摘要:
During directional drilling operation, in order to achieve the correct angle and direction when drilling through a soft formation, a plug of a non-conventional cement is set across the zone in order to achieve the desired course and target. The non-conventional cement is preferably blast furnace slag and a water base drilling fluid.
摘要:
The present invention is a method to cement a wellbore in the presence of carbon dioxide, or when the wellbore will subsequently be exposed to carbon dioxide. The wellbore is cemented using a blast furnace slag cement slurry, and the resulting set cement is considerably less susceptible to degradation by carbon dioxide.
摘要:
A universal fluid which includes a water-based drilling mud and a hydraulic material is used to drill a borehole and lay down settable filter cake. After drilling is completed, the filter cake and universal fluid are caused to solidify in selected parts of the borehole by admixing the universal fluid with an activator.
摘要:
A method for installing piles in offshore waters using a drill and grout technique. The method utilizes a drilling fluid for drilling the borehole for the pile that forms a cementitious filter cake on the borehole wall and a cement for grouting the pile that is compatible with both the filter cake and salt water.
摘要:
The thermal stability of hardened drilling mud-concrete is improved by incorporating blast furnace slag, microfine slag or fine ground glass into the mud-concrete prior to hardening.
摘要:
A wellbore is drilled utilizing an oil-in-water emulsion drilling fluid, optionally containing blast furnace slag. A compatible cementitious slurry containing blast furnace slag and an activator system is then introduced into the borehole and displaced up into an annulus. Generally, the cementitious slurry is prepared by adding additional blast furnace slag and an activator such as a sodium hydroxide/sodium carbonate mixture to the used drilling fluid.
摘要:
A method of cementing a casing in a wellbore is provided wherein a cement slurry is placed in the wellbore prior to inserting the casing into the wellbore. Voids in the resultant cement caused by poor centralization are eliminated by placement of the cement in the wellbore prior to insertion of the casing.
摘要:
A drilling fluid is diluted and a cementitious component added thereto. In a more specific embodiment the dilution is carried out by introducing liquid such as water to a flowing stream of the drilling fluid and thereafter a cementitious component is mixed therewith. Thus, the drilling fluid can be used in a conventional manner to drill a well and thereafter diluted and a cementitious component added to produce a cement for cementing operations such as setting a casing in the well and/or can be used for remedial cementing.In another embodiment of the invention, the drilling fluid itself contains a small amount of cementitious component and additional cementitious component is added after the dilution.
摘要:
A method to cement wellbores in salt formations is provided using a cement slurry composition comprising blast furnace slag, water and salt. The salt improves compressive strength of blast furnace slag based cements. This method is useful in cementing wellbores within salt and potash formations because salt saturated cement slurries can be prepared without the need for expensive additives.
摘要:
A composition suitable for drilling and cementing comprising blast furnace slag, water, a soluble polyalcohol and an insoluble polyalcohol, the components of the drilling fluid being chosen so as to have a dual functionality in promoting the drilling fluid and thereafter in being functional constituents of a cementitious slurry.