High-temperature resistant polymer viscosity reducer for drilling fluid and preparation method thereof

A technology of high temperature resistance and polymer, which is applied in the direction of drilling compositions, chemical instruments and methods, etc. It can solve the physical and chemical effects of poor temperature resistance, viscosity reducer without temperature resistance, and affect the performance of drilling fluid system, etc. problem, to achieve high efficiency, good viscosity reduction effect, and viscosity reduction effect

Inactive Publication Date: 2009-09-16
CHINA UNIV OF PETROLEUM (EAST CHINA) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Their temperature resistance cannot meet the needs of ultra-deep well drilling, especially there is no viscosity reducer with a temperature resistance above 245°C
Therefore, the current measures to reduce the viscosity and shear force of ultra-high-temperature and high-density water-based drilling fluids are often to add a variety of viscosity-reducing agents in large quantities or to dilute with slurry base fluid, which results in poor temperature resistance in drilling fluids. Complex physical and chemical interactions occur between components under high temperature and high pressure conditions, affecting the performance and stability of the drilling fluid system or falling into a vicious cycle of dilution-aggravation-re-dilution-re-aggravation

Method used

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  • High-temperature resistant polymer viscosity reducer for drilling fluid and preparation method thereof
  • High-temperature resistant polymer viscosity reducer for drilling fluid and preparation method thereof
  • High-temperature resistant polymer viscosity reducer for drilling fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0021] Example 1: In a four-neck flask equipped with a stirrer, reflux condenser, thermometer and heating device, add 200mL of distilled water, add 12.3g of acrylic acid and 24.2g of 2-methyl-2-acrylamidopropanesulfonic acid while stirring , 11.3g of methyl acrylate and 11.5g of dimethyl diallyl ammonium chloride, adjust pH=7.0 with sodium hydroxide, heat to 60°C while stirring, add 2.0g of ammonium persulfate, and react for 20 minutes, Add 0.8 g of thioglycolic acid to terminate the reaction. The viscous liquid in the reaction kettle is dried and crushed through a 20-mesh sample sieve to obtain the high temperature resistant polymer viscosity reducer. In this polymer, m:n:x:y=10:8:7:4, the viscosity average molecular weight is about 6000, and the number of structural units is about 12.

example 2

[0022] Example 2: In a four-necked flask equipped with a stirrer, a reflux condenser, a thermometer and a heating device, add 200 mL of distilled water, and add 18.4 g of methacrylic acid and 2-methyl-2-acrylamidopropanesulfonic acid while stirring 24.2g, 12.2g of 2-hydroxyethyl acrylate and 10.8g of allyltrimethylammonium chloride, adjust pH=7.0 with sodium hydroxide, heat to 60°C while stirring, add 2.0g of ammonium persulfate , reacted for 20 minutes, and added 0.8 g of thioglycolic acid to terminate the reaction. The viscous liquid in the reaction kettle is dried and crushed through a 20-mesh sample sieve to obtain the high temperature resistant polymer viscosity reducer. In this polymer, a:b:c:d=10:7:5:4, the viscosity average molecular weight is about 5000, and the number of structural units is about 9.

example 3

[0023] Example 3: Evaluation of temperature resistance and viscosity reduction effect

[0024] Test method: adopt GB / T16783-1997: Field test procedure for water-based drilling fluid.

[0025] 1. Tested in fresh water base slurry

[0026] Preparation of base slurry: Add 400mL tap water into a high stirring cup, add 1.6g of anhydrous sodium carbonate, 32g of secondary bentonite and 40g of evaluation soil under constant stirring, stir for 20 minutes, seal and let stand for 24 hours to prepare the base slurry.

[0027] Experimental pulp preparation and testing: Add 0.2% of evaluation samples (Descofl, Example 1 sample, Example 2 sample) to the prehydrated base pulp respectively, stir evenly at high speed, and measure the rheological parameters. Put the experimental slurry into a high-temperature aging tank, roll it at 245°C for 16 hours, take it out and measure its rheological parameters in the same way.

[0028] Table 1 Test results in freshwater base slurry

[0029]

[003...

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Abstract

The invention discloses a high-temperature resistant polymer viscosity reducer for drilling fluid and a preparation method thereof. The polymer viscosity reducer is a copolymer generated by olefine acid, olefine sulfoacid, olefine acid ester and alkenyl quaternary ammonium through chemical reaction, molecules of the copolymer contain 5 to 60 structural units, and viscosity average molecular weight is 2,500 to 30,000. The polymer viscosity reducer can resist temperature of more than 245 DEG C in the drilling liquid, and effectively disperse a grid structure of the drilling liquid, has good viscosity reduction effect in fresh water, aggravated fresh water and a calcium chloride and sodium chloride composite saline water drilling fluid, and can simultaneously inhibit hydration and swelling of clay and reduce filtration loss.

Description

Technical field: [0001] The invention belongs to a viscosity reducer for petroleum drilling fluid. technical background: [0002] In the drilling of deep and ultra-deep wells, due to complex formations, downhole high temperature and high pressure, and long operation periods, higher requirements are put forward for ultra-deep well drilling fluid technology, and many technical difficulties are still faced. Rheological regulation is one of them, especially for ultra-high temperature and high density water-based drilling fluids. Excessive drilling fluid viscosity and shear force will cause a series of complex situations such as reduction of ROP, pipe sticking, blowout, well collapse and logging resistance, and even lead to the scrapping of the wellbore, and also cause damage to the oil layer, resulting in major economic loss. [0003] At present, the existing domestic viscosity reducers for drilling fluids include iron chromium lignosulfonate, tannin, zwitterionic polymers, or...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/035C08F220/06C08F220/56C08F220/14C08F236/20C08F220/20C08F2/38
Inventor 邱正松黄维安薛玉志李公让徐加放乔军刘宝锋江琳于连香
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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