Productivity, Water Breakthrough And Ultimate Recovery In Horizontal Wells With A Range Of Completion Types

2003 ◽  
Author(s):  
Colin Jones ◽  
John Cameron ◽  
Eric MacKay
Keyword(s):  
Horizontal Wells ◽  
Water Breakthrough

scholarly journals Prediction of water breakthrough time in horizontal Wells in edge water condensate gas reservoirs

2020 ◽  
Vol 213 ◽  
pp. 02009
Author(s):  
Quan Hua Huang ◽  
Xing Yu Lin
Keyword(s):  
Horizontal Well ◽  
Negative Impact ◽  
Horizontal Wells ◽  
Breakthrough Time ◽  
Gas Reservoirs ◽  
Gas Reservoir ◽  
Water Breakthrough ◽  
Calculation Results ◽  
Seepage Model ◽  
Reasonable Prediction

Horizontal Wells are often used to develop condensate gas reservoirs. When there is edge water in the gas reservoir, it will have a negative impact on the production of natural gas. Therefore, reasonable prediction of its water breakthrough time is of great significance for the efficient development of condensate gas reservoirs.At present, the prediction model of water breakthrough time in horizontal Wells of condensate gas reservoir is not perfect, and there are mainly problems such as incomplete consideration of retrograde condensate pollution and inaccurate determination of horizontal well seepage model. Based on the ellipsoidal horizontal well seepage model, considering the advance of edge water to the bottom of the well and condensate oil to formation, the advance of edge water is divided into two processes. The time when the first water molecule reaches the bottom of the well when the edge water tongue enters is deduced, that is, the time of edge water breakthrough in condensate gas reservoir.The calculation results show that the relative error of water breakthrough time considering retrograde condensate pollution is less than that without consideration, with a higher accuracy. The example error is less than 2%, which can be effectively applied to the development of edge water gas reservoir.

An Innovative Acid Diversion Using In-Situ Foam Generation: Experimental and Successful Field Application

2021 ◽  
Author(s):  
Ayman Al-Nakhli ◽  
Mohannad Gizani ◽  
Abdualilah Baiz ◽  
Mohammed Yami
Keyword(s):  
Horizontal Wells ◽  
Field Application ◽  
Damage Potential ◽  
Left Behind ◽  
Foam Generation ◽  
Water Breakthrough ◽  
Acid Diversion ◽  
Well Injectivity ◽  
Pressure Resistance

Abstract In carbonate reservoirs, effective acid stimulation is essential to overcome reservoir damage and mainline high oil production. Recently, most of oil wells are being drilled horizontally to maximize production. Acid stimulation of horizontal wells with long intervals require very effective acid diversion system. If the diversion system is not efficient enough, most of the acid will be leaking-off near the casing shoe, in openhole well, which will result in a fast water breakthrough and diminish production. This study describes a breakthrough treatment for acidizing long horizontal wells in carbonate formations. The novel technology is based on in-situ foam generation to divert the acid. Gas diversion, as a foam, is a perfect diversion mechanism as gas creates pressure resistance which forces the acid stages to be diverted to new ones?. The diversion will not require the acid to be spent, compared to viscoelastic diverting system. Moreover, no gel is left behind post treatment, which will eliminate any damage potential. The system is not impacted with the presence of corrosion products, where diverting system will not function without effective pickling and tubular cleanup. Lab results showed that the new in-situ foam generation system was very effective on both dolomite and calcite cores. The system creates high back pressure when foam is generated, which significantly diverts the acid stages to stimulate other intervals. Moreover, the new system minimizes acid leak-off and penetration. Open completing the job, the foam collapse leaving no left behind any damaging material. Field application of the in-situ foam generating system showed high success rate and outperformed other diversion mechanisms. The well gain was up to 18 folds of the original well injectivity.

A Prediction of Water Breakthrough Time of Horizontal Wells in Gas Reservoirs with Bottom Water

2011 ◽  
Vol 201-203 ◽  
pp. 393-398
Author(s):  
Wei Yao Zhu ◽  
Xiao He Huang ◽  
Hong Qing Song ◽  
Jia Deng ◽  
Xuan Liu
Keyword(s):  
Bottom Water ◽  
Water Saturation ◽  
Horizontal Wells ◽  
Breakthrough Time ◽  
Gas Reservoirs ◽  
Gas Well ◽  
Porous Flow ◽  
Water Breakthrough ◽  
Irreducible Water Saturation

Based on the theory of porous flow, a study on prediction of water breakthrough time of horizontal wells in a homogeneous gas reservoir with bottom water is presented. This paper derives water breakthrough time formula of horizontal wells in a reservoir with bottom water drive. In the formula many factors are taken into account, such as height of water avoidance, gas-water mobility ratio, irreducible water saturation, residual gas saturation, etc. Case study indicates that for a horizontal gas well with constant production rate, the water breakthrough time is proportional to the height of water avoidance.

scholarly journals Water Breakthrough Shape Description of Horizontal Wells in Bottom-Water Reservoir

2014 ◽  
Vol 2014 ◽  
pp. 1-9
Author(s):  
Shijun Huang ◽  
Baoquan Zeng ◽  
Fenglan Zhao ◽  
Linsong Cheng ◽  
Baojian Du
Keyword(s):  
Physical Model ◽  
Horizontal Well ◽  
Bottom Water ◽  
Water Reservoir ◽  
Horizontal Wells ◽  
Analysis Model ◽  
Heterogeneous Reservoir ◽  
Water Breakthrough ◽  
Original Oil In Place ◽  
Water Cut

Horizontal wells have been applied in bottom-water reservoir since their advantages were found on distribution of linear dropdown near wellbore, higher critical production, and more OOIP (original oil in place) controlled. In the paper, one 3D visible physical model of horizontal physical model is designed and built to simulate the water cresting process during the horizontal well producing and find water breakthrough point in homogenous and heterogeneous reservoir with bottom water. Water cresting shape and water cut of horizontal well in between homogenous and heterogeneous reservoir are compared on the base of experiment’s result. The water cresting pattern of horizontal well in homogeneous reservoir can be summarized as “central breakthrough, lateral expansion, thorough flooding, and then flank uplifting.” Furthermore, a simple analysis model of horizontal well in bottom water reservoir is established and water breakthrough point is analyzed. It can be drawn from the analysis result that whether or not to consider the top and bottom border, breakthrough would be located in the middle of horizontal segment with equal flow velocity distribution.

Effect of 2-Phase Oil-Water Flow and Friction Pressure Loss in the Wellbore on Water Cresting in Horizontal Wells

2002 ◽  
Author(s):  
Solomon O. Inikori ◽  
Andrew K. Wojtanowicz
Keyword(s):  
Horizontal Well ◽  
Horizontal Wells ◽  
Published Data ◽  
Well Performance ◽  
Horizontal Pipe ◽  
The North ◽  
Water Breakthrough ◽  
Water Coning ◽  
Major Factors ◽  
Analytical Tools

Horizontal well application to mitigate water coning problems have gained wide industry acceptance. However, horizontal wells themselves have not been free from water coning (cresting) problems. A major challenge before industry operators is the effective modeling of water crest development in horizontal wells. More often, mathematical models developed for fluid flow in horizontal pipes have been adopted for modeling horizontal well performance but these have been largely inadequate. This paper presents a more encompassing tool for evaluating the performance of horizontal wells with bottom water drive which incorporates all the effects of perforations, 2-phase liquid-liquid flow and axial influx of fluid into the wellbore. A new value of equivalent pipe roughness function is developed for use in the numerical simulators to accommodate the inadequacies of the current commercial softwares. The empirical results using published data from the North Sea indicate a more practical representation of the phenomenon of water cresting in horizontal wells and the level of severity. Two major factors affected by the application of the new approach are; a reduction in the time to water breakthrough as previously predicted by analytical tools, and an effective representation of the geometry of water cresting in horizontal wells similar to field experiences. The paper also shows that direct application of horizontal pipe models in horizontal well is grossly inadequate. Finally it shows use of horizontal wells in the development of reservoirs underlain by water needs adequate evaluation.

Application of Horizontal Wells to Reduce Water Production during Gel Treatment

2013 ◽  
Vol 807-809 ◽  
pp. 2629-2633
Author(s):  
Guang Xi Shen ◽  
Ji Ho Lee ◽  
Kun Sang Lee
Keyword(s):  
Oil Recovery ◽  
Substantial Reduction ◽  
Cross Flow ◽  
Oil Production ◽  
Horizontal Wells ◽  
Water Production ◽  
Sweep Efficiency ◽  
Vertical Permeability ◽  
Water Breakthrough ◽  
Gel Treatment

It is well known that gel treatment has outstanding potential to delay water breakthrough and reduce water production. However, it causes the decrease of oil production by permeability reduction, even though it is not as much as reduction of water production. For this reason, to improve oil production with substantial reduction of water production, performances of gel treatments through the combination of horizontal and/or vertical wells were assessed and compared. An extensive numerical simulation was executed for four different well configurations under gel treatment associated with waterflood to accomplish the purpose of this study. Performances were compared according to cumulative oil recovery and water-oil ratio at the production well for different systems. Though all of well configurations considered in this study effectively decreased the water production compared with waterflood, applications of horizontal wells led to much higher oil recovery than vertical well because of improved sweep efficiency. Based on these results, the potential of horizontal wells was examined through different scenarios in combinations of injection and production wells. Furthermore, various well lengths of injectors or producers were assessed for horizontal wells. Because cross-flow between layers dominates performance of gel treatment, effects of vertical permeability were also investigated in application of gel treatment with horizontal well. Longer wells and higher cross-flow results in better performance. This study represents that effectiveness of horizontal wells for gel treatment even for reservoirs having dominant cross-flow.

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