Oil-based self-degradable gels as diverting agents for oil well operations

Vernáez, Oscar; Garcia, A. L.; Castillo, Franklin; Ventresca, María L.; Müller, Alejandro J.

doi:10.1016/j.petrol.2016.07.029

Cited by 24 publications

(9 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For Test1 experiment, two cores with different permeability (1060 mD and 110 mD) were placed in core holders of parallel core, which were connected by the same inflow line and splitting the flow into two cores (Vernáez et al 2016;Santvoort and Golombok 2015;Mahmoud et al 2017). The pressure drop is the same for both cores, and the outflow is measured independently (Siddiqui et al 2003;Alvarez et al 2000;Vernáez et al 2016). During the initial state, Brine (CaCl 2 + NaHCO 3 was applied to simulate sandstone reservoirs containing soluble hydrochloric acid) was injected into the system.…”

Section: Reservoir Diversion Acidification Testmentioning

confidence: 99%

Experimental study of acidizing diversion effect on different permeability of heterogeneity sandstone reservoirs

Liu

et al. 2019

J Petrol Explor Prod Technol

View full text Add to dashboard Cite

In the paper, the diversion laws between VES acid and heterogeneous sandstone were carried out by diversion acidizing experiments. The results showed that the viscoelastic surfactants of diversion acid reached the maximum value at hydrochloric acid concentration between 5 and 11%, when higher than 13% and the diversion acid with low viscosity which was beneficial to acid injecting construction. The results of parallel core experiment revealed that diversion acid has better divert effect in the reservoir with better homogeneity, and injected acid PV of diversion acid conforms to the Darcy's law when the permeability of glass core is less than 1000 mD. From the overall results, it can be concluded that diversion acid is suitable for heterogeneous sandstone reservoirs, and the conclusion is suitable for pilot tests in oil field.

show abstract

Section: Reservoir Diversion Acidification Testmentioning

confidence: 99%

Experimental study of acidizing diversion effect on different permeability of heterogeneity sandstone reservoirs

Liu

et al. 2019

J Petrol Explor Prod Technol

View full text Add to dashboard Cite

show abstract

“…In some research, several independent cores were parallelized to simulate heterogeneous formations in the laboratory (Shamekhi 2013;Xiao et al 2014;Vernáez et al 2016). However, the system without capillary communication can hardly represent the state of the real flow.…”

Section: Foam Flooding Performance In 2d Heterogeneous Modelsmentioning

confidence: 99%

Influence of formation heterogeneity on foam flooding performance using 2D and 3D models: an experimental study

Sun

Zhao

et al. 2019

Pet. Sci.

View full text Add to dashboard Cite

The formation heterogeneity is considered as one of the major factors limiting the application of foam flooding. In this paper, influences of formation properties, such as permeability, permeability distribution, interlayer, sedimentary rhythm and 3D heterogeneity, on the mobility control capability and oil displacement efficiency of foam flooding, were systematically investigated using 2D homogeneous and 2D/3D heterogeneous models under 120 °C and salinity of 20 × 10 4 mg/L. The flow resistance of foam was promoted as the permeability increased, which thus resulted in a considerable oil recovery behavior. In the scenario of the vertical heterogeneous formations, it was observed that the permeability of the high-permeable layer was crucial to foam mobility control, and the positive rhythm appeared favorable to improve the foam flooding performance. The additional oil recovery increased to about 40%. The interlayer was favorable for the increases in mobility reduction factor and oil recovery of foam flooding when the low permeability ratio was involved. For the 3D heterogeneous formations, foam could efficiently adjust the areal and vertical heterogeneity through mobility control and gravity segregation, and thus enhancing the oil recovery to 11%-14%. The results derived from this work may provide some insight for the field test designs of foam flooding.

show abstract

“…Reversible gelling systems for diversion in sandstone can comprise a polymer, a crosslinker, a gel accelerator, and an oxidant, where temperature activates the crosslinker to build viscosity and the oxidant subsequently decomposes the gel after a desired period of time. [10][11][12] Less sophisticated polymeric pills rely on a breaking batch injected after treatment.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of viscoelastic surfactant‐based diverting agent during the chemical treatment of sandstone reservoirs

Moghaddam¹,

Doorn²,

Santos³

et al. 2022

Can J Chem Eng

View full text Add to dashboard Cite

The challenges of diversion during the stimulations of carbonate formations have been widely studied for decades. It has been shown that viscoelastic surfactants (VES) are among the effective diverting solutions which can be used during the stimulation of carbonate formations. These chemicals benefit from the reaction products between the acid and the calcite to increase the viscosity of the acid, therefore reducing, temporarily, the permeability of the first invaded rock layer, which holds the highest permeability. This temporary blockage steers the remaining acid to the layers with lower permeability that need treatment. This is usually called self‐diverting acidizing treatment. However, the same approach may not necessarily be applied for sandstone formations that are not calcite rich. In such cases, combining acid stages with batches of diverting agents is still feasible. For this approach, VES is also a suitable, non‐damaging solution that is often overlooked. In this study, the application of VES as a diverting agent was investigated during the chemical treatment operations in sandstone formations. Several dual core‐flooding experiments were performed at high pressure and high temperature (HPHT) conditions using sandstone core samples with high permeability contrast.

show abstract

Oil-based self-degradable gels as diverting agents for oil well operations

Cited by 24 publications

References 13 publications

Experimental study of acidizing diversion effect on different permeability of heterogeneity sandstone reservoirs

Experimental study of acidizing diversion effect on different permeability of heterogeneity sandstone reservoirs

Influence of formation heterogeneity on foam flooding performance using 2D and 3D models: an experimental study

Evaluation of viscoelastic surfactant‐based diverting agent during the chemical treatment of sandstone reservoirs

Contact Info

Product

Resources

About