Auxiliary device for putting tools into velocity string

Abstract

The utility model relates to an auxiliary device for putting a tool into a velocity tubular column, which comprises a mounting piece, a tool putting device, a tool putting device, a tool putting device and a tool putting device, and is characterized in that the mounting piece is suitable for sleeving a reserved pipe section of the velocity tubular column; the guide piece is connected with the installation piece, the guide piece is located between the inner diameter of the Christmas tree and the reserved pipe section, and the guide piece is provided with a large-diameter end matched with the inner diameter of the Christmas tree and a small-diameter end communicated with the speed pipe column; the small-caliber end is lower than the large-caliber end and not lower than the reserved pipe section, and a downhole tool put through steel wire rope operation is adopted through the paraffin removal gate valve on the top of the Christmas tree, sequentially passes through the large-caliber end and the small-caliber end of the guide piece and enters the speed pipe column. By additionally arranging the auxiliary device, the problem that in the prior art, due to the fact that a gap between the outer diameter of a speed pipe column and the inner diameter of a Christmas tree is too large, tools cannot be accurately and rapidly put into the speed pipe column can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of water drainage and gas production by velocity pipe string in gas field development and gas production technology, in particular to an auxiliary device for putting a tool into a velocity pipe string. Background Art

[0002] The velocity string is a small-diameter string that reduces the critical flow rate of liquid carrying in gas wells. It is suspended in the wellbore by a velocity string hanger and acts as a production string. When the formation fluid enters the velocity string driven by natural energy, the flow area is smaller than that of conventional production tubing. Under the condition of unchanged gas well production pressure, the flow area is reduced, and the velocity of the gas flowing through the flow area increases. When the gas flow velocity is greater than the critical flow rate of liquid carrying in the gas well, continuous liquid carrying is achieved. In the process of drainage and gas production in water-producing gas wells, it is often necessary to place downhole tools such as pressure gauges, logging tools, downhole throttling and atomizers into the velocity string to lay the foundation for the later production diagnosis of the gas well and the drainage and gas production process, thereby achieving long-term stable production of the gas well.

[0003] After the velocity string is hung on the velocity string hanger, the reserved pipe section on the velocity string is higher than the port of the velocity string hanger in the vertical direction, and the outer diameter of the velocity string is smaller than the inner diameter of the Christmas tree, and the difference between the two sizes is large. Therefore, when the tool is dropped from the wax cleaning gate at the top of the Christmas tree into the reserved pipe section of the velocity string, the tool will fall outside the reserved pipe section of the velocity string during the wire rope operation, or be shelved on the top of the reserved pipe section of the velocity string, resulting in the inability of the tool to enter the velocity string. As a result, it is impossible to diagnose the accumulation of liquid in the velocity string of the gas well, implement the placement of tools such as atomization drainage or plunger drainage, and therefore it is impossible to ensure the normal drainage and stable production of the gas well.

[0004] In order to solve the above problems, the utility model discloses an auxiliary device for dropping a tool into a velocity string. Utility Model Content

[0005] The utility model provides an auxiliary device for putting a tool into a velocity string, which is used for putting the tool into the velocity string.

[0006] The utility model provides an auxiliary device for placing a tool into a velocity string, comprising:

[0007] The mounting piece is suitable for being sleeved on the reserved pipe section of the velocity string;

[0008] A guide piece is connected to the mounting piece, the guide piece is located between the Christmas tree and the reserved pipe section, the guide piece has a large-diameter end matching the inner diameter of the Christmas tree, and a small-diameter end communicating with the outside of the reserved pipe section; the small-diameter end is lower than the large-diameter end and not lower than the top of the reserved pipe section, and the tool lowered into the reserved pipe section can pass through the large-diameter end and the small-diameter end of the guide piece in sequence under the wire rope operation, enter the reserved pipe section and pass through the velocity string to the preset position.

[0009] Optionally, the mounting member is a hollow tube sleeved outside the reserved pipe section, and the inner wall of the hollow tube is adapted to the outer wall of the reserved pipe section;

[0010] One end of the hollow tube is integrally connected to the small-diameter end of the guide member.

[0011] Furthermore, the radial dimension of the hollow tube is equal to the radial dimension of the small-diameter end of the guide member.

[0012] Optionally, the inner wall of the hollow tube and the outer wall of the reserved pipe section on the velocity string are bonded by an adhesive.

[0013] Optionally, the length of the hollow tube is 220 mm.

[0014] Optionally, the caliber of the guide member gradually decreases from top to bottom.

[0015] Furthermore, the guide member is cone-shaped or trumpet-shaped.

[0016] Optionally, the longitudinal height of the guide member is 50 mm.

[0017] Optionally, the outer diameter of the large-diameter end of the guide member is 76 mm and the inner diameter is 70.8 mm; and / or,

[0018] The outer diameter of the small-diameter end of the guide is 45.2 mm and the inner diameter is 40 mm.

[0019] Preferably, the outer diameter of the large-diameter end of the guide member is 76 mm and the inner diameter is 71 mm; and / or,

[0020] The outer diameter of the small-diameter end of the guide is 57 mm and the inner diameter is 52 mm.

[0021] Compared with the prior art, the advantages of the utility model are:

[0022] 1. The utility model adds auxiliary devices, and when it is necessary to put downhole tools such as pressure measuring tools, well logging tools, downhole throttling and atomizers into the velocity string, the downhole tools can enter the guide from the large-diameter end that matches the inner wall of the Christmas tree and enter the velocity string through the small-diameter section of the guide during the lowering process of the Christmas tree. This solves the problem in the prior art that the tools cannot be put into the velocity string due to the large gap between the outer diameter of the velocity string and the inner diameter of the Christmas tree.

[0023] 2. The installation process of the auxiliary device in the embodiment of the utility model is as follows:

[0024] After the velocity string is sealed and fixed by the velocity string hanger, the velocity string is cut. The part of the velocity string located above the velocity string hanger after cutting is the reserved pipe section, and the length of the reserved pipe section is generally 200mm. Then the hollow tubular mounting piece is sleeved outside the reserved pipe section of the velocity string, and the small-diameter end is not lower than the longitudinal height of the velocity string; then the high-strength welding adhesive with heat resistance and pressure resistance is used to bond and fix the velocity string near the lower part of the hollow tubular mounting piece. Finally, the Christmas tree is installed so that the auxiliary device is located between the velocity string and the Christmas tree, and the large-diameter end of the guide matches the inner diameter of the Christmas tree. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be described in more detail below based on embodiments and with reference to the accompanying drawings.

[0026] Figure 1 It is a schematic diagram of a wellhead device when a velocity string in the prior art is not installed with a Christmas tree;

[0027] Figure 2 It is a schematic diagram of a wellhead device after a velocity string is installed with a Christmas tree in the prior art;

[0028] Figure 3 It is a schematic diagram of a wellhead device when the velocity string installation auxiliary device is installed and the Christmas tree is not installed in the embodiment of the utility model;

[0029] Figure 4 It is a structural schematic diagram of the auxiliary device in the embodiment of the utility model.

[0030] Reference numerals:

[0031] 1. Auxiliary device; 11. Mounting piece; 12. Guide piece; 121. Large-diameter end; 122. Small-diameter end; 100. Speed ​​string; 101. Reserved pipe section; 200. Christmas tree; 300. Speed ​​string hanger. DETAILED DESCRIPTION

[0032] In the prior art, after the wellhead is sealed and the velocity string 100 is fixed in the wellbore by the velocity string hanger 300, the velocity string 100 is cut. The portion of the velocity string 100 above the velocity string hanger 300 after cutting is the reserved pipe section 101. The length of the reserved pipe section 101 is generally 200 mm. Figure 1 After the auxiliary device 1 is not installed and the Christmas tree 200 is directly installed, as shown in FIG. Figure 2 As shown, since there is a large gap between the outer wall of the reserved pipe section 101 and the inner wall of the Christmas tree 200, when the wax cleaning gate at the top of the Christmas tree 200 drops the tool into the reserved pipe section 101 through the wire rope, the tool may be difficult to align with the center of the reserved pipe section 101 during the wire rope operation, and may easily enter outside the reserved pipe section 101 of the velocity string, or may be placed on the top of the reserved pipe section 101, thereby causing the failure of the tool to be lowered into the velocity string.

[0033] The utility model will be further described below in conjunction with the accompanying drawings.

[0034] like Figure 3 and Figure 4 As shown, an embodiment of the utility model provides an auxiliary device 1 for placing a tool into a velocity string 100 , comprising a mounting member 11 and a guide member 12 .

[0035] Specifically, the mounting member 11 is used to be sleeved on the reserved pipe section 101 to play the role of straightening and fixing the auxiliary device 1. Optionally, the mounting member 11 is a hollow tube sleeved outside the reserved pipe section 101, and the inner wall of the hollow tube is adapted to the outer wall of the reserved pipe section 101.

[0036] The guide member 12 is connected to the mounting member 11. The guide member 12 is located inside the Christmas tree 200. The guide member 12 has a large-diameter end 121 that matches the inner diameter of the Christmas tree 200, and a small-diameter end 122 that communicates with the reserved pipe section 101. The small-diameter end 122 is lower than the large-diameter end 121 and not lower than the reserved pipe section 101. The tool dropped into the velocity string 100 can pass through the large-diameter end 121 and the small-diameter end 122 of the guide member 12 in sequence under the wire rope operation, enter the reserved pipe section 101, and fall to the designed depth position through the velocity string 100.

[0037] In the embodiment of the utility model, by adding the auxiliary device 1, when it is necessary to put downhole tools such as pressure measuring tools, well logging tools, downhole throttling and atomizer into the velocity string 100, the put downhole tools are sent through the wax cleaning gate at the top of the Christmas tree via a wire rope, and can enter the guide 12 through the large-diameter end 121 matched with the inner wall of the Christmas tree 200 and enter the reserved pipe section 101 through the small-diameter section of the guide 12. The problem in the prior art that the tools cannot be put into the velocity string 100 accurately and quickly due to the large gap between the outer diameter of the reserved pipe section 101 and the inner diameter of the Christmas tree 200 is solved.

[0038] In the embodiment of the utility model, the reserved pipe section 101 of the velocity string 100 located above the velocity string hanger 300 can be inserted into the hollow tubular mounting member 11. In order to ensure that the small-diameter end 122 is not lower than the longitudinal height of the reserved pipe section 101, the length of the hollow tube is slightly larger than the length of the reserved pipe section 101; optionally, the length of the hollow tube is 220 mm.

[0039] Optionally, one end of the hollow tube is integrally connected to the small-diameter end 122 of the guide 12. Optionally, the radial dimension of the hollow tube is equal to the radial dimension of the small-diameter end 122 of the guide 12. Optionally, the inner wall of the hollow tube and the outer wall of the reserved pipe section 101 are bonded by an adhesive.

[0040] Optionally, the caliber of the guide member 12 gradually decreases from top to bottom. Optionally, the guide member 12 is conical or trumpet-shaped. Optionally, the longitudinal height of the guide member 12 is S1, S1=50 mm.

[0041] The installation process of the auxiliary device 1 in the embodiment of the utility model is as follows:

[0042] After the velocity string 100 is fixed in the wellbore by the velocity string hanger 300, the velocity string 100 is cut. The portion of the velocity string 100 located above the velocity string hanger 300 after cutting is the reserved pipe section 101. The length of the reserved pipe section 101 is generally 200 mm. Figure 1 Then the hollow tubular mounting member 11 is sleeved on the reserved pipe section 101 of the velocity column 100, and the small-diameter end 122 is not lower than the longitudinal height of the reserved pipe section 101, as shown in FIG. Figure 3 Then, a heat-resistant and pressure-resistant strong welding adhesive is used to bond and fix the reserved pipe section 101 at a position near the lower part of the hollow tubular mounting member 11. Finally, the Christmas tree 200 is installed so that the auxiliary device 1 is located between the reserved pipe section 101 and the Christmas tree 200, and the large-diameter end 121 of the guide member 12 matches the inner diameter of the Christmas tree 200.

[0043] Since the formation water produced during the gas well production process contains chloride ions and the natural gas may contain corrosive gases, the auxiliary device 1 is made of stainless steel to prevent corrosion. Optionally, the wall thickness of the auxiliary device 1 is consistent with the wall thickness of the conventional CT70 velocity string.

[0044] The inner diameter of the Christmas tree 200 is generally 78mm. To ensure that the downhole tools can smoothly enter the guide 12, the outer diameter of the large-diameter end 121 of the guide 12 is close to the inner diameter of the Christmas tree. The length of the hollow tube is slightly longer than the reserved section 101, and the length of the hollow tube is set to S2, S2 = 220mm. At present, the velocity string 100 lowered into the gas well mainly has two specifications: 1.5″ and 2″: the outer diameter of the velocity string 100 with a specification of 1.5″ is generally Φ38.1mm, and the outer diameter of the velocity string 100 with a specification of 2″ is generally Φ50.8mm.

[0045] As an embodiment, the wall thickness of the hollow tube and the guide 12 are both 2.6 mm, wherein the outer diameter of the large-diameter end 121 of the guide 12 is 76 mm and the inner diameter is 70.8 mm; the outer diameter of the small-diameter end 122 of the guide 12 is 45.2 mm and the inner diameter is 40 mm. The radial dimension of the hollow tube is equal to the radial dimension of the small-diameter end 122 of the guide 12, that is, the outer diameter of the hollow tube is 45.2 mm and the inner diameter is 40 mm. The auxiliary device 1 for dropping a tool into the velocity string 100 is suitable for the velocity string 100 having an outer diameter of 1.5″ inserted into a gas well.

[0046] As another embodiment, the wall thickness of the hollow tube and the guide 12 are both 2.5 mm, the outer diameter of the large-diameter end 121 of the guide 12 is 76 mm, and the inner diameter is 71 mm; the outer diameter of the small-diameter end 122 of the guide 12 is 57 mm, and the inner diameter is 52 mm. The radial dimension of the hollow tube is equal to the radial dimension of the small-diameter end 122 of the guide 12, that is, the outer diameter of the hollow tube is 57 mm, and the inner diameter is 52 mm. The auxiliary device 1 for dropping a tool into the velocity string 100 is suitable for the velocity string 100 having an outer diameter of 2" inserted into a gas well.

[0047] Although the present invention has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present invention. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An auxiliary device for placing a tool into a velocity string, characterized in that: include: The mounting piece is suitable for being sleeved on the reserved pipe section of the velocity string; A guide piece is connected to the mounting piece, the guide piece is located between the Christmas tree and the reserved pipe section, the guide piece has a large-diameter end matching the inner diameter of the Christmas tree, and a small-diameter end communicating with the outside of the reserved pipe section; the small-diameter end is lower than the large-diameter end and not lower than the top of the reserved pipe section, and the tool lowered into the reserved pipe section can pass through the large-diameter end and the small-diameter end of the guide piece in sequence under the wire rope operation, enter the reserved pipe section and pass through the velocity string to the preset position.

2. The auxiliary device for placing a tool into a velocity string according to claim 1, characterized in that: The mounting piece is a hollow tube sleeved outside the reserved pipe section, and the inner wall of the hollow tube is adapted to the outer wall of the reserved pipe section; One end of the hollow tube is integrally connected to the small-diameter end of the guide member.

3. The auxiliary device for placing a tool into a velocity string according to claim 2, characterized in that: The radial dimension of the hollow tube is equal to the radial dimension of the small-diameter end of the guide member.

4. The auxiliary device for placing a tool into a velocity string according to claim 2 or 3, characterized in that: The inner wall of the hollow tube and the outer wall of the reserved pipe section on the velocity column are bonded by an adhesive.

5. The auxiliary device for placing a tool into a velocity string according to claim 2 or 3, characterized in that: The length of the hollow tube is 220 mm.

6. The auxiliary device for placing a tool into a velocity string according to any one of claims 1 to 3, characterized in that: The diameter of the guide member gradually decreases from top to bottom.

7. The auxiliary device for placing a tool into a velocity string according to claim 6, characterized in that: The guide piece is in a cone or trumpet shape.

8. The auxiliary device for placing a tool into a velocity string according to claim 7, characterized in that: The longitudinal height of the guide member is 50 mm.

9. The auxiliary device for placing a tool into a velocity string according to claim 7 or 8, characterized in that: The outer diameter of the large-diameter end of the guide member is 76 mm and the inner diameter is 70.8 mm; and / or, The outer diameter of the small-diameter end of the guide is 45.2 mm and the inner diameter is 40 mm.

10. The auxiliary device for placing a tool into a velocity string according to claim 9, characterized in that: The outer diameter of the large-diameter end of the guide member is 76 mm and the inner diameter is 71 mm; and / or, The outer diameter of the small-diameter end of the guide is 57 mm and the inner diameter is 52 mm.

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