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Method for measuring breakage rate of propping agent

A measurement method and proppant technology, which is applied in the direction of measuring devices, earthwork drilling, mining fluids, etc., can solve the problem of not considering the fracture, not considering the difference in fracture rate between dry and wet samples of proppant, and not truly reflecting the fracture rate of proppant and other problems, to achieve the effect of real broken rate results and better broken rate results

Active Publication Date: 2021-08-06
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Generally speaking, the existing evaluation method of proppant fracture rate does not consider the difference in fracture rate between dry and wet samples of proppant, and does not consider new fractures during fracturing construction. The measured proppant fracture rate is ideal. One-sided, cannot truly reflect the fracture rate of proppant in fracturing

Method used

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  • Method for measuring breakage rate of propping agent
  • Method for measuring breakage rate of propping agent
  • Method for measuring breakage rate of propping agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Embodiment one: if Figure 2 to Figure 4 As shown, a device for measuring proppant fragmentation rate includes: delivery unit 4, stirring unit 5, first pumping unit 6, pressure-bearing unit 3, second pumping unit 2, data recording control unit 7, screening unit.

[0055] The delivery unit 4 is composed of a first cylinder 404 , a first piston 403 and a first top cover 402 . The first cylinder 404 can bear pressure for simulating a wellbore. There is a screw on the upper part of the first cylinder 404, and the first cylinder 404 is combined with the first top cover 402 through the screw; the lower side has a hole for simulating bottom hole injection. hole (during fracturing construction, the proppant is perforated from the bottom of the well into the formation), the hole is not polished, and the first pipe joint 401 is set at the opening, and the first pipe joint 401 is connected to the first pumping unit 6 through a pipeline. And a valve 8 is installed at the opening;...

Embodiment 2

[0062] Embodiment two: if figure 1As shown, this embodiment is further optimized on the basis of Example 1, a method for measuring a proppant fragmentation rate measuring device, comprising the following steps:

[0063] Step 1: Prepare the mixed solution of fracturing fluid and proppant, and put the mixed solution into the delivery unit 4;

[0064] Step 2: stirring the mixed solution in the delivery unit 4;

[0065] Step 3: pump the stirred mixed solution into the pressure-bearing unit 3;

[0066] Step 4: Pressurize the mixed liquid in the pressure-bearing unit 3 for a certain period of time;

[0067] Step 5: After bearing pressure for a certain period of time, the mixed fluid in the pressure bearing unit 3 is reversely drained to discharge the liquid;

[0068] Step 6: After draining, pressurize the proppant in the pressure-bearing unit 3 for a certain period of time;

[0069] Step 7: Collect the proppant after the second pressurization, and calculate the fracture rate.

...

Embodiment 3

[0085] Embodiment three: this embodiment carries out experiment on the basis of embodiment two:

[0086] This embodiment provides a calculation formula for converting on-site construction displacement into indoor experimental flow, as described in the following formula:

[0087]

[0088] In the formula: Q 施工 —— On-site construction displacement, m 3 / min;

[0089] V 总 ——The total amount of on-site construction medium, m 3 ;

[0090] t 总 ——total construction time on site, min;

[0091]

[0092] In the formula: Q 实验 ——Indoor experimental flow rate, mL / min;

[0093] V' 总 ——The total amount of indoor experimental medium, mL;

[0094] t' 总 ——Total time of indoor experiment, min;

[0095] Q=v×s------------------------------------------(3)

[0096] In the formula: Q——the flow rate in a specific time, m 3 / s;

[0097] v——flow velocity in the pipeline, m / s;

[0098] s——the cross-sectional area of ​​the pipe, m 2 ;

[0099] The experimental simulation parameter s...

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Abstract

The invention provides a method for measuring the breakage rate of a propping agent. The method comprises the following steps: step 1, preparing mixed liquid of fracturing fluid and the propping agent, and putting the mixed liquid into a conveying unit; step 2, stirring the mixed liquid in the conveying unit; step 3, pumping the stirred mixed liquid into a pressure bearing unit; step 4, enabling the mixed liquid in the pressure bearing unit to be subjected to pressure bearing for a certain time; step 5, after bearing pressure for a certain time, performing accumulated liquid reverse drainage on the mixed liquid in the pressure bearing unit, and discharging the liquid; step 6, after liquid discharging, enabling the propping agent in the pressure bearing unit to be subjected to pressure bearing for a certain time; and step 7, collecting the propping agent subjected to pressure bearing for the second time, and calculating the breakage rate. By adopting the scheme, the real breakage rate of the propping agent in fracturing can be directly evaluated, and powerful experimental technical support is provided for propping agent optimization and performance evaluation in the fracturing construction design process.

Description

technical field [0001] The invention relates to the technical field of oil and gas field development, in particular to a method for measuring proppant fragmentation rate. Background technique [0002] In the development of existing oil and gas fields, because the deep underground rock fractures are very dense, resulting in low oil and gas recovery efficiency, therefore, it is necessary to manpower to fracture the underground rock fractures, and fill the fractures with proppant to form underground oil and gas channels, which can be more efficient exploitation of oil and gas fields. Hydraulic fracturing is one of the main technologies for efficient development of oil and gas fields, and its fundamental goal is to form fractures with high conductivity in the formation. However, due to the fracturing process and the effect of formation closure pressure, the proppant will be broken. The broken proppant will reduce the width of propped fractures, and debris particles will block t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/267G01N33/00G09B25/02
CPCE21B43/267G01N33/00G09B25/02
Inventor 高新平范宇张华礼彭钧亮韩慧芬彭欢曾冀周玉超殷悦琳王晓娇
Owner PETROCHINA CO LTD
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