Logging instrument mandrel connecting mechanism

Abstract

The utility model discloses a logging instrument core shaft connecting mechanism which comprises a core shaft body, a probe upper connector is arranged at the front end of the core shaft body, a core shaft lower connector is arranged at the rear end of the core shaft body, a probe shell is arranged on the outer side of the core shaft body, and a connecting screw is connected between the core shaft body and the core shaft lower connector in a threaded mode. According to the logging instrument mandrel connecting mechanism, under the condition that the double sensing probes are subjected to tension or impact force, the mandrel body and the probe shell are stressed together under the action of the upper end threaded ring and the lower end threaded ring, the requirement for greatly increasing the tensile strength of the instrument under the same material condition is met, and the tensile strength of the instrument is increased by changing the connecting mode; through the combination that the mandrel body and the probe shell bear tensile force together, an instrument can normally complete a well logging task in direct-push type and pump-out type well logging operation, part of tensile force borne in the well logging process is shared through the probe shell, and the mandrel body is effectively protected against damage in the well logging process.

Description

Technical Field

[0001] The utility model relates to the technical field of well logging instrument structure design, in particular to a well logging instrument core shaft connection mechanism. Background Art

[0002] With the development of oil logging technology, logging depth is increasing, formations are becoming more complex, construction conditions are becoming more severe, and a large number of new logging construction methods are gradually emerging. With the promotion and popularization of direct push and pump-out logging, the tensile strength of the original dual-induction probe can no longer meet the construction requirements.

[0003] For example, a downhole probe waterproof connection structure with application number: CN202223370204.3 includes a probe body and a probe socket, the tail of the probe body is sealed and positioned with a rear sealing connection seat, a connection mounting seat is positioned and installed on the rear sealing connection seat, a plug seat is positioned in the middle of the connection mounting seat, a waterproof plug is integrally connected to the middle of the plug seat, the position of the waterproof plug connects the probe socket and the plug fastening cap, the probe socket is electrically connected with a cable waterproof connector, the position between the plug fastening cap and the waterproof plug is sealed and positioned with a resin waterproof sealing seat, and the cable waterproof connector is connected with a communication cable. The downhole probe waterproof connection structure described in this patent correctly inserts the waterproof plug at one end of the cable into the probe socket, and fixes the plug fastening cap to the probe tightly, and tightens it with a wrench, with excellent waterproof sealing performance and tight connection.

[0004] According to the design principle of the dual-induction logging instrument, its core shaft and the outer shell covering the core shaft cannot use metal structural parts. The limitation of the core shaft and shell materials greatly affects the upper limit of the tensile strength of the instrument. The existing probe connection method cannot solve the problem that the tensile strength of the dual-induction probe does not meet the construction conditions. During the pump-out logging process, the core shaft is often pulled off and the lower half of the instrument falls into the well.

[0005] Most of the existing dual-induction probe connection structures use a core shaft as the connecting body or a probe shell as the connecting body. The probe shell is sleeved on the probe without any connection between the joint and the piston shaft. At the same time, the piston shaft is not connected to the core shaft, which reduces the tensile strength of the dual-induction probe to a certain extent.

[0006] Therefore, we propose a logging tool mandrel connection mechanism to solve the above-mentioned problems. Utility Model Content

[0007] The purpose of the utility model is to provide a logging instrument core shaft connection mechanism to solve the problem that the probe connection method proposed in the above-mentioned background technology cannot solve the situation that the tensile strength of the dual-induction probe does not meet the construction conditions, and the core shaft is often pulled off and the lower half of the instrument falls into the well during the pump-out logging process.

[0008] To achieve the above object, the utility model provides the following technical solutions: a well logging instrument mandrel connection mechanism, comprising a mandrel body, a probe upper joint is arranged at the front end of the mandrel body, and a mandrel lower joint is arranged at the rear end of the mandrel body;

[0009] A probe housing, wherein the probe housing is arranged outside the mandrel body;

[0010] A connecting screw is threadedly connected between the mandrel body and the mandrel lower joint.

[0011] Furthermore, the front end of the mandrel body is connected to the upper joint of the probe via a connecting screw, and the mandrel body is arranged on the inner side of the rear end of the upper joint of the probe.

[0012] Furthermore, the rear end of the core shaft body is connected to the core shaft lower joint through a connecting screw, and the core shaft body is located on the inner side of the front end of the core shaft lower joint.

[0013] Furthermore, an upper threaded ring is threadedly connected to the inner side of the front end of the probe housing, and a lower threaded ring is threadedly connected to the inner side of the rear end of the probe housing.

[0014] Furthermore, the outer end of the upper threaded ring is threadedly connected to the upper joint of the probe, and the rear end of the lower threaded ring is threadedly connected to the piston shaft.

[0015] Furthermore, the probe housing is connected to the probe upper joint via an upper threaded ring, and the probe housing is connected to the piston shaft via a lower threaded ring.

[0016] Furthermore, the lower end threaded ring is installed on the piston shaft and is threadedly connected to the core shaft body through its own threaded structure.

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] 1. When the dual-sensing probe is subjected to tension or impact, the upper threaded ring and the lower threaded ring cause the mandrel body and the probe shell to bear force together, thereby greatly increasing the tensile strength of the instrument under the same material conditions;

[0019] 2. The tensile strength of the instrument is increased by changing the connection mode. The core shaft body and the probe shell bear the tensile force together, so that the instrument can normally complete the logging task in direct push and pump-out logging operations;

[0020] 3. The probe shell shares part of the tensile force during logging, effectively protecting the mandrel body from damage during logging;

[0021] 4. The lower threaded ring and the upper threaded ring are connected to the mandrel body and the probe housing at the same time through their own threaded structures. The threaded connection improves the stability of the equipment connection to a certain extent and facilitates subsequent disassembly;

[0022] 5. The mandrel body is connected to the upper joint of the probe and the lower joint of the mandrel through connecting screws, which further improves the stability of the connection between the mandrel body, the upper joint of the probe and the lower joint of the mandrel, so that the three can withstand tension at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the three-dimensional structure of the probe housing of the utility model;

[0024] Figure 2 This is a schematic diagram of the three-dimensional cross-sectional structure of the utility model;

[0025] Figure 3 This is a schematic diagram of the three-dimensional structure of the mandrel lower joint of the utility model;

[0026] Figure 4 This is a schematic diagram of the three-dimensional structure of the piston shaft of the utility model;

[0027] Figure 5 This is a schematic diagram of the three-dimensional structure of the upper connector of the probe of the utility model;

[0028] Figure 6 This is a schematic diagram of the three-dimensional cross-sectional structure of the lower end threaded ring of the utility model;

[0029] Figure 7 It is a front sectional structural schematic diagram of the utility model.

[0030] In the figure: 1. probe upper joint; 2. spindle body; 3. connecting screw; 4. spindle lower joint; 5. upper end threaded ring; 6. lower end threaded ring; 7. probe housing; 8. piston shaft. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] Embodiment 1: Figure 1 , Figure 4 , Figure 5 and Figure 7The technical solution shown in the figure, the utility model provides the following technical solution: a logging instrument mandrel connection mechanism, discloses a probe housing 7, through which the probe housing 7 and the mandrel body 2 can be jointly stressed, so as to achieve the requirement of greatly increasing the tensile strength of the instrument under the same material conditions:

[0033] A mandrel body 2, wherein the front end of the mandrel body 2 is provided with a probe upper joint 1, and the rear end of the mandrel body 2 is provided with a mandrel lower joint 4;

[0034] The probe housing 7 is connected to the probe upper joint 1 through the upper threaded ring 5, and the probe housing 7 is connected to the piston shaft 8 through the lower threaded ring 6. The lower threaded ring 6 is installed on the piston shaft 8 and is threadedly connected to the core shaft body 2 through its own threaded structure.

[0035] When the dual-sensing probe is subjected to tension or impact, the upper threaded ring 5 and the lower threaded ring 6 cause the mandrel body 2 and the probe housing 7 to be subjected to force together, thereby achieving the requirement of greatly increasing the tensile strength of the instrument under the same material conditions;

[0036] The mandrel body 2 is connected to the probe upper joint 1 and the mandrel lower joint 4 through the connecting screws 3, which further improves the stability of the connection between the mandrel body 2, the probe upper joint 1 and the mandrel lower joint 4, so that the three can withstand tension at the same time.

[0037] Embodiment 2: Figure 2 , Figure 4 and Figure 6 The technical solution shown in the figure, the utility model provides the following technical solution: a well logging instrument mandrel connection mechanism, discloses an upper threaded ring 5 and a lower threaded ring 6, and changes the connection mode through the upper threaded ring 5 and the lower threaded ring 6, thereby increasing the tensile strength of the instrument:

[0038] A probe housing 7, the probe housing 7 is arranged on the outside of the mandrel body 2, and a connecting screw 3, the connecting screw 3 is threadedly connected between the mandrel body 2 and the mandrel lower joint 4;

[0039] The front end inner side of the probe housing 7 is threadedly connected with an upper threaded ring 5, and the rear end inner side of the probe housing 7 is threadedly connected with a lower threaded ring 6, the outer end of the upper threaded ring 5 is threadedly connected to the probe upper connector 1, and the rear end of the lower threaded ring 6 is threadedly connected with a piston shaft 8.

[0040] The tensile strength of the instrument is increased by changing the connection mode, and the core shaft body 2 and the probe housing 7 are combined to withstand the tensile force, so that the instrument can normally complete the logging task in direct push and pump-out logging operations.

[0041] Embodiment 3: Figure 3 and Figure 7The technical solution shown in the figure, the utility model provides the following technical solution: a well logging instrument mandrel connection mechanism, discloses a mandrel body 2, and performs well logging operation through the mandrel body 2:

[0042] The front end of the mandrel body 2 is connected to the probe upper joint 1 through the connecting screw 3, and the mandrel body 2 is arranged on the inner side of the rear end of the probe upper joint 1, and the rear end of the mandrel body 2 is connected to the mandrel lower joint 4 through the connecting screw 3, and the mandrel body 2 is located on the inner side of the front end of the mandrel lower joint 4;

[0043] The probe housing 7 shares part of the pulling force during logging, effectively protecting the core shaft body 2 from damage during the logging process. The lower threaded ring 6 and the upper threaded ring 5 are connected to the core shaft body 2 and the probe housing 7 at the same time through their own threaded structures. The threaded connection improves the stability of the equipment connection to a certain extent, and facilitates subsequent disassembly.

[0044] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0045] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A well logging tool mandrel connection mechanism, comprising a mandrel body (2), a probe upper joint (1) being arranged at the front end of the mandrel body (2), and a mandrel lower joint (4) being arranged at the rear end of the mandrel body (2); Features: Also includes: A probe housing (7), wherein the probe housing (7) is arranged on the outside of the spindle body (2); A connecting screw (3), wherein the connecting screw (3) is threadedly connected between the spindle body (2) and the spindle lower joint (4).

2. A logging tool mandrel connection mechanism according to claim 1, characterized in that: The front end of the mandrel body (2) is connected to the probe upper joint (1) via a connecting screw (3), and the mandrel body (2) is arranged on the inner side of the rear end of the probe upper joint (1).

3. A logging tool mandrel connection mechanism according to claim 1, characterized in that: The rear end of the spindle body (2) is connected to the spindle lower joint (4) via a connecting screw (3), and the spindle body (2) is located inside the front end of the spindle lower joint (4).

4. A logging tool mandrel connection mechanism according to claim 1, characterized in that: An upper threaded ring (5) is threadedly connected to the inner side of the front end of the probe housing (7), and a lower threaded ring (6) is threadedly connected to the inner side of the rear end of the probe housing (7).

5. A logging tool mandrel connection mechanism according to claim 4, characterized in that: The outer end of the upper threaded ring (5) is threadedly connected to the probe upper joint (1), and the rear end of the lower threaded ring (6) is threadedly connected to the piston shaft (8).

6. A logging tool mandrel connection mechanism according to claim 4, characterized in that: The probe housing (7) is connected to the probe upper joint (1) via an upper threaded ring (5), and the probe housing (7) is connected to the piston shaft (8) via a lower threaded ring (6).

7. A logging tool mandrel connection mechanism according to claim 4, characterized in that: The lower end threaded ring (6) is mounted on the piston shaft (8) and is threadedly connected to the core shaft body (2) via its own threaded structure.

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