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Drilling Waste Treatment --- Non-landing Technology Application


Episode I  Tarim Oilfield Drilling Waste Treatment Current Situation


Drilling cuttings is the main waste produced during drilling operation, including clay, heavy material, chemical treating agent, waste water, sump oil and drilling cuttings, and the kinds of polymer, heavy metal ion, salt, pitch and other modifying substance is harmful to environment. During drilling, each well generally produces about 800m³ drilling waste fluid, the drilling cuttings has no recovery value, only be piled up at wellsite mud pit, and the environment pollution is caused by hidden dangers. During recent years, Tarim oilfield oil and gas resources developed rapidly. And with the drilling wells quantity continuous increasing, the cumulative drilling waste has been placing a growing hazard to environment pollution. According to statistical data, in year 2009, the Tarim oilfield drilling waste reached to 130,000m³, including drilling cuttings about 50,000. While in year 2010, the drilling waste reached up to 200,000. It gave great burden to the Tarim environmental governance, and there is an urgent need of drilling waste fluid treatment for this oilfield.

1 The current situation in Tarim oilfield drilling waste fluid management
1.1 Drilling waste fluid treatment method and problems
At present, the main methods for management Tarim oilfield drilling waste fluid are Burial, solidification and offsite centralized processing. According to Tarim oilfield well distribution and formation and ground surface condition, the oil and gas wells are most locating at water resources lacking area. The surface water and underground water is in high mineralization, the chloride ion is up to 40000～ 150000 mg /L, mud organization complex, oil & gas resources ares wide and large, oil & gas formation deep, reservoir large, and not centralized. From single well treating method, the treatment cost high, area coverage large, mud pit and leak proof pit construction and maintenance cost high, waste storage time long, waste fluid production capacity high, and the discharged waste water with chloride ion has great harm to the environment. Otherwise, offsite centralized treatment is high in transportation cost with high management cost and high risk to environmental pollution, and the subsidized material is hard to conducting non-harmful treatment. Many methods have been used but still can not reach to target of non-harmful to the environment.


1.2 New technology pilot experiment
Tarim oilfield has launched out a series activities to solve the problems of drilling waste fluid posed to environment. Big capital invested and positive actions launched to search the drilling fluid environmental protection means. The “drilling waste treating non-landing target processing technology” was pilot tested in well YM7-H12 in 2009 and Ha702 in 2010 separately. The testing result shows that the complete equipment can conduct timely, continuous and stable treatment to the drilling waste fluid while drilling. The treated solid waste and fluid waste can reach to national discharge standard and recovery. This technology broke down the traditional drilling waste fluids management, and realized the combination of economic and environmental benefit. It has extensive applicability to kinds of waste mud with significant advantages, which is the new trend in realizing Tarim oilfield drilling waste mud pollution hazard management. 
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