Some standard content:
SY5415-91, Petroleum and Natural Gas Industry Standard of the People's Republic of China
Method for assessing wear of roller drill bits
Published on January 15, 1992
Ministry of Energy of the People's Republic of China
Implementation on July 1, 1992
1 Subject content and applicable scope
Method for assessing wear of roller drill bits in the Petroleum and Natural Gas Industry Standard of the People's Republic of China
This standard specifies the wear categories and classifications, characteristics and codes, measurement methods and descriptions of roller drill bits. This standard applies to the wear classification of roller drill bits for petroleum drilling. Wear categories and classifications
2.1 Tooth wear
SY 541591
For the tooth wear of milled tooth drill bits and forged tooth drill bits, the wear degree of the drill bit teeth is described by the value of the ratio of the tooth height wear of the old drill bit to the new drill bit and the ratio of the total number of teeth. 2.1.1 Milling tooth drill bit: The grading basis is the ratio of the height of the tooth worn away to the height of the new tooth. The tooth height wear ratio is calculated according to formula (1):
C, =8(,)/f,
where Ci---tooth height wear ratio
Hi---the average number of new drill bit teeth in the row corresponding to the worn gear, mm!H--the arithmetic mean of the height of the benzene row teeth on the most severely worn gear, mm. (1)
2.1.2 Inserted tooth drill bit: The grading basis is the ratio of the total number of teeth that have fallen off or broken on the old drill bit to the total number of teeth on the new drill bit (excluding the back cone teeth). The ratio of the total number of teeth that have fallen off or broken off is calculated according to formula (2): C2=8N2/N1
Formula: C is the ratio of the total number of teeth that have fallen off or broken off. 2 is the number of teeth missing from the old drill bit, pieces, and Wr is the total number of teeth on the new drill bit, pieces.
2.1.3 Tooth wear classification: Tooth wear is divided into 8 levels, see Table 1. Table 1
Tooth height wear ratio
(Ratio of the number of teeth that have fallen off or broken off)
Ci or Ca
Tooth wear classification
2.2、Bearing wear
≤2/8
For the wear of rolling and sliding bearings, the ratio of the used bearing life of the old drill bit to the available bearing life of the drill bit is used as the basis for bearing wear classification. The bearing life ratio is calculated according to formula (3) and (4), Z-8T-/T1
Approved by the Ministry of Energy of the People's Republic of China on January 15, 1992 (3)
Implementation on July 1, 1992
Wu Zhong: 7——Bearing life ratio:
$Y 5415—91wwW.bzxz.Net
-The used bearing life under Ns and Ws, h,T
T1Bearing life under Ns and Ws, h
Vs-\—Actual speed of the old drill bit, r/minsRings—Actual drilling pressure of the old drill bit, kN
r-Statistical standard speed, r/minp
-Statistical standard drilling pressure, kN
Tlian—Bearing life calculated under VW parameters, hs—Bearing wear index, see Table 2 for details.
Note: For the statistical method of N, W, and TB, please refer to Appendix A (Supplement). 2.3 Diameter wear
Diameter wear is expressed as an integer in millimeters. ① indicates no wear on the diameter. If the wear number is between two adjacent integers, fill in the larger integer.
Wear characteristics and codes
It means that the used drill bit has obvious changes in appearance compared with the new drill bit, and these changes affect the performance of the drill bit. The wear characteristics are expressed by two Chinese phonetic letters (sometimes a number is added to indicate the number of the gear or nozzle, for example: the 2nd gear is expressed by LK). See Table 3 for wear characteristics and codes.
Annual wear method
4.1 Tooth wear
4.1.1 Milling drill bit: Select a row of teeth on a cone with the most severe tooth wear and measure with a depth vernier caliper or vernier caliper. The method is to insert the main ruler head into the root of the tooth and the end face of the auxiliary ruler close to the tooth top. The read value is the tooth height (tooth height is the vertical height of the tooth top relative to the tooth root). The arithmetic mean of the tooth height of this row and the ratio of the tooth height of the same row of the original new cone are used for grading. 4.1.2 Inserted tooth drill bit: Observe with the naked eye and record the ratio of the total number of teeth that fall off and break on the old drill bit to the total number of teeth on the new drill bit as the grading standard.
4.2 Bearing wear
Bearing wear can be graded according to the life classification and calculated according to formulas (3) and (4). It can also be graded according to the on-site drill bit bearing evaluation table. See Table 4 for details.
Bearing type
Non-sealed
Rolling seal
Sliding seal
Drilling fluid type
Weighted drilling fluid
Sulphonated station fluid
Damage characteristics
Tooth wear
Tooth breakage
Tooth loss
Cone erosion
Cone shoveling
Cone biting
Cone stuck
Dirty wheel rupture
Cone support||t t||Severe damage
Clear
Classification by use time
1/8 of the bearing life has been used
2/8 of the bearing life has been used
3/8 of the bearing life has been used
4/8 of the bearing life has been used
5/8 of the bearing life has been used
6/8 of the bearing life has been used
7/8 of the bearing life has been used
Bearing life is greater than 7/8
Diameter wear
SY 5415--91
Seal bearing
Seal intact, difficult to install with both hands
Seal intact, can be turned with both hands
Seal intact, difficult to turn with one hand
Seal intact, easy to turn with one hand
Seal has problem, bearing loose
Seal failure, serious bearing loose
Bearing complete failure
Destruction characteristics
Cracked palm
Axle seal failure
Thread puncture| |tt||Damage caused by water holes
Erosion and stripping
Erosion and falling
Drill center separation
Drill diameter reduced
Drill mud bag
No major damage characteristics
Deep rolling
Rotation is flexible, bearing is not loose
After rotation, the bearing is basically
Rotation is flexible, with slight play
Axis play is less than 1 torque#
Diameter play is less than 2mm
Axial play is 1.~2mm
Axial play is 2~3 mm
Auxiliary movement is greater than 2m
Radial movement is
Put the drill bit cone upward, put the drill gauge on the largest edge of the outer row of teeth of the three cones, and keep it horizontal. Adjust the opening to make the inner diameter of the drill gauge close to the cone, and then you can read the drill bit diameter. The difference between the new and old drill bit diameters is the wear meter of the drill bit diameter. 5
Wear description format
The wear description format is shown in Table 5.
Tooth wear level
SY 5415—91
Bearing wear level
Diameter grinding temperature
A1Source
SY 5415—91
Appendix A
Statistical method for Ne and WET: in bearing wear calculation formula (4) (supplement)
Use comprehensive recording instrument and drilling parameters to collect the reliable drill data collected by the system or recorded by the test and duty personnel according to regulations.
A2Statistical method
A2.1Spectrum analysis method
In view of the unevenness of the drilling parameters of the drill bit used in the formation, the spectrum analysis method is used to find the relationship curve between the mechanical energy WN (i.e. the product of the drilling pressure W and the rotation speed N) of the drill bit involved in the statistics and the drill bit life T, (i.e. the pure drilling time). With WN value as the horizontal coordinate and T as the vertical coordinate, find the Tb point of each drill bit under the WV value, discard the highest and lowest discrete points, and draw the relationship curve between WV value and T value in the T dense area.
A2.2 Frequency weighting method of hexagonal graph
Use the weighting method on the histogram of W and N of the drill bits involved in the statistics to find the average drilling pressure and average drilling speed N of the statistical drill bits, and find the WN value point on the WN value coordinate. Draw a vertical line through the N value point and intersect with the relationship curve, and draw a vertical line through the intersection point to the vertical coordinate T. The intersection value is the average service life T of the drill bit bearing under the WV value, and I, N, T are the standard drilling pressure WB, standard speed Nn and standard thrust bearing life TB in formula (4).
For example: 50 215.9mm roller drill bits in 20 test wells in a certain area and 7 215.9mm roller drill bits in 3 test wells in another area.9mm roller drill bit data statistics standard drilling pressure W, standard speed VB standard bearing recommended life T=, see Table A1 for details. Table A1
Drill bit diameter
Additional instructions:
Salt head type
X3A- S13G
J22, S84F
Statistical drill bits
Number.
This standard is proposed and managed by the Petroleum Drilling Engineering Professional Standardization Committee. This standard is drafted by the Drilling Technology Research Institute of Shengli Petroleum Administration. The main drafters of this standard are Lv Jinxin and Cong Xiangsheng. W
S84F2 pieces
This standard continues to be effective after the review in 199, and the review result has been approved by the State Petroleum and Chemical Industry Bureau.
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