Sand-preventing working fluid and preparation method thereof

A working fluid and sand control technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems such as blockage of screen pipes and near-wellbore areas, poor flowback effect of sand-carrying fluid, and hydration expansion of clay. Achieve the effects of preventing clay hydration, reducing damage, and reducing damage

Active Publication Date: 2019-11-01
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although the conventional sand-carrying fluid can carry sand out, it is easy to cause blockage of the screen pipe and the near-wellbore area during the sand-carrying process, and the hydration and swelling of the clay will cause damage to the formation, and the flowback effect of the sand-carrying fluid is not good. , if it stays in the formation, it will easily cause the pollution of the formation

Method used

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  • Sand-preventing working fluid and preparation method thereof
  • Sand-preventing working fluid and preparation method thereof
  • Sand-preventing working fluid and preparation method thereof

Examples

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preparation example Construction

[0038] Another aspect of the present invention provides a method for preparing the sand control working fluid described in the first aspect of the present invention. The method is not only suitable for indoor preparation, but also for on-site preparation. The specific preparation method includes:

[0039] Step 1: Weigh water and put it into a container.

[0040] Specifically, when the sand control working fluid is prepared indoors, the container is a beaker; when the sand control working fluid is prepared on site, the container is a liquid storage tank.

[0041] It should be noted that after this step, the stirring device is started immediately to make the water in the container circulate. When preparing indoors, the stirring device can be a stirrer; when preparing on site, the stirring device can be a pump truck.

[0042] For example, when water is added into the beaker, the stirring device can be started so that the rotating speed of the stirring device reaches the water in...

Embodiment 1

[0075] This embodiment provides a method for preparing a sand control working fluid, which is suitable for indoor preparation and requires a clean beaker, an electronic balance and a stirrer.

[0076] The sand control working fluid to be prepared in this example includes the following components: 0.5g emulsifier OP-10, 0.8g emulsifier OP-7, 12g xylene, 0.5g guar gum, 3g hydroxylamine-based polyetheramine, 2g chloride Potassium and 0.5g fluorocarbon surfactant and 200ml water.

[0077] The preparation method comprises the following steps:

[0078] Step (1), 200ml water is joined in the beaker;

[0079] Step (2), start agitator;

[0080] Specifically, adjust the speed of the stirrer until the water in the beaker can form a vortex and the top of the central axis of the stirring device blade can be seen, and keep the stirrer to rotate at a constant speed;

[0081] Step (3), add 0.5g emulsifier OP-10 into water, stir evenly;

[0082] In step (4), 0.8g of emulsifier OP-7 is adde...

Embodiment 2

[0090] This embodiment provides a method for preparing a sand control working fluid, which is suitable for indoor preparation and requires a clean beaker, an electronic balance and a stirrer.

[0091] The sand control working fluid to be prepared in this example includes the following components: 0.4g emulsifier OP-10, 0.9g emulsifier OP-7, 13g xylene, 0.5g guar gum, 3g hydroxylamine polyetheramine, 3g chloride Potassium and 0.4g fluorocarbon surfactant and 200ml water.

[0092] The preparation method comprises the following steps:

[0093] Step (1), 200ml water is joined in the beaker;

[0094] Step (2), start agitator;

[0095] Specifically, adjust the speed of the stirrer until the water in the beaker can form a vortex and the top of the central axis of the stirring device blade can be seen, and keep the stirrer to rotate at a constant speed;

[0096] Step (3), add 0.4g emulsifier OP-10 into water, stir evenly;

[0097] In step (4), 0.9g of emulsifier OP-7 is added to t...

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Abstract

The invention discloses a sand-preventing working fluid and a preparation method thereof, and belongs to the technical field of oil field oil production. The sand-preventing working fluid comprises, by mass, 5.6-8.9% of a cleaning agent, 0.2-0.3% of a thickening agent, 2.0-3.5% of an anti-swelling agent, 0.2-0.3% of a clean-up additive and 87-92% of water. The cleaning agent is added to dissolve raw oil and asphaltene and plays roles of cleaning oil pipes, sieve pipes and surfaces of sandstone in the immediate vicinity of wellbores; the thickening agent is added to achieve a sand carrying function; the anti-swelling agent is added to effectively prevent clay hydration, facilitating protection of an oil reservoir; the clean-up additive is added to facilitate demulsification and cleanup so that stratum pollution caused by retention of the working fluid in a stratum can be prevented. Compared with the prior art, the working fluid has a sand carrying function and a cleaning function, and can achieve easy hydration, effective protection of oil reservoirs and reduction in harm to stratums.

Description

technical field [0001] The invention relates to the field of oil recovery technology, in particular to a sand control working fluid and a preparation method thereof. Background technique [0002] Soil sandification is serious in some oilfields in my country. Unconsolidated sandstone reservoirs in oil areas are not only widely distributed, but also have loose cementation, poor diagenesis, serious heterogeneity, and high shale content in cement, which makes sand production serious. Therefore, how to reduce the sand production during the development of unconsolidated sandstone reservoirs has become an urgent problem to be solved. [0003] The prior art reduces the sand production of unconsolidated sandstone reservoirs during the development process, usually by injecting sand control working fluid containing proppant into the formation, filling the pores and cavities in the formation through the proppant, and the sand control working fluid carries oil pipes, screens and Sand fl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/52C09K8/524C09K8/528
CPCC09K8/52C09K8/524C09K8/528C09K2208/12
Inventor 李怀文刘红燕曹庆平孙淑凤昝丽艳朱恩永耿相争王乐英李小静
Owner PETROCHINA CO LTD
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