Seawater base fracturing fluid

A technology of seawater and base fluid, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of reducing swelling performance, reducing hydrodynamic volume, hindering water molecules from penetrating into the polymer, and avoiding the impact Effect

Inactive Publication Date: 2013-09-04
CNOOC ENERGY TECH & SERVICES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the cost of synthetic polymers is higher than that of vegetable gums; the second type is clean fracturing fluid systems, which use surfactants as thickeners, and their temperature resistance is usually poor, generally less than 100°C; the third type It is a modified anionic guar gum fracturing fluid system (CN102618249). This system uses carboxymethyl and sulfonic acid guar gum as thickeners. Due to t...

Method used

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  • Seawater base fracturing fluid

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Add 990.9ml of seawater into a mixer with a capacity of 2000ml, add 5g of KCl and 0.1g of formaldehyde under stirring, then weigh 3g of betaine-type amphoteric guar gum, slowly add it into seawater under stirring, and stir at high speed for 5 minutes; Then add 1g of cetyltrimethylammonium bromide; stir in a mixer for 5 minutes to obtain a uniform transparent seawater base liquid; take 100ml of the seawater base liquid prepared above, add 0.2g of zirconium acetate under stirring, and continue stirring for 2min Finally, the seawater base liquid reacts completely with the cross-linking agent to form jelly, and the preparation of the jelly solution is completed; add 0.1 g of sodium persulfate to the jelly formed by cross-linking under stirring, and keep the constant temperature in a water bath at 50°C. After 3 hours, The jelly is completely broken and hydrated. The apparent viscosity of the base liquid measured with a FANN-35 viscometer is 36mPa s; the rheological propertie...

Embodiment 2

[0031] Add 981.5ml of seawater into a mixer with a capacity of 2000ml, and add 10g of NH under stirring 4 Cl and 0.5g formaldehyde, then take by weighing 4g phosphate-type amphoteric guar gum, slowly add it in seawater under stirring state, high-speed stirring 5min; Then add 4g hexadecyltrimethylammonium bromide; Stir for 5 minutes to obtain a uniform transparent seawater base solution; take 100ml of the above prepared seawater base solution, add 0.4g of aluminum chloride under stirring, continue stirring for 2 minutes, the seawater base solution and the cross-linking agent completely react to form a jelly, and complete Preparation of jelly solution; add 0.3 g of ammonium persulfate to the jelly formed by cross-linking under stirring, keep constant temperature in a water bath at 50°C, and after 2 hours, the jelly is completely broken and hydrated. The apparent viscosity of the base liquid measured with a FANN-35 viscometer is 42mPa s; the rheological properties of the jelly ar...

Embodiment 3

[0033] Add 972.2ml of seawater into a mixer with a capacity of 2000ml, and add 15g of NH under stirring 4 Cl and 0.8g formaldehyde, then take by weighing 5g phosphate-type amphoteric guar gum, slowly add it in the seawater under stirring state, high-speed stirring 5min; Then add 7g dodecyltrimethylammonium bromide; Stir in the medium for 5 minutes to obtain a uniform transparent seawater base liquid; take 100ml of the seawater base liquid prepared above, add 0.7g of zirconium acetate under stirring, continue stirring for 2 minutes, the base liquid and the cross-linking agent completely react to form a jelly, and the jelly is completed Solution preparation; add 0.6 g of sodium persulfate to the gel formed by cross-linking under stirring, keep constant temperature in a water bath at 50°C, and after 2 hours, the gel is completely broken and hydrated. The apparent viscosity of the base liquid measured with a FANN-35 viscometer is 72mPa·s; the rheological properties of the jelly ar...

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Abstract

The invention relates to a seawater base fracturing fluid which comprises a seawater base fluid, a gel breaking agent equivalent to 0.1-0.8% of the weight of the seawater base fluid, and a cross-linking agent equivalent to 0.2-0.8% of the weight of the seawater base fluid, and is characterized in that the seawater base fluid comprises the following components in percentage by weight: 0.3-0.6% of a thickening agent, 0.1-1% of a discharge aiding agent, 0.5-3% of a clay stabilizing agent, 0.01-0.1% of a sterilizing agent and the balance being seawater; the gel breaking agent is ammonium persulfate or sodium persulfate; the cross-linking agent is aluminum chloride or zirconium acetate; the clay stabilizing agent is potassium chloride or ammonium chloride; the discharge aiding agent is dodecyltrimethylammonium bromide or cetyltrimethylammonium bromide; and the sterilizing agent is methanal or dodecyl dimethyl benzyl ammonium chloride. The seawater base fracturing fluid has the advantages that the salt tolerance of the seawater base fracturing fluid is outstanding and stable cross-linking can be achieved in a weak alkaline environment.

Description

technical field [0001] This patent belongs to the technical field of oil and gas field development and stimulation, and in particular relates to a seawater-based fracturing fluid. Background technique [0002] With the increasing development of offshore oil and gas fields, more and more high-quality reserves have been used, and the proportion of low-permeability reserves in undeveloped reserves has reached about 20%. In 2008, the crude oil output of offshore low-permeability oil and gas fields was 150×10 4 m 3 , the natural gas production is 4.1×10 8 m 3 , accounting for 4.3% and 3.8% of the total output respectively, far below the onshore level. Therefore, how to efficiently develop and produce offshore low-permeability reservoirs will be the key to achieving stable production of offshore oil and gas fields in the future, and it also has important strategic significance for maintaining my country's energy security. [0003] Hydraulic fracturing, as an important stimula...

Claims

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Application Information

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IPC IPC(8): C09K8/68
Inventor 杨立平郭树彬郭士生张吉江赵战江陈永锋郭建春王世彬
Owner CNOOC ENERGY TECH & SERVICES
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