Systems and methods for determining a time-dependent mud weight window are disclosed. The existence of fractures in formation rock along with a type of the formation rock are used to determine the use of a particular solution to determine the mud weight window at a particular time of a wellbore drilling operation.

Systems and methods for determining a time-dependent mud weight window are disclosed. The existence of fractures in formation rock along with a type of the formation rock are used to determine the use of a particular solution to determine the mud weight window at a particular time of a wellbore drilling operation.

A method and apparatus for oil and gas operations according to which a bottom hole trajectory of a drilling well is surveyed using a survey tool located uphole from a drill bit positioned at a bottom hole location. One or more offset wells are identified having a trajectory, or respective trajectories, closing on the bottom hole trajectory of the drilling well. An anti-collision steering strategy for the drilling well to avoid the one or more offset wells is determined.

A method and apparatus for oil and gas operations according to which a bottom hole trajectory of a drilling well is surveyed using a survey tool located uphole from a drill bit positioned at a bottom hole location. One or more offset wells are identified having a trajectory, or respective trajectories, closing on the bottom hole trajectory of the drilling well. An anti-collision steering strategy for the drilling well to avoid the one or more offset wells is determined.

Provided are embodiments that include identifying candidate well parameters for a hydrocarbon well that include a location, a well production rate and candidate horizontal wellbore lateral lengths for the well, conducting simulations of hydrocarbon wells located at the location and having lateral lengths corresponding to the candidate horizontal wellbore lateral lengths and operating at the well production rate to determine a gas breakthrough productivity indexes (GBPIs) for the simulated wells, determining (based on the GBPIs) a relationship of GBPI to horizontal wellbore lateral length, determining (based on the relationship) an optimized horizontal wellbore lateral length for the production rate, and developing the well based on the optimized horizontal wellbore lateral length.

Provided are embodiments that include identifying candidate well parameters for a hydrocarbon well that include a location, a well production rate and candidate horizontal wellbore lateral lengths for the well, conducting simulations of hydrocarbon wells located at the location and having lateral lengths corresponding to the candidate horizontal wellbore lateral lengths and operating at the well production rate to determine a gas breakthrough productivity indexes (GBPIs) for the simulated wells, determining (based on the GBPIs) a relationship of GBPI to horizontal wellbore lateral length, determining (based on the relationship) an optimized horizontal wellbore lateral length for the production rate, and developing the well based on the optimized horizontal wellbore lateral length.

A well tool can be used in a wellbore that can measure characteristics of an object in the wellbore. The well tool includes an ultrasonic transducer for generating an ultrasonic wave in a medium of the wellbore. The ultrasonic transducer includes a front layer, a rear layer, backing material coupled to the rear layer, and piezoelectric material coupled to the front layer and to the backing material. The rear layer can improve signal-to-noise ratio of the transducer in applications such as imaging and caliper applications.

A method can include receiving data for a borehole trajectory in a formation, a length of pipe, and a bottom hole assembly that includes a mud motor and a bit; generating a sequence for operation of the mud motor using a model of at least the bit, where the sequence includes a sliding mode and a rotary mode for drilling the borehole in the formation a distance less than or equal to the length of pipe; and drilling the borehole according to the sequence.

A method can include receiving data for a borehole trajectory in a formation, a length of pipe, and a bottom hole assembly that includes a mud motor and a bit; generating a sequence for operation of the mud motor using a model of at least the bit, where the sequence includes a sliding mode and a rotary mode for drilling the borehole in the formation a distance less than or equal to the length of pipe; and drilling the borehole according to the sequence.

Well placement systems and methods to determine well placements are disclosed. A method to determine well placement includes generating a trajectory of a target well of a wellsite. The method also includes plotting the trajectory of the target well. The method further includes determining whether an offset well has been drilled at the wellsite. In response to a determination that the offset well has been drilled at the wellsite, the method further includes determining a well path of the offset well and one or more parameters of the offset well, and plotting the well path of the offset well, wherein the well path of the offset well and the trajectory of the target well are superimposed over each other.