Oil and gas field fracturing fluid, oil and gas field well cementation agent and oil and gas field fracturing temporary plugging agent

A technology for oil and gas fields and fracturing fluids, which is applied in the directions of conjugated synthetic polymer artificial filaments, drilling compositions, chemical instruments and methods, etc. and other problems, to achieve good sand-carrying function, improve stability, and good alkali resistance.

Inactive Publication Date: 2017-10-24
CHINA PETROCHEMICAL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the above research on environmental protection and degradable materials for oil and gas fields is far from enough, let alone solve the problem that conventional PVA fibers are not resistant to high temperature and alkali in the field of oil and gas fields.

Method used

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  • Oil and gas field fracturing fluid, oil and gas field well cementation agent and oil and gas field fracturing temporary plugging agent
  • Oil and gas field fracturing fluid, oil and gas field well cementation agent and oil and gas field fracturing temporary plugging agent

Examples

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Comparison scheme
Effect test

Embodiment 1

[0051] Example 1: Mix guar gum, PVA fiber and other components to prepare an oil and gas field fracturing fluid with a viscosity of 100mPa·s at room temperature. Based on the prepared oil and gas field fracturing fluid, the concentration of guar gum accounts for 0.2wt %, PVA fiber concentration accounts for 1.2wt%. PVA fiber is prepared by spinning polyvinyl alcohol with a degree of polymerization of 2800 and a degree of alcoholysis of 99.5 (mol)%. The degree of hydroformylation η of the PVA fiber is 28%, its Rp=170°C, and the linear density of a single fiber is 1.3dtex , the elongation at break is 18%, the fiber slenderness ratio is 300, and the true density of the fiber is 0.98g / cm 3 , the tensile strength in 120 water is 8cN / dtex, the PVA fiber is kept in the alkaline solution of pH=10 for 12 hours, and the mass loss rate of the fiber is 0.3%.

Embodiment 2

[0052] Example 2: Mix guar gum, PVA fiber and other components to prepare an oil and gas field fracturing fluid with a viscosity of 150mPa·s at room temperature. Based on the prepared oil and gas field fracturing fluid, the concentration of guar gum accounts for 0.6wt %, PVA fiber concentration accounts for 0.8wt%. PVA fiber is prepared by spinning polyvinyl alcohol with a degree of polymerization of 1900 and an alcoholysis degree of 99.5 (mol). The degree of hydroformylation η of the PVA fiber is 30%, its Rp=175°C, and the linear density of a single fiber is 1.35dtex , the elongation at break is 22%, the fiber slenderness ratio is 450, and the true density of the fiber is 1.25g / cm 3 , the tensile strength in water at 150° C. is 12 cN / dtex, and the PVA fiber is kept in an alkaline solution with pH=10 for 12 hours, and the mass loss rate of the fiber is 0.3%.

Embodiment 3

[0053] Example 3: Mix guar gum, PVA fiber and other components to prepare an oil and gas field fracturing fluid with a viscosity of 120mPa·s at room temperature. Based on the prepared oil and gas field fracturing fluid, the concentration of guar gum accounts for 0.8wt %, PVA fiber concentration accounts for 1.2wt%. PVA fiber is prepared by spinning polyvinyl alcohol with a degree of polymerization of 1700 and a degree of alcoholysis of 98 (mol)%. The degree of hydroformylation of the PVA fiber η is 32%, its Rp=160°C, and the linear density of the single fiber is 1.65dtex , the elongation at break is 18%, the fiber slenderness ratio is 500, and the real density of the fiber is 1.29g / cm 3 , the tensile strength in water at 160° C. is 9 cN / dtex, and the PVA fiber is maintained in an alkaline solution with pH=10 for 12 hours, and the mass loss rate of the fiber is 0.3%.

[0054] In addition to the above-mentioned PVA fiber and hydroxypropyl guar gum, the above-mentioned oil and g...

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Abstract

The invention provides oil and gas field fracturing fluid, an oil and gas field well cementation agent and an oil and gas field fracturing temporary plugging agent, which contain PVA (Polyvinyl Alcohol) fibers. The PVA fibers are papered from polyvinyl alcohol with the polymerization degree of 1000 to 3000 and the alcoholysis degree of 80 mole percent to 99.5 mole percent through spinning; the hydroformylation degree eta of the PVA fibers is 25 percent to 35 percent and Rp is 120 DEG C to 180 DEG C. The PVA fibers have the monofilament density of 1.0dtex to 1.8dtex at normal temperature and have the elongation at break of 10 percent to 25 percent; the slenderness ratio of the fibers is 200 to 600 and the real density of the fibers is 0.8g/cm<3> to 1.4g/cm<3>. The yield increasing range of the oil and gas field can reach 30 percent to 50 percent; the strength and toughness of the well cementation agent are remarkably improved and the well cementation agent can also have an anti-leakage effect; when being used in the fractured oil and gas field, the oil and gas field fracturing temporary plugging agent aims at plugging old cracks and breaking new cracks; when the fracturing temporary plugging agent is used, the pressure is raised by 6MPA or above and the yield of the oil and gas field is improved by two times or above.

Description

technical field [0001] The invention relates to a PVA fiber and its application in preparing oil and gas field fracturing fluid, oil and gas field cementing agent and oil and gas field fracturing temporary plugging agent. Background technique [0002] my country's low-permeability oil and gas resources are huge, accounting for more than 70% of the total proven reserves, and are the main potential areas for increasing reserves and production in the future. This type of oil and gas resources has the characteristics of three lows, that is, low proven rate, low natural production rate, and low recovery rate. The practical application shows that in the exploitation of such oil and gas fields, there is an urgent need for well-functioning cementing agents, fracturing temporary plugging agents, and oil and gas field fracturing fluids that can play a good role in carrying sand. At the same time, it is necessary to minimize the damage to the environment . PVA (polyvinyl alcohol) fib...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68C09K8/467C09K8/512D01F8/10
CPCC09K8/685C09K8/467C09K8/512C09K8/602C09K8/882C09K8/887C09K8/90C09K2208/08C09K2208/12C09K2208/24C09K2208/26D01F8/10
Inventor 向鹏伟王华全周霖王建吴晓黎
Owner CHINA PETROCHEMICAL CORP
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