South Asia ///

In situ combustion delivers results

An EOR method involving injection and ignition of compressed air in the reservoir increased the oil recovery factor threefold in India's Mehsana heavy oil belt.

Major Chinese field evaluated using combined seismic and well logging methods

In Lunnan field, an Ordovician carbonate buildup in the Tarim basin of western China, the reservoir was identified and characterized using a combination of seismic techniques and well logging methods. The seismic techniques included 3D seismic visualization and seismic attribute analyses such as coherence and root-mean-square amplitude. Well logging methods used were Formation Micro-Imaging (FMI), Electric Micro-Imaging (EMI) and Dipole Sonic Imaging (DSI). The research indicated that the Lunnan Ordovician buried hill is an oil-producing reservoir that developed under the unconformity, with a thickness of 0-150 m. The slope of the buried hill was determined to be the best location for development of the reservoir. Using the above methods, the exploration success rate was increased by 117%, and crude oil production increased to over 300 times its pre-characterization rate. The reservoir characterization also enabled a major upward re-evaluation of Lunnan field’s in situ resources.

Plugging agents add value to EOR operation

Adding chemical oil-displacement agents to steam flooding treatment has recently become a common Enhanced Oil Recovery (EOR) method. However, the significant reservoir heterogeneity in Xinjiang heavy oil reservoir has resulted in steam channeling, which may allow the injected chemicals to move to the producing well while bypassing the pay zone with high oil saturation. This has led to poor utilization efficiency and sweep efficiency of the chemicals. A new technique uses plugging agents to block the steam channels before injecting the oil-displacement chemicals. This helps to expand the sweep range of chemicals to the untouched area, improving recovery. After promising laboratory results were obtained, the method was applied to the 314 wells in regions 9(4) and 9(5) of Xinjiang field. Of these, 213 experienced increased oil production, totaling about 247,600 bbl (36,650 metric tons) over 7 yr, as well as an average reduction of more than 3% in watercut.

Successful identification of depleted sands using formation testing while drilling

For some applications, this method has proved to be a safe, effective alternative to wireline testers.

Permanent downhole temperature sensing succeeds for low cost wells

Several low-cost DST wells have been successfully installed in Brunei.

Coiled Tubing Technology: Coordinating a coiled-tubing intervention campaign

Planning and executing multi-well acid stimulations produced a high success rate across Asia-Pacific.

What's new in exploration

Predicting earthquakes: Geothermal energy revisited

United States: US rotary rigs

US rig count continues to defy gravity

What's new in exploration

Methane hydrates offshore India; Noteworthy finds

New rig designs: Chinese land rig uses ac drawworks

Vol. 227 No. 12  New rig designs Chinese land rig uses ac drawworks Last year, SPA China National Petroleum Corp mobilize

Controlling high fines production in high-volume gas wells

Laminated sands were controlled with a unique openhole gravel pack.

Floatover installation succeeds for Nan Bao 35-2 topsides

A challenging float-over project paves the way for additional installations.

What's new in production

China's thirst for oil prompts an expansive search

What's new in production

Sakhalin showing its promise

Netherlands: Bunga Raya E platform installed by semisubmersible heavylift ship

Deepwater Technology: Understanding wax problems leads to deepwater flow assurance solutions

Pigging and treating rules-of-thumb are derived from lab interpretation

International Politics

CNOOC's exploits illustrate the fungible vs. security argument

Unconventional coiled tubing operation restores a Brunei offshore well

Faced with a seized gate valve in the closed position, the operator employed a pioneering milling operation to restore health to an offshore well.

What's new in exploration

Weird earth science

Articulated tug-barge shuttle provides shallow water transportation

An effective solution handles needs in China's Bohai Bay

Understanding downhole vibration transmission and disruption

Data from dual downhole sensors indicate that successful vibration mitigation was achieved in three Gulf of Thailand wells, improving BHA component life.