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Slick water for tight sandstone reservoir, and preparation method thereof

A technology for slick water and drainage aids, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of large formation damage, poor salt resistance, and high construction friction, and achieve low formation damage and reservoir formation. Small damage, damage reduction effect

Active Publication Date: 2020-06-02
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the commonly used slippery water has the following problems: high construction friction, great damage to the formation, poor salt resistance, poor compatibility, and high cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] This embodiment provides slick water 1#, which is composed of: by mass percentage, drag reducing agent 1# 0.08%, drainage aid 1# 0.2%, potassium chloride 0.3%, formaldehyde 0.02%, and the balance is water.

[0037] Wherein the drag reducing agent 1# is obtained by fully reacting sodium lignosulfonate, acrylamide and potassium persulfate in an aqueous solution, and the mass concentration of sodium lignosulfonate in the aqueous solution is 2%, and the mass concentration of acrylamide is 8%. The mass concentration of potassium persulfate is 0.005%. The specific preparation process is as follows: Weigh the required sodium lignosulfonate and water, put them into a flask, and stir at 60°C for 10 minutes to form a homogeneous solution; add potassium persulfate and acrylamide to the homogeneous solution, and stir at 60°C The crude polymer product was obtained in 3 hours; the polymer was separated from the crude polymer product with absolute ethanol; the separated polymer was ce...

Embodiment 2

[0046] This embodiment provides slick water 2#, the specific composition is: by mass percentage, drag reducing agent 2# 0.1%, drainage aid 2# 0.15%, ammonium chloride 0.4%, acrolein 0.1%, and the balance is water .

[0047] Wherein drag reducing agent 2# is obtained by fully reacting sodium lignosulfonate, acrylamide and potassium persulfate in aqueous solution, the mass concentration of sodium lignosulfonate in aqueous solution is 2.5%, the mass concentration of acrylamide is 8.5%, The mass concentration of potassium persulfate is 0.006%. The specific preparation process is as follows: Weigh the required sodium lignosulfonate and water, put them into a flask, and stir at 50°C for 15 minutes to form a homogeneous solution; then add potassium persulfate and acrylamide to the homogeneous solution, Stir for 4 hours to obtain a crude polymer product; separate the polymer from the crude polymer product with absolute ethanol; centrifuge and wash the separated polymer for 3 times, a...

Embodiment 3

[0055] This embodiment provides slick water 3#, the specific composition is: by mass percentage, drag reducing agent 3# 0.06%, drainage aid 3# 0.18%, potassium chloride 0.2%, acrolein 0.15%, and the balance is water .

[0056] Among them, the drag reducing agent 3# is obtained by fully reacting sodium lignosulfonate, acrylamide and potassium persulfate in an aqueous solution. The mass concentration of sodium lignosulfonate in the aqueous solution is 2.2%, and the mass concentration of acrylamide is 9.4%. The mass concentration of potassium persulfate is 0.006%. The specific preparation process is as follows: Weigh the required sodium lignosulfonate and water, put them into a flask, and stir at 40°C for 20 minutes to form a homogeneous solution; then add potassium persulfate and acrylamide to the homogeneous solution, Stir for 5 hours to obtain a crude polymer product; use absolute ethanol to separate the polymer from the crude polymer product; centrifuge and wash the separate...

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Abstract

The invention provides slick water for a tight sandstone reservoir, and a preparation method of the slick water. The slick water is prepared from the following components in percentage by mass: 0.05-0.15% of a resistance reducing agent, 0.05-0.3% of a cleanup additive, 0.05-0.5% of an anti-swelling agent, 0.01-0.5% of a bactericide and the balance of water, wherein the resistance reducing agent isa grafted copolymer of lignosulfonate and acrylamide, the cleanup additive is a microemulsion cleanup additive, the anti-swelling agent is potassium chloride or / and ammonium chloride, and the bactericide is formaldehyde or / and acrolein. According to the invention, based on the resistance reducing agent, the anti-swelling agent and the bactericide are considered in combination with selection of the cleanup additive, the proportions of all the components of the slick water are readjusted, the brand-new slick water suitable for the tight sandstone reservoir is developed, the drag reduction rateof the slick water exceeds 70%, damage to the reservoir is small, flowback is easy, compatibility is good, corrosion is not likely to happen, the preparation process is simple, and cost is low.

Description

technical field [0001] The invention relates to the technical field of fracturing fluids used in oil development, in particular to slick water for tight sandstone reservoirs and a preparation method thereof. Background technique [0002] As one of the unconventional oil and gas resources, tight oil and gas are widely distributed and have great potential. In recent years, with the breakthrough of shale gas horizontal well volume fracturing technology, tight oil and gas has become a realistic replacement field, and exploration and development activities have become increasingly active and developed rapidly. In the process of tight oil and gas fracturing, the damage of fracturing fluid to the reservoir cannot be ignored. It is generally believed that the slick water fracturing fluid has the advantages of low damage rate to the reservoir and artificial fractures, low cost, and low operation intensity. At the same time, its low viscosity is conducive to the formation of complex ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68
CPCC09K8/68C09K8/90C09K8/882C09K8/602
Inventor 苏建郭琳曾双红李霞张晨曦赵烨李玉印周坤关伟田浩
Owner PETROCHINA CO LTD
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