Overcoming Excessive Fluid Loss in Tip-Screen-Out Stimulations of Depleted, High-Permeability Reservoirs Using a New-Generation Viscoelastic Fluid: Successful Case Histories in West Venezuela

2009 ◽  
Author(s):  
Pablo Alejandro Parra ◽  
Emilio Miquilena ◽  
Alfredo Eduardo Sanchez ◽  
Alejandro Andres Pena ◽  
Argenis Gerardo Garcia ◽  
...  
Keyword(s):  
Viscoelastic Fluid ◽  
Fluid Loss ◽  
High Permeability ◽  
Case Histories ◽  
Successful Case ◽  
New Generation

Durability of Lightweight Slurries for Oilwell Cementing

2016 ◽  
Vol 711 ◽  
pp. 203-210
Author(s):  
Vivian Karla Castelo Branco Louback Machado Balthar ◽  
Romildo Dias Toledo Filho ◽  
Eduardo de Moraes Rego Fairbairn ◽  
Cristiane Richard de Miranda
Keyword(s):  
High Performance ◽  
Mechanical Performance ◽  
Triaxial Compression ◽  
Free Fluid ◽  
Fluid Loss ◽  
High Permeability ◽  
Acid Attack ◽  
Loss Resistance ◽  
Strength Tests ◽  
Compressible Packing Model

In a deepwater environment, unconsolidated formations at seabed and naturally fractured carbonates at reservoir zones with high permeability are commonly found. In this context, the use of lightweight slurries is necessary to effectively cementing these formations, in order to mitigate slurry losses to the formations and to prevent their fracture. This work investigates the mechanical properties and durability of high performance lightweight slurries to be used in this environment. The mixtures were formulated within the framework of the Compressible Packing Model and were extended using hollow ceramic or glass microspheres. Tests were carried out to determine the slurries apparent density, rheology, free fluid, sedimentation, fluid loss, resistance to acid attack, sorptivity and total water absorption. A mechanical characterization was performed by uniaxial and triaxial compression and splitting tensile strength tests and were correlated with the durability tests. The reference slurry, extended with bentonite, presented a 1.46 g/cm3 density and compressive strength of 3 MPa (cure at 27oC/ 2.7 days). The slurries containing glass and ceramic microspheres were slightly lighter and presented a higher mechanical performance as compared to ordinary slurry. Besides, these mixtures presented a higher resistance to acid attacks and lower sorptivity, especially the lightweight slurry containing ceramic microspheres.

Well Cutting Without Explosives with Multiple Cuts on a Single Run

2021 ◽  
Author(s):  
Hanan Ghannam ◽  
Houssam Mourani ◽  
Brian Joseph Schwanitz
Keyword(s):  
Drill Pipe ◽  
Case Histories ◽  
Critical Part ◽  
Coiled Tubing ◽  
Electric Line ◽  
New Generation ◽  
Deviated Wells

Abstract Pipe cutting operations are often a critical part of stuck pipe situations, well interventions and plug and abandon operations which all need to remove cut sections of pipe from the well. Unlike traditional ‘blade’ style e-line cutters, which can jam under pipe compression or explosive pipe cutters, which need to dress-over the jagged cut by the rig, a new electric line mechanical cutter's unique design enables performance even if the pipe is under compression, in tension or is neutral. It can also perform multiple cuts in the same run, while creating a clean and machined cut with tool-entry friendly shape. This paper will describe the technology of the new generation cutter, present two case histories; one of multiple cuts of stuck drill pipe, per each run in hole, from Germany and one of a critical tubing cut from a subsea well in Nigeria, using electric wireline and tractor conveyed services for many tasks traditionally performed with coiled tubing in highly deviated wells. These "light vs heavy" solutions can often be done off-line from the rig.

Regenerating Northern Red Oak: Three Successful Case Histories

1989 ◽  
Vol 6 (4) ◽  
pp. 174-178 ◽  
Author(s):  
Paul S. Johnson ◽  
Rodney D. Jacobs ◽  
A. Jeff Martin ◽  
Edwin D. Godel
Keyword(s):  
Present Status ◽  
Red Oak ◽  
Northern Red Oak ◽  
Case Histories ◽  
The Third ◽  
Regeneration Period ◽  
Successful Case ◽  
Competition Control ◽  
Final Harvest

Abstract This report documents the histories and present status of three young northern red oak stands in southwestern Wisconsin. Two of the stands, one 11 and one 17 years old, originated under two variations of the shelterwood system; the third, an 11-year-old stand, originated from a clearcut that was treated with an herbicide before final harvest. Among the three stands, the herbicide-treated clearcut had the greatest stocking of red oak with nearly 1,000 stems/ac 1 in. dbh and larger; the two shelterwoods averaged less than half that number. Nevertheless, each stand currently appears to be stocked with enough northern red oak to eventually dominate the stand. The abundance of red oak in the herbicide-treated clearcut suggests that the key to regenerating red oak may be competition control and not necessarily a long regeneration period. North. J. Appl. For. 6:174-178, December 1989.

Developing New Generation of Environmentally Friendly Nano Based Low Saline Water-Based Drilling Fluid

2021 ◽  
Author(s):  
Mojtaba Kalhor Mohammadi ◽  
Shervin Taraghikhah ◽  
Mohammad Saeed Karimi Rad ◽  
Koroush Tahmasbi Nowtaraki
Keyword(s):  
Potassium Chloride ◽  
Sodium Salt ◽  
Salt Concentration ◽  
Saline Water ◽  
Drilling Fluid ◽  
Fluid Loss ◽  
Water Based ◽  
New Generation ◽  
Chloride Salts ◽  
Sodium And Potassium

Abstract Developing high-performance environmentally friendly drilling fluids is always a requirement by oil and gas operators to reduce the waste management associated cost with the drilling fluid treatment and disposal. Conventional water-based drilling fluid is formulated with the brine-based polymer which consists of sodium and potassium chloride salts to improve the performance of the polymer and also providing clay inhibition in reactive clay and shale. This paper describes the development of nanotechnology-based drilling fluid to replace salt from the conventional application. Nano Based Low Saline Water Based Mud (NBLS-WBM) was formulated and developed based on laboratory experiments. Different nano additives with different concentrations were evaluated and the optimum concentration was selected to reduce the sodium and potassium chloride salts concentration to almost zero. The rheological properties and fluid loss were measured according to the API standard before and after hot rolling. Also, HPHT fluid loss, lubricity, and shale inhibition were evaluated. All the results were compared with sodium salt-saturated and potassium-based polymer muds. Laboratory evaluation of NBLS-WBM indicated that sodium salt concentration can be reduced considerably up to 5% W/V and potassium chloride can be eliminated by adding 1% W/W of nano additive. The rheological properties including plastic viscosity and yield point were constant and stable after hot rolling 16 hours at 250 °F. Also, Clay inhibition improved significantly up to 95% recovery comparing with conventional water-based polymer mud. Although the application of nanotechnology to improve the performance of conventional water-based drilling fluid was studied by many researchers, it is the novelty of this research to reduce the salt concentration and remove it to develop the new generation of salt-free water-based drilling fluid with economical consideration and lower environmental impact.

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