Shale gas fracturing stepping sand-adding method

A kind of air pressure and ladder technology, which is applied in the direction of earthwork drilling, production fluid, wellbore/well components, etc., can solve the problems of sand plugging, increase construction process and engineering cost, affect the effect of reservoir transformation, etc., and achieve enhanced effect and improved Liquid sand-carrying efficiency and the effect of increasing net pressure

Inactive Publication Date: 2017-04-26
重庆矿产资源开发有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] In the fracturing of shale gas reservoirs, the slug-type sand-adding process is often used, that is, pumping a sand-adding slug, and then pumping a liquid slug, so that the sand ratio gradually increases. The sand slug has a cons

Method used

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  • Shale gas fracturing stepping sand-adding method
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Examples

Experimental program
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Example Embodiment

[0016] Example one

[0017] Table 1 gives a detailed description of the step sand pump injection procedure (overview) for fracturing of a shale gas well.

[0018] This embodiment includes the following steps:

[0019] (1) Pumping the prefluid: use surface high-pressure pumping equipment to pump 120 cubic meters (6 wellbore volumes) of prefluid into the wellbore, and the liquid enters the formation to create fractures.

[0020] (2). Pump the first sanding slug. After the prefluid enters the formation to create fractures, start to add proppant quartz sand to the fracturing fluid to fill the fractures, with a sand liquid of 40 cubic meters (2 wellbore volumes) As a sanding slug, 62.5% of the volume before the first sanding slug is added with a sand ratio of 1%, and the sand ratio is constant, and 37.5% of the volume after the first sanding slug is added with a sand ratio of 2%.

[0021] (3). Inject the first liquid slug by pumping the fracturing fluid volume of 35 cubic meters (1.7 wellbo...

Example Embodiment

[0028] Example two

[0029] The stepwise sand adding method for fracturing in this embodiment is shown in the following table, and the pump injection procedure is as follows:

[0030]

[0031] This well is a shale gas horizontal well in the southeast of Chongqing. Through this stepped sand fracturing process, it can effectively predict the subsequent sand addition space of the wellbore passing through different formations, improve the efficiency of liquid sand carrying, and initially explore the effects of different formations. The critical sand addition point provides a reliable basis for subsequent drilling well trajectory design and fracturing plan design. At the same time, in the second sand addition slug, the construction pressure is stable and basically remains unchanged, indicating that the formation has good sand addition performance and increased To 3 different sand ratios, gradually increase in 1% increments, increase the amount of sand and liquid sand carrying efficiency...

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Abstract

The invention relates to a shale gas fracturing stepping sand-adding method which comprises the following steps: (1) pumping a prepared fluid into a shaft and causing the fluid enter into ground gaps; (2) pumping a first sand-adding section plug and performing the stepping sand adding; (3) pumping a first fluid section plug, and if the pressure shows as diagonal rising, confirming that the pressure change is mild and the sand ratio has a rising potential, and then skipping to the step (4), and if the pressure shows as the sand ratio rising unsuitable for the present stage, further pumping the fracturing fluid for forming gaps and then skipping to the step (1); (4) pumping a second sand-adding section plug and performing the stepping sand adding; (5) pumping a second fluid section plug and observing the pressure variation trend of the sand-adding section plug at different sand ratios after entering into the stratum; and (6) repeating the steps (4)-(5) for 15-20 times till meeting the requirement for designed fracturing sand-adding volume, completing the sand adding in each stage, and lastly, pumping the displacing liquid and completing the whole fracturing construction task. According to the invention, the stepping sand-adding method is adopted for effectively preventing reservoir sand blocking, reducing the construction risk and guaranteeing the smooth construction.

Description

technical field [0001] The invention relates to the technical field of shale gas exploration and development fracturing engineering, in particular to a stepwise sand adding method for shale gas fracturing. Background technique [0002] In the fracturing of shale gas reservoirs, the slug-type sand-adding process is often used, that is, pumping a sand-adding slug, and then pumping a liquid slug, so that the sand ratio gradually increases. The sand slug has a constant sand addition ratio, and the critical point of sand addition cannot be predicted, which may easily cause sand plugging, increase subsequent construction procedures and engineering costs, and affect the effect of reservoir stimulation. Contents of the invention [0003] In order to overcome the above-mentioned defects in the prior art, the object of the present invention is to provide a stepwise sanding method for shale gas fracturing, which can effectively prevent reservoir sand plugging and reduce construction ...

Claims

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Application Information

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IPC IPC(8): E21B43/267
CPCE21B43/267
Inventor 姚光华王晓泉董卫军廖金华邓洪军宜伟谭秀华熊鑫张宇周游
Owner 重庆矿产资源开发有限公司
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