Abstract
Curing research on waste oil-base shale gas drilling mud was performed for optimal additions matching. Destabilizing experiments on waste drilling mud demonstrated that Aluminum potassium sulfate (KAl(SO4)2) played a best role of destabilizing effects when compared with FeCl3 and AlCl3 based on demulsification mechanism about oil-in-water type. Aluminum potassium sulfate emerged an impact influence on curing effects simultaneously when compared to sodium silicate, alumina, lime and complex Portland cement. Orthogonal test on curing waste drilling mud revealed that the optimal operation conditions of handling waste drilling mud was 4% aluminum potassium sulfate, 4% sodium silicate, 4% alumina, 4% lime and 16% complex Portland cement. Under this condition, unconfined compressive strength of the curing product was 1.80MPa, and lead leaching concentration cannot be detected after 7d maintenance. The curing mechanism was mainly the encapsulation of C3S and solid waste contaminated by mineral oil can be efficiency treated after breaking the interface of oil-in-water type.
Highlights
There are 100×1012 m3 shale gas in Central Asia, which is second to North America possessing the biggest shale gas reserves [1]
Orthogonal test on curing waste drilling mud revealed that the optimal operation conditions of handling waste drilling mud was 4% aluminum potassium sulfate, 4% sodium silicate, 4% alumina, 4% lime and 16% complex Portland cement
Analysis for drilling mud reveals that the main contaminant is total petroleum hydrocarbon (TPH) and heavy metals (Pb and Zn)
Summary
There are 100×1012 m3 shale gas in Central Asia, which is second to North America possessing the biggest shale gas reserves [1]. One is the rock cuttings from drilling, and the another is the waste drilling fluid It discharged without control will bring a series of environment problems, such as ecology system crash and soil deterioration [2]. Leonard and Stegemann acted a systematic treatability study to treat waste drilling mud by stabilization with Portland cement (CEM I) and high carbon power plant fly ash (HCFA) [11]. It revealed itself effective on inhibiting contaminants leached out [11]. Waste shale gas oil-base drilling cuttings must be destabilized before curing, different from petroleum drilling muds. This paper uses a destabilizer to disperse mineral oil and drilling cuttings and further stabilize the drilling muds by applying multifold binders, which is an innovative way to treat the waste oil-base shale gas drilling mud
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