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Oil field flooding stratum protective agent and preparation method and application thereof

A technology for formation protection and oilfield water injection, applied in chemical instruments and methods, earthwork drilling and production, cleaning equipment, etc., can solve the problems of scaling hazards, clogging formations, short validity period, etc., and improve the original permeability and formation permeability Effect

Inactive Publication Date: 2013-07-31
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 1. Serious scaling hazards occur in water injection, oil production, gathering and transportation, and water treatment systems, which affect normal production
[0004] 2. After the injection water with low salinity enters the reservoir, the clay minerals in the reservoir will expand, flake off, migrate, and block the pores of the reservoir
[0005] 3. The rock minerals in the reservoir are rich in iron-containing minerals, and the formation water contains a relatively high concentration of iron ions. On the one hand, when the foreign fluid has oxygen or a high pH value, it will form iron hydroxide and iron oxide to block the formation , on the other hand, iron ions lead to acid slag during acidification, and the performance of polymer oilfield chemicals decreases
The above methods have the disadvantages of strong pertinence, heavy workload, short validity period, and large types and dosages of medicaments.

Method used

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  • Oil field flooding stratum protective agent and preparation method and application thereof
  • Oil field flooding stratum protective agent and preparation method and application thereof
  • Oil field flooding stratum protective agent and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] First add 50 kg of deionized water into the 1-square reactor, first add 30 kg of nonylphenol polyoxyethylene ether at a flow rate of 5-10 liters / min and a stirring speed of 50-100 rpm, and then add 50-100 rpm Stir and dissolve under the stirring speed of 1 minute completely; Then add 450 kilograms of polyacrylic acid with effective content of 45% and molecular weight of 700-1000 by 5-10 liters / minute flow velocity and 50-100 rev / minute stirring speed; Stir and dissolve completely; press 5 Add 450 kg of hydroxyphosphonoacetic acid with an effective content of 45% in weight at 10 liters / minute flow rate and 50-100 rpm stirring speed; stir and dissolve completely, stir at 5-10 liters / min flow rate and 50-100 rpm stirring speed Add weight 20 kg deionized water under speed. The product is obtained after stirring evenly and fully dissolving at a stirring speed of 50-100 rev / min.

[0045] The composition is used for slug injection or fracturing of oil and water wells in oil f...

Embodiment 2

[0050] First add 50 kg of deionized water into the 1-square reaction kettle, first add 50 kg of octylphenol polyoxyethylene ether at a flow rate of 5-10 liters / min and a stirring speed of 50-100 rpm Stir and dissolve completely under the stirring speed of / min; then add 450 kg of hydrolyzed polymaleic acid with an effective content of 45% and a molecular weight of 400-800 at a flow rate of 5-10 liters / min and a stirring speed of 50-100 rev / min, and stir and dissolve Complete; add 450 kg of phosphinobutane tricarboxylic acid with an effective content of 45% by weight at a flow rate of 5-10 liters / min and a stirring speed of 50-100 rev / min; stir and dissolve completely, stir at 50-100 rev / min The product is obtained after stirring evenly and fully dissolving at the speed.

[0051] The composition is used for slug squeezing or fracturing and post-acidizing squeezing before oil and water wells are put into production. The dosage of a single well is 1-2 tons, and the concentration...

Embodiment 3

[0056] First add 50 kg of deionized water to the 1-square reaction kettle, first add 30 kg of octylphenol polyoxyethylene ether at a flow rate of 5-10 liters / min and a stirring speed of 50-100 rpm Stir and dissolve completely under the stirring speed of / min; then add under the flow rate of 5-10 liters / min and the stirring speed of 50-100 rev / min, add 400 kilograms of hydrolyzed polymaleic acid having an effective content of 50% and a molecular weight of 400-800, Stir and dissolve completely; add 400 kg of hydroxyphosphonoacetic acid with an effective content of 50% by weight at a flow rate of 5-10 liters / min and a stirring speed of 50-100 rev / min; stir and dissolve completely, press 5-10 liters / min flow rate and 50 - Add weight of 120 kg of deionized water at a stirring speed of 100 rpm. The product is obtained after stirring evenly and fully dissolving at a stirring speed of 50-100 rpm.

[0057] The composition is used for slug squeezing or fracturing and post-acidizing squ...

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Abstract

The invention relates to an oil field flooding stratum protective agent and a preparation method and application of the oil field flooding stratum protective agent. The oil field flooding stratum protective agent comprises the following components: 20%-22.5% of polycarboxylic acid, 20%-22.5% of organic phosphoric acid, 3%-5% of nonionic surfactant, and the balance being water. The polycarboxylic acid is selected from polyacrylic acid or hydrolysis polymaleic acid, the organic phosphoric acid is selected from phosphorus base butane tricarboxylic acid or hydroxyl phosphono acetic acid, the nonionic surfactant is alkylphenol polyoxyethylene ether, and the percentage is weight percentage. The oil field flooding stratum protective agent and the preparation method and the application of the oil field flooding stratum protective agent have good application prospect for economic and effective development of a clastic rock oil reservoir, and especially a low permeability reservoir.

Description

technical field [0001] The invention relates to an oilfield water injection formation protection agent, a preparation method and application thereof. Background technique [0002] During oilfield development, due to poor compatibility between injected water and formation water and between formation water and formation water, formation water itself is unstable, injected water is not compatible with reservoir rock, and formation water is rich in iron ions. During oilfield production and operation, The following reservoir damage is bound to occur: [0003] 1. Severe scaling hazards occur in water injection, oil production, gathering and transportation, and water treatment systems, affecting normal production. [0004] 2. After the injection water with low salinity enters the reservoir, it will cause the clay minerals in the reservoir to expand, flake off, migrate, and block the pores of the reservoir. [0005] 3. The rock minerals in the reservoir are rich in iron-containing ...

Claims

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Application Information

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IPC IPC(8): C09K8/528E21B37/06
Inventor 高春宁屈雪峰王东旭王小琳韩翼云韩亚萍丁雅勤谢珍胡志杰
Owner PETROCHINA CO LTD
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