Casing design Clause Samples

Casing design. Casing materials and casing design have in past decades been designed with available API standard materials. The New Zealand standard NZS 2403:1991 “Code of practice for deep geothermal ▇▇▇▇▇” has been the backbone in casing and wellhead design and in the year 2015 it was updated to NZS 2403:2015, with modified recommendations for casing depth selection, design factors, design curves and more. Conventional casing specification and design is based on axial compressive and tensile loads, and differential pressure between the inner and outer casing wall. Anticipated load cases during drilling and after well completion, and design steps to avoid common failure modes are included in the New Zealand standard. Generalized casing design steps are as follows (further described in the New Zealand standard); 1. Gather all data on the site and formation conditions including: a. Geological lithology of the formation b. Temperature and pressure conditions with depth c. Conditions of the formation and anticipated problem zones, such as lost circulation depths and information on loose formations 2. Define the maximum pressure and temperature profiles with depth 3. Calculate overburden and fracture pressure of the formation with depth 4. Calculate the minimum casing shoe depths with the criteria of well control for each drilling phase 5. Decide the desired open-hole diameter of the well 6. Calculate for all casings, strength against loads during casing installation, cementing and production 7. Design iteratively by revising the design if any changes are made For deep ▇▇▇▇▇, where the design pressure at depth at around 3500-4000 m will be higher than the critical point, assumptions on the pressure changes with increased depth of the fluid need to be taken. Once maximum pressure and temperature profiles have been defined and containment pressure for depth calculated, minimum casing shoe depths can be determined. The minimum casing shoe depth varies depending on selected criteria, which needs to be evaluated for each case. Once casing shoe depths have been selected, structural calculations for each casing string is calculated, these include (further described in the New Zealand standard): 1. Axial tensile stress during running and cementing casing 2. Burst and collapse calculations during cementing 3. Burst and collapse during production of steam 4. Compressive thermal loading (strain) 5. Bi-axial tensile stress due to wellhead pressure 6. Helical buckling of liner These calc...

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  • General Scope of Work The Scope of Work and projected level of effort required for these SERVICES is described in Exhibit “A” attached hereto and by this reference made a part of this AGREEMENT. The General Scope of Work was developed utilizing performance based contracting methodologies.

  • Final Design Provide OWNER with proposed final construction drawings and detailed opinions of probable total Project construction costs in writing for OWNER' s review, prior to completion of the final Contract Documents, so that any changes that may be necessary in accordance with Project' s budgetary schedule can be made prior to bid.

  • No Process or Design Changes Supplier shall not make any process or design changes affecting Products or Services without DXC’s prior written consent.

  • Final Design Phase A. After acceptance by Owner of the Preliminary Design Phase documents, revised opinion of probable Construction Cost as determined in the Preliminary Design Phase, and/or any other Right of Way plan documents, subject to any Owner-directed modifications or changes in the scope, extent, character, or design requirements of or for the Project, and upon written authorization from Owner, Engineer shall: 1. Prepare final Drawings and Specifications indicating the scope, extent, and character of the Work to be performed and furnished by Contractor. 2. Visit the Site as needed to assist in preparing the final Drawings and Specifications. 3. Provide technical criteria, written descriptions, and design data for Owner’s use in filing applications for permits from or approvals of governmental authorities having jurisdiction to review or approve the final design; assist Owner in consultations with such authorities; and revise the Drawings and Specifications in response to directives from such authorities, as appropriate. 4. Advise Owner of any recommended adjustments to the opinion of probable Construction Cost. 5. After consultation with Owner, include in the Construction Contract Documents any specific protocols for the transmittal of Project-related correspondence, documents, text, data, drawings, information, and graphics, in electronic media or digital format, either directly, or through access to a secure Project website. Any such protocols shall be applicable to transmittals between and among Owner, Engineer, and Contractor during the Construction Phase and Post- Construction Phase, and unless agreed otherwise shall supersede any conflicting protocols previously established for transmittals between Owner and Engineer. 6. Assist Owner in assembling known reports and drawings of Site conditions, and in identifying the technical data contained in such reports and drawings upon which bidders or other prospective contractors may rely. 7. In addition to preparing the final Drawings and Specifications, assemble drafts of other Construction Contract Documents based on specific instructions and contract forms, text, or content received from Owner. 8. Prepare or assemble draft bidding-related documents (or requests for proposals or other construction procurement documents), based on the specific bidding or procurement-related instructions and forms, text, or content received from Owner. 9. Contract shall include contractor provided changeable message signs to communication construction information. 10. Furnish for review by Owner, its legal counsel, and other advisors, 6 copies of the final drawings and Specifications, assembled drafts of other construction Contract Documents, the draft bidding-related documents (or requests for proposals or other construction procurement documents), and any other final design Phase deliverables, by the established due date, with the Final Design Phase, and review them with Owner. Owner shall submit to Engineer any comments regarding the furnished items, and any instructions for revisions. B. Engineer’s services under the Final Design Phase will be considered complete on the date when Engineer has delivered to Owner the final Drawings and Specifications, other assembled Construction Contract Documents, bidding-related documents (or requests for proposals or other construction procurement documents), and any other Final Design Phase deliverables. C. In the event that the Work designed or specified by Engineer is to be performed or furnished under more than one prime contract, or if Engineer’s services are to be separately sequenced with the work of one or more prime Contractors (such as in the case of fast- tracking), Owner and Engineer shall, prior to commencement of the Final Design Phase, develop a schedule for performance of Engineer’s services during the Final Design, Bidding or Negotiating, Construction, and Post-Construction Phases in order to sequence and coordinate properly such services as are applicable to the work under such separate prime contracts.