Biodegradable resin material applied to oil and gas fields and preparation method for biodegradable resin material

A technology for degrading resins, oil and gas fields, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of insufficient water production, formation damage, long contact time, etc.

Inactive Publication Date: 2015-10-21
CHINA UNIV OF PETROLEUM (BEIJING) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 materials, after completing the temporary plugging operation, need to inject acid to dissolve the temporary plugging materials and remove them. Clogging is not suitable for acid-sensitive reservoirs, even for non-acid-sensitive reservoirs, an additional operation is required, which increases operating costs. Since the acid solution cannot fully soak all the temporary blocking materials, it cannot be completely dissolved. Unblock the oil and gas channels; for oil-soluble temporary plugging materials, first of all, it is not suitable for gas wells, and second, it is oil wells. Since the formation crude oil only contacts the front edge of temporary plugging, when the dissolution reaches saturation, it is mainly achieved by diffusion and convection. Slow dissolution, which leads to long and insufficient contact time, and some damage to the formation

Method used

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  • Biodegradable resin material applied to oil and gas fields and preparation method for biodegradable resin material
  • Biodegradable resin material applied to oil and gas fields and preparation method for biodegradable resin material

Examples

Experimental program
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Embodiment 1

[0041] This embodiment provides a degradable resin material applied to oil and gas fields, such as figure 1 As shown, it is prepared by the following steps:

[0042] (1) Stir and dry polycaprolactone slices with a weight average molecular weight (Mw) of 80,000 at 50-55°C and a vacuum of 90 kPa for 12 hours; The acetic acid slices were stirred and dried for 4 hours at 100-105°C and a vacuum of 90 kPa; hours, make its moisture content lower than 0.1wt%, the best lower than 0.01wt%;

[0043] (2) Take 100 kilograms of polycaprolactone slices, 750 kilograms of polyglycolic acid slices and 150 kilograms of polylactic acid slices after removing water and add them to a stainless steel mixer with a stirring device, heat up to 50 ° C, and At a temperature of 90 kPa, mix for 10 minutes;

[0044] (3) Add the mixture of polyglycolic acid, polycaprolactone and polylactic acid in the mixer to the reciprocating single-screw mixing extruder, add 3.5 kilograms of silicon dioxide with a parti...

Embodiment 2

[0049] The PGA / PCL / PLA resin nano-alloy slices prepared in Example 1 are granulated through a screw granulator at 200°C, the particle diameter is Φ1-1.5 mm, and the temperature is dropped to At 20°C, molded Φ1-1.5 mm particles are obtained, and a granular degradable resin material is obtained.

[0050] The Φ1-1.5 mm granular degradable resin material is used in Well C1 (in the well depth of 6513-6572m, the temperature of this well section is 152°C-153°C, two layers are opened, 6513-6524m and 6561-6572m) well temporarily For plugging and diverting fracturing operations, use guar gum jelly fracturing fluid to carry, and divide into one temporary plugging and diverting fracturing, use the Φ1-1.5 mm particle temporary plugging material 268 kg, after diverting, under the same pump injection displacement, the pressure rises The height is 15.2MPa, and the diversion effect of temporary plugging is obvious. The granular temporary plugging material is completely degraded at 150°C for 12...

Embodiment 3

[0052] This embodiment provides a degradable resin material applied to oil and gas fields, such as figure 1 As shown, it is prepared by the following steps:

[0053] (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 11 hours; The acetic acid slices were stirred and dried for 4 hours at 95-100°C and a vacuum of 90 kPa; the moisture content was lower than 0.1wt%, preferably lower than 0.01wt%;

[0054] (2) Get 500 kilograms of polycaprolactone slices and 500 kilograms of polyglycolic acid slices after the above water removal and add them to a stainless steel mixer with a stirring device, heat up to 45 ° C, and under a vacuum of 90 kPa, Mix for 10 minutes;

[0055] (3) Add the mixture of polyglycolic acid and polycaprolactone in the mixer to the reciprocating single-screw mixing extruder, add 5 kg of silicon dioxide with a particle diameter of 10-20nm, and add 1.3 kg The chain extender ADR-4300 p...

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Abstract

The invention provides a biodegradable resin material applied to oil and gas fields and a preparation method for the biodegradable resin material. According to the preparation method for the biodegradable resin material applied to the oil and gas fields, two or three polymers of polyglycolic-colactic acid, polycaprolactone and polylactic acid and a chain extender are subject to melt mixing reaction to obtain a resin alloy, namely the biodegradable resin material applied to the oil and gas fields. The biodegradable resin material applied to the oil and gas fields is prepared from the method, can be prepared into the shapes of sheets, powder, granules, spheres and the like, or can be prepared into the shapes of the sheets, the powder, the granules, the spheres and the like by one of the polyglycolic-colactic acid, the polycaprolactone and the polylactic acid, is used for temporarily blocking filtrate to protect a reservoir, temporarily blocking a blast hole, a constructed layer section and the like in various construction (well drilling, well completing, well repairing, and acidizing and fracturing) operations of the oil and gas fields, and has the advantages of complete degradation and zero damage to stratum.

Description

technical field [0001] The invention relates to a degradable resin material used in oil and gas fields and a preparation method thereof, belonging to the technical field of oil and gas exploitation. Background technique [0002] In various construction operations of oil and gas wells, such as drilling, well completion, well workover or stimulation 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. [0003] In order to reduce the damage caused by the fluid loss control agent to the reservoir, temporary pluggi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08K3/36C08K3/22C09K8/508
Inventor 周福建周翠红王旻周志澎左洁
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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