Abstract: Aspects of the subject technology relate to systems and methods for determining cement barrier quality of a cementing process. Systems and methods are provided for receiving data from a distributed acoustic sensing fiber optic line positioned proximate to cement barrier of a wellbore, determining at least one zonal isolation in the cement barrier based on the data received from the distributed acoustic sensing fiber optic line, and compiling a cement bond log based on the determining of the at least one zonal isolation in the cement barrier.

Abstract: Aspects of the subject technology relate to systems and methods for determining positions of fluids during a cementing process in real-time. Systems and methods are provided for receiving one or more sensing parameters from a distributed acoustic sensing fiber optic line positioned in a wellbore during a cementing process, determining types of fluid proximate to the wellbore based on the one or more sensing parameters received from the distributed acoustic sensing fiber optic line, determining pressure gradients of the types of fluid based on the one or more sensing parameters received from the distributed acoustic sensing fiber optic line, and compiling flow profiles for the types of fluid proximate to the wellbore based on at least one of the determining of the types of fluid and the determining of the pressure gradients of the types of fluid.

Abstract: System and methods for detecting a composition in a wellbore during a cementing operation. An electrochemical cell can be disposed towards an end of a wellbore. The electrochemical cell can generate electrical energy in response to a physical presence of a composition at the electrochemical cell. The composition can be pumped from a surface of the wellbore during a cementing operation of the wellbore. Further, a telemetry signal indicating the physical presence of the composition at the electrochemical cell can be generated based on the electrical energy generated by the electrochemical cell. As follows, the telemetry signal can be transmitted to the surface of the wellbore.

Abstract: Temperature data collected from a distributed temperature sensing system may be used to prepare a temporal thermal profile of the wellbore. The temporal thermal profile may be used to determine a generalized heat transfer coefficient (k) and/or a generalized geothermal profile (Tae). The temporal thermal profile and the generalized heat transfer coefficient (k) and/or the generalized geothermal profile (Tae) may be used to estimate thermal properties of a wellbore, such as well as fluid and flow characteristics. A heat of hydration index may also be determined based on the temporal thermal profile.

Abstract: A method for designing a cement composition may include: providing a target compressive strength and a target composition density; selecting at least one cementitious material from a plurality of cementitious materials; calculating a required amount of water to produce a cement composition with the target composition density, the cement composition comprising the water and the at least one cementitious material; calculating a compressive strength of the cement composition based at least in part on a model of compressive strength; comparing the calculated compressive strength to the target compressive strength; and preparing the cement composition with the calculated compressive strength.

Abstract: A method of cementing may include: providing a first solid particulate material; measuring at least one physicochemical property of the first solid particulate material; correlating the at least one physicochemical property of the first solid particulate material to at least one physicochemical property of a second solid particulate material and at least one physicochemical of a third solid particulate material; determining if a result of the step of correlating meets an operational parameter; and preparing a cement slurry which meets the operational parameter.

Abstract: A method of designing a cement composition may include: minimizing an objective function subject to a plurality of constraints to produce a cement composition including at least one cement component and water; and preparing the cement composition.

Abstract: A method may include: providing a model of cement temperature sensitivity; designing a cement composition, based at least partially on the model of cement temperature sensitivity; and preparing the cement composition.

Abstract: A method may include: providing a model of cement induction time; designing a cement composition, based at least partially, on the model of cement induction time; and preparing the cement composition.

Abstract: A method may include: analyzing each of a group of inorganic particles to generate data about physicochemical properties of each of the inorganic particles; and generating a correlation between a reactivity index of each of the inorganic particles and the data.

Abstract: Systems and methods for managed pressure cementing and/or completions operations in subterranean well bores are provided. In some embodiments, the methods comprise: placing a tubular string into a well bore, wherein an outer surface of the tubular string and an inner wall of the well bore define an annulus in a closed pressure loop and in communication with a choke valve; pumping a fluid into the annulus; and while pumping the fluid, determining a setpoint for the choke valve corresponding to a setpoint for a bottomhole pressure in the annulus, determine an actual bottomhole pressure in the annulus using data from a downhole sensor in the annulus, determining if the actual bottomhole pressure is greater than, less than, or equal to the setpoint, and if the actual bottomhole pressure is greater or less than the setpoint, manipulating the choke valve using a controller to decrease or increase the bottomhole pressure.

Abstract: Systems and methods for performing positive and/or negative pressure testing in managed pressure operations in subterranean well bores are provided. In some embodiments, the methods comprise: performing a positive or negative pressure test in a well bore in a subterranean formation, wherein the well bore is maintained in a closed pressure loop, and at least one choke valve is provided in communication with the well bore, the choke valve being coupled to a controller, and during the test in the well bore, monitoring an actual bottomhole pressure in the well bore using data from at least one downhole sensor in the well bore, and if the actual bottomhole pressure in the well bore increases or decreases, manipulating the choke valve using the controller to increase or decrease the bottomhole pressure in the well bore.

Abstract: A computing device can determine the integrity of a blowout preventer in a well system using a model generated from real-time sensor data. For example, the computing device can receive predetermined values associated with how pressure decays or otherwise changes in a pressurization subsystem overtime. The pressurization subsystem can be for pressurizing the blowout preventer. The computing device can also receive, from a pressure sensor, real-time pressure measurements indicating pressures in the pressurization subsystem. The computing device can generate the model based on the predetermined values and the pressure measurements. The computing device can use the model to predict the pressure in the pressurization subsystem during a future period of time. The computing device can analyze aspects of the predicted pressure in the pressurization subsystem over the future period of time to determine if the blowout preventer is functioning properly.

Abstract: The equivalent circulating density (“ECD”) in a wellbore may be managed during a wellbore operation using ECD models that take into account the rheology of the wellbore fluid and the rotational speed of tubulars in the wellbore. For example, a method may include rotating a rotating tubular in a stationary conduit while flowing a fluid through an annulus between the rotating tubular and the stationary conduit; calculating an equivalent circulating density (“ECD”) of the fluid where a calculated viscosity of the fluid is based on an ECD model ?_eff=f(? ?_eff)*h(Re), wherein ?_eff is the viscosity of the fluid, ? ?_eff is an effective shear rate of the fluid, and Re is a Reynold's number for the fluid for the rotational speed of the rotating tubular; and changing an operational parameter of the wellbore operation to maintain or change the ECD of the fluid.

Abstract: A method includes injecting a treatment fluid through a tubular in a wellbore created in a subterranean formation, wherein the treatment fluid is to return through an annulus defined between the tubular and a wall of the wellbore. The method includes logging, during the injecting, measurements comprising at least one of an actual wellhead pressure; treatment fluid inlet density, inlet flow rate, outlet flow rate, and treatment fluid inlet viscosity. The method includes determining a loss zone location in the wellbore based on the measurements.

Abstract: Systems and methods for performing positive and/or negative pressure testing in managed pressure operations in subterranean well bores are provided. In some embodiments, the methods comprise: performing a positive or negative pressure test in a well bore in a subterranean formation, wherein the well bore is maintained in a closed pressure loop, and at least one choke valve is provided in communication with the well bore, the choke valve being coupled to a controller, and during the test in the well bore, monitoring an actual bottomhole pressure in the well bore using data from at least one downhole sensor in the well bore, and if the actual bottomhole pressure in the well bore increases or decreases, manipulating the choke valve using the controller to increase or decrease the bottomhole pressure in the well bore.

Abstract: Systems and methods for managed pressure cementing and/or completions operations in subterranean well bores are provided. In some embodiments, the methods comprise: placing a tubular string into a well bore, wherein an outer surface of the tubular string and an inner wall of the well bore define an annulus in a closed pressure loop and in communication with a choke valve; pumping a fluid into the annulus; and while pumping the fluid, determining a setpoint for the choke valve corresponding to a setpoint for a bottomhole pressure in the annulus, determine an actual bottomhole pressure in the annulus using data from a downhole sensor in the annulus, determining if the actual bottomhole pressure is greater than, less than, or equal to the setpoint, and if the actual bottomhole pressure is greater or less than the setpoint, manipulating the choke valve using a controller to decrease or increase the bottomhole pressure.

Abstract: Methods of locating a loss zone in a wellbore in a subterranean formation including determining a calculated wellhead pressure, calculating a wellhead pressure differential, calculating a flow rate loss, estimating a loss zone depth, determining a modified calculated wellhead pressure, and calculating a modified wellhead pressure differential until the modified wellhead pressure differential corresponds to a loss zone location in the wellbore.

Abstract: Methods of formulating a cement slurry for use in a subterranean salt formation, including methods for formulating a cement slurry capable of providing long-term zonal isolation within a subterranean salt formation. The methods also take into account the effects of treatment fluids on the cement slurry, such as drilling fluids, spacer fluids, flush fluids, or other relevant fluids used to perform a subterranean formation operation.

Abstract: Methods of formulating a cement slurry for use in a subterranean salt formation, including methods for formulating a cement slurry capable of providing long-term zonal isolation within a subterranean salt formation. The methods also take into account the effects of treatment fluids on the cement slurry, such as drilling fluids, spacer fluids, flush fluids, or other relevant fluids used to perform a subterranean formation operation.