Crack particles diversion agent temporary blockage capability evaluation apparatus and method thereof

An evaluation device and diverting agent technology, applied in the field of petroleum fracturing, can solve the problems of limited fracture scale, inability to simulate fracture conditions, poor fracture repeatability, etc., and achieve the effects of high degree of automation, favorable operation and high operation efficiency

Active Publication Date: 2015-04-22
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the current technology for evaluating the plugging capacity of fracture diverting agents is relatively lagging behind. Single-tube or parallel-connected double-tube cores or sand-packing model flow simulation experimental devices are used to qualitatively evaluate the plugging capacity of diverting agents. However, fracture conditions cannot be simulated, and due to injection problems Problems such as particle type and fiber type diverting agent plugging cannot be simulated
The patent application number 201110325821.9 discloses a test method for the breakthrough pressure of refracturing plugging agent, which uses the method of core splitting and fracture filling to simulate the plugging agent plugging strength, but there are problems such as complicated core production process, poor fracture repeatability, and fracture failure. Limited scale (standard core size is small) and plugging agent cannot be dynamically injected, which is far from the fracture temporary plugging process in the actual fracturing process

Method used

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  • Crack particles diversion agent temporary blockage capability evaluation apparatus and method thereof
  • Crack particles diversion agent temporary blockage capability evaluation apparatus and method thereof
  • Crack particles diversion agent temporary blockage capability evaluation apparatus and method thereof

Examples

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Effect test

Embodiment 1

[0034] In order to truly simulate the field practice, accurately measure the plugging pressure of the fracture diverting agent, and obtain the evaluation index of the temporary plugging ability of the fracture diverting agent, this embodiment provides the following figure 1 The device for evaluating the temporary blocking ability of a crack particle diverting agent includes a constant temperature box 2, in which a clamper outer cylinder 25 is arranged, and a rubber cylinder 13 is built in the clamper outer cylinder 25, which is clamped The outer cylinder 25 of the holder and the rubber cylinder 13 form a closed space, and the two ends of the outer cylinder 25 of the holder are provided with an inlet end plug 9 and an outlet end plug 23, between the inlet end plug 9 and the outlet end plug 23 There are upper and lower symmetrical crack blocks 12 in a V-shaped channel. The crack blocks 12 are arranged in the rubber cylinder 13 and are sealed and fixedly connected between the inle...

Embodiment 2

[0041] Based on the basis of Example 1, each of the symmetrical crack blocks 12 is composed of a long block 1201 and a short block 1202 connected by the middle rotating shaft 14, and the long block 1201 and the The outlet plug 23 is flexibly connected, and the short block 1202 is flexibly connected to the inlet plug 9 .

[0042] The crack system is composed of four crack blocks 12, block rotating shaft 10, block rotating shaft 14, and block rotating shaft 21. The four block sections at the middle rotating shaft 14 are all processed into slopes with a certain angle, so as to ensure that the cracks are closed. A certain activity space, the surface of the four crack blocks 12 in contact with the rubber cylinder 13 is processed to have a certain angle of inclination to both ends, so as to ensure the upturned activity space at both ends of the block when the crack is closed; two long blocks 1201 is the main part of the simulated crack. Under normal circumstances, the opening of...

Embodiment 3

[0048] Based on Embodiment 1 and Embodiment 2, this embodiment provides a method for evaluating the temporary plugging ability of a fracture particle diverting agent, which includes the following steps:

[0049] (1) Check the integrity of the evaluation device for the temporary plugging capacity of the fracture particle diverting agent, and open the constant temperature box 2 to simulate the formation temperature;

[0050] (2) Place the fracturing fluid pre-fluid in the working fluid storage tank 6, and place the required mixture of steering agent and fracturing fluid in another working fluid storage tank 6; The mixing volume ratio of steering agent and fracturing fluid is 10-30:90-70;

[0051] (3) According to the actual situation of the reservoir, the rubber cylinder 13, the fracture block 12 and the rock The crack system holder 23 composed of the plate 20 is applied with ring pressure to reach 30-60MPa simulated crack closure pressure;

[0052] (4) Set the pressure val...

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Abstract

The invention discloses a crack particles diversion agent temporary blockage capability evaluation apparatus and a method thereof. The crack particles diversion agent temporary blockage capability evaluation apparatus comprises a thermotank, a holder outer cylinder is arranged in the thermotank, a rubber cylinder is arranged in the holder outer cylinder, the holder outer cylinder and the rubber cylinder form an enclosed space, an inlet end blocking head and an outlet end blocking head are arranged at two ends of the holder outer cylinder, an annular pressure hole is arranged at central section of the holder outer cylinder, an annular pressure meter is conducted to the enclosed space formed by the holder outer cylinder and the rubber cylinder by the annular pressure hole, and the other end of the annular pressure meter is connected to an annular pressure pump and an annular pressure liquid storage tank in order. The crack particles diversion agent temporary blockage capability evaluation apparatus establishes the crack particles diversion agent temporary blockage capability evaluation method which integrates steps of liquid preparation, pressure testing, injection and pressure measuring, as well as is matched with the experiment apparatus, a crack particles diversion agent temporary blockage process can be simulated, the operation is safe and simple, and automation degree and result credibility are high.

Description

technical field [0001] The invention relates to a device and method for evaluating the temporary plugging ability of a fracture particle diverting agent, belonging to the field of petroleum fracturing. Background technique [0002] With the continuous consumption of conventional oil and natural gas resources, the strategic position and role of low-permeability oil and gas resources in my country's energy structure has become increasingly prominent. Hydraulic fracturing, as the main measure for putting oil and gas wells into production or increasing production, has been widely used in the development of low-permeability oil and gas fields, and has made important contributions to the high and stable production of oil and gas fields. However, affected by many factors, the initial hydraulic fracturing of some production wells is inefficient or ineffective, seriously affecting the normal development of oil and gas fields. For such wells, in order to obtain high production and eco...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/00
Inventor 许洪星王祖文张冕廖乐军池晓明高红平李燕红郭艳萍纪冬冬杨燕
Owner BC P INC CHINA NAT PETROLEUM CORP
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