Oil wells in production technology introduction

Stimulation of oil wells basic goal is to eliminate the damage near the wellbore or in the formation of high conductivity structure established to improve the productive capacity of the well. In other countries, often used to water, oil-fracturing techniques, but because oil-fracturing technology is too costly, domestic or dominated by  Hydraulic fracturing   Common fracturing methods are: hydraulic fracturing (hydro fracturing method, known as hydraulic fracturing), sandstone matrix acidizing, fracturing filling, fracturing and acidizing. Hydraulic fracturing process is usually two hours,  ceramic proppant  process is very short.
A, acid fracturing
1) acid fracturing uses: acid fracturing used in oil field development late, you can extend the life and increase oil well production.
2) acid fracturing principle: liquid pressure to crack rock by fracturing fluid and  Proppant  ceramic filling cracks, etc., so that oil and gas flow. Fracturing fluid is sand (quartz sand or sand generally refers to the  frac sand   or other support materials, high-viscosity liquids.
Second, hydraulic fracturing
A) the use of hydraulic fracturing: Hydraulic fracturing is production of oil and gas wells, wells by injection of important measures.
2) hydraulic fracturing principle: the use of hydraulic fracturing wells in the surrounding ground pressure pump, the high-viscosity liquids (fracturing fluid + Add liquid) to significantly exceed the formation adsorption capacity displacement injection wells, resulting in high pressure near the bottom This pressure forces the formation of cracks formation, the proppant fracturing fluid with injection of cracks and filled with Proppant , stopping the pump, high flow capacity of the formation to form sand filling cracks, play production, increasing the role of injection . Corresponding costs ratio: 46% fluid infusion, 25% proppant fracturing chemicals accounted for 19%, 10% acid.
Third, the hydraulic fracturing procedure
1) well and layer selection: Domestic Xinjiang wells are 5000-6000 meters deep, while the Zhongyuan oil wells generally 2500-4000 m depth. The cost of fracturing a well is generally from 500 thousand to 1 million yuan, an oil reservoir with multi-layered general.
2) fracturing design: a fixed template, you can enter data in the computer calculation. Construction parameters include: stress, displacement, sand ratio, the amount of sand, the amount of fluid.
3) pre-construction preparation: well testing, formation of wellsite, fracturing fluid preparation (factors: the temperature of the well layer, permeability, clay mineral content, the liquid nature), wellhead equipment (wellhead pressure by the case may be) replacement and security.