The subsurface development and well intervention teams recently completed a campaign of five production logs (PLTs) in the extended reach and highly deviated production wells of the Piltun field. The challenges of running the PLT logs were considerable: 4,000 to 7,000 m long deviated wells, complex well trajectories, long tractoring intervals, risk of tool lift due to high oil and gas rates, high wellhead pressures of ~2000 psi, harsh winter conditions, the problem of hydrate formation on the wire and in the pressure control equipment when pulling out of hole. Despite these challenges, the logs were completed safely and revealed a number of surprises about production from these multi-reservoir commingled wells.The logs revealed that major reservoir intervals, with excellent porosity and permeability development, were not flowing. Some lower completion intervals in these good quality reservoirs remained covered with completion brine and debris, while selective zones with high GOR development had dominated production from the wells. Prior to this learning, the team assumed production from the wells had followed a rate distribution profile matching permeability thickness (kh) distribution. The logs also revealed off-depth perforations in some cases, which may have contributed to productivity issues for those reservoirs.

No abstract

The article presents the results of theoretical calculating the parameters of a corona discharge when protecting the territory of substations from direct lightning strikes using multi-drop lightning protection. The parameters of the corona discharge are important when calculating the energy losses in the wires of overhead power lines in bad weather. (Research purpose) The research purpose is in developing a computational model and analyze the processes of lightning protection of a substation by placing parallel grounded cables suspended on supports that are placed outside the substation territory. (Materials and methods) The solution is based on a well-known relation for a typical dipole model of a charged thundercloud cell. (Results and discussion) The article present the calculated theoretical dependences, mathematical formulation and algorithm for numerical calculation of the two-dimensional problem that form the basis for calculating multi-wire lightning protection, as well as the calculation results of cable lightning protection of a transformer substation based on two-dimensional numerical modeling and comparison of the results of calculations using analytical expressions with the results of two-dimensional numerical modeling. Despite the noticeable difference between the limit currents calculated by different methods, the difference between the average current between them is small compared to the currents themselves, so one can use its arithmetic mean to determine the actual current. (Conclusions) The obtained results allow to take into account changes in the parameters of the corona formed in the electric field of a thundercloud along its cable length due to its sag, since such changes in the input parameters have a noticeable effect on the corona process, in some cases it is more significant than the effect associated with the actual sag of the cables.

Результаты промыслового каротажа в скважинах с совместной эксплуатацией нескольких горизонтов на Пильтунском участке Пильтун-Астохского месторождения заставляют пересмотреть схему разработки и внедренить интеллектуальные скважины Андре Де Вит, Алексей Яковлев, Общество инженеров-нефтяников, Майк Самроу, Общество инженеровнефтяников, Оксана Уразовская, Андрей Белоногов, «Сахалин Энерджи Инвестмент Компани Лтд.» Авторское право 2011 г., Общество инженеров нефтегазовой промышленности Этот доклад был подготовлен для презентации на Конференции SPE по разработке месторождений в осложненных условиях и Арктике 18-20 октября 2011 года в Москве, Россия.Данный доклад был выбран для проведения презентации Программным комитетом SPE по результатам экспертизы информации, содержащейся в представленном авторами реферате. Экспертиза содержания доклада Обществом инженеров нефтегазовой промышленности не выполнялась, и внесение исправлений и изменений является обязанностью авторов. Материал в том виде, в котором он представлен, не обязательно отражает точку зрения SPE, его должностных лиц или участников. Электронное копирование, распространение или хранение любой части данного доклада без предварительного письменного согласия SPE запрещается. Разрешение на воспроизведение в печатном виде распространяется только на реферат объемом не более 300 слов; при этом копировать иллюстрации не разрешается. Реферат должен содержать явно выраженную ссылку на авторское право SPE.