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Granular volume expansion profile control agent for oil recovery and preparation

A granular, profile control agent technology, applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of difficult processing, high cost, short validity period, etc., and achieve long validity period, good toughness, and gel strength. high effect

Inactive Publication Date: 2011-09-14
张建军
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above technologies play a certain role in controlling high water content, there are common problems: high cost, difficult processing, and short validity period

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] A granular volume expansion profile control agent for oil recovery of the present invention is made of the following materials:

[0015] 30% bentonite aqueous solution 25~40g

[0016] 30% acrylamide aqueous solution 20~35g

[0017] 40% NaoH aqueous solution 3.0~6.0ml

[0018] Sodium persulfate 0.2~0.5g

[0019] Sodium sulfite 0.7~1.2g

[0020] Its preparation method is:

[0021] Prepare bentonite into a 30% aqueous solution and let it stand for 10 hours, then mix it with 30% acrylamide aqueous solution and stir evenly, then add sodium persulfate, sodium sulfite and 40% NaoH aqueous solution, mix well, stir evenly, and react at room temperature for 15 ~30 minutes, and then raised to 50°C and allowed to stand at a constant temperature for 3 hours, then dried, granulated, pulverized, and sieved to obtain a granular volume expansion profile control agent for oil recovery.

Embodiment 2

[0023] A granular volume expansion profile control agent for oil recovery of the present invention is made of the following materials:

[0024] 30% bentonite aqueous solution 25g

[0025] 30% acrylamide aqueous solution 20g

[0026] 40% NaoH aqueous solution 3.0ml

[0027] Sodium persulfate 0.2g

[0028] Sodium sulfite 0.7g

[0029] Its preparation method is:

[0030] Prepare bentonite into a 30% aqueous solution and let it stand for 10 hours for later use. Take 25g of 30% bentonite aqueous solution, mix and stir with 20g of 30% acrylamide aqueous solution, then add 0.2g of sodium persulfate, 0.7g of sodium sulfite and 3.0ml of 40 % NaoH aqueous solution is fully mixed, stirred evenly, reacted at room temperature for 15 to 30 minutes, then raised to 50°C and kept at a constant temperature for 3 hours, then dried, granulated, crushed, and sieved to obtain oil recovery granules Body swelling profile control agent.

Embodiment 3

[0032] A granular volume expansion profile control agent for oil recovery of the present invention is made of the following materials:

[0033] 30% bentonite aqueous solution 40g

[0034] 30% acrylamide aqueous solution 35g

[0035] 40% NaoH aqueous solution 6.0ml

[0036] Sodium persulfate 0.5g

[0037] Sodium sulfite 1.2g

[0038] Its preparation method is with embodiment 2.

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Abstract

The invention relates to a granular volume expansion profile control agent for oil recovery and a preparation, and the preparation comprises the following steps: uniformly mixing and stirring 25-40g of 30% bentonite water solution and 20-35g of 30% acrylamide water solution, further adding 0.2-0.5g of sodium sulfate, 0.7-1.2g of sodium sulfite and 3.0-6.0ml of 40% NaOH water solution, fully mixing, uniformly stirring, reacting for 15-30 minutes at room temperature, further rising temperature to 50 DEG C, standing for 3 hours at the constant temperature, and further performing drying, granulation, pulverization and screening, thereby preparing the granular volume expansion profile control agent for oil recovery. Polyacrylamide with low degree of hydrolysis is used as a raw material main agent, thereby having the characteristics of high gel strength, good toughness and effective expansion; and phenols and organic acid are selected as gel combination agents, thereby having the characteristics of stable gel combination, no gel breaking, no hydrolysis, salt resistance and biodegradation resistance. The granular volume expansion profile control agent for oil recovery adopts a formula system which combines the granular volume expansion profile control agent and a gel type profile control agent into a whole, thereby having the characteristics of having high volume expansion coefficient and long effective period, and being applicable to crack oil-bearing structures and pore oil-bearing structures.

Description

technical field [0001] The invention relates to a granular volume expansion profile control agent for oil recovery and its preparation. Background technique [0002] After decades of water flooding development, domestic onshore oil fields have serious heterogeneity and large differences in vertical and horizontal permeability. During the production process of the oil well, the water cut rises rapidly, and most of the oil layers are flooded prematurely. For heterogeneous multi-reservoir sandstone oilfields, parameters such as thickness, extension length and permeability of each reservoir group and reservoirs vary greatly in plane and vertical directions. With the prolongation of water flooding development time, the water absorption, oil production and water flooding conditions of various oil layers are more and more different, and some medium and low permeability layers have very slow oil production rate during the development process, or are basically undeveloped. Subdivid...

Claims

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Application Information

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IPC IPC(8): C09K8/42C09K8/58
Inventor 张建军
Owner 张建军
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