Alkyl Glycosides Exhibit Good Lubricity

2023-03-03 16:36:50

Alkyl glycoside APG soil-free drilling fluid has less solid content and less submicron solid particles, which greatly relieves the solid phase from invading the formation and blocking the reservoir pore throat during drilling, and reduces the damage of solid to the reservoir. A sufficient amount of APG can effectively inhibit the hydration expansion of water-sensitive minerals in the formation and reduce liquid phase damage. The oil/water interfacial tension of the filtrate is 3.6-4.7mN/m. The recovery value of the permeability of the low-permeability natural core is more than 99%, and the 0.5cm polluted end face is removed, which shows that the drilling fluid has a low pollution depth to the reservoir, causes little damage to the reservoir, and has a good oil and gas layer protection effect.

(1) The strong inhibition of APG can better solve the problem of hydration and dispersion of drilling cuttings and pollute drilling fluid, effectively control the solid phase content, keep the wellbore clean, and reduce the drilling fluid circulation pressure loss in the horizontal section of the slim hole, The drilling speed is increased, and the damage of the solid to the reservoir is reduced; at the same time, the hydration expansion of the water-sensitive minerals in the formation is suppressed, and the damage of the liquid phase is reduced.

(2) APG has good lubricity, except for a certain amount of polyalcohol SYP supplemented in the lower section, no other lubricants are used.

(3) After blockage occurred, correct drilling fluid treatment measures were taken to maintain the stability of the wellbore, meet the needs of drilling engineering, and ensure that the drilling tool was transported in place once, the electric test was successful once, and the staged fracturing string was performed once The download is successful.

(4) APG soil-free drilling fluid is the first combination of APG and soil-free drilling fluid in China. The research and application have been successful, which has improved the research and application level of horizontal well drilling fluid and promoted the development of unconventional oil and gas reservoirs.

(5) The inhibition of the system needs to be further improved to cope with the hydration collapse of large sections of shale formations. The next step is to carry out field tests of strongly inhibited cationic alkyl glycoside CAPG and the optimization of plugging materials to improve the drilling fluid system.