CNPC Has Achieved Several Good Record For Ultra High Density Oil-based Drilling Fluid

Case one:

On June 24, during the drilling of well #LeTan 1 in Junggar Basin, Xinjiang province, the oil-based drilling fluid provided by CNPC Chuanqing drilling company with a density of 2.65 g / cm3 , performance was perfect while they have reached to drilling footage 15 meters per day.

The operator “Xinjiang Oilfield Company and Western drilling Company” site engineer approved the operation result that :"The density is so high, but the rheology is so good ." This ultra-high density oil-based drilling fluid is the first time adopted in the field application of CNPC. From 2014, CNPC Chuanqing drilling fluid company has developed a high-temperature ultra-high density oil-based drilling fluid system with a density of 2.2~2.75 g/cm3, and have achieved several good record using in “Well# Le Tan 1” which is located in the Taxi River, Manas County, “Well # Changji Hui Autonomous Prefecture, Xinjiang, which is located in the southern margin of Junggar Basin. ( A high risky exploration well deployed in Xinjiang Oilfield).

The well was drilled by CNPC Western drilling Company, and CNPC Chuanqing drilling provided drilling fluid technical service. On June 12, the expert team of CNPC Chuanqing Company moved to “well# Le Tan 1”, according to the formation pressure coefficient and the actual pressure at the bottom of the well, the density of drilling fluid were determined for drilling in the downhole must be more than 2.65 g / cubic centimeter in order to ensure safe drilling. How to ensure excellent rheology as well to control HTHP fluid loss were two major problems. The team worked out the operation plan, quickly screened out the appropriate weighting agent and treatment agent, and the person in charge of the site quickly completed the field formula selection experiment. In the evening of June 13, nearly a thousand tons of mud additives were delivered to well # 1. Field , the field worker prepared and replaced 2.65 g / cm3 ultra-high density drilling fluid. At 1 a.m of 23 June, well # Le Tan 1 continued to drill down in good conditions.

Related information:

The southern margin of Junggar Basin is vast, the oil and gas resources are buried deep, the geological structure is complex, and the oil and gas exploration is regarded as a world-class problem. In the process of drilling in well No .1, domestic technology has been used with oil-resistant screw, ultra high density oil-based drilling fluid plugging technology were used, large borehole gravel drilling technology, and domestic drilling equipment were used to undertake drilling construction tasks .