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Barium-strontium-calcium descaling and plugging-removing agent for near wellbore zone and preparation method thereof

A near-well zone and plug-removing agent technology, applied in chemical instruments and methods, drilling compositions, etc., can solve problems such as inability to completely suppress

Active Publication Date: 2018-08-24
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The mechanism is to complex calcium, strontium, barium and other divalent ions through chelating agents to prevent them from contacting with sulfate to form insoluble inorganic salts, and to prevent the formation of scale by preventing the aggregation and growth of insoluble salt crystals; published patent CN201210404432 .X, CN201210408497.1, CN201210484135.0, etc. have disclosed the scale inhibition performance of scale inhibitors and the testing methods of influencing factors; however, this approach can only slow down scaling, and cannot completely inhibit

Method used

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  • Barium-strontium-calcium descaling and plugging-removing agent for near wellbore zone and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Preparation of polyamine:

[0028] At room temperature, dissolve 50mL of triethylenetetramine in 50mL of water, slowly add 24.9g of epichlorohydrin dropwise in an ice-water bath with stirring, and control the reaction temperature at 5-30°C during the dropwise addition. After the addition, return to room temperature and continue stirring for 1 h, then raise the temperature to 60° C. and continue stirring for 4 h, stop heating, and cool to room temperature to obtain a polyamine intermediate;

[0029] (2) Preparation of polyamine carboxylate:

[0030] Dissolve 109g of chloroacetic acid into 218g of 2°C ice water, control the temperature in an ice-water bath, slowly add 154g of 30% sodium hydroxide solution to it while stirring, control the temperature of the reaction solution not to exceed 30°C, and react to obtain chlorine Sodium acetate solution was added to the polyamine solution obtained in step (1), stirred for 10 minutes, then the pH of the solution was adjusted...

Embodiment 2

[0034] (1) Preparation of polyamine:

[0035] At room temperature, dissolve 50mL of diethylenetriamine in 100mL of water, slowly add 40g of epichlorohydrin dropwise in an ice-water bath with stirring, and control the reaction temperature at 5-30°C during the dropwise addition, dropwise Return to room temperature and continue stirring for 1 h after completion, then raise the temperature to 60° C. and continue stirring for 5 h, stop heating, and cool to room temperature to obtain a polyamine intermediate;

[0036] (2) Preparation of polyamine carboxylate:

[0037] Dissolve 172g of chloroacetic acid into 344g of 2°C ice water, control the temperature in an ice-water bath, slowly add 242g of 30% sodium hydroxide solution to it while stirring, control the temperature of the reaction solution not to exceed 30°C, and react to obtain chlorine Sodium acetate solution was added to the polyamine solution obtained in step (1), stirred for 10 minutes, then the pH of the solution was adjus...

Embodiment 3

[0041] (1) Preparation of polyamine:

[0042] At room temperature, dissolve 50mL of diethylenetriamine in 100mL of water, slowly add 40g of epichlorohydrin dropwise in an ice-water bath with stirring, and control the reaction temperature at 5-30°C during the dropwise addition, dropwise Return to room temperature and continue stirring for 1 h after completion, then raise the temperature to 60° C. and continue stirring for 5 h, stop heating, and cool to room temperature to obtain a polyamine intermediate;

[0043] (2) Preparation of polyamine carboxylate:

[0044] Dissolve 108g of chloroacetic acid into 216g of 2°C ice water, control the temperature in an ice-water bath, slowly add 152g of 30% sodium hydroxide solution to it while stirring, control the temperature of the reaction solution not to exceed 30°C, and react to obtain chlorine Sodium acetate solution was added to the polyamine solution prepared in step (1), stirred for 10 minutes, then the pH of the solution was adjus...

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Abstract

The invention discloses a barium-strontium-calcium descaling and blockage removing agent for a near-well area and a preparing method of the barium-strontium-calcium descaling and blockage removing agent. The barium-strontium-calcium descaling and blockage removing agent comprises a polyamine carboxylate solution, nonionic surfactant accounting for 3%-10% of the total mass of the polyamine carboxylate solution and an emulsion breaker accounting for 2%-8% of the total mass of the polyamine carboxylate solution. The polyamine carboxylate solution is prepared from polyamine midbody and chloroacetic acid salt through a reaction, wherein the polyamine midbody is prepared through organic amine and epoxy chloropropane with the mole ratio of 1.05-1.5:1 through a reaction, and the chloroacetic acid salt is prepared from chloroacetic acid and alkali with the same mole ratio through a reaction. The barium-strontium-calcium descaling and blockage removing agent for the near-well area has a good removing effect on indissolvable salt such as barium sulfate, strontium sulfate and calcium sulfate, and the descaling rate is higher than 40%. Meanwhile, the barium-strontium-calcium descaling and blockage removing agent has the expansion preventing and inhibiting performance, the clay expansion reducing rate is higher than 80%, corrosion to equipment is slight, and water locking can be avoided. Blockage removing can be effectively achieved on a reservoir stratum near a well, the permeability of the reservoir stratum is improved, and thus the recovery ratio of oil and gas resources is increased.

Description

technical field [0001] The invention relates to a scale-removing and blocking-removing agent used in near-well areas of oil fields and a preparation method thereof, in particular to a scale-removing and blocking-removing agent for calcium sulfate, strontium sulfate and barium sulfate used in oil fields and a preparation method thereof. Background technique [0002] In the development process of oil and gas resources, the method of using water injection to enhance recovery has been widely used in major domestic oil fields. Since both the injected water and the reservoir are rich in Ca 2+ 、Ba 2+ 、Sr 2+ Isocations and SO 4 2- When these cations meet with anions, insoluble salts such as calcium sulfate, barium sulfate, and strontium sulfate will be generated, which will lead to structural phenomena in water injection formations, oil casings, gathering pipelines, and ground equipment, seriously affecting oil and gas resources. mining. In addition, because most drilling flui...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/528
CPCC09K8/528C09K2208/12
Inventor 刘音解洪祥王红科周振良李立昌
Owner BC P INC CHINA NAT PETROLEUM CORP
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