Slot layout and anti-collision technical requirements of platform cluster well drilling
1 Scope
This standard specifies the slot layout and anti-collision design and construction technical requirements of platform cluster well drilling.
This standard is applicable to slot layout and anti-collision design and construction of platform cluster well drilling.
Other wells with the risk of well bore collision can refer to the relevant contents of this standard.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) applies.
GB/T 28911 Vocabulary of drilling engineering for the petroleum and natural gas
SY/T 5431 The design method of casing program
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 28911 and the following apply.
3.1
separation factor
ratio of the center to center between the two shafts to the sum of the major axis radii (R1 and R2) of the error ellipse of the two shafts (see Annex A)
3.2
anti-collision section
section having separation factor less than 2 from adjacent wells or the nearest distance from adjacent wells less than 20m
4 Principle for platform arrangement for the cluster well
4.1 Principles for determining platform position
It shall meet the requirements of geological design, drilling and oil production technology as well as safety and environmental protection.
4.2 Principle for platform arrangement for the cluster well
4.2.1 The location of cluster well platform shall be selected according to the coordinates and maximum displacement of the target point to be drilled and the geographical conditions. The platform shall be located on the centroid of the plane particle system composed of unit particles at each well target. When the centroid is not on the target coordinate, the platform position shall be moved to the target coordinate nearest to the centroid, as shown in Annex B.
4.2.2 The corresponding distribution relationship between wellhead and target point of the platform shall be such to minimize sum of horizontal displacements of wells in the platform, and avoid intersection of azimuth lines.
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Principle for platform arrangement for the cluster well
5 Anti-collision design of well bore
6 Technical requirements for construction of anti-collision section
Annex A (Normative) Separation factor
Annex B (Normative) Platform position determination
Annex C (Normative) Nearest distance scanning method
Annex D (Informative) Anti-collision scanning
