Field Experiences with Stable MulTM, A Non Damaging Micro Emulsion Used as Drilling Fluid for Heavy Oil Formations in Venezuela

1999 ◽  
Author(s):  
E. Zabala ◽  
A. Luongo ◽  
E. Parra ◽  
J. Mendez ◽  
J. Arocha ◽  
...  
Keyword(s):  
Heavy Oil ◽  
Drilling Fluid ◽  
Field Experiences ◽  
Micro Emulsion

Technical Principle of Integrated Solidification and Cementation at Cement-Formation Interface with Mud Cake to Agglomerated Cake (MTA) Method and its Oilfield Application

2011 ◽  
Vol 236-238 ◽  
pp. 2864-2867 ◽  
Author(s):  
Jun Gu ◽  
Ya Xin Yang ◽  
Li Fei Dong ◽  
Pei Zhong ◽  
Peng Wei Zhang
Keyword(s):  
Heavy Oil ◽  
Drilling Fluid ◽  
Variable Density ◽  
Cement Slurry ◽  
High Quality ◽  
Cement Interface ◽  
Well Completion ◽  
Shengli Oilfield ◽  
Mud Cake ◽  
Slurry System

The technical principle of integrated solidification and cementation at cement-formation interface (ISCCFI) with Mud Cake to Agglomerated Cake (MTA) method based on the mud cake modifier and forming agent of agglomerated cake can be divided into two steps. Firstly, add the mud cake modifier (the amount is 1 % to 3 %) to the drilling fluid before drilling the isolation section, and keep this proportion until the well completion. Secondly, prepare 3 to 4 cubic meters of prepad fluid based on forming agent of agglomerated cake before the well cementing operation. This new method doesn’t need to change oilwell cement slurry system. In order to verify the practical cementing effect of MTA method, it was applicated in 16 adjustment wells (9 conventional wells and 7 heavy oil wells) in the old area of two oilfields in China. The interpretation results of CBL/VDL (Cement Bond Logging/Acoustic Variable Density logging) show that the qualified rate of casing-cement interface and cement-formation interface is up to 100 %, and the qualified rate of cement-formation interface increased by 30 % in Shengli oilfield and the average high-quality rate of all the isolation section length at cement-formation interface reaches 90.48 % in Henan oilfield.

Identification of Winsor Type III Micro-emulsion for Chemical EOR of Heavy Oil

2014 ◽  
Author(s):  
Steve Soo-Khoon Sim ◽  
Fred Rolf Wassmuth ◽  
Jen Jiang Bai
Keyword(s):  
Heavy Oil ◽  
Type Iii ◽  
Chemical Eor ◽  
Micro Emulsion ◽  
Winsor Type Iii

Design of a Dislocation Well Pattern and Drilling of Shallow 3D Cluster Horizontal Wells for Development of Ultra Heavy Oil

2021 ◽  
Author(s):  
Peng Chen ◽  
Guobin Yang ◽  
Lei Chen ◽  
Guobin Zhang ◽  
Haochen Han ◽  
...  
Keyword(s):  
Heavy Oil ◽  
Drilling Fluid ◽  
Development Program ◽  
Horizontal Wells ◽  
Horizontal Displacement ◽  
Large Displacement ◽  
Electrical Heating ◽  
Friction Drag ◽  
Blind Area ◽  
Well Pattern

Abstract The Junin block in Venezuela was known as an ultra heavy oil belt reserved in extra shallow layers (950ft-1,380ft) with unconsolidated formations. A cluster wells platform drilling was required for the Field Development Program (FDP). Optimisation of the well pattern and drilling of shallow 3D cluster horizontal wells for development of ultra heavy oil are presented in this paper. A well pattern of hand-shape dislocation was forwarded to enhance effective recovery of heavy oil in diamond blind area. Optimisation of the casing programs and control of the well trajectories as well as other key performance drilling were designed. A strict anti-collision barrier design and operation steps were worked out to assure the drilling safety. The loss-resistance, anti-collapse, stick-stuck proof, lubrication and reservoir protection were put into considerations for the drilling fluid design. Recovery of heavy oil was enhanced by means of electrical heating system. Drilling challenges such as shallow target zones, big build-up rate, long horizontal sections, great friction drag and torques, and well trajectories control were experienced and settled. Especially the puzzles of well trajectories control in unconsolidated formations, great friction drag and torques of strings in large displacement long horizontal sections for subsequent operations, and the unstable wellbore were tackled. A typical well data revealed that the horizontal displacement vs. TVD ratio was as high as up to 4.5. The setting depth of surface casing and the determination of KOP were critical to the horizontal wells with large displacement in shallow layers. Pressurized combined drilling and casing-running by means of top drive overcame the drag and torque and achieved planned TD and casing setting depth. The use of electrical wireline heating rod increased the temperatures in and close to the wellbore, and compensated the radius heat loss and avoided viscosity increase of heavy oil so that the output was maintained and improved. It was the first time for successful drilling of shallow 3D cluster horizontal wells with ratio of horizontal displacement vs. TVD over 3.5 in heavy oil belt of Venezuela. The innovative palm-shape dislocation of the well pattern design satisfied the demand of reservoir development and contributed to good production gain of heavy oil.

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