Mitigated Riser Response During Submerged BOP Move Through Use of Drillstring Active Heave Compensation System

2019 ◽  
Author(s):  
Lucas Cantinelli Sevillano ◽  
Celso Kazuyuki Morooka ◽  
Sigbjørn Sangesland
Keyword(s):  
Environmental Conditions ◽  
Development Project ◽  
Compensation System ◽  
Dynamic Responses ◽  
Substantial Part ◽  
Field Development ◽  
Drilling Rig ◽  
Deep Waters ◽  
Commercial Program ◽  
Offshore Field

Abstract Rig costs account for a substantial part of the total cost of an offshore field development project. Systems and methods that can reduce the non-productive time are therefore of interest to operators. In deep and ultra-deep waters, the duration of drilling campaigns with multiple, closely located wells may potentially be reduced by optimizing equipment-retrieving procedures between moving from one drilling location to another. This may be achieved by not retrieving the whole drilling riser and the BOP to the surface. Instead, retrieving just a few joints and navigating the drilling rig with the drilling riser and BOP suspended may save several days of rig time. Previous works on this topic have investigated the riser response during the move and delineated under which environmental conditions (waves and current) this operation may be safely executed. The axial displacement of the riser column may be of concern, and it has been presented that the hang-off condition may substantially influence the response of the riser. Instead of looking at the riser hanging either from the spider-gimbal or from the tensioners, this work proposes to use the active heave compensation system of the drillstring to more efficiently decouple motions of the rig from the riser during the move. Thus, mitigating the riser response and enabling the navigation with the suspended riser and BOP to take place under broader environmental conditions. A commercial program for computational simulations of the riser dynamic responses was used in the study presented in this paper. A representation of the active heave compensation drilling system and the tool used to achieve this purpose were added to the model. The responses of a typical riser used in deep water were determined under several environmental conditions, and the responses of different hanging systems were compared. Results indicate that the proposed approach for suspending the riser may decrease the dynamic forces and stresses during the rig move. The ability of the modeled rig equipment to withstand the move was also investigated.

A Methodology for the Selection of an Alternative for a Floating Production System

2002 ◽  
Author(s):  
C. K. Morooka ◽  
G. T. Castro
Keyword(s):  
Production System ◽  
Net Present Value ◽  
Development Project ◽  
Internal Rate Of Return ◽  
Field Development ◽  
Economical Analysis ◽  
Selection Decision ◽  
Offshore Field ◽  
Oil Company ◽  
Selection Of

For the selection of a field production system in order to decide among several alternatives, in general, an oil company bases itself mainly on economical analysis aspects, such as net present value and internal rate of return. However, the evaluation of a field development project, generally speaking, needs a methodology for the selection of the best alternative that complies proportionally with all the objectives of the company. Which means that several other aspects besides the financial one should be taken into account in the selection decision process. The main purposes of the present work is to present the methodology for decision-making that supports selection of the best floating production system, for a given offshore oilfield. As an example, a typical field development project is evaluated based on this method. The present paper shows the importance to include technological, safety and environmental risk besides the usual financial one, used for selecting the best alternative of a floating production system in offshore field development.

Approach for Effective Design and Cost Estimation of New built / Conversion FPSO (2014)

2014 ◽  
Author(s):  
Upendra Malla ◽  
Krishna M. Karri
Keyword(s):  
Cost Estimation ◽  
Structural Design ◽  
Effective Means ◽  
Step Method ◽  
Support Design ◽  
Field Development ◽  
Early Stages ◽  
The Cost ◽  
Offshore Field ◽  
Effective Design

Floating Production Storage and Offloading (FPSO) sizing and cost estimation has become a challenging task at the early stages of offshore field development. During the early stages of field development designer needs to size and estimate cost in order to decide feasibility of the project. This paper describes a step by step method used to size and estimate the cost of a new built (or) converted FPSO based on basic engineering, existing FPSO data and corresponding metocean criteria for a particular location. This step by step approach covers FPSO sizing, hull structural design, mooring sizing, topsides support design and steel renewal using offshore classification rules and regulations. FPSO cost is estimated based on the design particulars (i.e. hull weights, FPSO particulars, mooring sizes etc.) and current market unit rates. This approach is an effective means to size and estimate cost of an FPSO at early stages of field development which saves overall time and cost for a client.

Transition to New Reserves Reporting System in Kazakhstan: Challenges and Benefits

2021 ◽  
Author(s):  
Adil Mukanov ◽  
Asset Zhumadil
Keyword(s):  
Reporting System ◽  
Current System ◽  
State Committee ◽  
Development Project ◽  
Point Of View ◽  
International Standards ◽  
Field Development ◽  
The Republic ◽  
Scr System ◽  
New System

Abstract The 74th step of "100 Concrete Step of Nation Plan" initiated by the first president of the Republic of Kazakhstan (RoK) Nursultan Nazarbayev states that Kazakhstani reserves reporting system must be changed to the international standards. One of them actively proposed is the SPE-PRMS. Therefore, the main goal of the paper is to show challenges of the transition, discuss possible problems, their solution and, eventually, advantages for the companies. In the paper the main aspects of the current State Committee of Reserves (SCR) system or well-known as GKZ system inherited from the Soviet system and used in Kazakhstan are reported. Especially, we try to highlight the reserves categories of A, B, C1 and C2 and their impact on further field development in details. Also SPE-PRMS and SEC rules are shown in terms of differences and similarities with the current system. Importantly, authors demonstrate how the SPE-PRMS standards are wide-spread around the globe. Finally, details of planned shift, some recommendations and simplification of reporting process are exhibited. As the result of the study the following points are investigated. Firstly, what will be with reports just recently approved by the SCR. Especially, for the big fields whose preparation takes up to several years. Secondly, what the frequency is for the reporting. Thirdly, whether the reports will be handled through several approval stages or just submitted. Moreover, how close to SPE-PRMS the new system should be adopted taking into account Kazahstani realities and if the reports should be composed in English along with Russian, since the main purpose of the transition is to be clear and transparent for the foreign investors. Otherwise, unfamiliar language and big deviation from the well-known standards may ruin the efforts. Despite the complexity of these issues the benefits of the new system are obvious and there are several reasons. The main advantage is that the SPE-PRMS is all about economically recoverable reserves without any ties with fixed recovery factor. In addition, report is done in short time and less volume. Finally, if the norm of the report's submission without going to tedious approval process is accepted, that will ease work of the subsoil users’ because it accelerates further preparation of field development project. The study is done due to recent changes of the RoK subsoil usage regulations, where the requirement for reserves reporting system's transition to the new international standards is mentioned. However, the issue is not much highlighted in technical publications from the operating companies’ point of view. Thus, having experience with GKZ, SPE-PRMS and SEC systems the authors take this opportunity to show challenges and benefits of the decision.

Offshore Field Development

2019 ◽  
pp. 207-212
Author(s):  
Shashi Shekhar Prasad Singh ◽  
Jatin R. Agarwal ◽  
Nag Mani
Keyword(s):  
Field Development ◽  
Offshore Field

First Application Drilling New Wells with HWU in Swamp Environment, Mahakam Delta

2021 ◽  
Author(s):  
R. A. S Wijaya
Keyword(s):  
Drilling Rate ◽  
Shallow Gas ◽  
Field Development ◽  
Drilling Rig ◽  
East Kalimantan ◽  
Well Location ◽  
Shallow Wells ◽  
Drilling Unit ◽  
Mature Field ◽  
Mahakam Delta

Tunu is a mature giant gas and condensate field locate in Swamp Area on Mahakam Delta, East Kalimantan, Indonesia. The field has been in developed for more than 40 years and considered as a mature field. As mature field, finding an economic well has become more challenging nowadays. The deeper zone of Tunu (TMZ) has no longer been considered profitable to be produced and the focus is shifted more on the producing widespread shallow gas pocket located in the much shallower zone of Tunu (TSZ). Facing the challenge of marginal reserves in the mature field, Pertamina Hulu Mahakam (PHM) take two approaches of reducing well cost thus increase well economics, improving drilling efficiency and alternative drilling means. Continues improvement on drilling efficiency by batch drilling, maxi drill, maximizing offline activities and industrialization of one phase well architecture has significantly squeezed the well duration. The last achievement is completing shallow well in 2.125 days from average of 6.5 days in period of 2017-2019. Utilization of Swamp Barge Drilling Rig on swamp area had been started from the beginning of the field development in 1980. Having both lighter and smaller drilling unit as alternative drilling means will give opportunity of reducing daily drilling rate. Hydraulic Workover Unit (HWU) comes as the best alternative drilling means for swamp area. In addition, fewer and smaller footprint equipment requires smaller barges with purpose of less civil works to dredge the river and preparing well location. Drilling with HWU project has been implemented at Tunu area with 5 wells has been completed successfully and safely. HWU drilling concept considered as proven alternative drilling means for the future of shallow wells development.

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