Abstract: Some examples of an emulsion system for treating deep water blockage can be prepared by emulsifying a first aqueous phase in a first organic phase to prepare a first emulsion. A second aqueous phase can be emulsified in a second organic phase to prepare a second emulsion. The first emulsion and the second emulsion can be flowed into a subterranean formation. The first aqueous phase and the second aqueous phase, when mixed, can react to release nitrogen and heat.

Abstract: Provided is a method and composition for the in-situ generation of synthetic sweet spots in tight-gas formations. The composition can include nitrogen generating compounds, which upon activation, react to generate heat and nitrogen gas. The method of using the composition includes injecting the composition into a tight-gas formation such that upon activation, heat and nitrogen gas are generated. Upon the generation of nitrogen gas and heat within the formation, microfractures are produced within the formation and the hydrostatic pressure within the reservoir is reduced to less than the reservoir fluid pressure, such that the rate of production of hydrocarbons from the formation is increased.

Abstract: Some examples of an emulsion system for treating deep water blockage can be prepared by emulsifying a first aqueous phase in a first organic phase to prepare a first emulsion. A second aqueous phase can be emulsified in a second organic phase to prepare a second emulsion. The first emulsion and the second emulsion can be flowed into a subterranean formation. The first aqueous phase and the second aqueous phase, when mixed, can react to release nitrogen and heat.

Abstract: In some examples of inhibiting toxicity of acid systems used for treating metals, a metal is pickled with a pickling composition that includes a first quantity of an acid and a second quantity of a corrosion inhibiting iodide salt. A mixture of the first quantity and the second quantity modify metallic properties of the pickled metal. The corrosion inhibiting iodide salt is added directly to the pickling composition independent of any other corrosion inhibitor or corrosion inhibiting polymer.

Abstract: Provided is a method and composition for the in-situ generation of synthetic sweet spots in tight-gas formations. The composition can include nitrogen generating compounds, which upon activation, react to generate heat and nitrogen gas. The method of using the composition includes injecting the composition into a tight-gas formation such that upon activation, heat and nitrogen gas are generated. Upon the generation of nitrogen gas and heat within the formation, microfractures are produced within the formation and the hydrostatic pressure within the reservoir is reduced to less than the reservoir fluid pressure, such that the rate of production of hydrocarbons from the formation is increased.

Abstract: Removal of filtercake particles from a wellbore is achieved by injecting two (2) water-soluble nitrogen-containing salts and an organic acid resulting in the generation of nitrogen gas and elevated temperature.

Abstract: A method for treating an open-hole horizontal water injection well in a tight reservoir rock formation to remove undesirable materials such as formation-damaging polymers and chemical residues from pipe dope from the formation surface and adjacent formation pores prior to an acidizing treatment includes maintaining the drilling fluid pressure on the injection zone to induce flowback of formation fluid which is produced at the wellhead located at the earth's surface, where it is monitored for a reduction in the undesirable materials. In the event that the formation pressure is insufficient to produce formation fluid flowback, a nitrogen-lift is introduced at a predetermined location in the adjacent vertical well that will reduce the drilling fluid pressure to induce production of formation fluid at the wellhead.

Abstract: A method of preventing phase separation of a viscoelastic surfactant fluid or diverting agent due to ferric ions during matrix acidizing of an oil well which involves the injection of both citric acid and acetic acid which prevents the separation of the viscoelastic diverting agent/acid with ferric ions which avoids damage to well productivity and/or injectivity.

Abstract: A method of preventing phase separation of a viscoelastic surfactant fluid due to ferric ions during matrix acidizing is described which involves including citric acid and acetic acid in the surfactant/acid fluid formulation.

Abstract: An open-hole horizontal water injection well in a tight formation is conditioned prior to an acidizing treatment by subjecting the injection zone to a flowback stage, optionally at reduced pressure, in order to remove undesirable materials such as formation-damaging polymers, chemical residues from pipe dope and the like, from the surface and adjacent formation pores, and producing the formation fluid to the wellhead at the earth's surface where it can be monitored for a reduction in the undesirable materials.

Abstract: A method and composition for protecting cement surfaces in a well bore treatment zone from the destructive effects of acid mud and other acidization processes commonly used to stimulate hydrocarbon production from the formation, includes contacting the cement with an aqueous acid mixture of HAc and HF in a mutual solvent for a sufficient period of time to form a protective deposit or precipitate layer that is resistant to the acidization composition. In a preferred embodiment, the aqueous acid mixture includes corrosion inhibitors and inhibitor aids, and a preflush with an ammonium chloride solution in a mutual solvent is used to prepare the cement surfaces in the treatment zone.

Abstract: A method and composition for protecting cement surfaces in a well bore treatment zone from the destructive effects of acid mud and other acidization processes commonly used to stimulate hydrocarbon production from the formation, includes contacting the cement with an aqueous acid mixture of HAc and HF in a mutual solvent for a sufficient period of time to form a protective deposit or precipitate layer that is resistant to the acidization composition. In a preferred embodiment, the aqueous acid mixture includes corrosion inhibitors and inhibitor aids, and a preflush with an ammonium chloride solution in a mutual solvent is used to prepare the cement surfaces in the treatment zone.

Abstract: A method and composition for protecting cement surfaces in a well bore treatment zone from the destructive effects of acid mud and other acidization processes commonly used to stimulate hydrocarbon production from the formation, includes contacting the cement with an aqueous acid mixture of HAc and HF in a mutual solvent for a sufficient period of time to form a protective deposit or precipitate layer that is resistant to the acidization composition. In a preferred embodiment, the aqueous acid mixture includes corrosion inhibitors and inhibitor aids, and a preflush with an ammonium chloride solution in a mutual solvent is used to prepare the cement surfaces in the treatment zone.

Abstract: A method and composition for protecting cement surfaces in a well bore treatment zone from the destructive effects of acid mud and other acidization processes commonly used to stimulate hydrocarbon production from the formation, includes contacting the cement with an aqueous acid mixture of HAc and HF in a mutual solvent for a sufficient period of time to form a protective deposit or precipitate layer that is resistant to the acidization composition. In a preferred embodiment, the aqueous acid mixture includes corrosion inhibitors and inhibitor aids, and a preflush with an ammonium chloride solution in a mutual solvent is used to prepare the cement surfaces in the treatment zone.