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

A technology of fluid loss control agent and emulsion, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of high polymer molecular weight, slow dissolution rate, inconvenient on-site use, etc., and achieve good fluid loss control effect , strong temperature resistance, good adsorption effect

Active Publication Date: 2014-04-02
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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 molecular weight of the synthetic polymer to be too high and the repeatability is poor
In addition, polymer fluid loss control agents also have problems such as slow dissolution rate when added and inconvenient use on site.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

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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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...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F220/58C08F226/10C08F226/02C09K8/035
Inventor 张坤王伟忠郭剑梅苏君李广环王磊磊马翠雪马运庆冯超张向明
Owner BC P INC CHINA NAT PETROLEUM CORP
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