Oil-gas field fracturing fluid, oil-gas field well cementing agent and oil-gas field fracturing temporary plugging agent containing PVA (Polyvinyl alcohol) fiber

A technology for oil and gas fields and fracturing fluids, applied in the directions of reagents, drilling compositions, chemical instruments and methods, etc., can solve the problems of polyvinyl alcohol thickening, poor temperature resistance and shear resistance, etc., and achieve good The effect of reducing filter failure, small environmental damage, good temperature resistance and shear 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

CN201510406552.7, a cellulose blended modified polyvinyl alcohol fracturing fluid and its preparation method, discloses a cellulose blended modified polyvinyl alcohol fracturing fluid, which consists of 1-15 parts of polyvinyl alcohol, cellulose 1-15 parts, 1-10 parts of organic titanium crosslinking agent, 200-300 parts of water, but this invention cannot solve the problems of conventional polyvinyl alcohol's thickening property, poor temperature resistance and shear resistance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Example 1: An oil and gas field fracturing fluid, consisting of PVA fibers, guar gum, water and other substances, wherein the PVA fibers are prepared by spinning PVA with a degree of polymerization of 1800 and a degree of alcoholysis of 88.5 mol%. The water solution temperature is 20℃, the dissolution range is 3℃, the linear density is 3.5dtex, the dry breaking strength is 2.5 cN / dtex, the length is 12mm, the mass concentration of PVA fiber in the oil and gas field fracturing fluid is 0.8%, and the oil and gas field fracturing fluid is 25 The viscosity at °C was 60 mPa·s.

Embodiment 2

[0047] Embodiment 2: A kind of oil and gas field fracturing fluid is composed of PVA fiber, water and other substances, wherein the PVA fiber is prepared by spinning PVA with a degree of polymerization of 1500 and an alcoholysis degree of 85.5 mol%, and the water-soluble temperature of the PVA fiber is 30℃, the melting range is 8℃, the linear density is 20dtex, the dry breaking strength is 5.5 cN / dtex, the length is 8mm, the mass concentration of PVA fiber in oil and gas field fracturing fluid is 1.5%, and the viscosity of oil and gas field fracturing fluid at 25℃ is 90mPa·s.

Embodiment 3

[0048] Example 3: An oil and gas field fracturing fluid, consisting of PVA fibers, guar gum, water and other substances, wherein the PVA fibers are prepared from PVA with a degree of polymerization of 2400 and a degree of alcoholysis of 92.0 mol% by spinning. The water solution temperature is 50℃, the dissolution range is 10℃, the linear density is 8.5dtex, the dry breaking strength is 6.8cN / dtex, the length is 20mm, the mass concentration of PVA fiber in the oil and gas field fracturing fluid is 3.0%, and the oil and gas field fracturing fluid is 25 The viscosity at °C was 120 mPa·s.

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Abstract

The invention discloses an oil-gas field fracturing fluid, a temporary plugging agent and a well cementing agent containing a PVA (Polyvinyl alcohol) fiber. The PVA fiber is prepared by spinning PVA being 1000 to 3500 in polymerization degree, and 80 to 99.9 mole percent in alcoholysis degree. The oil-gas field fracturing fluid has the advantages of higher temperature resistance and shearing resistance, small environmental damage, low cost, environmental friendliness, very good sand carrying function and facilitation of fracturing fluid flowback; the oil-gas field well cementing agent can enhance the strength and the toughness of a well cementing material, can play a role in preventing leakage, is degradable and has low environmental damage; the oil-gas field fracturing temporary plugging agent has a good filtration reduction effect, forms a shielding layer at a position to be plugged temporarily to realize successful steering of the fracturing fluid, and is degradable; components left underground do not cause environmental pollution.

Description

technical field [0001] The invention relates to an oil and gas field fracturing fluid, an oil and gas field cementing agent, and an oil and gas field fracturing temporary plugging agent, in particular to an oil and gas field fracturing fluid, an oil and gas field cementing agent, and an oil and gas field fracturing temporary plugging agent containing PVA (polyvinyl alcohol) fibers agent. Background technique [0002] my country has a huge amount of low-permeability oil and gas resources, accounting for more than 70% of the total proven reserves. This kind of oil and gas resources has the characteristics of three lows, namely low proven rate, low natural production rate and low recovery rate. Practical applications show 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 working fluids such as oil and gas field fracturing fluids that can better carry sa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/62C09K8/50C09K8/44
CPCC09K8/44C09K8/50C09K8/62C09K2208/08Y02P20/141
Inventor 向鹏伟王华全周霖张振宇巫传英
Owner CHINA PETROCHEMICAL CORP
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