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CN-122012054-A - Oil-water well Gao Xiaojie plugging agent and preparation method and application thereof

CN122012054ACN 122012054 ACN122012054 ACN 122012054ACN-122012054-A

Abstract

The invention belongs to the technical field of petroleum exploitation, and particularly relates to an oil-water well Gao Xiaojie plugging agent, a preparation method and application thereof. The blocking remover comprises, by weight, 2-4% of a blocking remover, 0.1-0.2% of a multifunctional blocking remover, 0.2-0.5% of a reinforcing blocking remover, and the balance of water. Wherein the acid blocking remover is one or two of hydrochloric acid, hydrofluoric acid and citric acid. The structural formula of the multifunctional blocking remover is as follows: . The reinforced blocking remover is one or more of 3- (N, N-dimethyl dodecyl ammonium) propane sulfonate, 3- (N, N-dimethyl tetradecyl ammonium) propane sulfonate, 3- (N, N-dimethyl hexadecyl ammonium) propane sulfonate and 3- (N, N-dimethyl octadecyl ammonium) propane sulfonate. The blocking remover has the advantages of good blocking removing effect, low corrosion rate and no secondary pollution.

Inventors

  • YANG JIANFENG
  • SONG YUEQING
  • WANG DONG
  • LI QI

Assignees

  • 山东滨州昱诚化工科技有限公司

Dates

Publication Date
20260512
Application Date
20260324

Claims (10)

  1. 1. The plugging agent for the oil-water well Gao Xiaojie is characterized by comprising the following raw materials in percentage by weight: 2-4% of an acidolysis plugging agent; 0.1 to 0.2 percent of multifunctional blocking remover; 0.2 to 0.5 percent of reinforcing blocking remover; The balance of water; the acidolysis blocking agent is one or two of hydrochloric acid, hydrofluoric acid and citric acid, and the concentrations of the hydrochloric acid, the hydrofluoric acid and the citric acid are converted into 100%; The structural formula of the multifunctional blocking remover is as follows: ; the reinforced blocking remover is sulfobetaine.
  2. 2. An oil and water well Gao Xiaojie plugging agent as defined in claim 1, wherein said sulfobetaine comprises one or more of 3- (N, N-dimethyldodecylammonium) propane sulfonate, 3- (N, N-dimethyltetradecylammonium) propane sulfonate, 3- (N, N-dimethylhexadecylammonium) propane sulfonate, and 3- (N, N-dimethyloctadecylammonium) propane sulfonate.
  3. 3. The method for preparing the plugging agent for the oil-water well Gao Xiaojie as claimed in claim 1 or 2, which is characterized by comprising the following steps: S1, adding oleic acid, diethylenetriamine and dimethylbenzene into a first reactor, and heating and preserving heat to perform amidation reaction; S2, continuing heating to perform cyclization reaction; S3, distilling under reduced pressure, cooling, adding distilled water, regulating the pH to 7-8 by using sodium hydroxide, simultaneously dropwise adding carbon disulfide and sodium hydroxide aqueous solution, maintaining the pH to 7-8 in the reaction process, and heating and refluxing for reaction after the dropwise adding is finished; s4, cooling the mixture to below 10 ℃, precipitating crystals, and centrifuging to obtain the multifunctional blocking remover; and S5, sequentially adding water, a multifunctional blocking remover and a reinforced blocking remover into the second reactor, uniformly stirring, continuously adding the blocking remover, and uniformly stirring to obtain the efficient blocking remover for the oil-water well.
  4. 4. The process of claim 3 wherein the molar ratio of diethylenetriamine, carbon disulfide to oleic acid is from 1 to 1.5:0.4 to 0.6:1.
  5. 5. The process of claim 4 wherein the molar ratio of diethylenetriamine, carbon disulfide to oleic acid is from 1.2 to 1.4:0.45 to 0.55:1.
  6. 6. The process according to claim 3, wherein the mass ratio of the xylenes to oleic acid in step S1 is 0.3 to 0.5:1.
  7. 7. The process according to claim 3, wherein the amidation reaction temperature in step S1 is 120 to 140℃for 2 to 4 hours.
  8. 8. The process according to claim 3, wherein the cyclization reaction in step S2 is carried out at a temperature of 170 to 190℃for a period of 6 to 12 hours.
  9. 9. The method of claim 3, wherein the mass ratio of distilled water to oleic acid in step S3 is 4-6:1, and the reflux reaction time in step S3 is 1-2h.
  10. 10. Use of a blocking remover according to claim 1 or 2 in the unblocking of oil and water wells.

Description

Oil-water well Gao Xiaojie plugging agent and preparation method and application thereof Technical Field The invention belongs to the technical field of petroleum exploitation, and particularly relates to an oil-water well Gao Xiaojie plugging agent, a preparation method and application thereof. Background In the petroleum and natural gas exploitation process, the blockage of the near wellbore zone of an oil-water well is a core difficult problem which restricts the efficient development and stable yield and efficiency of an oil field, and the problem is more remarkable when the whole process of well drilling, well completion, water injection and oil extraction is performed, especially in the middle and later stages of the oil field development. The types of the plugs are complex and various, and mainly comprise inorganic scales, organic scales, particulate migration, water lock emulsification and other composite plugs, wherein the inorganic scales are mainly calcium carbonate, the organic scales are mainly waxy and asphaltene deposition, the particulate migration is mainly formed by migration and aggregation of clay particles and silt, the plugs can obviously reduce the stratum permeability, the oil well yield is greatly reduced, the water injection pressure of a water injection well is increased, even liquid stopping and production stopping are caused, and huge economic loss is brought to the production of an oil field. At present, aiming at the problem of blockage of an oil-water well at home and abroad, the technical means of acidification blockage removal, pressure blockage removal, object understanding blockage, biological enzymolysis blockage and the like are mainly adopted. The acid-based blocking removal has the advantages of strong corrosiveness to stratum rock and a shaft pipe column, easy secondary injury, high reaction speed, short effective acting distance, difficult realization of deep blocking removal, easy generation of secondary precipitation of fluorosilicate and the like after acidification, causing the secondary blocking of stratum, short blocking removal effective period and difficult meeting of long-term stable production requirements of oil fields. Although the pressure cracking plug can improve permeability by forming artificial cracks, the construction process is complex and high in cost, and risks such as crack closure and sand blocking exist. Physical blocking removal methods such as hydraulic oscillation and ultrasonic wave have small damage to stratum, but have the advantages of fast energy attenuation, small action radius, short blocking removal effective period and incapability of realizing long-acting blocking removal, and biological enzymolysis blocking has the advantages of environmental protection and no corrosion, but has the advantages of long action time, limited blocking removal effect on composite blocking objects, high cost and difficulty in large-scale popularization and application. The research and development of the oil-water well blocking remover capable of effectively removing composite blocking, low injury and environmental protection becomes a technical problem to be solved urgently in the field of current oilfield development. Disclosure of Invention The invention provides an oil-water well Gao Xiaojie plugging agent and a preparation method thereof, aiming at the defects of the prior art. The blocking remover has the advantages of good blocking removing effect, low corrosion rate and no secondary pollution. The first purpose of the invention discloses an oil-water well Gao Xiaojie plugging agent, which comprises the following raw materials in percentage by weight: 2-4% of an acidolysis plugging agent; 0.1 to 0.2 percent of multifunctional blocking remover; 0.2 to 0.5 percent of reinforcing blocking remover; the balance of water. The acidolysis blocking agent is one or two of hydrochloric acid, hydrofluoric acid and citric acid. It should be noted that the concentrations of hydrochloric acid, hydrofluoric acid and citric acid are converted to 100%, and the concentrations are calculated as follows unless otherwise specified. The structural formula of the multifunctional blocking remover is as follows: 。 the reinforcing blocking remover is sulfobetaine, and comprises one or more of 3- (N, N-dimethyl dodecyl ammonium) propane sulfonate, 3- (N, N-dimethyl tetradecyl ammonium) propane sulfonate, 3- (N, N-dimethyl hexadecyl ammonium) propane sulfonate and 3- (N, N-dimethyl octadecyl ammonium) propane sulfonate, and the structural formula is as follows: Wherein R is one or more of C 12H25、C14H29、C16H33、C18H37. The second object of the invention discloses a preparation method of the blocking remover, which specifically comprises the following steps: S1, adding oleic acid, diethylenetriamine and dimethylbenzene into a first reactor, and heating and preserving heat to perform amidation reaction; S2, continuing heating to perform cyclization reaction; S3, distilling u