SY/T 5088-2002 Items and calculation methods for evaluating wellbore quality
Some standard content:
ICS 75.020
Registration No.: 10420--2002
Petroleum and Natural Gas Industry Standard of the People's Republic of China SY/T 5088—2002
Replaces SY/T 5088-93
Wellborc guality evaluztion items and calculation rnethods2002- 05- 28 Issued
State Economic and Trade Commission
2002-08-01 Implementation
2 Normative reference documents
3 Items for assessing the quality of parallel body
4 Calculation method for assessing the quality of parallel body
5 Principles for processing inclinometric data
Appendix A (Visual Appendix)
Appendix B (Normative Appendix)bZxz.net
Calculation formulas for the mean angle method and calibration mean angle method Calculation formulas for the cylindrical spiral method
Appendix C (Normative Appendix)
Calculation formulas for the minimum curvature method
SY/T 5088-—2002
SY/T 5088—2002
This standard is a revision of 5YT5088-93 "Items and calculation methods for assessing the quality of parallel body". This standard clarifies some conceptual issues in the original standard, such as the average azimuth, that is, the center and the angle (loss and the distance); the average angle method, and screens the existing well trajectory calculation methods. Four calculation methods with calculation accuracy that can meet the needs of the site and are easy to operate are recommended:
Since its release, this standard has replaced the appendix A, appendix, and appendix (normative appendix) of SY/5088-93. This standard was proposed and coordinated by the Petroleum Drilling Engineering Professional Standardization Committee. The drafting unit of this standard: Drilling and Production Technology Research Institute of Sichuan Petroleum Administration Bureau. The main drafters of this standard: Ai Jingtao, Han Lieyang, Liu Sujun. The previous versions of the standards replaced by this standard are: SY/T 5088-93.
1 Scope
Items and calculation methods for evaluating drilling quality This standard specifies the items and calculation methods for evaluating drilling quality: This standard applies to vertical, directional and horizontal drilling for exploration and development of oil and natural gas. 2 Normative references
SY /F 5088-2002
The clauses in the following documents become the clauses of this standard through reference in this standard. For any dated referenced document, its subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, the parties who reach an agreement based on this standard are encouraged to study whether to use the latest versions of these documents. For any undated referenced document, its latest version applies to this standard. SY/T5955-1999 Drilling technology and drilling quality requirements for fixed wellsSY/T6333-1997 Drilling technology and drilling quality requirements for water wells Quality requirements 3 Items for evaluating wellbore quality
3.1 Items for evaluating wellbore quality
a) Maximum full-angle change rate Gm, (\)/30m; h) Horizontal displacement of wellbore specified point 5z, m; e) Average diameter expansion rate, %;
d) Maximum wellbore diameter expansion rate C, %
Note 1: In drilling design, the body specifications should be made according to the exploration and development requirements. Note 2: In drilling non-specified points, specific provisions should be made for the meaning of pairs, such as "bottom of the well", "layer of the day", etc. 3.2 Oriented wellbore quality Items of measurement: a) Maximum full angle change rate G, (\) 730m; Bull's eye horizontal distance Ss, m; Bull's eye vertical distance AH, m; d) Bull's eye relative distance iR, m; Average parallel diameter expansion rate (,,%;) Maximum horizontal expansion rate m,%: Note 1: In drilling design, specific provisions should be made for each section according to the requirements of exploration and development. Note 2: For general directional wells, only the horizontal distance of the bull's eye needs to be specified; if necessary, the annual distance of the bull's eye can also be specified at the same time. For special directional wells (such as dangerous wells) Well). Only the center of the target space needs to be specified.
Note 3: The calibration film should be checked for the center distance. Note 4: The calibration and allowable full-angle change rate shall be implemented in accordance with SY/I5955-1999. 3.3 Items of horizontal well quality
The assessment items of horizontal well quality shall comply with the requirements of 3.13.2, 3.3, 3.4, 3.5, Chapter 8 and Chapter 9 of 8Y/16333--1997.
4 Calculation method for assessing the quality of horizontal well
4.1 Full-angle change rate
SY/T 5088—2002
4.1.1 Calculation method
The full angle change rate is calculated according to formula (1):
/ (aa -a)? FApasin ah
Gab = ALaN
Wherein:
The full angle change rate of the well section between the measuring point and the existing well, (\)/30mC
—The length of the well section between the measuring point and the existing well,;
The parallel inclination angle at the measuring point, (\);
The inclination angle at the measuring point b, (\);
△——The azimuth change between the measuring points a and b (α and the angle between the azimuth of the measuring point and the terminal inclination), (\) Note: If the absolute value of ≥ (一) is greater than 180°, when >, then =.一360；When 蚁>, then 一中一3604.1.2 Lookup table method
In order to reduce the calculation workload, the full angle change rate lookup table made according to the above formula can be used for calculation. 4.2 Horizontal displacement of a specified point in a vertical wellbore
4.2.1 The horizontal displacement of a specified point in a vertical wellbore should be calculated based on the coordinate value of the specified point in the wellbore and the coordinate value of the wellhead. (1)
4.2.2 When calculating the coordinate value of a specified point in the wellbore based on the well inclination measurement data, the average angle method, the corrected average angle method, the cylindrical spiral method, and the minimum curvature method can be used for calculation. The calculation formulas are shown in Appendix A, Appendix B, and Appendix C. 4.3 Wellbore expansion rate
4.3.1 Average wellbore expansion rate
The average wellbore expansion rate of a certain section is calculated by formula (2): Di± - D × 100%
Wherein:
C, average wellbore expansion rate, expressed in percentage; —— measured average wellbore diameter, m;
D—— drill bit diameter, mm,
4.3.2 Maximum wellbore expansion rate
The maximum positive diameter expansion rate of a certain section is calculated by formula (3): Dah-Db×100%
Wherein:
Cm——maximum wellbore expansion rate, expressed in percentage; Dmh
measured maximum wellbore diameter, mm.
4.4 Directional well target center distance
4.4.1 Horizontal distance of target center
The horizontal distance of the target center of the directional well should be calculated based on the coordinates of the intersection of the borehole axis and the target area plane (center target point) and the designed target center: when calculating the coordinates of this intersection and the target center based on the well inclination measurement data, the average angle method, the corrected average angle method, the cylindrical spiral method, and the minimum curvature method can be used for calculation. The calculation formulas are shown in Appendix A, Appendix B, and Appendix C. 4.4.2 Vertical distance of target center
The vertical distance of the target center is equal to the difference between the vertical depth of the intersection of the borehole axis and the target area plane (center target point) and the vertical depth of the designed target center. The vertical depth of the actual center target point can be calculated by the average angle method, the corrected flat charge angle method, the cylindrical spiral method, and the minimum curvature method. The calculation formulas are shown in Appendix A, Appendix B, and Appendix C. 2
4.4.3 Bull's eye space distance
The bull's eye space distance of a fixed well is calculated according to formula (4): Where:
Bull's eye space distance, m;
△H——bull's eye vertical distance, m;
S.—bull's eye horizontal distance, m:
Principles of inclination data processing
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5.1 In drilling and design, the spacing of inclination points should be specified in sections. 5.2 The unit of inclination angle measurement is "degree". 5.3 The unit of azimuth angle measurement is "degree". 5.4 When the full angle change rate value exceeds the standard at one point in a row, the wellbore quality is unqualified. SY/T 5088—2002
SY/T 5088—2002
Appendix A
(Normative appendix)
Calculation formulas for the average angle method and the corrected average angle method Calculation formulas for the horizontal displacement of the specified point and the horizontal and vertical distance of the center of the directional well Calculation basis and calculation items H
The horizontal displacement of each measuring point L; + m
The non-inclined slice α of each measuring point:, (\)
The azimuth of each measuring point, (\)
Designed vertical depth of the center of the well H,
Wellhead coordinates No, Eo, m
Designed center of the center coordinates N., Ea, m
: Section length of the well section
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