Straight inclined shaft layered filling sand prevention layered steam injection tubular column

Abstract

The utility model discloses a straight inclined shaft layered filling sand prevention layered steam injection tubular column which comprises a sand prevention tubular column body and a steam injection tubular column body, and the sand prevention tubular column body comprises an upper layer sand prevention screen pipe, an interlayer packer and a lower layer sand prevention screen pipe from top to bottom. The steam injection tubular column comprises an upper-layer steam injection switch and a steam injection insertion sealing rod from top to bottom; a sealing cylinder is arranged on the inner wall of the interlayer packer and used for being in butt joint with a steam injection insertion sealing rod for sealing. According to the utility model, after layered sand prevention, each production layer is packed by the packer; after a steam injection tubular column is tripped, effective physical packing inside and outside the screen pipe is realized through cooperation of an insertion seal and a sealing cylinder of a well-staying tubular column, and the steam injection efficiency is improved; during steam injection, the steam injection layer position is converted in a ball injection mode, independent steam injection of each layer under the condition that the layers do not interfere with one another is achieved, and the steam injection effect is improved.

Description

Technical Field

[0001] This utility model relates to the field of oil extraction technology, specifically a layered filling sand control and layered steam injection tubing for vertical and inclined wells. Background Technology

[0002] Conventional, general backfilling for sand control cannot meet the requirements for stratified steam injection in the later stages because there are no prefabricated interlayer packers and sealing cylinders outside the sand control tubing. This prevents the implementation of selective stratified steam injection and separate extraction processes in the later stages.

[0003] In the prior art, publication number CN111472737B discloses a layered steam injection tubing string and method for layered filling sand control wells, including an outer tubing string and an inner tubing string. The outer tubing string includes a well-staying tubing string, a top packer, a layered filling sand control tubing string, and an interlayer packer. The inner tubing string includes a compensator and a layered steam injection tubing string. The number of groups of the layered steam injection tubing string is consistent with the number of groups of the layered filling sand control tubing string. The layered steam injection tubing strings are connected in series in pairs. The uppermost layered steam injection tubing string is connected to the compensator. The layered steam injection tubing string includes a steam injection sealing assembly, a positioning pipe, and a steam injection device.

[0004] Announcement No. CN110107270B discloses a general method for single-point layered steam injection in sand control wells. The selected general method for single-point layered steam injection tubing in sand control wells includes an insulated oil pipe and a steam injection pipe connected sequentially from top to bottom. A thermal expansion compensator is installed on the insulated oil pipe, and an interlayer thermally sensitive packer is installed on the steam injection pipe. The interlayer thermally sensitive packer is seated on the inner wall of the sand control pipe and its height is located between two oil layers. During steam injection, steam enters the steam injection pipe from the insulated oil pipe and then exits from the lower end of the steam injection pipe. A portion of the steam directly enters the annulus between the casing and the sand control pipe from the sand control pipe corresponding to the lower oil layer with poor steam absorption capacity.

[0005] Announcement No. CN110094191B discloses a forced segmented injection-production tubing string and method for thermal recovery wells. The injection-production tubing string includes, from top to bottom, an integrated steam injection and oil production pump, a self-regulating uniform steam injection device, a self-regulating well fluid inlet device, and a steam injection tubing plug connected to the tubing. The self-regulating uniform steam injection device and the self-regulating well fluid inlet device are grouped together, with at least two groups. Each group of self-regulating uniform steam injection device and self-regulating well fluid inlet device corresponds to the same injection-production segment. A steam injection expansion packer is also connected to the tubing. The steam injection expansion packer seals the inner wall of the thermochemical sealing plug inside the casing. The number of steam injection expansion packers and thermochemical sealing plugs is the same, and there are at least three of each. Each thermochemical sealing plug forces the injection-production segmentation.

[0006] The aforementioned prior art is structurally different from that of this patent. This patent is superior to the aforementioned prior art in terms of steam injection construction efficiency in two oil layers.

[0007] In summary, the technical solutions, technical problems to be solved, and beneficial effects of the above-disclosed technologies are all different from those of this utility model. For more technical features, technical problems to be solved, and beneficial effects of this utility model, the above-disclosed technical documents do not provide any technical inspiration. Utility Model Content

[0008] In view of the above-mentioned defects in the existing technology, the purpose of this utility model is to provide a layered filling sand control and layered steam injection tubing for straight and inclined wells.

[0009] To achieve the above objectives, the present invention adopts the following technical solution:

[0010] A layered filling sand control and steam injection tubing string for vertical and inclined wells includes a sand control tubing string and a steam injection tubing string. The sand control tubing string includes, from top to bottom, an upper sand control screen pipe, an interlayer packer, and a lower sand control screen pipe. The steam injection tubing string includes, from top to bottom, an upper steam injection switch and a steam injection insertion sealing rod. A sealing cylinder is provided on the inner wall of the interlayer packer, and the sealing cylinder is used to connect and seal with the steam injection insertion sealing rod.

[0011] Furthermore, the steam injection string includes a steam injection heat insulation pipe, an upper steam injection switch, a steam injection insertion sealing rod, and an opening guide shoe connected from top to bottom.

[0012] Furthermore, the upper steam injection switch includes a steam injection sliding sleeve shell, which is tubular, and the tube wall of the steam injection sliding sleeve shell is provided with a steam injection port;

[0013] Specifically, the inner wall of the steam injection sleeve housing is connected to the steam injection sleeve by shear pins, the steam injection sleeve is sealed to the inner wall of the steam injection sleeve housing, and the steam injection sleeve covers and seals the steam injection port;

[0014] Specifically, a steam injection upper connector is provided at the upper end of the steam injection sleeve shell, and the inner diameter of the steam injection upper connector is larger than the inner diameter of the steam injection sleeve;

[0015] Specifically, the lower end of the steam injection sleeve housing is connected to the lower steam injection connector via a limiting step, and the inner diameter of the lower steam injection connector is smaller than the outer diameter of the steam injection sleeve.

[0016] Furthermore, the steam injection insulation pipe is connected to the upper steam injection switch via a second extension oil pipe, and the upper steam injection switch is connected to the steam injection insertion sealing rod via a first extension oil pipe.

[0017] Furthermore, the steam injection insertion sealing rod includes an outer convex ring, and the outer side wall of the outer convex ring is provided with an array of rubber rings.

[0018] Furthermore, the sand control pipe column includes a top packer, an upper filling sleeve, an upper sand control screen pipe, an interlayer packer, a lower filling sleeve, and a lower sand control screen pipe connected from top to bottom. The lower end of the lower sand control screen pipe is connected to a solid guide shoe through a sand sinking tail pipe.

[0019] Furthermore, the top packer is a suspended drop packer.

[0020] Compared with the prior art, the present invention has the following advantages:

[0021] The existing general steam injection mode is changed. After layered sand control, each production layer is isolated by packers. After the steam injection string is run, the insertion seal cooperates with the well string sealing cylinder to achieve effective physical isolation inside and outside the screen pipe, thereby improving the steam injection efficiency. During steam injection, the steam injection layer is changed by throwing balls to achieve independent steam injection of each layer without interference between layers, thereby improving the steam injection effect. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the sand-proof pipe column in this utility model.

[0023] Figure 2 This is a schematic diagram of the steam injection pipe column in this utility model.

[0024] Figure 3 This is a schematic diagram of the upper steam injection switch in this utility model.

[0025] Figure 4 This is a schematic diagram of the lower layer of a layered filling and sand-prevention steam injection pipe string for a straight and inclined well according to this utility model.

[0026] Figure 5 This is a schematic diagram of the upper layer of a layered filling and sand-prevention layered steam injection pipe string for a straight and inclined well according to this utility model.

[0027] In the diagram: 1-1: Top packer, 1-2: Upper filling sleeve, 1-3: Upper sand control screen, 1-4: Interlayer packer, 1-5: Lower filling sleeve, 1-6: Lower sand control screen.

[0028] 2-1: Opening guide shoe; 2-2: Steam injection insertion sealing rod; 2-3: Extended oil pipe one; 2-4: Upper steam injection switch; 2-5: Extended oil pipe two; 2-6: Steam injection heat insulation pipe.

[0029] 2-4-1: Steam injection sliding sleeve housing; 2-4-2: Steam injection sliding sleeve; 2-4-3: Limiting step; 2-4-4: Shear pin; 2-4-5: Steam injection port. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] Example 1:

[0032] Please see Figures 1 to 3 This utility model provides a layered filling, sand control, and steam injection tubing string for vertical and inclined wells, comprising a sand control tubing string and a steam injection tubing string. The sand control tubing string includes an upper sand control screen 1-3 and a lower sand control screen 1-6. The steam injection tubing string includes an upper steam injection switch 2-4 and a steam injection insertion sealing rod 2-2. The upper steam injection switch 2-4 is located above the steam injection insertion sealing rod 2-2, which seals against the inner wall of the sand control tubing string. The steam injection insertion sealing rod 2-2 is located between the upper sand control screen 1-3 and the lower sand control screen 1-6. Oil layer separation and sand control construction are performed using the sand control tubing string. After the sand control tubing string is inserted to the preset position according to the design, each layer of sand control screens faces and completely covers the oil layer. Layered steam injection is performed using the steam injection tubing string; specifically, the steam injection layer position is changed by the upper steam injection switch 2-4.

[0033] Furthermore, the sand control pipe column includes, from top to bottom, a top packer 1-1, an upper filling sleeve 1-2, an upper sand control screen 1-3, an interlayer packer 1-4, a lower filling sleeve 1-5, and a lower sand control screen 1-6 connected by threads. The lower end of the lower sand control screen 1-6 is connected to a solid guide shoe through a sand sinking tail pipe.

[0034] Specifically, the top packer 1-1 is a suspended drop packer, which can suspend the entire weight of the sand control pipe column after being set; the interlayer packer 1-4 can completely and independently isolate the upper and lower production layers after being set.

[0035] Specifically, the inner wall of the interlayer packer 1-4 is provided with a sealing cylinder, which is used to connect and seal with the steam injection insertion sealing rod 2-2 to achieve effective physical separation between the upper sand screen pipe 1-3 and the lower sand screen pipe 1-6. It should be noted that the inner wall of the central tube of the interlayer packer 1-4 can be smooth as a sealing cylinder, such as the compression packer disclosed in CN113445958B.

[0036] Specifically, the inner diameters of the upper filling sleeve 1-2 and the lower filling sleeve 1-5 are larger than the inner diameter of the sealing cylinder, which can effectively prevent the sleeves from opening accidentally when the steam injection pipe is lowered.

[0037] Furthermore, the steam injection string includes a steam injection heat insulation pipe 2-6 connected from top to bottom by threads, an upper steam injection switch 2-4, a steam injection insertion sealing rod 2-2, and an opening guide shoe 2-1.

[0038] Specifically, the steam injection heat insulation pipe 2-6 is connected to the upper steam injection switch 2-4 through an extension oil pipe 2-5, and the upper steam injection switch 2-4 is connected to the steam injection insertion sealing rod 2-2 through an extension oil pipe 2-3.

[0039] Specifically, the upper steam injection switch 2-4 includes a steam injection sliding sleeve shell 2-4-1, which is tubular. A steam injection port 2-4-5 is provided on the wall of the steam injection sliding sleeve shell 2-4-1. A steam injection sliding sleeve 2-4-2 is connected to the inner wall of the steam injection sliding sleeve shell 2-4-1 via a shear pin 2-4-4. The steam injection sliding sleeve 2-4-2 and the inner wall of the steam injection sliding sleeve shell 2-4-1 are sealed by a sealing ring. The steam injection sliding sleeve 2-4-2 covers and seals the steam injection port 2-4-5. A steam injection upper connector is provided at the upper end of the steam injection sliding sleeve shell 2-4-1, with an inner diameter larger than the inner diameter of the steam injection sliding sleeve 2-4-2. A steam injection lower connector is connected to the lower end of the steam injection sliding sleeve shell 2-4-1 via a limiting step 2-4-3, with an inner diameter smaller than the outer diameter of the steam injection sliding sleeve 2-4-2. When the steam injection port 2-4-5 of the upper steam injection switch 2-4 is closed, the steam injection is first carried out on the lower oil layer. Then, the steel ball is inserted, and the pressure is released to open the steam injection sleeve 2-4-2 to seal the lower oil layer. Then, the steam injection is carried out on the upper oil layer. After the steam injection of the two layers is completed, the steam injection string is pulled out and the pump is put into production.

[0040] Specifically, the steam injection insertion sealing rod 2-2 includes an outer convex ring, and the outer side wall of the outer convex ring is arrayed with high-temperature resistant vulcanized rubber rings. After the steam injection string is lowered into place, the steam injection insertion sealing rod 2-2 cooperates with the sealing cylinder of the well-stayed interlayer packer 1-4 to seal.

[0041] Example 2:

[0042] Based on Example 1, this example provides a method for using a layered filling sand control and layered steam injection tubing string for straight and inclined wells. In this example, the top packer 1-1 is the suspended drop sand control completion packer disclosed in CN102797429A.

[0043] Connect the sand control tubing to the setting service tubing, and lower the combination of the setting service tubing and sand control tubing. Once in place, set and verify the top packer. Release the setting service tubing, lift it to activate the setting channels of interlayer packers 1-4, pressurize and set interlayer packers 1-4, and remove the setting service tools. The combined use of the top packer and interlayer packers 1-4 effectively isolates the oil layer.

[0044] A drag-and-drop filling service tool is lowered, and gravel is filled layer by layer from bottom to top. The filling service string includes an upper sealing rod, a filling port, a sliding sleeve opening and closing tool disclosed in CN119553992A, and a lower sealing rod. The structure of the upper and lower sealing rods is the same as that of the steam injection insertion sealing rod. After the filling service tool reaches the bottom, the filling sliding sleeve is opened. When filling the lower layer, the upper sealing rod cooperates with the sealing cylinder to ensure a seal and prevent filling fluid from entering the upper layer. When filling the upper layer, the lower sealing rod of the filling service string cooperates with the sealing cylinder to ensure a seal and prevent filling fluid from entering the lower layer. When fracturing, filling, and sand control are completed for each layer, the filling sliding sleeve is closed during the lifting of the filling service tool, completing the fracturing, filling, and sand control of the entire well section.

[0045] After the steam injection string is lowered into place, the upper sliding sleeve is in the closed position, allowing direct steam injection into the lower layer. Figure 4 During the lowering process, steam injection is inserted into the sealing rod 2-2 to cooperate with the sealing cylinder to seal, which increases the lowering resistance, thereby confirming that the lowering is in place.

[0046] After the lower layer of steam injection is completed, a 35mm steel ball is thrown and lands at position 2-4 of the upper layer steam injection sleeve. Pressure buildup opens the upper layer steam injection channel, while simultaneously blocking the downward steam injection channel. Figure 5 As shown.

[0047] All components not discussed in detail in this application, as well as the connection methods of these components, are well-known technologies in this field. They can be directly applied and will not be elaborated further.

[0048] In this utility model, the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0049] In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0050] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0051] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A straight and inclined well separate layer filling sand control separate layer steam injection pipe column, comprising a sand control pipe column, a steam injection pipe column, characterized in that, The sand control string comprises, from top to bottom, an upper sand control screen pipe, an interlayer packer, and a lower sand control screen pipe; and the steam injection string comprises, from top to bottom, an upper steam injection switch, and a steam injection insertion sealing rod. The inner wall of the interlayer packer is provided with a sealing cylinder which is used to seal with the steam injection insertion sealing rod.

2. The sand control and separate layer steam injection pipe string for straight and inclined shaft separate layer filling according to claim 1, characterized in that, The steam injection string comprises, from top to bottom, a steam injection heat insulation pipe, an upper steam injection switch, a steam injection insertion sealing rod, and an open hole guide shoe.

3. The sand control and separate layer steam injection pipe string for straight and inclined shaft separate layer filling according to claim 2, characterized in that, The upper steam injection switch comprises a steam injection sliding sleeve shell which is tubular, and the wall of the steam injection sliding sleeve shell is provided with a steam injection port. The inner wall of the steam injection sliding sleeve shell is connected with a steam injection sliding sleeve through a shear pin, the steam injection sliding sleeve is sealed with the inner wall of the steam injection sliding sleeve shell, and the steam injection sliding sleeve covers and seals the steam injection port. The upper end of the steam injection sliding sleeve shell is provided with a steam injection upper joint, and the inner diameter of the steam injection upper joint is larger than the inner diameter of the steam injection sliding sleeve. The lower end of the steam injection sliding sleeve shell is connected with a steam injection lower joint through a limiting step, and the inner diameter of the steam injection lower joint is smaller than the outer diameter of the steam injection sliding sleeve.

4. The sand control and separate zone steam injection pipe string for straight and inclined shaft separate zone filling according to claim 2, characterized in that, The steam injection heat insulation pipe is connected with the upper steam injection switch through a lengthened oil pipe II, and the upper steam injection switch is connected with the steam injection insertion sealing rod through a lengthened oil pipe I.

5. The sand control and separate zone steam injection pipe string for straight and inclined shaft separate zone filling according to claim 2, characterized in that, The steam injection insertion sealing rod comprises an outer convex ring, and the outer wall of the outer convex ring is provided with rubber rings in an array.

6. The sand control and separate zone steam injection pipe string for straight and inclined shaft separate zone filling according to claim 1, characterized in that, The sand control string comprises, from top to bottom, a top packer, an upper filling sliding sleeve, an upper sand control screen pipe, an interlayer packer, a lower filling sliding sleeve, and a lower sand control screen pipe, and the lower end of the lower sand control screen pipe is connected with a solid shoe through a sand sinking tail pipe.

7. The sand control and separate zone steam injection pipe string for straight and inclined shaft separate zone filling according to claim 6, characterized in that, The top packer is a hanging and releasing packer.

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