CN-122014116-A - Reamer blade while drilling and blade mechanism

CN122014116ACN 122014116 ACN122014116 ACN 122014116ACN-122014116-A

Abstract

The invention discloses a reamer blade while drilling and a blade mechanism. The cutter blade comprises a cutter blade body and cutting elements arranged on the cutter blade body, wherein the cutter blade body comprises two crown surfaces and inclined chute track crown surfaces arranged on two sides of the two crown surfaces, the inclined chute track crown surfaces comprise an upper crown surface, a lower crown surface and diameter-keeping blocks, the crown shape of the upper crown surface and the crown shape of the lower crown surface are asymmetric crown shapes, the length of the upper crown surface is larger than that of the lower crown surface, the lengths of the upper crown surface and the lower crown surface are in a first proportion, the minimum curvature of the upper crown surface is smaller than the maximum curvature of the lower crown surface, the upper crown surface is connected with the lower crown surface through the diameter-keeping blocks, the upper crown surface and the lower crown surface comprise cambered surfaces with gradually changing curvatures, the cutting elements comprise at least two cutting teeth and at least two diameter-keeping teeth, the cutting teeth are arranged on the upper crown surface and the lower crown surface, the diameter-keeping teeth are arranged on the diameter-keeping blocks, and the cutting teeth and the diameter-keeping teeth are arranged on the two crown surfaces in a staggered mode. The cutting force and the cutting area of the blade can be improved, the abrasion loss of the blade is reduced, and the service life is prolonged.

Inventors

GUAN NING
LUO YONG
ZHANG YANPING
XU BINGGUI
HOU FUXIANG
HE KUN
CAO CHUAN
WANG JUN
LIANG GUOHONG

Assignees

中国石油天然气集团有限公司
中国石油集团工程技术研究院有限公司

Dates

Publication Date: 20260512
Application Date: 20241112

Claims (11)

1. The reamer blade while drilling is characterized by comprising a blade body and cutting elements arranged on the blade body; The blade body comprises two crown surfaces and inclined chute tracks arranged on two sides of the two crown surfaces; The crown surface comprises an upper crown surface, a lower crown surface and a gauge protection block, the crowns of the upper crown surface and the lower crown surface are asymmetric crowns, the length of the upper crown surface is larger than that of the lower crown surface, the lengths of the upper crown surface and the lower crown surface are in a first proportion, the minimum curvature of the upper crown surface is smaller than the maximum curvature of the lower crown surface, and the upper crown surface is connected with the lower crown surface through the gauge protection block; The upper crown surface and the lower crown surface comprise cambered surfaces with different curvatures; the cutting element comprises at least two cutting teeth and at least two gage teeth, the cutting teeth are arranged on an upper crown surface and a lower crown surface, and the gage teeth are arranged on a gage block; The cutting teeth and the gauge protection teeth are arranged on the two crown surfaces in a staggered mode.
2. The blade of claim 1, wherein the upper crown is for forward reaming and the lower crown is for reverse reaming; The length of the gauge block is smaller than that of the upper crown surface. The inclined chute track is used for being matched and connected with the reamer.
3. The blade of claim 1, wherein the arcuate curvature of the upper crown surface decreases in a direction away from the gage block and the arcuate curvature of the lower crown surface increases in a direction away from the gage block.
4. The blade of claim 1, wherein the cutting teeth comprise a base and a tooth tip, and the tooth tips of the cutting teeth arranged on the two crown surfaces in a staggered manner face the same direction; the diameter of each cutting tooth is the same, the length of each cutting tooth is different, and the length of each cutting tooth is smaller than the width of the crown.
5. The blade of claim 1, wherein the cutting teeth are of relief design and have a back rake angle of 0 ° to 20 °.
6. The blade of claim 1, wherein the cutting teeth have a center of tooth radius that gradually increases from a first tooth to a last tooth, and a center of tooth height that gradually decreases from the first tooth to the last tooth, with the cutting tooth adjacent the gage block being the first cutting tooth.
7. The blade of claim 4, wherein the tooth center radius is 88mm to 115mm and the tooth center height is 1mm to 152mm.
8. The blade of claim 1, wherein the gage teeth comprise spherical teeth, semi-dome teeth, and impregnated teeth, the gage teeth cutting or not cutting the surface of the earth formation.
9. The blade of claim 1, wherein the blade further comprises a chip carrying slot; the chip carrying groove is arranged between the first crown surface and the second crown surface and is used for carrying rock chips generated during the working of the cutting teeth to flow out smoothly.
10. A cutter wing mechanism is characterized by comprising the cutter wings of the reamer while drilling according to any one of claims 1-9 with different structures; the blades of the reamer with different structures are connected with the reamer through the inclined sliding grooves; when the reamer is connected with the reamer, the axial equal heights of the reamer blades with different structures are uniformly distributed.
11. The blade mechanism of claim 10, wherein the different structures are represented by: the curvature of the crown surface of each blade is different; the number of cutting elements on each blade is different; the radius of the tooth center of the cutting tooth on each blade is different; the tooth center of the cutting teeth on each blade is different in height.

Description

Reamer blade while drilling and blade mechanism Technical Field The invention belongs to the technical field of petroleum and natural gas drilling, and particularly relates to a reamer blade while drilling and a blade mechanism. Background Along with the continuous progress of oil and gas resource exploration and development to deep and ultra-deep layers, deep wells and ultra-deep wells face the problems that well structures are complex, annular gaps of casings are small, well cementation quality is difficult to guarantee and the like, the size of a well bore is enlarged by adopting a reaming while drilling technology, and the well structure is optimized. Because the stratum layers of the ultra-deep well are increased, faults alternate with creep stratum, the geological characteristics of the ultra-deep well are complex, the existing reaming tool faces the conditions of high compaction degree of deep stratum rock and staggered hardness of stratum in the drilling process, the problems of large torque fluctuation, poor drillability and the like of the reaming tool can be caused when the hard stratum is drilled, and the reamer blades can be worn out, tooth dropping and tooth collapse too fast. Disclosure of Invention The soft and hard staggered characteristic of the deep stratum makes the cutter wings of the prior reamer easily wear and have unbalanced cutting force in the working process, so that the problems of short service life and quick failure of the cutter wings are caused, in addition, the cutting force and the cutting area of the prior cutter wings are small when the prior cutter wings drill into the deep stratum, the working efficiency is low, the cutter blade can not meet the requirements of hard stratum reaming operation in soft and hard staggered stratum, so that the cutter blade for different stratum reaming operations is required to be provided, the abrasion loss of the cutter blade of the reamer in the drilling process is reduced, the cutting force and the service life of the cutter blade are improved, the cutting area is increased, and the underground reaming working efficiency is improved. The present invention has been made in view of the above problems, and it is an object of the present invention to provide a reamer blade that overcomes or at least partially solves the above problems. In a first aspect, embodiments of the present invention provide a reamer blade while drilling, comprising a blade body and cutting elements disposed on the blade body; The blade body comprises two crown surfaces and inclined chute tracks arranged on two sides of the two crown surfaces; The crown surface comprises an upper crown surface, a lower crown surface and a gauge protection block, the crowns of the upper crown surface and the lower crown surface are asymmetric crowns, the length of the upper crown surface is larger than that of the lower crown surface, the lengths of the upper crown surface and the lower crown surface are in a first proportion, the minimum curvature of the upper crown surface is smaller than the maximum curvature of the lower crown surface, and the upper crown surface is connected with the lower crown surface through the gauge protection block; the upper crown surface and the lower crown surface comprise cambered surfaces with different curvatures; the cutting element comprises at least two cutting teeth and at least two gage teeth, the cutting teeth are arranged on the upper crown surface and the lower crown surface, and the gage teeth are arranged on the gage blocks; The cutting teeth and the gauge protection teeth are arranged on the two crown surfaces in a staggered manner. In some alternative embodiments, the upper crown is used for forward reaming and the lower crown is used for reverse reaming; the length of the gauge block is less than the upper crown surface. The inclined chute track is used for being matched and connected with the reamer. In some alternative embodiments, the arcuate curvature of the upper crown surface tapers in a direction away from the gage block and the arcuate curvature of the lower crown surface tapers in a direction away from the gage block. In some alternative embodiments, the cutting teeth comprise a base and tooth tips, and the tooth tips of the cutting teeth arranged on the two crowns in a staggered manner face the same direction; the diameter of each cutting tooth is the same, the length of each cutting tooth is different, and the length of each cutting tooth is smaller than the width of the crown. In some alternative embodiments the cutting teeth are of a relief design, with a back rake angle of 0 ° to 20 °. In some alternative embodiments, the tooth center radius of the cutting tooth increases gradually from the first to the last, and the tooth center height decreases gradually from the first to the last, so that the cutting tooth near the gage block is the first cutting tooth. In some alternative embodiments, the tooth center radius is 88mm to 1