Abstract: A system for blending cement and at least one additive during a blending job to create a cement slurry for use in an underground hydrocarbon well includes a mixing tub, at least first and second blenders and a rotatable platform upon which the blenders are mounted. Each blender includes at least one elongated, rotatable, mixing blade extending into the tub to mix the cement and at the additive(s) to form the cement slurry.

Abstract: Various illustrative embodiments of a cement composition for use in subterranean formations are disclosed. The cement composition can comprise water and cement. The cement powder can be mixed with water on-site to create a cement slurry or mixed with water off-site and transported to the well site. The cement composition can be pumped into the subterranean formation and allowed to penetrate the formation. For example, the cement slurry can be pumped into the wellbore, such as into the annulus, to displace fluids in the wellbore and replace them with cement.

Abstract: A system for blending cement and at least one additive during a blending job to create a cement slurry for use in an underground hydrocarbon well includes a mixing tub, at least first and second blenders and a rotatable platform upon which the blenders are mounted. Each blender includes at least one elongated, rotatable, mixing blade extending into the tub to mix the cement and at the additive(s) to form the cement slurry.

Abstract: A multi-function testing apparatus contains a test cell, a piston positioned within the test cell and an adjustable piston depth-setting rod. The testing apparatus may be used to assess carbon dioxide resistance and hydraulic bonding strength of a set cement as well as to evaluate the self-healing capabilities of a set cement. Testing on the set cement may be conducted at simulated downhole conditions.

Abstract: An apparatus for determining shear bond strength of a cement to be set within a wellbore penetrating a subterranean formation consists of a housing, a vertical rod which extends from the uppermost portion of the housing through the lowermost portion of the housing, a base plate for positioning onto the bottom of the housing and for supporting the lowermost portion of the vertical rod, and a test plate for positioning onto the top of the housing through which the uppermost portion of the vertical rod extends. The apparatus may further contain a push rod. Shear bond strength is determined by introducing into the housing a sample core of the formation prior to introduction of a slurry containing the cement. The force required to break the bond between the vertical rod and the set cement may be used to determine the shear strength between the casing within the wellbore and the set cement when the cement is hardened within the wellbore.

Abstract: An apparatus for determining shear bond strength of a cement to be set within a wellbore penetrating a subterranean formation consists of a housing, a vertical rod which extends from the uppermost portion of the housing through the lowermost portion of the housing, a base plate for positioning onto the bottom of the housing and for supporting the lowermost portion of the vertical rod, and a test plate for positioning onto the top of the housing through which the uppermost portion of the vertical rod extends. The apparatus may further contain a push rod. Shear bond strength is determined by introducing into the housing a sample core of the formation prior to introduction of a slurry containing the cement. The force required to break the bond between the vertical rod and the set cement may be used to determine the shear strength between the casing within the wellbore and the set cement when the cement is hardened within the wellbore.

Abstract: A multi-function testing apparatus contains a test cell, a piston positioned within the test cell and an adjustable piston depth-setting rod. The testing apparatus may be used to assess carbon dioxide resistance and hydraulic bonding strength of a set cement as well as to evaluate the self-healing capabilities of a set cement. Testing on the set cement may be conducted at simulated downhole conditions.

Abstract: Cement compositions containing an expandable material are disclosed. The compositions are suitable for use in oil and gas wells. An example of such an expandable material is a polymer encapsulated chemical that expands upon heating. Examples of cement compositions containing polymer encapsulated isobutane or isopentane are disclosed. The use of cement compositions containing an expandable material can reduce the formation of micro-annulus or other deleterious physical properties in the set cement.

Abstract: An apparatus for measuring volumetric changes in cement as the cement is exposed to pressures and temperatures to simulate down-hole conditions, in a high-pressure high-temperature chamber is described. The apparatus is described a mold having a first section adjacent a base and a second section movably attached to the first section and adjacent the base in which cement may be placed. The apparatus includes a sensor to measure the movement of the first and second sections relative to one another in response to volumetric changes in the cement. Also described is a method of measuring the volumetric changes in cement as the cement is exposed to simulated down-hole pressures and temperatures in a high-pressure, high-temperature chamber.

Abstract: An apparatus for measuring volumetric changes in cement as the cement is exposed to pressures and temperatures to simulate down-hole conditions, in a high-pressure high-temperature chamber is described. The apparatus is described as a mold having a first section adjacent a base and a second section movably attached to the first section and adjacent the base in which cement may be placed. The apparatus includes a sensor to measure the movement of the first and second sections relative to one another in response to volumetric changes in the cement. Also described is a method of measuring the volumetric changes in cement as the cement is exposed to simulated down-hole pressures and temperatures in a high-pressure, high-temperature chamber.

Abstract: An apparatus for measuring volumetric changes in cement as the cement is exposed to pressures and temperatures to simulate down-hole conditions, in a high-pressure high-temperature chamber is described. The apparatus is described a mold having a first section adjacent a base and a second section movably attached to the first section and adjacent the base in which cement may be placed. The apparatus includes a sensor to measure the movement of the first and second sections relative to one another in response to volumetric changes in the cement. Also described is a method of measuring the volumetric changes in cement as the cement is exposed to simulated down-hole pressures and temperatures in a high-pressure, high-temperature chamber.

Abstract: Cement compositions containing an expandable material are disclosed. The compositions are suitable for use in oil and gas wells. An example of such an expandable material is a polymer encapsulated chemical that expands upon heating. Examples of cement compositions containing polymer encapsulated isobutane or isopentane are disclosed. The use of cement compositions containing an expandable material can reduce the formation of micro-annulus or other deleterious physical properties in the set cement.

Abstract: Cement compositions for cementing wellbores in cold environments. The cement compositions may include a mixture of a reactive aluminum silicate, aluminum sulfate and hydraulic cement, and may include one or more other additives. The cement compositions may be formulated to have reduced heat of hydration as compared to conventional cements, making them suited for cementing in permafrost environments. The cement slurries may optionally be foamed using a foaming agent and energizing phase.

Abstract: An apparatus for measuring volumetric changes in cement as the cement is exposed to pressures and temperatures to simulate down-hole conditions, in a high-pressure high-temperature chamber is described. The apparatus is described as a mold having a first section adjacent a base and a second section movably attached to the first section and adjacent the base in which cement may be placed. The apparatus includes a sensor to measure the movement of the first and second sections relative to one another in response to volumetric changes in the cement. Also described is a method of measuring the volumetric changes in cement as the cement is exposed to simulated down-hole pressures and temperatures in a high-pressure, high-temperature chamber.