The present invention relates to an environmentally preferable microemulsion composition that is suitable for formation stimulation, remediation, and drilling operations, and a method to make and use the same. Specifically, the environmentally preferable microemulsion composition of the present invention can comprise glycol ether, terpene, ethoxylated alcohol, polyoxyethylene sorbitan ester, and a carrier fluid.

A treatment to temporarily block highly permeable areas in a wellbore having a temperature of less than 160 F. A diverting agent, a catalyzer, and a viscosifier are mixed together and pumped in the wellbore where the treatment flows in the most highly permeable areas. The diverting agent then begins to block those areas as the well is treated finally causing the fluid to divert to other now more highly permeable areas of the wellbore. After less than 48 hours the diverting agent degrades sufficiently to restore the permeablility of the wellbore.

Methods including introducing a treatment fluid into a wellbore in a subterranean formation, wherein the subterranean formation includes a coal seam gas reservoir, a freshwater reservoir, and formation laminae interposed therebetween, and the wellbore penetrating each, and wherein the treatment fluid comprises an aqueous base fluid and an aqueous curable resin; penetrating at least a portion of the formation laminae with the aqueous curable resin while maintaining the treatment fluid in the wellbore at a pressure sufficient to prevent the flow of freshwater from the freshwater reservoir into the wellbore; curing the aqueous curable resin, thereby stabilizing the formation laminae; creating permeability pathways in the coal seam gas reservoir itself; removing the treatment fluid from the wellbore; recovering gas from the coal seam gas reservoir.

A polyoxalate containing, as a chief constituent unit, a recurring unit represented by the following formula (1): (COCOO-A-O).sub.n wherein n is a positive number, and A is a divalent organic group, and having a quantity of heat of fusion Hm of not less than 60 J/g as measured by DSC in the first time of elevating the temperature, thereby permitting the components to be volatilized in an amount of not more than 2.0% by weight when the temperature is elevated up to 200 C. as measured by the TGA, and having a 5% weight loss temperature (Td5%) of not higher than 230 C. Also disclosed is a process for production of the polyoxalate.

Compositions and methods for treating a water and hydrocarbon producing subterranean formation to reduce the water permeability of the formation without substantially reducing the hydrocarbon permeability of the formation are provided. In one embodiment, the method includes providing a treatment fluid including a base fluid and a relative permeability modifier including a polymer of at least one hydrophilic monomer and at least one hydrophobically modified hydrophilic monomer, wherein the polymer includes a sulfonate moiety, and introducing the treatment fluid into at least a portion of a subterranean formation.

Polyglycolic acid resin short fibers for a well treatment fluid, the fibers having the following characteristics of (a) to (e): (a) an outside diameter of 5 to 300 m; (b) a fiber length of 1 to 30 mm; (c) fineness of 0.1 to 25 D; (d) strength of 1 to 20 gf/D; and (e) a ratio of an area of the polyglycolic acid resin with respect to an area of a circle circumscribing a cross section of the fibers being from 10 to 95%; and a well treatment fluid containing the polyglycolic acid resin short fibers for a well treatment fluid.

A hydraulic fracturing method for recovering oil from a low-temperature subterranean oil formation is disclosed. Before, during, or after inducing hydraulic fracturing within the formation, a particulate, degradable polyester diverting agent is introduced into the formation in an amount effective to improve oil production from the formation. The diverting agent is allowed to degrade, and oil is recovered. The diverting agent has a melting point greater than the average temperature of the formation and is selected from: (i) ethylene glycol succinates; (ii) acid-terminated ethylene glycol succinates; (iii) acid-terminated polyglycolic acids; (iv) acid-terminated polylactic acids; and (v) mixtures of any of (i) through (iv) with a half acid ester.

Methods and systems including introducing a treatment fluid into a subterranean formation wellbore. The treatment fluid includes an aqueous base fluid; nitrogen-containing waste plastic; and carbon dioxide. The nitrogen-containing waste plastic is hydrolyzed in the aqueous base fluid under conditions in the subterranean formation wellbore, thereby forming hydrolysis reaction products. The hydrolysis reaction products and the carbon dioxide are reacted in the subterranean formation wellbore.

A process for forming a particle carrier system includes supplying a particle carrier, the particle carrier having a surface and modifying the particle carrier surface to include a first ionic functional group. The process also includes chemically binding the first ionic functional group on the particle carrier surface to a first ionic molecule.

The present disclosure relates to tracing gas flow in a hydrocarbon reservoir with compositions including a degradable polymer and a detectable component. An exemplary method includes introducing a tracer composition at a first location in the reservoir, contacting the tracer composition with the reservoir to hydrolyze the degradable polymer, and detecting a degraded tracer composition including the hydrolyzed polymer and the detectable component in a gas sample collected at a second location in the reservoir.