Composition containing polyglycolic acid and application of composition

A technology of polyglycolic acid and composition, which is applied in the direction of drilling composition, chemical instruments and methods, etc., and can solve problems such as failure, weakened plugging strength, and inability to soften the bond

Active Publication Date: 2020-10-09
PUJING CHEM IND SHA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] The common situation of the above-mentioned temporary plugging agents in the prior art is that most of the temporary plugging agents are rigid at a certain temperature and in a short period of time, but cannot be softened and bonded in a short period of time to form a low-permeability temporary plugging layer with a pressure-bearing effect ;In addition, as time goes on, the temporary plugging agent will slowly dissolve or degrade (for example, within 2-12 hours), making the plugging strength gradually weakened, or even invalid

Method used

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  • Composition containing polyglycolic acid and application of composition
  • Composition containing polyglycolic acid and application of composition
  • Composition containing polyglycolic acid and application of composition

Examples

Experimental program
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Effect test

Embodiment 1

[0110] The composition containing polyglycolic acid in this embodiment comprises i) polyglycolic acid and ii) a functional thickener mixed with polyglycolic acid and a degradation regulator, wherein the amount of polyglycolic acid is 100 parts by weight, and the functional thickener The consumption of is 12 parts by weight, and the consumption of degradation modifier is 3 parts by weight.

[0111] The polyglycolic acid used in this embodiment is a homopolymer of glycolic acid, and its shape is granular, and its degradation test can adopt the following steps:

[0112] Step I): Weigh 2 parts of mass and both are M 0 Polyglycolic acid, and placed in a constant temperature drying oven, dried at 60 ° C for 48 hours;

[0113] Step II): Put the dried 2 parts of polyglycolic acid into hard glass tubes with one end open respectively, and then add appropriate amount of water to completely soak the polyglycolic acid, and then put the hard glass tubes into the hard glass tubes with clean...

Embodiment 2

[0135] The composition containing polyglycolic acid in this embodiment comprises i) polyglycolic acid and ii) a functional thickener mixed with polyglycolic acid and a degradation regulator, wherein the amount of polyglycolic acid is 100 parts by weight, and the functional thickener The consumption of is 18 parts by weight, and the consumption of degradation regulator is 2 parts by weight.

[0136] The polyglycolic acid used in this embodiment is a glycolic acid-lactic acid copolymer, wherein the mass content of glycolic acid repeating units is about 56%.

[0137] The polyglycolic acid used in this example is fibrous, and the degradability of polyglycolic acid can be measured by the same method as that used in Example 1 for testing the degradability of polyglycolic acid.

[0138] It was measured that the degradation rate of the polyglycolic acid used in this example was less than 20% in 100°C water within 2 hours, and greater than 90% in 150°C water after 15 days.

[0139] Th...

Embodiment 3

[0147] The composition containing polyglycolic acid in this embodiment comprises i) polyglycolic acid and ii) a functional thickener mixed with polyglycolic acid and a degradation regulator, wherein the amount of polyglycolic acid is 100 parts by weight, and the functional thickener The consumption of is 20 parts by weight, and the consumption of degradation modifier is 6 parts by weight.

[0148] The polyglycolic acid used in this example is a homopolymer of glycolic acid, which is in the form of flakes. The degradability of polyglycolic acid can be measured by the same method as that used in Example 1 for testing the degradability of polyglycolic acid.

[0149] It was measured that the degradation rate of the polyglycolic acid used in this example was less than 20% in 100°C water within 2 hours, and greater than 90% in 150°C water after 15 days.

[0150] The functional thickener used in this example contains the following components in mass percent: 59.85% xanthan gum, 35% p...

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Abstract

The invention discloses a composition containing polyglycolic acid and an application of the composition. The composition is prepared from the following raw materials: polyglycolic acid, a functionalthickener and a degradation regulator, wherein the polyglycolic acid is a homopolymer of glycolic acid or / and a copolymer taking glycolic acid as a main repeating unit. The composition can be used forfracturing modification of oil and gas fields.

Description

technical field [0001] The invention belongs to the fields of petroleum engineering and chemical industry, and relates to a composition containing polyglycolic acid and its application in oil and gas field fracturing reconstruction. Background technique [0002] my country's low-permeability oilfields are rich in petroleum geological reserves, and their resources account for about 30% of the country's total petroleum resources. Among the proven reserves, low-permeability oil reservoirs account for more than two-thirds of the country's reserves, and the development potential is huge. However, in recent years, for heterogeneous low-permeability reservoirs characterized by relatively dispersed vertical distribution, many oil layers, and severe vertical heterogeneity, balanced stimulation cannot be achieved by multi-layer general fracturing. In order to replace the traditional multi-layer general fracturing technology to a certain extent, more and more scientific researchers hav...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68C09K8/90C09K8/88C09K8/514
CPCC09K8/68C09K8/905C09K8/885C09K8/514C09K8/5086
Inventor 谭磊纪海霞毛彦鹏
Owner PUJING CHEM IND SHA
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