Protection liquid injection method and device

• Main Authors: JIA MIN, LIU YAN, LI JUN, LI NAN, CAO GUANGQIANG, WANG YUN
• Format: Patent
• Language: Chinese; English
• Published: 16.03.2018
• Subjects: EARTH DRILLING; EARTH DRILLING, e.g. DEEP DRILLING; FIXED CONSTRUCTIONS; MINING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS

The embodiment of the invention provides a protection liquid injection method and device. The method comprises the steps that the work condition parameters of a target well are obtained; according tothe work condition parameters, the injection volume of water-based protection liquid and the injection volume of oil-based protection liquid are determined; and according to the injection volume of the water-based protection liquid and the injection volume of the oil-based protection liquid, the water-based protection liquid and the oil-based protection liquid are injected into an annulus in the target well, and the oil-based protection liquid is located above the water-based protection liquid in the longitudinal direction. According to the scheme, the protection liquid is injected into the annulus in the target well according to the specific condition of the target well, and the oil-based protection liquid in the protection liquid is located above the water-based protection liquid in thelongitudinal direction, so