Petroleum logging instrument seeker

Abstract

The utility model provides a petroleum logging instrument seeker which comprises a connecting block, the upper end of which is detachably connected with the lower end of a petroleum logging instrument; the driving shaft is rotationally arranged in the middle of the lower end of the connecting block, a motor is arranged in the connecting block, and an output shaft of the motor is connected with the driving shaft through a coupler; the multiple fixing rings are vertically stacked and connected to the driving shaft in a sleeving mode, the inner walls of the fixing rings are detachably connected with the outer wall of the driving shaft, multiple ball grooves are evenly formed in the outer walls of the fixing rings, and balls are movably arranged in the ball grooves; the conical head is arranged at the lower end of the fixing ring at the lowermost end and is detachably connected with the lower end of the driving shaft. The whole seeker body does not need to be replaced, screws do not need to be screwed, operation is convenient, and time is saved; a protruding well wall and a protruding well hole are dredged through the rotating fixing ring, the ball and the conical head, so that a logging instrument can be driven to enter a well smoothly, cost is saved, meanwhile, operation time is saved, and complex conditions are effectively avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of logging instrument guide heads, and particularly relates to an oil logging instrument guide head. Background Art

[0002] In the process of oil and gas exploration and development, logging is one of the important means to obtain geological data in oil and gas exploration engineering. After drilling is completed, a series of operations such as well flushing, logging, and sidewall coring are usually carried out to obtain formation-related parameters, etc. At present, logging is mainly carried out after the drilling is completed. The logging instrument is sent into the well by a cable, and the logging instrument enters the well by its own gravity and completes the logging task from bottom to top. To facilitate the downward movement of the logging instrument, a guide head is connected to the lower part of the logging instrument through an adapter.

[0003] At present, the conventional guide head of a logging instrument has a structure of a solid circular pipe column with a conical shape at the lower end. For example, in the utility model patent with the publication number CN220248076U, the downward movement of the guide head can be facilitated through the balls on the side wall of the guide head. Further, an assembly groove is opened on the outer side of the guide head body. The first rolling groove in the assembly groove can be used to place steel balls. Then, a retaining cover with a second rolling groove is installed on the assembly groove, so that the balls roll between the first rolling groove and the second rolling groove. Moreover, when the balls are damaged, they can be disassembled and replaced according to the position of the worn and damaged balls, without replacing the entire guide head body part. However, during the process of replacing the balls, a relatively large number of bolts need to be screwed, resulting in inconvenient disassembly and assembly. And in this patent, there are no movable parts on the guide head. If the well deviation angle of the wellbore is too large, the wellbore diameter is reduced, or the wellbore is irregular to form a step, the logging instrument cannot smoothly enter the well, and it is necessary to carry out well flushing and repeated treatment of drilling fluid many times to facilitate the entry of the logging instrument, which is likely to cause an increase in cost and waste of time, and even more serious complex situations in the well.

[0004] In summary, there is an urgent need to design an oil logging instrument guide head that can overcome the above problems. Summary of the Utility Model

[0005] The purpose of the utility model is to provide an oil logging instrument guide head that can overcome the above problems.

[0006] To achieve the above purpose, the technical solution adopted by the utility model is: an oil logging instrument guide head, comprising:

[0007] A connecting block, the upper end of which is detachably connected to the lower end of the oil logging instrument;

[0008] A driving shaft, which is rotatably arranged in the middle of the lower end of the connecting block. A motor is arranged in the connecting block, and the output shaft of the motor is connected to the driving shaft through a coupling;

[0009] Fixed rings are provided in plurality and are vertically stacked and sleeved on the drive shaft respectively. There is a detachable connection between the inner wall of the fixed ring and the outer wall of the drive shaft. A plurality of ball grooves are evenly formed in the outer wall of the fixed ring, and balls are movably arranged in the ball grooves;

[0010] A conical head is arranged at the lower end of the lowermost fixed ring and is detachably connected to the lower end of the drive shaft.

[0011] The object of the present utility model and the technical problems to be solved thereby can be further realized by adopting the following technical measures.

[0012] Further, a limiting strip parallel to the axis of the drive shaft is arranged on one side wall of the drive shaft. A through groove matching the limiting strip is formed in the inner wall of the fixed ring. The fixed ring and the drive shaft are clamped and connected through the through groove and the limiting strip.

[0013] Further, a threaded hole is formed in the middle of the upper surface of the conical head, and an external thread matching the threaded hole is arranged on the outer wall of the lower end of the drive shaft.

[0014] Further, a cavity is formed inside the connecting block. The motor is installed in the cavity. A through hole for the output shaft of the motor and the drive shaft to pass through is formed in the middle of the bottom wall of the cavity.

[0015] Further, a connecting head is arranged at the upper end of the connecting block, and the connecting head is in threaded connection with the petroleum logging instrument.

[0016] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0017] 1. For a guiding head of a petroleum logging instrument of the present utility model, by arranging a connecting block, a drive shaft, a plurality of fixed rings vertically stacked and sleeved on the drive shaft, and a conical head detachably connected to the lower end of the drive shaft, and evenly arranging grooves on the outer wall of the fixed ring and movably arranging balls in the ball grooves. When a ball is damaged, the conical head is removed, then the fixed ring where the damaged ball is located is taken off the drive shaft, and then a new fixed ring is replaced. There is no need to replace the whole guiding head body, and there is no need to screw the screws, which is convenient to operate and saves time.

[0018] 2. A guide head for a petroleum logging instrument of the present utility model. By arranging a motor and a drive shaft, stacking and fixedly sleeving a fixing ring on the drive shaft, and installing a conical head at the lower end of the drive shaft, if the well deviation angle of the wellbore is too large, the wellbore wall is reduced in diameter, or the wellbore is irregular to form a step, the motor is turned on to drive the drive shaft to drive the fixing ring and the conical head to rotate. The protruding wellbore wall and wellbore are dredged through the rotating fixing ring, balls and conical head, so that the logging instrument can be smoothly lowered into the well, without multiple reaming and repeated treatment of drilling fluid, saving costs and operation time, and effectively avoiding the occurrence of complex situations. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 FIG. is a schematic front sectional structure view of the guide head for a petroleum logging instrument provided by the present utility model;

[0020] Figure 2 is Figure 1 an enlarged schematic view of part A in ;

[0021] Description of the reference numerals in the drawings:

[0022] 1. Connecting block; 11. Cavity; 12. Through hole; 13. Connecting head;

[0023] 2. Drive shaft; 21. Motor; 22. Limiting strip; 23. External thread;

[0024] 3. Fixing ring; 31. Ball groove; 32. Through groove;

[0025] 4. Balls;

[0026] 5. Conical head; 51. Through groove. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] In order to make the objectives, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0028] Please refer to Figures 1 to 2 , a guide head for a petroleum logging instrument, comprising:

[0029] A connecting block 1, the upper end of which is detachably connected to the lower end of the petroleum logging instrument;

[0030] A drive shaft 2, which is rotatably arranged in the middle of the lower end of the connecting block 1. A motor 21 is arranged in the connecting block 1, and the output shaft of the motor 21 is connected to the drive shaft 2 through a coupling;

[0031] A fixed ring 3, a plurality of which are provided and vertically stacked and sleeved on the driving shaft 2 respectively. A detachable connection is provided between the inner wall of the fixed ring 3 and the outer wall of the driving shaft 2. A plurality of ball grooves 31 are evenly formed in the outer wall of the fixed ring 3, and balls 4 are movably arranged in the ball grooves 31; a plurality of fixed rings 3 are vertically stacked to form a cylindrical pipe column, and there are at least 3 fixed rings 3;

[0032] A conical head 5 is arranged at the lower end of the lowermost fixed ring 3 and is detachably connected to the lower end of the driving shaft 2.

[0033] In the utility model, when a ball is damaged, first remove the conical head 5, then remove the fixed ring 3 where the damaged ball is located from the driving shaft 2, and then replace it with a new fixed ring 3. There is no need to replace the entire seeker body, and there is no need to screw the screws. The operation is convenient and time-saving; if the well deviation angle of the wellbore is too large, the wellbore wall is reduced in diameter or the wellbore is irregular to form a step, start the motor 21 to drive the driving shaft 2 to drive the fixed ring 3 and the conical head 5 to rotate, and dredge the protruding wellbore wall and wellbore through the rotating fixed ring 3, balls 4 and conical head 5, so as to drive the logging instrument to smoothly enter the well. There is no need to conduct multiple well flushing and repeated treatment of drilling fluid, which saves costs, saves operation time at the same time, and effectively avoids the occurrence of complex situations.

[0034] Preferably, a limiting strip 22 parallel to the axis of the driving shaft 2 is provided on one side wall of the driving shaft 2. A through groove 32 matching the limiting strip 22 is formed in the inner wall of the fixed ring 3. The fixed ring 3 and the driving shaft 2 are clamped and connected through the through groove 32 and the limiting strip 22, so as to prevent relative rotation between the fixed ring 3 and the driving shaft 2. Combined with the conical head 5 fixedly connected to the lower end of the driving shaft 2, the up-and-down sliding of the fixed ring 3 relative to the driving shaft 2 can be restricted, so as to fix the fixed ring 3 on the driving shaft 2 and enable the driving shaft 2 to drive the fixed ring 3 to rotate. Fix.

[0035] Preferably, a threaded hole 51 is formed in the middle of the upper surface of the conical head 5, and an external thread 23 matching the threaded hole 51 is provided on the outer wall of the lower end of the driving shaft 2. It should be noted that the thread direction of the external thread 23 is the same as the rotation direction of the motor 21, that is, when the motor 21 drives the driving shaft 2 to rotate and there is friction between the conical head 5 and the wellbore, the conical head 5 will not rotate relative to the driving shaft 2.

[0036] Preferably, a cavity 11 is formed inside the connecting block 1, the motor 21 is installed in the cavity 11, and a through hole 12 for the output shaft of the motor 21 and the driving shaft 2 to pass through is formed in the middle of the bottom wall of the cavity 11.

[0037] Preferably, a connection head 13 is provided at the upper end of the connection block 1, and the connection head 13 is threadedly connected to the petroleum logging instrument. The specific connection manner between the connection head 13 and the petroleum logging instrument belongs to the prior art and will not be elaborated here. It should be noted that the connection block 1 is a disc, and its outer diameter is the same as that of the fixed ring 3.

[0038] The above has further described the present invention in conjunction with the embodiments, but the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art, various changes can also be made without departing from the gist of the present invention.

Claims

1. A guiding head of a petroleum logging instrument, characterized in that It includes: A connecting block (1), the upper end of which is detachably connected to the lower end of the petroleum logging instrument; A driving shaft (2), which is rotatably arranged in the middle of the lower end of the connecting block (1). A motor (21) is arranged in the connecting block (1), and the output shaft of the motor (21) is connected to the driving shaft (2) through a coupling; A plurality of fixing rings (3), which are respectively vertically stacked and sleeved on the driving shaft (2). The inner wall of the fixing ring (3) is detachably connected to the outer wall of the driving shaft (2). A plurality of ball grooves (31) are evenly formed on the outer wall of the fixing ring (3), and balls (4) are movably arranged in the ball grooves (31); A conical head (5), which is arranged at the lower end of the lowermost fixing ring (3) and is detachably connected to the lower end of the driving shaft (2).

2. The seeker of an oil logging instrument according to claim 1, characterized in that, A limiting strip (22) parallel to its axis is arranged on one side wall of the driving shaft (2). A through groove (32) matching the limiting strip (22) is formed on the inner wall of the fixing ring (3), and the fixing ring (3) and the driving shaft (2) are clamped and connected through the through groove (32) and the limiting strip (22).

3. The seeker of an oil logging instrument according to claim 1, characterized in that A threaded hole (51) is formed in the middle of the upper surface of the conical head (5), and an external thread (23) matching the threaded hole (51) is arranged on the outer wall of the lower end of the driving shaft (2).

4. The seeker of an oil logging instrument according to claim 1, characterized in that, A cavity (11) is formed inside the connecting block (1), the motor (21) is installed in the cavity (11), and a through hole (12) for the output shaft of the motor (21) and the driving shaft (2) to pass through is formed in the middle of the bottom wall of the cavity (11).

5. A seeker for a petroleum logging instrument according to claim 1, characterized in that, A connecting head (13) is arranged at the upper end of the connecting block (1), and the connecting head (13) is threadedly connected to the petroleum logging instrument.

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