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CN-122012043-A - Ultrahigh-temperature salt invasion resistant composition containing alkanone derivative for drilling fluid and preparation method thereof

CN122012043ACN 122012043 ACN122012043 ACN 122012043ACN-122012043-A

Abstract

The invention discloses an ultrahigh temperature salt invasion-resistant composition for drilling fluid containing an alkanone derivative and a preparation method thereof, belongs to the technical field of drilling fluid, and solves the problem that the treatment agent identification selectivity of the existing drilling fluid fails under the ultrahigh temperature multi-ion mixed working condition. The composition comprises a functionalized alkanone recognition agent, a high-temperature-resistant multi-site complex polymer, an anti-interference ion regulator and a rheological instability agent, wherein the functionalized alkanone recognition agent contains oxime groups, sulfonic groups and phosphonic groups, and the high-temperature-resistant polymer is a tetrapolymer. The preparation method comprises the steps of preparing the functionalized alkanone recognition agent and the high-temperature resistant polymer, mixing the components, pre-dispersing, curing and drying. The invention can preferentially identify and combine harmful divalent ions at the ultra-high temperature of more than 200 ℃, resist interference ion shielding, and has the advantages of salt invasion resistance and rheological property, controllable process, suitability for complex working conditions such as ultra-deep wells and the like, and good industrial application value.

Inventors

  • Huo sheng
  • LIN MAO
  • LIU XING
  • HUANG YANBING
  • LI DEYUN

Assignees

  • 重庆市天泽钻井材料有限责任公司

Dates

Publication Date
20260512
Application Date
20260415

Claims (8)

  1. 1. The ultra-high temperature salt invasion resistant composition for the drilling fluid containing the alkanone derivative is characterized by comprising 25-40 parts of functionalized alkanone recognition agent, 18-30 parts of high temperature resistant multi-site complex polymer, 6-15 parts of anti-interference ion regulator and 12-25 parts of rheological loss stabilizer; The structural formula of the functionalized alkanone recognition agent is HO-N=C (R2) -CH (R1) -CO-C 6 H 3 (SO 3 M1)(CH 2 PO(OM2) 2 , Wherein R1 is H or CH 3 , R2 is H, CH 3 or CH 2 COOH, M1 and M2 are each independently H, na, K or NH 4 ; The high temperature resistant multi-site complex polymer is a tetrapolymer formed by copolymerization of acrylamide, 2-acrylamido-2-methylpropanesulfonic acid, N-vinyl pyrrolidone and itaconic acid, and the repeated structural unit comprises ：[-CH 2 -CH(CONH 2 )-]、[-CH 2 -C(CH 3 )(CONH-CH 2 -C(CH 3 ) 2 -SO 3 M3)-]、[-CH 2 -CH(N-vinylpyrrolidone)-]、[-CH 2 -C(COOH)(CH 2 COOH)-]; Wherein M3 is H, na, K or NH 4 ; The anti-interference ion regulator is one or two of hydroxyethylidene diphosphonic acid, aminotrimethylene phosphonic acid, polyaspartic acid or sodium citrate; The rheological filter destabilizing agent is a mixture of sulfonated lignite, sulfonated phenolic resin and nano silicon dioxide, wherein the sulfonated lignite is 10-18 parts, the sulfonated phenolic resin is 2-6 parts, and the nano silicon dioxide is 0.5-3 parts.
  2. 2. The ultra-high temperature salt-invasion-resistant composition for drilling fluids containing alkanone derivatives according to claim 1, wherein in the high temperature-resistant multi-site complex polymer, the mole percentage of each monomer is: 30-45 mol% of acrylamide; 22-35 mol percent of 2-acrylamido-2-methylpropanesulfonic acid, 12-22 Mol% of N-vinyl pyrrolidone, 6-15 Mol% of itaconic acid.
  3. 3. A process for preparing an ultra-high temperature salt-penetration resistant composition for drilling fluids containing alkanone derivatives according to any one of claims 1 or 2, comprising the steps of: S1, preparing the functionalized alkanone recognition agent; S2, preparing the high-temperature-resistant multi-site complex polymer; S3, mixing and pre-dispersing the components; S4, curing and drying again to obtain the ultrahigh-temperature salt-invasion-resistant composition for the drilling fluid containing the alkanone derivative.
  4. 4. The method for preparing an ultra-high temperature salt-penetration resistant composition for drilling fluids containing alkanone derivatives according to claim 3, wherein said S1 comprises the steps of: S1.1, sulfonation reaction: Adding 100 parts of acetophenone and 200-400 parts by mass of a solvent into a reactor, wherein the solvent is one of glacial acetic acid, dichloroethane, chloroform and N, N-dimethylformamide, cooling to 0-10 ℃, slowly dropwise adding 80-140 parts by mass of a sulfonating agent which is one of chlorosulfonic acid, fuming sulfuric acid and concentrated sulfuric acid, and heating to 35-60 ℃ for reacting for 2-5 hours after dropwise adding to obtain a sulfonated acetophenone reaction solution; s1.2, phosphonic acid methylation reaction: cooling the sulfonated acetophenone reaction liquid obtained in the step S1.1 to 20-35 ℃, adding 50-120 parts by mass of formaldehyde solution and 60-130 parts by mass of phosphorous acid, adjusting the pH to 1.0-3.0, heating to 70-100 ℃ for reaction for 3-8 hours, and introducing phosphonic acid methyl groups to obtain a phosphonic acid intermediate reaction liquid; s1.3, oximation reaction: adding 80-150 parts by mass of hydroxylamine salt and alkali liquor into the phosphonated intermediate reaction solution obtained in the step S1.2, adjusting the pH value to 4.5-7.0, heating to 50-85 ℃ for reaction for 2-6 hours, and introducing oxime groups to obtain a functionalized alkanone recognition agent crude reaction solution; S1.4, neutralization, purification and drying: Cooling the crude reaction liquid of the functionalized alkanone recognition agent obtained in the step S1.3 to 20-30 ℃, regulating the pH to 6.5-8.5, filtering to remove insoluble substances, concentrating under reduced pressure, adding absolute ethyl alcohol, isopropanol or acetone which is 3-8 times of the volume of the concentrated liquid to precipitate, filtering to obtain a solid, washing the obtained solid with the absolute ethyl alcohol for 2-4 times, and vacuum-drying the solid for 6-18h under the conditions of 50-80 ℃ and minus 0.06- (-0.09) MPa to obtain the functionalized alkanone recognition agent.
  5. 5. The method for preparing an ultra-high temperature salt-penetration resistant composition for drilling fluids containing alkanone derivatives according to claim 4, wherein in S1.1, the molar ratio of acetophenone to sulfonating agent is 1:0.8-1:1.5; in the S1.2, the molar ratio of the sulfonated acetophenone to the formaldehyde to the phosphorous acid is 1:1.0-2.5:1.0-2.5, the mass concentration of the formaldehyde solution is 30-40wt%, and the phosphorous acid can be replaced by phosphorous acid; In the step S1.3, the hydroxylamine salt is hydroxylamine hydrochloride or hydroxylamine sulfate, the molar ratio of the phosphonated intermediate to the hydroxylamine salt is 1:1.0-2.0, and the alkali liquor is one of sodium hydroxide solution, potassium hydroxide solution or ammonia water.
  6. 6. The method for preparing an ultra-high temperature salt-penetration resistant composition for drilling fluids containing alkanone derivatives according to claim 3, wherein said S2 comprises the steps of: s2.1, adding acrylamide, 2-acrylamide-2-methylpropanesulfonic acid, N-vinyl pyrrolidone and itaconic acid into deionized water, and adjusting the pH to 6-8; S2.2, adding a free radical initiator under the protection of nitrogen, and polymerizing for 4-8 hours at 55-75 ℃ to obtain a high-temperature-resistant multi-site complex polymer solution; S2.3, precipitating, washing and drying the polymer solution to obtain the high-temperature-resistant multi-site complex polymer.
  7. 7. The method for preparing an ultra-high temperature salt-penetration resistant composition for drilling fluids containing alkanone derivatives according to claim 3, wherein said S3 comprises the steps of: S3.1, putting the functionalized alkanone recognition agent, the high-temperature-resistant multi-site complex polymer, the anti-interference ion regulator and the rheological loss stabilizer into mixing equipment according to a formula; S3.2, stirring for 0.5-2h at 40-70 ℃ to obtain the pre-dispersed compound material.
  8. 8. The method for preparing an ultra-high temperature salt-penetration resistant composition for drilling fluids containing alkanone derivatives according to claim 7, wherein said S4 comprises the steps of: S4.1, curing the pre-dispersed compound material at 50-80 ℃ for 1-4 hours; s4.2, spray drying or vacuum drying the cured material; S4.3, crushing and sieving the dried material to obtain the ultrahigh temperature salt invasion resistant composition for the drilling fluid containing the alkanone derivative.

Description

Ultrahigh-temperature salt invasion resistant composition containing alkanone derivative for drilling fluid and preparation method thereof Technical Field The invention belongs to the technical field of drilling fluid, and particularly relates to an ultrahigh-temperature salt-invasion-resistant composition containing an alkanone derivative for drilling fluid and a preparation method thereof. Background With the extension of oil and gas exploration and development to extreme fields such as ultra-deep wells, ultra-deep water, complex broken blocks, geothermal wells and the like, the severity of drilling conditions is continuously upgraded, wherein the synergistic effect of ultra-high temperature and high salt invasion becomes a core bottleneck for restricting the stability of drilling fluid performance and guaranteeing the drilling safety. At present, the ultra-deep well drilling depth is generally more than 6000m, the downhole temperature can reach more than 200 ℃, the drilling temperature of a part of geothermal well and dry rock is even up to 250 ℃, meanwhile, the phenomena of multi-type stratum fluid channeling, stratum mineral dissolution and the like often exist in a complex stratum, the drilling fluid system is caused to face the problem of salt invasion caused by various ion mixing, and extremely high technical challenges are brought to the salt invasion resistance of the drilling fluid. The drilling fluid is used as the 'blood' of the drilling engineering, the performance stability of the drilling fluid directly determines the drilling efficiency, the well wall stability and the reservoir protection effect, and the salt invasion resistance is one of the core indexes of the ultra-high temperature complex stratum drilling fluid. The salt invasion mainly originates from contact of stratum fluid and drilling fluid, when the drilling fluid penetrates through different lithology stratum in the drilling process, the drilling fluid is contacted with various stratum fluids at the same time, and specific scenes comprise that in a carbonate reservoir under ultra-deep salt, the drilling fluid is contacted with CaCl 2/MgCl2 dissolved out of high-concentration NaCl stratum brine and cream salt, HCO 3-/CO32- dissolved out of carbonate rock and dissolved CO 2 at the same time, and complex fault block oil-gas fields are communicated by faults, so that upper shallow fresh water, middle salt stratum brine and lower sulfur/CO 2 -containing stratum fluid are simultaneously returned out, the drilling fluid becomes a multi-ion hybrid system, in geothermal wells and dry and hot rock drilling, the polyanions such as NaCl, ca 2+、F-、B4O72- and the like carried by the geothermal fluid coexist with the polycation, and in shale gas ultra-long horizontal section drilling, the drilling fluid is mixed with stratum water, fracturing flowback fluid and crude oil organic acid at the same time, and a complex system with double interference of organic micromolecules and inorganic ions is formed. Under the working conditions of ultrahigh temperature and multi-ion mixing, the problem of selective failure of ion-molecule specific recognition exists in the drilling fluid treatment agents (such as filtrate loss reducer, inhibitor, chelating agent and the like). The existing drilling fluid treating agent molecules are all designed with specific binding sites, and the core design is to preferentially chelate or repel divalent ions (such as Ca 2+、Mg2+) harmful to the performance of the drilling fluid, so that the problems of drilling fluid sticking mutation, increased filtration loss, mud cake quality deterioration and the like caused by the ions are avoided, and meanwhile, the erosion of monovalent ions (such as Na +、K+) is resisted. However, in an ultra-high temperature (more than 200 ℃), the binding sites of the treating agent molecules are disordered in recognition, and the specific binding capacity of the treating agent molecules to Ca 2+、Mg2+ is obviously reduced, harmless or low-harmful monovalent ions are preferentially bound, and part of interfering ions (such as HCO 3-、CO32- and organic acid radicals) can wrap target harmful ions or shield the recognition sites of the treating agent, so that the treating agent cannot effectively capture Ca 2+、Mg2+, finally, the salt invasion resistance failure of the drilling fluid is caused, and serious drilling accidents such as well wall collapse, stuck drilling and reservoir damage occur. At present, the existing ultrahigh-temperature salt-resistant drilling fluid treatment agents in the industry mainly comprise sulfonated polymers (such as sulfonated phenolic resin and sulfonated lignite), polyacrylamide derivatives, organic phosphines and the like, and the design ideas of the treatment agents are focused on improving the tolerance of single salts (such as NaCl and CaCl 2), so that the problem of performance deterioration caused by single ion erosion can be solved, and the problem of selective fai