Search

CN-122012058-A - Composite blocking remover for removing oilfield microsphere blocking, and preparation method and application thereof

CN122012058ACN 122012058 ACN122012058 ACN 122012058ACN-122012058-A

Abstract

The invention provides a composite blocking remover for removing oilfield microsphere blocking, and a preparation method and application thereof, and belongs to the technical field of chemical blocking removal in petroleum exploitation. The composite blocking remover comprises a pretreatment liquid, a main treatment liquid and a post-treatment liquid, wherein the pretreatment liquid and the post-treatment liquid are composite ionic liquids, and the composite ionic liquids are formed by compounding an alkyl pyridine aluminate ionic liquid and a dialkyl pyrrole aluminate ionic liquid. The invention realizes accurate blocking removal through molecular design, has high efficiency and environmental protection, and has wide application prospect in multiple fields.

Inventors

  • PENG JIANWEN
  • GUO JUNSEN
  • ZHOU YAO

Assignees

  • 陕西毅德能源科技有限公司

Dates

Publication Date
20260512
Application Date
20260205

Claims (8)

  1. 1. The composite blocking remover for removing the blocking of the oilfield microspheres is characterized by comprising a pretreatment liquid, a main treatment liquid and a post-treatment liquid, wherein the pretreatment liquid and the post-treatment liquid are composite ionic liquids, and the composite ionic liquids are formed by compounding alkyl pyridine aluminate ionic liquids and dialkyl pyrrole aluminate ionic liquids.
  2. 2. The composite blocking remover for removing oilfield microsphere blocking according to claim 1, wherein the pretreatment liquid and the main treatment liquid respectively comprise 8-12% of HCL, 1-3% of emulsifying agent, 1-2% of clay stabilizer, 1-3% of corrosion inhibitor and the balance of water.
  3. 3. The composite plugging remover for removing oilfield microsphere plugging according to claim 2, wherein the emulsifier is at least one selected from OP-10, ABS, AEO-9.
  4. 4. The composite blocking remover for removing oilfield microsphere blocking according to claim 2, wherein the clay stabilizer is at least one selected from quaternary ammonium salt clay stabilizers and ammonium chloride cationic composite clay stabilizers.
  5. 5. The composite plugging remover for removing oilfield microsphere plugging according to claim 2, wherein the corrosion inhibitor is at least one selected from the group consisting of inorganic corrosion inhibitors, organic corrosion inhibitors, and polymeric corrosion inhibitors.
  6. 6. The composite blocking remover for removing the blocking of oil field microspheres according to claim 1, wherein the preparation method of the composite ionic liquid comprises the steps of mixing alkylpyridine aluminate ionic liquid and dialkylpyrrole aluminate ionic liquid according to a mass ratio of 1.5-2:2-3, and preserving heat for 2-3 hours at a temperature of 85-95 ℃.
  7. 7. The method for removing the composite plugging agent for removing the plugging of the microspheres in the oil field according to any one of claims 1 to 6, wherein the method comprises the step of injecting the pretreatment liquid, the main treatment liquid and the post-treatment liquid in a positive extrusion mode.
  8. 8. The method for unblocking a composite unblocking agent for unblocking an oilfield microsphere according to claim 7, wherein the injection displacement of the pretreatment liquid is 0.3-0.6m 3 /min and the injection displacement of the pretreatment liquid is 0.2-0.4m 3 /min.

Description

Composite blocking remover for removing oilfield microsphere blocking, and preparation method and application thereof Technical Field The invention relates to the technical field of chemical blocking removal in petroleum exploitation, in particular to a composite blocking remover for removing oilfield microsphere blocking, and a preparation method and application thereof. Background The microsphere is a deep profile control technology of a water injection well, which is researched and applied more in oil fields in recent years, and belongs to a nano polymer. The nano polymer microspheres can generate physical blocking to the water phase in the microcrack in the form of blocking, bridging, superposition blocking and the like in the reservoir, so that the pressure of the water injection well is increased, the water flooding wave and volume are enlarged, the water flooding development effect is improved, and finally the aim of improving the oil and gas recovery ratio is achieved. However, with the long-term injection of polymer nano-microspheres in oil fields in recent years, the problems of (1) partial well and layer injection pressure approaching the system injection pressure and under-injection or stop-injection due to high injection pressure occur in partial water injection wells. (2) Partial well, layer polymer underinjection is severe and even no injection occurs. (3) After partial wells and subsequent water flooding in the layer transition, the adaptability is poor, the underfilling is serious, and even the underfilling is not carried out. Seriously affecting the normal production of the oil field. Aiming at the blockage caused by the polymer nano microsphere, an acid blocking remover is generally adopted for blocking removal in the prior art, but the conventional acid blocking remover has poor blocking removal effect and shorter effective period for an underinjected well caused by the profile control of aldehyde crosslinked polymer gel, and cannot achieve the expected effect. Therefore, a method for removing microsphere blockage with good blockage removal effect and stable effect is needed. Disclosure of Invention The composite blocking remover comprises a pretreatment liquid, a main treatment liquid and a post-treatment liquid, wherein the pretreatment liquid and the post-treatment liquid are composite ionic liquids, and the composite ionic liquids are formed by compounding alkyl pyridine aluminate ionic liquids and dialkyl pyrrole aluminate ionic liquids. Preferably, the pretreatment liquid and the main treatment liquid respectively comprise 8-12% of HCL, 1-3% of emulsifying agent, 1-2% of clay stabilizer, 1-3% of corrosion inhibitor and the balance of water in percentage by mass. Preferably, the emulsifier is at least one selected from OP-10 (octylphenol polyoxyethylene ether-10), ABS (sodium dodecyl benzene sulfonate) and AEO-9 (fatty alcohol polyoxyethylene ether-9). Preferably, the clay stabilizer is at least one selected from potassium chloride, ammonium chloride, potassium sulfate and 2-chloroethyl trimethyl ammonium chloride. Preferably, the corrosion inhibitor is at least one selected from silicate, benzotriazole and polyaspartic acid. Preferably, the preparation method of the composite ionic liquid comprises the steps of mixing the alkyl pyridine aluminate ionic liquid and the dialkyl pyrrole aluminate ionic liquid according to the mass ratio of 1.5-2:2-3, and preserving the temperature for 2-3 hours at the temperature of 85-95 ℃. The invention also provides a blocking removing method of the composite blocking remover for removing the blocking of the oilfield microspheres, which comprises the following steps of injecting pretreatment liquid, main treatment liquid and post-treatment liquid in a positive extrusion mode, wherein the injection displacement of the pretreatment liquid is 0.3-0.6m 3/min, the injection displacement of the pretreatment liquid is 0.2-0.4m 3/min, the injection displacement of the main treatment liquid is 0.3-0.6m 3/min, and the injection displacement of the post-treatment liquid is 0.2-0.4m 3/min. Preferably, the well is cleaned in a positive circulation mode, then the pretreatment liquid is extruded in the positive direction, the active water is extruded in the positive direction, the pretreatment liquid is extruded in the positive direction, the main treatment liquid is extruded in the positive direction, the active water is extruded in the positive direction, the well is closed for 3 hours, and the blocking removal is completed. The invention has the beneficial effects that: According to the invention, the composite blocking remover is injected into the stratum, the composite blocking remover decomposes microsphere blocking matters into granular groups, the granular groups are decomposed into molecular mixed liquid through long-time soaking reaction, the viscosity of the liquid is greatly reduced, and the microsphere decomposing liquid is brought out of the stratum