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Resistance reducing agent for coiled tubing and preparation method and application

A technology of drag reducing agent and tubing, which is applied in the field of drag reducing agent and preparation for coiled tubing, which can solve the problems of low drag reducing rate and achieve the effects of reduced frictional resistance, low corrosion and low cost

Active Publication Date: 2018-11-20
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 above systems all have certain resistance reduction properties, but the resistance reduction rate is low

Method used

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  • Resistance reducing agent for coiled tubing and preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] This embodiment provides a drag reducing agent for coiled tubing, which is composed of the following substances in weight percentage: base oil 45-60%, anionic surfactant 14-18%, nonionic surfactant 15-20%, corrosion inhibitor Agent 5-8%, the balance is water.

[0026] The drag-reducing agent for coiled tubing provided by the present invention is used in combination with anionic surfactant and non-ionic surfactant to emulsify the base oil into small droplets and disperse them in the aqueous solution. The base oil plays the role of lubricating and reducing drag. The addition of corrosion inhibitor is used to reduce the corrosion effect of the solution on the coiled tubing.

Embodiment 2

[0028] On the basis of Example 1, this example provides a drag reducing agent for coiled tubing, which consists of the following substances in weight percent: 50% of base oil, 14% of anionic surfactant, 20% of nonionic surfactant, Corrosion inhibitor 6%, the balance is water.

[0029] Preparation:

[0030] Mix 50wt.% base oil 60N, 14wt.% sodium petroleum sulfonate, 10wt.% fatty alcohol polyoxyethylene ether and 10wt.% oleic acid diethanolamide, stir and heat to 65°C, then add 3wt.% Morpholine and 3wt.% diethanolamine, add the balance of water to make the sum of the mass percentages of each component 100%, continue to stir for 30min, and obtain a brown-yellow transparent oily drag reducer after cooling.

[0031] In this example, the base oil is 60N base oil; the anionic surfactant is sodium petroleum sulfonate; the nonionic surfactant is a compound of oleic acid diethanolamide and fatty alcohol polyoxyethylene ether (polymerization degree 10-20). Compounds, wherein, based on ...

Embodiment 3

[0033] On the basis of Example 1, this example provides a drag reducing agent for coiled tubing, which consists of the following substances in weight percentage: 55% of base oil, 16% of anionic surfactant, 18% of nonionic surfactant, Corrosion inhibitor 6%, the balance is water.

[0034] Preparation:

[0035] Mix 55wt.% base oil 60N, 8wt.% sodium petroleum sulfonate, 8wt.% sodium dodecylbenzenesulfonate, 8wt.% fatty alcohol polyoxyethylene ether and 10wt.% oleic acid diethanolamide Stir and heat to 70°C, then add 4wt.% morpholine and 2wt.% diethanolamine, add the rest of water to make the sum of the mass percentages of each component 100%, continue stirring for 30min, and obtain a brown-yellow transparent oily drag reducer after cooling .

[0036] In this example, the base oil is 60N base oil; the anionic surfactant is a compound of sodium petroleum sulfonate and sodium lauryl sulfate, based on the mass percentage of drag reducing agent, sodium petroleum sulfonate is 8% , s...

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Abstract

The invention provides a resistance reducing agent for coiled tubing, a preparation method and application. The resistance reducing agent comprises the following materials in percentage by weight: 45-60% of base oil, 14-18% of anionic surfactant, 15-20% of non-ionic surface active agent, 5-8% of corrosion inhibitor and the balance water. According to the resistance reducing agent for the coiled tubing, the anionic surfactant is used in combination with the non-ionic surface agent so as to emulsify the base oil into small liquid drops which are dispersed in an aqueous solution; the base oil hasthe effects of lubrication and resistance reduction; and the corrosion inhibitor is added and used for reducing the corrosion effect of the solution on the coiled tubing. The friction resistance between the coiled tubing and the inner wall of a wellbore can be effectively reduced through the use of the aqueous solution of the resistance reducing agent in the process of coiled tubing entering, andthus, the entering depth and entering efficiency of the coiled tubing are improved. In addition, the resistance reducing agent for the coiled tubing is low in cost, has low corrosivity on an oil casing pipe, is convenient to allocate on site and convenient to use and can be applied on a large scale.

Description

technical field [0001] The invention belongs to the technical field of coiled tubing construction in oil and gas field development, and in particular relates to a drag-reducing agent for coiled tubing, a preparation method and application thereof. Background technique [0002] In recent years, the demand for the use of coiled tubing in horizontal wells, highly deviated wells and sidetracked wells has been increasing. Due to the large change in the curvature of the wellbore trajectory of such complex-structured wells, coiled tubing will encounter larger problems than vertical wells when running. resistance. In addition, the flexibility and non-rotatability of the coiled tubing itself make it difficult to pressurize it. The above reasons together lead to frictional resistance between the coiled tubing and the inner wall of the wellbore during the running process and self-locking, so that it cannot be lowered to the predetermined depth. Follow up. [0003] At present, when th...

Claims

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Application Information

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IPC IPC(8): F17D1/17C09K8/035
CPCC09K8/035F17D1/17
Inventor 杨军费节高尹俊禄高燕宇文昔涵廖乐军陈亚联安崇清
Owner BC P INC CHINA NAT PETROLEUM CORP
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