CN114214049B - 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 PDFInfo
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Abstract
Disclosure of the inventionA preparation method of a solid-free tackified workover fluid for an ultra-deep ultra-high temperature oil and gas well 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 is continuously added and the mixing is uniform, finally 0.5-4000 parts of density regulator is added to obtain the viscosity of 1.01-2.50 g/cm 3 The solid-free workover fluid can be applied to an ultra-deep ultra-high temperature oil and gas well with the bottom temperature of 180-240 ℃, and has good tackifying property, ageing resistance, temperature resistance, sand washing rock carrying property and filtration loss reduction property at the ultra-high temperature.
Description
1. Field of the invention
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.
2. Background of the invention
In the oil and gas exploitation in Xinjiang in China, after long-term exploitation, a large number of ultra-deep ultra-high temperature oil and gas wells need to be repaired every year to ensure the normal production of the oil and gas wells, 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, and 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. However, the solid-free saline workover fluid has the defects that the loss is serious because the solution has no viscosity increasing property, and the loss in one-time workover can reach 1000m for a vicious lost well 3 On 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 washing and rock carrying properties are 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. Water-soluble cellulose ethers have a high apparent solution viscosity at neutral or slightly alkaline temperatures, but degrade dramatically at temperatures above 100 ℃ downhole, with almost complete loss of viscosifying properties. 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. Therefore, the 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. Wu Le et al, drilling and completion fluids 2011, 28 (6), 77-80, report xanthan gum at a mass percent concentration of 76% and a density of 1.59g/cm 3 The 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, liu Fupeng and the like disclose a viscosifier for workover fluid and a manufacturing method thereof (Chinese patent CN 105820803A). Xanthan gum is used as the viscosifier in the workover fluid, and potassium formate is added into the workover fluid to improve the stability of the xanthan gum at a high temperature of 120 ℃ against the problem that the high-temperature stability limit of the xanthan gum is highThe working fluid is used at a temperature, but the maximum temperature of the working fluid is only increased to 140 ℃. Xie Jun et al, proceedings of Shandong science and technology university, 2007, 26 (5), 33, 16-20, reported that Ca is present at a higher concentration at 120 deg.C 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 increasing of the ambient temperature, and in addition, fe in the system 2+ 、Fe 3+ Xanthan gum can also be severely degraded at high temperatures, causing loss of viscosifying properties of the workover fluid.
3. Summary of 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 current workover fluid does not exceed 180 ℃ even when potassium formate which is a high-temperature stabilizer is added, so that the current solid-free tackifying brine workover fluid is difficult to be applied to oil and gas well workover construction sites with ultra-high temperature of 180-240 ℃, and provides a preparation method of a solid-free workover fluid which has good tackifying property, sand flushing lithocarrying property and filtration loss reduction property under the ultra-deep ultra-high temperature well bottom environment of 180 ℃ and above and can balance the stratum, and the preparation method is characterized in that at least one of gellan gum, welan gum, rhamsan gum, micronucleus glucan and diutan gum is used as a thickener, can be prepared by using at least one of divinylbenzene, divinylbiphenyl, divinylnaphthalene, diethylenetriamine, hexamethylenediamine, 3238 zft 3238-hexanediol, 1,5-pentanediol, oligomeric phenolic resin, benzaldehyde, formaldehyde, phenol, resorcinol, naphthol, catechol, hydroquinone, hexamethylenediamine, 3238 zxft 3262, sodium formate, sodium chloride, potassium propionate, sodium citrate, sodium chloride, potassium citrate, sodium chloride, potassium propionate and sodium chloride, potassium propionate which are used as a bactericide in ultrahigh-temperature stabilizer, sodium chloride, potassium propionate, sodium chloride, sodium propionate and sodium propionate which are used as a polymer (sodium chloride, potassium citrate, potassium propionate, sodium chloride, sodium propionate, sodium chloride, potassium propionate and sodium propionate which are used as a sodium chloride, sodium propionate polymer in ultrahigh temperature stabilizer 4 ) Potassium borohydride (KBH) 4 ) Sodium dithionite (Na) 2 S 2 O 4 ) Potassium dithionite (K) 2 S 2 O 4 ) Sodium bisulfite (NaHSO) 3 ) Potassium hydrogen sulfite (KHSO) 3 ) Sodium sulfite (Na) 2 SO 3 ) Potassium sulfite (K) 2 SO 3 ) Sodium sulfide (Na) 2 S), potassium sulfide (K) 2 S), 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:
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, and 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 nitrilotriacetateThe bactericide is at least one of malondialdehyde, succinaldehyde, glutaraldehyde, adipaldehyde, sodium trichlorophenolate, sodium bisulfide and potassium bisulfide, and the ultrahigh-temperature heat stabilizer is sodium borohydride (NaBH) 4 ) Potassium borohydride (KBH) 4 ) Sodium dithionite (Na) 2 S 2 O 4 ) Potassium dithionite (K) 2 S 2 O 4 ) Sodium bisulfite (NaHSO) 3 ) Potassium hydrogen sulfite (KHSO) 3 ) Sodium sulfite (Na) 2 SO 3 ) Potassium sulfite (K) 2 SO 3 ) Sodium sulfide (Na) 2 S), potassium sulfide (K) 2 S), 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
At normal temperature, slowly pouring 0.3-20 parts of thickening agent into 1000 parts of solvent in stirring, then continuously stirring until the thickening agent is completely dissolved to obtain polymer solution with tackifying performance, in the stirring process, adding 0.05-10 parts of ultra-high temperature polymer cross-linking agent and 0.5-100 parts of ultra-high temperature polymer stabilizing agent into the prepared thickening agent solution in sequence, then adding 0.1-10 parts of bactericide in the stirring process, continuously stirring uniformly, then continuously adding 0.1-10 parts of ultra-high temperature heat stabilizing agent, uniformly mixing, finally adding 0.5-4000 parts of density regulator to obtain the product with density of 1.01-2.50 g/cm 3 The 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, and the ultrahigh temperature polymer crosslinking agent is divinylbenzene, divinylbiphenyl, divinylnaphthalene, diethylenetriamine, hexamethylenediamine, 1,6-hexanediol, 1,5-pentanediol, and oligophenolAt least one of aldehyde 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 ethylene diamine tetraacetate, sodium formate, potassium formate, sodium acetate, potassium acetate, sodium propionate, potassium propionate, sodium 2-hydroxypropionate and trisodium nitrilotriacetate, the bactericide is at least one of malonaldehyde, succinaldehyde, glutaraldehyde, adipaldehyde, sodium trichlorophenolate, sodium bisulfide and potassium bisulfide, and the ultrahigh-temperature heat stabilizer is sodium borohydride (NaBH) 4 ) Potassium borohydride (KBH) 4 ) Sodium dithionite (Na) 2 S 2 O 4 ) Potassium dithionite (K) 2 S 2 O 4 ) Sodium bisulfite (NaHSO) 3 ) Potassium hydrogen sulfite (KHSO) 3 ) Sodium sulfite (Na) 2 SO 3 ) Potassium sulfite (K) 2 SO 3 ) Sodium sulfide (Na) 2 S), potassium sulfide (K) 2 S), 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.
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 of the solid-free workover fluid of the ultra-deep ultra-high temperature oil and gas well and the test temperature 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 16h. The viscosity of the ultra-deep ultra-high temperature oil and gas well solid-free workover fluid after being aged for 16 hours at the ultra-high temperature of 190 ℃ and 220 ℃ is higher than that before being aged, because at the ultra-high temperature, the thickening agent firstly generates a chemical crosslinking effect with the ultra-high temperature polymer crosslinking agent, the viscosity of the system is obviously increased, then the viscosity of the system is reduced along with the increase of the aging time, the aging temperature is higher, the reduction amplitude is larger, and the viscosity is still higher than that before being aged, 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 chemical reaction of the thickening agent and the crosslinking agent has good ultrahigh-temperature anti-aging performance and tackifying performance at ultrahigh temperature, and can resist high-concentration Fe in formation water 3+ 、Fe 2+ 、Ca 2+ And Mg 2+ And the like polyvalent metal cations.
(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 a low apparent viscosity at high shear rates in the wellbore and a low frictional drag, but a significantly increased apparent viscosity at lower annular shear rates, which is beneficial for sand washing 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 temperature of the ultra-deep ultra-high temperature oil and gas well solid-free workover fluid at the bottom of the well is 180-240 DEG CCan still show good thickening property, sand washing rock carrying property and filtration loss reduction property at the temperature of DEG C, and can resist high concentration Fe in formation water at ultrahigh temperature 3+ 、Fe 2+ 、Ca 2+ And Mg 2+ 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.
4. Detailed description of the preferred embodiments
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 ethylenediaminetetraacetic acid tetrasodium salt, 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 respectively in the stirring process, the stirring is continued to be uniform, 2 g of sodium sulfide and 3g of isopropanol are added continuously and mixed uniformly, and finally 5 g of sodium chloride is added for regulating the density of the workover fluid to obtain the density of 1.158g/cm 3 The 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 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. 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/cm 3 The 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 prepared thickener solution during the stirring processFirstly, 0.3 g of divinylbenzene, 0.5 g of hydroquinone and 0.5 g of hexamethylenetetramine, then 10 g of sodium hexametaphosphate, 6g of trisodium citrate and 20 g of potassium formate are added, then 1 g of succinaldehyde and 4g of sodium carbamate are respectively added in the stirring process, the stirring is continued to be uniform, then 3g of sodium hydrosulfite and 3g of orthoxylenesulfenthiuron are continuously added and mixed to be uniform, and finally 200 g of sodium chloride and 800 g of calcium bromide are added for adjusting the density of the workover fluid to obtain the density of 1.687g/cm 3 The 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 into the thickener solution respectively in the stirring process, the mixture is stirred continuously and uniformly, then 2 g of sodium sulfite and 6g of o-xylyl thiourea are added continuously and uniformly mixed, and finally 200 g of sodium chloride and 200 g of calcium bromide are added to adjust the density of the workover fluid to obtain the density of 1.307g/cm 3 The 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 slowly poured into 1000 g of stirred formation water containing 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 complete dissolution. 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, 0.5 g of thiourea and 1 g of sodium borohydride are continuously added into the mixture, the mixture is uniformly mixed, and 5 g of sodium chloride is added into the mixture to adjust the mixtureThe density of the workover fluid is 1.160g/cm 3 The solid-free workover fluid can be applied to ultra-deep ultra-high temperature oil and gas wells with the bottom temperature of 180-240 ℃.
5. Description of the attached tables
TABLE 1 test of the effect of temperature on apparent viscosity of a solid-free workover fluid before aging
Note: shear rate of 170.3s -1
TABLE 2 Effect of different aging temperatures on apparent viscosity of solid-free workover fluids
Note: and (3) testing temperature: shear rate 170.3s at 30 DEG C -1 And aging time: 16h
TABLE 3190 ℃ apparent viscosity and rheological parameters of the sample after aging for 16h
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.s n 。
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, 0.3-20 parts of thickening agent is slowly poured into 1000 parts of solvent in stirring at normal temperature, then the stirring is continued until the thickening agent is completely dissolved to obtain polymer solution with tackifying performance, 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 in the stirring process, 0.1-10 parts of bactericide is added in the stirring process, the stirring is continued to be uniform, then 0.1-10 parts of ultra-high temperature heat stabilizer are continuously added and uniformly mixed, and finally 0.5-4000 parts of density regulator is added to obtain the ultra-high temperature oil and gas well solid-free well repairing liquid with the density of 1.01-2.50 g/cm3 and the bottom temperature of 180-220 ℃;
the solvent is at least one of clear water and oil field formation water, the thickening agent is at least one of gellan gum, welan gum, scleroglucan and diutan, the ultrahigh-temperature polymer crosslinking agent is at least one of divinylbenzene, divinylbiphenyl, divinylnaphthalene, oligomeric phenolic resin and benzaldehyde, the ultrahigh-temperature polymer stabilizing agent is at least one of trisodium citrate, tetrasodium ethylenediaminetetraacetate, sodium formate, potassium formate, sodium acetate, potassium acetate, sodium propionate, potassium propionate, sodium 2-hydroxypropionate and trisodium nitrilotriacetate, the bactericide is at least one of malonaldehyde, succinaldehyde, glutaraldehyde, adipaldehyde, hexanedial, sodium trichlorophenolate, sodium disulfidate and potassium disulfamate, the ultrahigh-temperature heat stabilizer is at least one of sodium borohydride, potassium hydrosulfite, potassium dithionite, sodium bisulfite, potassium bisulfite, sodium sulfite, potassium sulfite, sodium sulfide, potassium sulfide, thiourea, orthoxylenesulfenthiuron, isopropanol, n-propanol, isobutanol, n-butanol, n-pentanol, isohexide and the density regulator is at least one of sodium chloride, calcium chloride and calcium bromide.
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| RU2711222C1 (en) * | 2018-11-15 | 2020-01-15 | Общество с ограниченной ответственностью Научно-производственное предприятие "БУРИНТЕХ" (ООО НПП "БУРИНТЕХ") | Heat-resistant biopolymer drilling mud |
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