Shallow Water Subsea Well Drilling and Completion Utilizing Jack Up Rig at Natuna Sea Block

2021 ◽  
Author(s):  
S. Rahutomo
Keyword(s):  
Shallow Water ◽  
Water Depth ◽  
The Other ◽  
Third Party ◽  
Collaborative Engineering ◽  
Well Drilling ◽  
Significant Time ◽  
Safety Case ◽  
Structure Assembly ◽  
Jack Up

In 2019, Premier Oil Indonesia commenced drilling campaign to complete 4 development wells consist of 3 subsea development wells and 1 platform well at Natuna Sea Block with water depth 260ft - 280ft. To optimize the mobilization and demobilization cost, one single Jack Up rig was selected to complete those 4 wells. The Jack Up rig require several modifications to enable drilling and completing subsea wells. The Jack Up rig is equipped only with surface BOP stack; therefore, 16” HP riser is utilized to drill reservoir section then a Suspended Texas Deck (STD) was required as means to suspend the weight in order to hang 16” HP riser stack and also it is designed to take the full BOP weight in the event the secondary BOP tensioner fail. A modification work was also performed on Conductor Tensioner Platform (CTP) to extend it to accommodate Subsea Tree temporary storing of Subsea Tree complete with Tree Running Tool (TRT) for inspection and preparation prior to subsea deployment. On the other hand, Subsea Tree has Protection Structure Assembly (PSA) has the biggest dimension among other subsea equipment which leaving only option to be deployed by TDS directly from supply vessel to the wellhead using ROV-friendly lifting bridle arrangement. The drilling campaign has successfully completed and met drilling objectives without major safety case. It is proven that with collaborative engineering works involving company, rig contractor and third party contractors enabling the success of subsea drilling and completion campaign in shallow water at Natuna Sea Block using Jack-up rig. The lesson learned was established upon completing drilling the 1st well then applied to next well resulting significant time improvement to complete the well from 52 days to become only 35 days, noting that these 2 wells have similar drilling and completion profile.

Resistance Tests of an Articulated Pusher Barge System in Deep and Shallow Water

2021 ◽  
Author(s):  
Li Zhang ◽  
Lei Xing ◽  
Mingyu Dong ◽  
Weimin Chen
Keyword(s):  
Shallow Water ◽  
Water Depth ◽  
Deep Water ◽  
Water Resistance ◽  
Model Tests ◽  
System 2 ◽  
Changing Trend ◽  
The Difference ◽  
Transport Vessel ◽  
Resistance Performance

Abstract Articulated pusher barge vessel is a short-distance transport vessel with good economic performance and practicability, which is widely used in the Yangtze River of China. In this present work, the resistance performance of articulated pusher barge vessel in deep water and shallow water was studied by model tests in the towing tank and basin of Shanghai Ship and Shipping Research Institute. During the experimental investigation, the articulated pusher barge vessel was divided into three parts: the pusher, the barge and the articulated pusher barge system. Firstly, the deep water resistance performance of the articulated pusher barge system, barge and the pusher at design draught T was studied, then the water depth h was adjusted, and the shallow water resistance at h/T = 2.0, 1.5 and 1.2 was tested and studied respectively, and the difference between deep water resistance and shallow water resistance at design draught were compared. The results of model tests and analysis show that: 1) in the study of deep water resistance, the total resistance of the barge was larger than that of the articulated pusher barge system. 2) for the barge, the shallow water resistance increases about 0.4–0.7 times at h/T = 2.0, 0.5–1.1 times at h/T = 1.5, and 0.7–2.3 times at h/T = 1.2. 3) for the pusher, the shallow water resistance increases about 1.0–0.4 times at h/T = 2.7, 1.2–0.9 times at h/T = 2.0, and 1.7–2.4 times at h/T = 1.6. 4) for the articulated pusher barge system, the shallow water resistance increases about 0.2–0.3 times at h/T = 2.0, 0.5–1.3 times at h/T = 1.5, and 1.0–3.5 times at h/T = 1.2. Furthermore, the water depth Froude number Frh in shallow water was compared with the changing trend of resistance in shallow water.

Stability of offshore structures in shallow water depth

2011 ◽  
Vol 2 (2) ◽  
pp. 320-333
Author(s):  
F. Van den Abeele ◽  
J. Vande Voorde
Keyword(s):  
Shallow Water ◽  
Water Depth ◽  
Fossil Fuels ◽  
Oil And Gas ◽  
Structural Response ◽  
Offshore Structures ◽  
Exploration And Production ◽  
Subsea Pipelines ◽  
Wave Induced ◽  
Shallow Water Depth

The worldwide demand for energy, and in particular fossil fuels, keeps pushing the boundaries of offshoreengineering. Oil and gas majors are conducting their exploration and production activities in remotelocations and water depths exceeding 3000 meters. Such challenging conditions call for enhancedengineering techniques to cope with the risks of collapse, fatigue and pressure containment.On the other hand, offshore structures in shallow water depth (up to 100 meter) require a different anddedicated approach. Such structures are less prone to unstable collapse, but are often subjected to higherflow velocities, induced by both tides and waves. In this paper, numerical tools and utilities to study thestability of offshore structures in shallow water depth are reviewed, and three case studies are provided.First, the Coupled Eulerian Lagrangian (CEL) approach is demonstrated to combine the effects of fluid flowon the structural response of offshore structures. This approach is used to predict fluid flow aroundsubmersible platforms and jack-up rigs.Then, a Computational Fluid Dynamics (CFD) analysis is performed to calculate the turbulent Von Karmanstreet in the wake of subsea structures. At higher Reynolds numbers, this turbulent flow can give rise tovortex shedding and hence cyclic loading. Fluid structure interaction is applied to investigate the dynamicsof submarine risers, and evaluate the susceptibility of vortex induced vibrations.As a third case study, a hydrodynamic analysis is conducted to assess the combined effects of steadycurrent and oscillatory wave-induced flow on submerged structures. At the end of this paper, such ananalysis is performed to calculate drag, lift and inertia forces on partially buried subsea pipelines.

Experimental Investigation of Trimaran Models in Shallow Water

2014 ◽  
Vol 30 (02) ◽  
pp. 66-78
Author(s):  
Mark Pavkov ◽  
Morabito Morabitob
Keyword(s):  
Shallow Water ◽  
Water Depth ◽  
Critical Speed ◽  
Water Effect ◽  
Finite Water Depth ◽  
Speed Regime ◽  
Displacement Speed ◽  
Littoral Combat Ship ◽  
Shallow Water Effect ◽  
The U.S

Experiments were conducted at the U.S. Naval Academy's Hydromechanics Laboratory to determine the effect of finite water depth on the resistance, heave, and trim of two different trimaran models. The models were tested at the same length to water depth ratios over a range of Froude numbers in the displacement speed regime. The models were also towed in deep water for comparison. Additionally, the side hulls were adjusted to two different longitudinal positions to investigate possible differences resulting from position. Near critical speed, a large increase in resistance and sinkage was observed, consistent with observations of conventional displacement hulls. The data from the two models are scaled up to a notional 125-m length to illustrate the effects that would be observed for actual ships similar in size to the U.S. Navy's Independence Class Littoral Combat Ship. Faired plots are developed to allow for rapid estimation of shallow water effect on trimaran resistance and under keel clearance. An example is provided.

KEPEMILIKAN DAN PENGUASAAN OBJEK JAMINAN FIDUSIA APABILA TERJADI SENGKETA WANPRESTASI DALAM PERJANJIAN KREDIT

2020 ◽  
Vol 8 (1) ◽  
pp. 78
Author(s):  
Dija Hedistira ◽  
' Pujiyono
Keyword(s):  
Economic Benefits ◽  
Civil Code ◽  
The Other ◽  
Third Party ◽  
Analysis Method ◽  
The Law ◽  
The Right

<p>Abstract<br />This article aims to analyze the ownership and mastery of a fiduciary collateral object, in cases that often occur today, many disputes between creditors and debtors in fiduciary collateral agreements are caused because creditors assume that with executive rights as fiduciary recipients, the fiduciary collateral object legally owned by creditors and creditors the right to take and sell fiduciary collateral objects when the debtor defaults unilaterally, as well as the debtor who considers that the fiduciary collateral object is owned by him because the object is registered on his name, so that the debtor can use the object free as  giving to a third party or selling the object of fiduciary guarantee unilaterally. the author uses a normative <br />juridical approach, and deductive analysis method based on the Civil Code and fiduciary law applicable in Indonesia, Law No. 42 of 1999 concerning Fiduciary Guarantees. The conclusion of the discussion is the ownership of the object of the Fiduciary Guarantee is owned by the debtor in accordance with the Law, mastery of the object of collateral controlled by the debtor for economic benefits, the procedure of execution The object of Fiduciary Guarantee is carried out in accordance with the Fiduciary Guarantee Act, an alternative mediation in resolving the dispute. There needs to be clarity in the use of language in making a law, so as not to conflict with each other between Article one and the other Articles.<br />Keywords: Ownership; Mastery; Object of Fiduciary Guarantee; Debtor; Creditors.</p><p>Abstrak<br />Artikel ini bertujuan untuk menganalisis tentang kepemilikan dan penguasaan suatu objek jaminan fidusia, dalam kasus yang saat ini sering terjadi, banyak sengketa antara kreditur dan debitur dalam perjanjian jaminan fidusia disebabkan karena kreditur beranggapan bahwa dengan adanya hak eksekutorial sebagai penerima fidusia, maka objek jaminan fidusia tersebut secara sah dimiliki oleh kreditur dan kreditur berhak mengambil dan menjual objek jaminan fidusia saat debitur cidera janji<br />(wanprestasi) secara sepihak, begitupun dengan debitur yang menganggap bahwa objek jaminan fidusia tersebut dimiliki olehnya karena objek tersebut terdaftar atas namannya, sehingga debitur dapat mempergunakan objek tersebut secara bebas seperti menyerahkan kepada pihak ketiga atau menjual objek jaminan fidusia tersebut secara sepihak. penulis menggunakan pendekatan yuridis normatif, dan metode analisis deduktif yang didasarkan pada Kitab Undang-Undang Hukum Perdata<br />dan hukum jaminan fidusia yang berlaku di Indonesia, Undang-Undang No. 42 Tahun 1999 tentang Jaminan Fidusia. Kesimpulan pembahasan adalah Kepemilikan Objek Jaminan Fidusia dimiliki oleh debitur sesuai Undang-undang, penguasaan objek jaminan dikuasai debitur untuk manfaat ekonomis, prosedur eksekusi Objek Jaminan Fidusia dilakukan sesuai dengan Undang-Undang Jaminan Fidusia, alternatif secara mediasi dalam menyelesaikan sengketa yang terjadi. Perlu ada kejelasan dalam<br />penggunaan bahasa pada pembuatan suatu Undang-Undang, agar tidak saling bertentangan antar Pasal satu dengan Pasal yang lainnya. <br />Kata Kunci: Kepemilikan; Penguasaan; Objek Jaminan Fidusia; Debitur; Kreditur.</p>

Is predation intensity reduced with increasing depth? Evidence from the west Atlantic stalked crinoidEndoxocrinus parrae(Gervais) and implications for the Mesozoic marine revolution

Paleobiology ◽  
1996 ◽  
Vol 22 (3) ◽  
pp. 339-351 ◽  
Author(s):  
Tatsuo Oji
Keyword(s):  
Shallow Water ◽  
The Other ◽  
The West ◽  
Bathymetric Range ◽  
Late Mesozoic ◽  
Predation Intensity ◽  
Stalked Crinoids ◽  
The Caribbean ◽  
Mesozoic Marine Revolution ◽  
Sublethal Predation

The number of regenerated arms was counted on specimens of two distinct phenotypes of the stalked crinoidEndoxocrinus parrae(Gervais) from a wide bathymetric range in the Caribbean (178-723 m). In one phenotype, the sample was divided into two groups, one from shallower (< 500 m) depths, the other from deeper (≥ 500 m); in the other phenotype the group divided at 550 m. In both phenotypes, the frequency of regenerated arms is significantly higher in specimens from shallower water than in those from deeper water. If the regenerated arms inEndoxocrinus parraewere the result of sublethal predation, as previously suggested, then predation intensity is higher in shallow water than deep water. These results are consistent with the idea of the late Mesozoic marine revolution—that there has been stronger predation on various invertebrates in shallow-water environments since the late Mesozoic. The stalked crinoids may have been unable to cope with increased predation in shelf environments, and they migrated to offshore environments.

XXI.—The Swimming and Burrowing Habits of the Amphipod Urothoë marina (Bate)

1940 ◽  
Vol 60 (3) ◽  
pp. 271-280 ◽  
Author(s):  
E. Emrys Watkin
Keyword(s):  
Shallow Water ◽  
The Other ◽  
British Isles ◽  
The Family ◽  
Southern Species

The intertidal and shallow-water sands of the coasts of the British Isles contain, in many cases as the dominant amphipod fauna, species of the three genera Haustorius, Urothoë, and Bathyporeia of the family Haustoriidæ, often coexistent in the same habitat and obtainable in the same samples. The swimming and burrowing mechanisms of Haustorius arenarius have been described by Dennell (1933), and I have described (1939) the mechanisms in some species of the genus Bathyporeia. This paper deals mainly with Urothoë marina; no reference is made to the other species of the genus, although U. brevicornis has been examined and found to be similar to U. marina. Since all species of the genus Urothoë are very similar morphologically and live in similar habitats, it may be assumed that the following description of U. marina will apply to them also, but I have had no opportunity of examining the more southern species U. grimaldii or U. pulchella. Crawford (1937) states that the burrowing habits of U. brevicornis and U. grimaldii var. poseidonis are very similar to those of Haustorius.

scholarly journals ADDED MASSES OF LARGE TANKERS BERTHING TO DOLPHINS

1976 ◽  
Vol 1 (15) ◽  
pp. 161 ◽  
Author(s):  
Taizo Hayashi ◽  
Masujiro Shirai
Keyword(s):  
Shallow Water ◽  
Froude Number ◽  
Water Depth ◽  
Head Loss ◽  
Theoretical Formula ◽  
Counter Flow ◽  
Added Masses ◽  
Mass Factor ◽  
Large Vessels ◽  
Good Agreement

The added masses of large tankers berthing to dolphins are studied both theoretically and experimentally. The movements of large vessels in shallow water in the directions normal to their planes of symmetry cause counterflows of appreciable velocities under the hulls. The inertia of these counter-flows is shown to have an important effect on the added masses of the vessels. A theoretical formula is derived to determine the mass factor of an ocean vessel in shallow water as a function of the ratio Draught/Water- depth, the Froude number of the vessel and the coefficient of head loss of the counter-flow under the hull. Experiment is made to determine the mass factor. Comparison:, between the theory and the experiment shows a good agreement.

Validation of Wave Propagation in Numerical Wave Tanks

2005 ◽  
Author(s):  
Tim Bunnik ◽  
Rene´ Huijsmans
Keyword(s):  
Shallow Water ◽  
Model Test ◽  
Water Depth ◽  
Linear Potential ◽  
Intermediate Water ◽  
Numerical Wave Tank ◽  
Wave Tank ◽  
Type Wave ◽  
Wave Generator ◽  
Numerical Wave

During the last few years there has been a strong growth in the availability and capabilities of numerical wave tanks. In order to assess the accuracy of such methods, a validation study was carried out. The study focuses on two types of numerical wave tanks: 1. A numerical wave tank based a non-linear potential flow algorithm. 2. A numerical wave tank based on a Volume of Fluid algorithm. The first algorithm uses a structured grid with triangular elements and a surface tracking technique. The second algorithm uses a structured, Cartesian grid and a surface capturing technique. Validation material is available by means of waves measured at multiple locations in two different model test basins. The first method is capable of generating waves up to the break limit. Wave absorption is therefore modeled by means of a numerical beach and not by mean of the parabolic beach that is used in the model basin. The second method is capable of modeling wave breaking. Therefore, the parabolic beach in the model test basin can be modeled and has also been included. Energy dissipation therefore takes place according to physics which are more related to the situation in the model test basin. Three types of waves are generated in the model test basin and in the numerical wave tanks. All these waves are generated on basin scale. The following waves are considered: 1. A scaled 100-year North-Sea wave (Hs = 0.24 meters, Tp = 2.0 seconds) in deep water (5 meters). 2. A scaled operational wave (Hs = 0.086 meters, Tp = 1.69 seconds) at intermediate water depth (0.86 meters) generated by a flap-type wave generator. 3. A scaled operational wave (Hs = 0.046 meters, Tp = 1.2 seconds) in shallow water (0.35 meters) generated by a piston-type wave generator. The waves are generated by means of a flap or piston-type wave generator. The motions of the wave generator in the simulations (either rotational or translational) are identical to the motions in the model test basin. Furthermore, in the simulations with intermediate water depth, the non-flat contour of the basin bottom (ramp) is accurately modeled. A comparison is made between the measured and computed wave elevation at several locations in the basin. The comparison focuses on: 1. Reflection characteristics of the model test basin and the numerical wave tanks. 2. The accuracy in the prediction of steep waves. 3. Second order effects like set-down in intermediate and shallow water depth. Furthermore, a convergence study is presented to check the grid independence of the wave tank predictions.

scholarly journals KONTRAKT SPÓŁKI JAKO PODSTAWA ODPOWIEDZIALNOŚCI IN SOLIDUM W PRAWIE RZYMSKIM

2017 ◽  
Vol 3 (1) ◽  
pp. 43
Author(s):  
Zuzanna Służewska
Keyword(s):  
Civil Law ◽  
Third Parties ◽  
The Other ◽  
Third Party ◽  
Roman Law ◽  
Joint And Several Liability ◽  
Internal Relation ◽  
Common Opinion ◽  
Formal Procedure ◽  
The Common

THE CONTRACT OF PARTNERSHIP AS A BASE OF IN SOLIDUM LIABILITY IN ROMAN LAWSummary In the modern civil law joint and several liability of partners in a partnership is a rule rather than an exception. According to the common opinion this concept did not originate in the Roman law but was first invented in the medieval times by glossators and commentators. The Roman partnership created only a private relation between partners (who, due to a conclusion of that contract were reciprocally obliged to act together in accordance with a good faith in order to conduct common business and to divide profits and bear losses in proportion to their respective shares) and its conclusion did not affect their liability against third parties. The partners had no right to bind themselves contractually to any third parties, unless they all acted jointly (in this case, however, their joint representation was derived from their expressed declarations and not the existence of a contract o f partnership). Thus, any commitment made by an individual partner, even if made within the scope of a partnership having obtained other partners’ consent, was treated as a personal debt of this partner and the remaining partners were not liable against his contractor. Then, of course, the partner who made a commitment (acting within the partnership’s business) could claim a part of what he had paid to a third party from other partners in proportion to their respective shares in the common enterprise.Such a solution was necessary because of the purely consensual character o f the Roman partnership and the lack of any formal procedure of its conclusion and dissolution. The existence of that contract could not affect the model of the external liability of partners, because it would be too risky for third parties, which had no possibility to make sure if a contract of partnership between some persons had been actually concluded or not. Thus, the role of a contract of partnership in the Roman law was only limited to determine a mutual liability o f partners, to specify their respective rights and obligations and to define the scope of their liability against other partners.There are only a few written sources concerning so called specific kinds of partnership characterized by untypical joint and several responsibility of partners. Moreover these texts are not very clear and are difficult to interpret, so the issue of specific kinds of a partnership is a matter of doubts among Romanists. Some authors even believe that the specific types of partnership did not exist in the Roman law at all.It should be firstly observed that the texts regarding a contract of partnership itself (the texts included in the title pro socio of Justinian’ Digest) did not raise the question of the external liability of partners because they were devoted to internal settlement o f accounts within sociu Thus, taking into account only these texts one cannot ascertain that a conclusion of a contract of partnership could not affect in any way the model of the partners’ liability against third parties.Secondly, the other texts concerning the regulation of conducting an economic activity in the Roman law (actio institoria, actio exercitoria and actio de peculio) present some regularity in an introduction of joint and several liability of debtors.On the one hand that model of the liability was introduced in situations in which protecting safety of trade required that the creditor be able to claim a whole amount o f the debt from one person only.On the other hand this model of liability could be introduced only in these cases in which some internal relation existed between several debtors. On the grounds of such relations the debtor who satisfied in full the creditor’s claim could sue other debtors in order to recover their respective parts in the debt. In the Roman law that internal relation that guaranteed the possibility of a recourse could be either a joint-ownership or a partnership.Having considered that, one may say that the texts concerning specific kinds o f partnership do not prove existence of any special type of societas. These sources regard only the situations when a joint and several liability between several debtors was introduced because it was justified by the circumstances: that is the necessity to protect the safety of trade on one hand and the existence of the contract of partnership that guaranteed a possibility to realize the recourse, on the other.In conclusion one may say that although a closing of a contract of partnership did not create a joint and several liability of partners, in some cases its existence was decisive for introducing this model of liability since it guaranteed to every party a possibility to act against the others to obtain the recourse. Thus, Roman jurisprudence made an important step towards the future introduction o f joint and several liability of partners as a rule of a civil law.

scholarly journals Public Private Partnerships and the Prospects for Sustainable ICT Projects in the Developing World

2007 ◽  
Vol 2 (3) ◽  
Author(s):  
Elizabeth Fife ◽  
Laura Hosman
Keyword(s):  
Case Studies ◽  
Success Factors ◽  
Public Services ◽  
Developing World ◽  
The Other ◽  
Third Party ◽  
Non Profit ◽  
Current State ◽  
The One

This paper analyses the recent phenomenon of private/public partnerships (PPPs) in the ICT sector of the developing world. The partners may come to these projects with divergent motivations: profit on the one hand and the provision of public services on the other, but at the end of the day, the interests of the partners that are symbiotic can – and indeed should – be aligned to ensure successful long-term projects. To investigate what can be done to promote successful and sustainable PPPs, this paper extends the traditional two-actor analysis to include both a third-party non-profit-oriented facilitating organization and the technology recipients that are the targets of these projects. Following an overview of the current state of PPPs in the developing world, the paper provides two case studies, based in Vietnam, where all four of the above-mentioned stakeholders were involved. The cases reveal important success factors that can be applied to future PPPs in the ICT sector.

Sign in / Sign up

Export Citation Format

Share Document