High-cov kua drilling ceev (feem ntau yog xa mus rau cov uas muaj qhov ntom ntom ntau dua 1.80 g / cm³, lossis txog li 2.50-2.80 g / cm³) yog qhov tseem ceeb rau kev drilling qhov tob, ultra- qhov tob tob, thiab siab - cov roj thiab roj tsim. Txawm li cas los xij, vim muaj cov ntsiab lus siab heev (piv txwv li, barite) thiab cov kua theem qis (dej dawb), kev sib cuam tshuam ntawm cov kab mob tshwm sim, ua rau cov khoom rheological (viscosity thiab shear stress) ua rau tsis ruaj khov lossis txawm tias muaj cov tsos mob hnyav los yog ua kom muaj zog.
How can flow characteristics be effectively controlled? There are four ways to go>
1.Particle loj faib optimization:
Qhov no yog txoj hauv kev zoo tshaj plaws los txo qhov kev sib txhuam ntawm cov viscosity ntawm cov khoom -theem particles.
Siv barite ntawm qhov sib txawv ntawm qhov ntau thiab tsawg los yog sib xyaw ntawm cov hlau ore hmoov los sau qhov khoob ntawm cov khoom loj, "qhov zoo tshaj qhov ntim" tuaj yeem ua tiav.
Tight packing txo kev sib tsoo ncaj qha thiab kev sib txhuam ntawm cov khoom thaum lub sij hawm ntws thaum txo qis interparticle void ntim, yog li tso tawm ntau ntau ntawm "dawb dej" yav dhau los daig hauv cov voids no thiab ua kom cov dej ntws zoo heev ntawm cov dej drilling txawm tias cov ntsiab lus siab heev.
2.Ntxiv cov diluents/dispersants (xws li Lignosulfonates, Tannic acid derivatives, Acrylic polymer viscosity reducers, thiab lwm yam).
These agents adsorb onto particle surfaces, increasing the negative charge density on the surface and enhancing the electrostatic repulsion of the double electric layer, which effectively disintegrates the clay's "cardboard house" structure and flocculation network, releasing trapped water into "free water" and significantly reducing both the dynamic and static shear forces of the drilling fluid.
3. Siv cov polymers siab molecular (piv txwv li, Polyanionic cellulose PAC, PHPA):
Txhawm rau tsim cov txheej txheem polymer adsorption ntawm cov tuab tuab ntawm cov khoom-theem particle nto; overlapping txheej tsim steric repulsion rog uas tiv thaiv barite agglomeration thiab sedimentation.
Nyob rau hauv siab - dej ntom ntom - raws li cov dej drilling, tsim kev txiav (xws li cov av nkos) ua rau dej thiab tawg, ua kom muaj ntau cov submicron colloidal particles uas ua rau kom cov cheeb tsam tshwj xeeb, haus dej dawb ntau, thiab ua rau cov viscosity nce exponentially.
4.Ntxiv cov poov tshuaj ions (K⁺), calcium ions (Ca²⁺), los yog organic amine inhibitors:
Lub hydration expansion thiab dispersion ntawm av nplaum thiab pob zeb cuttings yog muaj zog suppressed, yog li tswj qhov kev xav ntawm colloidal particle concentration nyob rau hauv lub system yog qhov tseem ceeb txoj kev.
