Abstract: A method may include drilling a section of a first wellbore and casing a section of a first wellbore. The method may include lowering a downhole receiving system into the first wellbore to a first wellbore depth and drilling at least one section of a second wellbore. In addition, the method may include positioning an EM telemetry system in the at least one section of the second wellbore and transmitting an EM telemetry signal from the EM telemetry system. The method may include receiving the EM telemetry signal with the downhole receiving system.

Abstract: An artificial toolface reference system includes a power supply providing current to a ground lead and a reference lead. A ground point is coupled to the ground lead and in electrical connection with the ground. A reference wellbore includes a reference conductor in electrical connection with the ground. The reference conductor is in electrical connection with the reference lead. The reference conductor includes an uninsulated portion and an insulated portion having an insulating layer positioned thereabout. A guidance sensor positioned outside the reference wellbore includes at least one magnetometer. The power supply may be used to provide a current through the reference conductor, into the ground through the uninsulated portion, and the ground point such that a reference magnetic field is generated along the reference conductor. The guidance sensor may measure the reference magnetic field with a magnetometer. An artificial magnetic toolface may be calculated therefrom.

Abstract: The present disclosure includes a system. The system includes a current source and a ground terminal The ground terminal is electrically connected to the current source. The ground terminal is grounded at the surface of the Earth. The system further includes a reference conductor. The reference conductor is electrically connected to the current source, and the reference conductor is inserted into a reference wellbore. The system further includes a tubular. The tubular includes a tubular string electrical discontinuity, and the tubular is inserted into the reference wellbore. The tubular has a tubular bottom hole end, and the tubular is electrically conductive between the electrical discontinuity and the bottom hole end. The system further includes an electrical connection between the tubular and reference conductor between the tubular string electrical discontinuity and the tubular bottom hole end.

Abstract: The invention is directed to methods, kits and compositions using specially designed nucleic acid components for efficient assembly of a DNA construct. The method involves a) incubating a support with a first form of nucleic acid components under conditions to form support-bound nucleic acid component complexes; b) removing unbound first form nucleic acid components; c) incubating the support-bound first form nucleic acid component complexes with a second form of nucleic acid components under conditions to anneal and link the second form to the first form; d) removing unbound second form nucleic acid components; e) repeating steps c) and d) until the DNA construct is generated; and f) eluting the DNA construct from the support. The first and second forms of the nucleic acid component comprise sticky ends such that each form cannot link to itself but can link to each other to form an alternating head to tail sequence.

Abstract: A device for controlling the flow of fine powders in a quantising machine includes a pinch valve in combination with a fluidiser maintaining a constant head of fluidised powder. A weigh bucket having a plurality of compartments is rotatably mountable to allow simultaneous filling and discharge. Means for delivering charges of fine powders to receivers rapidly with low change in quantity of the charge, have a power-tight system from the charge measuring means to the receiver, and means for venting the air from the receiver. Accurate net weighing machines for rapidly weighing and delivering charges of fine powders incorporate some or all of the above features in an integrated system.