scholarly journals Downhole Pressure Controlled Plunger Gas Lift Research and Application in Block Su75 of Sulige Gas Field

2016 ◽  
Author(s):  
Lina Wang ◽  
Gang Cheng ◽  
Lianchi Ye ◽  
Yongxiang Yang ◽  
Xiaofeng Xu ◽  
...  
Keyword(s):  
Gas Field ◽  
Gas Lift ◽  
Pressure Controlled

scholarly journals A new experimental method to prevent paraffin - wax formation on the crude oil wells: A field case study in Libya

2015 ◽  
Vol 69 (3) ◽  
pp. 269-274 ◽  
Author(s):  
Elnori Elhaddad ◽  
Alireza Bahadori ◽  
Manar Abdel-Raouf ◽  
Salaheldin Elkatatny
Keyword(s):  
Pour Point ◽  
Oil Wells ◽  
Fluid Temperature ◽  
Gas Field ◽  
Ethylene Copolymers ◽  
Comb Polymers ◽  
Point Temperature ◽  
Temperature Range ◽  
Gas Lift

Wax formation and deposition is one of the most common problems in oil producing wells. This problem occurs as a result of the reduction of the produced fluid temperature below the wax appearance temperature (range between 46?C and 50?C) and the pour point temperature (range between 42?C and 44?C). In this study, two new methods for preventing wax formation were implemented on three oil wells in Libya, where the surface temperature is, normally, 29?C. In the first method, the gas was injected at a pressure of 83.3 bar and a temperature of 65?C (greater than the pour point temperature) during the gas-lift operation. In the second method, wax inhibitors (Trichloroethylene-xylene (TEX), Ethylene copolymers, and Comb polymers) were injected down the casings together with the gas. Field observations confirmed that by applying these techniques, the production string was kept clean and no wax was formed. The obtained results show that the wax formation could be prevented by both methods.

Software Simulation for Making Severe Slugging Control Strategy in Deepwater Riser

2014 ◽  
Author(s):  
Bing Cheng ◽  
Qingping Li ◽  
Xichong Yu ◽  
Haiyuan Yao
Keyword(s):  
Control Strategy ◽  
Oil And Gas ◽  
Hydrate Formation ◽  
Flow Assurance ◽  
Fluid Composition ◽  
Gas Field ◽  
Software Simulation ◽  
Oil And Gas Field ◽  
Deepwater Riser ◽  
Gas Lift

As one aspect of flow assurance considerations, severe slugging control strategy in deepwater riser is related to the safety of production system, therefore it’s of great significance to the development of deepwater oil and gas field. This paper summarizes commonly used severe slugging control methods briefly, then takes certain deepwater oil and gas field as an example to introduce the method of software simulation for making severe slugging control strategy of deepwater riser. Firstly the model is built with basic information such as pipeline route, production profile and fluid composition. Data of typical years is used to simulate flowing conditions to determine whether it’s within slugging zone. To mitigate slugging conditions, choking, gas lift and choking& gas lift combined methods are chosen and simulated based on the oil and gas field characteristics, and according to the results gas lift is suggested as the best solution. Factors such as riser type, gas injection location, and flexible riser depth are analyzed for better gas lift efficiency. Finally hydrate formation risk related to severe slugging is analyzed and the slug catcher size is checked. Based on the introduced software simulation procedure, severe slugging control strategy is made, which will be valuable for deepwater flow assurance design and study.

Successful Improvement of Ultimate Recovery of Complex Deep Tight Gas Field via Combined Gas Lift De-Liquification Techniques

2021 ◽  
Author(s):  
Haitham.H Al Masroori ◽  
Abdullah.S. Al-Shuely ◽  
Nabil.S. Al-Siyabi ◽  
Salim.K. Al-Subhi ◽  
Dawood.N. Al Kharusi ◽  
...  
Keyword(s):  
Extensive Study ◽  
Significant Loss ◽  
Dew Point ◽  
Well Bore ◽  
Liquid Loading ◽  
Gas Field ◽  
Entire Area ◽  
Surface Development ◽  
Static Head ◽  
Gas Lift

Abstract The Amin top structure is Well defined in seismic data and can be easily interpreted across the entire area of North Oman. It is being identified as an extremely tight, disconnected, low porosity, low permeability, and HPHT reservoir, and thus presents unique challenges to harness its full production potential. Approximately, 15 years after production began with significant pressure depletion below dew point, a significant loss in Well productivity occurred in some of the Wells. Furthermore, during shutdowns or sudden trips of production stations, more Wells faced difficulties to restart again due to mainly, condensate banking and other probable reasons like formation water cross-flow during shut-in, which created a water bank and impaired inflow performance liquid loading due to low Well bore pressure which caused higher static head at the Well tubing. Common practice of N2 lifting CTU becoming no economical with increase number of Wells suffer from Liquid loading and represented a major challenge to look for cheaper economic alternatives. To reduce the higher OPEX associated with nitrogen lifting of Wells, multiple options were considered and evaluated thoroughly including extensive study of several artificial lift methods which were thought to defer liquid loading and mitigate kick-off issues such as Foam lift, Plunger lift, Beam Pump, ESP, Jet Pump and Gas lift (Concentric gas lift). The optimum gas Well de-liquification method has been identified based on the highest UR considering connected GIIP and inflow resistance A (Forchheimer equation Laminar flow). The outcome of the study indicated that a gas lift technology combined with well retubing was recommended as the optimum solution. The injected gas has reduced the density of the liquid resulting in reducing the static head at the tubing which increased the Well bore pressure allowing the Well to flow. A successful robust pilot which has been completed in two Wells and gave conclusive results. The surface development concept encompasses the development, with long term testing. The outstanding successful outcomes of the pilot succeeding in restoring Wells back with economic prolific production rates have led to expedite a full field implementation plan in three fields covering (33 Wells) in the next 5 years. These Wells have similar sub-surface and surface conditions. This paper will highlight the full story of the Gas lift technology implementation and describe in details the entire process starting from the Well candidate selection screening criteria, concept detailed design, critical success factors, project assurances and controls, Injection rate and operating parameters, facility capex, life time cycle and the result tested gas & condensate and water production. Also, the learning and challenges like halite accumulation effects will be shared along with the proven practical mitigation plan that ensured and sustained Well production resulting to significant project success of the technology.

Research on Intelligent Production Technology of Intermittent Gas Wells in Sulige Gas Field

2021 ◽  
Author(s):  
Yong Chen ◽  
Yonggang Xie ◽  
Wei Tian ◽  
Xiongxiong Wang ◽  
Zhengyan Zhao ◽  
...  
Keyword(s):  
Production Technology ◽  
Production Management ◽  
Gas Wells ◽  
Gas Field ◽  
Gas Well ◽  
Production Management System ◽  
Different Types ◽  
Intelligent Management ◽  
Intelligent Methods ◽  
Pressure Controlled

Abstract An intermittent gas well intelligent production technology is presented that use intelligent methods to determine and optimize the intermittent system of intermittent gas wells and use newly developed remote pressure-controlled well opening equipment that can simulate manual operations and corresponding intelligent control systems. This new approach is based on the research and application of intelligent technology in the production of intermittent gas wells. By establishing the models of gas flow in different types of gas wells, combined with the historical data of typical gas wells, the optimal pen and shut-in well time chart is finally formed. A series of remote pressure-controlled well opening equipment have been developed to replace manual pressure-controlled open well operations at the well site. Through intelligent integration of well site equipment and remote control platforms, an ntermittent gas well intelligent production management system is established. The quantitative determination of the intermittent system of different types of gas wells is realized. The effectiveness of gas well intermittent measures has increased from 72% to 90%. Electromagnetic remote-controlled open well equipment with adaptive decompression and full-open cylinder structure is developed, and can meet the requirements for rapid opening of type Il intermittent gas wells. Needle-valve type remote-controlled open well equipment embedded with intelligent well drilling algorithm is developed, and the fine well opening of class I and Il intermittent gas wells is realized. Hands-free operation is realized, and the workload of operating staff on the well site is reduced by more than 15%. On-site diagnosis of gas well production status, intelligent generation of systems, intelligent analysis and optimization are realized, and intermittent gas wells are transformed from manual management to intelligent management. An intermittent gas well intelligent production management system is established to achieve intelligent management of intermittent gas wells. Complete intermittent gas well intelligent production technology for low ermeability gas fields is described in detail to permit global similar gas field reference. The novelty of the technology lies in the use of intelligent methods to solve the production problems of intermittent gas wells, including reducing the labor intensity ofemployees, improving production efficiency, improving the fine management level of tight gas field gas wells, and reducing the impact of human activities on the natural environment.

Benefits of pressure-controlled hemostasis for transradial vascular access: a randomized controlled trial

2020 ◽  
Vol 68 (1) ◽  
Author(s):  
Ki-Sul Chang ◽  
Byung-Sik Kim ◽  
Jinho Shin ◽  
Young-Hyo Lim ◽  
Jeong-Hun Shin ◽  
...  
Keyword(s):  
Randomized Controlled Trial ◽  
Vascular Access ◽  
Controlled Trial ◽  
Randomized Controlled ◽  
Pressure Controlled
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