Modified polymer acids shear-enhancing agent for oil-based drilling fluids and preparation method thereof

An oil-based drilling fluid and polyacid technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of increasing plastic viscosity, prone to chain scission, and improving the ratio of dynamic to plastic, so as to improve the dynamic cutting force, improve sand carrying capacity, and improve the effect of shear force

Inactive Publication Date: 2016-03-02
CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, these shearing agents all have the following problems: when increasing the shear force, the plastic viscosity will be greatly increased, which is not conducive to improving the dynamic-plastic ratio; the effect is better under high shear conditions, but the effect is not obvious under low shear conditions; The bond energy of the main functional group is low, and it is prone to chain scission and failure under high temperature conditions
Generally speaking, the existing technologies related to shear lifting agents are more suitable for medium and low density oil-based drilling fluids, but they cannot solve the problems existing in high-temperature resistant high-density oil-based drilling fluids

Method used

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  • Modified polymer acids shear-enhancing agent for oil-based drilling fluids and preparation method thereof
  • Modified polymer acids shear-enhancing agent for oil-based drilling fluids and preparation method thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0031] A modified polymeric acid cutting agent for oil-based drilling fluid, which is composed of the following components: polymeric acid, polyene polyamine and primary amine, wherein the combination of polymeric acid monomer and polyene polyamine monomer The molar ratio is 1.8-2:0.9-1.1, and the molar addition amount of the primary amine is the same as that of the polyene polyamine monomer.

[0032] The polymeric acid is a mixture consisting of oleic acid, linoleic acid, and dimers and trimers of oleic acid and linoleic acid, wherein the mass ratio is: 0.5% to 1% of oleic acid and linoleic acid %, trimer is 1 to 1.5%, and the balance is dimer. The ratio of oleic acid and linoleic acid is 0.5% to 1%. There is no special requirement for the ratio of oleic acid and linoleic acid, as long as it is guaranteed to contain oleic acid and linoleic acid and meet the aforementioned ratio. Among dimers and trimers, including dimers and trimers of oleic acid and dimers and trimers of li...

Embodiment 2

[0047] The invention provides a modified polymeric acid shear-lifting agent for high-temperature-resistant and high-density oil-based drilling fluid, which is formed by polycondensation of polymeric acid, polyene polyamine and primary amine through dehydration reaction, wherein the polymeric acid is a A mixture consisting of oleic acid, linoleic acid, and dimers and trimers of oleic acid and linoleic acid; polyene polyamines are ethylenediamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine One of them; the primary amine is one of propylamine, butylamine, diethylamine, isopropylamine and aniline.

[0048] The present invention also provides a preparation method of a modified polymeric acid shear-lifting agent for high-temperature-resistant and high-density oil-based drilling fluid, specifically as follows:

[0049]1. Add the polymeric acid and polyene polyamine monomer into a three-necked flask according to the molar ratio of 1.8~2:0.9~1.1, heat to 80°C in a...

Embodiment 3

[0060] This embodiment is basically the same as the above-mentioned embodiment, the main differences are as follows:

[0061] A modified polymeric acid cutting agent for oil-based drilling fluid, which is composed of the following components: polymeric acid, polyene polyamine and primary amine, wherein the combination of polymeric acid monomer and polyene polyamine monomer The molar ratio is 1.8:0.9, and the molar addition amount of the primary amine is the same as that of the polyene polyamine monomer.

[0062] The polymeric acid is a mixture consisting of oleic acid, linoleic acid, and dimers and trimers of oleic acid and linoleic acid, wherein the mass ratio is: 0.5% of oleic acid and linoleic acid, three The polymer was 1%, and the balance was dimer.

[0063] A method for preparing a modified polymeric acid shear-lifting agent for oil-based drilling fluids, comprising: polyacid, polyene polyamine and primary amine are dehydrated and polycondensed, wherein the polymeric ac...

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Abstract

The invention discloses a modified polymer acids shear-enhancing agent for oil-based drilling fluids and a preparation method thereof. The modified polymer acids shear-enhancing agent for oil-based drilling fluids is composed of the following ingredients: polymer acids, polyethylene-polyamine and primary amine, wherein molar ratio of polymer acids to polyethylene-polyamine monomer is 1.8-2:0.9-1.1; and molar weight of primary amine is the same as molar weight of the polyethylene-polyamine monomer. The Modified polymer acids shear-enhancing agent for high-temperature oil-based drilling fluids is formed by a dehydration polycondensation reaction. The shear-enhancing agent belongs to a low-molecular-weight polymer shear-enhancing agent, and has strong shear-enhancing ability. By the use of the shear-enhancing agent, plastic viscosity is not affected, and ratio of dynamic shear force of drilling fluids can be effectively raised. A stable molecular structure also endows the shear-enhancing agent with strong high temperature resistance.

Description

Technical field [0001] The present invention involves a modified polycostic acid incision and preparation method for the use of oil -based drilling liquid, which is mainly used in the oil and natural gas drilling industry. Background technique [0002] Oil -based drilling solution has excellent performance such as good lubrication, strong inhibitoryness, and small damage to the ground. It has been widely used in various complex strata drilling.However, the cut force of the oil -based drilling fluid is low, which has adversely affect the effect of drilling fluid with the effect of the agglomeration.In order to ensure that it has appropriate cutting force and overcome the above problems, it is usually added to adjust the cutting agent to adjust the oil base drilling fluid. [0003] At present, the more commonly used jellyfish are polyocylite, modified polyoxyethylene ether fat amine, small molecular polarity organic matter, and their mixtures, such as a kind of fluorine -containing...

Claims

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Application Information

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IPC IPC(8): C09K8/035C09K8/32
CPCC09K8/035C09K8/32
Inventor 王君黄平贺垠博李茂森蒋官澄张坤杨兰平孔燕燕
Owner CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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