Oil displacement agent prepared from fracturing fluid flowback fluid and oil displacement method thereof
A technology of flowback liquid and oil displacement agent, which is applied in the direction of chemical instruments and methods, earthwork drilling, and drilling compositions, etc., which can solve the problem that the amount of additives is difficult to determine, cannot be fully utilized, and has no viscoelastic surfactant Content calibration and other issues, to achieve the effect of low equipment requirements, simple composition, and rapid dissolution
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1
[0031] Embodiment 1: the composition of oil displacement agent
[0032] The oil displacing agent prepared with fracturing fluid flowback fluid, based on the total amount of the system 100%, consists of 0.03-0.3wt% viscoelastic surfactant (converted to the effective concentration of viscoelastic surfactant in the flowback fluid) and the balance formation water composition.
[0033] The fracturing fluid flowback fluid is collected from a domestic oilfield fracturing site, and its main composition structure is:
[0034]
[0035] After testing, its effective concentration is 0.3%.
[0036] K of formation water + and Na + The total concentration is 10000~180000mg / L, Ca 2+ and Mg 2+ The total concentration is 500-20000mg / L.
Embodiment 2
[0037] Example 2: Oil-water interfacial tension of oil-displacing agent prepared with fracturing fluid flowback fluid
[0038] Referring to the China Petroleum and Natural Gas Industry Standard "Measurement Method of Surface and Interfacial Tension", the oil displacement agent was prepared with formation water, and the interfacial tension between the oil displacement agent and the dehydrated crude oil in the reservoir was measured with a spinning drop interfacial tensiometer Texas-500C at 80 °C.
[0039] The flowback fluid described in Example 1 was diluted to different multiples with formation water to obtain oil displacement agents with different effective concentrations, and their interfacial tension values with reservoir crude oil were measured respectively.
[0040] The experimental results show that the oil-water interfacial tension can reach 10 within the concentration range of 0.03-0.30wt%. -4 ~10 - 3 The ultra-low order of mN / m shows a superior ability to reduce t...
Embodiment 3
[0041] Example 3: Oil displacement agent changes rock wettability
[0042] The quartz slices were aged with a mixed solution of dehydrated crude oil / n-heptane (the volume ratio of the two was 4:1), and the static contact angle measurement method in the literature was used to measure the change of the surface contact angle of the quartz slices before and after the system was applied.
[0043] The flowback fluid described in Example 1 was diluted to different multiples with formation water to obtain oil displacement agents with different effective concentrations, and the changes in the surface contact angle of the quartz plate were measured before and after the system was applied.
[0044]The experimental results show that the system has a strong impact on the wettability of the quartz plate, enhances the hydrophilicity of the surface of the quartz plate, transforms the oil-wet surface into a weakly hydrophilic surface, and the contact angle decreases rapidly with the increase of...
PUM
| Property | Measurement | Unit |
|---|---|---|
| adsorption capacity | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
Login to View More