High-density fracturing fluid capable of slowing crosslinking and resisting high temperature

A high-temperature, high-density technology, applied in the field of fracturing fluid, can solve the problems of high environmental pollution of sodium bromide, low fracturing fluid density, limited liquid column pressure, etc. The effect of column pressure

Active Publication Date: 2013-08-21
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conventional fracturing fluids have a low density and cannot meet the needs of fracturing operations in abnormally high pressure, ultra-deep or tight oil and gas reservoirs
Increasing the density of fracturing fluid is an effective way to reduce the pressure of wellhead construction. Sodium bromide was often used for weighting at home and abroad, and the weighting agent can be increased up to 1.5*10 3 kg / m 3 , but due to the large environmental pollution and high cost of sodium bromide, it is less used now
At present, potassium chloride or sodium chloride is mostly used in China, and the maximum density of fracturing fluid aggravated by sodium chloride is 1.18*10 3 kg / m 3 , the liquid column pressure provided is limited

Method used

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  • High-density fracturing fluid capable of slowing crosslinking and resisting high temperature
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  • High-density fracturing fluid capable of slowing crosslinking and resisting high temperature

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A slow-crosslinking, high-temperature, high-density, high-density fracturing fluid. The slow-crosslinking, high-temperature, high-density fracturing fluid is composed of a stock solution and crosslinking, and the volume ratio of the stock solution to the crosslinking solution is 10:1. By uniformly mixing the stock solution and the cross-linking fluid, a slow cross-linking, high-temperature, high-density fracturing fluid can be obtained.

[0031] The weight percentages of the raw materials and individual components used in the slow-crosslinking, high-temperature, high-density fracturing fluid stock solution are 0.55% hydroxypropyl guar, 44.4% weighting agent sodium nitrate, 1% ZJ-07 drainage aid, and citric acid 0.025%, the balance is water.

[0032] The weight percentages of the raw materials and components used in the slow-crosslinking, high-temperature, high-density fracturing fluid cross-linking fluid are: cross-linking agent YGB 2%, cross-linking agent HT 2%, pH regulato...

Embodiment 2

[0035] The difference from Example 1 is that the weight percentages of the raw materials and components used in the slow-crosslinking, high-temperature, high-density fracturing fluid stock solution are 0.55% hydroxypropyl guar gum, 25% sodium nitrate as a weighting agent, and weighting agent Potassium chloride 9%, ZJ-07 drainage aid 1%, citric acid 0.025%, the balance is water.

[0036] The weight percentages of the raw materials and individual components used in the slow-crosslinking, heat-resistant, high-density fracturing fluid cross-linking fluid are 2% cross-linking agent YGB, 2% cross-linking agent HT, 0.32% NaOH, and the balance is water.

[0037] The density of the slow-crosslinking, high-temperature, high-density fracturing fluid formed by this formula is 1.21*10 3 kg / m 3 , The crosslinking time is 3min, at 140℃, 170S -1 The viscosity remains above 280Pa·S under the conditions of 90min shear. See the results of the experiment figure 2 . This formula has been successfully...

Embodiment 3

[0039] The difference from Example 1 is that the weight percentages of the raw materials and components used in the slow-crosslinking, high-temperature, high-density fracturing fluid stock solution are 0.55% hydroxypropyl guar gum, 41% sodium nitrate as a weighting agent, and weighting agent Potassium chloride 10%, ZJ-07 drainage aid 1%, citric acid 0.025%, the balance is water.

[0040] The weight percentages of the raw materials and components used in the slow-crosslinking, high-temperature, high-density fracturing fluid cross-linking fluid are: cross-linking agent YGB 1.5%, cross-linking agent HT 1.5%, NaOH 0.2%, sodium persulfate 0.4%, and the rest The amount is water.

[0041] The density of the formed slow-crosslinking, high-temperature, high-density fracturing fluid is 1.33*103kg / m 3 , Crosslinking time is 2min. This formula is at 100℃, 170S without gel breaker -1 The viscosity remains above 100Pa·S under the conditions of 90min shearing. See the results of the experiment ...

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Abstract

The invention relates to a high-density fracturing fluid capable of slowing crosslinking and resisting high temperature. The fracturing fluid is composed of a stock solution and a crosslinking liquid with a volume ratio of 10 : 1, wherein the stock solution comprises, by weight percent, 0.5-0.65 % of hydroxypropyl guar gum, 8-45 % of a weighting agent A, 6-30 % of a weighting agent B, 0.5-2 % of a ZJ-07 cleanup additive, 0.01-0.04 % of a pH-value conditioning agent A, and the balance being water; the crosslinking liquid comprises, by weight percent, 0.5-3 % of a cross-linking agent YGB, 1-2 % of a cross-linking agent HT, 0.1-0.4 % of a pH-value conditioning agent B, 0-0.35 % of a gel breaker and the balance being water. The fracturing fluid is good in temperature-resistance and shearing-resistance performances, wherein the temperature-resistance performance is up to 145 DEG C, and a viscosity is still more than 120 Pa*S after the liquid is sheared for 90 minutes under 145 DEG C and 170 S<-1>.

Description

Technical field [0001] The invention relates to the technical field of fracturing fluids used in the fracturing stimulation technology of oil wells or natural gas wells, and is a new type of slow-crosslinking, high-temperature, high-density fracturing fluid suitable for fracturing reconstruction of abnormally high pressure, ultra-deep or tight oil and gas reservoirs . Background technique [0002] Hydraulic fracturing is one of the important stimulation measures to increase production of oil and gas wells in low-permeability and ultra-low permeability reservoirs, increase injection of water wells, and increase the productivity and recovery of oil and gas wells. This technology uses ground high-pressure pump injection, and the liquid fracturing fluid is the working fluid in the process of hydraulic fracturing to reform the oil and gas reservoir. It plays the role of transmitting pressure, forming formation fractures, and carrying proppant into the fractures. [0003] Abstract With ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68
Inventor 罗兆王嘉淮潘竟军刘炜怡宝安吴丽蓉
Owner PETROCHINA CO LTD
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