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Ren X.,Drilling and Production Research Center
Drilling Fluid and Completion Fluid | Year: 2010

Well Ha3-H3 is a horizontal well with four laterals connected to one main well bore, the so-called "fish bone-like" multilateral well. The main well bore, completed at 2, 994 m, has a maximum well angle of 95.72, a horizontal displacement of 1, 016.73 m, and a horizontal section length of 650 m. The maximum length of the four lateral sections is 180 m, while the minimum is 100 m. Polymer drilling fluid and oil-in-water drilling fluids were used in this well. Field application shows that the fluids used is inhibitive enough in preventing downhole troubles related to water sensitive rocks, such as mud-making and bit balling. Electric logging and cementing job were conducted successfully. Using a 8 mm oil bean, the well has production rate of 44 t/d oil and 15, 000 m3/d natural gas, 15 times that of offset wells.


Kuang S.,Drilling and Production Research Center | Pu X.,Drilling and Production Research Center | Liu Y.,Drilling and Production Research Center
Drilling Fluid and Completion Fluid | Year: 2010

Weighting agent is the important factor affecting the wall building property of ultra-high density water based drilling fluid. The sedimentation and hydration of weighting agents are the important factors affecting the wall building property of ultra-high density water-base drilling fluid. A technical method, involving the use of a special treating-agent which can absorb on the surface of weighting agents and increase the zeta potential and hydratability, is proposed. A wetting and dispersing agent GR is developed, which can increase the zeta potential of weighting agents, and improving the sedimentation stability and wall building property of ultra-high density water based drilling fluid.


Kuang S.,Drilling and Production Research Center | Pu X.,Drilling and Production Research Center | Liu Y.,Drilling and Production Research Center
Drilling Fluid and Completion Fluid | Year: 2011

Based on colloid chemistry and microscopic fluid mechanics, the mechanisms of dispersion stability and rheology of water base solid suspension emulsion are analyzed in this paper. A technical idea is developed that increasing the surface repulsion of weighting materials by some special absorption agents to improve stability and rheology of high-density drilling fluid. The experimental results show that GR, a lubricating and dispersing agent, can increase the Zeta surface potential and improve stability and rtheology of high-density drilling fluid. By using the critical agent GR, a water-base drilling fluid system with a density of 2.80 g/cm 3 is developed which verifies the feasibility of the technology.

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