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Polycrystalline diamond compact with anti-adhesion properties

A polycrystalline diamond and anti-adhesion technology, which is applied in drilling equipment, earthwork drilling, drill bits, etc., can solve problems such as ineffective control, improve anti-adhesion performance, improve drilling efficiency, and reduce drilling costs Effect

Active Publication Date: 2018-01-26
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the PDC bit, the bagging starts from the accumulation of cuttings on the cutting edge of the composite blade. Although the above method has a certain preventive effect on the formation of the bagging of the entire drill bit, it cannot effectively control the bagging from the initial stage of formation.

Method used

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  • Polycrystalline diamond compact with anti-adhesion properties
  • Polycrystalline diamond compact with anti-adhesion properties
  • Polycrystalline diamond compact with anti-adhesion properties

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Such as figure 1 and figure 2 As shown, the polycrystalline diamond compact with anti-adhesive properties of embodiment 1 includes a cemented carbide substrate 1 and a polycrystalline diamond layer 2 compounded on the cemented carbide substrate 1, at the edge of the polycrystalline diamond layer 2 The surface 3 is provided with a groove structure. In this embodiment, the groove structure includes several radial grooves 41, and the several radial grooves 41 are radially arranged along the radial direction of the blade surface 3 starting from the center of the blade surface 3. The blade face 3 is divided into several sectors. Wherein, the included angle between two adjacent radial grooves 41 is θ﹦10-30°, and the figure shows the situation of θ﹦30°.

[0027] Such as Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, the cross section of the groove can be designed as a rectangle, trapezoid, triangle, arc or other suitable shapes; wherein, the width of the groo...

Embodiment 2

[0029] Such as image 3 and Figure 4 As shown, the polycrystalline diamond composite sheet with anti-adhesion properties of Example 2 is basically the same as Example 1, the difference is that on the basis of Example 1, the groove structure is further optimized, and Example 2 The groove structure in the blade also includes several arc-shaped circumferential grooves 42 communicating with the radial groove 41, and the several circumferential grooves 42 are concentrically distributed with the center of the blade surface 3 as the center. Among them, the circumferential grooves 42 of adjacent sectors are preferably arranged in a staggered manner. Cooperating with the radial grooves 41, the length of the drilling fluid circuitous flow channel can be extended, the storage time of the drilling fluid in the grooves can be extended, and it is beneficial to reduce rock formation. Friction and adhesion between chip and blade surface. Wherein, the distance between two adjacent circumfer...

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Abstract

The invention discloses a polycrystalline diamond composite sheet with anti-adhesion properties, which comprises a cemented carbide substrate and a polycrystalline diamond layer compounded thereon, and a groove structure is arranged on the blade surface of the polycrystalline diamond layer; the groove The groove structure includes several radial grooves arranged radially along the radial direction of the blade surface, which divide the blade surface into several sectors, and several arc-shaped circumferential grooves connected with the radial grooves , a number of circumferential grooves are concentrically distributed with the center of the blade face as the center of a circle, and the circumferential grooves of adjacent sectors are arranged alternately. The polycrystalline diamond composite sheet with anti-adhesion characteristics of the present invention has a large number of grooves on the blade surface, so that the contact area between the cuttings and the blade surface is small, and the adhesion is reduced; drilling fluid can enter the grooves, lubricate On the face of the composite blade, the cuttings can be carried by the drilling fluid out of the bottom of the well, thus avoiding the adhesion and accumulation of the cuttings in front of the composite blade, fundamentally preventing the formation of the bag of PDC bit.

Description

technical field [0001] The invention relates to the technical field of oil and gas drilling tools, in particular to a polycrystalline diamond composite sheet with anti-adhesion properties applied to a PDC drill bit. Background technique [0002] PDC bit (PDC is the abbreviation of Polycrystalline Diamond Compact bit in English, PDC bit is the abbreviation of polycrystalline diamond compact bit), is a drilling tool commonly used in oil and gas drilling and other industries. The PDC bit is roughly composed of a bit body, cutting teeth, nozzles, and chip flutes. The PDC bit cuts the formation by cutting the cutting teeth installed on the bit body. ) as a cutting element is the core of the cutting tooth. The composite sheet is generally in the shape of a disc, which is composed of a cemented carbide substrate (usually tungsten carbide) as a substrate and a polycrystalline diamond layer. The front of the polycrystalline diamond layer is used as The cutting face of the composite ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B10/46
Inventor 黄勇朱丽红邹德永王京印陈修平于金平王滨孟祥雨
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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