A drilling fluid containing a liquid phase, a weighting agent (e.g. barite, calcite, ilmenite), and perlite is described. The drilling fluid may further contain one or more additives including a defoamer, a fluid-loss control agent, a viscosifier, an antiscalant, a deflocculant, a lubricant, a clay stabilizer, a bridging agent, and a surfactant. A process of drilling a subterranean geological formation utilizing the drilling fluid is also specified. The introduction of perlite to the drilling fluid is effective in reducing the thickness and permeability of filter cakes formed during the drilling process.

Methods and systems for using an invert emulsion fluid that is beneficial in the drilling, completing and working over of subterranean wells are provided. In some embodiments, the method includes: preparing a treatment fluid including an invert emulsion, wherein the invert emulsion further includes an aqueous dispersed phase, an oleaginous continuous phase, and an amine surfactant emulsifier and placing the treatment fluid in a wellbore penetrating at least portion of a subterranean formation.

Chemical additives useful for hydraulic fracturing operation are comprising of lubricant/nonpolar solvents; hydro-dual-phobic domains as core encapsulated by emulsifiers as shell, suspended in water by hydrogel polymers as hydrophilic domains; soy protein isolate (SPI) and sweet rice flour were modified with crosslinking polymers of isocyanate as hydrophobic domains, which is incorporated into the frac fluid as a standard alone friction reducer solution or as an enhancer of frac fluid viscosity of the final frac fluid products in high salinity brines having a concentration as high as 25.0% at an ambient temperature at a downhole well temperature from 30 to 180° F.

The present disclosure relates to downhole fluid additives including a clay, a hydroxylated polymer, a cation, and water. The disclosure further relates to downhole fluids, including drilling fluids, spaces, cements, and proppant delivery fluids containing such as downhole fluid additive and methods of using such fluids. The downhole fluid additive may have any of a variety of functions in the downhole fluid and may confer any of a variety of properties upon it, such as salt tolerance or desired viscosities even at high downhole temperatures.

Terpene-based spotting fluid compositions and processes for freeing differentially stuck pipe are provided. A spotting fluid composition includes a terpene and an acid, such that the acid initiates an exothermic polymerization reaction of the terpene. Another spotting fluid composition includes an invert emulsion having a terpene external phase and a non-miscible organic hygroscopic fluid internal phase. The terpene emulsion spotting fluid composition may be introduced downhole in the vicinity of a portion of a differentially stuck pipe such that the spotting fluid composition contacts a filter cake surrounding the portion of the differentially stuck pipe. An acid may be introduced downhole in the vicinity of a portion of a differentially stuck pipe such that the acid initiates an exothermic polymerization reaction of the terpene of the terpene emulsion spotting fluid composition.

Drilling fluid compositions and methods for using drilling fluid compositions are provided with enhanced lubricating properties that include an aqueous-based fluid, one or more drilling fluid additives, and a lubricating additive. The lubricating additive may be an epoxidized α-olefin and the drilling fluid may include the lubricating additive in an amount ranging from about 1 ppb to about 20 ppb. Methods for using the drilling fluid compositions may further include mixing an aqueous base fluid with one or more drilling fluid additives and a lubricating additive, wherein the lubricating additive includes epoxidized α-olefin and the drilling fluid may include the lubricating additive in an amount ranging from about 0.5 ppb to about 20 ppb, and introducing the drilling fluid to a subterranean formation.

Provided are a polyaspartic acid derivative and a preparation method and use thereof as a lubricant, and a water-based drilling fluid and use thereof. The polyaspartic acid derivative has a structure shown in formula I, wherein, in the formula I, R.sup.1 is selected from the group consisting of —CH.sub.2—CH.sub.2—CH.sub.2—, —CH.sub.2—CH.sub.2—CH.sub.2—CH.sub.2—, and —CH.sub.2—CH.sub.2—CH.sub.2—CH.sub.2—CH.sub.2—CH.sub.2—; R.sup.2 is selected from the group consisting of —OH, —N—(CH.sub.2—CH.sub.2—OH).sub.2, —O—CH.sub.2—CH.sub.2—NH—CH.sub.2—CH.sub.2—OH, —NH—CH.sub.2—CH.sub.2—OH, and —O—CH.sub.2—CH.sub.2—NH.sub.2; and n and m are independently 8 to 17. ##STR00001##

The present invention relates to the field of petroleum industry phase oilfield chemistry, and specifically relates to a bionic and dual-phobic drilling fluid. The drilling fluid contains a bionic wall-fixing agent, a bionic lubricant, a super dual-phobic agent, a scrap-carrying agent and a bionic shale inhibitor. The present invention uses the theory of bionics and the theory of a downhole rock surface being double phobic as a basis. By means of using the bionic wall-fixing agent, the bionic lubricant, the super dual-phobic agent, the scrap-carrying agent and the bionic shale inhibitor, which have special properties of imitating animals and plants in nature, and using a series of bionic treatment agents, a set of bionic and dual-phobic drilling fluid systems, which corresponds to an unconventional, complex oil and gas well, is formed.

Disclosed herein is a composition of matter and method of use for wireline operations in the oil/gas industry. A glycerin water base composition having optional additives, was found to yield a tacky mixture stable to temperatures up to about 195° C. and as low as −50 C. When used as a wireline fluid, the inventive composition formed a seal from the oil or gas inside or outside the wellbore. The composition can be used in downhole (and serve as a lubricant) or above hole (and serve as a sealant) operations. When the composition contains corrosion inhibitors, it was found that wireline could be protected against corrosion from atmospheric conditions during storage for up to 30 days. Unlike other sealants/lubricants known in the industry, after use, the composition is easy to clean with water, wherein the water does not need further treatment prior to disposal.

Disclosed is a polymer dispersion prepared by controlled radical polymerization and a use of the polymer dispersion as a friction reducer in oil field processes.