Large-scale transformed low-residue fracturing fluid

A technology of fracturing fluid and mass percentage, applied in the field of fracturing fluid, can solve the problems of high suspension sand performance requirements of fracturing fluid, restriction of construction progress, and large construction scale, so as to improve long-term suspension sand performance and reduce construction cost , The effect of enhanced sand-carrying ability

Active Publication Date: 2015-01-21
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Considering the characteristics of low-permeability oil fields, only large-scale fracturing can achieve effective production. However, there are limitations in the need for fracturing fluids for large-scale stimulation. First, the scale of peripheral fracturing operations is large, the amount of fluid in contact with the formation is large, and the damage range is large Second, the long-term construction has high requirements on the suspension performance of fracturing fluid; third, due to the large amount of liquid and the long time of liquid preparation, the construction progress is restricted, and the risk of liquid preparation is high. If there is a problem with fracturing, the construction cannot continue, resulting in waste

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Examples

Experimental program
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Effect test

Embodiment 1

[0014] Example 1. The low-temperature and low-residue fracturing fluid of this embodiment is mixed with the following components by weight percentage: thickener 0.18%, surfactant 0.06%, demulsifier 0.083%, clay stabilizer 0.4%, bactericide 0.02% %, defoamer 0.02%, gel breaker 0.00066%, gel breaking catalyst 0.0003%, and the balance is water.

Embodiment 2

[0015] Example 2. The fracturing fluid of this embodiment is mixed by the following components by weight percentage: medium and low temperature low residual fracturing fluid, thickener 0.22%, surfactant 0.08%, demulsifier 0.06%, clay stabilizer 0.3% %, 0.02% fungicide, 0.02% defoamer, 0.001% gel breaker, 0.0002% gel breaker catalyst, and the balance is water.

Embodiment 3

[0016] Example 3. The fracturing fluid of this embodiment is mixed by the following components by weight percentage: medium-temperature low-residue fracturing fluid, 0.30% thickener, 0.12% surfactant, 0.1% demulsifier, and 0.6% clay stabilizer , 0.18% fungicide, 0.09% defoamer, 0.06% gel breaker, 0.0006% gel breaker catalyst, and the balance is water. The fracturing fluid was applied to the F4 layer of well C72-34, which is an ultra-low permeability sandstone reservoir, with a depth of 1241.8-1238.2m and a temperature in the middle of the reservoir of about 67°C. The on-site fracturing operation went smoothly, the average sand ratio reached 26%, the fracturing fluid flowback rate reached 72.9%, and the oil production after reservoir fracturing was 3.95t / d. construction curve see figure 2 , see Table 1 for construction data.

[0017] Construction data of F4 layer of Well C72-34 Table 1

[0018]

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Abstract

The invention relates to a large-scale transformed low-residue fracturing fluid. The fracturing fluid disclosed by the invention is prepared by mixing the following components in percentage by weight: 0.18-0.50% of thickener, 0.06-0.16% of surface active agent, 0.05-0.1% of emulsion breaker, 0.3-0.9% of clay stabilizer, 0.02-0.18% of fungicide, 0.02-0.09% of defoaming agent, 0.00066-0.09% of gel breaker, 0.0002-0.0009% of gel breaking catalyst, and the balance of water, and according the components, a low-residue fracturing fluid adapted to oil layers at different temperatures can be formed. The low-residue fracturing fluid disclosed by the invention has the advantages of temperature resistance, shearing resistance, good rock stability, low leakoff of the fracturing fluid, and high efficiency of the fracturing fluid, has the characteristics of low residue and strong sand suspending capacity in oil layers and artificial cracks, and capability of achieving an effect of rapid field preparation, and solves the problem of large-scale fracturing transformation on low-permeability difficult-to-recovery reserves.

Description

technical field [0001] The invention relates to a fracturing fluid, in particular to a fracturing working fluid used for large-scale fracturing in low-permeability oil layers. Background technique [0002] After nearly a hundred years of development and utilization of petroleum resources, the quality of oilfield resources to be developed in the world has generally deteriorated, and the conditions of oil and gas reservoirs are complex. Fracturing technology has increasingly shown its pivotal role and has become the key to determining whether low-permeability oilfields can be effectively developed. Important means, in a certain sense, determine the depth and breadth of oil resource extraction and utilization, thus exerting a profound impact on the future development of the world oil industry. [0003] Fracturing fluid is a working fluid for fracturing construction, which is used to transfer energy during construction, open fractures in the oil layer, and transport proppant al...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/68
Inventor 张玉广韩松张浩张永平吕玲玲刘宇张洪涛高大鹏
Owner PETROCHINA CO LTD
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