High-temperature direct-pushing lithologic density instrument

Abstract

The utility model belongs to the technical field of logging instruments, and discloses a high-temperature direct-pushing lithologic density instrument which comprises a main body and a density probe, a containing groove matched with the density probe is formed in the main body, and a plate-shaped spring is further arranged in the containing groove. The device is characterized by also comprising a connecting arm reed and a pressing block, the connecting arm reed is S-shaped, and one end of the connecting arm reed is provided with a tooth groove and a long-strip-shaped hole. The pressing block is provided with a tooth groove and a bolt hole. According to the scheme, the problems that the attaching state of the probe and the well wall is not ideal and the well logging effect is poor due to the fact that a single supporting reed is insufficient in supporting force are effectively solved. According to the scheme, the connecting arm reed is of an S-shaped structure, the single side of the connecting arm reed is open, the connecting arm reed is fully attached to the connecting arm, and the supporting force is evenly released.

Description

Technical Field

[0001] This utility model relates to the field of oil well logging technology, and in particular to a high-temperature direct-drive lithology density instrument for lithology density logging. It can be applied in horizontal well logging and solves the problem of density instruments sticking to the well wall. Background Technology

[0002] Density logging, also known as gamma-gamma logging, refers to the use of Cs-137 as a gamma source, which emits gamma rays with an energy of 0.66 MeV, as an important logging method for determining lithology and rock density. It is combined with sonic logging and neutron logging to form a series of lithological porosity logging methods.

[0003] When performing density logging using logging instruments, to ensure more accurate logging results, the instrument probe typically needs to be placed against the wellbore or against the mud cake on the wellbore. To effectively ensure the probe adheres to the wellbore, patent publication CN 115095291, entitled "A High-Temperature Direct-Push Lithology Density Instrument," discloses a high-temperature direct-push lithology density instrument, comprising a main body and a density probe. The main body has a receiving groove that mates with the density probe. The density probe has an upper connecting arm and a lower connecting arm at its two ends. The upper and lower connecting arms are hinged to the upper and lower connecting bodies via pin holes and pin shafts, respectively. The pin holes are elongated and slide against the pin shaft. A plate spring is also installed inside the receiving groove, with both ends sliding within the groove and the middle of the plate spring engaging with the middle of the density probe.

[0004] However, during use, it was found that in the above structure, the entire probe assembly relies solely on the leaf spring for elasticity, with only one contact point. The two sides are not subjected to force, which may affect the probe's contact effect and lead to deviations in the measurement results. Utility Model Content

[0005] The purpose of this invention is to provide a high-temperature direct-drive lithological density instrument to address the shortcomings of existing technologies.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a high-temperature direct-drive lithological density instrument, comprising a main body and a density probe, wherein the main body is provided with a receiving groove that mates with the density probe, and an upper connecting arm and a lower connecting arm are respectively provided at both ends of the density probe; the upper connecting arm and the lower connecting arm are respectively hinged to the upper connecting body and the lower connecting body through a pin hole and a pin shaft; the pin hole is an elongated hole, and the pin hole and the pin shaft are slidably engaged;

[0007] A plate spring is also installed inside the receiving groove. The two ends of the plate spring are slidably connected inside the receiving groove, and the middle part of the plate spring is matched with the middle part of the density probe.

[0008] The feature is that it further includes a connecting arm spring and a pressure block; the connecting arm spring is S-shaped and has a toothed groove and an elongated hole at one end; the pressure block has a toothed groove and a bolt hole.

[0009] Furthermore, a spring receiving groove is provided on the main body, and the connecting arm spring and the pressure block are fixed in the spring receiving groove by bolts.

[0010] Furthermore: an attitude retainer is also provided on the main body; the attitude retainer is provided with spiral fins, and a misaligned keyway is provided at the end of the attitude retainer; the attitude retainer and the main body are connected by an insertion fit.

[0011] The beneficial effects of this utility model are as follows: This solution effectively solves the problem of insufficient support force of a single support spring (middle part), resulting in an unsatisfactory fit between the probe and the well wall, and poor measurement results. In this solution, the connecting arm spring structure is "S"-shaped, open on one side, fully fits the connecting arm, and releases support force evenly. The "spring mounting waist-shaped groove" and "tooth-shaped key" enable adjustable spring mounting position and secure locking without slippage; the change in mounting position realizes the change of the support point position, making the actual support force on the connecting arm adjustable, ensuring support force and rationality. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0013] Figure 2 yes Figure 1 Enlarged structural diagram at point A;

[0014] Figure 3 This is a schematic diagram of the unfolded structure of the connecting arm spring and the pressure block mating part.

[0015] Explanation of the serial numbers in the diagram:

[0016] 1 is the main body, 2 is the density probe, 3 is the upper connecting arm, 4 is the lower connecting arm, 5 is the pin hole, 6 is the pin shaft, 7 is the upper connecting body, 8 is the lower connecting body, 9 is the plate spring, and 10 is the receiving groove.

[0017] 11 is the connecting arm spring, 12 is the pressure block, 13 is the toothed groove, 14 is the elongated hole, 15 is the bolt hole, 16 is the bolt, and 17 is the spring receiving groove. Detailed Implementation

[0018] Reference Appendix Figure 1-3This utility model provides a high-temperature direct-drive lithological density instrument, including a main body 1 and a density probe 2. The main body is provided with a receiving groove 10 that cooperates with the density probe. The two ends of the density probe are respectively hinged with an upper connecting arm 3 and a lower connecting arm 4. The upper connecting arm and the lower connecting arm are respectively hinged to an upper connecting body 7 and a lower connecting body 8 through pin holes 5 and pin shafts 6. The pin holes are elongated holes, and the pin holes and pin shafts are slidably engaged. A plate spring 9 is also provided inside the receiving groove. The two ends of the plate spring are slidably engaged inside the receiving groove 10, and the middle part of the plate spring cooperates with the middle part of the density probe.

[0019] The system includes a connecting arm spring 11 and a pressure block 12 that respectively mate with the upper and lower connecting arms. The connecting arm spring is approximately "S"-shaped, with a straight lower end having a toothed groove 13 and an elongated hole 14. The upper end is arc-shaped, with the arc portion contacting and engaging with the connecting arm. The pressure block is elongated, with a toothed groove 13 and a bolt hole 15. The toothed grooves on the connecting arm spring and the pressure block are opposite each other and interlock. In use, the two are fastened together and fixed to the main body with bolts. The bolt hole on the pressure block allows it to be positioned in a fixed position on the main body, while the elongated hole on the connecting arm spring allows it to move left and right within a certain range to obtain good support force and support position. The toothed groove ensures both the mobility of the position and the stability of the position after fastening.

[0020] Preferably, a spring receiving groove 17 is provided on the main body, and the connecting arm spring and the pressure block are fixed in the spring receiving groove by bolts 16. The spring receiving groove has a threaded hole that cooperates with the bolts 16.

Claims

1. A high-temperature direct-push litho-density instrument, comprising a main body and a density probe, a containing groove matched with the density probe is arranged on the main body, upper and lower connecting arms are arranged at two ends of the density probe respectively; the upper and lower connecting arms are hingedly connected with upper and lower connecting bodies through pin holes and pin shafts respectively; the pin holes are long holes, and the pin holes and the pin shafts are in sliding fit; a plate spring is further arranged inside the containing groove, two ends of the plate spring are slidingly connected inside the containing groove, and a middle part of the plate spring is matched with a middle part of the density probe; characterized in that the high-temperature direct-push litho-density instrument further comprises a connecting arm spring leaf and a pressing block; the connecting arm spring leaf is S-shaped, and one end of the connecting arm spring leaf is provided with a tooth groove and a long hole; the pressing block is provided with a tooth groove and a bolt hole.

2. A high temperature, direct push litho-density instrument according to claim 1, wherein: A spring leaf containing groove is arranged on the main body, and the connecting arm spring leaf and the pressing block are fixed in the spring leaf containing groove through bolts.

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