This standard specifies the thread type, basic dimensions, tolerances and markings of digital (NC), internal flat (IF), through-hole (FH), and regular (REG) oil drill pipe joint threads (i.e., shoulder connection threads, referred to as threads). Since the thread type and taper of digital threads are more reasonable than those of internal flat, through-hole and regular threads, it is recommended to use digital threads when designing new products. This standard applies to the connection between downhole tools and drill stem components. GB/T 9253.1-1999 Oil Drill Pipe Joint Threads GB/T9253.1-1999 Standard download decompression password: www.bzxz.net

GB/T9253.1--1999
This standard is revised on the basis of the original GB/T9253.1-1988 and with reference to the 39th edition of API Spec7 "Specification for Rotary Drilling Drill String Components". Compared with the original national standard, the terminology has been greatly revised and new codes have been added. NC10~NC16 small pipe column connection threads have been added to the standard text, and the illustrations in the standard have been greatly changed according to my country's mechanical drawings. The code of thread parameters has been changed to be completely consistent with the American Petroleum Institute, and the internal thread major end minor diameter has been added to the basic thread size. The thread profile is listed in a separate chapter, the basic size and tolerance are combined into one chapter, and the deviation of the original tolerance that does not belong to the thread tolerance is moved to the relevant tables and figures, so as to be consistent with the international advanced standards, and the thread flank angle deviation has been adjusted according to the new version of API Spec7. The cumulative pitch deviation has been processed in words according to my country's terminology. The new standard takes the close pitch deviation as the basis for the comprehensive inspection of the workpiece thread. The new standard adds the relationship diagram between the close distance between the calibration gauge and the workpiece thread, and changes the detection benchmark from the benchmark gauge to the calibration plug gauge, so as to coordinate and unify the value transfer at home and abroad. The new standard adds the content of special thread structure, adds a short horizontal line before "LH" for the marking of left-handed threads, and stipulates the interchangeable thread marking. The new standard deletes the relevant dimensional parameters of the stress dispersion groove of the drilling boat and the small pipe column thread in Appendix A and Appendix B of the original national standard. The British size table of thread tooth type is added to the British size of Appendix C of the original national standard.
This standard replaces the original GB/T9253.1-1988 "Oil Drill Pipe Joint Thread" from the date of entry into force. Appendix A of this standard is the appendix of the standard.
This standard is proposed, managed and interpreted by the National Technical Committee for Standardization of Petroleum Drilling and Production Equipment and Tools. The drafting units of this standard are: Baoji Petroleum Machinery Plant and Xi'an Petroleum Pipe Research Institute. The main drafters of this standard are: Quan Dexiang, Li Yitian, Ma Zhonghai, Duan Xufeng, Dong Qiuying186
National Standard of the People's Republic of China
Threads on rotary shouldered connections for petroleum industry1Scope
GB/T 9253. 1-—1999
Replaces GB/T9253.1--1988
This standard specifies the tooth profile, basic dimensions, tolerances and markings of digital type (NC), internal flat type (IF), through-hole type (FH) and regular type (REG) threads for petroleum drill pipe joints (i.e., shoulder connection threads, referred to as threads). Since the tooth profile and taper of digital type threads are more reasonable than those of internal flat type, through-hole type and regular type threads. It is recommended to use digital type threads in the design of new products.
This standard is applicable to well The connection between the lower tool and the drill string component. 2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and the parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T4749-1993 Thread gauge for petroleum drill pipe joints 3 Definitions and symbols
This standard adopts the following definitions.
3.1 Terms
3.1.1 Number (NC) style connection threads use V-0.038R thread profile, and are expressed in inches and tenths of inches of the thread base diameter. Note: NC10-NC16 use V-0.055 thread profile. 3.1.2 Internal-flush (IF) style connection threads use V-0.065 thread profile, and are used for internal flush drill pipe joints. 3.1.3 Full-hole (FH) style connection threads use V-0.040, V-0.050 or V-0.065 thread profile, and are used for full-hole drill pipe joints. 3.1.4 Regular (REG) style connection threads use V-0.040, V-0.050 or V-0.065 thread profile, and are used for full-hole drill pipe joints. Threads adopt V-0.040 or V-0.050 thread type, and the thread used by the regular drill pipe joint. 3.1.5 Standoff
Under the specified conditions, the axial distance between the specified measuring points or surfaces of the screwed internal and external tapered threads. 3.2 Symbol
V-0.038R--The tooth type code with a tooth bottom arc radius of 0.038in-The tooth type code with a tooth bottom arc and a tooth top width of 0.040in is V-0.040 -
V-0.050—tooth profile code with arc bottom and 0.050in crest width V-0.055-
V-0.065--
tooth profile code with flat bottom and 0.055in crest width Flat bottom and 0.065in crest width Approved by the State Administration of Quality and Technical Supervision on May 17, 1999 and implemented on December 1, 1999
H—original triangle height
h. (h.)——internal (external) thread profile height h (ha)——internal (external) thread crest height Nhan (Ahas)-
GB/T 9253. ---1999
Internal (external) thread crest height deviation
Internal (external) thread profile height deviation
Internal (external) thread arc tooth bottom flattening height
Sn(Sh)-
F. (f)—Internal (external) thread flat tooth bottom flattening heightfeno)
Fen(Fe)-
Internal (external) thread crest flattening height
Internal (external) thread crest width
Fn(Frs)-
rn(rr)
Internal (external) thread root width
-Internal (external) thread tooth bottom arc radius
Fillet radius
-base plane median diameter
external thread major end major diameter
external thread root cylindrical diameter
-external thread minor end major diameter
——external thread taper length
-internal thread effective thread length
——internal thread taper length
·internal thread taper hole major end diameter
—internal thread major end minor diameter
internal and external thread chamfer width
matching tightness value of calibration plug gauge and calibration ring gauge interchange tightness value of calibration ring gauge to working plug gauge S interchange tightness value of calibration plug gauge to working ring gauge 4 tooth form
thread tooth form shall comply with the provisions of Figure 1 and Table 1. For inch sizes, see Appendix A Table A1. Thread profile size of petroleum drill pipe joint
Original triangle
Tooth profile code
V-0.038R6.350
V-0. 038R|6.350
16.350]1: 6
Shape height
Tooth profile height
Tooth top flattened
Tooth bottom flat
Srn = srl
! Root width
Top width
Root arc
Corner radius
5 Basic dimensions and tolerances
GB/T9253.1—1999
Thread axis
V-0.038RV-0.040 and V-0.050 thread profilesThread axis
-0.055 and V-0.065 thread profiles
External helix
5.1 The basic dimensions of the thread shall comply with the requirements of Figure 2 and Table 2. For imperial dimensions, see Appendix A, Table A2. 181 GB/T 9253. 1-1999 6 SN9ONN Thread code, thread type (number of threads for 25.4 mm) GB/T 9253. 1-1999 Basic size of thread for petroleum drill pipe joints External thread External thread root, end major diameter Number of diameters (N) V-0. 053 74. 233 (6) [1: 8 27. 000 1 30. 226 NC10 V-0. 053 1 4. 233(6) 11 : 8 32. 131 1 35, 35V.0. 0551. 23366)
11 : 8 35. 331.
350(4)
V-0. 038R
350(1)
6. 350(4)
6.350(4)
4 REGV-0.010
5. 080(5)
5. 080(5)
350（4）
【6.350(4)
6.350(4)1
8% REG V-0. 050
External thread
External thread
Internal thread
Effective thread
Length
Internal thread
Expanded hole
Big end, internal thread
44-1547.63
38117.650
E gauge REG
6.350(4) 1 # 4194.731 | 26.
68. ​​28187.
163. 10 168. 28 180. 98 201. 7881
T 68. 26 61. 423
9.381 92.08
53. 97388. 90192.08 [101.781 77.7 70. 9481 93.2
[111. 13 90. 19
11. 131123. 831119. 061112. 2123. 83136.3111. 681133,63
.039127.0
0. 18/112. 88 153. 9: 115. 6015136.53149.23 180.18171.235
4.473133.35
167.843136.53/139.70152.40201 .38,195.41777.62295.2598.1311.13102.7006.187V-0.040
5.080(5)1 :
114.30117.48/130.1811c.33
V-0. 0656.350(4) 1: 6103. 129108. 712 105. 5689.662
96.317t01.60101.78117. 481123. 83 116. 436V-0.0405.080(5) ,1 : 4|115.113[121.717
6.350(4) 1 : 6
6 FHV-0. 0506.350(4)
11:6165.598/171.526
Inner flat type (IF)
2 Tim IF
S field IF
126.797/127.00 130.18|142.88|150,02141.361
150.368 127. 00130.18/142.88|173. 8316t.9.1
160.350176.20179. 38192 0874.61167.7769.85
I 6. 350(4) 1 : 667. 767 T 73. 05082.9671.32388.9092.08104.7887.7180.8596. 350(4)1 6 | | tt | 96, 734103. 73-114. 301117. 48
6.350(4)|1:6128.059133.350130.421114.300114.30|117.481124. 621117 517
130. 18134. 91[128. 076
1141. 326 127. 00|130.18|142- 88|163. 91 157 21V-0.065G.350(4)1:6157.201162.4841) For NC1CNC16Q., the limit deviation is 0.13mmn, the taper of the expansion hole of all threads and the taper of the thread rod, which can be processed into a straight hole, the minimum and maximum deviation of the thread hole are the same as the large end of the thread hole. 5.2 Tolerance
5.2.1 Pitch limit deviation
GB/T9253.1—1999
The cumulative deviation of the pitch along the axial direction of 25.4mm in any section within the complete thread range is 0.038mm. The cumulative deviation of the pitch in the entire range of the complete thread is ±0.114mm, or calculated as 1/1000 of the total length of the thread, whichever is greater.
Flank angle limit deviation: ±45°.
5.2.3 The limit deviations of tooth profile height and tooth top height shall comply with the provisions of Figure 3 and Table 3. External helix
Thread axis
Thread axis
Figure 3 Limit deviations of tooth profile height and tooth top height
Table 3 Limit deviations of tooth profile height and tooth top height
Tooth top height haxha
Ahan Ah
Note: The limit deviations specified in this table are for reference only when designing thread cutters. Tooth profile h=h,
5.2.4 Within the complete thread range, converted to an axial length of 304.8mm, the limit deviations of the average taper of the thread pitch cone are: External thread: upper deviation is +0.762mm, lower deviation is 0, Internal thread: upper deviation is 0, lower deviation is -0.762mm. 5.2.5 Limit deviation of close distance
In addition to meeting the individual tolerance requirements of 5.2.1~5.2.4, the final inspection of internal and external threads shall be carried out by using a gauge that complies with GB/T4749 to detect the close distance as the basis for acceptance or rejection. A qualified calibration gauge is the benchmark for detecting the workpiece thread, and a qualified calibration ring gauge is the conversion benchmark for detecting the workpiece thread. When using a working gauge to detect the close distance of the workpiece thread, the transfer error between the working gauge and the calibration gauge shall be taken into account. The calibration gauge transfers the error to the working gauge through the S,, S, values. When using the calibration gauge and the working gauge to detect the workpiece thread, it shall comply with the provisions of Figure 4. The close distance value in Figure 4 refers to the general drill stem connection thread without coating. For coated threads and drill stem components and drill bit connection threads with sealing elements, the close distance value may be different from Figure 4. 15
S(for NC1
GB/T9253.7--1999
0~~ 0. 254(for NC10 ~ NC16
NC16 is $*9.3m)
S,-8 (for NC10-
N16 is 2*9-38)
Compared with the ring gauge
External screw
1. For the ring gauge
External thread
The deviation direction is opposite to the figure）
(S+-S)_24(for NC10~NC16
is (S; --S)+B 2547
Figure 4 Proofing gauge and working gauge and workpiece thread close distance 5.2.6 Other dimensional tolerances and geometric tolerances of thread structure shall comply with the provisions of Figure 2 and Table 2 6 Thread interchangeability and special structure
Internal thread
Proofing gauge
Internal thread
Working gauge
6.1 Interchangeable connecting thread
The thread of digital type V-0.038R tooth type can be interchanged with the thread of V-0.065 tooth type with the same base surface diameter. The interchangeable threads are as follows: NC26 and 2%IF
NC31 and 2%IF
NC38 and 3IF
NC40 and 4 FH
NC46 and 4 IF
NC50 and 4%IF
6.2 Special structure
For the connection threads of drill chain and small-size drill column (NC10～NC16), the end of the internal and external threads can be processed with special structures such as sealing groove, stress dispersion groove, sealing cone, etc. according to the needs. 7 Marking
GB/T9253.1-1999
The thread of the oil drill pipe joint uses the thread code in Table 2 as the thread mark, and the left-hand thread code is followed by "IH". Example: 4 REG-1H
NC50 (IF) indicates an interchangeable thread. Its tooth profile can be processed into V-0.038R or V.0.065. NC50
indicates a digital thread that can only be processed into V-0.038R tooth profile. It indicates an internal flat thread with a tooth profile of V-0.065. For interchangeable threads, if only the internal flat or through-hole thread code is marked (such as 4 IF in the above example), the tooth profile is allowed to be processed into V-0.038R.
The size of the thread tooth profile is in accordance with Table A1.
Original triangle
Tooth profile code
Height of the shape
GB/T 9253. 1-1999
Appendix A
(Standard Appendix)
Inch Dimensions of Petroleum Drill Pipe Connectors
Thread Profile Size
Thread Bottom Flattened
Thread Profile Height
Jn= fo
0. 216 005 0. 121 844 [0. 038 000 |0. 056 161;0.215 379 0. 121 3810. 038 000 0. 055 998]0. 172 3030. 117 8420. 020 00 10. 034 1610. 215 3790. 147 303 0. 025 000 0.043075
10. 216 0050. 147 804 0. 025 000j0. 043 2010.1441
0.2160050.111 5490.048385
50.056161
Petroleum drill pipe joint thread inch size according to Table A2. A2
Table A2 thread basic size
Thread code
[per inch
thread tooth
V-0. 055 6
IV-0. 038R
jV 0.038Rj
IV-0.038R
IV-0.038R
Base surface median diameter
External thread
Root diameter
External thread major diameter
End major diameter
±1/64
Digital type (NC)
Crest width, bottom width
Fan - i
External thread
External thread
Thread arc
Internal thread
Effective thread
Thread length
Internal thread
-+-378
Australian price half
Thread code Thread tooth type size
6% REG
7% REG
8% REG
GB/T 9253. ---1999
Table A2 (Complete)
External thread
External thread major
Root diameter
Pitch diameter
End major diameter
Piercing diameter
2. 668 00
±1/64
Digital type (NC)
5.2505.135
Regular type (REG)
Through hole type (FH)
Internal flat type (IF)
1) The deviation for NC10~NC16Qc is ±0. 005.2.750bzxZ.net
External thread
External thread
Internal thread
Effective thread
Thread length
Internal thread
Expanded cone hole
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