Offshore oilfield anti-emulsification workover fluid as well as preparation method and use method thereof

An offshore oil field, anti-emulsification technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems such as impact, limited processing capacity of surface oil-water separation devices, and affect normal production of offshore platforms, etc., to achieve enhanced flowback performance , Improve production capacity recovery effect, solve the effect of demulsification and dehydration difficulties

Pending Publication Date: 2022-08-05
CNOOC TIANJIN BRANCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, limited by the space of the offshore platform, the processing capacity of the surface oil-water separation device is limited, and a large amount of oil-water emulsion in the workover flowback fluid will seriously impact the surface oil-water treatment process, affecting the normal production of the offshore platform

Method used

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  • Offshore oilfield anti-emulsification workover fluid as well as preparation method and use method thereof
  • Offshore oilfield anti-emulsification workover fluid as well as preparation method and use method thereof
  • Offshore oilfield anti-emulsification workover fluid as well as preparation method and use method thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0032] The present invention also proposes a method for preparing an anti-emulsification workover fluid in an offshore oilfield, which comprises the following steps: 1) water is obtained through pretreatment of production sewage and / or water source well water; the water conforms to the requirements of "Q / HS2042-2014 2) Add the water into the constant temperature stirring tank for heating, so that the temperature of the water is greater than 50 °C; 3) In terms of mass percentage, add 0.5-1.5 % of the drainage aid cleaning agent and 0.1-0.5% of the demulsifier, and stirred evenly to obtain the anti-emulsification workover fluid in the offshore oil field, the total amount of which is 100%.

[0033] The present invention also proposes a method for using the anti-emulsification workover fluid in the offshore oil field to control the temperature of entering the well of the anti-emulsification workover fluid in the offshore oil field to >50°C. By controlling the temperature of the wo...

Embodiment 1

[0062] Add water to the constant temperature stirring tank and heat it to make the water temperature > 50°C; add 1.5% of drainage aid cleaning agent and 0.4% of demulsifier to it, and stir evenly, the total amount is 100%. Wherein, the drainage aid cleaning agent is a mixed aqueous solution comprising sodium dodecylbenzene sulfonate, octadecyl hydroxypropyl sulfobetaine, sodium lignosulfonate and glycerol, wherein the dodecyl The effective content of sodium benzene sulfonate ≥ 15%, the effective content of octadecyl hydroxypropyl sulfobetaine ≥ 15%, the effective content of sodium lignosulfonate ≥ 10%, the effective content of glycerol ≥ 10% . The demulsifier is an aqueous solution of bisphenol A phenolic resin-based polyether, the effective content of which is greater than or equal to 30%.

[0063] The performance evaluation results of the workover fluid of this embodiment are shown in Tables 1 to 4 below.

Embodiment 2

[0065] The same as in Example 1, the proportions of the raw materials are as follows: 1.0% of a cleaning aid for drainage and 0.5% of a demulsifier.

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Abstract

The invention relates to an anti-emulsification workover fluid for an offshore oilfield as well as a preparation method and a use method of the anti-emulsification workover fluid. The anti-emulsification workover fluid for the offshore oilfield comprises the following components in percentage by mass: 0.5-1.5% of a drainage-aiding cleaning agent, 0.1-0.5% of a demulsifying agent and the balance of water, the water is selected from production sewage and/or water source well water; adding water into a stirring tank, heating to 50 DEG C or above, adding other raw materials, and uniformly stirring; and controlling the in-well temperature of the anti-emulsification workover fluid for the offshore oilfield to be higher than 50 DEG C. The technical problem to be solved is how to provide the anti-emulsification workover fluid for the offshore oilfield, reduce the damage of the anti-emulsification workover fluid to a reservoir, improve the recovery effect of the oil well yield after well repair and reduce the treatment capacity of oil-water separation of a workover flow-back fluid on an offshore platform, so that the anti-emulsification workover fluid is more practical.

Description

technical field [0001] The invention relates to the technical field of oilfield chemistry, in particular to an anti-emulsification workover fluid in an offshore oilfield and a preparation method and a use method thereof. Background technique [0002] Offshore oilfields have the characteristics of high single-well production, mostly horizontal wells, and loose sandstone heavy oil reservoirs. Due to the special environment of offshore platforms, the water source of workover working fluid is complex, including production sewage, water source well water, etc. and seawater etc. It mainly has the following disadvantages: [0003] One is the long-term, high-intensity production of horizontal wells. Due to the low formation pressure coefficient and the long horizontal well section, the commonly used temporary plugging fluid systems are not ideal for controlling leakage during the operation of horizontal wells in offshore oilfields. The leakage of foreign working fluid can easily c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/524C09K8/52
CPCC09K8/524C09K8/52
Inventor 白健华刘义刚陈华兴庞铭吴华晓赵顺超方涛王宇飞王志远尚宝兵
Owner CNOOC TIANJIN BRANCH
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