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An inverse microemulsion polymer fracturing fluid system that can be applied online

A technology of inverse microemulsion and fracturing fluid, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problem that the fracturing fluid system cannot complete the construction, and the fracturing fluid forms powder particles or fish eyes. Possibility and other issues are put forward to achieve excellent drag reduction effect, excellent temperature and salt resistance performance, and excellent sand-carrying performance.

Active Publication Date: 2020-05-22
SOUTHWEST PETROLEUM UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Acrylamide multi-polymer copolymer is a typical and most extensively researched water-soluble polymer, and its application performance as a fracturing fluid thickener has gradually matured. When the construction process requires simplification, there are some disadvantages or limitations in the use of this type of fracturing fluid: First, because the solution prepared by the dry powder thickener dissolves slowly during use, even the instant thickener needs to be dissolved to a certain extent. time; secondly, when prepared on site, the dry powder thickener has strong water absorption, and the mixing conditions are almost likely to cause the fracturing fluid to form powder particles or fish eyes, which will affect the performance of the fracturing fluid; finally, even if some dry powder thickeners can meet the Continuous mixing construction conditions, but under extreme conditions, if there is no mixing truck, only the sand mixing truck, and only the "online construction" mode can be used, this type of fracturing fluid system cannot complete the construction at all
The patent confirmed the feasibility and remarkable effect of inverse microemulsion polymers as drag reducers for fracturing fluids, but did not further propose the possibility of using them as high-viscosity sand-carrying fracturing fluids

Method used

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  • An inverse microemulsion polymer fracturing fluid system that can be applied online
  • An inverse microemulsion polymer fracturing fluid system that can be applied online
  • An inverse microemulsion polymer fracturing fluid system that can be applied online

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The total salinity of the flowback fluid of a shale gas well is 32000mg / L. The formula components and dosage of the slick water fracturing fluid prepared by using the flowback fluid of the shale gas well are shown in Table 1.

[0037] Table 1, Example 1 slick water fracturing fluid formula components and consumption

[0038]

[0039] Test the drag-reducing performance of the above slick water fracturing fluid:

[0040] Test instruments and equipment: Coiled tubing friction test equipment (375m pipeline, inner diameter Φ2.54cm), 700-type fracturing truck, density meter (to measure liquid density).

[0041] Test method: Start the pump of the fracturing vehicle, fill the selected coiled tubing group pipeline and experimental pipeline with clean water, and adjust the clean water displacement in turn (at least 5 displacements are recommended, 0.1, 0.2, 0.3, 0.4, 0.5m 3 / min), each displacement was stabilized for about 1min, and after the test pressure stabilized, the rea...

Embodiment 2

[0046] The formulation components and dosage of a 150°C weak gel fracturing fluid are shown in Table 3.

[0047] Table 3. Components and dosage of the 150°C weak gel fracturing fluid formulation in Example 2

[0048]

[0049] For a picture display of the weak gel fracturing fluid, see figure 2 . Through a large number of laboratory experiments and simulations, the temperature resistance of the weak gel fracturing fluid system can reach 150 °C. The experimental results of the temperature resistance and shear resistance test of the formula fracturing fluid are shown in image 3 . Fracturing fluid after 800s -1 The liquid viscosity is low at high speed shear, but the shear rate drops to 170s -1 Afterwards, the viscosity increased rapidly again, and after 120 minutes, the viscosity of the fracturing fluid remained above 50mPa·s, indicating that it has excellent temperature and shear resistance.

Embodiment 3

[0051] The present invention provides an optimization scheme for the 120°C weak gel fracturing fluid formula for on-line construction, as shown in Table 4. Among them, the total salinity of water source in Yanchang well is 25000mg / L.

[0052] Table 4. 120°C Weak Gel Fracturing Fluid Formulation Components and Dosage for Online Construction in Example 3

[0053]

[0054] Indoor simulated on-line construction process: add dosing water to the mixer, add instant emulsion thickener, clay stabilizer, functional additive, and weak crosslinking agent according to the above ratio under stirring conditions, and measure it immediately after mixing evenly 70ml of fracturing fluid was transferred to the RS6000 rheometer rotating cylinder test system for temperature resistance and shear resistance test, the results are shown in Figure 4 . It can be seen from the viscosity-time curve that when using high-salinity water source to prepare fracturing fluid and carry out on-line constructi...

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Abstract

The invention discloses an inverse-phase micro-emulsion polymer fracturing fluid system with an online construction function. The inverse-phase micro-emulsion polymer fracturing fluid system comprisesinstant dissolving emulsion thickening agents, functional auxiliaries, a clay stabilizer and fluid preparation water. The instant dissolving emulsion thickening agents are inverse-phase micro-emulsion polymers, and inverse-phase micro-emulsion polymerization is carried out on raw materials including acrylamide, acrylic acid, strong-hydrophilicity monomers, a functional monomer A, a functional monomer B, pH (potential of hydrogen) regulators, solubilizers, composite emulsifiers, oil solvents, initiators and deionized water to obtain the instant dissolving emulsion thickening agents; the functional monomer A is methyl methacrylate or ethyl methacrylate or a mixture of the methyl methacrylate and the ethyl methacrylate; the functional monomer B is vinylphosphonic acid or vinyl sulfonic acid;the functional auxiliaries are non-ionic surfactants; the clay stabilizer is potassium chloride, and the fluid preparation water is clear water or high-mineralization water or treated stratum flow-back fluid. The inverse-phase micro-emulsion polymer fracturing fluid system has the advantages that the inverse-phase micro-emulsion polymer fracturing fluid system is high in dispersing and swelling speed and can be prepared in a batch manner or can be continuously mixed, 'online construction' requirements even can be completely met by the inverse-phase micro-emulsion polymer fracturing fluid system, processes for constructing the inverse-phase micro-emulsion polymer fracturing fluid system are simple, and the fracturing cost can be reduced.

Description

technical field [0001] The invention relates to the technical field of oil and gas reservoir stimulation, in particular to an inverse microemulsion polymer fracturing fluid system capable of on-line construction. Background technique [0002] Due to the high content of insoluble matter and the additional damage caused by cross-linking, the commonly used natural plant gum fracturing fluids such as guar gum and cellulose can block the fracturing reservoir and the proppant filling layer, which greatly improves the fracture conductivity. The decline will not achieve the expected effects of fracturing stimulation, or even negative effects. In addition, the temperature and shear resistance of this type of fracturing fluid (especially the shear resistance of jelly) is not ideal, and it is difficult to apply to fracturing in high-temperature deep formations. Therefore, synthetic water-soluble polymer fracturing fluids have once become a hot spot in research at home and abroad. Comp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/68
CPCC09K8/604C09K8/665C09K8/685C09K2208/12C09K2208/26
Inventor 刘通义魏俊戴秀兰林波陈光杰谭坤
Owner SOUTHWEST PETROLEUM UNIV
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