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Fracturing fluid prepared by recovery waste water of crude oil and preparation method of fracturing fluid

A fracturing fluid and sewage technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of difficult to meet fracturing construction, vegetable glue layering, high salinity, etc., to reduce water lock damage, The effect of increasing production and alleviating the demand for water resources

Active Publication Date: 2013-05-01
CHENGDU BAICHUN PETROLEUM TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the salinity of oil production wastewater is usually high, and contains a large number of bacteria, as well as impurities such as crude oil and solid particles, which often lead to stratification, corruption and deterioration of plant glue fracturing fluid, which is difficult to meet the requirements of fracturing construction.

Method used

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  • Fracturing fluid prepared by recovery waste water of crude oil and preparation method of fracturing fluid
  • Fracturing fluid prepared by recovery waste water of crude oil and preparation method of fracturing fluid
  • Fracturing fluid prepared by recovery waste water of crude oil and preparation method of fracturing fluid

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The water quality analysis of crude oil production sewage (salinity below 40,000) in a certain well in oilfield A is shown in Table 1.

[0036] Table 1 Water quality analysis of crude oil extraction wastewater

[0037]

[0038] According to 0.6% by weight of thickener, 0.05% by weight of metal ion stabilizer, 0.03% by weight of waterproof locking agent, 0.1% by weight of high temperature stabilizer, 1% by weight of clay stabilizer, and the balance is the above-mentioned oil production sewage, prepare fracturing fluid base fluid.

[0039] Add 0.03% by weight of a thickening auxiliary agent to the fracturing fluid base fluid and mix well to obtain a viscoelastic fracturing fluid. Use a high-temperature rheometer to test the temperature and shear resistance of fracturing fluid at 60°C. The test curve is shown in figure 1 . From the temperature and shear resistance test at 60°C, it can be seen that in 170s -1 In the case of continuous shearing, the viscosity of the f...

Embodiment 2

[0041] Use the above-mentioned crude oil production sewage, according to 0.8% by weight of thickener, 0.05% by weight of metal ion stabilizer, 0.03% by weight of waterproof locking agent, 0.15% by weight of high temperature stabilizer, 1% by weight of clay stabilizer, prepare fracturing fluid base fluid.

[0042] Add 0.04% by weight of a thickening auxiliary agent to the fracturing fluid base fluid and mix well to obtain a viscoelastic fracturing fluid. Use a high-temperature rheometer to test the temperature and shear resistance of fracturing fluid at 100°C. The test curve is shown in figure 2 , it can be seen from the temperature and shear resistance test at 100℃ that in 170s -1 In the case of continuous shearing, the viscosity of the fracturing fluid is always greater than 50 mPa s, indicating that the system has good temperature and shear resistance.

Embodiment 3

[0044] 1. On-site dosing

[0045] Prepare 180 cubic meters of crude oil production wastewater from oilfield A, put it into six 30-square-meter tanks, prepare the base liquid with jet technology, and circulate and inhale each additive into each tank of crude oil production sewage in turn according to the formula in Table 2, and circulate evenly to The apparent viscosity is greater than 30mPa·S, the thickener is inhaled slowly, subject to no agglomeration and fish eyes, check the viscosity of the liquid after the circulation is uniform.

[0046] Table 2 Fracturing fluid additive formula

[0047]

[0048]

[0049] 2. On-site construction

[0050] The formation temperature is 73°C, and the φ73mm N80 tubing is used for injection construction, and the packer protects the casing. During the fracturing construction process, add 0.03% by weight of thickening auxiliary agent to the base fluid from the sand mixer, add 0.03-0.05% by weight ammonium persulfate capsules in the pre-f...

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Abstract

The invention discloses an association polymer fracturing fluid prepared by recovery waste water of crude oil. The fracturing fluid comprises the following components: 0.2-1.4wt% of thickening agent, 0.01-0.1wt% of thickening assistant, 0.05-0.1% of metal ion stabilizing agent, 0.02-0.05wt% of water block preventive, 0.05-0.2wt% of high-temperature stabilizing agent, 1-2wt% of clay stabilizing agent and the balance of the recovery waste water of the crude oil. Compared with the prior art, the fracturing fluid has the benefits that the fracturing fluid system adopts an association polymer as a primary thickening agent, no cross-linking agent is used, structural viscosity is formed by the synergetic effect of the association polymer and an ampholytic surfactant, and the fracturing fluid has the characteristics of temperature resistance, good salt tolerance, shear resistance, bacterial corrosion resistance and low friction, and has a good solid carrying behavior when the viscosity is greater than 20mPa*s.

Description

technical field [0001] The invention relates to the technical field of increasing production of oil and gas reservoirs, in particular to a fracturing fluid prepared by using crude oil recovery sewage and a preparation method thereof. Background technique [0002] Hydraulic fracturing technology is a key technology for low-permeability reservoir reconstruction. Hydraulic fracturing needs to consume a lot of fresh water, which has an impact on local water resources. This impact is particularly serious in water-scarce areas such as Shanxi and Gansu. Crude oil extraction wastewater refers to the formation water produced together with the extraction of crude oil and natural gas. As oilfield exploitation enters the middle and later stages, the water content of crude oil is as high as 80-90%, and the treatment of crude oil production sewage has become an increasingly serious problem. If crude oil production wastewater can be used to prepare fracturing fluid, it can not only allevi...

Claims

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Application Information

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IPC IPC(8): C09K8/68
Inventor 刘通义赵众从陈光杰向静林波牛光洲谭坤戴秀兰黄趾海张立丰李燕
Owner CHENGDU BAICHUN PETROLEUM TECH
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