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Adjustable-crack type temporary plugging acid fracturing steering performance testing device and evaluation method

A technology of steering performance and testing equipment, which is applied in the direction of earthwork drilling, production fluid, wellbore/well components, etc. It can solve the problems that the limitation of fracture size cannot evaluate the position of bridging formed by temporary plugging agent, so as to improve accuracy, The effect of accurate test results

Active Publication Date: 2018-06-01
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a crack-adjustable temporary plugging acid fracturing performance test device and evaluation method to solve the limitations of the existing experimental methods on the crack size and the inability to evaluate the bridge plugging position of the temporary plugging agent

Method used

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  • Adjustable-crack type temporary plugging acid fracturing steering performance testing device and evaluation method
  • Adjustable-crack type temporary plugging acid fracturing steering performance testing device and evaluation method
  • Adjustable-crack type temporary plugging acid fracturing steering performance testing device and evaluation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The simulated crack in this embodiment is a wedge-shaped crack, the size of the exit is 3 mm, the size of the crack at the entrance is 5.1 mm, the lower wall of the crack is parallel to the horizontal plane, the angle between the upper wall and the horizontal plane is 0.5 degrees, and the crack shape is a wedge-shaped crack;

[0037] Preparation of thickened acid solution: 0.6% polymer thickener + 15% HCl + 1% corrosion inhibitor, tested by HAAKE rheometer at 140°C, 170S -1 Its apparent viscosity is stable at 50mPa.s;

[0038] The temporary plugging agent is made of polyester fibers with a fiber length of 6 mm and an addition ratio of 1.5 wt%, which is dispersed in the thickened acid solution by high-speed stirring;

[0039] Set the temperature of the acid tank and the simulated crack temperature to 140°C, and the displacement of the plunger pump 3 to 220ml / min;

[0040] After starting the pump for a period of time, the pressure starts, and then the pressure rises to a c...

Embodiment 2

[0043] The experimental conditions of this example are basically the same as those of Example 1, except that the temporary plugging agent is: 1.5wt% polyester fibers + 0.5wt% polyester temporary plugging particles (average diameter: 2mm).

[0044] For wider fractures, the temporary plugging strength of pure fiber plugging agent is not enough, consider compounding rigid temporary plugging particles to increase the temporary plugging strength. Figure 4 It shows that 1.5wt% polyester fibers + 0.5wt% polyester temporary plugging particles (average diameter is 2mm) plug the wedge-shaped cracks in Example 1. After the plugging pressure reaches 22MPa, the safety valve automatically opens the pressure relief protection system . The experimental results show that the combination of rigid particles can significantly enhance the plugging strength.

Embodiment 3

[0046] The setting of the size and shape of the simulated crack in this embodiment: its shape is wedge-shaped, and three types of cracks of 8 sizes are set in the following table 1. For the convenience of marking, the cracks of each size take the size of the outlet end as the recording standard, i.e. 0.5, 1 , Eight sizes of 2, 3, 4, 6, 7, 8mm.

[0047] Table 1

[0048]

[0049] Thickened acid preparation: 0.6% polymer thickener + 15% HCl + 1% corrosion inhibitor, tested by HAAKE rheometer at 140°C, 170S-1, its apparent viscosity is stable at 50mPa.s;

[0050] The temporary plugging agent is made of polyester fibers with a fiber length of 6 mm and an addition ratio of 1.5 wt%, which is dispersed in the thickened acid solution by high-speed stirring;

[0051] Set the acid tank temperature and simulated crack temperature to 140°C;

[0052] Displacement settings are 50, 100, 150, 200, 250, 300, 350, 400, 500, 600, 700ml / min, a total of 11 displacements;

[0053] A total of 8...

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Abstract

The invention discloses an adjustable-crack type temporary plugging acid fracturing steering performance testing device and an evaluation method, and belongs to the technical field of the petrochemical industry. The adjustable-crack type temporary plugging acid fracturing steering performance testing device includes a water storage tank, a plunger pump, an acid liquid tank, an adjustable simulatedcrack device, a filtrate metering electronic balance, and a computer control system which are sequentially connected. According to the adjustable-crack type temporary plugging acid fracturing steering performance testing device, a simulated crack is adjustable in size and form, and a parallel crack and a wedge-shaped crack of 0.5-8mm can be simulated; and both the simulated crack and temporary plugging acid liquid are heated to simulate the formation temperature, and the effect law of the crack size, shape, and the formation temperature on the temporary plugging effect can be studied. The effect of temporary plugging is mainly evaluated in performance by observing the change of upstream and downstream pressure difference, the filter loss, and the formation position of bridge blinding.

Description

technical field [0001] The invention relates to the technical field of petrochemical industry, in particular to a crack-adjustable temporary plugging acid fracturing steering performance testing device and an evaluation method. Background technique [0002] In carbonate reservoirs with well-developed natural fractures, conventional acid fracturing will lead to the inability to start pressure at the bottom of the well due to a large amount of fluid loss, thus making it impossible to uniformly distribute acid or form new fractures. In order to achieve uniform acid distribution and diverting acid fracturing, the temporary plugging and diverting agent of fiber particles is uniformly dispersed in the acid liquid or preflush and pumped into the formation, and the temporary plugging agent of fiber particles forms a bridge in natural fractures or formed artificial channels. Blocking, reduce fluid loss, and start pressure upstream of bridge plugging to realize turning acid fracturing...

Claims

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Application Information

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IPC IPC(8): E21B43/27E21B49/00
CPCE21B43/26E21B49/00
Inventor 毛金成张文龙宋志峰卢伟范津铭赵金洲
Owner SOUTHWEST PETROLEUM UNIV
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