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An experimental device and experimental method for crack plugging simulation

The technology of an experimental method and experimental device, which is applied in the field of oil drilling testing, can solve the problems of comprehensively evaluating the plugging effect of the plugging material and the pressure bearing capacity of the plugging layer, and achieve the effect of improving the effectiveness of the experiment

Active Publication Date: 2021-11-02
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide a kind of experimental device and experimental method of fracture plugging simulation, consider factors such as the influence of pressure fluctuation on the plugging process in the real drilling process, in order to solve the experimental device and its experimental method of existing fracture plugging simulation. The experimental method cannot really be used to comprehensively evaluate the plugging effect of the plugging material and the pressure bearing capacity of the plugging layer

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  • An experimental device and experimental method for crack plugging simulation

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Embodiment 1 provides an experimental device for crack plugging simulation, and the structure will be described in detail below.

[0049] refer to figure 1 , the experimental device for simulation evaluation of fracture plugging includes a main circulation loop, a first branch 61 and a second branch 62 .

[0050] The main circulation circuit includes a plugging mud tank 1, a formation water tank 2, an upper circulation pipeline 3, a lower circulation pipeline 4, a crack plugging simulator 5, a mud pump 31, a pulse solenoid valve 32 and a computer 33.

[0051] The crack plugging simulator 5 is provided with a long and narrow penetrating crack 51, the penetrating crack 51 includes a penetrating crack liquid inlet 511, a penetrating crack liquid outlet 513 and a crack channel 512, the penetrating crack liquid inlet 511 is thick, and the penetrating crack liquid outlet 513 is small, and the liquid inlet port 511 and the liquid outlet port 513 through the crack are respecti...

Embodiment 2

[0067] Embodiment 2 provides an experimental method for simulating formation water erosion of fractures and fracture surfaces until saturated. The experimental device for simulated evaluation of crack plugging in Embodiment 1 is used. The liquid return control valve 12 of the slurry tank, the liquid discharge control valve 21 of the formation water tank, the liquid return control valve 22 of the formation water tank, the first valve 71, the second valve 72, the third valve 73 and the fourth valve 74 are all in the closed state, Through this experimental method, formation water can be injected into the fracture plugging simulator 5 until the fracture plate 50 is saturated, which is used to simulate the process of formation water injected into the pores of the fracture plate 50 until saturation under the action of a constant pressure difference, specifically including the following steps:

[0068]Step A1: Open the liquid outlet control valve 21 of the formation water tank, the fo...

Embodiment 3

[0074] Embodiment 3 provides an experimental method for simulating dynamic leakage plugging slurry to seal cracks while maintaining a constant pressure difference on both sides of the leakage plugging layer 100. The experimental device for simulation evaluation of crack plugging in Embodiment 1 is used, and the simulation method provided in Embodiment 2 After the experimental method of formation water eroding fractures and fracture surfaces until saturated, the following steps are specifically included:

[0075] Step B1: sequentially open the plugging slurry tank liquid outlet control valve 11, the first valve 71, the plugging slurry tank liquid return control valve 12 and the second valve 72;

[0076] Step B2: set the pressure values ​​of the second back pressure valve 92 and the third back pressure valve 93 to 0.5P, ie 1.5MPa, and set the pressure value of the first back pressure valve 91 to 1.5P, ie 4.5MPa;

[0077] Step B3: Turn on the mud pump 31, and the plugging slurry ...

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Abstract

The invention discloses an experimental device and an experimental method for crack plugging simulation. The device includes a main circulation loop and a first branch. The main circulation loop includes a plugging slurry tank, a formation water tank, an upper circulation pipeline, and a lower circulation loop Pipeline, crack plugging simulator and pulse solenoid valve. The experimental method includes the experimental method of simulating the formation water erosion of the fracture and the fracture surface until saturated, and the simulation of dynamic plugging slurry sealing the crack while maintaining a constant pressure difference on both sides of the plugging layer. Experimental methods, experimental methods for simulating drilling fluid scouring the plugging layer, experimental methods for evaluating the plugging effect of plugging slurry in sealing fractures, etc. The invention discloses an experimental device and an experimental method for crack plugging simulation, capable of carrying out forward and reverse pressure bearing tests and pressure bearing capacity tests under alternating positive and negative effects on the leak plugging layer formed in penetrating cracks , to truly evaluate the plugging capacity of the plugging slurry during the simulated drilling process and the continuous plugging capacity of the plugging layer after the plugging is completed, and then evaluate the plugging effect of the plugging material.

Description

technical field [0001] The invention relates to an experimental method for oil drilling testing, in particular to an experimental device and an experimental method for crack plugging simulation. Background technique [0002] Lost circulation is the phenomenon that various working fluids such as drilling fluid, cement slurry, completion fluid and other fluids leak into the formation under the action of pressure difference during various downhole operations such as drilling, cementing, and logging. Drilling fluid loss is a common downhole complication in drilling operations. Lost circulation can occur in shallow, medium and deep layers, and can also occur in different geological ages such as from the Quaternary to the Paleozoic. Moreover, it may appear in strata of various lithologies. [0003] Once leakage occurs, not only the drilling time will be delayed, the drilling fluid will be lost, and the geological logging work will be disturbed, but it may also cause a series of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N33/00
CPCG01N33/00
Inventor 马成云冯永存李晓蓉邓金根罗超
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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