CN114214049A - Preparation method of solid-free tackifying workover fluid for ultra-deep ultra-high temperature oil and gas wells - Google Patents

Preparation method of solid-free tackifying workover fluid for ultra-deep ultra-high temperature oil and gas wells Download PDF

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CN114214049A
CN114214049A CN202210058882.1A CN202210058882A CN114214049A CN 114214049 A CN114214049 A CN 114214049A CN 202210058882 A CN202210058882 A CN 202210058882A CN 114214049 A CN114214049 A CN 114214049A
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田疆
孟祥豪
何希高
曾光玉
钟传蓉
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Chengdu Univeristy of Technology
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    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/02—Well-drilling compositions
    • C09K8/03—Specific additives for general use in well-drilling compositions
    • C09K8/035—Organic additives
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/02—Well-drilling compositions
    • C09K8/03—Specific additives for general use in well-drilling compositions
    • C09K8/032—Inorganic additives

Abstract

The invention discloses a preparation method of a solid-free tackified workover fluid for an ultra-deep ultra-high temperature oil and gas well, which is characterized in that the components are calculated according to weight, 0.3-20 parts of thickening agent is slowly poured into at least one of 1000 parts of clear water and formation water which are stirred at normal temperature, then the stirring is continued until the thickening agent is completely dissolved to obtain a polymer solution with tackifying performance, in the stirring process, 0.05-10 parts of ultra-high temperature polymer cross-linking agent and 0.5-100 parts of ultra-high temperature polymer stabilizing agent are sequentially added into the prepared thickening agent solution, then 0.1-10 parts of bactericide is added into the stirring process and the stirring is continued to be uniform, then 0.1-10 parts of ultra-high temperature heat stabilizer are continuously added and the mixing is uniform, and finally 0.5-4000 parts of density regulator is added to obtain the viscosity of 1.01-2.50 g/cm3The solid-free workover fluid can be applied to ultra-deep ultra-high temperature oil and gas wells with the bottom temperature of 180-240 ℃, and has good increment at ultra-high temperatureViscosity, ageing resistance, temperature resistance, sand washing and rock carrying performance and filtration loss reduction.

Description

Preparation method of solid-free tackifying workover fluid for ultra-deep ultra-high temperature oil and gas wells
One, the technical field
The invention relates to a preparation method of a solid-free tackifying workover fluid for an ultra-deep ultra-high temperature oil and gas well, belonging to the fields of oil exploitation, oilfield chemistry and oilfield macromolecules.
Second, background Art
In the Xinjiang oil and gas exploitation in China, a large number of ultra-deep ultra-high temperature oil and gas wells need to be exploited every year after long-term exploitationNormal production of oil and gas wells can be guaranteed only by workover operations, the average well depth of the oil and gas wells exceeds 6000m, the well depth of some wells reaches 8000m, the bottom temperature reaches 180 ℃ or above, for example, the bottom temperature of some wells reaches 210 ℃. In order to save cost and protect a reservoir in an oil field, at present, hypersalinity oil field formation water is generally used as a workover fluid in a construction site, or soluble inorganic salt or clear water is added into the oil field formation water to adjust the density of solid-free brine. But the solid-free saline workover fluid has the defects that the leakage is serious because the solution has no thickening property, and the leakage in one-time workover can reach 1000m for a vicious leakage well3On the left and right sides, and for a fracture-karst cave oil well with obvious constant volume characteristics, the stratum is suppressed due to a large amount of leakage of brine, and secondary well killing is difficult. In addition, the density of the brine is greatly influenced by the temperature, so that the safety density window of the workover fluid is narrow, the density of the workover fluid is difficult to control effectively, the density of the workover fluid is slightly high, the loss is serious, and the density of the workover fluid is slightly low, so that the workover fluid cannot be well pressed. The viscosity of the solid-free brine workover fluid is also extremely low, the suspension capacity is extremely weak, and the sand and rock washing performance is poor. In order to ensure the safety of workover treatment, obviously reduce the leakage of workover fluid at the well bottom, improve the sand and rock carrying performance of the workover fluid and improve the operation time efficiency, water-soluble cellulose ether such as sodium carboxymethyl cellulose, polyanionic sodium cellulose, hydroxyethyl cellulose and the like and xanthan gum can be added into the solid-free saline workover fluid to obviously improve the tackifying performance of the workover fluid. The water-soluble cellulose ether has a high apparent viscosity in solution at neutral or slightly alkaline temperatures, but is severely degraded at temperatures above 100 ℃ at the bottom of the well, and the viscosifying properties are almost completely lost. The xanthan gum has higher thermal stability than water-soluble cellulose ether, is used as a thickening agent in saline water, has obvious pseudoplasticity, is beneficial to sand washing and rock carrying at the bottom of a well, has good lubricity for well workover tools, but can be seriously degraded under a super-high temperature well with the temperature higher than 140 ℃, and the viscosity of the solution is sharply reduced. The addition of potassium formate or sodium formate with a mass percentage concentration higher than 30% can improve the high-temperature thermal stability of the xanthan gum saline solution to a certain extent, but the anti-aging temperature is lower than 180 ℃, and in addition, the use of high-concentration potassium formate or sodium formate obviously increases the cost of the workover fluid. Thus, it is possible to provideThe water-soluble cellulose ether and the xanthan gum can not be used for the well repairing operation of the ultra-deep ultra-high temperature oil and gas well with the bottom temperature of more than 180 ℃, and the well repairing liquid has the problems that the well repairing operation of the ultra-deep ultra-high temperature oil and gas well is difficult, the well repairing working period is long, and the well repairing cost is always high, so that the development of the well repairing liquid of the ultra-deep ultra-high temperature oil and gas well has important application value for improving the well repairing operation technology. Wule et al, drilling and completion fluids, 2011, 28(6), 77-80, reported xanthan gum at a mass percent concentration of 76% and a density of 1.59g/cm3The temperature of the saturated potassium formate salt aqueous solution for 16 hours is 180 ℃, but after the aging temperature is higher than 180 ℃, the xanthan gum is oxidized and degraded, and the solution has almost no thickening property. In 2016, Liufupeng and the like disclose a viscosifier for workover fluid and a manufacturing method (Chinese patent CN 105820803A). in the workover fluid, xanthan gum is used as the viscosifier, and aiming at the problem that the high-temperature stability limit of the xanthan gum is 120 ℃, potassium formate is added into the workover fluid to improve the use temperature of the workover fluid, but the use temperature is only increased to 140 ℃. Xijun et al, proceedings of Shandong science and technology university, 2007, 26(5), 33, 16-20, reported that Ca is at a higher concentration at 120 ℃2+The xanthan gum solution is promoted to be oxidized and degraded to cause the solution to lose efficacy, the viscosity loss of the solution is increased along with the prolonging of the aging time and the increase of the ambient temperature, and in addition, Fe in the system2+、Fe3+Xanthan gum can also be severely degraded at high temperatures, causing loss of viscosifying properties of the workover fluid.
Third, the invention
The invention aims to solve the problem that the anti-aging temperature of xanthan gum which is a tackifier commonly used in the existing workover fluid does not exceed 180 ℃ even when potassium formate which is a high-concentration high-temperature stabilizer is added, so that the existing solid-free tackifying saline workover fluid is difficult to be applied to the workover construction site of an oil and gas well with the ultrahigh temperature of 180-240 ℃, and provides a preparation method of a solid-free workover fluid which has good tackifying property, sand washing lithologic property and filtration loss reducing property under the ultra-deep ultrahigh-temperature well bottom environment with the temperature of 180 ℃ and above and can balance the stratumAt least one thickening agent which can be prepared by at least one of clean water and oil field formation water, at least one of divinylbenzene, divinylbiphenyl, divinylnaphthalene, diethylenetriamine, hexamethylenediamine, 1, 6-hexanediol, 1, 5-pentanediol, oligomeric phenolic resin, benzaldehyde, formaldehyde, phenol, naphthol, catechol, resorcinol, hydroquinone and hexamethylenetetramine is used as an ultrahigh temperature polymer crosslinking agent, at least one of sodium hexametaphosphate, phenanthroline, triethanolamine, trisodium citrate, tetrasodium ethylenediaminetetraacetate, sodium formate, potassium formate, sodium acetate, potassium acetate, sodium propionate, potassium propionate, sodium 2-hydroxypropionate and trisodium nitrilotriacetate is used as an ultrahigh temperature polymer stabilizer, and at least one of malonaldehyde, succinaldehyde, glutaraldehyde, hexanedial, sodium trichlorophenolate, sodium bisulfide and potassium bisulfide is used as a bactericide, with sodium borohydride (NaBH)4) Potassium borohydride (KBH)4) Sodium dithionite (Na)2S2O4) Potassium dithionite (K)2S2O4) Sodium bisulfite (NaHSO)3) Potassium hydrogen sulfite (KHSO)3) Sodium sulfite (Na)2SO3) Potassium sulfite (K)2SO3) Sodium sulfide (Na)2S), potassium sulfide (K)2S), thiourea, o-xylene thiourea, isopropanol, n-propanol, isobutanol, n-butanol, isoamyl alcohol, n-pentanol, isohexanol and n-hexanol as ultra-high temperature heat stabilizer, and sodium chloride (NaCl), potassium chloride (KCl) and calcium chloride (CaCl)2) Sodium bromide (NaBr), potassium bromide (KBr), calcium bromide (CaBr)2) And zinc bromide is a density modifier.
The inventor finds that the thickening agent concentration, the polyvalent metal cation content and the additive dosage in the solid-free workover fluid of the ultra-deep ultra-high temperature oil and gas well can obviously influence the thickening property of the solid-free workover fluid.
The aim of the invention is realized by the following technical measures, wherein the parts of the raw materials are parts by weight except for special specifications.
1. The formula of the solid-free workover fluid for the ultra-deep ultra-high temperature oil and gas well comprises the following components:
Figure BDA0003477391400000021
wherein the solvent is at least one of clear water and oil field formation water, the thickener is at least one of gellan gum, welan gum, rhamsan gum, scleroglucan and diutan, the ultrahigh-temperature polymer crosslinking agent is at least one of divinylbenzene, divinylbiphenyl, divinylnaphthalene, diethylenetriamine, hexanediamine, 1, 6-hexanediol, 1, 5-pentanediol, oligomeric phenolic resin, benzaldehyde, formaldehyde, phenol, naphthol, catechol, resorcinol, hydroquinone and hexamethylenetetramine, the ultrahigh-temperature polymer stabilizer is at least one of sodium hexametaphosphate, phenanthroline, triethanolamine, trisodium citrate, tetrasodium ethylenediaminetetraacetate, sodium formate, potassium formate, sodium acetate, potassium acetate, sodium propionate, potassium propionate, sodium 2-hydroxypropionate and trisodium nitrilotriacetate, and the bactericide is at least one of malonaldehyde, sodium propionate, potassium propionate, sodium 2-hydroxypropionate and trisodium nitrilotriacetate, At least one of succinaldehyde, glutaraldehyde, hexanedial, sodium trichlorophenolate, sodium and potassium disulfides, and the ultra-high temperature heat stabilizer is sodium borohydride (NaBH)4) Potassium borohydride (KBH)4) Sodium dithionite (Na)2S2O4) Potassium dithionite (K)2S2O4) Sodium bisulfite (NaHSO)3) Potassium hydrogen sulfite (KHSO)3) Sodium sulfite (Na)2SO3) Potassium sulfite (K)2SO3) Sodium sulfide (Na)2S), potassium sulfide (K)2S), thiourea, o-xylene thiourea, isopropanol, n-propanol, isobutanol, n-butanol, isoamyl alcohol, n-pentanol, isohexanol and n-hexanol, and the density regulator is at least one of sodium chloride (NaCl), potassium chloride (KCl) and calcium chloride (CaCl)2) Sodium bromide (NaBr), potassium bromide (KBr), calcium bromide (CaBr)2) And zinc bromide.
2. Preparation of solid-free workover fluid for ultra-deep ultra-high temperature oil and gas well
Slowly pouring 0.3-20 parts of thickening agent into 1000 parts of solvent in stirring at normal temperature, and then continuously stirringAnd until the solution is completely dissolved to obtain a polymer solution with tackifying performance, sequentially adding 0.05-10 parts of ultra-high temperature polymer cross-linking agent and 0.5-100 parts of ultra-high temperature polymer stabilizer into the prepared thickener solution in the stirring process, adding 0.1-10 parts of bactericide into the thickener solution in the stirring process, continuously stirring the mixture uniformly, then continuously adding 0.1-10 parts of ultra-high temperature heat stabilizer into the mixture, uniformly mixing the mixture, and finally adding 0.5-4000 parts of density regulator into the mixture to obtain the polymer solution with the density of 1.01-2.50 g/cm3The solid-free workover fluid can be applied to ultra-deep ultra-high temperature oil and gas wells with the bottom temperature of 180-240 ℃.
Wherein the solvent is at least one of clear water and oil field formation water, the thickener is at least one of gellan gum, welan gum, diutan, rhamsan gum, scleroglucan and diutan, the ultrahigh-temperature polymer crosslinking agent is at least one of divinylbenzene, divinylbiphenyl, divinylnaphthalene, diethylenetriamine, hexanediamine, 1, 6-hexanediol, 1, 5-pentanediol, oligomeric phenolic resin, benzaldehyde, formaldehyde, phenol, naphthol, catechol, resorcinol, hydroquinone and hexamethylenetetramine, the ultrahigh-temperature polymer stabilizer is at least one of sodium hexametaphosphate, phenanthroline, triethanolamine, trisodium citrate, tetrasodium ethylenediaminetetraacetate, sodium formate, potassium formate, sodium acetate, potassium acetate, sodium propionate, potassium propionate, sodium 2-hydroxypropionate and trisodium nitrilotriacetate, and the bactericide is malonaldehyde, At least one of succinaldehyde, glutaraldehyde, hexanedial, sodium trichlorophenolate, sodium and potassium disulfides, and the ultra-high temperature heat stabilizer is sodium borohydride (NaBH)4) Potassium borohydride (KBH)4) Sodium dithionite (Na)2S2O4) Potassium dithionite (K)2S2O4) Sodium bisulfite (NaHSO)3) Potassium hydrogen sulfite (KHSO)3) Sodium sulfite (Na)2SO3) Potassium sulfite (K)2SO3) Sodium sulfide (Na)2S), potassium sulfide (K)2S), thiourea, o-xylene thiourea, isopropanol, n-propanol, isobutanol, n-butanol, isoamyl alcohol, n-pentanol, isohexanol and n-hexanol, and the density regulator is at least one of chlorineSodium chloride (NaCl), potassium chloride (KCl), and calcium chloride (CaCl)2) Sodium bromide (NaBr), potassium bromide (KBr), calcium bromide (CaBr)2) And zinc bromide.
3. Performance of solid-free workover fluid for ultra-deep ultra-high temperature oil and gas well
The following preparation method of the sample of the solid-free workover fluid for the ultra-deep ultra-high temperature oil and gas well is shown in example 1. It is to be noted here that the following description of the properties of the sample of solids-free workover fluid prepared in accordance with example 1 is intended only to illustrate the present invention and is not to be construed as limiting the scope of the present invention, and that the present invention may be modified and adapted by those skilled in the art in light of the teachings herein.
(1) The relation between the apparent viscosity and the testing temperature of the solid-free workover fluid of the ultra-deep ultra-high temperature oil and gas well is shown in table 1. When the temperature is lower than 90 ℃, the apparent viscosity of the solid-free workover fluid slightly increases along with the increase of the test temperature, and slowly decreases after the temperature is higher than 90 ℃, but the influence of the temperature on the apparent viscosity of the solid-free workover fluid is small in the whole temperature range. The result shows that the solid-free workover fluid has good temperature resistance.
(2) The relationship between the apparent viscosity and the aging temperature of the solid-free workover fluid of the ultra-deep ultra-high temperature oil and gas well is shown in Table 2. The aging time for all samples was 16 h. The viscosity of the ultra-deep ultra-high temperature oil and gas well solid-free workover fluid after aging for 16 hours at the ultra-high temperature of 190 ℃ and 220 ℃ is higher than that before aging, because at the ultra-high temperature, the thickening agent and the ultra-high temperature polymer cross-linking agent generate chemical cross-linking effect at first, the viscosity of the system is obviously increased, then along with the increase of the aging time, the viscosity of the system is reduced, the aging temperature is higher, the reduction range is larger, and the viscosity is still higher than that before aging, so that the solid-free workover fluid has good sand washing and rock carrying performance and filtration loss reduction performance under the ultra-high temperature stratum. The result shows that the crosslinked polymer after the thickener and the crosslinking agent have chemical action has good ultrahigh-temperature anti-aging performance and tackifying performance at ultrahigh temperature, and can resist high-concentration Fe in formation water3+、Fe2+、Ca2+And Mg2+Wait for manyA metal cation of valence.
(3) The apparent viscosity of the ultra-deep ultra-high temperature oil and gas well solid-free workover fluid at different shear rates after being aged at 190 ℃ for 16h is shown in Table 3. The values of the fluidity index n in table 3 are well below 1 and the value of the consistency coefficient K is high, which indicates that the thickener in the workover fluid shows good pseudoplasticity and thickening after chemical crosslinking at ultrahigh temperature. This results in low apparent viscosity and low friction at high shear rates in the wellbore, but significantly increased apparent viscosity at lower annular shear rates, which is beneficial for sand wash and rock carrying. The result shows that the solid-free workover fluid aged for 16 hours at the ultrahigh temperature shows good pseudoplastic behavior, and the solid-free workover fluid has good sand washing and rock carrying properties under the ultrahigh-temperature stratum.
The solid-free workover fluid for the ultra-deep ultra-high temperature oil and gas well has the following advantages:
(1) the solid-free workover fluid for the ultra-deep ultra-high temperature oil and gas well still can show good tackifying property, sand washing rock carrying property and filtration loss reduction property when the bottom temperature is 180-240 ℃, and can resist high concentration Fe in formation water at ultra-high temperature3+、Fe2+、Ca2+And Mg2+And the like polyvalent metal cations.
(2) The thickening agents in the workover fluid system are all biological macromolecules, the thermal stability of the thickening agents is higher than that of xanthan gum which is commonly used at present, the biological macromolecules in the workover fluid system can be well chemically crosslinked with the crosslinking agents in formation water under the ultrahigh-temperature bottom hole environment under the combined action of all the additives, bactericides in the system can prevent bacteria from breeding, and the ultrahigh-temperature stabilizing agents can absorb trace oxygen in the system to avoid oxidative degradation of the thickening agents.
(3) The ultrahigh-temperature polymer cross-linking agents almost contain rigid and temperature-resistant aromatic ring structures, so that after one or more of the cross-linking agents and a thickening agent in a system are subjected to chemical cross-linking under an ultrahigh-temperature deep well, the molecular weight of a high polymer is remarkably increased, the temperature-resistant aromatic ring structures are introduced into the cross-linked high polymer, and the viscosity increasing property, the rigidity and the temperature resistance of a high molecular chain are remarkably enhanced, so that the molecular structure of the high-temperature polymer is stable at ultrahigh temperature.
(4) The ultra-high temperature polymer stabilizer can complex polyvalent metal cations, can inhibit the salt effect of the polyvalent metal cations on the thickener, and can be used for neutralizing-COO in molecules of the stabilizer—The connected C-H has polarity and can generate intermolecular interaction with-OH in the molecular chain of the thickener, so that more hydrophilic groups-COO can be physically introduced into the molecular chain of the thickener—The thickening agent still has strong water solubility at ultrahigh temperature, and the crosslinked biological polymer has a good aggregation structure in hypersalinity brine at ultrahigh temperature and cannot be precipitated out, so that the solid-free workover fluid has good thickening property at the bottom of an ultra-deep ultrahigh-temperature oil-gas well.
Fourth, detailed description of the invention
The present invention is described in detail below by way of examples, it should be noted that the examples are only for the purpose of further illustration, and are not to be construed as limiting the scope of the present invention, and that the present invention may be modified and adapted by those skilled in the art in light of the above teachings.
Example 1
At normal temperature, 3g of welan gum and 2 g of diutan gum are respectively slowly poured into 1000 g of stirred formation water, and the formation water contains 163g/L of sodium chloride, 33g/L of calcium chloride, 4g/L of magnesium chloride, 60mg/L of ferric chloride and 10mg/L of ferrous chloride, and then stirring is continued until the welan gum and the diutan gum are completely dissolved. In the stirring process, 0.2 g of phenol, 0.8 g of m-phenol and 0.5 g of formaldehyde are added into the prepared thickener solution, 6g of tetrasodium ethylene diamine tetraacetate, 10 g of sodium formate, 20 g of potassium formate and 10 g of potassium propionate are added, 1 g of glutaraldehyde and 1 g of sodium bisulfide are added in the stirring process respectively and are stirred continuously, 2 g of sodium sulfide and 3g of isopropanol are added continuously and are mixed uniformly, and 5 g of sodium chloride is added finally to adjust the density of the workover fluid to obtain the density of 1.158g/cm3The solid-free workover fluid can be applied to ultra-deep ultra-high temperature oil and gas wells with the bottom temperature of 180-240 ℃.
Example 2
At normal temperature, 3g of rhamnon glue and chitosan are mixed5 grams of welan gum was slowly poured into 1000 grams of water under stirring, and then stirring was continued until completely dissolved. During stirring, 1 g of oligomeric phenolic resin is added into the prepared thickener solution, 2 g of triethanolamine, 5 g of nitrilotriacetic acid trisodium and 40 g of potassium formate are added, 1 g of glutaraldehyde and 0.5 g of sodium trichlorophenolate are added during stirring respectively, stirring is continued to be uniform, 1 g of thiourea and 0.5 g of sodium hydrosulfite are added continuously and mixed uniformly, and 100 g of sodium chloride and 25 g of calcium chloride are added finally to adjust the density of the workover fluid to obtain the density of 1.146g/cm3The solid-free workover fluid can be applied to ultra-deep ultra-high temperature oil and gas wells with the bottom temperature of 180-240 ℃.
Example 3
At normal temperature, 3g of gellan gum and 5 g of welan gum are slowly poured into 1000 g of water under stirring, and then stirring is continued until completely dissolved. In the stirring process, 0.3 g of divinylbenzene, 0.5 g of hydroquinone and 0.5 g of hexamethylenetetramine are added into the prepared thickener solution, 10 g of sodium hexametaphosphate, 6g of trisodium citrate and 20 g of potassium formate are added, 1 g of succinaldehyde and 4g of sodium carbamate are added in the stirring process respectively and are continuously stirred uniformly, then 3g of sodium dithionite and 3g of o-xylenethiourea are added continuously and are mixed uniformly, and finally 200 g of sodium chloride and 800 g of calcium bromide are added to adjust the density of the workover fluid to obtain the density of 1.687g/cm3The solid-free workover fluid can be applied to ultra-deep ultra-high temperature oil and gas wells with the bottom temperature of 180-240 ℃.
Example 4
At normal temperature, 10 g of rhamnosan gum and 5 g of welan gum are slowly poured into 1000 g of stirred water respectively, and then stirring is continued until complete dissolution. In the stirring process, 0.5 g of diethylenetriamine, 0.8 g of phenol and 0.5 g of formaldehyde are added into the prepared thickener solution, 10 g of sodium 2-hydroxypropionate, 30 g of sodium formate and 10 g of potassium acetate are added, 2 g of glutaraldehyde and 1 g of malonaldehyde are added in the stirring process respectively, the stirring is continued to be uniform, then 2 g of sodium sulfite and 6g of o-xylylurea are added continuously, the mixing is uniform, and finally, the sodium sulfite and the o-xylylurea are added200 g of sodium chloride and 200 g of calcium bromide are added to adjust the density of the workover fluid to obtain a density of 1.307g/cm3The solid-free workover fluid can be applied to ultra-deep ultra-high temperature oil and gas wells with the bottom temperature of 180-240 ℃.
Example 5
At normal temperature, 5 g of scleroglucan, 5 g of gellan gum and 8g of welan gum are respectively and slowly poured into 1000 g of stirred formation water, wherein the formation water contains 163g/L of sodium chloride, 33g/L of calcium chloride, 4g/L of magnesium chloride, 60mg/L of ferric chloride and 10mg/L of ferrous chloride, and then stirring is continued until the scleroglucan, the gellan gum and the welan gum are completely dissolved. In the stirring process, 0.6 g of oligomeric phenolic resin is added into the prepared thickener solution, 5 g of tetrasodium ethylenediamine tetraacetate, 10 g of potassium formate and 20 g of sodium propionate are added, 1 g of hexanedial and 1 g of pyrocatechol are added into the thickener solution respectively in the stirring process, the mixture is continuously stirred uniformly, then 0.5 g of thiourea and 1 g of sodium borohydride are continuously added into the mixture and mixed uniformly, and finally 5 g of sodium chloride is added into the mixture to adjust the density of the workover fluid to obtain the density of 1.160g/cm3The solid-free workover fluid can be applied to ultra-deep ultra-high temperature oil and gas wells with the bottom temperature of 180-240 ℃.
Description of the attached tables
TABLE 1 test of the effect of temperature on apparent viscosity of a solid-free workover fluid before aging
Figure BDA0003477391400000061
Note: shear rate of 170.3s-1
TABLE 2 Effect of different aging temperatures on apparent viscosity of a solid free workover fluid
Figure BDA0003477391400000062
Note: and (3) testing temperature: shear rate 170.3s at 30 DEG C-1Aging time: 16h
TABLE 3190 ℃ apparent viscosity and rheological parameters of the sample after aging for 16h
Figure BDA0003477391400000063
Note: and (3) testing temperature: at 30 ℃, the fluidity index n is a dimensionless quantity, and the unit of the consistency coefficient K is Pa.sn。

Claims (1)

1. A preparation method of a solid-free tackifying workover fluid for an ultra-deep ultra-high temperature oil and gas well is characterized by comprising the following steps:
according to the weight, at normal temperature, 0.3-20 parts of thickening agent is slowly poured into 1000 parts of solvent in stirring, then stirring is continued until the thickening agent is completely dissolved to obtain polymer solution with tackifying performance, in the stirring process, 0.05-10 parts of ultra-high temperature polymer cross-linking agent and 0.5-100 parts of ultra-high temperature polymer stabilizing agent are sequentially added into the prepared thickening agent solution, then 0.1-10 parts of bactericide is added in the stirring process, stirring is continued to be uniform, then 0.1-10 parts of ultra-high temperature heat stabilizer are continuously added and mixed to be uniform, finally 0.5-4000 parts of density regulator is added to obtain the polymer with density of 1.01-2.50 g/cm3The solid-free workover fluid can be applied to ultra-deep ultra-high temperature oil and gas wells with the bottom temperature of 180-240 ℃;
wherein the solvent is at least one of clear water and oil field formation water, the thickener is at least one of gellan gum, welan gum, diutan, rhamsan gum, scleroglucan and diutan, the ultrahigh-temperature polymer crosslinking agent is at least one of divinylbenzene, divinylbiphenyl, divinylnaphthalene, diethylenetriamine, hexanediamine, 1, 6-hexanediol, 1, 5-pentanediol, oligomeric phenolic resin, benzaldehyde, formaldehyde, phenol, naphthol, catechol, resorcinol, hydroquinone and hexamethylenetetramine, the ultrahigh-temperature polymer stabilizer is at least one of sodium hexametaphosphate, phenanthroline, triethanolamine, trisodium citrate, tetrasodium ethylenediaminetetraacetate, sodium formate, potassium formate, sodium acetate, potassium acetate, sodium propionate, potassium propionate, sodium 2-hydroxypropionate and trisodium nitrilotriacetate, and the bactericide is malonaldehyde, The high-temperature heat stabilizer is at least one of sodium borohydride, potassium borohydride, sodium dithionite, potassium dithionite, sodium bisulfite, potassium bisulfite, sodium sulfite, potassium sulfite, sodium sulfide, potassium sulfide, thiourea, orthodiphenylthiourea, isopropanol, n-propanol, isobutanol, n-butanol, isoamyl alcohol, n-pentanol, isohexanol and n-hexanol, and the density regulator is at least one of sodium chloride, potassium chloride, calcium chloride, sodium bromide, potassium bromide, calcium bromide and zinc bromide.
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