Search

CN-121991668-A - Neutral blocking remover for oil and gas well and preparation method thereof

CN121991668ACN 121991668 ACN121991668 ACN 121991668ACN-121991668-A

Abstract

The invention discloses a neutral blocking remover for an oil and gas well and a preparation method thereof, and belongs to the technical field of blocking removers. The neutral plugging remover for the oil and gas well is prepared by dissolving a nonionic surfactant in water, adding a biological enzymolysis plugging agent and a metal chelating agent, uniformly mixing, heating, adding a dispersing agent, an emulsifying agent and a water wetting agent, and uniformly mixing. The biological enzymolysis plugging agent in the formula can efficiently decompose stubborn plugs such as greasy dirt, organic scale and the like, so that the plugs are loose in structure, and the metal chelating agent is further combined with metal scale ions in the plugs, so that the neutral plugging agent has a good cleaning effect on multi-component complex scale. The invention is suitable for removing multi-component complex dirt in oil and gas wells.

Inventors

  • LIU YIN
  • HUA LIANG
  • LUO YIHENG
  • GAO YAN
  • TENG JUNNAN
  • CHEN HUILEI
  • YANG BOBO
  • HUANG DEHUI
  • ZHAO QINGJIE

Assignees

  • 中国石油集团渤海钻探工程有限公司
  • 中国石油天然气集团有限公司

Dates

Publication Date
20260508
Application Date
20241107

Claims (9)

  1. 1. The neutral blocking remover for oil and gas well is characterized by comprising the following raw materials of nonionic surfactant, biological enzymolysis blocking remover, metal chelating agent, dispersing agent, emulsifying agent, water wetting agent and water.
  2. 2. The neutral plugging remover for oil and gas wells according to claim 1, wherein the nonionic surfactant is 0.3-1 wt%, the biological enzymolysis plugging remover is 0.03-0.1 wt%, the metal chelating agent is 4-6.5 wt%, the dispersing agent is 1-1.7 wt%, the emulsifying agent is 0.2-0.8 wt%, the water wetting agent is 1.5-2.5 wt%, and the balance is water.
  3. 3. The neutral plugging remover for oil and gas wells according to claim 2, wherein the nonionic surfactant comprises laurylamine polyoxyethylene ether, octylphenol polyoxyethylene ether, nonylphenol polyoxyethylene ether, fatty alcohol polyoxyethylene ether, glyceride or sorbitol ester; the biological enzymolysis plugging agent comprises SJY-03 or SJY-04.
  4. 4. A neutral plug removal agent for oil and gas wells according to any one of claims 1 to 3, wherein the metal chelating agent comprises tetrasodium ethylenediamine tetraacetate, amine citrate, pentasodium diethylenetriamine pentaacetate or sodium ethylenediamine tetraacetate.
  5. 5. A neutral plugging breaker for oil and gas wells according to any one of claims 1-3, wherein the dispersant comprises sodium phosphate, sodium pyrophosphate, sodium tripolyphosphate, citrate or gluconate.
  6. 6. A neutral plugging-removing agent for oil and gas wells according to any one of claims 1 to 3, wherein said emulsifier comprises an anionic surfactant or an alcohol ether carboxylate free of chloride ions; the anionic surfactant comprises sodium oleate, sodium dodecyl sulfate, alkyl sulfonate or alkyl polyoxyethylene ether sulfate acetate.
  7. 7. A neutral plugging breaker for oil and gas wells according to any one of claims 1-3, wherein said water wetting agent comprises polyacrylate or methacrylate.
  8. 8. The method for preparing the neutral plugging remover for oil and gas wells according to any one of claims 1 to 7, wherein the neutral plugging remover for oil and gas wells is prepared by dissolving a nonionic surfactant in water, adding a biological enzymolysis plugging remover and a metal chelating agent, uniformly mixing, heating, adding a dispersing agent, an emulsifying agent and a water wetting agent, and uniformly mixing.
  9. 9. The method for preparing a neutral plugging remover for oil and gas wells according to claim 8, wherein the temperature is 45-52 ℃.

Description

Neutral blocking remover for oil and gas well and preparation method thereof Technical Field The invention belongs to the technical field of blocking remover, relates to a blocking remover for an oil and gas well, and in particular relates to a neutral blocking remover for an oil and gas well and a preparation method thereof. Background In the context of increasing energy demands, the importance of the yield and efficiency of oilfield development is increasingly prominent. However, with the continuous advancement of oilfield exploitation, the problem of plugging an oil well gradually becomes one of the main factors restricting the efficient production of an oilfield. The oil well blockage not only reduces the oil gas yield, but also increases the production cost, and the potential hazard and serious influence on the stable and safe production of the oil field are possible. For example, in carbonate oil fields, because the concentration of calcium, barium and magnesium ions is high and the solubility product is small, water lock, shaft scaling, pipe column corrosion and other conditions are often caused, and as production advances, irreversible inorganic scale products mainly containing calcium, barium and magnesium ions are slowly generated, so that the problems of reservoir blockage, reservoir damage, capacity reduction and the like are caused. For a long time, no matter whether water, organic matters or other chemical reagents are injected, the injection quantity is gradually reduced, the injection pressure is continuously increased, the crude oil yield is gradually reduced, and irreversible damage is brought to an oilfield reservoir. The existing blocking removal technology mainly comprises a blocking removal technology and a chemical blocking removal technology. The chemical blocking removing technology is more commonly used, and the components such as greasy dirt, polymers, inorganic matters and the like in the blocking material are degraded and dissolved by utilizing the chemical characteristics of the medicament, so that the purpose of blocking removing is achieved. The key of the chemical blocking remover is that the chemical blocking remover has higher pertinence, the composition of scale, the scale formation position, the scale degree and the like must be defined, and then the type and the dosage of the blocking remover are selected. The neutral blocking remover utilizes the reactive groups in the neutral blocking remover to react with asphalt scale and polymer scale in the oil field stratum, has low-concentration scale dissolving capacity and mild reaction, and has no pipe blocking phenomenon caused by scale flaking and falling in the traditional pickling process and no corrosion damage of pickling on equipment materials. However, the conventional neutral blocking remover has poor effect, and particularly cannot effectively remove dirt containing oil stains, polymers, inorganic matters and other complex components. Disclosure of Invention The invention aims to provide a neutral plugging remover for an oil and gas well and a preparation method thereof, so as to solve the problem that the conventional neutral plugging remover is poor in complex multicomponent dirt removal effect. In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: The neutral blocking remover for oil and gas well is prepared with non-ionic surfactant, biological enzymolysis blocking remover, metal chelating agent, dispersant, emulsifier, water wetting agent and water. As a limitation, the nonionic surfactant is 0.3-1 wt%, the biological enzymolysis plugging agent is 0.03-0.1 wt%, the metal chelating agent is 4-6.5 wt%, the dispersant is 1-1.7 wt%, the emulsifier is 0.2-0.8 wt%, the water wetting agent is 1.5-2.5 wt%, and the balance is water. As a further limitation, the nonionic surfactant includes laurylamine polyoxyethylene ether, octylphenol polyoxyethylene ether, nonylphenol polyoxyethylene ether, fatty alcohol polyoxyethylene ether, glyceride or sorbitol ester; the biological enzymolysis plugging agent comprises SJY-03 or SJY-04. Wherein the biological enzymolysis plugging agents SJY-03 and SJY-04 are purchased from Tianjin Sanjunyu biotechnology group Co., ltd, and the commodity numbers are SJY-03 and SJY-04. The biological enzymolysis plugging agent can dissolve and disperse inorganic matters and organic matters in the plugging material, including calcium carbonate, calcium sulfate, wax, asphaltene and the like, especially greasy dirt and organic dirt, so as to restore the permeability of an oil well. The nonionic surfactant can play a role in emulsification, dispersion and wetting, so that the overall fluidity of the neutral blocking remover is improved, and the biological enzymolysis blocking remover with high biological activity, the metal chelating agent and the like enter into the rock and the deep part of the blocked pore throat, so that the blocking removing effect of t