The aim of this paper is to compare the performance of three horizontal infill wells in a mature field, of which one is completed with autonomous inflow control devices (AICDs). The analytic results are based on the comparison of oil production rates; water cut development and water-oil ratio plots of the wells. All the wells in this study are producing from the same homogeneous sandstone reservoir.
Two of the horizontal infill wells are targeting attic oil in an area with low risk of gas production of which one of these wells is completed with slotted liners and the other with AICDs. Both are artificially lifted with high rate electrical submersible pumps (ESPs). The third horizontal well was placed in an area with higher gas saturation, where a completion with casing, cementation and perforation was used. The performance of the horizontal wells is compared against each other.
The use of active geo-steering successfully supported the well placement into the "sweet spot" of the reservoir due to real-time well path adjustments.
It was found that the AICDs choke back a high amount of fluid and keep the water cut at a stable plateau level. This observation underlines the key benefit of using AICDs as when comparing to the other producing wells without AICDs, the water cut is steadily increasing.
Therefore the use of AICDs is a real option for horizontal well completion.
This paper will be useful to those who are in a phase of early well planning, e.g. in a field (re-)development project and have to select the best well concept (e.g. slotted liner vs. AICDs). AICDs have proven their value even in a super-mature oil field by improving production. Further advantages and challenges during operation are discussed in this paper.
Japan Agency for Marine-Earth Science and Technology (JAMSTEC) operates the scientific deep-sea drilling vessel Chikyu for scientific studies on past climate changes, long-term crust transportation, biological and abiotic processes associated with hydrocarbon production, and earthquakes, the last being one of the most important research topics. Chikyu conducted the Japan Trench Fast Drilling Program (JFAST) to obtain core samples from sediment layers under the seabed for study on the large Tohoku earthquake which triggered the devastating tsunami in 2011. Chikyu has also started to conduct the Nankai Trough Seismogenic Zone Experiment (NanTroSEIZE) as the Nankai Trough is one of the most active earthquake zones. As one of the primary goals of scientific drilling is to evaluate sediment properties, it is highly beneficial to characterize the lithology of the drilling layer during drilling operations. Even an approximation of these properties could potentially provide valuable information for conducting coring operations. Thus, a previous study attempted to discuss the properties of sediment layers using surface drilling data, and estimated the shear stress of the sediment. In this study, we summarize the method applied in the previous paper for estimating the torque at the drill bit from the surface measured drilling data for NanTroSEIZE deep riser drilling operation. This data was then used to directly calculate the shear stress of the sediment. The drilling torque at the bit differed from the surface torque, where this difference increased with increasing drilling depth. Our estimations of the drilling torque were validated using torque data obtained from logging while drilling (LWD) operations. We also used machine-learning approaches to predict the lithology, where learning data was created from surface drilling data and lithology information from core samples obtained during past scientific drilling operations. Machine learning was then applied using neural network algorithms by tuning the number of layers to create a predictive model. This paper discusses the preliminary attempt to predict the lithology using machine-learning approaches for NanTroSEIZE and JFAST data.
As drilling automation has transformed from a blue sky vision to a reality, so has the industry's understanding of the depth and breadth of automation needs and opportunities. The focus is no longer solely on-bottom drilling performance but now considers the entire lifecycle of well construction. This workshop will examine the following key areas in terms of pragmatic solutions that are either available today or are coming in the near future. Individual case studies within each session will be presented that provide a foundation for what is available today, and what will be available in the near term. This workshop will bring together operators, drilling data solution experts, as well as service company and drilling contractor personnel to identify and discuss challenges to accelerating adoption of these solutions in the industry.
Understanding pressure and pressure relationships is the key to safe well control. Yet, to date, the primary focus of well control has centred on recovery rather than prevention. Incidents related to loss of well control largely occur when the primary barrier, hydrostatic pressure from the drilling fluid, fails to prevent an influx; thus requiring the secondary barrier, closing of the BOPs, to engage in order stop the breach from becoming a full-blown, well control incident. Influxes occur, most often, during the tripping operation where the swab effect lowers the bottomhole pressure below the formation's pressure and can be commonly misidentified when "wellbore breathing," nuisances gases, or cement setting are involved. Influxes can also occur when drilling into unexpected, higher-pressure zones.
Environmentalists have sued a US agency to try to stop it from allowing oil and gas drilling on a vast stretch of federal land in Nevada, where the government is reversing protections put in place 9 months ago under the Obama administration. The US Interior Department on 7 August launched an overhaul to an Obama-era plan to protect sage grouse that it says aims to preserve the species of bird while expanding opportunities for oil development in western states where they live. The federal government is barred from auctioning off new drilling rights on public lands in California for at least another year under a settlement reached with environmental groups, one of the groups told Bloomberg.
Environmentalists have sued a US agency to try to stop it from allowing oil and gas drilling on a vast stretch of federal land in Nevada, where the government is reversing protections put in place 9 months ago under the Obama administration. The Interior Department is preparing to delay implementation of a rule limiting methane waste at oil and natural gas drilling sites. The federal government is barred from auctioning off new drilling rights on public lands in California for at least another year under a settlement reached with environmental groups, one of the groups told Bloomberg.
Considering most of the rigs deal with human-machine interface systems, the role of human factors is at the heart of any successful operation. Eye-tracking technology can be useful in real-time operation centers where ocular movement data can improve the professionals’ performance. Environmentalists have sued a US agency to try to stop it from allowing oil and gas drilling on a vast stretch of federal land in Nevada, where the government is reversing protections put in place 9 months ago under the Obama administration. Two months after a Colorado home exploded near an Anadarko well, the reverberations are still rattling the oil industry, driving down driller shares and raising fears of a regulatory backlash. More than 100 members of Congress are urging the Trump administration not to open up the Atlantic or Pacific oceans for oil and gas drilling as part of the Interior Department’s review of federal offshore policies.
Safety risks of drilling operations are widespread, with potentially significant consequences. Managing these safety risks is key, and intelligent safety risk software can help. This paper introduces dynamic risk modeling and reports on a 2016 proof-of-concept demonstration of the emergent capability.
Colorado Gov. John Hickenlooper recently said the home explosion in Firestone, Colorado, that killed two people was a “freak accident.” But a new study by the Colorado School of Public Health indicates that accidents like this may not be so uncommon. The company that owns a gas well linked to a fatal home explosion in Colorado says it will permanently shut down that well and two others in the neighborhood. Anadarko Petroleum announced on its website on 16 May that it is permanently disconnecting 1-in.-diameter
A bipartisan group of House lawmakers introduced legislation that would ban oil and natural gas drilling in Alaska’s Arctic National Wildlife Refuge. The Trump administration will begin the environmental review process for oil and gas drilling on a section of the Arctic National Wildlife Refuge, a region in northern Alaska rich in crude but prized by conservationists. The Supreme Court won’t hear an appeal from Alaska and oil and gas industry groups protesting the government’s designation of more than 187,000 square miles in the state as critical habitat for threatened polar bears.