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High-strength oil well plugging colloid and preparation method

A high-strength, oil-well technology, applied in the direction of chemical instruments and methods, drilling compositions, etc.

Active Publication Date: 2013-02-20
CHANGZHOU INST OF ENERGY STORAGE MATERIALS &DEVICES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is no report on the patent of this kind of high-strength plugging colloid

Method used

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  • High-strength oil well plugging colloid and preparation method
  • High-strength oil well plugging colloid and preparation method
  • High-strength oil well plugging colloid and preparation method

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Experimental program
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Embodiment 1

[0016] In the reaction vessel, carboxymethyl cellulose and acrylamide monomer are made into aqueous solution according to carboxymethyl cellulose: acrylamide: water (mass ratio) = 10: 20-200: 750, and the pH of the system is adjusted to be 7.0. N 2 Remove the oxygen in the system, add 0.5wt% (relative monomer mass) initiator (1wt% ammonium persulfate solution), and react at 50°C for 5h; the reaction product is diluted into an aqueous solution with a mass concentration of 0.5-2.5wt%, A gelling agent base liquid for preparing oil well plugging agent can be obtained. The apparent viscosity of the base fluid is measured using an RV-20 rotational viscometer at 170S at 25°C -1 completed at the shear rate. The results are listed in Table 1:

[0017] Table 1

[0018]

Embodiment 2

[0020] In the reaction vessel, 10g carboxymethyl hydroxyethyl cellulose, 150g N,N-dimethylacrylamide monomer and 1000g water were made into an aqueous solution, and the pH of the system was adjusted to 7.0, and filled with N 2 Remove the oxygen in the system, add 0.5wt% (relative to monomer mass) initiator (1wt% ammonium persulfate solution), and react at 50°C for 5h; the reaction product is diluted into an aqueous solution with a mass concentration of 2.0wt%, which can be obtained A gelling agent base fluid for preparing oil well plugging agent. The apparent viscosity of the base fluid is measured using an RV-20 rotational viscometer at 170S at 25°C -1 Completed under the shear rate, its apparent viscosity is 135mpa.s.

Embodiment 3

[0022] In the reaction vessel, make 10g carboxymethyl hydroxypropyl cellulose, 50g 2-acrylamide-2-methylpropanesulfonic acid monomer and 100g water to make an aqueous solution, adjust the pH of the system to 7.0, and fill with N 2 Remove the oxygen in the system, add 0.5wt% (relative to monomer mass) initiator (1wt% ammonium persulfate solution), and react at 50°C for 5h; the reaction product is diluted into an aqueous solution with a mass concentration of 2.0wt%, which can be obtained A gelling agent base fluid for preparing oil well plugging agent. The apparent viscosity of the base fluid is measured using an RV-20 rotational viscometer at 170S at 25°C -1 Completed under the shear rate, its apparent viscosity is 106mpa.s.

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Abstract

The invention relates to high-strength oil well plugging colloid and a preparation method. The high-strength oil well plugging colloid consists of cellulose derivatives and ethenyl hydrophilic monomer-containing graft copolymer which comprises the following components in percentage by weight based on the mass of the oil well plugging colloid: 0.5 to 2.5 percent of gelling agent, 0.02 to 0.5 percent of metal cross-linking agent, 0.01 to 0.2 percent of oxidizing gel breaker, 0.01 to 0.2 percent of oxidizing gel-breaking accelerator, 1 to 10 percent of bentonite and the balance of water. The invention provides high-strength oil well plugging colloid, which is characterized in that: the cross-linking time is controlled between 0.5 and 360 minutes; the oil well plugging colloid can be subjected gel breaking and disbonding at the temperature of between 30 and 120 DEG C for 2 to 240 hours; and the after-disbonding viscosity is less than 20 to 80 mpa.s.

Description

technical field [0001] The invention relates to a high-strength oil well plugging colloid and a preparation method thereof. Background technique [0002] In the modern oilfield industry, during oil and gas production or well workover and well completion operations, it is often necessary to use plugging agents to temporarily seal lost formations and prevent oil and gas blow-by. After the operation is completed, it can be automatically hydrated or unblocked by chemical methods, with little damage to the formation. [0003] In the prior art, "anti-high temperature well completion temporary plugging fluid" (CN1047686A) uses ethanol as a dispersant, safflower gum as a raw material, and cross-links titanium tetrachloride to obtain jelly. However, its jelly has poor temperature resistance and limited pressure bearing capacity, and the cost of titanium crosslinking agent is high, and the time of crosslinking and gel breaking is difficult to control. In addition, in the "liquid rub...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/467
Inventor 徐昆刘畅王丕新谭颖张文德李文波
Owner CHANGZHOU INST OF ENERGY STORAGE MATERIALS &DEVICES