Reactivity mapping methods are provided. A method may include: analyzing each of a group of inorganic particles to generate data about physical and/or chemical properties of the inorganic particles; and generating correlations between the properties of inorganic particles based on the data.

Multiple charged cationic compounds, which are derived from polyamines through an aza-Michael addition with an α, β-unsaturated carbonyl compound, in a clay treatment composition to reduces clay swelling, clay migration, and sludge formation in a subterranean formation in oil and gas operations are provided. The disclosed methods or compositions are found to be more effective than those methods or compositions commonly used for reducing clay swelling, clay migration, and sludge formation.

Multiple charged cationic compounds, which are derived from polyamines through an aza-Michael addition with an α, β-unsaturated carbonyl compound, in a clay treatment composition to reduces clay swelling, clay migration, and sludge formation in a subterranean formation in oil and gas operations are provided. The disclosed methods or compositions are found to be more effective than those methods or compositions commonly used for reducing clay swelling, clay migration, and sludge formation.

An apparatus for injecting an accelerating fluid into an oil well includes casing open at the ends into which a cement flows and positioned inside the well forming an annular zone with its walls. The casing includes a hollow cylindrical body with lateral surfaces integral with the casing internal surfaces and a central hole through which a cement flows, with a lower horizontal section than the casing section. The apparatus includes hollow internal chamber with an accelerating fluid; one or more body inlet devices, which put the body and chamber in fluid communication. The inlet devices are positioned on one of the hollow cylindrical body base surfaces. The apparatus includes at least one body outlet devices, which puts the chamber in fluid communication with the conduit through the central hole, positioned radially with respect to the cylindrical body axis and along the central hole internal surface.

An apparatus for injecting an accelerating fluid into an oil well includes casing open at the ends into which a cement flows and positioned inside the well forming an annular zone with its walls. The casing includes a hollow cylindrical body with lateral surfaces integral with the casing internal surfaces and a central hole through which a cement flows, with a lower horizontal section than the casing section. The apparatus includes hollow internal chamber with an accelerating fluid; one or more body inlet devices, which put the body and chamber in fluid communication. The inlet devices are positioned on one of the hollow cylindrical body base surfaces. The apparatus includes at least one body outlet devices, which puts the chamber in fluid communication with the conduit through the central hole, positioned radially with respect to the cylindrical body axis and along the central hole internal surface.

Cement compositions and methods for using the same in subterranean formations are provided. In one embodiment, the methods include introducing a treatment fluid including an aqueous base fluid, at least one viscoelastic surfactant, a divalent salt, a metal salt; and a metal oxide into a wellbore penetrating at least a portion of a subterranean formation; and allowing the treatment fluid to at least partially set in the subterranean formation.

Cement compositions and methods for using the same in subterranean formations are provided. In one embodiment, the methods include introducing a treatment fluid including an aqueous base fluid, at least one viscoelastic surfactant, a divalent salt, a metal salt; and a metal oxide into a wellbore penetrating at least a portion of a subterranean formation; and allowing the treatment fluid to at least partially set in the subterranean formation.

Cement compositions of the present disclosure include a cement precursor, water, and a cement retarder that includes hydrocarboxylic acid derivatives. In particular, the cement compositions include from 10 wt.% to 70 wt.% cement precursor, from 5 wt.% to 70 wt.% water, and from 0.1 percent by weight of cement (BWOC) to 10 percent BWOC cement retarder comprising the hydrocarboxylic acid derivatives. The hydrocarboxylic acid derivatives provide increased thickening time to the cement compositions at downhole temperatures of greater than or equal to 50° C. The present disclosure further includes methods of cementing a wellbore using the cement compositions with the cement retarder comprising the hydrocarboxylic acid derivatives.

Cement compositions of the present disclosure include a cement precursor, water, and a cement retarder that includes hydrocarboxylic acid derivatives. In particular, the cement compositions include from 10 wt.% to 70 wt.% cement precursor, from 5 wt.% to 70 wt.% water, and from 0.1 percent by weight of cement (BWOC) to 10 percent BWOC cement retarder comprising the hydrocarboxylic acid derivatives. The hydrocarboxylic acid derivatives provide increased thickening time to the cement compositions at downhole temperatures of greater than or equal to 50° C. The present disclosure further includes methods of cementing a wellbore using the cement compositions with the cement retarder comprising the hydrocarboxylic acid derivatives.

A chemical gel system having a polymer and a silicon oxide Janus nanosheets crosslinker for treating thief zones in carbonate formations. The polymer and silicon oxide Janus nanosheets crosslinker may form a crosslinked polymer gel to reduce or prevent water production via thief zones during hydrocarbon production. The silicon oxide Janus nanosheets crosslinker includes a first side having negatively charged functional groups and a second side having amines. The negatively charged functional groups may include negatively charged oxygen groups and hydroxyl groups. Methods of reducing water production in a thief zone using the silicon oxide Janus nanosheets crosslinker and methods of manufacturing the silicon oxide Janus nanosheets crosslinker are also provided.