Elastic clamping positioning mechanism for inner pipe assembly of rope coring drilling tool

A core drilling tool and assembly ejection technology, which is applied in the direction of extracting undisturbed core devices, earthwork drilling, etc., can solve problems such as reduced efficiency, core tube blockage, and increased drilling costs

Active Publication Date: 2020-09-25
EXPLORATION TECH RES INST OF CHINESE ACADEMY OF GEOLOGICAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When drilling and taking cores in complex formations in ultra-deep scientific drilling, core tubes often become clogged. However, the existing positioning mechanisms for the inner tube assembly of wireline coring tools are generally in the form of ball clamp positioning and bullet clamp positioning. The bullet caliper of the bullet card positioning mechanism adopts a single-point hinged mode, as attached figure 1 As shown, the axial contact surface of the bullet caliper 6 and the bullet stop head 12 is a plane, and when the core is drilled normally, the left and right parts of the bullet caliper 6 can be rotated inwardly to the inside of the core tube 2, and the clamping limit is released, and it is smooth. Salvage the inner drill assembly to the ground; but when the core is blocked, the coring tube 2 is forced to move up, driving the upper end surface 6-1 of the bullet caliper and the stopper head 12 of the bullet caliper to push against each other, and after the bullet caliper 6 loses the turning space Form a rigid structure (as attached figure 2 As shown), the cartridge cannot be recovered, and the inner pipe assembly fails to be salvaged. At this time, the drilling tool in the hole can only be lifted to the surface by comprehensive drilling method, which greatly reduces the use efficiency of the wireline drilling tool. For wireline coring drilling in extra-deep holes, it takes longer to fully lift the drill, and the efficiency decreases more prominently, and the drilling cost increases significantly
Another ball clamp positioning method utilizes the rolling characteristics of the steel ball. Although it can avoid the problem of jacking up when the core is blocked, the force between the positioning steel ball and the outer tube is extremely large, and the outer tube assembly is easy to be blocked by the bullet. The connecting thread of the head and the cartridge chamber swells and cracks, which leads to accidents in the hole. At the same time, the positioning steel ball is easily deformed after being squeezed. After repeated use, the rolling and retracting performance of the steel ball is weakened, which reduces the reliability of salvage.

Method used

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  • Elastic clamping positioning mechanism for inner pipe assembly of rope coring drilling tool
  • Elastic clamping positioning mechanism for inner pipe assembly of rope coring drilling tool
  • Elastic clamping positioning mechanism for inner pipe assembly of rope coring drilling tool

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Embodiment Construction

[0043] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0044] see image 3 , during the normal drilling process of the cable core drilling tool, the inner tube assembly is mounted on the seat ring 13 of the outer tube assembly through the suspension ring 9 embedded between the cartridge holder 4 and the water distribution jacket 10. The invention provides a snap positioning mechanism for the inner tube assembly of a rope core drilling tool, which includes a recovery pipe 2, a snap frame 4, a snap stop block 5, a snap caliper 6, a snap seat 7 and a support plate 8 The upper end of the recovery pipe 2 and the spear head assembly 1 of the inner pipe assembly are hingedly assembled through the elastic cylindrical pin B1, and the cartridge holder 4 is set in the recovery pipe 2, and two spring calipers are symmetrically arranged on the side wall of the recovery pipe to avoid Holes 2-3; the cartridge ho...

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PUM

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Abstract

The invention discloses an elastic clamping positioning mechanism for an inner pipe assembly of a rope coring drilling tool. The elastic clamping positioning mechanism comprises a recovery pipe, an elastic clamping frame, an elastic clamping limiting block, an elastic clamping clamp, an elastic clamping seat and a supporting plate, wherein the recovery pipe is assembled with a fishing head assembly, and the elastic clamping frame is sleeved in the recovery pipe; the elastic clamping limiting block, the elastic clamping clamp, the elastic clamping seat and the supporting plate are arranged in the elastic clamping frame, and the elastic clamping limiting block, the elastic clamping clamp and the supporting plate all comprise two parts which are symmetrical left and right; the left and rightparts of the elastic clamping limiting block are hinged together, an elastic clamping limiting block hinge shaft is mounted on the side wall of the recovery pipe, and the elastic clamping limiting block hinge shaft is further hinged to the left and right parts of the elastic clamping clamp respectively; the left and right parts of the elastic clamping clamp are hinged together, and an elastic clamping clamp hinge shaft is assembled with the elastic clamping seat; the lower end face of the elastic clamping seat is in contact with the supporting plate; and the left and right parts of the supporting plate are hinged together, and a supporting plate hinge shaft is assembled with the elastic clamping frame. According to the elastic clamping positioning mechanism, the top dead structure of the elastic clamping clamp and an elastic clamping retaining head can be released, so that elastic clamping is recovered inwards, and the purpose of smoothly completing the salvage of the inner pipe assembly is achieved.

Description

technical field [0001] The invention relates to a wireline coring drilling tool, in particular to an elastic clamping and positioning mechanism for an inner tube assembly of a wireline coring drilling tool. Background technique [0002] In order to grasp the underground geological situation, people usually adopt the method of drilling and coring to obtain real and reliable underground rock formation data. The wireline coring method has been widely used in various drilling engineering fields such as geological exploration, hydrogeology and engineering investigation due to its advantages of high drilling efficiency, low cost, and fewer drilling accidents. Serialization. [0003] Ultra-deep scientific drilling is a scientific exploration activity for geological research by taking cores from ultra-deep holes and reusing the obtained cores. Heart drilled into craftsmanship. When drilling and taking cores in complex formations in ultra-deep scientific drilling, core tubes often...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B25/02
CPCE21B25/02
Inventor 李鑫淼李宽梁健王志刚李小洋施山山
Owner EXPLORATION TECH RES INST OF CHINESE ACADEMY OF GEOLOGICAL SCI
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