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Plugging control agent prepared by oil residues or oily sewage and preparation method thereof

The technology of plugging control agent and oil residue is applied in chemical instruments and methods, earthwork drilling, drilling composition and other directions, which can solve the problems of unfavorable transportation and storage, affecting construction connectivity, and unsatisfactory plugging effect, etc. Achieve the effect of adapting to a wide range of reservoir types, improving the plugging effect and low price

Active Publication Date: 2015-12-02
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the prepared plugging agent contains crude oil and water, it is not conducive to transportation and storage, and the gelling strength is weak, so it is not suitable for profile control of reservoirs with high permeability channels and large fractures
[0004] CN1278547A discloses a multifunctional plugging agent. The plugging agent is selected from oilfield oily sludge, waste mud, bentonite, calcium oxide, cement, polymer, lignin and facultative anaerobic microorganisms in different proportions. The polymers include polyacrylamide, xanthan gum and pre-crosslinked gel particles. Since the plugging agent is made of inorganic cement, bentonite, organic polymers, lignin, etc., it has poor compatibility in field application. It is easy to stratify and subside, block the profile control pump and well low, lead to frequent pump inspection, affect the construction connection, and cause operation hazards
CN1429692A discloses a composite solid particle plugging agent, which is composed of bentonite, acrylamide, ammonium salt initiator and water, but bentonite and acrylamide are prone to flocculation reaction, resulting in precipitation, and at the same time, it is resistant to temperature and salt Poor performance, resulting in unsatisfactory plugging effect
[0005] Because the existing oily sludge plugging control agent is prone to natural settlement in the liquid distribution tank, profile control pump or wellbore, and frequent pump inspection has a certain operational risk, which affects the success rate of construction. In addition, solid particles such as soil powder are easy to Flocculation with polymer

Method used

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  • Plugging control agent prepared by oil residues or oily sewage and preparation method thereof
  • Plugging control agent prepared by oil residues or oily sewage and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] This embodiment provides a plugging regulating agent made of oil residue. In terms of mass percentage, the raw materials for preparing the plugging regulating agent are:

[0030] Oil residue: 30%, the oil residue has a sand content ratio of 10%, an oil content ratio of 20%, and a particle size of silt and sand particles of 10-100 μm;

[0031] Monomer acrylamido-methylpropanesulfonic acid: 5%;

[0032] N,N-methylenebisacrylamide: 5%;

[0033] Sodium performaldehyde sulfoxylate-ammonium sulfate: 0.5%, the mass ratio of sodium performaldehyde sulfoxylate to ammonium sulfate is 3:1;

[0034] Sodium gluconate: 0.05%;

[0035] Thiourea; 0.02%;

[0036] Rubber powder: 0.5%;

[0037] remaining water.

[0038] The specific preparation process is:

[0039] (1) dissolving the monomer acrylamido-methyl propane sulfonic acid in clear water or oil field reinjection sewage to obtain a monomer solution;

[0040] (2) Add N,N-methylenebisacrylamide, sodium performaldehyde sulfoxyl...

Embodiment 2

[0044] This embodiment provides a plugging regulating agent made from oily sludge. In terms of mass percentage, the raw materials for preparing the plugging regulating agent are:

[0045] Oily sludge: 60%, the oily sludge has a sand content ratio of 20%, an oil content ratio of 40%, and a particle size of silt and sand particles of 10-100 μm;

[0046] Acrylamido-methylpropanesulfonic acid: 15%;

[0047] N,N-methylenebisacrylamide: 10%;

[0048] Sodium performaldehyde sulfoxylate-ammonium sulfate: 5%, the mass ratio of sodium performaldehyde sulfoxylate to ammonium sulfate is 3:1;

[0049] Sodium gluconate: 0.5%;

[0050] Thiourea; 0.1%;

[0051] Bark powder: 5%;

[0052] remaining water.

[0053]The above-mentioned raw materials are prepared according to the preparation method in Example 1 (the difference is: replace the oil residue in Example 1 with oily sludge, replace the rubber powder with bark powder, and provide the dosage of each component according to this example...

Embodiment 3

[0059] This embodiment provides a plugging regulating agent made from oily sludge. In terms of mass percentage, the raw materials for preparing the plugging regulating agent are:

[0060] Oily sludge: 40%. The oily sludge has a sand content ratio of 20%, an oil content ratio of 40%, and a particle size of silt and sand particles of 10-100 μm;

[0061] Acrylamido-methylpropanesulfonic acid: 9%;

[0062] N,N-methylenebisacrylamide: 6%;

[0063] Sodium performaldehyde sulfoxylate-ammonium sulfate: 3%, the mass ratio of sodium performaldehyde sulfoxylate to ammonium sulfate is 3:1;

[0064] Sodium gluconate: 0.2%;

[0065] Thiourea; 0.08%;

[0066] Rice bran: 2%;

[0067] remaining water.

[0068] The above raw materials were prepared according to the preparation method in Example 1 (the difference is: the oil residue in Example 1 was replaced with oily sludge, the rubber powder was replaced with rice bran, and the dosage of each component was provided according to the presen...

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Abstract

The invention provides a plugging control agent prepared by oil residues or oily sewage and a preparation method thereof. The plugging control agent comprises, by weight, 30-60% of oil residues or oily sewage, 5-15% of 2-acrylamido-2-methyl propane sulfonic acid, 5-10% of N,N-methylene-bisacrylamide, 0.5-5% of initiators, 0.05-0.5% of organic retarder, 0.02-0.1% of stabilizer, 0.5-5% of solid-phase particles and the balance of water. The plugging control agent prepared by the oil residues or oily sewage has the advantages that the preparation technology is simple, the raw materials are wide in source, the price is low, environmental friendliness is good, the compatibility between the plugging control agent and a stratum is good, flocculation is not likely to be generated, plugging strength is high, and temperature resistance and salt tolerance are good; the plugging control agent has a certain selective water-plugging function, can achieve deep water plugging and profile control, does not pollute the stratum and is suitable for many reservoir types.

Description

technical field [0001] The invention belongs to the field of profile control and water plugging of oil-water wells, and in particular relates to a plugging regulating agent made from oil residue or oily sludge and a preparation method thereof. Background technique [0002] Oil residue is the product of advanced treatment of oily sludge. Oily sludge refers to oil tanks, settling tanks, sewage tanks, bottom sludge of grease traps, oily water treatment facilities in refineries, light hydrocarbon processing plants, The oil sand and oil sludge removed by the natural gas purification device, the ground crude oil and oily sludge produced by drilling, operation, and pipeline perforation. When the oil storage tank is storing oil, a small amount of mechanical impurities, sand, soil, heavy metal salts, and heavy oily components such as paraffin and asphaltene in the oil deposit on the bottom of the oil tank to form sludge at the bottom of the tank. [0003] CN1480627A discloses a meth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/506E21B33/13
CPCC09K8/506C09K2208/04E21B33/13
Inventor 陈小凯刘德铸张洪君王浩郑猛李瑞柳荣伟朱伟张芸吴赞美马昌明刘强孙士馨石磊马威
Owner PETROCHINA CO LTD