CN107629775B - Oil-containing sludge profile control agent and preparation method thereof - Google Patents
Oil-containing sludge profile control agent and preparation method thereof Download PDFInfo
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- CN107629775B CN107629775B CN201710719328.2A CN201710719328A CN107629775B CN 107629775 B CN107629775 B CN 107629775B CN 201710719328 A CN201710719328 A CN 201710719328A CN 107629775 B CN107629775 B CN 107629775B
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Abstract
The invention discloses a sludge profile control agent and a preparation method thereof, and the sludge profile control agent comprises 0.1-0.5% of thickening agent, 0.01-0.2% of cross-linking agent, oil-containing sludge and water. Surfactant groups are introduced into the molecules of the thickening agent, so that the thickening agent can effectively suspend and disperse oil sludge, and the cross-linking agent is a hydroxymethyl amine solution. The preparation method comprises the steps of uniformly mixing clear water and oily sludge according to a proportion, adding the cross-linking agent, uniformly stirring, adding the thickening agent, continuously stirring to obtain the sludge profile control agent with good injection performance, controlling gelling time, having strong plugging capability and salt resistance, and realizing deep profile control.
Description
Technical Field
The invention relates to the technical field of profile control agents for oil fields, in particular to an oil-containing sludge profile control agent and a preparation method thereof, and the profile control agent is a deep oil-containing sludge profile control agent with controllable gelling time.
Background
In the process of oil field development, oil-containing sludge is generated by an oil-water separation system, a sewage treatment system and a storage and transportation system, and a large amount of oil-containing sludge seriously affects the field production environment and increases the production cost. Therefore, how to realize the economical and effective harmless treatment of the oily sludge is an urgent problem to be solved in the production process of the oil field while the production is developed. Because the oily sludge is produced in a stratum and has good compatibility with an oil layer, and solid-phase particles in the oily sludge have a profile control effect, the oily sludge can be used as a basic raw material and is correspondingly treated by a chemical method to prepare an oily sludge profile control system, the strength of plugging a hypertonic pore by using a plugging agent can be increased, the plugging validity period is prolonged, and the problem of treatment of the oily sludge is solved.
In the process of sludge profile control and water shutoff, because the oily sludge contains a large amount of oil, silt and inorganic salt, the thickening agent can not completely and effectively disperse the suspended oily sludge, and layering is easily caused, so that the prepared profile control gel has the problems of substandard performance, water separation and separation, no temperature and scouring resistance in the stratum, short water shutoff validity period and the like.
Disclosure of Invention
The invention aims to overcome the problems of the prior art and provides an oily sludge profile control agent and a preparation method thereof, and the prepared oily sludge profile control agent has good temperature resistance and anti-scouring performance.
In order to achieve the purpose, the invention adopts the following technical scheme
An oily sludge profile control agent comprises the following components in percentage by mass:
thickening agent: 0.1 to 0.5 percent;
a crosslinking agent: 0.01 to 0.5 percent;
oily sludge: 5 to 50 percent;
the balance of water;
the thickening agent is characterized in that a surfactant group is introduced into a molecule of the thickening agent, and the structural formula of the thickening agent is as follows:
wherein m is 20-30, n is 60-80, x is 1-10, y is 0.1-5, and the hydrophobic group R in the surfactant group is a C8-C18 mixed carbon chain;
the cross-linking agent is methylol amine solution.
The viscosity average molecular weight of the thickening agent is 1500 multiplied by 104-2000×104g/mol; the average molecular weight of the hydrophobic radical R is 182 g/mol.
The thickener is prepared by the following steps:
according to mole percentage, 20-30% of acrylic acid, (60-80)% of acrylamide, (1-10)% of 2-acrylamide-2-methylpropanesulfonic acid and (0.1-5)% of surfactant functional monomer are dissolved by water, all the reaction monomers account for 30-35% of the total solution by mass, then an alkali solution is used for neutralization, the neutralization temperature is controlled to be less than 20 ℃ by an ice water bath, nitrogen is introduced for deoxidization, and the thickening agent is obtained by initiating polymerization, granulation, drying and crushing by an initiator.
The initiator is a composite initiation system consisting of ammonium persulfate, a sodium formaldehyde sulfoxylate and azo V044: ammonium persulfate (the mass fraction is 50-45%), sodium formaldehyde sulfoxylate (the mass fraction is 25-20%), azoV 044 (the mass fraction is 25-35%), and the addition amount of the initiator is 0.002-0.5% of the mass of the reaction monomer.
The structural formula of the cross-linking agent is as follows:
wherein R is2Comprises the following steps:
when the crosslinking agent is JL-POA; r2Comprises the following steps: -CH2CH2CH2CH2CH2CH2When-is, the crosslinking agent is JL-CA.
A preparation method of an oily sludge profile control agent comprises the following steps:
according to mole percentage, 20-30% of acrylic acid, (60-80)% of acrylamide, (1-10)% of 2-acrylamide-2-methylpropanesulfonic acid and (0.1-5)% of surfactant functional monomer are dissolved by water, all reaction monomers account for 30-35% of the total solution by mass, the solution is neutralized by alkali solution, the neutralization temperature is controlled to be less than 20 ℃ by ice water bath, nitrogen is introduced for deoxidization, polymerization, granulation, drying and crushing are initiated by an initiator to obtain a thickening agent, and the addition amount of the initiator is 0.002-0.5% of the reaction monomers by mass.
And uniformly mixing clear water and the oily sludge according to a ratio, sequentially adding the cross-linking agent and the thickening agent, and uniformly stirring to obtain the oily sludge profile control agent.
As a further improvement of the invention, the initiator is a composite initiation system consisting of ammonium persulfate, a pendant white block and azo V044, wherein the mass fraction of the ammonium persulfate is 50-45%, the mass fraction of the pendant white block is 25-20%, and the mass fraction of the azo V044 is 25-35%.
Compared with the prior art, the invention has the following advantages:
the sludge profile control agent disclosed by the invention consists of a thickening agent, a cross-linking agent, oily sludge and water, wherein the profile control agent is prepared from the thickening agent with a surfactant structure and the cross-linking agent with multiple functional groups, the thickening agent can effectively suspend and disperse oil sludge, the cross-linking agent is a methylol amine solution, the effective content of the methylol amine solution is 40%, the methylol amine solution has multiple active functional groups, the cross-linking density is increased, and the strength of the profile control agent is improved. The oily sludge is effectively suspended on the ground, the gelling time is controllable, and the gelled sludge has good temperature resistance and anti-scouring performance.
Furthermore, the initiator is a composite initiation system consisting of ammonium persulfate, a sodium formaldehyde sulfoxylate and water-soluble azo V044, the initiation reaction effect is obvious, and the reaction is quicker and more sufficient.
The preparation method of the sludge profile control agent comprises the steps of uniformly mixing clear water and oily sludge according to a proportion, sequentially adding the cross-linking agent and the thickening agent, and uniformly stirring to obtain the sludge profile control agent with good injection performance.
Detailed Description
The physical property indexes of the oily sludge adopted in the examples are shown in the following table 1:
TABLE 1
| Item | Measured in fact |
| Appearance of the product | Dark brown viscous liquid |
| pH value | 7.1 |
| Density (g/cm)3) | 1.12 |
| Water content (%) | 72.15 |
| Containing mud (%) | 19.44 |
| Oil content (%) | 8.41 |
| Apparent viscosity (mPa. s) | 197 |
Example 1
Dissolving acrylamide, acrylic acid, 2-acrylamide-2-methylpropanesulfonic acid and a surface active functional monomer by using water, neutralizing by using a 30% sodium hydroxide solution, controlling the neutralization temperature to be less than 20 ℃ in an ice-water bath, controlling the mass of the monomer to be 30-35%, introducing nitrogen to remove oxygen for 30min, and initiating polymerization, granulation, drying and crushing by using a composite initiation system consisting of ammonium persulfate, a rongalite and water-soluble azo V044 to obtain the product. The specific mixture ratio is shown in table 2:
TABLE 2
Example 2
At 5m3Is added into a stirring tank with the diameter of 3.0m3The clear water is stirred and added into the mixture for 2.0m3Adding 5.0Kg of cross-linking agent JL-POA and 10.0Kg of thickening agent A into the oily sludge to obtain the profile control agent.
Examples 3 to 7
Different profile control agents were prepared according to the charge formulation of example 2, with the compositions shown in table 3.
TABLE 3
Example 8
The oily sludge gels of examples 2-7 were cured at 50 ℃, the time at which the oily sludge profile control agent lost flow properties was recorded as the gel formation time, and the gel strength was measured at different time periods of curing for 30 days, see table 4.
TABLE 4
Example 9
Selecting artificial rock cores with different permeability, injecting 1PV oily sludge, and curing at 50 ℃ for 48 h. The permeability of the core before and after injection was measured and the plugging rate was calculated, see table 5:
TABLE 5
| Example 3 | Example 6 | Example 7 | |
| Permeability before injection, 10-3μm2 | 85.10 | 95.30 | 260.40 |
| Permeability before injection, 10-3μm2 | 1.80 | 3.50 | 21.50 |
| Plugging rate% | 97.88 | 96.33 | 91.74 |
As can be seen from Table 5, the plugging rate gradually decreases with the increase of the core permeability, but the plugging rate exceeds 90 percent, and the requirements of on-site profile control construction can be met
The above is a detailed description of the present invention with reference to specific preferred embodiments, which should not be construed as limiting the present invention, but rather as a person of ordinary skill in the art to which the present invention pertains may make several simple deductions or substitutions without departing from the spirit of the present invention, which should be construed as belonging to the patent protection scope defined by the claims filed with the present invention.
Claims (7)
1. The oil-containing sludge profile control agent is characterized by comprising the following components in percentage by mass:
thickening agent: 0.1 to 0.5 percent;
a crosslinking agent: 0.01 to 0.5 percent;
oily sludge: 5 to 50 percent;
the balance of water;
the thickening agent is characterized in that a surfactant group is introduced into a molecule of the thickening agent, and the structural formula of the thickening agent is as follows:
wherein m is 20-30, n is 60-80, x is 1-10, y is 0.1-5, and the hydrophobic group R in the surfactant group is a C8-C18 mixed carbon chain;
the cross-linking agent is a methylol amine solution;
the structural formula of the cross-linking agent is as follows:
wherein R is2Comprises the following steps:
when the crosslinking agent is JL-POA; r2Comprises the following steps: -CH2CH2CH2CH2CH2CH2When-is, the crosslinking agent is JL-CA.
2. The oil-containing sludge profile control agent according to claim 1, wherein: the viscosity average molecular weight of the thickening agent is 1500 multiplied by 104-2000×104g/mol; the average molecular weight of the hydrophobic radical R is 182 g/mol.
3. The oil-containing sludge profile control agent according to claim 1, wherein: the thickener is prepared by the following steps:
according to the mol percentage, 20-30% of acrylic acid, 60-80% of acrylamide, 1-10% of 2-acrylamide-2-methylpropanesulfonic acid and 0.1-5% of surfactant functional monomer are dissolved by water, all the reaction monomers account for 30-35% of the total solution by mass, then an alkali solution is used for neutralization, the neutralization temperature is controlled to be less than 20 ℃ by an ice water bath, nitrogen is introduced for deoxidization, and polymerization, granulation, drying and crushing are initiated by an initiator to obtain the thickening agent.
4. The oil-containing sludge profile control agent according to claim 3, wherein: the alkali solution is a sodium hydroxide solution, and the mass concentration of the sodium hydroxide solution is 30%.
5. The oil-containing sludge profile control agent according to claim 3, wherein: the initiator is a composite initiation system consisting of the following raw materials in percentage by mass: 50-45% of ammonium persulfate, 25-20% of sodium formaldehyde sulfoxylate and 25-35% of azo V044, wherein the addition amount of the initiator accounts for 0.002-0.5% of the total mass of the reaction monomers.
6. A method for preparing the oil-containing sludge profile control agent according to claim 1, characterized by comprising the steps of:
according to the mol percentage, 20-30% of acrylic acid, 60-80% of acrylamide, 1-10% of 2-acrylamide-2-methylpropanesulfonic acid and 0.1-5% of surfactant functional monomer are dissolved by water, all reaction monomers account for 30-35% of the total solution by mass, neutralization is carried out by using an alkali solution, the neutralization temperature is controlled to be less than 20 ℃ by using an ice water bath, nitrogen is introduced for removing oxygen, polymerization, granulation, drying and crushing are initiated by an initiator to obtain a thickening agent, and the addition amount of the initiator is 0.002-0.5% of the reaction monomers by mass;
and uniformly mixing clear water and the oily sludge according to a ratio, sequentially adding the cross-linking agent and the thickening agent, and uniformly stirring to obtain the oily sludge profile control agent.
7. The method for preparing the oil-containing sludge profile control agent according to claim 6, wherein: the initiator is a composite initiation system consisting of 50-45% of ammonium persulfate, 25-20% of sodium formaldehyde sulfoxylate and 25-35% of azo V044 in percentage by mass.
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| CN110527501B (en) * | 2018-05-25 | 2022-05-10 | 中国石油天然气股份有限公司 | Salt-tolerant oil sludge profile control agent and preparation method thereof |
| CN110484225A (en) * | 2019-09-17 | 2019-11-22 | 新疆克拉玛依市采丰实业有限责任公司 | A kind of organic composite type oily sludge gel and preparation method thereof |
| CN110964490B (en) * | 2019-10-30 | 2022-01-21 | 中国石油化工股份有限公司 | Plugging adjusting system containing waste drilling fluid and preparation method thereof |
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