AM (Acrylamide)/DMDAAC (Dimethyl Diallyl Ammonium Chloride)/cyclodextrin polymer filtrate reducer and preparation method thereof

A technology of cyclodextrin polymer and fluid loss reducer, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of increased water loss and instability of the well wall, and achieves mild reaction conditions and excellent water loss reduction. Filtration effect, the effect of simple and feasible preparation method

Inactive Publication Date: 2010-09-01
SOUTHWEST PETROLEUM UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide an AM / DMDAAC / cyclodextrin polymer fluid loss reducer and its preparation method in order to solve the problem of greatly increasing the water loss at the bottom of the oil and gas well under high temperature conditions, resulting in the instability of the well wall

Method used

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  • AM (Acrylamide)/DMDAAC (Dimethyl Diallyl Ammonium Chloride)/cyclodextrin polymer filtrate reducer and preparation method thereof
  • AM (Acrylamide)/DMDAAC (Dimethyl Diallyl Ammonium Chloride)/cyclodextrin polymer filtrate reducer and preparation method thereof
  • AM (Acrylamide)/DMDAAC (Dimethyl Diallyl Ammonium Chloride)/cyclodextrin polymer filtrate reducer and preparation method thereof

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example 1A

[0013] The preparation method of example 1AM / DMDAAC / cyclodextrin polymer fluid loss reducer

[0014] Add 50 mL of the prepared aqueous solution of 0.01 g / mL allyl cyclodextrin into a 150 mL beaker, then add 7 mL of the aqueous solution of 0.5 g / mL acrylamide (AM) and 0.5 g / mL of dimethyl dimethicone Allyl ammonium chloride (DMDAAC) aqueous solution 3mL. Then add 1 mL of disodium ethylenediaminetetraacetic acid (EDTA) chelating agent with a concentration of 0.5 g / mL, 1 mL of potassium persulfate oxidant with a concentration of 0.5 g / mL and sodium bisulfite reducing agent with a concentration of 0.5 g / mL. mL. Fully stir and mix evenly on a magnetic stirrer, then fill with nitrogen for 40 minutes to remove oxygen, and react at 45°C for 7 hours to obtain a transparent colloidal AM / DMDAAC / cyclodextrin polymer.

[0015] Measure the intrinsic viscosity of AM / DMDAAC / cyclodextrin polymer according to the standard described in GB12005.1-89, and then measure the molecular weight of the...

example 2A

[0016] The fluid loss effect of example 2AM / DMDAAC / cyclodextrin polymer

[0017] In order to evaluate the fluid loss reduction effect of AM / DMDAAC / cyclodextrin polymer at higher temperature, the base slurry was prepared according to the national standard GB / T16783-1997. That is, add 0.6g of anhydrous sodium carbonate, 12g of bentonite and 9g of evaluation soil to 300mL of ion-free water stirred at high speed, continue to stir for 30 minutes, and then keep it sealed for 24 hours to obtain a freshwater base slurry. Similarly, add 0.9g of anhydrous sodium carbonate, 18g of bentonite, 30g of evaluative clay and 90g of sodium chloride into 300mL of deionized water stirred at high speed, continue to stir for 30min, and then keep it sealed for 24h to obtain a saturated saline base slurry.

[0018] Table 1 shows the fluid loss control effect of AM / DMDAAC / cyclodextrin polymer. It can be seen from Table 1 that the polymer of the present invention has good temperature resistance, salt r...

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Abstract

The invention relates to an AM (Acrylamide)/DMDAAC (Dimethyl Diallyl Ammonium Chloride)/cyclodextrin polymer filtrate reducer used in petroleum and gas drilling fluid and a preparation method thereof. The invention can solve the technical problems that a well wall is not stable as water loss increases at the pit bottom under the condition of high temperature, and the like. The AM/DMDAAC/cyclodextrin polymer filtrate reducer is characterized by comprising three monomers of AM, DMDAAC and cyclodextrin; the preparation method comprises the following steps of: firstly adding the AM and the DMDAAC into an allyl cyclodextrin water solution according to the mol ratio among the allyl cyclodextrin water solution, the AM and the DMDAAC of 69.2-84.2:30-15:0.8 in sequence; then adding a chelating agent, an oxidant and a reducing agent in sequence; finally evenly mixing, then injecting nitrogen for 20-40min and deoxidizing, and reacting at 30-50 DEG C for 6-8h to obtain the AM/DMDAAC/cyclodextrin polymer filtrate reducer. The preparation method of the polymer is simple, convenient and available and mild in reaction conditions; and the polymer has good filtrate reduction effect in the drilling fluid, is resistant to temperature up to more than 250 DEG C and used in the petroleum and gas drilling fluid.

Description

technical field [0001] The invention relates to an AM / DMDAAC / cyclodextrin polymer fluid loss reducer used in drilling fluids in the petroleum and natural gas industry and a preparation method thereof. Background technique [0002] Reservoir damage during oil and gas well drilling is an important issue in the petroleum industry. In order to overcome the problem of oil layer damage during drilling, the petroleum industry uses various fluid loss control agents during drilling (Yan Siming, Liao Li, Long Xueli. Laboratory research on starch graft copolymer anti-temperature fluid loss control agent SALS, Oilfield Chemistry, 2009, 26(2) 118-120). However, when the drilling fluid is under high temperature conditions at the bottom of the hole, the performance of the fluid loss control agent is weakened. The invention provides a drilling fluid fluid loss reducer that can be used under high temperature conditions, and solves technical problems such as a large increase in water loss u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/035C08F220/56
Inventor 邹长军王猛雷英田强张菊
Owner SOUTHWEST PETROLEUM UNIV
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