Gas-Lift Nodal Analysis Model - Economical Optimization Approach

2014 ◽  
Author(s):  
Mustafa Al-Lawati
Keyword(s):  
Optimization Approach ◽  
Analysis Model ◽  
Nodal Analysis ◽  
Economical Optimization ◽  
Gas Lift

Lessons Learnt from Integrated Production Modelling and Performance Analysis of Gas Lift Wells of One of the Biggest Offshore Complexes in India

2021 ◽  
Author(s):  
Sagun Devshali ◽  
Ravi Raman ◽  
Sanjay Kumar Malhotra ◽  
Mahendra Prasad Yadav ◽  
Rishabh Uniyal
Keyword(s):  
Performance Analysis ◽  
Flow Line ◽  
Gas Injection ◽  
Injection Rate ◽  
Oil Wells ◽  
Nodal Analysis ◽  
Integrated Production ◽  
And Performance ◽  
Gas Lift ◽  
Production Modelling

Abstract The paper aims to discuss various issues pertaining to gas lift system and instabilities in low producer wells along with the necessary measures for addressing those issues. The effect of various parameters such as tubing size, gas injection rate, multi-porting and gas lift valve port diameter on the performance analysis of integrated gas lift system along with the flow stability have been discussed in the paper. Field X is one of the matured offshore fields in India which has been producing for over 40 years. It is a multi-pay, heterogeneous and complex reservoir. The field is producing through six Process Complexes and more than 90% of the wells are operating on gas lift. As most of the producing wells in the field are operating on gas lift, continuous performance analysis of gas lift to optimize production is imperative to enhance or sustain production. 121 Oil wells and 7 Gas wells are producing through 18 Wellhead platforms to complex X1 of the field X. Out of these 121 oil wells, 5 are producing on self and remaining 116 with gas lift. In this paper, performance analysis of these 116 flowing gas lift wells, carried out to identify various problems which leads to sub-optimal production such as inadequate gas injection, multi-porting, CV choking, faulty GLVs etc. has been discussed. On the basis of simulation studies and analysis of findings, requisite optimization/ intervention measures proposed to improve performance of the wells have been brought out in the paper. The recommended measures predicted the liquid gain of about 1570 barrels per day (518 barrels of oil per day) and an injection gas savings in the region of about 28 million SCFD. Further, the nodal analysis carried out indicates that the aforementioned gas injection saving of 28 million SCFD would facilitate in minimizing the back pressure in the flow line network and is likely to result in an additional production gain of 350 barrels of liquid per day (65 barrels of oil per day) which adds up to a total gain of 1920 barrels of liquid per day (583 barrels of oil per day). Additionally, system/ nodal analysis has also been carried out for optimal gas allocation in the field through Integrated Production Modelling. The analysis brings out a reduction in gas injection by 46 million SCFD with likely incremental oil gain of ~100 barrels of oil per day.

Optimal Offloading Configuration of Spread-Moored FPSOs

2009 ◽  
Vol 131 (2) ◽  
Author(s):  
Steven M. Wilkerson ◽  
Satish Nagarajaiah
Keyword(s):  
Environmental Conditions ◽  
Main Tool ◽  
Design Parameters ◽  
Optimization Approach ◽  
Analysis Model ◽  
Simple Analysis ◽  
Formal Approach ◽  
Fine Tune ◽  
Formal Optimization ◽  
Selection Of

As the oil offloading operations of floating production storage and offloading (FPSO) units become more routine, the desire grows to increase the availability for offloading and thus decrease production downtime. Experience with these operations is the main tool available to increase the efficiency of this aspect of deepwater production. However, it is clear that a formal optimization approach can help to fine tune design parameters so that not only is availability increased but the significance of each design parameter can be better understood. The key issue is to define the environmental conditions under which the vessels involved in offloading are able to maintain position. By this, we reduce the notion of availability to a set of operating criteria, which can or cannot be met for a particular set of environmental conditions. The actual operating criteria such as relative vessel heading depend on selection of design parameters, such as the direction and magnitude of external force applied by thrusters or tugs. In the earliest offloading operations, engineering judgment was used to determine the feasibility of offloading at a particular time. For example, if wind and current were not expected to exceed a 1year return period, offloading may be considered safe. This approach can be both conservative and unconservative, depending on the nuances of the particular environmental conditions. This study will propose a formal approach to choosing the design parameters that optimize the availability of a FPSO for offloading. A simple analysis model will be employed so that optimization can be performed quickly using a robust second order method. The proposed analysis model will be compared to model test data to demonstrate its agreement with the more complex system.

A nodal analysis model for the out-of-plane beamshape electrothermal microactuator

2008 ◽  
Vol 15 (2) ◽  
pp. 217-225 ◽  
Author(s):  
Rengang Li ◽  
Qing-An Huang ◽  
Weihua Li
Keyword(s):  
Analysis Model ◽  
Nodal Analysis ◽  
Out Of Plane

scholarly journals Optimasi Sumur Gas Lift XX dengan Nodal Analysis di PT Pertamina EP ASSET 2 Field Prabumulih

2020 ◽  
Vol 10 (1) ◽  
pp. 31-38
Author(s):  
Faazir Aal Dito Maulana ◽  
Keyword(s):  
Check Valve ◽  
Nodal Analysis ◽  
Gas Lift

Sumur XX merupakan salah satu sumur minyak di Lapangan Prabumulih yang berproduksi secara sembur buatan (continuous gas lift). Saat ini, sumur XX berproduksi pada laju alir 775 blpd, laju alir gas injeksi sebesar 0.3 mmscfd, tekanan kick off sebesar 560 psi tekanan surface operation sebesar 460 psi, tekanan resevoir 2200 psi, GLR formasi 193 scf/bbls dan 95% watercut. Dari hasil analisis nodal, didapatkan laju alir optimum sumur sebesar 895 blpd pada laju alir gas injeksi sebesar 1. mmscfd. Penentuan gas lift spacing di dapat 6 valve yaitu 5 unloading valve dan 1 check valve dengan ukuran port 16/64 inch.

Nodal Analysis for SAGD Production Wells with Gas Lift

2015 ◽  
Author(s):  
Grant J. Duncan ◽  
Scott A. Young ◽  
Phillip E. Moseley
Keyword(s):  
Nodal Analysis ◽  
Production Wells ◽  
Gas Lift

Thermal and economical optimization for a finned-tube, air-cooled condenser design of a roof-top bus air-conditioning system

2007 ◽  
Vol 221 (11) ◽  
pp. 1363-1375 ◽  
Author(s):  
M Khamis Mansour ◽  
M N Musa ◽  
M N Wan Hassan
Keyword(s):  
Air Conditioning ◽  
Optimization Technique ◽  
Finned Tube ◽  
Frontal Area ◽  
Coefficient Of Performance ◽  
Design Parameters ◽  
Optimization Approach ◽  
Air Conditioning System ◽  
Economical Optimization ◽  
Tube Condenser

The current paper presents a methodology of a design optimization technique that can be useful in assessing the best configuration of a finned-tube condenser, using a thermal and economical optimization approach. The assessment has been carried out on an air-cooled finned-tube condenser of a vapour compression cycle for a roof-top bus air-conditioning system at a specified cooling capacity. The methodology has been conducted by studying the effect of some operational and geometrical design parameters for the condenser on the entire cycle exergy destruction or irreversibility, air-conditioning system coefficient of performance (COP), and total annual cost. The heat exchangers for the bus air-conditioning system are featured by a very compact frontal area due to the stringent space limitations and structure standard for the system installation. Therefore, the current study also takes in its account the effect of the varying design parameters on the condenser frontal area. The irreversibility due to heat transfer across the stream-to-stream temperature-difference and due to frictional pressure-drops is calculated as a function of the design parameters. A cost function is introduced, defined as the sum of two contributions, the investment expense of the condenser material and the system compressor, and the operational expense of air-conditioning system, which is usually driven by an auxiliary engine or coupled with the main bus engine. The optimal trade-off between investment and operating cost is therefore investigated. A numerical example is discussed, in which, a comparison between the commercial condenser design and optimal design configuration has been presented in terms of the system COP and condenser material cost. The results show that a significant improvement can be obtained for the optimal condenser design compared to that of the commercial finned-tube condenser, which is designed based on the conventional values of the design parameters.

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