A new type of well bottom detection impression

Abstract

The utility model belongs to oil well detection technical field, concretely relates to a novel well bottom detection impression. The novel well bottom detection impression includes positioning sleeve, joint inner core and the impression body that is composed of soft solid metal, positioning sleeve upper end is equipped with end cover, the through hole that supplies the pipe column is set in the middle of end cover and passes, joint inner core top sets up the insertion hole, the pipe column end part is connected through the thread with insertion hole, spring is connected between joint inner core and end cover, spring is sleeved in the outside of pipe column, the impression body is located between joint inner core and positioning sleeve, the upper portion of impression body is connected with joint inner core, the lower end of impression body can extend positioning sleeve, this novel well bottom detection impression assembly disassembly is convenient, the impression body can be in the telescopic sleeve, has the characteristics such as protection impression, quick replacement, extraction efficiency is high.

Description

Technical Field

[0001] This utility model belongs to the field of oil well detection technology, specifically relating to a new type of bottom hole detection impression. Background Technology

[0002] In oil well operations, when downhole tools or tubing break or fall, forming "fallen fish," engineers are in a "blind" state, and the impression device becomes their "eyes." Therefore, the impression device has become an important accident diagnosis tool in oilfield downhole operations. It is mainly used to obtain accurate surface morphology information of downhole fish (such as broken drill strings, tools, casing, etc.) or obstacles at the bottom of the well. The bottom impression provides a key basis for formulating salvage or repair plans.

[0003] Existing impression devices have a simple structure, with the upper end connected to power equipment such as pipe strings. During the process of going down into the well and imprinting, the impression body is prone to problems such as falling off or the impression deforming due to collision. In order to improve the connection strength of the impression body, some impressions are fixed or cast inside the equipment. This structural form is not convenient for timely extraction of the impression, and the impression body cannot be replaced quickly. The processing, use and maintenance costs are high, resulting in poor economic benefits. Utility Model Content

[0004] The purpose of this invention is to provide a novel well bottom detection method that is easy to assemble and disassemble, and whose imprint body can be extended and retracted by the sleeve, and features protection of imprints, quick replacement, and high extraction efficiency.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A novel bottom-hole exploration impression includes a positioning sleeve, a connector inner core, and an impression body made of soft solid metal. The positioning sleeve has an end cap at its upper end, with a through hole in the middle for the tubing string to pass through. The connector inner core has an insertion hole at its upper part, and the end of the tubing string is threadedly connected to the insertion hole. A spring connects the connector inner core and the end cap, and the spring is fitted around the tubing string. The impression body is positioned between the connector inner core and the positioning sleeve, with its upper part connected to the connector inner core and its lower end extending out of the positioning sleeve.

[0006] Additional technical features constituting the above-mentioned novel bottom-hole exploration impression include: —The inner side of the edge of the end cap is connected to the outer side of the port of the positioning sleeve by a thread, or the edge of the end cap is connected to the port of the positioning sleeve by a number of bolts; —The impression body and the inner core of the connector are connected by a threaded structure, or the inner core of the connector is provided with several annular bosses on its exterior, and the impression body is covered and fixed on the annular bosses; —A plurality of vertical guide rails are provided between the outer side of the mold body and the positioning sleeve. The guide rails are composed of convex strips and grooves, which are respectively provided on the outer side of the mold body and the inner wall of the positioning sleeve. —The connector inner core and the impression body are provided with vertically continuous water eye channels, and the water eye channels are connected to the insertion holes of the connector inner core.

[0007] Compared with the prior art, the novel bottom-of-well exploration impression provided by this utility model has the following advantages: The impression body of the novel impression is placed inside the positioning sleeve, and its upper end is connected to the inner core of the connector. After the inner core of the connector is connected to the power string, the lower end of the impression body can extend out of the positioning sleeve for full imprinting. When the pipe is pulled out, the imprint retracts into the positioning sleeve, thereby effectively protecting the imprint and preventing the impression body from falling off. Since a spring is provided between the inner core of the connector and the end cap at the upper end of the positioning sleeve, the automatic extension and retraction movement of the impression body is realized. Secondly, the end cap and the positioning sleeve, and the inner core of the connector and the impression body can all be detachable connection structures, such as bolts, threads, or snap-fit ​​methods, which are convenient for assembly and disassembly, and can also replace new impression bodies in a timely manner, improving the working efficiency of the impression. It has the advantages of compact structure, convenient use, economy and durability. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the structure of a novel well bottom detection impression according to this utility model. Detailed Implementation

[0009] The structure and working principle of the novel well bottom detection impression provided by this utility model will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0010] In the description of this utility model, unless otherwise stated, the terms "upper / lower", "inner / outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0011] It should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "set / equipped" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to 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 based on the specific circumstances.

[0012] like Figure 1 As shown, the structure of this new type of bottom hole exploration impression includes a positioning sleeve 1, a connector inner core 2, and an impression body 3 made of soft solid metal. The upper end of the positioning sleeve 1 is provided with an end cap 11, and the middle of the end cap 11 is provided with a through hole 12 for the tubing string a to pass through. The upper part of the connector inner core 2 is provided with an insertion hole 21, and the end of the tubing string is connected to the insertion hole 21 by a thread 20. A spring 4 is connected between the connector inner core 2 and the end cap 11. The spring 4 is fitted outside the tubing string a. The impression body 3 is placed between the connector inner core 2 and the positioning sleeve 1. The upper part of the impression body 3 is connected to the connector inner core 2, and the lower end of the impression body 3 can extend out of the positioning sleeve 1.

[0013] Its working principle is as follows: The positioning sleeve 1 of the device is provided with an end cap 11 at the upper end. The power string a extends into the through hole 12 and is connected to the insertion hole 21 at the upper end of the connector core 2 inside the sleeve by a thread 20. After the positioning sleeve 1 reaches the expected position at the bottom of the well, the connector core 2 is pressed down and the imprint body 3 located below it extends out of the positioning sleeve 1 to imprint the "fish falling" area. Soft solid metal, such as columnar solid lead (purity > 99.9%), has low hardness and good plasticity, and is easy to leave imprints. After the imprint is completed, the pipe is started by the string to start the pipe lifting action. Since there is a spring 4 between the end cap 11 and the connector core 2, after it retracts, it retracts the imprint body 3 into the positioning sleeve 1, protecting the imprint and preventing the imprint body 3 from falling off.

[0014] In the structure constituting the aforementioned novel bottom-hole detection impression, —The end cap 11 and the positioning sleeve 1 are preferably connected in a detachable manner. For example, the inner side of the edge of the end cap 11 is connected to the outer side of the port of the positioning sleeve 1 by a thread, or the edge of the end cap 11 is connected to the port of the positioning sleeve 1 by several bolts 13. That is, after the end cap 11 is positioned, it can limit the inner core 2 of the connector. After connecting the spring 4, the tension extension and contraction of the two are realized. Secondly, it is convenient to combine and assemble, and it is quicker to replace the inner core 2 of the connector and the mold body 3. —Furthermore, the aforementioned impression body 3 and the inner core 2 of the connector are connected by a threaded structure or the inner core 2 of the connector is provided with several annular bosses 22. The impression body 3 is covered and fixed on the annular bosses 22. The annular bosses 22 enhance the stability of the impression body 3 and prevent it from falling off during the expansion and contraction process. The threaded structure facilitates the installation and disassembly of the impression body 3 and makes the impression extraction convenient. — Preferably, a plurality of vertical guide rails 5 are provided between the outer side of the above-mentioned mold body 3 and the positioning sleeve 1. The guide rails 5 are composed of convex strips and grooves. The convex strips and grooves are respectively provided on the outer side of the mold body 3 and the inner wall of the positioning sleeve 1. The guide rails 5 can ensure that the vertical extension and contraction of the mold body 3 is smooth and regular, and avoid the problem of end deformation caused by the change of the movement trajectory of the mold body 3 after being pressed and squeezing against the side wall of the positioning sleeve 1. Furthermore, the aforementioned connector inner core 2 and impression body 3 are provided with vertically continuous water eye channels 6. The water eye channels 6 are connected to the insertion holes 21 of the connector inner core 2. Through the water eye channels 6, the bottom of the well can be flushed, and the pressure difference between the inside and outside of the tubing can be prevented from being unbalanced, thus avoiding the phenomenon of "one pipe being pulled out and another popping out" when pulling out the tubing, and protecting the surface environment from pollution.

[0015] The above-described embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit the implementation of this utility model. Therefore, any other modifications or equivalent substitutions to the technical solution of this utility model, as long as they do not depart from the spirit and scope of the technical solution of this utility model, should be covered within the scope of the claims of this utility model.

Claims

1. A novel bottom-of-well exploration impression, comprising a positioning sleeve, a connector inner core, and an impression body made of soft solid metal, characterized in that: The positioning sleeve has an end cap at its upper end, and the end cap has a through hole in the middle for the tube column to pass through. The inner core of the connector has an insertion hole above it. The end of the tube column is connected to the insertion hole by a thread. A spring is connected between the inner core of the connector and the end cap. The spring is fitted outside the tube column. The impression body is placed between the inner core of the connector and the positioning sleeve. The upper part of the impression body is connected to the inner core of the connector, and the lower end of the impression body can extend out of the positioning sleeve.

2. A novel well bottom detection impression as claimed in claim 1, wherein: The inner side of the end cap edge is threaded to the outer side of the positioning sleeve port, or the end cap edge is connected to the positioning sleeve port by several bolts.

3. A novel well bottom detection impression as claimed in claim 1 or 2, characterized in that: The impression body is connected to the inner core of the connector by a threaded structure, or the inner core of the connector is provided with several annular bosses on its exterior, and the impression body is covered and fixed on the annular bosses.

4. A novel well bottom detection impression as claimed in claim 1, wherein: Several vertical guide rails are provided between the outer side of the mold body and the positioning sleeve. The guide rails are composed of convex strips and grooves, which are respectively provided on the outer side of the mold body and the inner wall of the positioning sleeve.

5. A novel well bottom detection impression as claimed in claim 1, wherein: The connector inner core and the impression body are provided with vertically continuous water eye channels, which are connected to the insertion holes of the connector inner core.

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