate of hot steam, can effectively extend the service life of the thermal recovery side drilling, and provide help to improve the development efficiency of heavy oil wells.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0006] A heavy oil side drilling completion insulation pipe string, comprising: an insulation pipe body and an insulation coupling; wherein, through the insulation coupling, a plurality of insulation pipe bodies are connected end to end in series to form a heavy oil side drilling completion insulation pipe string integrating steam injection and production;

[0007] The heat-insulating pipe body is composed of an outer pipe and an inner pipe; a heat-insulating pipe annulus is provided between the outer pipe and the inner pipe, and the heat-insulating pipe annulus is evacuated or filled with heat-insulating materials;

[0008] The heat-insulating coupling consists of a coupling shell and a coupling inner core; a heat-insulating coupling annulus is arranged between the coupling shell and the coupling inner core, and the heat-insulating coupling annulus is filled with heat-insulating material.

[0009] Preferably, the outer ends of the inner tube extending out of both ends of the outer tube are processed with male threads, and the inner side of the inner core of the coupling is processed with female threads; the inner tube and the inner core of the coupling are connected to each other through the threaded cooperation between the male threads and the female threads.

[0010] Preferably, the end of the inner tube male thread and the end of the coupling inner core female thread are also provided with mutually matching conical sealing parts respectively; the conical sealing parts are used to achieve interference sealing fit between the inner tube and the coupling inner core.

[0011] More preferably, a first buffer portion is provided at the outer end surface of the outer tube; a second buffer portion is provided at the outer end surface of the coupling shell; the first buffer portion and the second buffer portion cooperate with each other to achieve the screwing and positioning cooperation between the insulation tube body and the insulation coupling.

[0012] Optionally, the outer diameter of the thermal insulation pipe body formed is not greater than 139.7 mm, the outer diameter of the thermal insulation pipe body formed is not less than 99.56 mm; the outer diameter of the thermal insulation coupling formed is not greater than 149.22 mm.

[0013] The utility model provides a heavy oil side drilling completion insulation pipe string, which comprises: an insulation pipe body and an insulation coupling; wherein the insulation pipe body is composed of an outer pipe and an inner pipe; an insulation pipe annulus is arranged between the outer pipe and the inner pipe, and the insulation pipe annulus is vacuumed or filled with insulation material; the insulation coupling is composed of a coupling shell and a coupling inner core; an insulation coupling annulus is arranged between the coupling shell and the coupling inner core, and the insulation coupling annulus is filled with insulation material. The heavy oil side drilling completion insulation pipe string with the above structural characteristics can meet the operational requirements of casing completion and wellbore insulation at one time without reducing the inner diameter of the heavy oil side drilling completion, thereby effectively reducing the heavy oil side drilling completion operation time, and reducing the workload and cost of the heavy oil side drilling completion operation; in addition, the heavy oil side drilling completion insulation pipe string has good insulation reliability, which can effectively ensure the safety of casing use and further improve the utilization rate of steam thermal energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation on the present invention. In the following drawings:

[0015] Figure 1A schematic diagram of the structure of a heat-insulated pipe string for heavy oil side drilling and completion provided by the utility model;

[0016] Figure 2 A schematic structural diagram of a heat-insulating pipe body in a heat-insulating pipe string for heavy oil side drilling and completion provided by the utility model;

[0017] Figure 3 A schematic diagram of the structure of a heat-insulating coupling in a heat-insulating pipe string for heavy oil side drilling and completion provided by the utility model;

[0018] Figure markings: 1. Insulated pipe body; 1-1. Outer pipe; 1-2. Insulated pipe annulus; 1-3. Inner pipe; 1-4. Male thread; 1-5. Conical sealing portion at the end of the male thread; 2. Insulated coupling; 2-1. Coupling shell; 2-2. Insulated coupling annulus; 2-3. Coupling inner core; 2-4. Female thread; 2-5. Conical sealing portion at the end of the female seal. DETAILED DESCRIPTION

[0019] The utility model provides a heavy oil side drilling completion insulation pipe string. The heavy oil side drilling completion insulation pipe string can meet the operation requirements of casing completion and wellbore insulation at one time without reducing the inner diameter of the heavy oil well side drilling completion, thereby effectively reducing the heavy oil side drilling completion operation time, reducing the heavy oil side drilling completion operation workload and cost; and has a good steam injection use effect, a high utilization rate of hot steam, can effectively extend the service life of the thermal recovery side drilling, and provide help to improve the development efficiency of heavy oil wells.

[0020] The utility model provides a heavy oil side drilling completion insulation pipe string, such as Figure 1 As shown, it includes: a heat-insulated pipe body and a heat-insulated coupling. Through the heat-insulated coupling, multiple heat-insulated pipe bodies are connected end to end in series to form a heavy oil side drilling completion heat-insulated pipe string with integrated steam injection and production.

[0021] For further reference, see Figure 2 As shown, the insulation pipe body is composed of an outer pipe and an inner pipe; an insulation pipe annulus is provided between the outer pipe and the inner pipe, and the insulation pipe annulus is evacuated or filled with insulation material. Figure 3 As shown, the heat-insulating coupling is composed of a coupling shell and a coupling inner core; a heat-insulating coupling annulus is arranged between the coupling shell and the coupling inner core, and the heat-insulating coupling annulus is filled with heat-insulating material.

[0022] It is worth noting that, as a preferred embodiment of the present invention, the outer ends of the inner tube extending from both ends of the outer tube are processed with male threads, and the inner side of the inner core of the coupling is processed with female threads. The inner tube and the inner core of the coupling are connected to each other through the threaded cooperation between the male threads and the female threads.

[0023] In addition, it is further preferred that the end of the inner tube male thread and the end of the coupling inner core female thread are respectively provided with mutually matching conical sealing parts, which are used to achieve interference sealing between the inner tube and the coupling inner core.

[0024] Furthermore, a first buffer portion is provided at the outer end surface of the outer tube, and a second buffer portion is provided at the outer end surface of the coupling shell. The first buffer portion and the second buffer portion cooperate with each other to achieve the screwing and positioning cooperation between the heat insulation pipe body and the heat insulation coupling.

[0025] Finally, it is necessary to add that in order to further implement the drilling and completion and steam injection insulation effects of the heavy oil side drilling and completion insulation pipe string provided by the utility model, the following restrictions are made on the size of the insulation pipe body and the insulation coupling: Specifically and preferably, the outer diameter of the insulation pipe body formed is not greater than 139.7mm, and the outer diameter of the insulation pipe body formed is not less than 99.56mm; the outer diameter of the insulation coupling formed is not greater than 149.22mm. The heavy oil side drilling and completion insulation pipe string with the above-mentioned size characteristics is particularly suitable as a completion pipe string after drilling inside the existing 177.8mm casing. Specifically, steam is directly injected from the insulation pipe string during steam injection to achieve injection and production integration. In addition, the heavy oil side drilling and completion insulation pipe string with the above-mentioned size characteristics can also be matched with the existing commonly used 114.3mm casing inner diameter, so as to achieve sand prevention by hanging sand filter pipe or extrusion filling sand prevention, and finally play a technical effect of preventing formation sand (formation sand will affect the normal production operation of thermal recovery wells).

[0026] The utility model provides a heavy oil side drilling completion insulation pipe string, which comprises: an insulation pipe body and an insulation coupling; wherein the insulation pipe body is composed of an outer pipe and an inner pipe; an insulation pipe annulus is arranged between the outer pipe and the inner pipe, and the insulation pipe annulus is vacuumed or filled with insulation material; the insulation coupling is composed of a coupling shell and a coupling inner core; an insulation coupling annulus is arranged between the coupling shell and the coupling inner core, and the insulation coupling annulus is filled with insulation material. The heavy oil side drilling completion insulation pipe string with the above structural characteristics can meet the operational requirements of casing completion and wellbore insulation at one time without reducing the inner diameter of the heavy oil side drilling completion, thereby effectively reducing the heavy oil side drilling completion operation time, and reducing the workload and cost of the heavy oil side drilling completion operation; in addition, the heavy oil side drilling completion insulation pipe string has good insulation reliability, which can effectively ensure the safety of casing use and further improve the utilization rate of steam thermal energy.

[0027] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A heavy oil side drilling completion insulation string, characterized in that: It includes: a heat-insulated pipe body and a heat-insulated coupling; wherein, through the heat-insulated coupling, multiple heat-insulated pipe bodies are connected end to end in series to form a heavy oil side drilling and completion heat-insulated pipe string for integrated steam injection and production; The heat-insulating pipe body is composed of an outer pipe and an inner pipe; a heat-insulating pipe annulus is provided between the outer pipe and the inner pipe, and the heat-insulating pipe annulus is evacuated or filled with heat-insulating materials; The heat-insulating coupling consists of a coupling shell and a coupling inner core; a heat-insulating coupling annulus is arranged between the coupling shell and the coupling inner core, and the heat-insulating coupling annulus is filled with heat-insulating material.

2. A heavy oil sidetracking completion insulation string according to claim 1, characterized in that: The outer ends of the inner tube extending out of both ends of the outer tube are processed with male threads, and the inner side of the inner core of the coupling is processed with female threads; the inner tube and the inner core of the coupling are connected to each other through the thread cooperation between the male threads and the female threads.

3. A heavy oil sidetracking completion insulation string according to claim 2, characterized in that: The end of the inner tube male thread and the end of the coupling inner core female thread are also respectively provided with mutually matching conical sealing parts; the conical sealing parts are used to achieve interference sealing fit between the inner tube and the coupling inner core.

4. A heavy oil sidetracking completion insulation string according to claim 2, characterized in that: A first buffer portion is also provided at the outer end surface of the outer tube; a second buffer portion is also provided at the outer end surface of the coupling shell; the first buffer portion and the second buffer portion cooperate with each other to achieve the screwing and positioning cooperation between the insulation pipe body and the insulation coupling.

5. The heavy oil sidetracking completion insulation string according to claim 1, characterized in that: The outer diameter of the thermal insulation pipe body formed is not greater than 139.7mm, and the outer diameter of the thermal insulation pipe body formed is not less than 99.56mm; the outer diameter of the thermal insulation coupling formed is not greater than 149.22mm.

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