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Fracturing fluid

A fracturing fluid and base fluid technology, applied in the field of fracturing fluid, can solve problems such as the soaring price of guanidine rubber sheets, and achieve good sand-carrying effects

Active Publication Date: 2014-03-26
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For many years, guar gum fracturing fluid has occupied a dominant position in the domestic and foreign fracturing fluid market due to its good sand-carrying properties, temperature resistance and shear resistance, gel breaking performance, and relatively low cost. Affected by multiple factors such as climate anomalies, local industry association protection, and strong international demand, the price of guanidine rubber has soared several times, creating huge cost pressures on the fracturing of low-permeability oil and gas reservoirs in China

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A new well (1#) has a reservoir depth of 1630m and a formation temperature of 47°C. On April 11, 2012, the base fluid A 90m was prepared according to the following formula 3 , base liquid B 30m 3 .

[0033] Base liquid A by weight 100%:

[0034]

[0035]

[0036] Base fluid B by weight 100%:

[0037]

[0038] The gel breaker is ammonium persulfate, and the amount is 80kg.

[0039] The design and construction displacement of the well is 1.2m 3 / min, the mixing ratio is 3:1, that is, the displacement of base liquid A is 0.9m 3 / min, the displacement of base fluid B is 0.3m 3 / min, the base liquid B was injected into the sand mixing tank through the sand mixing truck fluid addition pump on site, the construction was smooth, the pressure was stable, and the designed sand addition volume was 25m 3 . Shut down the well for 35 minutes after fracturing and started blowing. The viscosity of the gel breaking fluid was 4.1mPa.s as measured by sampling, and continue...

Embodiment 2

[0041] In a new well (2#), the reservoir depth is 1030m, and the formation temperature is 35°C. On April 19, 2012, the base fluid A 100m was prepared according to the following formula 3 , base liquid B 40m 3 .

[0042] Base liquid A by weight 100%:

[0043]

[0044]

[0045] Base fluid B by weight 100%:

[0046]

[0047] The gel breaker is ammonium persulfate, and the amount is 75kg.

[0048] The design and construction displacement of the well is 1.5m 3 / min, the mixing ratio is 2.5:1, that is, the displacement of base liquid A is 1.07m 3 / min, the displacement of base fluid B is 0.43m 3 / min, the base liquid B was injected into the sand mixing tank through the sand mixing truck fluid addition pump on site, the construction was smooth, the pressure was stable, and the designed sand addition volume was 30m 3 . Shut down the well for 30 minutes after fracturing and started to blow out. The viscosity of the gel breaking fluid was 7.5mPa.s as measured by sampling...

Embodiment 3

[0050] An old well (3#) has a reservoir with a buried depth of 1650m and a formation temperature of 47°C. The daily output of pure oil was 15.9m in the first trial run 3 , the liquid volume decreased significantly after 19 months of production, combined with the analysis of the characteristics of the block, it was concluded that the conductivity of the propped fractures of the well decreased. On April 25, 2012, the base fluid A90m was prepared according to the following formula 3 , base liquid B 30m 3 .

[0051] Base liquid A by weight 100%:

[0052]

[0053] Base fluid B by weight 100%:

[0054]

[0055] The gel breaker is ammonium persulfate, and the amount is 100kg.

[0056] The design and construction displacement of the well is 1.0m 3 / min, the mixing ratio is 3:1, that is, the displacement of base liquid A is 0.75m 3 / min, the displacement of base fluid B is 0.25m 3 / min, the base liquid B was injected into the sand mixing tank through the sand mixing truck l...

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Abstract

The invention relates to a fracturing fluid which comprises a base fluid A and a base fluid B, wherein the base fluid A is prepared from a thickening agent, a hydrotropy thickening agent, a clay stabilizer, a discharge aiding agent, a sterilizing agent, a demulsifying agent, a low-temperature activator and water; the base fluid B is prepared from a low-molecular weight polymer, the clay stabilizer, the discharge aiding agent, the sterilizing agent, the demulsifying agent, the low-temperature activator and the water. When fracturing construction is carried out, the base fluid A and the base fluid B are mixed in proportion, the low-molecular weight polymer and a thickening agent molecule are mutually wound in a stirring process to form a certain space reticular structure for effective thickening, and the hydrotropy thickening agent compresses a winding structure through electric repulsion so that a gel is further thickened and forms good solid carrying capacity; the shearing is carried out at 50 DEG C and 170S-1,3.5MPa for 60 minutes, the viscosity is more than 50 mPa.s, an oxidized type gel breaker is added according to the proportion of 0.01%-0.20% in a wedge shape, the gel can be thoroughly broken within 2 hours, and the viscosity of gel breaking liquid is less than 5 mPa.s.

Description

technical field [0001] The invention relates to the technical field of increasing production of oil-water wells in oil fields, in particular to a fracturing fluid. Background technique [0002] Hydraulic fracturing is the main measure for the effective development of low-permeability oil and gas fields. The ideal fracturing fluid should have a certain viscosity during construction, which can meet the requirements of fracture creation and sand-carrying, and can quickly and completely break the gel after construction, so as to Ensure rapid flowback of fracturing fluid, thereby reducing damage to reservoirs and propped fractures. For many years, guar gum fracturing fluid has occupied a dominant position in the domestic and foreign fracturing fluid market due to its good sand-carrying properties, temperature resistance and shear resistance, gel breaking performance, and relatively low cost. Affected by multiple factors such as climate anomalies, protection of local industry ass...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68
CPCC09K8/602C09K8/604C09K8/605C09K8/665C09K8/68C09K2208/26
Inventor 常彦荣冉新权朱天寿沈复孝马能平方国庆陆红军陈宝春李建山鄢长灏齐银李楷曹润荣
Owner PETROCHINA CO LTD
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