Balanced Pressure Drilling: A drilling method that maintains the wellbore pressure equal to the formation pressure throughout the drilling process is known as balanced pressure drilling.

Jet Drilling: Jet drilling is a drilling method that utilizes the hydraulic effect of high-speed jet streams produced when drilling fluid is ejected through the nozzle of a jet drill bit, to improve the mechanical drilling speed.

Cementing: It involves lowering a string of casing to a specified depth into the wellbore and then injecting cement slurry around it to secure the casing in place on the wellbore wall, preventing wall collapse. The purpose is to isolate loose, unstable, and leak-prone formations; seal off oil, gas, and water layers to prevent cross-leakage; install wellheads to control the flow of oil and gas, facilitating drilling or production.

Drill String Formation Testing

Casing and tubing formation testing is a technique that involves lowering a formation tester equipped with packers into a well via the drill pipe or casing for oil testing. It can be performed in wells with existing casing as well as uncased open-hole wells; it can be conducted after drilling completion or even during the drilling process.

Cable Formation Testing

After oil and gas shows are discovered during drilling, the cable下入 formation tester can obtain fluid samples from the formation and measure formation pressure, known as cable formation testing. This method is relatively simple and can be performed repeatedly and repeatedly.

YouTube Transmission Perforation

The Tube Transmission Perforation involves inserting a perforating gun into the well through the tubing, allowing the formation fluids to flow directly to the surface via the tubing after perforation, without the need to pump in large amounts of kill fluid during the perforation process to prevent wellbore contamination.

Rock porosity

Porosity of rock refers to the ratio of the void volume (Vp) to the total volume (Vb) of rock that is not filled with solid matter. It is denoted by the Greek letter Φ and is expressed as: Φ = VVoid/VRock × 100% = Vp/Vb × 100%.

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The coefficient of soil oil volume, also known as the underground coefficient of oil volume or simply the oil volume coefficient, is the ratio of the volume of oil underground (i.e., the soil oil volume) to its volume after degassing on the surface. The underground volume coefficient of oil, βo, is always greater than 1.

Fluid Saturation

The saturation of a fluid refers to the percentage of the volume of a certain fluid occupying the pores of the reservoir rock. It indicates the extent to which the pore space is filled by the fluid. If several phases of fluids fill the pores of the rock, the sum of their saturations is equal to 1 (100%).