New JIP Opportunities with Important Ramifications
Deep Water Offshore Applications
With the development of new, deeper water offshore locations, and the increasing H2S levels of both newer and older reservoirs, special considerations have arisen for material selection relative to sulfide stress cracking (SSC). Many of these completions are operating in water depths that subject materials to combinations of low temperatures down to 5 C and dynamic loading. As higher H2S partial pressures are being encountered from new and existing reservoirs, unresolved questions are being asked regarding resistance to SSC of many commonly used materials. In some cases, industry guidelines as found in NACE MR0175/ISO 15156 have been developed through consensus without verification by testing or evaluation.
Mostly, the concerns are for commonly utilized materials (up to 110 ksi SMYS) such as high strength steels, modified 13Cr, and for materials like 17-4 PH SS, 316 SS, and Monel 400. These later materials are widely used in sweet service, but have not been evaluated for SSC limits to the same degree as newer alloys included in NACE MR0175/ISO 15156 standard. However, as H2S partial pressures increase, tendencies for SSC will likely increase, but experience with the development of the new MR0175/ISO 15156 standard has shown that little data is available from which to develop SSC limits over a range of H2S partial pressure, pH, and temperature.
Evaluation and selection
of materials for sour oil and gas service essentially started in the
1950’s, accelerated in the 1970’s with concerns for deep
sour wells, and again in the 1980-90’s with North Sea applications.
However, much of this effort has been directed at characterizing the
behavior of materials used in onshore wellhead components and downhole
tubulars where service temperatures were primarily higher than ambient
temperature. In this work, it was found that the susceptibility to SSC
generally decreased with increasing temperature over the range of around
room temperature to over 125 C. Many of these studies utilize standard
test methods conducted at
In limited studies, it was also learned that susceptibility to SSC is actually higher at a temperature somewhat below room temperature. However, there is only inadequate data on SSC of commonly used materials at temperatures below 24 C to develop SSC limits.
Furthermore, evaluations for SSC have been primarily ben conducted under conditions of static load (stress), with threshold stresses determined under this simple loading condition. This type of analysis is fine for designs that are based on primarily static loading. However, many companies utilizing offshore components such as risers and flow lines are using dynamic designs to achieve production from deeper water locations. The role of dynamic loading on threshold behavior has not been adequately examined to provide a rigorous design basis for dynamic designs.
Based on these considerations, three topics for testing and evaluation have been assembled in this proposal.
InterCorr is pleased to announce that it has developed a new flexible joint industry program (JIP) format for evaluation of the abovementioned topics. Under this new effort, InterCorr has identified specific focused studies on these topics related to SSC. Each topic will be funded by multiclient support and each will have a fixed scope of work and deliverables which can be completed within a one-year project period (calendar year 2005 running from 1st Quarter through 4th Quarter 2005). Sponsors will have the ability to fund any or all projects identified below.The JIP projects identified for FY 2005 are defined below:
A special feature of this program is an option for the sponsors to have additional tests conducted under similar conditions on a proprietary and preferred price basis.
In most cases, alloy selection will focus on generics with alloys selected based on minimum composition and maximum strength considerations.
The details of the three experimental programs and funding levels for each follow:
The initial benefit of this new flexible JIP format is that participating companies will pay only a portion of the total cost of these projects. Additionally, the program will set specific one year goals for funding and deliverables. All reporting will be paperless providing data in electronic format and a secure JIP website which will be used to archive the program data and deliverables for easy access by participating companies.
Additionally, InterCorr will utilize the secure website to develop any ballot items for MR0175/ISO 15156. This will include the use of an online forum for reviewing ballot items that may results from this program.
Sponsors may fund individual and multiple projects. To build further consensus and support, each sponsor will have an option to conduct a designated number of tests within certain parameters on a proprietary and preferred price basis at extra cost, if they choose.
Furthermore, the results from this program will be held in confidence among the sponsoring companies for a period of at least two years from their release to the program sponsors or until approval is given from the sponsors to release the data for purposes of NACE ballot preparation or industry standards initiatives.
Companies desiring to join the program after the 1st quarter 2005 will have to pay 15 percent higher fees than those paid by the original program sponsors. This arrangement gives the initial program sponsors maximum leveraging of their sponsorship fee. Sponsors can utilize year end FY 2004 or FY 2005 funding to participate in this program.
Per company fee for participation in all three projects (Projects 2005 A-C) is $20,000 or $25,000 including the Optional Project Addendum. The fees will be payable in two installments at the start and completion of the projects.
The cost of participation in these tasks is based on the participation of six (6) companies and includes costs associated for testing, engineering, program management and administration, and reporting. If additional companies agree to participate additional scope may be added to particular projects. The scope of the additional studies will be determined by the specific funding level available and needs of the sponsoring group. Alternatively, greater shared costs may be considered (with the approval of the sponsors) to accomplish the project deliverables of specific tasks should less than six companies agree to participate.
Input for this program has been received from prospective sponsors resulting from the initial solicitation submitted earlier this year. The projects have been modified according to this input. Interest and support is being solicited for this program planned for initiation in 1st Quarter 2005.
Those interested to obtain more information, discuss the details of this program, or review a participation agreement, please contact Dr. R.D. Kane or Ms Dawn Eden at +1 (281) 444-2282 or by email at: email@example.com or firstname.lastname@example.org.
We look forward to your support of this interesting and timely program.
Figure 1 - SSC domains as a function of pH and H2S partial pressure
InterCorr International, Inc.
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