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Degradable material for oil and gas field operation and preparation method thereof

A technology for degradable materials and oil and gas fields, applied in the field of degradable materials and their preparation, which can solve the problems of inability to dissolve, high safety risk, slow dissolution, etc.

Inactive Publication Date: 2016-02-03
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 use non-water-based working fluids, such as organic hydrocarbons, which increases operating costs, and safety risks such as fire prevention during on-site construction are also relatively large. After completion, there needs to be a sufficient amount of water in the formation. During the subsequent liquid drainage process, the produced water in the formation will dissolve it, remove its temporary blockage, and dredge the oil and gas channels. If there is not enough water in the formation, or the formation pressure is insufficient, there will be no Sufficient water production requires subsequent injection of water into the formation to dissolve these water-soluble temporary plugging materials, which often cannot be completely dissolved, causing certain damage to the formation
Acid-soluble temporary plugging materials, after completing the temporary plugging operation function, need to inject acid solution to acid-dissolve the temporary plugging materials to remove their plugging, which is not suitable for acid-sensitive reservoirs, even for non-acid-sensitive reservoirs. One more operation will increase the operating cost. Since the acid solution cannot fully soak all the temporary blocking materials, it cannot completely dissolve them and unblock the oil and gas passages; in addition, during the subsequent acidizing treatment, the acid solution will also affect the The pipe string brings corrosion and causes certain damage to the pipe string
For oil-soluble temporary plugging materials, first of all, it is not suitable for gas wells, and secondly, it is oil wells. Since the formation crude oil only contacts the front edge of temporary plugging, when the dissolution reaches saturation, it mainly relies on diffusion and convection to achieve slow dissolution, which leads to contact time. Long and insufficient, there is a certain damage to the formation

Method used

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  • Degradable material for oil and gas field operation and preparation method thereof
  • Degradable material for oil and gas field operation and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0090] This embodiment provides a degradable material for oil and gas field operations, such as figure 1 As shown, it is prepared by the following steps:

[0091] (1) Stir and dry polycaprolactone chips with a weight average molecular weight (Mw) of 90,000 at 50-55°C and a vacuum of 90 kPa for 13 hours; Acetic acid slices were stirred and dried for 4 hours at 100-105 ° C and a vacuum of 90 kPa; polylactic acid slices with a weight average molecular weight (Mw) of 100,000 were stirred and dried at 90-95 ° C and a vacuum of 90 kPa for 6.0 hours; the weight average molecular weight (Mw) is 50,000 polybutylene butyrate at 70-75 ° C, vacuum 90 kPa, stirred and dried for 9.0 hours; the weight average molecular weight (Mw) is 60,000 polybutylene - 3-hydroxybutyrate was stirred and dried for 4.0 hours at 100-105°C and a vacuum of 90 kPa; the moisture content was lower than 0.1wt%, preferably lower than 0.01wt%;

[0092] (2) Get 150 kilograms of polycaprolactone slices, 300 kilograms...

Embodiment 2

[0098] This embodiment provides a degradable material for oil and gas field operations, such as figure 1 As shown, it is prepared by the following steps:

[0099] (1) Stir and dry polycaprolactone chips with a weight average molecular weight (Mw) of 30,000 at 50-55°C and a vacuum of 90 kPa for 11 hours; Acetic acid slices were stirred and dried for 4 hours at 100-105°C and a vacuum of 90 kPa; , stirred and dried for 9.0 hours; poly-3-hydroxybutyrate with a weight average molecular weight (Mw) of 40,000 was stirred and dried for 4.0 hours at 100-105°C and a vacuum of 90 kPa; the moisture content was lower than 0.1 wt%, preferably less than 0.01wt%;

[0100] (2) Get 280 kilograms of polycaprolactone slices, 320 kilograms of polyglycolic acid slices, 250 kilograms of polybutylene butyrate lactone slices and 150 kilograms of poly-3-hydroxybutyrate slices after the above-mentioned dehydration is added to In a stainless steel mixer with a stirring device, heat up to 50°C, and mix...

Embodiment 3

[0106] This embodiment provides a degradable material for oil and gas field operations, such as figure 1 As shown, it is prepared by the following steps:

[0107] (1) Stir and dry polyglycolic acid slices with a weight average molecular weight (Mw) of 60,000 at 90-100°C and a vacuum of 90 kPa for 4 hours; Butylene glycol ester slices were stirred and dried for 9 hours at 70-75°C and a vacuum of 90 kPa; poly-3-hydroxybutyrate slices with a weight average molecular weight (Mw) of 50,000 were placed at Under the vacuum degree of 90 kPa, stir and dry for 4 hours, so that the moisture content is lower than 0.1wt%, preferably lower than 0.01wt%;

[0108] (2) Take 100 kilograms of polyglycolic acid slices, 500 kilograms of polybutylene succinate slices and 400 kilograms of poly-3-hydroxybutyrate slices after dewatering and add them to a stainless steel mixer with stirring device , heat up to 50°C, and mix for 10 minutes at a vacuum of 90 kPa;

[0109] (3) Add the mixture of polygl...

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Abstract

The invention provides a degradable material for oil and gas field operation and a preparation method thereof. The preparation method of the degradable material for oil and gas field operation comprises the step of carrying out melting mixing reaction on two, three, four, or five polymers of polyglycolic acid, polycaprolactone, polylactic acid, poly butylene succinate and poly-3-hydroxybutyrate and a chain extender, so as to obtain resin alloy, namely, the degradable material for oil and gas field operation. The degradable material for oil and gas field operation can be prepared into shapes such as pieces, powder, particles and balls, or can be prepared from one of polyglycolic acid, polycaprolactone, polylactic acid, poly butylenes succinate and poly-3-hydroxybutyrate into shapes such as pieces, powder, particles and balls through the method, is used for temporary plug and filtration reduction for protecting a reservoir, and temporarily plugging shot holes, constructed layer sections, and the like during various operation (drilling, well completion, well repair and acid fracturing) in the oil and gas field, and has the advantages of being completely degradable and harmless to the stratum.

Description

technical field [0001] The invention relates to a degradable 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, well workover or stimulation (acidizing and fracturing) operations, fluid loss control materials are widely used to reduce the invasion of operating fluids into the reservoir and reduce its impact on the reservoir. harm. Use fluid loss control agents to seal the pore throats and fractures that invade the reservoir to reduce the invasion of working fluid into the reservoir; in the acidizing and fracturing operation of long well section multi-layer and long horizontal well section, it is necessary to uniformly acidize the whole well section, or For layered and staged fracturing, the most commonly used and economical technologies are temporary plugging acidific...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L67/02C08K3/36C08K3/22
CPCD01F1/10C08J3/203C09K8/426C08J3/12C08J3/005D01F6/92B29C45/0001B29C39/003B29C39/42E21B33/138C08J2367/04C08J2367/02D10B2331/041D10B2401/04C09K2208/08B29K2067/00B29K2995/006B29B9/06B29K2067/043B29K2067/046E21B43/27
Inventor 周福建周志澎王旻左洁周翠红
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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