Abstract: A floating power generation system includes a marine vessel, an energy conversion system mounted on the marine vessel, and a fuel storage system mounted on the marine vessel. The energy conversion system includes a hydrogen fuel cell, and the fuel storage system is fluidly connected to the energy conversion system. The fuel storage system supplies hydrogen fuel to the hydrogen fuel cell of the energy conversion system.

Abstract: A wireline perforation assembly configured to be disposed in a wellbore includes one or more perforation gun subassemblies, each comprising one or more shaped explosive perforation charges configured to, when detonated, form a perforation in a wall of the wellbore. The assembly further includes shock-wave generation subassemblies, each comprising a housing and a length of detonation cord within an interior volume defined at least in part by the housing, the housing at least partially isolating the length of detonation cord from the perforation gun subassemblies and configured such that a detonation of the detonating cord within the interior volume generates shock waves and does not cause detonation of any shaped explosive perforation charges.

Abstract: A tubing hanger includes a hanger connection profile positioned along a borehole of the tubing hanger and a first landing profile positioned along the borehole and above the hanger connection profile. The first landing profile includes first threads including a first thread feature configured to secure a first check valve to the tubing hanger for isolating a production tubing. The tubing hanger further includes a second landing profile positioned along the borehole and above the first landing profile, the second landing profile including second threads including a second thread feature. The second thread feature is larger than the first thread feature and is configured to secure a second check valve to the tubing hanger for further isolating the production tubing.

Abstract: A wireline perforation assembly configured to be disposed in a wellbore includes one or more perforation gun subassemblies, each comprising one or more shaped explosive perforation charges configured to, when detonated, form a perforation in a wall of the wellbore. The assembly further includes one or more shock-wave generation subassemblies, each comprising a housing and a length of detonation cord within an interior volume defined at least in part by the housing, the housing at least partially isolating the length of detonation cord from the perforation gun subassemblies and configured such that a detonation of the detonating cord within the interior volume generates shock waves and does not cause detonation of any shaped explosive perforation charges.

Abstract: A wellbore chemical injection assembly includes an extension flange including two ends joined by a flange wall defining an inlet. The first end can fluidically couple to a tubing spool inlet of a wellhead installed at a wellbore surface. The second end can fluidically couple to a fluidic outlet of the wellhead. An extension member is attached to the flange wall at the inlet at a non-zero angle. An axial length of the extension member defines a through opening of increasing inner diameter from the inlet towards an end of the extension member. The end can be fluidically coupled to a chemical reservoir from which chemical is injected through the extension member and the extension flange into the tubing spool. Multiple valves are seated in the through opening of the extension member. The multiple valves are sized differently to seal the through opening of increasing diameter.

Abstract: A wellbore back pressure valve with pressure gauge includes a back pressure valve (BPV) that can be installed at a location in a wellbore production tubing that can be installed in a wellbore. The BPV can fluidically isolate a portion of the wellbore production tubing downhole of the location from a portion of the wellbore production tubing uphole of the location. A threaded connection is attached to a downhole end of the BPV. The threaded connection includes multiple first threads. A pressure gauge is fluidically coupled to the BPV through the threaded connection. The pressure gauge can measure a pressure in the portion of the wellbore downhole of the location.

Abstract: An assembly and method for completing a wellbore. The assembly includes a polished bore receptacle, a torque lock ring, and a left-hand threaded coupling. The torque lock ring is positioned inside the polished bore receptacle. The torque lock ring couples the polished bore receptacle to an upper completion assembly. The left-hand threaded coupling is positioned inside the polished bore receptacle. The left-hand threaded coupling receives a left-hand threaded surface of the upper completion assembly.

Abstract: A wellbore back pressure valve with pressure gauge includes a back pressure valve (BPV) that can be installed at a location in a wellbore production tubing that can be installed in a wellbore. The BPV can fluidically isolate a portion of the wellbore production tubing downhole of the location from a portion of the wellbore production tubing uphole of the location. A threaded connection is attached to a downhole end of the BPV. The threaded connection includes multiple first threads. A pressure gauge is fluidically coupled to the BPV through the threaded connection. The pressure gauge can measure a pressure in the portion of the wellbore downhole of the location.

Abstract: A wellhead includes a tubing head adapter, a tubing hanger arranged within the tubing adapter, and a dual flapper back pressure valve arranged within the tubing hanger and including an elongate body having opposing upper and lower ends, an inner flowpath defined within the body and extending between the opposing upper and lower ends, and a flapper assembly arranged within the inner flow path and including a flapper pivotably mounted to an inner wall of the inner flow path at a pivoting mechanism. When the flapper is in a closed position, the flapper forms a sealed interface with the inner wall of the inner flow path that prevents fluids from circulating through the tubing hanger and through the inner flowpath from the lower end to the upper end.

Abstract: A wellbore chemical injection assembly includes an extension flange including two ends joined by a flange wall defining an inlet. The first end can fluidically couple to a tubing spool inlet of a wellhead installed at a wellbore surface. The second end can fluidically couple to a fluidic outlet of the wellhead. An extension member is attached to the flange wall at the inlet at a non-zero angle. An axial length of the extension member defines a through opening of increasing inner diameter from the inlet towards an end of the extension member. The end can be fluidically coupled to a chemical reservoir from which chemical is injected through the extension member and the extension flange into the tubing spool. Multiple valves are seated in the through opening of the extension member. The multiple valves are sized differently to seal the through opening of increasing diameter.

Abstract: A wellbore completion system and method having a tieback string and a seal system. The tieback string includes a receptacle end defining an inner diameter larger than an outer diameter of a liner. The liner is configured to be disposed within a wellbore and defines an annulus between an external surface of the liner and a wall of the wellbore. The receptacle end is configured to be disposed within the annulus to receive a portion of the liner. The seal system is coupled to an internal surface of the receptacle end. The seal system includes an annular seal configured to swell inwardly upon contact to a wellbore fluid having an oil-based fluid to form, with the portion of the liner inserted within the receptacle end, a seal with the external surface of the liner. The tieback string is fluidly coupled, with the seal formed, to the liner to receive production fluid from the liner.

Abstract: A back pressure valve (BPV) profile cleaning tool includes a brush assembly configured to attach to a BPV rod of a BPV lubricator tool and a second magnet configured to attach to an end of the BPV rod. The brush assembly includes a brush that includes a plurality of bristles and at least one first magnet. The brush further includes an outer diameter sized for insertion into a BPV profile of a wellhead. The second magnet includes an outer diameter sized to fit through the BPV profile of the wellhead.

Abstract: Systems and methods include an importance that each of the attributes and features of the well data has on machine learning models. Well data is collected for each well in an unconventional field, including attributes and features of basin data, completion data, and production data. Spatial features are generated for each well in different regions. A combined well features dataset is generated. The dataset maps the well data to the spatial features for each well in the different regions. A training dataset and a testing dataset are generated by splitting the combined dataset. A machine learning model is trained using cross-validation and tuning on the training dataset to predict estimated ultimate recovery (EUR). The performance of a machine learning (EUR) model is evaluated with respect to different regression metrics. An importance that each of the attributes and features of the well data has on machine learning models is determined.

Abstract: A tubing hanger includes a hanger connection profile positioned along a borehole of the tubing hanger and a first landing profile positioned along the borehole and above the hanger connection profile. The first landing profile includes first threads including a first thread feature configured to secure a first check valve to the tubing hanger for isolating a production tubing. The tubing hanger further includes a second landing profile positioned along the borehole and above the first landing profile, the second landing profile including second threads including a second thread feature. The second thread feature is larger than the first thread feature and is configured to secure a second check valve to the tubing hanger for further isolating the production tubing.

Abstract: A wellbore chemical injection assembly includes an extension flange including two ends and defining a flange bore. The first end can be fluidically coupled to a tubing spool inlet of a wellhead installed at a wellbore surface. The second end can be fluidically coupled to a chemical reservoir from which chemical is injected through the flange bore into the tubing spool. The assembly includes a mandrel positioned within the extension flange. A portion of the mandrel resides within the flange bore, while a remainder extends out. The mandrel defines an interior opening spanning an axial length of the mandrel. Outer coupling threads formed on the mandrel can removably mate with counterpart threads in the tubing spool inlet. Inner coupling threads formed on an inner surface of a portion of the interior opening can removably mate with coupling threads on a valve assembly removably seated in the interior opening.

Abstract: A wellbore tieback system that includes a liner, a tieback string, and a seal system. The liner is disposed within a wellbore and defines an annulus between an external surface of the liner and a wall of the wellbore. The tieback string has a receptacle end that defines an inner diameter larger than an outer diameter of the liner such that the receptacle end can be disposed within the annulus to receive a portion of the liner. The seal system is coupled to an internal surface of the receptacle end. The seal system has at last one annular seal that swells inwardly to form, with the portion of the liner inserted within the receptacle end, a seal with the external surface of the liner. The tieback string is fluidly coupled, with the seal formed, to the liner to receive production fluid from the liner.