Adaptability of quartz sand for fracturing of Sulige tight sand gas reservoir

Kou Shuangfeng; Chen Shaoning; He Le; Liao Kuo

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Adaptability of quartz sand for fracturing of Sulige tight sand gas reservoir
Vol. 9, Issue 2, Pages: 65-70(2019)
Published：2019
DOI：
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DOI：

Kou Shuangfeng, Chen Shaoning, He Le, et al. Adaptability of quartz sand for fracturing of Sulige tight sand gas reservoir[J]. Petroleum Reservoir Evaluation and Development, 2019, 9(2): 65-70. DOI：

摘要

苏里格气田最小主应力在43 ~ 48 MPa

压裂使用的支撑剂一直都为20/40目中等强度陶粒。为评估石英砂替代陶粒的可行性

利用数值模拟、试井资料分析了裂缝导流能力的需求及现状

在此基础上通过室内实验对石英砂选型、石英砂与陶粒混合方式进行了研究

形成了相应方案并进行了现场试验。结果表明

①当前的裂缝导流能力为130 μm

·cm左右

高于I类储层94 μm

·cm、II类储层65 μm

·cm、III类储层25 μm

·cm的裂缝导流能力需求

石英砂用于压裂是可行的;②20/40目石英砂与陶粒进行均匀混合是较好的支撑剂组合方式

在闭合压力40 ~ 50 MPa、铺砂浓度10 kg /m

时

二者均匀混合比例为1∶0、7∶3、1∶1、3∶7的导流能力是陶粒的20 % ~ 46.7 %、23.9 % ~ 56.7 %、46 % ~ 74.6 %、73 % ~ 89.7 %;③对于I类储层石英砂与陶粒混合比例应小于1∶1

II类储层石英砂与陶粒混合比例应小于7∶3

III类储层可全部采用石英砂。

Abstract

The minor principal stress of Sulige gas field was between 43 ~ 48 MPa

while the proppant always used in fracturing was 20/40 mesh ceramic with moderate strength. In order to evaluate the feasibility of replacing the ceramsite with the quartz sand

we analyzed the demand and current situation of fracture conductivity by numerical modeling and well testing data. On this basis

we studied the selection of quartz sand and the mixed mode of quartz sand and ceramsite by indoor experiments

thus proposing the corresponding plan and carrying out the field tests. The results showed tha

firstly

the present fracture conductivity was about 130 μm

·cm

which was higher than the demand of the reservoir in class I（94 μm

·cm）

the reservoir in class Ⅱ（65 μm

·cm） and the reservoir in class Ⅲ（25 μm

·cm）. The quartz sand was available for fracturing. Secondly

the uniform mixing of the 20/40 mesh quartz sand and ceramsite was a good combination way of proppant. When the closing pressure was between 40 ~ 50 MPa and the proppant placement concentration was 10 kg/m

the conductivity of these who in the proportion of 1∶0

7∶3

1∶1

3∶7 respectively were 20 % ~ 46.7 %

23.9 % ~ 56.7 %

46 % ~ 74.6 %

73 % ~ 89.7 % of that of ceramsite. Thirdly

the optimal mixed proportion of quartz sand and ceramsite for the reservoir in class I should be below 1∶1. The optimal mixed proportion for the reservoir in class Ⅱ should be below 7∶3. The quartz sand could be used throughout for reservoir in class Ⅲ.