Degradable resin nano-composite material for oil and gas field operation and preparation method thereof

A nano-composite material and degradable resin technology, applied in the field of degradable resin nano-composite materials and its preparation, can solve the problems of insufficient water output, formation damage, long contact time, etc.

Inactive Publication Date: 2015-10-07
CHINA UNIV OF PETROLEUM (BEIJING) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, these temporary plugging materials have some shortcomings and deficiencies. For water-soluble temporary plugging materials, the carrier fluid needs to be organic hydrocarbons, and after the operation is completed, there needs to be a sufficient amount of water in the formation. During the subsequent liquid drainage process, The produced water in the formation dissolves it, removes its temporary blockage, and dredges the oil and gas channels. If there is not enough water in the formation, or the formation pressure is insufficient, and there is not enough water produced, it is necessary to squeeze water into the formation to dissolve these water solubles. Temporary plugging materials are often unable to be completely dissolved and removed, causing certain damage to the formation; acid-soluble temporary plugging materia...

Method used

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  • Degradable resin nano-composite material for oil and gas field operation and preparation method thereof
  • Degradable resin nano-composite material for oil and gas field operation and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] This embodiment provides degradable resin nanocomposites for oil and gas field operations, such as figure 1 As shown, it is prepared by the following steps:

[0048] (1) Stir and dry polycaprolactone chips with a weight average molecular weight (Mw) of 50,000 at 50-55°C and a vacuum of 90 kPa for 12 hours; Butylene glycol diacid slices were stirred and dried for 9 hours at 60-75°C and a vacuum of 90 kPa; Next, stir and dry for 7 hours, so that its moisture content is lower than 0.1wt%, preferably lower than 0.01wt%;

[0049] (2) 200 kilograms of polycaprolactone slices, 100 kilograms of polybutylene succinate slices and 700 kilograms of polylactic acid slices after getting the above-mentioned dehydration are added in the stainless steel mixer with agitator, heated up to 45°C, under a vacuum of 90 kPa, mix for 10 minutes;

[0050] (3) Add the mixture of polycaprolactone, polybutylene succinate and polylactic acid in the mixer to the reciprocating single-screw mixing e...

Embodiment 2

[0057] This embodiment provides degradable resin nanocomposites for oil and gas field operations, such as figure 1 As shown, it is prepared by the following steps:

[0058] (1) Stir and dry polycaprolactone chips with a weight average molecular weight (Mw) of 20,000 at 50-55°C and a vacuum of 90 kPa for 6 hours; At 60-75° C. and a vacuum of 90 kilopascals, the butylene glycol ester chips were stirred and dried for 5 hours; after the pretreatment, the water content of the two polymers was lower than 0.1 wt%, preferably lower than 0.01wt%;

[0059] (2) Take 800 kilograms of polycaprolactone slices and 200 kilograms of polybutylene succinate slices after dewatering and add them to a stainless steel mixer with a stirring device, heat up to 45 ° C, and At 90 kPa, mix for 7 minutes;

[0060] (3) Add the mixture of polycaprolactone and polybutylene succinate in the mixer to the reciprocating single-screw mixing extruder, and add 5 kg of silicon dioxide with a particle diameter of ...

Embodiment 3

[0067] This embodiment provides degradable resin nanocomposites for oil and gas field operations, such as figure 1 As shown, it is prepared by the following steps:

[0068]Get the PCL / PBS / PLA resin nano-alloy slices obtained in Example 1, use an injection molding machine to carry out injection molding processing, during injection molding, the feed port temperature is 25 ° C, and the PCL / PBS / PLA resin nano-alloy slices are heated to 170 ° C , the balanced screw speed is 150 rpm, the back pressure is 500 kPa, the feeding temperature is 160 °C, the metering section temperature is 200 °C, the injection port temperature is 200 °C, the mold temperature is 25 °C, and the injection speed should be appropriately faster , using a Φ10mm mold to produce a Φ10mm spherical degradable resin nanocomposite material, which can be used for perforating blastholes and screens to meet the temporary plugging construction requirements for long well sections or extremely thick span reservoirs....

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Abstract

The invention provides a degradable resin nano-composite material for oil and gas field operation and a preparation method thereof. The preparation method of the composite material comprises the steps of using two or three polymers of polycaprolactone, polybutylenes succinate and polylactic acid as raw materials, adding inorganic nano-materials and chain extender, performing melt-mixing reaction to prepare resin nano-alloy, i.e., the degradable resin nano-composite material for oil and gas field operation. The composite material is prepared by adopting the method, can be prepared into sheets, powder, particles, spheres and the like, or can be prepared into sheets, powder, particles, spheres and the like by using mixture of one of polycaprolactone, polybutylenes succinate and polylactic acid and the inorganic nano-materials, is used for temporary plugging and filtration reduction to protect reservoirs and temporary plugging of blast holes and constructed layer sections and the like during various construction operations (drilling, well completion, well repair and acid fracturing) in oil and gas fields, and has the advantages of complete degradability and zero harm to formations.

Description

technical field [0001] The invention relates to a degradable resin nanocomposite material for oil and gas field operations and a preparation method thereof, belonging to the technical field of oil and gas exploitation. Background technique [0002] In various construction operations in oil and gas fields, such as drilling, well completion, and workover operations, fluid loss control materials are widely used to reduce the intrusion of working fluid into the reservoir and reduce its damage to the reservoir. The fluid loss control agent used can block the fractures and pores of the reservoir, thereby reducing the intrusion of working fluid, and plugging the pore throats and fractures of the reservoir. After the operation is completed, these plugging materials also block the flow of oil and gas from the reservoir. Flow into the wellbore and cause damage to the reservoir. Or in the acidizing process of oil and gas wells, for heterogeneous reservoirs, it is necessary to temporar...

Claims

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Application Information

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IPC IPC(8): C08L67/04C08L67/02C08K3/36D01F8/14
Inventor 周福建周志澎王旻周翠红左洁
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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