High-Temperature Wells with Lost-Circulation Demands and Reverse Circulation Placement Technique Using Foamed Cement Systems: Two Case Histories

2003 ◽  
Author(s):  
Robert Moore ◽  
Daniel L. Bour ◽  
Shawn Reed ◽  
Rafael Hernandez
Keyword(s):  
High Temperature ◽  
Case Histories ◽  
Lost Circulation ◽  
Reverse Circulation ◽  
Placement Technique

Managed-Pressure Cementing in HPHT Well with Very Narrow Operating Pressure Window

2021 ◽  
Author(s):  
David Salinas Sanchez ◽  
Mario Noguez Lugo ◽  
Oscar Zamora Torres ◽  
Cuauhtemoc Cruz Castillo ◽  
Moises Muñoz Rivera ◽  
...  
Keyword(s):  
Pore Pressure ◽  
Stopping Time ◽  
Operating Pressure ◽  
Cement Slurry ◽  
Working Pressure ◽  
Lost Circulation ◽  
Main Challenge ◽  
Fiber Technology ◽  
Open Hole ◽  
Reverse Circulation

Abstract A 7-in. liner was successfully cemented in the south east region of Mexico at 7530 m MD despite significant pressure and temperature challenges. The entire 1,370-m, 8.5" open hole section needed cement coverage and isolation to test several intervals. The challenge of the ultranarrow working pressure window was overcome by using managed pressure cementing (MPC) along with lost circulation solutions for the cement slurry and spacer. Due to the narrow pressure window (0.05 g/cc density gradient), mud losses could not be avoided during the cementing job. To limit and manage losses, an MPC placement technique was proposed, in conjunction with using lost circulation fiber technology in the cement slurry and spacer. After addressing the losses and narrow working pressure window, the next main challenge was the extremely high temperature (Bottom hole static temperature of 171°C). Extensive lab testing provided the fluid solution: HT formulations for cement slurry and spacer to maintain stability and rheology for placement and management of equivalent circulating density and set cement properties for long-term zonal isolation. After the liner was run to bottom, the mud density was homogenized from 1.40 g/cc to 1.30 g/cc (pore pressure: 1.38 g/cc). During this process, 32.5 m3 of mud was lost to the formation. During the previous circulation, the backpressure required to maintain the equivalent circulation density (ECD) above pore pressure, which was calculated and validated resulting in 1,100 psi annulus surface pressure (close to the limit of the equipment capacity) during the stopping time. The cementing job was pumped flawlessly with only 10 m3 of mud loss at the end of the job. During reverse circulation, contaminated spacer at surface indicated no cementing fluid had been lost to the formation and adequate open-hole coverage. The liner was successfully pressure tested to 4,500 psi, and cement logs showed that the cement had covered the open hole completely. MPC is not a conventional cementing technique. After the successful result on this job and subsequent operations, this technique is now being adopted to optimize cementing in even deeper wells in Mexico, where losses during cementing operations in the past had modified or limited the whole well construction and designed completion, and production of the well.

Effect of Drilling Fluid Temperature on Formation Fracture Pressure Gradient

2021 ◽  
Author(s):  
Ahmed Mostafa Samak ◽  
Abdelalim Hashem Elsayed
Keyword(s):  
High Temperature ◽  
Pressure Gradient ◽  
Thermal Effect ◽  
Drilling Fluid ◽  
Wellbore Stability ◽  
Cooling Effect ◽  
Fluid Temperature ◽  
Lost Circulation ◽  
Fracture Pressure ◽  
Downhole Temperature

Abstract During drilling oil, gas, or geothermal wells, the temperature difference between the formation and the drilling fluid will cause a temperature change around the borehole, which will influence the wellbore stresses. This effect on the stresses tends to cause wellbore instability in high temperature formations, which may lead to some problems such as formation break down, loss of circulation, and untrue kick. In this research, a numerical model is presented to simulate downhole temperature changes during circulation then simulate its effect on fracture pressure gradient based on thermo-poro-elasticity theory. This paper also describes an incident occurred during drilling a well in Gulf of Suez and the observations made during this incident. It also gives an analysis of these observations which led to a reasonable explanation of the cause of this incident. This paper shows that the fracture pressure decreases as the temperature of wellbore decreases, and vice versa. The research results could help in determining the suitable drilling fluid density in high-temperature wells. It also could help in understanding loss and gain phenomena in HT wells which may happen due to thermal effect. The thermal effect should be taken into consideration while preparing wellbore stability studies and choosing mud weight of deep wells, HPHT wells, deep water wells, or wells with depleted zones at high depths because cooling effect reduces the wellbore stresses and effective FG. Understanding and controlling cooling effect could help in controlling the reduction in effective FG and so avoid lost circulation and additional unnecessary casing points.

Fuel Treatment Chemical Additives Progress Report

1980 ◽  
Vol 102 (4) ◽  
pp. 813-819
Author(s):  
A. E. Bischof
Keyword(s):  
High Temperature ◽  
Combustion Efficiency ◽  
High Temperature Corrosion ◽  
Progress Report ◽  
Fuel Quality ◽  
Chemical Solution ◽  
Case Histories ◽  
Chemical Additives ◽  
Fuel Use ◽  
Fuel Treatment

A detailed discussion of fuel quality as related to associated fuel use problems is presented. The generic chemical solution to the problems is covered with emphasis on the correction of system mechanical and instrumental malfunctions. Three case histories concerning high temperature corrosion, combustion efficiency and deposit accumulation are explored.

Selected Applications of High-Temperature X-Ray Studies in the Metallurgical Field

1961 ◽  
Vol 5 ◽  
pp. 191-212 ◽  
Author(s):  
H.J. Goldschmidt
Keyword(s):  
Thermal Expansion ◽  
High Temperature ◽  
Phase Transformations ◽  
Inorganic Compounds ◽  
Nonferrous Metals ◽  
Scientific Interest ◽  
Case Histories ◽  
X Ray

AbstractHigh-temperature X-ray powder photography has proved of great value in many directions in the metallurgical field. Some of the successes achieved and problems encountered by the author and other investigators using an established-type camera (British Unicam) for temperatures up to 1400°C will be discussed. This will be by way of specific case histories, chosen both for their own scientific interest and to illustrate the techniques employed. The applications concern phase transformations and the measurement of coefficients of thermal expansion in iron and steels, as well as in some nonferrous metals and inorganic compounds.

Field Case Histories: Countering Lost Circulation with Monofilament Polypropylene Fiber

2014 ◽  
Author(s):  
Samuel S. Mofunlewi ◽  
Chinyere Okeke ◽  
Abidemi Bankole ◽  
Osaze Ighodaro
Keyword(s):  
Polypropylene Fiber ◽  
Case Histories ◽  
Field Case ◽  
Lost Circulation

Designing Lost Circulation Material LCM Pills for High Temperature Applications

2016 ◽  
Author(s):  
Sandeep D. Kulkarni ◽  
Sharath Savari ◽  
Nivika Gupta ◽  
Don Whitfill
Keyword(s):  
High Temperature ◽  
Lost Circulation ◽  
Temperature Applications
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