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Combined proppant flow guiding capacity predicting method

A technology of conductivity and prediction method, applied in drilling composition, chemical instruments and methods, measurement, etc., can solve the problems of easily broken proppant, inability to provide high fracture conductivity, sand plugging, etc., to save The effect of human and material resources

Inactive Publication Date: 2020-04-03
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, most of the proppants used in oil fields are proppants with a single particle size. The proppant with a single large particle size in complex oil wells can provide high fracture conductivity, but it may be difficult to add sand during construction, and it is easy to cause sand. and the proppant is easily broken under long-term high closure pressure, which cannot provide long-term and effective high fracture conductivity; if a single small particle size proppant is used, although it can meet the requirements of construction and resistance to high closure pressure, but due to the The diameter is small, so it cannot provide enough fracture conductivity, and the stimulation effect is not good

Method used

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  • Combined proppant flow guiding capacity predicting method
  • Combined proppant flow guiding capacity predicting method
  • Combined proppant flow guiding capacity predicting method

Examples

Experimental program
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Effect test

Embodiment 1

[0073] The combined proppant is composed of 16 / 30 mesh proppant 1 and 20 / 40 mesh proppant 2, and the flow conductivity of the proppant 1 and proppant 2 is as follows: figure 2 and as shown in Table 1:

[0074] Table 1 The conductivity of proppant 1 and proppant 2

[0075]

[0076] Calculate the conductivity values ​​of 16 / 30 mesh proppant 1 and 20 / 40 mesh proppant 2 at different ratios according to formula (1), and compare them with the actual test conductivity values. The results are as follows Figure 3-6 and as shown in Table 2:

[0077] Table 2 Comparison of calculated and tested values ​​of combined proppant conductivity under different proportions

[0078]

[0079]

[0080] As can be seen from the data in Table 2, the difference between the combined proppant conductivity calculated by the present invention and the actual test conductivity is very small, the largest being 20% ​​16 / 30 mesh proppant one and 80% 20 / 40 For the combination of proppant 2, the error...

Embodiment 2

[0082] It is known that the optimal conductivity of propped fractures in Well W1 is 4.48D cm, and the fractures in Well W1 are supported by a combination of proppants. The optimal conductivity is based on the optimal productivity of Well W1, and numerical simulation From software simulation, the combined proppant is composed of 30 / 50 mesh proppant 1 and 40 / 70 mesh proppant 2, 3kg / m 2 Proppant 1 has a conductivity of 5.17D·cm, 5kg / m under the condition of closure stress of 46.5MPa 2 The conductivity of proppant 2 under the condition of closure stress of 46.5MPa is 4.42D cm, and the ratio of proppant 1 to proppant 2 is 9:91 calculated according to formula (7) and formula (8).

[0083] According to the well logging data, there are secondary fractures in Well W1, and the fractures are supported by powder pottery, and the proportion of the proppant in the powder pottery can be determined according to the ratio of secondary fractures to primary fractures. The formula for calculatin...

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Abstract

The invention discloses a combined proppant flow guiding capacity predicting method. A combined proppant is composed of a proppant I and a proppant with different particle sizes, and the flow guidingcapacity of the combined proppant is calculated according to the flow guiding capacity of the proppant I and the proppant II and the proportions of the proppant I and the proppant II in the combined proppant. The flow guiding capacity of the combined proppant can be accurately calculated, and important data support is provided for hydraulic fracturing.

Description

technical field [0001] The invention relates to the technical field of oilfield chemistry in the enhanced crude oil recovery technology, in particular to a method for predicting the flow conductivity of a combined proppant. Background technique [0002] Hydraulic fracturing is an important technology for reservoir reconstruction. In hydraulic fracturing technology, in order to keep the fractures open, the sand-carrying fluid with proppant is squeezed into the oil layer. After the sand-carrying fluid enters the fracture, On the one hand, it makes the cracks continue to extend forward, on the other hand, it supports the cracks that have been opened so that they will not close. Therefore, the conductivity of the proppant directly affects the effect of hydraulic fracturing. [0003] At present, most of the proppants used in oil fields are proppants with a single particle size. The proppant with a single large particle size in complex oil wells can provide high fracture conducti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/267E21B47/00C09K8/80
CPCE21B43/267E21B47/00C09K8/80
Inventor 赵志红张鑫郭建春尹启武刘学伟
Owner SOUTHWEST PETROLEUM UNIV
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