A dual-functional depolymerization and scale-dissolving agent for oil production and its preparation and application

A scale-dissolving agent and dual-function technology, which is applied in the fields of production fluid, earthwork drilling, chemical instruments and methods, etc., can solve the problem of wellbore sticking oil suction pipe, can not dissolve oil scale to dredge formation, and can not solve formation blockage problems and other problems, to achieve a reasonable mechanism of viscosity reduction and scale dissolution, which is conducive to popularization and application, and the effect of moderate molecular weight

Active Publication Date: 2022-05-13
华睿致诚化学(山东)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the currently used viscosity reducer for oil production has a single function, which only reduces the viscosity of crude oil to a certain extent, but cannot solve the problem of formation blockage caused by oil scale formed by asphaltene long-term coagulation and sedimentation in the formation, and cannot dissolve The function of oil dirt to dredge the formation, but also can not solve the problem of wellbore sticking tubing caused by asphaltene coagulation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Add 10 grams of dedecenoic acid dimer acid and 10 grams of dodecenoic acid dimer acid to the container, then add 1 gram of OP-10, and finally add 79 grams of No. 200 solvent oil, mix and stir, and stir evenly Obtain 100 grams of depolymerization scale dissolver. The viscosity reduction rate and scale dissolution rate of the depolymerization and scale-dissolving agent are shown in Table 1 and Table 2, respectively.

Embodiment 2

[0038] First add 3 grams of palmitoleic dimer acid to the container, then add 0.1 grams of Tween-80 by weight, and finally add 30 grams of No. 200 solvent naphtha and 66.9 grams of mixed aromatic hydrocarbons, mix and stir, and obtain 100 grams of depolymerization and scale-dissolving agent after stirring evenly . The viscosity reduction rate and scale dissolution rate of the depolymerization and scale-dissolving agent are shown in Table 1 and Table 2, respectively.

Embodiment 3

[0040] First add 30 grams of oleic acid dimer acid into the container, then add 0.5 grams of OP-10 and 0.5 grams of Tween-80, and finally add 69 grams of diesel oil, mix and stir, and obtain 100 grams of depolymerization and scale-dissolving agent after stirring evenly. The viscosity reduction rate and scale dissolution rate of the depolymerization and scale-dissolving agent are shown in Table 1 and Table 2, respectively.

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Abstract

The invention relates to the field of oilfield chemistry, and discloses a dual-functional depolymerization and scale-dissolving agent for oil production, as well as its preparation and application. The depolymerization and scale dissolving agent is composed of unsaturated higher fatty acid dimer acid, surfactant and oil solvent, wherein the unsaturated higher fatty acid dimer acid is made of tendecenoic acid, dodecenoic acid, palmitoleic acid, oleic acid, Dimer acid of oleic acid, linolenic acid, eicosenoic acid and eicosadienoic acid; OP type, Tween type and Pingpinga type are used as surfactants. The dual-functional depolymerization and scale-dissolving agent for oil recovery of the present invention can not only reduce the viscosity of ordinary crude oil and heavy oil through depolymerization, but also dissolve the oil scale formed by the coagulation of crude oil through depolymerization, effectively solving the problem of dredging formation blockage and wellbore stickiness. It solves the problem of oil suction pipe, and has low cost and good safety. It is suitable for large-scale oilfield crude oil and heavy oil production, and has a significant effect on the transformation of old oilfield reservoirs and the in-situ dissolution of oil scale underground.

Description

technical field [0001] The invention relates to the field of oil field chemistry, in particular to a dual-functional depolymerization and scale-dissolving agent for oil recovery and its preparation and application, especially closely related to crude oil recovery. Background technique [0002] At present, the proportion of heavy oil in crude oil production is getting higher and higher, and it is increasingly important to improve the utilization efficiency of heavy oil resources. Not only the newly discovered oil fields need to increase the recovery rate of crude oil, but also for old oil fields, it is necessary to tap the resource potential and extract the remaining crude oil in the oil wells by various means to maximize the benefits of resources. [0003] However, it is well known that heavy oil has high density, high viscosity, high metal content, unstable properties, and easy coagulation and sedimentation, which brings difficulties to production. Oil wells in old oilfiel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/524C09K8/584E21B37/06E21B43/22
Inventor 时念云王锐
Owner 华睿致诚化学(山东)有限公司
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