摘要:
Fracturing fluids and methods of fracturing a subterranean formation using such fluids are provided. A fracturing fluid having a first pH is foamed by introducing a gas to the fluid. The fracturing fluid comprises a surfactant that facilitates formation of the foam at the first pH. The foamed fracturing fluid is subsequently pumped to the subterranean formation to fracture it. The pH of the fracturing fluid is then changed to a second pH at which the surfactant facilitates reduction of the foam. The fracturing fluid releases proppant contained in the fluid to the subterranean formation. The fracturing fluid is then allowed to flow back to the surface. It can be recycled by changing the pH of the fracturing fluid back to the first pH and adding a gas to the fluid, causing it to foam again.
摘要:
Provided herein are methods that comprise: providing a foamed cement composition that comprises a hydraulic cement, water, a gas, a foaming and stabilizing surfactant, and a fluid loss control additive comprising a copolymer; placing the foamed cement composition in a location to be cemented; and allowing the foamed cement composition to set.
摘要:
The present invention provides cement compositions that comprise water, high alumina cement, a soluble phosphate, and cement kiln dust. The cement compositions optionally may be foamed with a gas. Methods of cementing also are provided that comprise: providing the cement composition; introducing the cement composition into a location to be cemented; and allowing the cement composition to set therein. The location to be cemented may be above ground or in a subterranean formation.
摘要:
Provided herein are settable spotting compositions that comprise cement kiln dust and associated methods of use. Also provided are methods that comprise providing a settable spotting composition comprising cement kiln dust; introducing the settable spotting composition into a well bore that penetrates the subterranean formation so as to displace at least a portion of a second fluid from the well bore.
摘要:
The present invention provides settable compositions that comprise water and cement kiln dust. The settable compositions optionally may comprise an additive that comprises at least one of the following group: fly ash; shale; slag cement; zeolite; metakaolin; and combinations thereof. The settable compositions optionally may be foamed with a gas. Methods of cementing also are provided that comprise: providing the settable composition; introducing the settable composition into a location to be cemented; and allowing the settable composition to set therein. The location to be cemented may be above ground or in a subterranean formation.
摘要:
Settable compositions that comprise water, CKD, and microspheres, wherein the lightweight settable composition has a density less than about 13 pounds per gallon. Methods of cementing that comprise providing a lightweight settable composition having a density less than about 13 pounds per gallon, the lightweight settable composition comprising water, CKD, and microspheres, introducing the lightweight settable composition into a location to be cemented and allowing the lightweight settable composition to set therein.
摘要:
Well completion spacer fluids containing fibers and methods of using the spacer fluids are provided. A method of the invention for displacing a first fluid from a well bore with an incompatible second fluid comprises the following steps. A spacer fluid is placed between the first and second fluids to separate the first and second fluids and to remove the first fluid from the walls of the well bore. Thereafter, the first fluid and the spacer fluid are displaced from the well bore with the second fluid. The spacer fluid comprises water, a weighting material, a dispersing agent, a suspending agent and friction reducer and fibers. The spacer fluid containing the components mentioned above is preferably also foamed.
摘要:
Methods of using cement compositions that comprise basalt fibers in subterranean formations are provided. An example of such a method may comprise providing a cement composition that comprises water, a hydraulic cement, and a plurality of basalt fibers; introducing the cement composition into a subterranean formation; allowing the cement composition to set therein. Also provided are methods of cementing a pipe string in a well bore and methods of enhancing the compressive strength of a cement composition.
摘要:
An apparatus and method for completing an interval of a wellbore while drilling comprises a drill string (52) having a drill bit (30) mounted on the lower end thereof. A completion assembly (50) is positioned around a section of the drill string (52) such that when the wellbore (32) is extended by rotating the drill bit (30) and advancing the drill string (52), the completion assembly (50) does not rotate. The advancement of the drill string (52) and rotation of the drill bit (30) is ceased when the completion assembly (50) has reached the desired interval of the wellbore (32). Thereafter, the drill string (52) is disconnected from the drill bit (30) for retrieval to the surface leaving the completion assembly (50) and the drill bit (30) downhole.
摘要:
The present invention provides compositions of treating subterranean zones penetrated by well bores in primary well cementing operations, well completion operations, production stimulation treatments and the like. The invention includes aqueous well treating fluids comprised of water and a water soluble polymer complex fluid loss control additive. Preferred polymer complexes comprise water-soluble polymers made in the presence of hydroxyethylcellulose.