Restriction of Water Production in Gas Wells by Induced Phase Inversion: Field Case Studies

Lakatos, István; Lakatos-Szabó, J.; Szentes, G.; Vágó, Árpád

doi:10.2118/168189-ms

Cited by 4 publications

(4 citation statements)

References 19 publications

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“…In such cases, a more logical decision may be to implement one of the possible methods of improving exploitation efficiency, i.e., the implementation of technologies aimed at the immediate vicinity of production or injection wells, as WSO technologies are. Technologies of this type, including the innovative RCC technology, have been successfully used in Hungary [8,10]. The first treatments performed will provide an answer to the effectiveness of this type of treatment in the Polish part of the Carpathian Foredeep.…”

Section: Discussionmentioning

confidence: 99%

“…In recent years, interesting concepts of using working fluids based on microemulsions in WSO treatments have appeared [9]. Hungarian specialists developed an innovative method, classified as reservoir conformance control (RCC) technology, which was successfully implemented in 16 gas wells [8,10]. RCC technology differs significantly from RPM methods developed so far.…”

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confidence: 99%

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A New Strategy for Pre-Selecting Gas Wells for the Water Shut-Off Treatment Based on Geological Integrated Data

et al. 2021

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This article presents a new analytical procedure for pre-selecting gas wells for water shut-off treatments based on available at hand results of an analysis of integrated geological, reservoir and exploitation data. Attention was paid to assess the possibility of the appearance of cross flows between layers in the near wellbore zone. Their appearance always eliminated the well as a candidate for the treatment. The basis for assessing the possibility of the emergence of cross flows was based on the assessment of the presence or absence of impermeable barriers (e.g., shales or anhydrite) in intervals, completed by perforation. For this assessment, well logging data were used, which were carried out in different years with the use of various types of probes. Based on modified quantitative and qualitative interpretation techniques, permeable and impermeable layers were separated in the analysed borehole sections. In some cases, in the absence of other data, well logs are the only source of information from which a vertical profile of horizontal permeability can be made. The article describes the verification process carried out for the eight wells situated in the area of the Carpathian Foredeep, which have been preselected by the operator. As part of this procedure, the available geological, reservoir and exploitation data were used, and a preliminary assessment of the possibility of implementing the obtained results into other wells and gas fields in the area of the Carpathian Foredeep was carried out. On the basis of the well ranking, two out of the eight analysed wells were recommended as candidates for water shut-off treatment.

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Section: Discussionmentioning

confidence: 99%

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confidence: 99%

A New Strategy for Pre-Selecting Gas Wells for the Water Shut-Off Treatment Based on Geological Integrated Data

et al. 2021

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“…The developed technology differs substantially from the RPM techniques, mainly in the assumption of a significantly more radical interference in the reservoir and the creation of gel-insulating barriers in the wellbore zone, with a larger reach and at greater depths. Such barriers, under their assumption, are to effectively restrict the water inflow to the well, to be more durable due to the nature of their formation and do not cause losses in the production of hydrocarbons (Lakatos et al, 2014;Lakatos et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

The modification of filtration properties of porous pedia using Multizol micellar treatment fluid

Majkrzak,

Falkowicz,

Stanik

2023

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The need for the modification of filtration properties of rock media (most frequently porous rocks) appears frequently, e.g., in hydrocarbon exploitation. Exploitation of crude oil and natural gas is frequently accompanied by an excessive and uncontrolled inflow of reservoir water to the production well, which often results in a significant reduction of hydrocarbon production in the late period of reservoir exploitation. The control of water inflow, through modification treatments of rock filtration properties of the near wellbore zone, is the solution to this problem. The use of dedicated treatment fluids is the basis of such success, which, after the injection and change of original physicochemical properties, create local insulation barriers, enabling the control of the flow of fluids in the geological formation. This paper presents the results of the laboratory assessment of the technological effectiveness of Multizol micellar treatment fluid, which is used for selective blocking of the reservoir water inflow to gas wells. Tests performed, at a preliminary stage, comprised the development of a procedure, the obtaining of samples of the treatment fluid, and the performance of flow tests in test glass tubes, which allow for a swift determination of the technological range of the fluid's capability to form gel and emulsion. Flood tests were the main element of testing, related to the measurement of pressure drops of fluids flowing through the sample under the simulated reservoir conditions. The tests were carried out using two types of media, porous rocks (Szydłowiec sandstone) and sand packs. The determination of the modification degree of filtration properties, both in individual zones and in the entire sample/model, was based on the value of the FRR (Residual Resistance Factor) coefficient, being the measure of their permeability reduction. Two types of tests were performed to assess the effect of Multizol treatment fluid on the initial filtration properties of gas and water-bearing zones.

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“…All reported methods were based, however, on use of macroemulsions having medium to high viscosity. Therefore, the primary aim of the recent research projects [7][8][9] was to develop similar chemical systems and testing the novel self-conforming technology under diverse reservoir conditions. Analyzing the possible mechanism of the so-called ЉmicroemulsionЉ methods discussed earlier in two papers [5][6] , it was recognized that the resistance exclusively developed against the water flow when the silicone microemulsions or ideal polysiloxane solutions were mixing with water and transformed to macroemulsion via phase inversion.…”

Section: Introductionmentioning

confidence: 99%

Multifunctional Stimulation of Gas Wells Operating in Gas Cap over a Depleted Oil Reservoir

Lakatos

Lakatos-Szabo

Szentes

et al. 2016

SPE International Conference and Exhibition on Formation Damage Control

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The primary aim of the research project was to develop an efficient technology to control excessive water production in gas wells. As a novelty, water sensitive petroleum-based solutions were developed, which spontaneously form extremely high viscosity barrier under reservoir condition when contacting with water. The beneficial effects of induced phase inversion of metastable systems on restriction on water flow were already detailed in previous papers and later the technology was deemed matured and necessary to test under field conditions. Two phases and the still running field pilots were accomplished in one of the gas capped oil reservoirs of the largest stacked hydrocarbon field Algyö, Hungary. The target gas wells were operating in the gas cap over the oil layer depleted by double-sided water injection. Until now, six active wells were treated with the self-conforming microemulsions including two repeated cases.Analyzing the production history of wells, the detrimental (Ͼ50 m 3 /d, sometimes much higher than 100 m 3 /d) water production was the primary factor selecting the target wells to be treated. Usually, 40 -100 m 3 microemulsion was injected into the wells after drying the vicinity of wells by water-miscible organic solvent and N 2 injection. The post-injected inert gas also served to create deep penetration of the treating solution in the reservoir. The jobs were completed within 1-2 days, and after 2-3 weeks of shut-in period, the gas production was restarted. Evaluating the field results, it was concluded that the treatments prove a multifunctional mechanism. The water production in some wells dropped significantly (from 120 m 3 /d to 40 -30 m 3 /d in one well); meanwhile the gas production remained unchained. In one well, the water production remained unchained, however, the gas production tripled. Surprisingly, all treated wells, never producing liquid hydrocarbons in the earlier period, started to produce substantial amount of oil (oil cut between 10% and 75% oil in net fluid rate). These positive results can be attributed to three different reasons: effective barrier formation against water influx, reducing skin factor caused by formation damage, and opening new flow paths from entrapped oil bodies existing below the gas cap. Thus, the treatment technology was qualified as a Љmultifunctional well stimulationЉ in contrast to the original term of Љwater shutoffЉ method. Based on the encouraging field results the technology became one of the strategic projects of the company in the coming years until 2020.

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Restriction of Water Production in Gas Wells by Induced Phase Inversion: Field Case Studies

Cited by 4 publications

References 19 publications

A New Strategy for Pre-Selecting Gas Wells for the Water Shut-Off Treatment Based on Geological Integrated Data

A New Strategy for Pre-Selecting Gas Wells for the Water Shut-Off Treatment Based on Geological Integrated Data

The modification of filtration properties of porous pedia using Multizol micellar treatment fluid

Multifunctional Stimulation of Gas Wells Operating in Gas Cap over a Depleted Oil Reservoir

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