First Results of Cyclic Steam Stimulations of Vertical Wells with Radial Horizontal Bores in Heavy Oil Carbonates (Russian)

Ursegov, Stanislav; Bazylev, Alexander; Taraskin, Evgeny

doi:10.2118/115125-ru

Cited by 20 publications

(13 citation statements)

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“…Bruni et al (2007) exhibited the Radial drilling technique in Argentina. Ursegov et al (2008) presented the first results of cyclic steam stimulations of vertical wells with radial horizontal bores in heavy oil carbonates, and the results validated the wide usability of radial drilling technique. And Abdel-Ghany et al (2011) stated the first radial drilling well conditions in Egypt.…”

Section: Introductionmentioning

confidence: 64%

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Optimizing the branch number and branch length of radial drilling in high water cut low permeability reservoirs

Wang

Cui

2015

J Petrol Explor Prod Technol

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Radial drilling, also called ultra-short horizontal well, is a new kind stimulation technology, which can be used both in new and old wells to improve the productivity and oil recovery effectively. For the low permeability reservoirs, it had been widely used in practice to effectively solve the unbalanced displacement problems for the waterflooded reservoirs. Applying the multi-layer equilibrium displacement principle, the model of optimizing the radial drilling branch number and length for the high water cut low permeability reservoirs is established, and the corresponding programs are also compiled. Using the reservoir numerical simulation technology, this model is proved to be valid and accurate. This optimization method has been applied in Bonan fifth reservoir of Shengli oilfield, which exhibits quite positive results: higher average production rate and lower average water cut of the radial drilled wells. Keywords Radial drilling Á High water cut Á Low permeability Á Equilibrium displacement Well radius r wh Radius of the lateral well S we Water saturation of the exit end S we The average water saturation when the exit end's water saturation is S we l Viscosity of the fluid l o Oil viscosity l w Water viscosity

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Section: Introductionmentioning

confidence: 64%

“…Dickinson et al (1992) presented two methods of combining water jet drilling and coiled tubing, and discussed their advantages and weaknesses in the practice. Yang et al (2006) introduced the technique status in China and its application situation in Liaohe oilfield. Bruni et al (2007) exhibited the Radial drilling technique in Argentina.…”

Section: Introductionmentioning

confidence: 99%

Optimizing the branch number and branch length of radial drilling in high water cut low permeability reservoirs

Wang

Cui

2015

J Petrol Explor Prod Technol

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“…Compared with conventional perforating‐fracturing technology, the advantages of hydraulic radial jet drilling technology are obvious: pollution‐free, hydraulic fracturing, rock tensile failure, and cavitation for reservoir modification, etc 14 The schematic of a conventional RJD system is shown in Figure 1. Radial horizontal well technology has been applied in China, the United States, Canada, Russia, Argentina, Bolivia, Egypt, and other countries since its introduction 15‐19 and has achieved different effects.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the factors affecting the self‐propelled force in a multi‐orifice nozzle using a novel simulation method

Zhang

2020

Energy Science & Engineering

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A multi‐orifice nozzle is the primary actuator of radial jet drilling for the stimulation of unconventional and low‐permeability reservoirs. This research developed a 3D flow field simulation model to investigate the self‐propelled force of a multi‐orifice nozzle based on ANSYS‐CFX. To evaluate the self‐propelled ability of the nozzle, investigation was performed on the effects of the angle, number, the diameter of the forward and backward orifices of the multi‐orifice nozzle, and the diameter of the micro‐hole in the radial well on its self‐propelled ability by sensitivity analysis. The results revealed that the self‐propelled force slightly increased with the angle of forward orifice increasing, and decreased with the angle of backward orifice increasing; and that the self‐propelled force had a tendency to decrease significantly with the number of forward orifices increasing, and increased slightly with the number of backward orifices increasing. The self‐propelled forces for different combinations of forward and backward orifices were obtained by the simulation method, which agreed well with those obtained by the calculation method, with an average accuracy of 95.82%. It was observed that the self‐propelled force increased substantially as the value of K (d2/d1) increased, but tended to slow down when the flow rate was within a certain range. Besides, with the increase in the diameter of the micro‐hole, the self‐propelled force reduced, and increased substantially as the inlet flow rate increased, but tended to slow down as the inlet flow rate further increased. Thus, to ensure the self‐propelled ability of the jet nozzle, a set of optimal structural parameters can be used to generate the target self‐propelled ability. The research improves the working performance of multi‐orifice nozzles and provides theoretical guidance for hydraulic radial jet drilling process.

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“…1 (Dickinson et al 1992a, b;Buckman and Doton 2001;Kamel 2016). It can realize multiple radial holes drilling in different directions in a reservoir, increase the contact area between reservoir and bore hole, enhance well production rate, and has been widely applied or tested in low-permeability reservoirs, marginal reservoirs, depleted reservoirs, heavy-oil reservoirs, fault block reservoirs and coalbed methane (CBM) reservoirs in the USA, Canada, China, Egypt, Argentina, India and Russia, among other countries (Buset et al 2001;Cirigliano and Blacutt 2007;Bruni et al 2007;Ursegov et al 2008;Huang et al 2013;Steven and Ahmed 2013;Balch et al 2016). A high-pressure flexible hose is employed to realize the right diversion in the casing deflector and convey water-jet energy to break the rock (Wang et al 2016;Kamel 2017;Yang et al 2015).…”

Section: Introductionmentioning

confidence: 99%

Flow structure and rock-breaking feature of the self-rotating nozzle for radial jet drilling

et al. 2019

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For improving the hole-enlarging capability, roundness and rock-breaking efficiency of the nozzle in radial jet drilling, a new structure of self-rotating nozzle was put forward. The flow structure and rock-breaking features of the self-rotating nozzle were investigated with sliding mesh model and labortary tests and also compared with the straight and the swirling integrated nozzle and multi-orifice nozzle which have been applied in radial jet drilling. The results show that the self-rotating jet is energy concentrated, has longer effective distance, better hole-enlarging capability and roundness and impacts larger circular area at the bottom of the drilling hole, compared with the other two nozzles. Forward jet flow generated from the nozzle is peak shaped, and the jet velocity attenuates slowly at the outer edge. Due to periodic rotary percussion, the pressure fluctuates periodically on rock surface, improving shear and tensile failures on the rock matrix and thereby enhancing rock-breaking efficiency. The numerical simulation results of the flow structure of the nozzle are consistent with the experiments. This study provides an innovative approach for radial jet drilling technology in the petroleum industry.

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First Results of Cyclic Steam Stimulations of Vertical Wells with Radial Horizontal Bores in Heavy Oil Carbonates (Russian)

Cited by 20 publications

References 0 publications

Optimizing the branch number and branch length of radial drilling in high water cut low permeability reservoirs

Optimizing the branch number and branch length of radial drilling in high water cut low permeability reservoirs

Investigation of the factors affecting the self‐propelled force in a multi‐orifice nozzle using a novel simulation method

Flow structure and rock-breaking feature of the self-rotating nozzle for radial jet drilling

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