Meng, Xiangjuan (PetroChina Tarim Oilfield Company) | Pan, Zhaocai (PetroChina Tarim Oilfield Company) | Chen, Defei (PetroChina Tarim Oilfield Company) | Su, Zhou (PetroChina Tarim Oilfield Company) | Wang, Peng (PetroChina Tarim Oilfield Company) | Liu, Ju (PetroChina Tarim Oilfield Company) | Shen, Jianxin (PetroChina Tarim Oilfield Company) | Cao, Xianping (PetroChina Tarim Oilfield Company) | Bai, Xiaofei (PetroChina Tarim Oilfield Company)
Casing failure probability is high in Tarim Oilfield, due to high pressure high temperature and high sality operational environment, near 6% of total wells were damaged during their production life, which has serious impacts on the development well pattern, resulting in unbalanced injection-production. Based on the analysis of the situation and distribution of casing damage in the Tarim Oilfield, which located in northwest of China, was discovered in 1989, Its production formation has unwanted characteristics of high temperature (150 C) and high salinity (250000mg/L), in order to treatment the casing damage wells, a new type of chemical plugging agent named LTTD was synthesized on the basis of LTSD and its resistance to acid, temperature and salinity were carried out by experiments to evaluate the property of new chemical plugging agent. The plugging strength of LTTD and G-grade cement solidified body in different periods was studied by simulating the actual conditions of Tarim Oilfield, the mechanical properties of adhesive interface between LTTD and G-grade cement under dynamic condition were evaluated and microscopic observation of adhesive interface under dynamic condition were carried out. The experimental results show that the new plugging agent is characterized by marked improvement of performance and the enhanced resistance to acid, high salinity and high temperature conditions, moreover the formation of "the interpenetrating network structure" with high pressure bearing capacity in short time. In the actual condition of Tarim Oilfield, the plugging strength of LTTD plugging increase with the increase of temperature, which is higher than the strength of G-grade cement, during dynamic process, LTTD plugging is superior to G-grade cement in less amount of dissolution of calcium in hydration process and in better anti-channeling performance. Microscopic observation shows that both the inner and the bonding surfaces of the LTTD blocking agent have compact microstructure, which could effectively avoid the excessive formation of hydration product on bonding interface, and could produce hydration products against erosion, with strong self-healing ability and improve plugging quality. Field tests show that not only repair casing damage successfully, but also promote the oil production. Therefore, the development of new plugging agent can improve the ultimate recovery of Tarim oilfield.
Guedes, Carlos Eduardo (Schlumberger) | Benavides, Marcia (Schlumberger) | Baumann, Carlos (Schlumberger) | Garcia-Osuna, Fernando (Schlumberger) | Aboelnaga, Sharif (Schlumberger) | Zaouali, Zouhir (Schlumberger) | Al Rasbi, Said (Schlumberger) | Smart, Moises (Schlumberger)
This paper presents field results of the first well perforating system integrated with a depth correlation and real time high-speed measurements device, this tool acquires and transmits downhole data to surface in real time while perforating. The docking gun system with plug-in design improves operational safety, efficiency and reliability, whereas downhole measurements help to obtain maximum well productivity by providing real-time downhole wellbore pressure, transient dynamic underbalance and/or overbalance for perforation cleanup and/or well stimulation.
The new perforating system consists of two main components: a docking gun system and an advanced measurements module. The docking gun system consists of a compact, plug-in, radio frequency safe, addressable firing system for single and multi-zone sequential perforating applications. The system eliminates port plugs and wellsite arming of detonators, reducing human error and improving overall safety, efficiency, and reliability. The advanced measurements module provides high-frequency transient wellbore pressure, peak acceleration amplitude, and low frequency pressure, temperature, gamma ray, and active casing collar locator. These measurements enable real time confirmation of downhole conditions before, during, and after perforating, with accurate depth correlation even in high chrome tubulars and large casing sizes.
This instrumented docking gun system delivered an outstanding field performance, adding value to operators by increasing safety, efficiency and reliability, while at the same time maximizing productivity. This instrumented gun system can be deployed with wireline, tractor or electrical coil tubing. The new docking gun system design reduces human error and the risk of wellsite accidents and failures. With this system we also maximize gun length deployment per run and operational efficiency. In addition, real time downhole measurements of low- and high-frequency wellbore pressure allow optimization of perforating cleanup and stimulation, maximizing productivity and reducing the overall cost per barrel produced.
Total is determined to push ahead with its plans to drill for oil in the Amazon basin, it said on 1 June as Greenpeace activists interrupted its annual general meeting in protest over the project. An audit of the Martin Linge project was conducted by the Petroleum Safety Authority Norway (PSA) on 28–30 March 2017. This was directed at technical safety, electrical equipment, maintenance management, and Total’s own follow-up of technical barriers during the commissioning phase.
Total is determined to push ahead with its plans to drill for oil in the Amazon basin, it said on 1 June as Greenpeace activists interrupted its annual general meeting in protest over the project. This paper provides a broad overview of the Great Amazon Reef System based on the first-ever video surveys of the region.
Tariq, Zeeshan (King Fahd University of Petroleum and Minerals) | Mahmoud, Mohamed (King Fahd University of Petroleum and Minerals) | Abdulraheem, Abdulazeez (King Fahd University of Petroleum and Minerals) | Al-Nakhli, Ayman (Saudi Aramco) | Bataweel, Mohammed (Saudi Aramco)
The enormous resources of hydrocarbons hold by unconventional reservoirs across the world along with the growing oil demand make their contributions to be most imperative to the world economy. However, one of the major challenges faced by oil companies to produce from the unconventional reservoirs is to ensure economical production of oil. Unconventional reservoirs need extensive fracturing treatments to produce commercially viable hydrocarbons. One way to produce from these reservoirs is by drilling horizontal well and conduct multistage fracturing to increase stimulated reservoir volume (SRV), but this method of increasing SRV is involved with higher equipment, material, and operating costs.
To overcome operational and technical challenges involved in horizontal wells multistage fracturing, the alternative way to increase SRV is by creating multiple radial fractures by performing pulse fracturing. Pulse fracturing is a relatively new technique, can serve as an alternative to conventional hydraulic fracturing in many cases such as to stimulate naturally fractured reservoirs to connect with pre-existing fractures, to stimulate heavy oil with cold heavy oil production technique, to remove condensate banking nearby wellbore region, and when to avoid formation damage near the vicinity of the wellbore originated due to perforation. Pulse fracturing is not involved with injecting pressurized fluids into the reservoir, so it is also a relatively cheaper technique.
The purpose of this paper is to present a general overview of the pulse fracturing treatment. This paper will give general idea of the different techniques and mechanisms involved in the application of pulse fracturing technique. The focus of this review will be on the comparison of different fracturing techniques implemented normally in the industry. This study also covers the models developed and applied to the simulation of complex fractures originated due to pulse fracturing.
Production growth in the Permian Basin requires drill rigs running at a high pace. That is challenging companies to push well productivity. The struggle to overcome the challenge of frac hits has led to a critical dialogue about which pathway the shale sector should take. One idea is to simply put the problem at the center of every major decision. Using drilling data and a downhole acoustic signal, developers aim to assess unconventional fracture networks in real time and give engineers ability to customize each stage.
In need of an exploration boost, Norway doled out a record 83 production licenses in mature areas of the Norwegian Continental Shelf to 33 firms. Well RXY is located in Cairn’s Ravva offshore field in the Krishna-Godavari Basin in India. One goal for the field was significant crude production by means of a secondary reservoir section. This paper presents technologies and best practices to improve oil recovery in mature fields through waterflooding optimization. These technologies have proved practical and cost-effective.
Researchers at two California universities are studying the fiery flares that pock-mark drilling sites in the Eagle Ford Shale of south Texas. Among the most consequential provisions is the permanent reauthorization of the Land and Water Conservation Fund, a federal program established in the 1960s that uses fees and royalties paid by oil and gas companies drilling in federal waters to pay for onshore conservation programs. Global climate concerns, amplified in the public consciousness by a steady stream of violent weather events such as hurricanes and California wildfires, are generating a new set of realities for the energy industry. A Florida appeals court has approved exploratory oil drilling in the Everglades, prompting worries about Miami’s water supply and risks to the wetland ecosystem. Kentucky lawmakers have introduced House Bill 199 to plug orphaned oil and gas wells and abandoned storage tanks that threaten health, safety, and the environment. A bipartisan group of House lawmakers introduced legislation that would ban oil and natural gas drilling in Alaska’s Arctic National Wildlife Refuge. Chevron plans to set greenhouse gas emissions targets and tie executive compensation and rank-and-file bonuses to the reductions, the oil major said in its latest climate report.
Models were developed for these wells for future water-production prediction and a spatial analysis was also conducted. This study summarizes hydrate-inhibition practices for these sea lines, and indicates a possibility of using them as indirect thermometers to provide important physical oceanographic data. Results of the experimental and numerical heat-transfer analysis conducted on a T-shaped acrylic-glass pipe, representing a production header in a subsea production system with a vertical deadleg. Oily waste, is an intrinsic byproduct of the oil and gas industry and thermal desorption units with an odor-treatment system can bring technical and economic advantages to the user. The Hail 3D transition-zone seismic survey carried out by ADNOC is located in a UNESCO world-biosphere reserve. Effective environmental and ecological management throughout the project was attained through working procedures and monitoring programs. The understanding of solid-particle flow regimes in pipelines for any operational conditions is important for identifying the nature of particle interaction and movement. In this paper, a comprehensive analysis of solid-particle flow regimes in stratified flow in a horizontal pipeline is presented.