A special threaded connection positioning tool for surface casing head and its use method

Abstract

The invention relates to a special threaded connection positioning tool for a surface casing head, comprising a male thread adapter and a female thread adapter. The surfaces of the male thread adapter and the female thread adapter are both provided with sealing threads in the length direction. The male thread adapter and the female thread adapter are respectively adapted to the same double male short sections of casing and casing heads with the same lengths. When the tool is used, the male thread adapter and the double male short sections of casing are matched with marking lines, the female thread adapter and the casing head are matched with marking lines, and then screwing and positioning are performed according to the marking lines. The invention solves the positioning problem of using special threads when installing a surface casing head, facilitates engineering construction, can ensure that the special threads are screwed in place, and is beneficial to construction safety.

Description

Technical Field

[0001] The invention belongs to the technical field of casing head coupling screwing and positioning, and in particular relates to a special thread screwing and positioning tool for a surface casing head and a use method thereof. Background Art

[0002] In the field of petroleum industry, the direction of the casing head of the surface casing needs to be determined during installation, and the surface casing mostly uses API BC buckles. The API BC buckle has a wide range of screw-on positions, and the judgment is based on the position. The distance from the bottom of the triangle to -5.08mm or +9.52mm meets the requirements of the API BC buckle. If the direction of the casing head does not meet the requirements after screwing, the direction requirements of the casing head can be met by continuing to increase the torque.

[0003] The characteristic of the special buckle for airtight sealing is that the buckle is determined by the torque shoulder aligning. After the shoulder aligns, increasing the torque cannot further increase the screw-in angle, resulting in the failure to meet the directional requirements of the surface casing head.

[0004] Therefore, based on these problems, it is of great practical significance to provide a special threaded positioning tool and a method for using the surface casing head that can meet the special buckle requirements and the directional requirements of engineering construction. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a special threaded connection positioning tool for a surface casing head that can meet both the special threading requirements and the directional requirements of engineering construction and a method of use.

[0006] The present invention solves the technical problem by adopting the following technical solutions:

[0007] A special threaded connection positioning tool for a surface casing head, comprising a male thread adapter and a female thread adapter, both of which are arc-shaped structures with a certain thickness, and the surfaces of the male thread adapter and the female thread adapter are provided with sealing threads in the length direction, the male thread adapter and the female thread adapter are respectively adapted to the same double male short section and casing head with the same length, and the male thread adapter and the female thread adapter are respectively provided with an inner top shoulder and an outer top shoulder;

[0008] The width of the male thread adapter and the female thread adapter is W=(D-2×t)×tgθ, where W is the adapter width, D is the nominal outer diameter of the casing, t is the nominal wall thickness of the casing, and θ is the angle, which is 5° to 10°.

[0009] The method for screwing and positioning the surface casing head using a special thread screwing and positioning tool for the surface casing head includes the following steps:

[0010] Use a female thread adapter to adapt the surface casing head thread. After the female thread adapter contacts the casing head box shoulder without any gap, draw two paint strip lines along the axial direction on the outer surface of the casing head parallel to the two side walls of the female thread adapter. The width between the two paint strip lines is consistent with the width of the female thread adapter, both of which are W;

[0011] The casing string is connected to the casing head through a casing double male short joint, and the male thread adapter is matched with the male buckle of the casing double male short joint. After the male thread adapter and the casing male buckle shoulder are in contact without gap, a paint tape line is drawn along the circumferential direction of the casing on the male end of the casing double male short joint with the thread side end face of the male thread adapter as the reference; a longitudinal paint tape line is drawn along the axial direction of the casing double male short joint with the axial center line of the male thread adapter as the reference, and the two paint tape lines are perpendicular;

[0012] After drawing the lines, remove the male thread adapter and the female thread adapter, connect the double male nipple of casing to the casing head and the casing string respectively, and screw them together until the axial paint line of the double male nipple of casing falls between the two paint lines on the outer surface of the casing head, and the paint line in the circumferential direction of the double male nipple of casing coincides with the end face of the casing head coupling.

[0013] The advantages and positive effects of the present invention are:

[0014] The screwing positioning tool and the use method of the present invention solve the positioning problem of using special threads for installing a surface casing head, facilitate engineering construction, and can ensure that the special threads are screwed in place, which is beneficial to construction safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments, but it should be understood that these drawings are designed only for explanation purposes and are not intended to limit the scope of the present invention. In addition, unless otherwise specified, these drawings are intended only to conceptually illustrate the structural configurations described herein and are not necessarily drawn to scale.

[0016] Figure 1 It is an axial structural cross-sectional view of a special threaded connection positioning tool for a surface casing head using the present invention in an embodiment;

[0017] Figure 2 A top view of a special threaded connection positioning tool for a surface casing head provided in an embodiment of the present invention;

[0018] Figure 3 A diagram showing the matching of a female thread adapter and a casing head provided in an embodiment of the present invention;

[0019] Figure 4 A male thread adapter and a male buckle adaptation diagram of a double male nipple of a casing provided in an embodiment of the present invention; DETAILED DESCRIPTION

[0020] First of all, it should be noted that the specific structure, features and advantages of the present invention will be specifically described below by way of example, but all descriptions are only for illustration and should not be understood as limiting the present invention in any way. In addition, any single technical feature described or implied in the embodiments mentioned herein, or any single technical feature displayed or implied in the drawings, can still be combined or deleted between these technical features (or their equivalents) to obtain more other embodiments of the present invention that may not be directly mentioned in this document. In addition, in order to simplify the drawings, the same or similar technical features may be marked only in one place in the same drawing.

[0021] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the invented product is usually placed when in use, which 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 position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present invention. It should be noted that the embodiments and features in the embodiments in this application can be combined with each other without conflict.

[0022] The following is combined Figure 1-4 The present invention will be described in detail.

[0023] like Figure 1-4 As shown, embodiments 1 and 2 provide a special threaded connection positioning tool for a surface casing head, comprising a male thread adapter 1 and a female thread adapter 2, wherein the male thread adapter 1 and the female thread adapter 2 are both arc-shaped structures with a certain thickness, and the surfaces of the male thread adapter 1 and the female thread adapter 2 are both provided with sealing threads 3 in the length direction, and the double male nipples and casing heads of the male thread adapter and the female thread adapter are respectively adapted to the same and consistent in length, and the male thread adapter and the female thread adapter are respectively provided with inner top shoulders and outer top shoulders;

[0024] The width of the male thread adapter and the female thread adapter is W=(D-2×t)×tgθ, where W is the adapter width, D is the nominal outer diameter of the casing, t is the nominal wall thickness of the casing, and θ is the angle, which is 5° to 10°.

[0025] The method for screwing and positioning the surface casing head using a special thread screwing and positioning tool for the surface casing head includes the following steps:

[0026] The surface casing head thread is adapted by the female thread adapter 2. After the female thread adapter contacts the female buckle shoulder of the casing head 5 without any gap, two paint strip lines S1 are drawn on the outer surface of the casing head 5 along the axial direction parallel to the two side walls of the female thread adapter. The width between the two paint strip lines S1 is consistent with the width of the female thread adapter, which is W.

[0027] The casing string is connected to the casing head through a casing double male short joint, and the male thread adapter is matched with the male buckle of the casing double male short joint. After the male thread adapter and the casing male buckle shoulder are in contact without gap, a paint strip line S2 is drawn along the circumferential direction of the casing at the male end of the casing double male short joint with the thread side end face of the male thread adapter as a reference; a longitudinal paint strip line S3 is drawn along the axial direction of the casing double male short joint with the axial center line 4 of the male thread adapter as a reference, and the two paint strip lines are perpendicular;

[0028] After drawing the lines, remove the male thread adapter and the female thread adapter, connect the double male nipple of casing to the casing head and the casing string respectively, and screw them together until the axial paint line of the double male nipple of casing falls between the two paint lines on the outer surface of the casing head, and the paint line in the circumferential direction of the double male nipple of casing coincides with the end face of the casing head coupling.

[0029] The above embodiments describe the present invention in detail, but the contents are only preferred embodiments of the present invention and cannot be considered to limit the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the present invention.

Claims

1. A surface casing head screwing and positioning method, characterized by: The method is carried out by using a special threaded connection positioning tool on the surface casing head, the positioning tool comprises a male thread adapter and a female thread adapter, the male thread adapter and the female thread adapter are both arc-shaped structures with a certain thickness, and the surfaces of the male thread adapter and the female thread adapter are both provided with sealing threads in the length direction, the male thread adapter and the female thread adapter are respectively adapted to the same double male short section and casing head with the same length, and the male thread adapter and the female thread adapter are respectively provided with an inner top shoulder and an outer top shoulder; The width of the male thread adapter and the female thread adapter is W=(D-2×t) ×tgθ, W is the adapter width, D is the nominal outer diameter of the casing, t is the nominal wall thickness of the casing, and θ is the angle, which is 5°~10°; The method comprises the following steps: Use a female thread adapter to adapt the surface casing head thread. After the female thread adapter contacts the casing head box shoulder without any gap, draw two paint strip lines along the axial direction on the outer surface of the casing head parallel to the two side walls of the female thread adapter. The width between the two paint strip lines is consistent with the width of the female thread adapter, both of which are W; The casing string is connected to the casing head through a casing double male short joint, and the male thread adapter is matched with the male buckle of the casing double male short joint. After the male thread adapter and the casing male buckle shoulder are in contact without gap, a paint tape line is drawn along the circumferential direction of the casing on the male end of the casing double male short joint with the thread side end face of the male thread adapter as the reference; a longitudinal paint tape line is drawn along the axial direction of the casing double male short joint with the axial center line of the male thread adapter as the reference, and the two paint tape lines are perpendicular; After drawing the lines, remove the male thread adapter and the female thread adapter, connect the double male nipple of casing to the casing head and the casing string respectively, and screw them together until the axial paint line of the double male nipple of casing falls between the two paint lines on the outer surface of the casing head, and the paint line in the circumferential direction of the double male nipple of casing coincides with the end face of the casing head coupling.

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