CSA Group CSA Z625:16 (reaffirmed 2021) Well design for petroleum and natural gas industry systems

Preface

This is the first edition of CSA Z625, Well design for petroleum and natural gas industry systems.

Operators need to work with other industries, as well as governmental agencies, in order to effectively manage the design process of their energy infrastructure. Therefore, this Standard is meant to be read in conjunction with other security legislation, safety legislation, best practices, policies, standards, and applicable codes.

CSA Group acknowledges that the development of this Standard was made possible, in part, by the support of the regulatory organization and industry participants.

CSA Group acknowledges that the development of Update No. 1 was made possible, in part, by the financial support of Natural Resources Canada.

This Standard was prepared by the Technical Committee on Well Design, under the jurisdiction of the Strategic Steering Committee on Petroleum and Natural Gas Industry Systems.

Notes:

1) Use of the singular does not exclude the plural (and vice versa) when the sense allows.

2) Although the intended primary application of this Standard is stated in its Scope, it is important to note that it remains the responsibility of the users of the Standard to judge its suitability for their particular purpose.

3) This Standard was developed by consensus, which is defined by CSA Policy governing standardization — Code of good practice for standardization as “substantial agreement. Consensus implies much more than a simple majority, but not necessarily unanimity”. It is consistent with this definition that a member may be included in the Technical Committee list and yet not be in full agreement with all clauses of this Standard.

4) To submit a request for interpretation of this Standard, please send the following information to [email protected] and include “Request for interpretation” in the subject line:

a) define the problem, making reference to the specific clause, and, where appropriate, include an illustrative sketch;

b) provide an explanation of circumstances surrounding the actual field condition; and

c) where possible, phrase the request in such a way that a specific “yes” or “no” answer will address the issue.

Committee interpretations are processed in accordance with the CSA Directives and guidelines governing standardization and are available on the Current Standards Activities page at standardsactivities.csagroup.org.

5) This Standard is subject to review five years from the date of publication. Suggestions for its improvement will be referred to the appropriate committee. To submit a proposal for change, please send the following information to [email protected] and include “Proposal for change” in the subject line:

a) Standard designation (number);

b) relevant clause, table, and/or figure number;

c) wording of the proposed change; and

d) rationale for the change.

1 Scope

① 1.1

This Standard covers the design of wells in the land-based sector of the energy industry. This Standard is inclusive of wellhead to final drilled depth.

1.2

This Standard addresses

a) casing, including casing design for various types of wells, including but not limited to horizontal and directional wells;

b) cementing, including cement design and centralization issues and practices; and

c) wellhead, including design, and assembly.

① 1.3

This Standard does not apply to

a) completion;

b) operations;

c) abandonment;

d) remedial cementing;

e) interventions;

f) suspensions;

g) competencies;

h) management system requirements;

i) drilling operations;

j) emerging technologies;

k) design tools; and

l) offshore and arctic applications.

1.4

This Standard is intended to establish essential requirements and minimum standards for the design of wells in the oil and gas industry. This Standard is not a design handbook, and competent design practice and judgment must be employed with its use.It is not the intent of this Standard to prevent the development of new equipment or practices, nor to prescribe how such innovations should be handled.

1.5

The requirements of this Standard do not apply retroactively to existing installations or installations under construction at the time of publication, but they do apply to the extension, replacement, maintenance, and upgrading of such installations.

1.6

In this Standard, “shall” is used to express a requirement, i.e., a provision that the user is obliged to satisfy in order to comply with the standard; “should” is used to express a recommendation or that which is advised but not required; and “may” is used to express an option or that which is permissible within the limits of the Standard.

Notes accompanying clauses do not include requirements or alternative requirements; the purpose of a note accompanying a clause is to separate from the text explanatory or informative material.

Notes to tables and figures are considered part of the table or figure and may be written as requirements.

Annexes are designated normative (mandatory) or informative (non-mandatory) to define their application.