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Stepped composite reaming and rock waste removal tool

A removal tool, stepped technology, used in drilling equipment, earthwork drilling, drill bits, etc., can solve problems such as affecting the reaming effect, forming mud bags with reaming tools, and well wall collapse.

Inactive Publication Date: 2020-03-24
CNPC DRILLING RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The following problems are often encountered in the process of hole reaming. First, cuttings beds are prone to appear in extended-reach well sections; The formation is easy to form mud packs on the reaming tool, which affects the reaming effect

Method used

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  • Stepped composite reaming and rock waste removal tool
  • Stepped composite reaming and rock waste removal tool
  • Stepped composite reaming and rock waste removal tool

Examples

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Embodiment Construction

[0019] The following is a clear and complete description of the stepped compound reaming and cuttings removal tool in conjunction with the three accompanying drawings of the present invention.

[0020] refer to figure 1 .The step-type compound hole reaming and debris removal tool of the present invention mainly includes (1) water eye, (2) cone reamer, (3) reamer; the (2) cone reamer is located in the tool The upper part is composed of 4 (7) reaming tools, which are evenly distributed around the pipe string, and fixed on the (8) tool holder by (17) bolts. The (7) reaming tools are made of tungsten carbide material, The bolts can be loosened and replaced; during the rotation of the drill string, the 4 (7) reaming tools are constantly rotating to cut and break the formation, and 4 evenly distributed can slow down the wear of each (9) cutting teeth degree, increase the service life, and can play the role of a centralizer to prevent the well deviation, and the use of the roller re...

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Abstract

The invention discloses a stepped composite reaming and rock waste removal tool which is a common tool in petroleum drilling and is particularly suitable for reaming and rock waste removal of a horizontal well and a large displacement well. When the horizontal well and the large displacement well are drilled, the situations that the rock waste of a horizontal section is difficult to remove and sometimes the driller encounters with a large section of gravel layer and an evaporite bed commonly exist, and the phenomena that the well wall is unstable and shrinks also exist. Therefore, the steppedcomposite reaming and rock waste removal tool is designed and mainly comprises a drill column body, a hydrophthalmia, a cone underreamer and a reamer underreamer, wherein the external diameter of thereamer underreamer is greater than that of the cone underreamer; the stepped composite reaming and rock waste removal tool is connected into a drill column through upper and lower threads and rotatesalong with rotation of the drill column, during the rotating process, the reaming cutter of the cone underreamer rotates to break rock, the hydrophthalmia at the lower part of the reaming cutter ejects high-pressure drilling fluid to flush the cutter; and when the cutter with a smaller diameter finishes reaming, the upper reamer underreamer with a larger diameter reams for a second time and trimsthe well wall to realize the purpose of removing the rock waste.

Description

technical field [0001] The invention relates to the technical field of reaming tools, in particular to a stepped compound reaming and debris removal tool. Background technique [0002] With the continuous development of unconventional oil and gas resources, the depth of drilling is getting deeper and deeper, and the well type is becoming more and more complex. There are more and more complexities in the drilling process, and the need for hole reaming is often encountered. [0003] The following problems are often encountered in the process of hole reaming. First, cuttings beds are prone to appear in extended-reach well sections; The formation is easy to form mud bag on the reaming tool, which affects the reaming effect. [0004] Based on this, the present invention designs a step-type compound reaming and cuttings removal tool to solve the above problems. Contents of the invention [0005] The present invention is to provide a step-type compound hole reaming and cuttings...

Claims

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Application Information

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IPC IPC(8): E21B10/26E21B10/28E21B10/60E21B10/62
CPCE21B10/26E21B10/28E21B10/60E21B10/62
Inventor 惠城彭晓龙任威严汪海阁邹灵战卓鲁斌于璟常龙
Owner CNPC DRILLING RES INST
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