Recyclable fracturing fluid used for fracturing construction of sandstone gas reservoir

A fracturing fluid and sandstone gas technology, which is applied in the field of recyclable fracturing fluid, can solve the problems of affecting the stimulation effect, high fracturing operation cost, and high residue in the system, so as to achieve good sand-carrying ability and reduce construction operation cost , Facilitate the effect of viscosity adjustment

Active Publication Date: 2014-03-12
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, at present, the hydroxypropyl guar gum fracturing fluid system is often used in the vertical well fracturing of low permeability gas wells / horizontal well staged fracturing. High, there is formation pollution, which affects the effect of production stimulation; fracturing flowback fluid enters the mud pool, which can easily cause surface environmental pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A recyclable fracturing fluid used for fracturing construction in sandstone gas reservoirs, the primary fracturing fluid consists of the following components by weight percentage:

[0022] Thickener 1%,

[0023] Potassium chloride 1%,

[0024] The balance is water.

[0025] In this embodiment, the viscosity of the primary fracturing fluid is at least 90 mPa·s when the ground temperature is normal, and the viscosity decreases rapidly when the formation temperature is greater than 60°C, and the viscosity is ≤10mPa·s at 100°C.

[0026] In this embodiment, after the flowback of the fracturing fluid, the flowback fluid is treated on the ground to form a secondary fracturing fluid. The secondary fracturing fluid includes a thickener for adjusting the viscosity of the liquid. The viscosity of the secondary fracturing fluid is At least 90mPa·s.

[0027] In this embodiment, the flowback fluid enters the fluid storage tank after desanding on the ground and gas-liquid separatio...

Embodiment 2

[0030] A recyclable fracturing fluid used for fracturing construction in sandstone gas reservoirs, the primary fracturing fluid consists of the following components by weight percentage:

[0031] Thickener 5%,

[0032] Potassium chloride 5%,

[0033] The balance is water.

[0034] In this embodiment, the viscosity of the primary fracturing fluid is at least 90 mPa·s when the ground temperature is normal, and the viscosity decreases rapidly when the formation temperature is greater than 60°C, and the viscosity is ≤10mPa·s at 100°C.

[0035] In this embodiment, after the flowback of the fracturing fluid, the flowback fluid is treated on the ground to form a secondary fracturing fluid. The secondary fracturing fluid includes a thickener for adjusting the viscosity of the liquid. The viscosity of the secondary fracturing fluid is At least 90mPa·s.

[0036] In this embodiment, the flowback fluid enters the fluid storage tank after desanding on the ground and gas-liquid separatio...

Embodiment 3

[0039] A recyclable fracturing fluid used for fracturing construction in sandstone gas reservoirs, the primary fracturing fluid consists of the following components by weight percentage:

[0040] Thickener 2%,

[0041] Potassium chloride 2%,

[0042] The balance is water.

[0043] In this embodiment, the viscosity of the primary fracturing fluid is at least 90 mPa·s when the ground temperature is normal, and the viscosity decreases rapidly when the formation temperature is greater than 60°C, and the viscosity is ≤10mPa·s at 100°C.

[0044] In this embodiment, after the flowback of the fracturing fluid, the flowback fluid is treated on the ground to form a secondary fracturing fluid. The secondary fracturing fluid includes a thickener for adjusting the viscosity of the liquid. The viscosity of the secondary fracturing fluid is At least 90mPa·s.

[0045] In this embodiment, the flowback fluid enters the fluid storage tank after desanding on the ground and gas-liquid separatio...

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Abstract

The invention discloses a recyclable fracturing fluid used for fracturing construction of a sandstone gas reservoir. A primary fracturing fluid comprises the following components in weight percent: 1% to 5% of chloridization stearic acid dimethylamino alcohol ester methyl ammonium, 1% to 5% of potassium chloride and the balance of water. The recyclable fracturing fluid has the advantages of leak-off of the fracturing fluid can be lowered, the pollution to the stratum can be reduced, and flowback liquid is reclaimed on the ground directly, so that earth surface pollution can be avoided; the flowback liquid is reclaimed, so that the water consumption can be lowered; the flowback liquid can be reused after being subjected to ground treatment.

Description

technical field [0001] The invention relates to a recyclable fracturing fluid used for fracturing construction of sandstone gas reservoirs, which is mainly used in gas well single well or cluster well group fracturing fluid recycling stimulation operation. Background technique [0002] For low-permeability natural gas wells, fracturing stimulation is an effective method and means to obtain industrial production capacity. The proppant carried by fracturing fluid is placed inside artificial fractures to expand the drainage area, thereby achieving gas well stimulation. [0003] Among the existing technologies, "Natural Gas Industry" published the research and application of fracturing technology for tight sandstone gas reservoirs in the Upper Paleozoic in northern Hubei in Issue S1 in 2001. According to the characteristics of low permeability of reservoirs, optimized fracturing fluid formula and delayed cross-linking The fracturing fluid system suitable for use in this area was...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68
CPCC09K8/665C09K8/68
Inventor 任雁鹏马托黄超王坤蒋文学黄永章柴巧玲汪小宇王所良韩婧婧
Owner BC P INC CHINA NAT PETROLEUM CORP
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