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Viscosity-reducing sand-carrying fluid and preparation method thereof

A sand-carrying liquid and viscosity-reducing technology, which is applied in chemical instruments and methods, earthwork drilling, production fluids, etc., can solve the problem of unimproved flow capacity of heavy oil in the near-wellbore area, reduced flow capacity of formation crude oil, and decline in liquid production, etc. question

Inactive Publication Date: 2020-02-14
DAGANG OIL FIELD GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] (1) The "cooling effect" leads to a decrease in liquid production
[0004] When a large amount of external fluid (workover fluid, killing fluid, sand-carrying fluid, etc.) Colloids, asphaltenes, etc. are precipitated, which reduces the flow capacity of formation crude oil and leads to a decrease in liquid production
[0005] (2) The sand-carrying liquid prepared by hot water has no obvious improvement on the flow ability of crude oil
[0006] After the sand-carrying fluid prepared by hot water enters the formation, the reservoir damage caused by the "cooling effect" is weakened, but the flow ability of the heavy oil near the wellbore is not improved

Method used

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  • Viscosity-reducing sand-carrying fluid and preparation method thereof
  • Viscosity-reducing sand-carrying fluid and preparation method thereof
  • Viscosity-reducing sand-carrying fluid and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Embodiment 1: add 400ml tap water in the clean beaker, adjust the stirrer rotating speed to the vortex that liquid forms and can see till the top of the stirrer paddle axis, keep the stirrer to rotate at a constant speed, take by weighing 1g modified guar gum according to the formula Add water slowly, then weigh 4g anti-swelling agent hydroxyaminopolyetheramine, 0.8g drainage aid sodium perfluorononenyloxybenzene sulfonate, 10g demulsifier polyoxyethylene polyoxypropylene phosphate and 20g viscosity reducer The organosilicon sulfonate is added to the solution in sequence and stirred evenly, and after each additive is added, the next additive is added after stirring evenly, so that the viscosity-reducing and sand-controlling liquid system solution is obtained.

[0032] The performance index of the solution after preparation is as follows:

[0033] 1) Stability performance: stability at room temperature

[0034] Store a viscosity-reducing sand-carrying fluid in a sealed ...

Embodiment 3

[0070] Example 3: Pumping well Chenglong 1601 well, sand control layer Ng14#, 15-1#, sand control well section: 1252.2-1256.3m, 1261.8-1265.8m, this well is located in the heavy oil well area, sand plugging is serious, and extrusion is preferred The sand control technology of gravel packing is used for sand control, and the viscosity-reducing sand-carrying fluid is used to carry the gravel filling to the depth of the formation, near the wellbore and the annulus, so as to form a multi-level sand retaining barrier and restore the normal production of the oil well. After the sand control construction, the daily oil production is 2.68 tons, and the daily liquid production is 7.62m 3 , the water content is 64.86%, and the effect of sand control and production increase is obvious.

[0071] The composition of a viscosity-reducing sand-carrying fluid formula of this well is as follows:

[0072] 0.25% guar gum + 1.0% anti-swelling agent + 0.2% drainage aid + 2.5% demulsifier + 4% visc...

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Abstract

The invention belongs to the technical field of oil extraction, and particularly relates to a viscosity-reducing sand-carrying fluid and a preparation method thereof. The viscosity-reducing sand-carrying fluid comprises the following components in parts by mass: 0.25-0.30 part of a thickening agent; 0.5 to 1.0 part of an anti-swelling agent; 0.20 to 0.30 part of a cleanup additive; 1.5 to 2.5 parts of a demulsifying agent; 3.0 to 5.0 parts of a viscosity reducer; 90-100 parts of water. The viscosity-reducing sand-carrying fluid is capable of smoothly bringing a propping agent into stratum to fill channels and pores; the added anti-swelling agent can prevent clay from hydration migration, the added demulsifying agent can realize oil water separation, and realize demulsifying of oil-water emulsion in a short time, the viscosity reducer plays a role to reduce the viscosity of crude oil, and after construction is finished, the viscosity-reducing sand-carrying fluid is subjected to gel breaking and flowing back under the action of formation temperature, pressure and the cleanup additive.

Description

technical field [0001] The invention belongs to the technical field of oil recovery, and in particular relates to a viscosity-reducing sand-carrying fluid and a preparation method thereof. Background technique [0002] Sand production is common in the production of heavy oil wells, especially unconsolidated sandstone heavy oil reservoirs, which are characterized by shallow burial depth (1300-1500m), thick oil and easy sand production in oil layers, mainly concentrated in Yangsanmu, Kongdian, Yangerzhuang and other oil fields. For sand control in heavy oil reservoirs, the conventional sand-carrying fluid is currently used to carry gravel into the formation, and build a sand-retaining barrier in the wellbore and near the wellbore to prevent sand from the formation. However, some heavy oil wells experienced a decline in fluid production after sand control, such as Well Chenglong 1601 (crude oil viscosity 12457mPa·s, 50°C) and Liu 7-9 Well (crude oil viscosity 10339mPa·s, 50°C)...

Claims

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Application Information

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IPC IPC(8): C09K8/575C09K8/80C09K8/584
CPCC09K8/5755C09K8/5758C09K8/584C09K8/602C09K8/604C09K8/80C09K2208/12
Inventor 李怀文刘红燕刘伟曹庆平王超朱英斌宋志勇
Owner DAGANG OIL FIELD GRP
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