Bio-enzyme well completion fluid

Abstract

The invention discloses bio-enzyme well completion fluid. The well completion fluid is prepared from 1-10 parts of bio-enzyme parathion and 90-99 parts of water, or bioacid, acetic acid or metal-chelator are added to prepare the well completion fluid which is injected into an oil-gas well through a pump truck. The well completion fluid is absorbed at the surface layer of the drill core, can help to avoid reservoir pollution and corrosion to the downhole tools during the drilling operation, removes organic scales and inorganic sediment, thoroughly degrades the polymer, disperses the filter cakes, can permeate into the micro pore-throat, improves the water wetting effect, eliminates water lock damage, reduces the oil-water surface interface tension, improves the oil-gas permeability, and enables the oil-gas well to have the optimal production state and to achieve good economic benefit.

Description

technical field [0001] The invention relates to a well completion fluid in oilfield development, in particular to a biological enzyme completion fluid. Background technique [0002] Completion fluid is the liquid used in the whole process from drilling the oil layer to putting the oil well into production. The working fluid used in the oil and gas field completion operation is collectively called the completion fluid. The function of the completion fluid is mainly to protect the reservoir and ensure construction safety. Therefore, The following requirements must be met: (1) protect the oil and gas layers to the greatest extent and prevent damage to the reservoir; (2) reduce the flow resistance when the oil and gas flow enters the wellbore; (3) effectively seal off the oil, gas and water layers and prevent the (4) Overcome well collapse or sand production in production layers, ensure long-term stable production of oil and gas wells, and prolong well life; (5) Simple process a...

AI Technical Summary

Problems solved by technology

Although these completion fluid systems can achieve low damage to the reservoir through a lot of work, and the technical parameters meet the requirements of reservoir protection, but it cannot relieve and overcome the original damage of the reservoir: such as various macromolecular treatment agents in the Adsorption, retention and accumulation in the reservoir; incompatibility between various operating fluids and formation water; incompatibility between various operating fluids and reservoir minerals: perforation is difficult to remove deep damage caused by liquid phase and treatment agents; Perforation is difficult to remove the solid plugging in the vertical direction between pores; after open hole completion or workover operations, it is difficult to remove deep damage by oil flow itself; It can damage the permeability of the reservoir core to 30% to 50%, and cannot further improve the reservoir to achieve the purpose of increasing production of oil wells