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Surfactant fracturing fluid suitable for ocean high-temperature oil and gas reservoir fracturing and preparation method

A technology for surfactants and oil and gas reservoirs, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of accelerated construction progress, complex construction procedures, slow construction progress, etc., to reduce damage and excellent sand-carrying performance , The effect of simple construction

Inactive Publication Date: 2016-07-06
CNPC SICHUAN GASOLINEEUM GEOPHYSICAL PROSPECTING ENG TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a seawater-based surfactant fracturing agent for offshore high-temperature oil and gas reservoir fracturing in view of the shortcomings of complex construction procedures, high cost, and slow construction progress when using fresh water to prepare fracturing fluid for large-scale hydraulic fracturing on offshore platforms. The fracturing fluid simplifies the fracturing process, reduces the cost, and can effectively speed up the construction progress, and the high-salinity seawater can effectively inhibit the expansion of clay minerals in the reservoir

Method used

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  • Surfactant fracturing fluid suitable for ocean high-temperature oil and gas reservoir fracturing and preparation method
  • Surfactant fracturing fluid suitable for ocean high-temperature oil and gas reservoir fracturing and preparation method
  • Surfactant fracturing fluid suitable for ocean high-temperature oil and gas reservoir fracturing and preparation method

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Effect test

Embodiment 1

[0030] This embodiment provides a method for preparing a surfactant fracturing fluid suitable for fracturing of marine high-temperature oil and gas reservoirs, including the following steps:

[0031] Step 1, taking a formula amount of 1% micelle regulator, 2% micelle accelerator and 1% organic breaker and mixing with seawater;

[0032] Step 2: Take 5% surfactant in formula and add it to the above seawater and stir rapidly to form high temperature seawater-based surfactant fracturing fluid.

[0033] Add 5% surfactant, 2% micelle regulator and 1% micelle accelerator to seawater, and form seawater-based fracturing fluid under rapid stirring. The fracturing fluid has good temperature and shear resistance, and can be -1 Under continuous shear for 90 minutes, the viscosity remains above 30mPa.s, and its rheological curve is as follows figure 1 shown.

[0034] Add 1% organic gel breaker, and completely break the gel and hydrate under the static condition of 100°C for 1 hour.

Embodiment 2

[0036] This embodiment provides a method for preparing a surfactant fracturing fluid suitable for fracturing of marine high-temperature oil and gas reservoirs, including the following steps:

[0037] In step 1, take a formula amount of 2% micelle regulator, 3% micelle accelerator and 2% organic breaker and mix with seawater;

[0038] Step 2: Take 7% surfactant and add it to the above seawater and stir rapidly to form high-temperature seawater-based surfactant fracturing fluid.

[0039] Indoor test of temperature and shear resistance of surfactant fracturing fluid:

[0040] Add 7% surfactant, 3% micelle regulator and 2% micelle accelerator to seawater, and form seawater-based fracturing fluid under rapid stirring. The fracturing fluid has good heat resistance and shear resistance. -1 Under continuous shear for 90 minutes, the viscosity remains above 30mPa.s, and its rheological curve is as follows figure 2 shown.

[0041] Add 2% organic gel breaker, and completely break th...

Embodiment 3

[0043] This embodiment provides a method for preparing a surfactant fracturing fluid suitable for fracturing of marine high-temperature oil and gas reservoirs, including the following steps:

[0044] In step 1, take a formula amount of 3% micelle regulator, 4% micelle accelerator and 2% organic breaker and mix with seawater;

[0045] In step 2, take 8% surfactant and add it to the above seawater and stir rapidly to form a high-temperature seawater-based surfactant fracturing fluid.

[0046] Indoor test of temperature and shear resistance of surfactant fracturing fluid:

[0047]Add 8% surfactant, 3% micelle regulator and 4% micelle accelerator to seawater, and form seawater-based fracturing fluid under rapid stirring. The fracturing fluid has good temperature and shear resistance. -1 Under continuous shear for 90 minutes, the viscosity remains above 30mPa.s, and its rheological curve is as follows image 3 shown.

[0048] Add 2% organic gel breaker, and completely break the...

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Abstract

The invention provides a surfactant fracturing fluid suitable for ocean high-temperature oil and gas reservoir fracturing. The surfactant fracturing fluid consists of the following raw materials in percentage by weight: 1-3% of micelle regulator, 1-4% of micelle accelerant, 1-2% of organic gel breaker, 5-8% of surfactant and the balance of seawater. According to the surfactant fracturing fluid suitable for ocean high-temperature oil and gas reservoir fracturing provided by the invention, the thickening property is realized through specially modified surfactant acrylamide alkyl polyglucoside and seawater. When the surfactant fracturing fluid is dissolved in saline water, the surfactant molecules of a specific structure can quickly form a micelle similar to a macromolecular coil structure under the effects of the micelle regulator and the micelle accelerant; the mutually-wound net-structure micelle is completely different from a conventional spherical or rod-like micelle structure and has certain distortion resistance; and thus, the fracturing fluid system has higher viscosity and strength, and the fluid has better temperature resistance and sand carrying capacity.

Description

technical field [0001] The invention belongs to the technical field of seawater-based surfactant fracturing fluid, and specifically relates to a surfactant fracturing fluid suitable for fracturing high-temperature marine oil and gas reservoirs and a preparation method thereof, which are used for fracturing construction of high-temperature marine oil and gas reservoirs. Background technique [0002] In recent years, with the continuous expansion of offshore exploration areas and the gradual increase of low-permeability reservoirs, hydraulic fracturing stimulation measures in oil and gas field development have gradually been widely used and the construction scale has gradually expanded. However, at present, the liquid system used in offshore fracturing is all freshwater fracturing fluid system, and the platform needs to be transported from land due to the scarcity of fresh water, which has the disadvantages of long distance, high cost, and affecting the construction progress. ...

Claims

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Application Information

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IPC IPC(8): C09K8/68
CPCC09K8/68C09K2208/26
Inventor 杨发汪小宇吴增智李勇黄超王所良许伟星王玉功周然蒋文学陈迎花金娜樊庆缘安全成柴巧玲
Owner CNPC SICHUAN GASOLINEEUM GEOPHYSICAL PROSPECTING ENG TECH RES INST
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