... Abstract This paper provides information on the journey and lessons learned from one well’s acid MSF from the required lab design, through on-site fluids’ QA/QC findings, to the 4 days of flow back sample analyses indication. Several pre-job lab assessments were conducted to: Optimize...

... Abstract Acid systems are widely recognized by the oil and gas industry as an attractive class of fluids for efficient stimulation of carbonate reservoirs. One of the major challenges in carbonate acidizing treatments is adjusting the convective transport of acid deep into the reservoir while...

... scale sample visible spectra materials and corrosion dissolver gas well ammonium chloride spectra pyrite remediation of hydrates THP acid reaction citrate-based dissolver flowline corrosion riser corrosion Introduction Mineral scale disposition is one of the major problems in crude...

... means includes acids, oxidizers, chelating agents and enzymes or a combination of these chemicals. Mutual solvents and microemulsifing surfactants are incorporated with the acid recipe to dissolve oil residue and water-wet the surface. Examples of common mutual solvents include 2-Butoxyethanol, ethylene...

... Acid fracturing is an enhanced method of hydraulic fracturing used mainly in low permeability carbonates and sometimes in shale and coal bed methane reservoirs to enhance the fracture conductivity and the production rate ( Guo et al., 2017 ). Instead of using normal hydraulic fracturing fluids...

... where k g is mass transfer coefficient, in/sec, Γ is foam quality, W is fracture width, in, u is velocity in x directions, L/t, L is fracture length, in, C is acid concentration, dimensionless, and C o is an inlet acid concentration, which is dimensionless. Ford and Roberts (1985) tested...

... All the previous works mentioned above is meaningful to better understand the transient pressure behavior of fractured carbonate reservoir after acid fracturing. It can be noted that with the assumption of linear flow and mid-high permeability matrix, the seepage model of carbonate reservoir acid...

...Introduction The emulsified acid was first introduced for the industry through a patent granted to Melvin de Groote, an American chemist, in 1933 (De Groote 1933 ). In his procedure for making the emulsion, he used HCl and nitric acid and used crude oil with other liquids as the continuous...

... Use the emulsified 15 wt% HCL acid with a solvent system to remove the sludge from the water disposal well. Fresh water should be used to prepare the emulsified 15 wt% HCL/solvent system since the salt was found to induce phase separation. The emulsified 15 wt% HCL/solvent system should...

... The concentration of active APCA was determined using a complexometric titration method ( Sokhanvarian 2015 ). This method involves titrating samples containing APCAs with a solution of FeCl 3 with known concentration using tiron as an indicator and a buffer made from chloroacetic acid and sodium acetate...

... The Navier-Stokes equations, which represent the conservation of mass and momentum, and govern the motion of fluids, are the heart of the acid transport models because they predict the velocity profile and the pressure distribution in a given geometry. The Navier-Stokes equations...

.... Among other examined dissolver systems, (HCl) acid was found to be the most effective. Effects of acid additives on the solubility of scales were examined in order to optimize the acid recipe. The formation of interest is sandstone containing up to 2 wt. % authigenic clays. The use of HCl acid may...

... The increasing number of fracture stages for MSAF wells calls for large pad volumes and acid sequences for fracturing. Initially, large treatment volumes, approximately 1,800 gal/ft of net interval to be stimulated, of 28% gelled HCl acid was used for most acid fracturing treatments in these sour...

... from downhole tools and compositional analysis conducted to characterize both crystalline and non-crystalline compounds. Composition of scale samples was determined by X-ray diffraction (XRD), X-ray fluorescence (XRF), and acid solubility for more accurate analysis. XRD and XRF results showed...

... for energy has extended the development horizon towards relatively tighter formations all over the world. In Saudi Arabia, hydrochloric and organic acids have been extensively used to enhance well productivity or injectivity in low permeability formations. However, the use of these acids was associated...

... and as such, using it in this formation will serve as a trial to shift from conventional stimulation methods to fracturing when facing tighter formations. This particular acid frac was performed in a tight carbonate formation. The chosen well is a newly drilled trilateral producer completed with a multistage frac...

... Abstract The increasing demand for energy has extended the development horizon towards relatively tighter formations. However, experience has shown that the most successful technique to optimize production from these tight carbonate formations would require multistage acid fracture stimulation...

... Abstract Acid proved an efficient near wellbore skin damage removing agent in carbonate production and injection wells. Nevertheless, improving acid stimulation design is a continuous need in oil industry. Formation analysis logs for some of South Ghawar power water injectors have shown...

... Abstract Multistage acid fracture treatments are utilized in low-permeability carbonate reservoirs (permeability <10 md) to stimulate the formation by creating highly conductive fractures in the formation and bypassing near wellbore damage. The fracture is generated at high pressures...

... and barium, strontium and calcium sulfate, are often present. Both mechanical and chemical methods have been applied for scale removal. Chemical dissolvers based on concentrated hydrochloric acid have been the most effective solvents. This types of dissolvers are very corrosive to well completion metallurgy...