... required to penetrate into the formation to create a wormhole—a function of reactive fluid used, injection rate, and temperature—the more efficient the treatment. Hydrochloric acid (HCl) has both a high dissolution rate and dissolution capacity which, at high temperature, results in dissolution of the face...

... treatment wax inhibition hydrate inhibition scale inhibition Fluid Dynamics stimulation treatment scale inhibitor return concentration profile wellbore wellbore model pseudo-adsorption isotherm dissolution squeeze treatment design inhibitor international symposium society of petroleum...

... and experimental studies show the significance of HF acid concentration in controlling the outcome of the treatment: adding too much HF acid will result in secondary and tertiary reactions damaging the reservoir while the use of low concentrations of HF will result in insufficient dissolution. The objective...

... with pre- and post test analyses to identify potential damage mechanisms. Those identified included kaolinite dissolution, precipitation of Barsium and cesium silicate, and swelling of kaolinite due to the incorporation of potassium and cesium into the kaolinite lattice. To confirm the findings from...

... to dissolution and re-precipitation of iron phosphonate species, together with fines mobilized (also thought to be due to dissolution effects) which propagated some distance through the core, leading to pore throat blockages. In an example case, complete blockage occurred as the front of the injection chemical...

... of formation damage during CO 2 injection. We found that it has high rate of chemical reactivity and dissolution of reservoir rock near the wellbore. The dissoluted reservoir rock particles get precipitated in the reservoir away from the injection well, plugging the pores and reducing the formation...

... chemical reaction hydrochloric acid ilmenite particle filter cake water-based filter cake filtration permeability acid reaction dissolution drilling fluid chemistry drilling fluid formulation ilmenite water-based filter cake ilmenite titanium remove ilmenite water-based filter cake removal...

...), mineral dissolution and cation stripping. The experimental component of this investigation consisted of continuous permeability measurements during flooding at various salinity steps and simultaneous collection of the effluent. The effluent was analyzed using Inductively Coupled Plasma (ICP elemental...

... and face dissolution. For high temperature treatments, the alternatives are limited; including chelating agents, such as GLDA (glutamic acid-N,N-diacetic acid) and HEDTA (N-hydroxyethyl-ethylenediamine-triacetic acid). This paper discusses the evaluation of an innovative technique to formulate a new...

... dissolution, sludging with heavy crude and disposal of spent acid limits the use of acid pre-flushes. A recently developed non-acid based fluid capable of stimulating high temperature sandstone formations was taken as the starting point to develop a customized solution to remove formation damage and control...

... treatments. After initial dissolution of gypsum in live mud acid, dissolved calcium will precipitate as both calcium fluoride and calcium sulfate in spent HCl/HF solutions. Similarly, gypsum has higher solubility limit in live HCl acid compared to its spent solutions. This resulted in re-precipitation...

... wormhole propagation field condition dissolution optimum injection rate Introduction The major goal of acid stimulation under matrix conditions into carbonate formation is to create conductive flow channels known as wormholes that bypass the damage in the formation. These flow channels make...

... Abstract Matrix stimulation of carbonates involves injecting acid into the wellbore where it reacts with the formation and bypasses the damage. Different types of patterns, like face dissolution, wormhole, and uniform dissolution, are created as a result of the dissolution process. During acid...

... acid system, resulted in total scale dissolution, in laboratory tests. Furthermore, the high silica content of the scale, absence of problematic minerals in the formation and fractured nature of the reservoir, persuaded us to eliminate the HCl preflush on these treatments, a novel concept that had...

... effect, to some extent, reducing ferric iron back to the ferrous state. However, depending on circumstances, the ferric iron concentration in HCl can be extremely high due to the dissolution of the ferric oxides (rust) that quickly form when steel is exposed to air. For this reason, it is very much...

... fields, little information is available on downhole inhibitor squeeze. Scale removal lab studies included dissolution of the recovered scales and corrosion tests. A different fluid package was selected for downhole and SCSSV conditions. Scale remediation using downhole acid washes proved efficient...

... the kinetics of mineral dissolution in mechanically ground field samples. Treatment with acidic chelant fluids generated high levels of dissolved calcium, silicon, and aluminum that remained in solution over time. For comparison, conventional mineral-acid treatment of the field samples generated high levels...

... are not likely generated in homogenous rocks, even with an extremely high concentration HF acid solution at a high temperature. Uniform dissolution patterns are created in such samples as supported from our experimental work. sandstone concentration structural geology experiment simulator hf...

... proppant can result in a long-term reduction in mineral dissolution rate, compaction, embedment, and polymer anchoring sites. Field data shows this effect has a dramatic improvement in fracturing fluid recovery and well productivity. conductivity fracturing materials porosity pressure solution...

... scale remediation dissolution procedure russia fluid loss control asphaltene remediation oilfield chemistry wax remediation wax inhibition precipitate paraffin remediation acid preflush Introduction Russia's Siberian basins are extensive in area, and vary greatly in their geology...