Abstract
8000-meter drilling rig and quadruple joint 9000-meter drilling rig have been developed for ultra-deep and complex wells of the complicated geological structure area in Tarim Basin, China. The key components of the drilling rigs are redesigned and innovated, including optimization of the high bearing capacity derricks and substructures and a completely new design of integrated single shaft drawworks with the compacted strand wire rope. The rotary table and its driving device with larger torque and load capacity, the high-pressure drilling pump with a high power, intelligent top drive system, casing running device with good compatibility, and automated pipe handling system are equipped. Field application shows that 8000 meters drilling rig, compared with the conventional 9000-meter drilling rig, can save equipment procurement costs by about 20%, reduce drilling operational costs 37%. In addition, the quadruple joint 9000-meter drilling rig can reduce the tripping time by more than 20%, and that the pressure is difficult to control in the complicated formation by conventional drilling rigs can be avoided to a certain extent. At the end of this paper, the advantages and the problems to be solved urgently of the ultra-deep well drilling rigs are expounded.
Highlights
The geological conditions in the piedmont area of Tarim oilfield are extremely complex, such as thick conglomerate layer, composite salt-gypsum layer, multi-pressure system, high temperature and high pressure alternately appear
In order to economically exploit the deep reservoirs in the area, Baoji Oilfield Machinery Co. of CNPC developed a 9000m ultra-deep drilling rig in 2006
The key components of 8000-meter drilling rig and the quadruple joint drilling rigs are redesigned in order to further solve the operation problems of ultra-deep well in the piedmont area of Tarim oilfield, which mainly include the high-bearing capacity derrick and substructure with optimized design, the hoisting system with compacted strand wire rope, the integrated single-axle drawworks with larger rope capacity, the rotary table with greater torque and carrying capacity, the high-pressure mud pump with high-power, the high-power electric control system, the intelligent top drive system, the top drive casing running device with good compatibility, and automated pipe handling system, etc
Summary
The geological conditions in the piedmont area of Tarim oilfield are extremely complex, such as thick conglomerate layer, composite salt-gypsum layer, multi-pressure system, high temperature and high pressure alternately appear. The effect is not satisfactory, and it is impossible to achieve the cost cutting and efficiency increasing because of the high daily cost It is an urgent necessary for ultra-deep well drilling rigs with larger carrying capacity, lower drilling cost and higher cost-effectiveness. The redesigned high-power drawworks has effectively solved the problem of mutual restriction between the lifting capacity of the drawworks and the speed of the hook, which can meet the need of running large tonnage casing in piedmont area of Tarim. The size of the tail pipe can increase from 127 mm of 7000-meter drilling rig to 139.7 mm, and the large size casings above 10 inches can be run to more than 6000 meters, which meets the requirement of the depth for running the large diameter, large tonnage casings and the high-pressure drilling operation in the ultra-deep wells. The domestic drilling rig series is enriched [1]
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