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Biological fracturing fluid system as well as preparation and application thereof

A fracturing fluid and system technology, which is applied in the direction of production fluids, drilling compositions, chemical instruments and methods, etc., can solve the problems of residual glue blocking pores, incomplete gel breaking, etc., achieve high flowback rate, improve inability to The effect of breaking the glue or not breaking the glue completely, and breaking the glue completely

Inactive Publication Date: 2017-06-27
DALIAN BITEOMICS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies of the existing gel-type water-based fracturing fluid system, such as incomplete gel breaking and easy generation of residual gel to block pores, the present invention provides a new type of biological fracturing fluid system suitable for unconventional oil and gas reservoirs

Method used

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  • Biological fracturing fluid system as well as preparation and application thereof
  • Biological fracturing fluid system as well as preparation and application thereof
  • Biological fracturing fluid system as well as preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The preparation of a new type of biological fracturing fluid system used in unconventional gas reservoirs is achieved in the following ways:

[0035] 1) Weigh 0.20 g of vegetable gum polymer (specifically hydroxypropyl guar gum) according to the weight ratio, and add 100 mL of water at a constant speed under high-speed stirring to prepare a guar gum base liquid.

[0036] 2) Add biological fungicide (specifically bacitracin) 0.02g, biological drainage aid (specifically surfactin) 0.025g, clay stabilizer (specifically KCl) 2g, biological enzyme breaker (specifically β-mannan) Enzyme) 30mg / L.

[0037] 3) Add a pH regulator to adjust the pH to 8.5-9.5.

[0038] 4) Adding a cross-linking agent for cross-linking, the cross-linking agent is a 1.5 wt% borax aqueous solution, the added amount is 5 mL, while gently stirring, the jelly used for fracturing can be obtained.

Embodiment 2

[0040] The preparation of a new type of biological fracturing fluid system used in unconventional gas reservoirs is achieved in the following ways:

[0041] 1) Weigh 0.20 g of vegetable gum polymer (specifically hydroxypropyl guar gum) according to the weight ratio, and add 100 mL of water at a constant speed under high-speed stirring to prepare a guar gum base liquid.

[0042] 2) Add biological fungicide (specifically polymyxin) 0.02g, biological drainage aid (specifically surfactin) 0.025g, clay stabilizer (specifically KCl) 2g, biological enzyme breaker (specifically β-mannan) Glycanase) 30mg / L.

[0043] 3) Add a pH regulator to adjust the pH to 8.5-9.5.

[0044] 4) Adding a cross-linking agent for cross-linking, the cross-linking agent is a 1.5 wt% borax aqueous solution, the added amount is 5 mL, while gently stirring, the jelly used for fracturing can be obtained.

Embodiment 3

[0046] The preparation of a new type of biological fracturing fluid system used in unconventional gas reservoirs is achieved in the following ways:

[0047] 1) Weigh 0.20 g of vegetable gum polymer (specifically carboxymethyl hydroxypropyl guar gum) according to the weight ratio, and add 100 mL of water at a constant speed under high-speed stirring to prepare a guar gum base liquid.

[0048] 2) Add biological fungicide (specifically polymyxin) 0.02g, biological drainage aid (specifically rhamnolipid) 0.003g, clay stabilizer (specifically KCl) 2g, biological enzyme breaker (specifically β-mannanase) 30mg / L.

[0049] 3) Add a pH regulator to adjust the pH to 8.5-9.5.

[0050] 4) Adding a cross-linking agent for cross-linking, the cross-linking agent is a 1.5 wt% borax aqueous solution, the added amount is 5 mL, while gently stirring, the jelly used for fracturing can be obtained.

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Abstract

The invention relates to a biological fracturing fluid system and particularly relates to a novel biological fracturing fluid system applicable to exploitation of unconventional gas reservoirs. The biological fracturing fluid system contains the following components by weight: 2g / L-4g / L of a gelatin polymer, 0.02g / L-2g / L of a biological bactericide, 0.25g / L-0.5g / L of a biological discharging aid, 10g / L-30g / L of a clay stabilizing agent, a pH value regulator, 10mg / L-30mg / L of an enzyme gel breaker and the balance of water. The biological fracturing fluid system can furthest exert the advantages of fracture formability and filtrate loss resistance of gelled fracturing fluid corresponding to the unconventional gas reservoirs such as coal bed gas, shale gas and tight sandstone gas, and biological enzyme is taken as a gel breaker, so that the jelled gel is thoroughly broken, the residue amount is extremely low, nature or fractured pores of the reservoirs are not blocked, the fracture construction effect is guaranteed, the effective flowback is realized, the damage of a stratum is reduced, and the productivity of an unconventional gas well is improved; the biological fracturing fluid system is a relatively ideal novel fracturing fluid system applicable to the exploitation of the unconventional gas reservoirs.

Description

Technical field [0001] The invention relates to the field of product development related to hydraulic fracturing oil and gas reservoir reconstruction technology, in particular to a novel biological fracturing fluid system suitable for the exploitation of unconventional gas reservoirs and its preparation. Background technique [0002] Hydraulic fracturing technology is an effective method to increase production in the exploitation of low-permeability oil and gas layers. Its main mechanism for fracturing and increasing production in unconventional gas reservoirs such as coalbed methane, shale gas, tight sandstone gas, etc.: drive water flow through high pressure to squeeze into the original and post-fracturing fractures, widen and extend These fractures in turn generate more secondary fractures and fissures in the reservoir, increasing the permeability of the reservoir. The output after fracturing can be increased by 5-20 times compared with that before fracturing, and the effect ...

Claims

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Application Information

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IPC IPC(8): C09K8/68E21B43/26
CPCC09K8/685C09K8/90C09K8/905C09K2208/24E21B43/26
Inventor 梅晓丹王平马雯雯强新新刘美娜
Owner DALIAN BITEOMICS INC
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