High-temperature-resistance low-friction weighted clean fracturing fluid and preparation method thereof

A clean fracturing fluid, high temperature resistant technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of poor compatibility of weighting agents, poor temperature resistance, and reduce friction, and achieve an increase in apparent viscosity. and structural strength, good temperature and shear resistance, and enhance the effect of association

Active Publication Date: 2016-07-06
CHENGDU BAICHUN PETROLEUM TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But so far, the commonly used weighted fracturing fluids also have many problems. First, although ordinary guar gum weighted fracturing fluids have good temperature resistance, they have high residue content, difficult control of cross-linking time, and high pipeline friction , not anti-shear and other shortcomings can not be ignored; secondly, the VES viscoelastic surfactant fracturing fluid, which is considered to be clean and residue-free, can significantly reduce the damage, but its temperature resistance is poor, the use temperature is limited, and it is not compatible with the weighting agent. The compatibility is poor, and it cannot meet the fracturing requir

Method used

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  • High-temperature-resistance low-friction weighted clean fracturing fluid and preparation method thereof
  • High-temperature-resistance low-friction weighted clean fracturing fluid and preparation method thereof
  • High-temperature-resistance low-friction weighted clean fracturing fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] KCl-weighted clean fracturing fluid formula and evaluation of temperature and shear resistance at 150°C:

[0054] The components of the weighted cleaning fracturing fluid are, by weight percentage, respectively: 0.6% of high temperature resistant thickener, 0.2% of high temperature stabilizer, 17% of weighting agent, and the balance is clear water. The weighting agent uses KCl as a raw material to prepare a weighted clean fracturing fluid base fluid; add a system synergist with a weight percentage of 0.5% to the weighted clean fracturing fluid base fluid, and mix well to obtain a low-viscosity, high-viscoelastic weighting agent Clean fracturing fluid with a density of 1.12g / cm 3 .

[0055] Using a high temperature rheometer at 170s -1 , under the condition of 150°C, the temperature and shear resistance test was carried out for 120 minutes on the clean fracturing fluid aggravated by KCl, and the test curve is as follows figure 1 shown.

[0056] It can be seen from th...

Embodiment 2

[0058] NaNO 3 Heavy clean fracturing fluid formulation and 170°C temperature and shear performance evaluation:

[0059] The components of the weighted clean fracturing fluid are: 0.7% anti-high temperature thickener, 0.3% high temperature stabilizer, weighting agent NaNO 3 42%, the balance is clear water, to prepare a weighted clean fracturing fluid base fluid; add a system synergist with a weight percentage of 0.7% in the weighted clean fracturing fluid base fluid, and mix well to obtain low viscosity and high viscoelasticity A weighted clean fracturing fluid with a density of 1.32g / cm 3 .

[0060] Using a high temperature rheometer at 170s -1 , for NaNO at 170°C 3 The aggravated clean fracturing fluid was subjected to the temperature and shear resistance test for 120 minutes, and the test curve was as follows figure 2 shown.

[0061] From the rheological curve at 170°C, it can be seen that at 170s -1 In the case of continuous shear, the viscosity of the aggravated cl...

Embodiment 3

[0063] On-site construction friction performance test of aggravated clean fracturing fluid:

[0064] The on-site construction friction test was carried out by using the aggravated clean fracturing fluid and clear water in Example 1 and Example 2, and the variation curves of several kinds of fluid friction with displacement are as follows image 3 shown.

[0065] Among them: the test string adopts 3-1 / 2″ (inner diameter: 76mm) × 2000m smooth oil pipe, and carries two pressure gauges into the well to test the bottom hole pressure.

[0066] By polynomial fitting of the friction curves of the three groups of liquids, the polynomial of the change of the liquid friction with the displacement is obtained, and the liquid friction at the specified displacement is calculated, and then the resistance reduction rate of the fracturing fluid is calculated. Examples 1 and 1 2. Table 1 shows the calculation results of the resistance reduction rate of the weighted fracturing fluid at differen...

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Abstract

The invention discloses a high-temperature-resistance low-friction weighted clean fracturing fluid which is suitable for high-temperature and high-pressure reservoir reconstruction at 170 DEG C and a preparation method thereof.The fracturing fluid is prepared from, by weight, 0.2%-0.8% of high-temperature-resistance thickening agent, 0.1%-0.8% of system synergist, 0.1%-0.3% of high temperature stabilizer, 0%-42% of weighting agent and the balance fresh water.The high-temperature-resistance low-friction weighted clean fracturing fluid has the following functions and advantages that the weighting agent can be adopted for weighting, and the density is adjustable between 0 and 1.32 g/cm<3>; good temperature-resistance and anti-shearing properties are achieved, and the requirement of high-temperature deep well fracturing construction at 170 DEG C can be met by adjusting a formula; a good resistance reduction property is achieved, pipeline friction resistance can be effectively reduced, and the resistance reduction rate can reach 70%; the fracturing fluid is a fluid with a reversible structure, and the structure damage after high shearing is small; the residue content of the fracturing fluid is decreased to below 10 mg/L, damage to a reservoir and supporting cracks is reduced, the fracturing effect is improved, and the reservoir productivity is increased.

Description

technical field [0001] The invention relates to the technical field of increasing production of oil and gas reservoirs, in particular to a high-temperature-resistant, low-friction aggravated clean fracturing fluid that can be applied to high-temperature deep well reservoir reconstruction. Background technique [0002] Fracturing fluid is one of the keys to fracturing low-permeability reservoirs. With the continuous development of fracturing to deep wells and ultra-deep wells, the characteristics of high temperature, high pressure, and abnormal fracture pressure have also become challenges that fracturing fluid technology must face. Therefore, new requirements are put forward for fracturing fluid technology. [0003] For high-temperature, deep-well and high-pressure reservoirs, due to the tight development of oil and gas reservoirs, strong structural stress, high formation pore pressure and serious reservoir damage, high formation fracture pressure and fracture extension pres...

Claims

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Application Information

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IPC IPC(8): C09K8/68
CPCC09K8/602C09K8/68C09K8/882C09K2208/26C09K2208/28
Inventor 胡永全刘通义陈光杰谭坤林波
Owner CHENGDU BAICHUN PETROLEUM TECH
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