Abstract: A test cell for testing a sample cement composition includes a test chamber and a variable stress system. The test chamber is configured to hold a sample cement composition for a wellbore. The variable stress system communicates with the test chamber. Performance of the sample cement composition is tested for a wellbore using the variable stress system.

Abstract: The present invention is directed to a system and method for mixing a fluid comprising water and at least one non-aqueous material. The system comprises a mixing tub and mixing head adapted to inject the fluid into the mixing tub. It also includes a plurality of lines connected to the mixing head that supply the mixing head with water and the at least one non-aqueous material and a recirculation circuit that delivers the fluid from the mixing tub back to the mixing head. The system further includes a sensor connected to the recirculation circuit that measures the concentration of water in the fluid. An automatic controller uses the concentration measurement data to control the amount of each of the ingredients injected into the mixing tub.

Abstract: A fluid loss cell has an outlet through which fluid lost during a fluid loss test flows. This outlet is connected in closed pressure communication with a fluid measuring device that senses the amount of lost fluid received in the device and generates an electrical signal representative of the sensed amount. The signal is preferably provided to a computer so that automatic monitoring of the fluid loss occurs. The fluid measuring device contains blow off pressure and subsequent increased fluid amounts. Valves and pressure regulators are included in a preferred embodiment. A related method is disclosed.

Abstract: An in-situ linear flow proppant conductivity test cell is provided which allows a downhole fracturing operation to be accurately simulated under laboratory conditions. The test apparatus includes a housing, having pistons therein, a plurality of heating elements, and a packer with a plurality of ports therethrough. Core samples are inserted into the test apparatus and a proppant bed, such as a sand slurry, is introduced into the test cell between the core samples. An external press then provides pressure to the pistons simulating the overburden experienced downhole, while the heating elements simulate downhole temperatures. Pressure, differential pressure, flow rate temperature and fluid loss characteristics can then be measured through the plurality of ports within the packer.