63results about How to "Stabilize the wellbore" patented technology

The invention provides a water-soluble organic salt weighting agent for drilling fluid for oilfields as well as a preparation method and application thereof. The method comprises the steps of preparing an organic acid mixture containing bromine atoms, wherein the organic acid mixture comprises C1-C6 organic acids; adding composite alkali containing NaOH, KOH, ammonia water, N(CH3)3 and epoxy chloropropane to the organic acid mixture, stirring the materials to react, and evaporating water until the product is pasty or half-dry, wherein the mass ratio of composite alkali to organic acids is (0.15-1.5):1; drying the product at 80-120 DEG C for 6-24 hours, and grinding the dried product, thus obtaining the granular product. The weighting agent can not only improve the density of solid-free water-based drilling fluid base fluid but also improve the inhibitive capacity of the drilling fluid.

The invention provides a water-soluble organic salt weighting agent for drilling fluid for oilfields as well as a preparation method and application thereof. The method comprises the steps of preparing an organic acid mixture containing chlorine atoms, wherein the organic acid mixture comprises C1-C6 organic acids; adding composite alkali containing NaOH, KOH, ammonia water, N(CH3)3 and epoxy chloropropane to the organic acid mixture, stirring the materials to react, and evaporating water until the product is pasty or half-dry, wherein the mass ratio of composite alkali to organic acids is (0.2-2):1; drying the product at 80-120 DEG C for 6-24 hours, and grinding the dried product, thus obtaining the granular product. The weighting agent Weigh2 can not only improve the density of solid-free water-based drilling fluid base fluid but also improve the inhibitive capacity of the drilling fluid.

The invention discloses an uninterrupted circulating pup joint for petroleum well drilling and a continuous slurry circulation method, and the uninterrupted circulating pup joint comprises a pup joint body, an automatic central gate valve and a lateral normally-closed check valve, wherein the automatic central gate valve and the pup joint body are coaxially arranged; and the lateral normally-closed check valve is arranged on the side wall of the pup joint body below the automatic central gate valve. As the pup joint body structure with the combination of the large-drift diameter unobstructed automatic central gate valve and the triple lateral normally-closed single-flow valve is adopted, when a drill rod needs to be disassembled and assembled for making up, breaking out and pipe tripping,uninterrupted circulation of slurry is changed to be performed by the lateral normally-closed check valve, and pressure of the circulating slurry is utilized for automatically closing the automatic central gate valve above the lateral normally-closed check valve, thereby continuously maintaining the stability of the pressure of a borehole, effectively controlling the ECD (equivalent circulating density) value of annular space of the borehole, maintaining the stability of a well wall and the good effect of cleaning the borehole, preventing collapse and formation of a cuttings bed in the oblique well section and avoiding the collapse, clamping, leakage, blowout and other various complex situations.

The invention discloses a multifunctional drilling fluid additive. By 100 weight percentages, the components are: 10~30 wt. paraffin, 10~30 wt. white oil, 5~15 wt. non-ionic surface active agent, 0.02~5 wt. cationic surface active agent and water. The invention also discloses the method for preparation of the drilling fluid additive: mixing the paraffin and white oil into oil phase; mixing the non-ionic surface active agent and cationic surface active agent into mixed surface active agent; adding the oil phase and mixed surface active agent into the reactor, heating; then adding proper volume preheating water into the reactor till opaque viscous gel phase occurring in the architecture; agitating with rotary speed of 2000~3000rpm and keep the emulsifying temperature during reaction; adding the rest of water into the reactor and stop heating, agitating with 1000rpm, make the emulsion cool down to ambient temperature and get the paraffin pinpoint emulsion.