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CN-121991460-A - High-strength ultra-low density solid-free foam resin slurry and preparation method thereof

CN121991460ACN 121991460 ACN121991460 ACN 121991460ACN-121991460-A

Abstract

The invention relates to the technical field of foam well cementation of petroleum and natural gas wells, in particular to high-strength ultra-low density solid-free foam resin slurry and a preparation method thereof, wherein a required amount of thermosetting resin is stirred and mixed, and a curing agent is added and then mixed and stirred uniformly to obtain resin-based slurry; adding required amount of coagulant and diluent into resin-based slurry in turn, mixing and stirring to obtain slurry, adding required amount of foaming agent and foam stabilizer into the slurry, mixing and stirring to obtain high-strength ultra-low density solid-free foam resin slurry. The invention can not add any solid phase material, uses thermosetting resin and curing agent as matrix, improves the compressive strength of the cured low-density resin, and adds foaming agent and foam stabilizer into the liquid phase, so that the resin slurry is filled with uniform and dense bubbles, thereby not only reducing the density of the resin slurry, but also having good stability, improving the recovery ratio and oil gas yield, and prolonging the oil gas exploitation life.

Inventors

  • ZHOU YAJUN
  • WANG SUKAI
  • MA JIANG
  • WU YANG
  • SONG HUIGUANG
  • QIN XI
  • PEI XUEFENG
  • ZHU WEILUN
  • LI BOYANG

Assignees

  • 中国石油天然气集团有限公司
  • 中国石油集团西部钻探工程有限公司

Dates

Publication Date
20260508
Application Date
20241101

Claims (10)

  1. 1. The high-strength ultralow-density solid-free foam resin slurry is characterized by comprising, by mass, 100 parts of thermosetting resin, 15 to 25 parts of curing agent, 10 to 20 parts of setting regulator, 5 to 15 parts of diluent, 5 to 10 parts of foaming agent and 1 to 5 parts of foam stabilizer.
  2. 2. The high-strength ultra-low-density solid-free foam resin syrup according to claim 1, wherein the thermosetting resin is one or more of phenolic resin, epoxy resin and unsaturated polyester resin.
  3. 3. The high-strength ultra-low-density solid-free foam resin syrup according to claim 1 or 2, wherein the curing agent is at least one of an acid anhydride curing agent and a resin curing agent.
  4. 4. The high-strength ultra-low density solid-free foam resin slurry according to any one of claims 1 to 3, wherein the coagulant is one or more of inorganic salt coagulant and organic coagulant, wherein the inorganic salt coagulant is one of calcium carbonate and sodium carbonate, and the organic coagulant is one of polyacrylamide and polyethyleneimine.
  5. 5. The high-strength ultra-low-density solid-free foam resin slurry according to any one of claims 1 to 4, wherein the diluent is a glycidyl alkyl ether type substance.
  6. 6. The high-strength ultra-low-density solid-free foam resin slurry according to any one of claims 1 to 5, wherein the foaming agent is one of a chemical foaming agent, a physical foaming agent and a surfactant, wherein the chemical foaming agent is one of an organosilicon foaming agent, an azo foaming agent, a nitroso foaming agent and a foaming agent containing sulfonyl hydrazine groups, and the foam stabilizer is one or more of cocamidopropyl hydroxysulfobetaine and sodium dodecyl sulfate.
  7. 7. The high-strength ultra-low-density solid-free foam resin slurry according to any one of claims 1 to 6, which is prepared by the following method: Firstly, stirring and mixing a required amount of thermosetting resin, adding a curing agent, and uniformly mixing and stirring to obtain resin matrix slurry; Secondly, adding the required amount of coagulant and diluent into the resin matrix slurry in sequence, and mixing and stirring to obtain a slurry; Thirdly, adding the foaming agent and the foam stabilizer with required amounts into the prepared slurry, and mixing and stirring to obtain the high-strength ultra-low-density solid-free foam resin slurry.
  8. 8. The resin foam slurry according to claim 7, wherein the stirring state comprises an initial stirring speed of 1000 r to 1200r/min, a stirring speed of 2500 r/min after adding the curing agent, a stirring speed of 1000 r to 1200r/min after stirring for 35s, or/and the stirring state comprises an initial stirring speed of 1000 r to 1200r/min, a stirring speed of 3804 to 1200r/min after adding the coagulant, a stirring speed of 15s after adding the diluent, a stirring speed of 2500 r/min, a stirring speed of 1000 r to 1200r/min after stirring for 35s, and/or/and the stirring state comprises an initial stirring speed of 1000 r to 1200r/min, a stirring speed of 38042 to 4200r/min after adding the foaming agent and the foam stabilizer, and a stirring speed of 30 to 40s.
  9. 9. The high-strength ultra-low-density solid-free foamed resin slurry according to any one of claims 1 to 8, wherein the density of the high-strength ultra-low-density solid-free foamed resin slurry is 0.75g/cm3 to 1.25g/cm3.
  10. 10. A method for producing the high-strength ultra-low-density solid-free foamed resin slurry according to any one of claims 1 to 6, or claim 8 or 9, characterized by comprising the steps of: Firstly, stirring and mixing a required amount of thermosetting resin, adding a curing agent, and uniformly mixing and stirring to obtain resin matrix slurry; Secondly, adding the required amount of coagulant and diluent into the resin matrix slurry in sequence, and mixing and stirring to obtain a slurry; Thirdly, adding the foaming agent and the foam stabilizer with required amounts into the prepared slurry, and mixing and stirring to obtain the high-strength ultra-low-density solid-free foam resin slurry.

Description

High-strength ultra-low density solid-free foam resin slurry and preparation method thereof Technical Field The invention relates to the technical field of foam well cementation of petroleum and natural gas wells, and discloses high-strength ultralow-density solid-free foam resin slurry and a preparation method thereof. Background The well is easy to leak, the low-density long sealing section well usually adopts a large number of hollow microspheres to reduce the cement slurry density for well cementation construction, because the reduction of the cement slurry density by adopting a large number of hollow microspheres is limited, cementing materials are fewer, the stability of the cement slurry is poor, the cement slurry under the ultra-low density exerts the technical problem of slow strength, and because the hollow microspheres have limited self bearing capacity, the deep well and the high-pressure well are pressed against a leaking stratum due to the insufficient bearing capacity of the cement slurry, the well cementation risk is high, and the well cementation construction under the ultra-low density becomes a bottleneck of technical development. The foamed cement slurry has the special properties of low density, low heat conductivity, strong compressibility and the like, is widely used in low density well cementation, and the characteristics of gas channeling prevention and water invasion resistance are one of the effective means adopted by the well cementation of low-pressure easy-leakage wells and low-density long sealing section wells. The Chinese patent document with the publication number of CN104194751A provides a mechanically foaming foam cement slurry, which consists of cement, a surfactant, a foam stabilizer, hollow glass microspheres, a fluid loss agent, a tackifier and water, wherein the mass of the surfactant, the foam stabilizer, the hollow glass microspheres, the fluid loss agent, the tackifier and the water is respectively 0.24-0.4%, 1-1.5%, 6-8.4%, 1-2%, 1-3.5% and 55% of the mass of the cement. The chinese patent publication CN108341609B provides a foam stabilizer composition comprising a C6-C16 alkyl imidazoline, a C8-C16 alkyl amidoalkyl betaine, a C6-C14 alkyl polyglucoside, and a triterpenoid saponin compound. However, most of the foamed cement slurries obtained above are conventional low-density foamed cement slurries. On one hand, because cracks or karst cave development and frequently lost formations of lost circulation are frequently encountered in the well cementation process, the conventional low-density foam cement slurry has less solid-phase cementing material and slow strength exertion, and even has no strength for a few days. On the other hand, with the execution of the production-improving and efficiency-increasing work objective, large-scale fracturing has become a main mode of exploitation, but the low-density foam cement stones with insufficient mechanical properties are easy to break when being impacted by high pressure, so that the long-term sealing integrity of a shaft can not be realized, and finally the oil and gas recovery ratio and the oil and gas well exploitation life are influenced. Therefore, a high-strength ultralow-density cement slurry system needs to be developed to meet the well cementation construction problems of the low-pressure easy-leakage weak stratum with crack property, pore-forming property and high permeability, solve the easy-leakage problem and play the role of protecting the oil-gas layer. Disclosure of Invention The invention provides high-strength ultralow-density solid-free foam resin slurry and a preparation method thereof, overcomes the defects of the prior art, and can effectively solve the problems of difficult well cementation construction, lowered oil and gas recovery ratio and shortened oil and gas well exploitation life caused by poor stability, slow strength exertion and insufficient bearing capacity of cement slurry in the conventional well cementation construction. The technical scheme is that the high-strength ultralow-density solid-free foam resin slurry is realized by adopting the following measures that the raw materials comprise, by mass, 100 parts of thermosetting resin, 15 to 25 parts of curing agent, 10 to 20 parts of setting agent, 5 to 15 parts of diluent, 5 to 10 parts of foaming agent and 1 to 5 parts of foam stabilizer. The following are further optimizations and/or improvements to one of the above-described inventive solutions: the thermosetting resin is one or more of phenolic resin, epoxy resin and unsaturated polyester resin. The curing agent is one or more of anhydride curing agent and resin curing agent. The coagulant is one or more of inorganic salt coagulant and organic coagulant, wherein the inorganic salt coagulant is one of calcium carbonate and sodium carbonate, and the organic coagulant is one of polyacrylamide and polyethyleneimine. The diluent is glycidyl alkyl ether. The foaming agent is one of a c