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Polymer viscous acid

A technology of thickening acid and polymer, which is applied in the direction of drilling compositions, chemical instruments and methods, etc. It can solve the limitation of thickening stability of thickening agent, high temperature resistance, insufficient salt resistance, viscosity of thickened acid system Not high enough to achieve the effect of strong ability to suspend fine sand, low filtration loss, and improve temperature resistance

Pending Publication Date: 2017-02-22
SICHUAN GUANGYA POLYMER CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The thickening acid thickeners currently used in industry are mainly polysaccharide polymers, which have the following deficiencies: ① Insufficient high temperature resistance and salt resistance; Very well meet the needs of practical oilfield applications; ③ Poor shear resistance, which has certain restrictions on the thickening stability of the thickener; ④ Poor solubility, it takes a lot of time to prepare on site, which improves the construction efficiency. cost

Method used

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  • Polymer viscous acid
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Examples

Experimental program
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preparation example Construction

[0042] The preparation method of above-mentioned hydrophobic association polymer, comprises the following steps:

[0043] The hydrophilic monomer, the cationic hydrophobic monomer and the functional monomer are mixed in a solvent, and an initiator is added to carry out a polymerization reaction to obtain a hydrophobic association polymer.

[0044] Preferably, adiabatic polymerization is adopted, and solvent, hydrophilic monomer, functional monomer and hydrophobic monomer are sequentially added, and when the temperature is adjusted to -5°C to 50°C in a water bath, an initiator is added to carry out polymerization reaction.

[0045] The solvent is preferably water.

[0046] The hydrophilic monomer, cationic hydrophobic monomer and functional monomer are the same as above, and will not be repeated here.

[0047] When z is 0, no functional monomer is added during the preparation process.

[0048] The dosage of each monomer can be proportioned according to the mole percentage of ...

Embodiment 1

[0073] Dissolve acrylamide and 0.1mol% acryloyloxyethyl dodecyl ammonium chloride in a 5000mL beaker with pure water to prepare a solution with a concentration of 25wt%, and add the initiator ammonium persulfate after keeping the temperature in a water bath to -5°C 1. Sodium bisulfite initiates polymerization, the concentration of oxidant is 0.012% of the monomer mass, the polymerization reaction is carried out in an adiabatic environment, a thermometer is inserted in the center of the reaction system to monitor the progress of the polymerization reaction, the reaction time is about 4-8h, when the temperature within 30 minutes The polymerization reaction is considered to be substantially complete when the rise does not exceed 1°C. One hour after the completion of the polymerization reaction, take out the colloid, cut the colloid into 3-5mm size particles, spread the colloid on a 500-mesh screen, put it in an oven at a constant temperature of 90°C and dry it for 40-90 minutes, t...

Embodiment 2～12

[0076] According to the method of Example 1, the hydrophobic association polymer was prepared using the raw material ratio in Table 1. The results are shown in Table 1. Table 1 is a summary of the raw material ratios in Examples 2-12.

[0077] The raw material proportioning of table 1 embodiment 2~12

[0078]

[0079]

[0080] Adopt infrared spectrum to carry out structure detection to the polymkeric substance prepared in embodiment 2, the results are shown in figure 1 , figure 1 It is the infrared absorption spectrum of the polymer prepared in Example 2.

[0081] figure 1 Middle, in the Fourier transform infrared spectrum, 3571cm -1 and 3184cm -1 Antisymmetric and symmetric stretch vibration peaks attributable to N-H bonds; 2942cm -1 and 1454cm -1 Stretching vibration peak and bending vibration peak respectively attributed to C-H bond, 1673cm -1 It belongs to the stretching vibration peak of amide I band C=O, 1611cm -1 Assigned to the N-H bending vibration peak ...

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Abstract

The invention provides a polymer viscous acid. The polymer viscous acid comprises acid, a hydrophobic associative polymer thickener, a corrosion inhibitor and an iron ion stabilizer. According to the invention, the hydrophobic associative polymer thickener is adopted as a thickening agent of the viscous acid. Hydrophobic groups of the polymer are associated together in the acid liquid, such that a huge space network structure is formed in the solution, and solution thickening property is improved. The diffusion speed of hydrogen ions in the acid liquid to cracks and gaps is reduced. Also, a formed associated network structure assists in effectively limiting the activity of hydrogen ions. Therefore, acid liquid consumption rate is greatly reduced, effective action distance is increased, acid rock reaction is retarded, crack width is increased, and stratum permeability is improved. The association of hydrophobic groups also assists in improving the temperature resistance and salt resistance of the solution. The formed associative polymer has lower hydrogen ion mass transfer coefficient under high temperature and better high-temperature resistance. The prepared viscous acid has the characteristics of low filtration loss, low friction resistance and high fine sand suspension capacity, such that secondary stratum damage can be retarded.

Description

technical field [0001] The invention relates to the technical field of oilfield development, in particular to a polymer thickened acid. Background technique [0002] With the rapid development of the petroleum industry, the field of petroleum and natural gas exploration continues to expand, and a large number of carbonate reservoirs and sandstone reservoirs are gradually discovered. At present, one (or several) acid liquids or acid mixed liquids are injected into the formation through the oil and gas wellbore, and the H in the acid liquid is used to + Chemically react with some minerals in the formation, dissolve the pore or fracture wall rock cement in the reservoir to increase the permeability of the formation, remove the pollution near the bottom of the injection well (water well) of the production well, and restore the permeability of the formation, thereby Relieve the damage caused to the formation near the wellbore during the process of drilling, completion, workover ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/74C08F220/56C08F226/04C08F220/58C08F228/02C08F220/34C08F226/10C08F212/14
CPCC09K8/74C08F220/56C08F226/04C08F220/585C08F212/14C08F220/34C08F226/10
Inventor 郭拥军张新民李华兵蔡术威毛慧斐
Owner SICHUAN GUANGYA POLYMER CHEM
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