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Completely degradable temporary plug for oil-gas well fracturing and preparation method thereof

A technology for oil and gas wells and oleic acid amide, which is used in earth-moving drilling, rayon manufacturing, wellbore/well components, etc., which can solve the problems of operation cost and time waste, slow glue breaking, and difficulty in breaking glue, and reduce costs. and working time, high flexural and tensile strength, improved aging and yield

Pending Publication Date: 2020-11-27
山东科兴化工有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of drillable (or dissolvable) bridge plugs has caused a lot of operating costs and time wasted. During the drilling process, the casing is often damaged due to poor control of the drill tool
[0003] At present, the most widely used temporary plugging materials in major oil and gas fields in China are polylactic acid particles and temporary plugging balls. Among them, polylactic acid particles have good temporary plugging effect, but there is a phenomenon that the gel breaking is slow or even difficult, and the flowback is not complete , will cause a certain degree of damage to the formation; the temporary plugging ball has the characteristics of high plugging strength and small deformation, but the disadvantage is that it is easy to fall off and the temporary plugging effect is poor. making it difficult to remove
The above-mentioned temporary plugging agents cannot effectively seal the fractures during the fracturing process, and cannot effectively break the gel and flow back, causing permanent damage to the reservoir

Method used

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  • Completely degradable temporary plug for oil-gas well fracturing and preparation method thereof
  • Completely degradable temporary plug for oil-gas well fracturing and preparation method thereof
  • Completely degradable temporary plug for oil-gas well fracturing and preparation method thereof

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preparation example Construction

[0043] The preparation method and characteristics of the present invention are described below, and the examples given are only used to explain the present invention, and are not used to limit the scope of the present invention.

[0044] A completely degradable temporary plug for oil and gas well fracturing, which includes the following components by weight:

[0045] Polyglycolic acid 80.0-100.0

[0046] Poly(L-lactide-ε-caprolactone) 2.0-6.0

[0047] Polycaprolactone 30.0-50.0

[0048] Silica 0.5-2.0

[0049] Toughener 1.0-10.0

[0050] Water blocking agent 1.0-10.0

[0051] Oleamide 0.1-1.0

[0052]Starch 10.0-30.0

[0053] Chitosan 1.0-5.0

[0054] Each component is not specifically stated, and the specific selection is as follows according to the selection of conventional commercially available products:

[0055] The polyglycolic acid is particles with an average particle size of 1-5mm, a melting point of 180-250°C, a weight-average molecular weight of 40,000-120,0...

Embodiment 8

[0078] The polyglycolic acid (high molecular weight) in Examples 1-7 was replaced with low molecular weight polyglycolic acid, and other components and processes were unchanged, and the degradable temporary blockage obtained was basically equivalent to other indicators of the above-mentioned examples. , but the number of days of complete degradation is reduced to 6-8 days.

[0079] According to the above table, it can be seen that the comparison example uses polyglycolic acid as raw material (without adding other components of the present invention) to directly adopt the five-step process of melting-spinning-weaving-cutting-drying to obtain the finished product, and its technical indicators are especially compressive strength. Obviously lower than other embodiments, wherein the technical effect of embodiment 4 is the best. In each embodiment of the present invention, the compressive strength of the completely degradable temporary blockage exceeds 70MPa, and by controlling the ...

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Abstract

The invention relates to the field of fracturing engineering in the oil and gas field development process, and particularly discloses a completely degradable temporary plug for oil-gas well fracturingand a preparation method thereof. The completely degradable temporary plug is prepared from polyglycolic acid, poly (L-lactide-epsilon-caprolactone), polycaprolactone, silicon dioxide, a flexibilizer, a water-blocking agent, oleamide, starch, chitosan and other materials; the completely degradable material is decomposed into carbon dioxide and water, and the degradation speed can be adjusted according to the temperature of a fracturing interval and required time, so that the applicability of temporary plugging is improved; a finished product is directly obtained by adopting a five-step process of melting, spinning, weaving, cutting and drying, so that industrial production is facilitated; compared with the existing polylactic acid temporary plugging particles and temporary plugging balls,the completely degradable temporary plugging has the advantages that the process is simple, the fracturing cost is effectively reduced, the temporary plugging pressure-bearing strength is greatly enhanced, the fracturing effect is improved, and the yield after fracturing measures is greatly increased.

Description

technical field [0001] The invention relates to the field of fracturing engineering in the process of oil and gas field development, and specifically discloses a completely degradable temporary plug for oil and gas well fracturing and a preparation method thereof. Background technique [0002] With the development of oilfields at home and abroad, fracturing as a main completion measure has been applied more and more. In recent years, for low-permeability and ultra-low-permeability oil and gas layers, in order to further increase production, a large number of horizontal wells have been developed, and the staged fracturing completion technology has been proposed. It uses pumping perforation in the hydraulic fracturing process. The process of setting drillable (or dissolvable) bridge plugs together and fracturing stage by stage. The use of drillable (or dissolvable) bridge plugs has resulted in a lot of operating costs and wasted time. During the drilling process, the casing i...

Claims

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Application Information

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IPC IPC(8): E21B33/12E21B43/26D01F8/14D01F1/10
CPCD01F1/10D01F8/14E21B33/12E21B43/261
Inventor 李振华崔长海卡杰特·瓦列里·弗拉基米尔维奇李宇超杨建峰
Owner 山东科兴化工有限责任公司
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