Efficient wax inhibitor for oilfields

A wax inhibitor and high-efficiency technology, applied in drilling compositions, chemical instruments and methods, etc., can solve the problem of poor use effect of the wax inhibitor, and achieve good application effect, strong adaptability, and extended well cleaning cycle. Effect

Inactive Publication Date: 2015-11-25
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a high-efficiency wax inhibitor for oil fields in order to solve the problem that the existing wax inhibitors are not effective in the process of oil exploitation.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A high-efficiency wax inhibitor for oilfields provided by the invention is an oil-based wax inhibitor, which is compounded from a wax crystal modifier, a wax crystal dispersant, a nonionic surfactant and a solvent, wherein the wax crystal modifier is A mixture of pentapolymer and ethylene-vinyl acetate, the weight ratio of pentapolymer and ethylene-vinyl acetate is 1:2, the weight percentage of wax crystal modifier is 0.5%, and the wax crystal dispersant is petroleum sulfonate Salt, its weight percentage is 10%, nonionic surfactant is AE type surfactant or AR type surfactant, its weight percentage is 5%, and the weight percentage of solvent is 84.5%.

[0016] Concrete preparation steps are as follows:

[0017] The octadecyl acrylate, stearyl methacrylate, maleic anhydride, vinyl acetate and acrylamide copolymer in the wax crystal modifier, the molar ratio is 4:4:2:1:1, and its specific preparation is as follows :

[0018] (1) preparation of octadecyl acrylate:

[001...

Embodiment 2

[0030] A high-efficiency wax inhibitor for oilfields provided by the invention is an oil-based wax inhibitor, which is compounded from a wax crystal modifier, a wax crystal dispersant, a nonionic surfactant and a solvent, wherein the wax crystal modifier is A mixture of pentapolymer and ethylene-vinyl acetate, the weight ratio of pentapolymer and ethylene-vinyl acetate is 1:2, the weight percentage of wax crystal modifier is 15%, and the wax crystal dispersant is petroleum sulfonate Salt, its weight percentage is 30%, the nonionic surfactant is AE type surfactant or AR type surfactant, its weight percentage is 25%, and the weight percentage of solvent is 30%.

[0031] Concrete preparation steps are as follows:

[0032] The wax crystal modifier is stearyl acrylate, stearyl methacrylate, maleic anhydride, vinyl acetate and acrylamide pentapolymer, and its molar ratio is 2:2:2:1:1, and its specific Prepare as follows:

[0033] (1) preparation of octadecyl acrylate:

[0034] In...

Embodiment 3

[0045] A high-efficiency wax inhibitor for oilfields provided by the invention is an oil-based wax inhibitor, which is compounded from a wax crystal modifier, a wax crystal dispersant, a nonionic surfactant and a solvent, wherein the wax crystal modifier is A mixture of pentapolymer and ethylene-vinyl acetate, the weight ratio of pentapolymer and ethylene-vinyl acetate is 1:2, the weight percentage of wax crystal modifier is 8%, and the wax crystal dispersant is petroleum sulphur Salt, its weight percentage is 20%, the nonionic surfactant is AE type surfactant or AR type surfactant, its weight percentage is 15%, and the weight percentage of solvent is 57%.

[0046] Concrete preparation steps are as follows:

[0047] The octadecyl acrylate, stearyl methacrylate, maleic anhydride, vinyl acetate and acrylamide copolymer in the wax crystal modifier, the molar ratio is 4:4:2:1:1, and its specific preparation is as follows :

[0048] (1) preparation of octadecyl acrylate:

[0049...

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PUM

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Abstract

The invention discloses an efficient wax inhibitor for oilfields. The efficient wax inhibitor, namely an oil-based wax inhibitor, is obtained by compounding of a wax-crystal modifier, a wax-crystal dispersant, a nonionic surfactant and a solvent; the wax-crystal modifier is a mixture of pentabasic copolymers and ethylene-vinyl acetate, and the weight ratio of the pentabasic copolymers to the ethylene-vinyl acetate is 1:2; the efficient wax inhibitor comprises, by weight, 0.5-1.5% of the wax-crystal modifier, 10-30% of the wax-crystal dispersant, namely mahogany petroleum sulfonate, 5-25% of the nonionic surfactant, namely AE-type surfactant or AR-type surfactant, and the balance solvent. The efficient wax inhibitor has the advantages that production cost is reduced greatly, production efficiency is improved, well flushing cycle is prolonged to about 50 days, application effect is good, and average daily incremental oil rate reaches 10%.

Description

technical field [0001] The invention relates to an anti-wax agent, in particular to a high-efficiency anti-wax agent for oil fields. Background technique [0002] At present, my country's oil field crude oil has high wax content, and also contains colloidal asphaltenes with high density and viscosity. Waxes are dissolved in crude oil in a molecular state under oil reservoir conditions, and the light components have not yet escaped. At this time, the crude oil has a strong wax-dissolving ability, so the oil well and the bottom of the well are not easy to deposit wax. When the oil flow is closer to the ground, the temperature is lower than the cloud point of the crude oil, and the pressure is lower than the saturation pressure of the crude oil, the light components begin to overflow from the crude oil, the wax-dissolving ability of the crude oil gradually weakens, and the wax crystals begin to flow from the crude oil continuously. A large amount of precipitation in crude oil....

Claims

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Application Information

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IPC IPC(8): C09K8/524
CPCC09K8/524
Inventor 李学文吴梦娇吉树鹏李树军贾广华
Owner CHINA PETROLEUM & CHEM CORP
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