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An underground foam rubber profile control agent

A technology of foamed rubber and profile control agent, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of water plugging system stability, shear strength, thermal stability, pharmaceutical cost, etc. No flammable and explosive sources, strong blocking ability, simple and safe production

Active Publication Date: 2019-07-12
DAGANG OIL FIELD GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In view of this, the present invention aims to propose an underground foam rubber profile control agent to solve the problem of deep water plugging in large-pore formations in oil exploitation, and the existing profile control agents in terms of system stability, shear strength, and thermal stability. , Problems in drug cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Raw materials (both commercially available industrial products): 30 kg of SEBS thermoplastic rubber, 10 kg of ammonium chloride, 10 kg of sodium nitrite, and 50 kg of ethylene glycol. Strictly follow the preparation method described above and control the extrudate size to 5mm to obtain a 4.5-5.5mm underground foam rubber profile control agent, which is stored in pure ethylene glycol solution.

[0036] Indoor large pore plugging simulation test: prepare for a permeability of 20 μm 2 sand filling pipe. Prepare a partially hydrolyzed polyacrylamide aqueous solution with a mass fraction of 3‰, add 2% underground foam rubber profile control agent, and mix evenly. Use a horizontal flow pump to inject the mixed solution at a speed of 10ml / min, the injection volume is 0.8PV, and the injection permeability is 20μm 2 sand filling pipe. The plugging rate of the sand filling pipe is 92% after testing the sand filling pipe at 70°C for 120 days.

[0037] Under the same test condi...

Embodiment 2

[0039] Raw materials (both commercially available industrial products): 40 kg of SEBS thermoplastic rubber, 15 kg of ammonium chloride, 15 kg of sodium nitrite, and 30 kg of ethylene glycol. Strictly follow the preparation method described above and control the extrudate size to 3mm to obtain a 2.5-3.5mm underground foam rubber profile control agent, which is stored in pure ethylene glycol solution.

[0040] Indoor large pore plugging simulation test: prepare for a permeability of 10 μm 2 sand filling pipe. Prepare a partially hydrolyzed polyacrylamide aqueous solution with a mass fraction of 3‰, add 1% underground foam rubber profile control agent, and mix evenly. Use a vertical flow pump to inject the mixed solution at a speed of 10ml / min, the injection volume is 0.8PV, and the injection permeability is 10μm 2 sand filling pipe. Put the sand-packed pipe at 90°C for 120 days to test that the plugging rate of the sand-filled pipe is 95%.

[0041] Under the same test condit...

Embodiment 3

[0043]Raw materials (both commercially available industrial products): 50 kg of SEBS thermoplastic rubber, 5 kg of ammonium chloride, 5 kg of sodium nitrite, and 40 kg of ethylene glycol. Strictly follow the preparation method described above and control the extrudate size to 1mm to obtain a 0.5-1.5mm underground foam rubber profile control agent, which is stored in pure ethylene glycol solution.

[0044] Indoor large pore plugging simulation test: prepare for a permeability of 1 μm 2 sand filling pipe. Configure an aqueous solution of partially hydrolyzed polyacrylamide with a mass fraction of 3‰, add 5‰ underground foam rubber profile control agent, and mix evenly. Use a vertical flow pump to inject the mixed solution at a speed of 10ml / min, the injection volume is 0.8PV, and the injection permeability is 1μm 2 sand filling pipe. The plugging rate of the sand filling pipe is 98% after testing the sand filling pipe at 90°C for 120 days.

[0045] Under the same test condit...

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Abstract

The invention provides a profile control agent for underground foamed rubber, comprising a profile control agent main body and a profile control agent auxiliary body, wherein the profile control agent main body comprises 30-50 parts by weight of SEBS thermoplastic rubber, 10-30 parts by weight of foaming agent and 30-50 parts by weight of glycol; the profile control agent auxiliary body is a common polymer water solution, and the mixture of the profile control agent auxiliary body and the profile control agent main body is used for underground profile control and water shut off, wherein the addition proportion of the profile control agent main body accounts for 0.5%-2% of the total mass of the profile control agent auxiliary body. Compared with the prior art, the profile control agent provided by the invention has the following advantages: soft rubber with high elasticity is adopted and can avoid blockage of a valve of a profile control pump and also can migrate smoothly in ground pores; the profile control agent has stable individual physical properties, is convenient for storage and can realize selective water shut off of an oil and water layer; and the profile control agent has strong shut off capacity and is better than general water solution gel, SMG polymer microspheres and pre-cross-linked water swelling polymer when used for profile control and water shut off under complications such as an oversize pore path.

Description

technical field [0001] The invention belongs to the technical field of water plugging and profile control for oil and water wells in oil exploitation, especially deep profile control and water plugging in large pore formations, and specifically relates to an underground foam rubber profile control agent. Background technique [0002] At present, most oilfields in my country are in the middle and late stages of development, especially after a long period of water flooding or polymer flooding, large pores that are much larger than the original pores of the formation have generally appeared in the exploited formation, resulting in subsequent water injection or polymer injection directly passing through the large pores Fleeing into the oil well, unable to effectively drive oil. At the same time, with the deepening of oil exploration and development, especially high-temperature and high-salt deep profile control, large-pore formations far away from profile control wells after mult...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/508C09K8/518
CPCC09K8/5083C09K8/518
Inventor 杨卫华葛红江雷齐玲程静徐佳妮雷齐松
Owner DAGANG OIL FIELD GRP
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