Two-way Import Tool and Its Usage Method

Abstract

The present invention provides a two-way import tool and its usage method. The inner wall of the tail end of the upper joint is threadedly connected to the outer wall of the head end of the guide cylinder. The inner wall of the tail end of the guide cylinder is threadedly connected to the outer wall of the head end of the intermediate outer cylinder. The inner wall of the tail end of the intermediate outer cylinder is threadedly connected to the outer wall of the head end of the lower short section. A guide cone is machined inside the tail end of the lower short section. The outer wall of the tail end of the guide lock is threadedly connected to the inner wall of the first section of the upper body guide. The inner wall of the tail end of the upper body guide is threadedly connected to the outer wall of the head end of the guide sleeve. A slope is formed at the lower part of the guide sleeve. This tool can meet the requirements of main and branch wellbore production operations and water injection operations without moving the pipe string. The guide sleeve adopts a 1° inclined plane to achieve the offset of the central axis. The lower short section adopts a double-hole structure and a guide cone design. Through the 180° branch wellbore guide sleeve, the channel import of the main and branch wellbores is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of upper completion technology for double-tubing in oilfields, and more specifically to a two-way introduction tool and its usage method. Background Art

[0002] At present, the common upper completion technologies for multi-lateral wells in offshore oilfields are single-tubing completion or double-tubing completion. Single-tubing completion cannot intervene in the production layers of the branch wellbores; in the case of double-tubing completion of production wells, only the main wellbore can be independently intervened without moving the completion string, which seriously affects the production layer treatment efficiency and productivity, and the operation cost is relatively high. Summary of the Invention

[0003] The present invention overcomes the deficiencies in the prior art. In the case of double-tubing completion of production wells, only the main wellbore can be independently intervened without moving the completion string, which seriously affects the production layer treatment efficiency and productivity, and the operation cost is relatively high. The present invention provides a two-way introduction tool and its usage method. This tool can meet the requirements of production operations and water injection operations in the main and branch wellbores without moving the pipe string. The guiding sleeve adopts a 1° inclined plane to achieve the offset of the central axis. The lower short section adopts a double-hole structure and a guiding cone design. Through the 180° guiding sleeve of the branch wellbore, the channel introduction of the main and branch wellbores is realized.

[0004] The object of the present invention is achieved by the following technical solutions.

[0005] The two-way introduction tool includes an outer structure and an inner structure.

[0006] The outer structure includes an upper joint, a guiding cylinder, an intermediate outer cylinder, and a lower short section. The inner wall of the tail end of the upper joint is threadedly connected to the outer wall of the head end of the guiding cylinder. A groove is provided on the inner wall of the middle part of the upper joint, and a locking block is arranged in the groove to achieve positioning between the upper joint and the guiding lock through the locking block. The inner wall of the tail end of the guiding cylinder is threadedly connected to the outer wall of the head end of the intermediate outer cylinder. The inner wall of the tail end of the intermediate outer cylinder is threadedly connected to the outer wall of the head end of the lower short section. A guiding cone is machined inside the tail end of the lower short section.

[0007] The inner structure includes a guiding lock, an upper body guide, and a guide sleeve. The outer wall at the tail end of the guiding lock is threadedly connected to the inner wall at the first section of the upper body guide. A first groove is formed on the outer wall at the upper part of the guiding lock, and a positioning dust-proof ring is installed in the first groove. A second groove is formed on the outer wall at the middle part of the guiding lock, and the locking spring is installed in the second groove. The locking upper joint is sleeved on the outer wall at the middle part of the guiding lock, and the left end face of the locking spring is in contact and cooperation with the inner end face of the locking upper joint. A shear groove is formed on the outer wall at the lower part of the guiding lock, and a shear ring is arranged on the outer wall at the lower part of the guiding lock. The shear ring and the shear groove achieve a shearing effect. The inner wall at the tail end of the upper body guide is threadedly connected to the outer wall at the first section of the guide sleeve, and a slope is formed at the lower part of the guide sleeve.

[0008] A necking section is formed on the outer wall at the first section of the guide cylinder. A lower guiding inclined surface is machined at the first section of the necking section. A positioning groove is formed on the outer wall of the necking section. An upper guiding inclined surface is machined on the outer wall at the upper part of the guide sleeve. The upper guiding inclined surface is in cooperation with the lower guiding inclined surface. A positioning key is machined on the outer wall at the upper part of the guide sleeve. The positioning key and the positioning groove cooperate to realize the positioning of the guide sleeve.

[0009] The shear ring adopts a six-component segmented arc structure, and a supplementary locking ring is installed between adjacent arc structures.

[0010] A structure with a 70° included angle is formed axially in the middle at the first section of the guiding cone.

[0011] A semi-moon guiding structure is formed inside the tail end of the guide sleeve, and a 1° slope is machined on the inner wall at the open end of the semi-moon guiding structure.

[0012] A first fixing pin is arranged between the upper joint and the guide cylinder to position the relative position between the upper joint and the guide cylinder.

[0013] A second fixing pin is arranged between the intermediate outer cylinder and the lower short section to position the relative position between the intermediate outer cylinder and the lower short section.

[0014] The usage method of the two-way guiding tool is carried out according to the following steps:

[0015] Step 1: Lower the above-mentioned two-way guiding tool to a position above the branch position of the main wellbore and the branch wellbore.

[0016] Step 2: The service tool sequentially enters the main wellbore through the guiding lock, the upper body guide, the main wellbore guide sleeve, the lower short section, and the guiding cone, and then carries out production and water injection operations on the main wellbore.

[0017] Step 3: Recover the main wellbore guide sleeve with a special tool and re-lower the 180° branch wellbore guide sleeve. The service tool enters the branch wellbore through sequential guide locking, upper body guiding, branch wellbore guide sleeve, lower short section, and guide cone, enabling production and water injection operations in the branch wellbore.

[0018] The beneficial effects of the present invention are as follows: Compared with the existing single-tube completion or double-tube completion, the single-tube completion cannot intervene in the pay zone of the branch well section; the double-tube completion can only independently intervene in the main wellbore without moving the completion string, which has limitations. The present invention provides a two-way guiding tool that can meet the requirements of production and water injection operations in the main and branch wellbores without moving the pipe string, achieving intervention operations in the branch wellbore. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural diagram of the present invention;

[0020] Figure 2 is a schematic structural diagram of the positioning of the guiding inclined surface and the guiding groove in the present invention;

[0021] Figure 3 is a schematic structural diagram of the automatic locking segmented shear ring;

[0022] Figure 4 is a schematic structural diagram of two-way guiding;

[0023] Figure 5 is a schematic structural diagram of semi-moon guiding;

[0024] Figure 6 is a schematic structural diagram of the main / branch wellbore commutation;

[0025] Figure 7 is a schematic structural diagram of the two-way guiding tool string;

[0026] In the figure: 1 is the upper sub, 2 is the upper body guiding, 3 is the guiding cylinder, 4 is the guide sleeve, 5 is the intermediate outer cylinder, 6 is the lower short section, 7 is the guide locking, 8 is the locking ring, 9 is the locking upper sub, 10 is the locking spring, 11 is the locking block, 12 is the shear ring, 13 is the first fixing pin, 14 is the second fixing pin, 15 is the dust seal, 16 is the upper guiding inclined surface, 17 is the positioning key, 18 is the lower guiding inclined surface, 19 is the positioning groove, 20 is the supplementary locking ring, 21 is the first groove, 22 is the second groove, 23 is the shear groove, 24 is the guide cone, 25 is the slope, and 26 is the semi-moon guiding structure.

[0027] For those of ordinary skill in the art, other related drawings can be obtained based on the above drawings without creative efforts. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] The technical solution of the present invention will be further described below through specific embodiments.

[0029] Embodiment 1

[0030] The two-way import tool includes an outer structure and an inner structure.

[0031] The outer structure includes an upper joint 1, a guide cylinder 3, an intermediate outer cylinder 5, and a lower short section 6. The inner wall of the tail end of the upper joint 1 is threadedly connected to the outer wall of the head end of the guide cylinder 3. A groove is provided on the inner wall of the middle part of the upper joint 1, and a locking block 11 is arranged in the groove. Positioning is achieved between the upper joint 1 and the guide lock 7 through the locking block 11. The inner wall of the tail end of the guide cylinder 3 is threadedly connected to the outer wall of the head end of the intermediate outer cylinder 5. The inner wall of the tail end of the intermediate outer cylinder 5 is threadedly connected to the outer wall of the head end of the lower short section 6. A guide cone 24 is machined inside the tail end of the lower short section 6.

[0032] The inner structure includes a guide lock 7, an upper body guide 2, and a guide sleeve 4. The outer wall of the tail end of the guide lock 7 is threadedly connected to the inner wall of the first section of the upper body guide 2. A first groove 21 is provided on the outer wall of the upper part of the guide lock 7, and a positioning dust-proof ring is installed in the first groove 21. A second groove 22 is provided on the outer wall of the middle part of the guide lock 7, and a lock spring 10 is installed in the second groove 22. The locking upper joint 9 is sleeved on the outer wall of the middle part of the guide lock 7, and the left end face of the lock spring 10 is in contact and cooperation with the inner end face of the locking upper joint 9. A shear groove 23 is provided on the outer wall of the lower part of the guide lock 7, and a shear ring 12 is arranged on the outer wall of the lower part of the guide lock 7. The shear ring 12 and the shear groove 23 achieve a shearing effect. The inner wall of the tail end of the upper body guide 2 is threadedly connected to the outer wall of the head end of the guide sleeve 4. A slope 25 is formed at the lower part of the guide sleeve 4.

[0033] Embodiment 2

[0034] Based on Embodiment 1, a necking section is formed on the outer wall of the head end of the guide cylinder 3. A lower guide slope 18 is machined at the head end of the necking section. A positioning groove 19 is provided on the outer wall of the necking section. An upper guide slope 16 is machined on the outer wall of the upper part of the guide sleeve 4. The upper guide slope 16 cooperates with the lower guide slope 18. A positioning key 17 is machined on the outer wall of the upper part of the guide sleeve 4. The positioning key 17 cooperates with the positioning groove 19 to achieve the positioning of the guide sleeve 4.

[0035] The shear ring 12 adopts a 6-component segmented arc structure, and a supplementary lock ring 20 is installed between adjacent arc structures.

[0036] Embodiment 3

[0037] Based on Embodiment 2, a structure with a 70° angle is formed axially in the middle of the head end of the guide cone 24.

[0038] The inner end of the guide sleeve 4 forms a semi-circular guide structure 26, and a 1° slope is machined on the inner wall of the open end of the semi-circular guide structure 26.

[0039] A first fixing pin 13 is arranged between the upper joint 1 and the guide cylinder 3 for positioning the relative positions between the upper joint 4 and the guide cylinder 3.

[0040] A second fixing pin 14 is arranged between the middle outer cylinder 5 and the lower short section 6 for positioning the relative positions between the middle outer cylinder 5 and the lower short section 6.

[0041] Example 4

[0042] The usage method of the two-way introduction tool is carried out according to the following steps:

[0043] Step 1: Lower the above-mentioned two-way introduction tool to a position above the branch position of the main wellbore and the branch wellbore.

[0044] Step 2: The service tool sequentially enters the main wellbore through guide locking, upper body guiding, the main wellbore guide sleeve, the lower short section, and the guide cone, and then carries out production and water injection operations on the main wellbore.

[0045] Step 3: Recover the main wellbore guide sleeve through a special tool and re-lower the 180° branch wellbore guide sleeve. The service tool enters the branch wellbore through guide locking, upper body guiding, the branch wellbore guide sleeve, the lower short section, and the guide cone in sequence, and can carry out production and water injection operations on the branch wellbore.

[0046] For ease of explanation, in the embodiments, spatial relative terms such as "upper", "lower", "left", and "right" are used to describe the relationship between one element or feature shown in the figure and another element or feature. It should be understood that in addition to the orientation shown in the figure, the spatial terms are intended to include different orientations during the use or operation of the device. For example, if the device in the figure is inverted, the element described as being "below" other elements or features will be positioned "above" other elements or features. Therefore, the exemplary term "lower" can include both upper and lower orientations. The device can be positioned in other ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used here can be interpreted accordingly.

[0047] Moreover, relative relationship terms such as "first" and "second" are only used to distinguish one component with the same name from another, and do not necessarily require or imply any such actual relationship or order between these components.

[0048] The above has described the present invention in detail, but the above content is only a preferred embodiment of the present invention and should not be considered as limiting the scope of implementation of the present invention. All equivalent changes and improvements made according to the scope of application of the present invention should still fall within the scope covered by the patent of the present invention.

Claims

1. Two-way import tool, characterized in that: It includes an outer structure and an inner structure. The outer structure includes an upper joint, a guide tube, an intermediate outer tube, and a lower short section. The inner wall of the tail end of the upper joint is threadedly connected to the outer wall of the head end of the guide tube. A groove is provided on the inner wall of the middle part of the upper joint, and a locking block is arranged in the groove to position between the upper joint and the guide locking. The inner wall of the tail end of the guide tube is threadedly connected to the outer wall of the head end of the intermediate outer tube, and the inner wall of the tail end of the intermediate outer tube is threadedly connected to the outer wall of the head end of the lower short section. A guide cone is machined inside the tail end of the lower short section. The inner structure includes a guide locking, an upper body guide, and a guide sleeve. The outer wall of the tail end of the guide locking is threadedly connected to the inner wall of the first section of the upper body guide. A first groove is provided on the outer wall of the upper part of the guide locking, and a positioning dust ring is installed in the first groove. A second groove is provided on the outer wall of the middle part of the guide locking, and a lock spring is installed in the second groove. The locking upper joint is sleeved on the outer wall of the middle part of the guide locking, and the left end face of the lock spring is in contact and cooperation with the inner end face of the locking upper joint. A shear groove is provided on the outer wall of the lower part of the guide locking, and a shear ring is arranged on the outer wall of the lower part of the guide locking. The shear ring and the shear groove achieve a shearing effect. The inner wall of the tail end of the upper body guide is threadedly connected to the outer wall of the head end of the guide sleeve, and a slope is formed at the lower part of the guide sleeve.

2. The two-way import tool according to claim 1, wherein: A necking section is formed on the outer wall of the head end of the guide tube. A lower guide inclined surface is machined at the head end of the necking section, and a positioning groove is provided on the outer wall of the necking section. An upper guide inclined surface is machined on the outer wall of the upper part of the guide sleeve. The upper guide inclined surface is matched with the lower guide inclined surface. A positioning key is machined on the outer wall of the upper part of the guide sleeve, and the positioning key is matched with the positioning groove to position the guide sleeve.

3. The two-way import tool according to claim 1, wherein: The shear ring adopts a 6-component segmented circular arc structure, and a supplementary lock ring is installed between adjacent circular arc structures.

4. The two-way import tool according to claim 1, characterized in that: The middle part of the head end of the guide cone forms a structure with a 70° included angle along the axial direction.

5. The two-way import tool according to claim 1, characterized in that: A semi-moon guide structure is formed inside the tail end of the guide sleeve, and a 1° slope is machined on the inner wall of the open end of the semi-moon guide structure.

6. The two-way import tool according to claim 1, characterized in that: A first fixing pin is arranged between the upper joint and the guide tube to position the relative position between the upper joint and the guide tube.

7. The two-way import tool according to claim 1, wherein: A second fixing pin is arranged between the intermediate outer tube and the lower short section to position the relative position between the intermediate outer tube and the lower short section.

8. The method for using the two-way import tool according to any one of claims 1-7, characterized in that: It is carried out according to the following steps: Step 1: Lower the above-mentioned two-way introduction tool to a position above the branch position of the main wellbore and the branch wellbore. Step 2: The service tool sequentially passes through the guide locking, the upper body guide, the main wellbore guide sleeve, the lower short section, and the guide cone to enter the main wellbore, and then carries out production and water injection operations on the main wellbore. Step 3: Recover the main wellbore guide sleeve through a special tool and re-lower the 180° branch wellbore guide sleeve. The service tool passes through the guide locking, the upper body guide, the branch wellbore guide sleeve, the lower short section, and the guide cone in sequence to enter the branch wellbore, and production and water injection operations can be carried out on the branch wellbore.

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