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A method for fracturing through mudstone layers in horizontal wells

A horizontal well and mudstone technology, applied in the field of oil production technology in oil fields, can solve the problems of construction failure, narrow crack width and high fracture pressure, and achieve the effect of avoiding sand plugging

Active Publication Date: 2017-07-25
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the characteristics of high stress, strong plasticity, high fracture pressure, narrow width of fractures formed in mudstone formations, and large differences in properties between sandstone and mudstone layers, cracks of effective width cannot be formed due to small current liquid ratio and small displacement, resulting in In the case of passing liquid but not sand, it is easy to cause sand blockage at the seam, resulting in construction failure
It can be seen that in the prior art, there is no effective method to solve the problem of mudstone penetration fracturing in horizontal wells.

Method used

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  • A method for fracturing through mudstone layers in horizontal wells
  • A method for fracturing through mudstone layers in horizontal wells

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Experimental program
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Effect test

Embodiment 1

[0044]The mudstone penetration fracturing method of the horizontal well in this embodiment: for the fracturing characteristics of unknown formations, the step test fracturing technology is firstly used to analyze the extension characteristics of mudstone fractures, and to understand the extension pressure, closure pressure and the fluid loss characteristics of the formation. For the main sand fracturing construction, the following technical measures are taken, and the pumping procedures are as follows: figure 1 shown.

[0045] In the initial stage of fracturing, start the fracturing crew quickly, and inject fracturing fluid with a displacement of 4.0m within 15 seconds 3 / min, the pressure is suppressed in the wellbore, causing the formation to crack rapidly.

[0046] In the pre-fluid stage, the pre-fluid is injected to expand the fracture, and the injection volume of the pre-fluid is 45% (v / v) of the total injection volume of the fracturing fluid, so that the fracture is ful...

Embodiment 2

[0050] For the main sand fracturing construction, take the following technical measures:

[0051] In the initial stage of fracturing, start the fracturing crew quickly, and inject fracturing fluid displacement to reach 4.5m within 12 seconds 3 / min, the pressure is suppressed in the wellbore, causing the formation to crack rapidly.

[0052] In the pre-fluid stage, the pre-fluid is injected to expand the fracture, and the injection volume of the pre-fluid is 45% (v / v) of the total injection volume of the fracturing fluid, so that the fracture is fully extended in length and height, providing support The laying of the agent provides conditions and expands the oil drainage area of ​​the fracture. At the same time, in the preflush stage, 5% (v / v) and 7% (v / v) ceramsite slugs with a particle size between 40 and 70 mesh were added to the preflush to polish the crack wall.

[0053] In the sand-carrying liquid stage, the sand ratio is 8%-10%-12%-14%-16%-18% (v / v) in a stepwise manne...

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Abstract

The invention relates to a mudstone layer-crossing fracturing method for a horizontal well. This method takes the following measures in the main fracturing: (1) quickly start the fracturing fluid delivery device; (2) inject the fracturing fluid with a large displacement; (3) inject a large amount of prefluid to expand the fracture; Proppant; (5) Low sand ratio with stepwise increase. The method of the present invention successfully solves the purpose of connecting the upper and lower reservoirs through mudstone interbedded fracturing, ensures the success of fracturing construction in horizontal wells with interbedded sandstone and mudstone, transforms the upper and lower sandstone oil and gas layers to a greater extent, and greatly improves the construction efficiency. The success rate and the effective utilization of reserves have achieved significant economic benefits. The method of the invention has reasonable design, simple construction technology, convenient operation, high fracturing construction success rate and obvious construction effect, and has broad application prospects in the fracturing of sand-shale interbedded horizontal wells.

Description

technical field [0001] The invention belongs to the technical field of oil recovery technology in oilfields, and relates to an effective method for penetrating mudstone interlayers and communicating with sandstone reservoirs in the fracturing process of horizontal wells to improve post-fracturing effects. Background technique [0002] With the continuous development of drilling technology and downhole tools, horizontal well staged fracturing technology has become the leading technology for developing low-permeability oil and gas fields. The staged fracturing of horizontal wells not only needs to ensure the success of each stage of fracturing, but the key is to increase the production of single well through multi-stage fracturing, so as to improve the development effect, otherwise the development of horizontal wells will have no economic benefits at all. [0003] Due to complex changes in regional deposition, some blocks have strong lateral and vertical heterogeneity, and mul...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/267
Inventor 秦钰铭陈作王宝峰徐胜强吴春方刘世华刘建坤
Owner CHINA PETROLEUM & CHEM CORP
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