Low-harm micro-molecular guar gum fracturing fluid

A small molecule, fracturing fluid technology, applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of large reservoir damage, strong water sensitivity, mismatch between development cost and output economic benefits, etc. To achieve the effect of reducing damage and improving effect

Active Publication Date: 2012-02-15
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The fracturing of low-permeability oil and gas reservoirs is often characterized by strong water sensitivity and greater reservoir damage. There are many fracturing fluid systems for such reservoirs, and the cost of some fracturing fluids is 50% higher than that of ordinary guar gum fracturing fluid systems. -200%, there are characteristics such as the mismatch between development costs and output economic benefits

Method used

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  • Low-harm micro-molecular guar gum fracturing fluid
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Examples

Experimental program
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Effect test

Embodiment 1

[0021] Add 952.5ml of water into a mixer with a capacity of 2000ml, add 30g of KCl and 1g of formaldehyde under stirring, then weigh 5g of small molecule guar gum, slowly add it into water under stirring, stir at high speed for 5min; then add 0.5g Sodium citrate, 2g sodium carbonate and 10g cetyltrimethylammonium bromide; stir in a mixer for 5min to complete the preparation of the base liquid; take 100ml of the base liquid prepared above, add 0.8g organic Linking agent, continue to stir for 2 minutes, the base liquid and the crosslinking agent react completely to form a jelly that can be hung, and the preparation of the jelly solution is completed; add 0.8g ammonium persulfate to the jelly formed by crosslinking under stirring, ℃ water bath to maintain a constant temperature, after 2h, the jelly is completely broken and hydrated. The apparent viscosity of the base liquid measured with a FANN-35 viscometer is 50mPa s, and the pH is 14; the rheological properties of the jelly ar...

Embodiment 2

[0023] Add 991.6ml of water into a mixer with a capacity of 2000ml, and add 5g of NH under stirring 4 Cl and 0.1g glutaraldehyde, then weigh 2g of small molecule guar gum, slowly add it into water under stirring, stir at high speed for 5min; then add 0.1g of sodium citrate, 0.2g of sodium hydroxide and 1g of dodecyl Trimethylammonium bromide; stir in a mixer for 5 minutes to complete the preparation of the base liquid; take 100 ml of the base liquid prepared above, add 0.4 g of an organic cross-linking agent under stirring, and continue stirring for 5 min. Add 0.05g of sodium persulfate to the cross-linked jelly under stirring, and keep the temperature in a water bath at 60°C. After 3 hours, the jelly is completely hydrated. The apparent viscosity of the base liquid measured with a FANN-35 viscometer is 24mPa·s, and the pH is 12; the rheological properties of the jelly are tested with an RS600 rheometer. For the data, see figure 2 ;The viscosity of the gel-breaking solution ...

Embodiment 3

[0025] Add 967.6ml of water into a mixer with a capacity of 2000ml, add 20g of KCl and 0.5g of glutaraldehyde under stirring, then weigh 4g of small molecule guar gum, slowly add it into water under stirring, and stir at high speed for 5 minutes; then Add 0.4g of sodium citrate, 1.5g of ammonia water and 6g of dodecyltrimethylammonium bromide; stir in a mixer for 5min to complete the preparation of the base liquid; take 100ml of the base liquid prepared above, and add 0.6 g organic cross-linking agent, after stirring for 3 minutes, the base liquid and the cross-linking agent completely react to form a jelly that can be hung; Constant temperature, after 1.5h, the jelly is completely hydrated. The apparent viscosity of the base liquid measured with a FANN-35 viscometer is 43mPa·s, and the pH is 13; the rheological properties of the jelly are tested with an RS600 rheometer. For the data, see image 3 ; The viscosity of the gel-breaking fluid measured by a capillary viscometer is...

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Abstract

The invention relates to a low-harm micro-molecular guar gum fracturing fluid. The fracturing fluid comprises base fluid, 0.05-0.8 wt% of gum breaking agent and 0.4-0.8 wt% of cross-linking agent. The base fluid comprises the following components in percentage by weight: 0.2-0.5% of micro-molecular guar gum, 0.1-1% of discharge aiding agent, 0.5-3% of clay stabilizing agent, 0.02-0.2% of pH adjusting agent, 0.01-0.1% of sterilizing agent, 0.01-0.05% of dispersing agent and the balance of water. The micro-molecular guar gum is modified guar gum with 400000-800000 molecular weight, the gum breaking agent is ammonium persulfate or sodium persulfate, and the cross-linking agent is borax or organic cross-linking agent. In the invention, although the addition amount of guar gum is small, the viscosity of a cross-linked liquid is equivalent to the common fracturing fluid, the harm of the fracturing fluid to strata is effectively reduced, and the effects of fracturing and reformation are improved.

Description

Technical field [0001] The invention relates to a low-damage guar gum fracturing fluid used in fracturing stimulation measures in the field of oil and gas field development. technical background [0002] With the continuous deepening of petroleum exploration and development, the proportion of low-permeability oil and gas reservoir reserves has been increasing year by year, and low-permeability oil and gas reserves will be the main resource base for increasing reserves and production in my country for a long time to come. However, the exploitation of low-permeability oil and gas resources has always been constrained by development costs, resulting in a mismatch between input and output economic benefits. Because compared with conventional oil and gas reservoirs, low-permeability and ultra-low-permeability reservoirs generally have deeper burial, higher temperature, smaller pore throats, a certain number of natural micro-fractures, serious heterogeneity, and stronger stress se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68
Inventor 郭建春王世彬雷跃雨何春明
Owner SOUTHWEST PETROLEUM UNIV
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