Temperature-resistant and salt-resistant fluid loss additive emulsion and preparation method thereof

Abstract

The invention discloses a temperature-resistant and salt-resistant fluid loss additive emulsion which is prepared by four simple substances, namely acrylamide, N-vinyl pyrrolidone, dimethyl diallyl ammonium chloride and 2-methyl-2-acrylamide propanesulfonic acid, water, white oil, an emulsifier and an initiator. The invention further discloses a preparation method of the temperature-resistant and salt-resistant fluid loss additive emulsion. The temperature-resistant and salt-resistant fluid loss additive emulsion can resist temperature up to 220 DEG C and can resist salt to saturation; the emulsion contains an amide group, a sulfonic group, an amine group, cation ammonium and a six-membered ring, so that a polymer has very high temperature resistance; strong adsorption groups of the polymer can ensure that the polymer has a good adsorption effect to clay under the high temperature condition, and can ensure that the fluid loss additive emulsion has a better fluid loss effect at a high temperature; and in addition, the emulsion is good in repeatability and high in solution rate, and can be directly applied to a site.

Description

technical field

[0001] The invention relates to the field of oil and gas drilling, in particular to a temperature-resistant and salt-resistant fluid loss reducer emulsion and a preparation method thereof. Background technique

[0002] With the increase in the number of deep wells and ultra-deep wells, higher and higher requirements are placed on the performance of drilling fluids for temperature and salt resistance. The increase of bottomhole temperature will lead to the deterioration of drilling fluid rheology and fluid loss control performance, which will easily lead to complex bottomhole accidents. At present, the anti-high temperature fluid loss additives used in China are mainly polymers. Although polymer fluid loss additives can improve the fluid loss performance of drilling fluids at high temperatures, polymer fluid loss additives are still difficult to synthesize Because the polymerization process is not easy to control during the process, it is easy to cause the mo...

Examples

Embodiment 1

[0026] 1) Dissolve 38g AM, 9g NVP, 5g DMDAAC, and 15g AMPS in 110mL water, adjust to pH=12 with NaOH, and obtain an aqueous solution;

[0027] 2) Add 110mL of white oil and 10g of sorbitan oleate into a three-necked flask, stir for 10min under nitrogen at room temperature, then add the above aqueous solution, then raise the temperature to 50°C, add 0.5g of azobisisobutyronitrile, react for 8h, and prepare Obtain temperature-resistant and salt-resistant fluid loss reducer emulsion.

Embodiment 2

[0029] 1) Dissolve 25g AM, 3g NVP, 1g DMDAAC, 6g AMPS in 115mL water, adjust to pH=9 with NaOH, and obtain an aqueous solution;

[0030] 2) Add 200 mL of white oil and 6 g of glycerol monooleate into the three-necked bottle, stir at room temperature with nitrogen for 15 minutes, and then add the above aqueous solution;

[0031] 3) Raise the temperature to 40°C, add 0.5 g of ammonium persulfate, and react for 2 hours to prepare a temperature-resistant and salt-resistant fluid loss reducer emulsion.

Embodiment 3

[0033] 1) Dissolve 30g AM, 7g NVP, 3g MDAAC, 10g AMPS in 70mL water, adjust to pH=11 with NaOH, and obtain an aqueous solution;

[0034] 2) Add 100 mL of white oil, 6 g of glycerol monostearate, and 6 g of polyoxyethylene monopalmitate into a three-necked bottle, stir at room temperature with nitrogen for 20 minutes, and then add the above aqueous solution;

[0035] 3) Raise the temperature to 45°C, add 0.5 g of dibenzoyl peroxide, and react for 4 hours to prepare a temperature-resistant and salt-resistant fluid loss reducer emulsion.

[0036] 3. Evaluation of temperature resistance and fluid loss effect of fluid loss reducer emulsion for temperature and salt resistance

[0037] Prepare saturated brine base slurry: put 350ml of saturated brine in a tall stirring cup, add 1.00g of NaHCO3 and 35.00g of evaluation soil, stir for 20min, and stop at least twice to scrape the wall.

technical field

[0001] The invention relates to the field of oil and gas drilling, in particular to a temperature-resistant and salt-resistant fluid loss reducer emulsion and a preparation method thereof. Background technique

[0002] With the increase in the number of deep wells and ultra-deep wells, higher and higher requirements are placed on the performance of drilling fluids for temperature and salt resistance. The increase of bottomhole temperature will lead to the deterioration of drilling fluid rheology and fluid loss control performance, which will easily lead to complex bottomhole accidents. At present, the anti-high temperature fluid loss additives used in China are mainly polymers. Although polymer fluid loss additives can improve the fluid loss performance of drilling fluids at high temperatures, polymer fluid loss additives are still difficult to synthesize Because the polymerization process is not easy to control during the process, it is easy to cause the mo...

Examples

Embodiment 1

[0026] 1) Dissolve 38g AM, 9g NVP, 5g DMDAAC, and 15g AMPS in 110mL water, adjust to pH=12 with NaOH, and obtain an aqueous solution;

[0027] 2) Add 110mL of white oil and 10g of sorbitan oleate into a three-necked flask, stir for 10min under nitrogen at room temperature, then add the above aqueous solution, then raise the temperature to 50°C, add 0.5g of azobisisobutyronitrile, react for 8h, and prepare Obtain temperature-resistant and salt-resistant fluid loss reducer emulsion.

Embodiment 2

[0029] 1) Dissolve 25g AM, 3g NVP, 1g DMDAAC, 6g AMPS in 115mL water, adjust to pH=9 with NaOH, and obtain an aqueous solution;

[0030] 2) Add 200 mL of white oil and 6 g of glycerol monooleate into the three-necked bottle, stir at room temperature with nitrogen for 15 minutes, and then add the above aqueous solution;

[0031] 3) Raise the temperature to 40°C, add 0.5 g of ammonium persulfate, and react for 2 hours to prepare a temperature-resistant and salt-resistant fluid loss reducer emulsion.

Embodiment 3

[0033] 1) Dissolve 30g AM, 7g NVP, 3g MDAAC, 10g AMPS in 70mL water, adjust to pH=11 with NaOH, and obtain an aqueous solution;

[0034] 2) Add 100 mL of white oil, 6 g of glycerol monostearate, and 6 g of polyoxyethylene monopalmitate into a three-necked bottle, stir at room temperature with nitrogen for 20 minutes, and then add the above aqueous solution;

[0035] 3) Raise the temperature to 45°C, add 0.5 g of dibenzoyl peroxide, and react for 4 hours to prepare a temperature-resistant and salt-resistant fluid loss reducer emulsion.

[0036] 3. Evaluation of temperature resistance and fluid loss effect of fluid loss reducer emulsion for temperature and salt resistance

[0037] Prepare saturated brine base slurry: put 350ml of saturated brine in a tall stirring cup, add 1.00g of NaHCO3 and 35.00g of evaluation soil, stir for 20min, and stop at least twice to scrape the wall.

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