Mud cake dispersing agent for oil-gas well yield increase

Abstract

The invention discloses a mud cake dispersing agent for oil-gas well yield increase. The mud cake dispersing agent is prepared by compounding, by mass, 10 to 20 parts of protease, 10 to 20 parts of amylase, 10 to 20 parts of cellulase, 5 to 10 parts of lignin peroxidase, 5 to 10 parts of glutathione, 5 to 10 parts of trisodium hydroxyethyl ethylenediamine triacetate and 5 to 10 parts of a lipopeptide active agent. Through mutual superposition of three effects of catalyzing chain scission macromolecules, chelating and dispersing inorganic matters and stripping and dispersing crude oil, the adhesive force of a mud cake is reduced, and the mud cake is promoted to be quickly stripped and dispersed; and the factor of leaking the liquid entering the oil reservoir is fully considered, and the solution entering the oil reservoir can be chelated, dialyzed, water-locked and oil-dirt-removed to improve the permeability of a near wellbore area for factors such as a tight oil-gas field, a heavy oil-gas field and mudstone expansion.

Description

technical field [0001] The invention relates to a mud cake dispersant, in particular to a mud cake dispersant for increasing production of oil and gas wells. Background technique [0002] Drilling fluid is a key link in well drilling. Its purpose is to protect the well wall, drill quickly, form a good well structure, and improve production efficiency. Drilling fluids include: solid phase (such as containing bentonite, calcium carbonate, barium sulfate) mud, solid-free mud, oil-based mud, etc. During the drilling process, the drilling fluid will form a good filter cake on the well wall, stabilize and seal the well wall, thus providing a good guarantee for the subsequent implementation of production. [0003] Although the formation of mud cake effectively protects the safety of the oil and gas well structure during drilling, its sealing also restricts the efficiency of well production. The mud cake drilled in conventional vertically inclined wells will restrict the cementing...

AI Technical Summary

Problems solved by technology

[0006] 1. There is a risk of corrosion to the equipment;

[0007] 2. The acid liquid may leak into the surrounding of the casing, which will dissolve the cement sheath of cementing, reduce the strength or even cause the risk of layering;

[0008] 3. There is a danger of acid liquid leaking into the formation, opening up the fault zone, causing water or leakage, and affecting production capacity;

[0009] 4. Acid preparation and reverse discharge operations are dangerous to people and the environment (hydrochloric acid and hydrofluoric acid are both controlled items)

[0010] In view of the problems of low mud cake removal efficiency, poor reservoir protection and equipment protection by conventional methods, a universal application feature, environmental protection, safety, convenience and ease of operation is invented, which can effectively remove mud cake caused by drilling mud. It is very necessary to improve the technology of increasing production and increasing production under the restriction of filter cake

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