Hydration induction pretreatment and judgment method before fracturing of shale reservoir

A shale reservoir and pretreatment technology, which is applied in earth-moving drilling, wellbore/well components, and production fluids, etc., can solve problems such as undiscovered fracture network, and the complexity of fracturing fracture network cannot fully meet production needs, etc. Achieve the effects of maximizing single well production, improving network complexity, and strong field operability

Active Publication Date: 2018-03-06
CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, relevant research at home and abroad is mainly focused on optimizing the main fracturing parameters (including pump injection displacement, type of pre-fluid, concentration of sand-carrying fluid, volume of sand-carrying fluid, type of proppant, etc.) to control the extension of hydraulic fractures...

Method used

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  • Hydration induction pretreatment and judgment method before fracturing of shale reservoir
  • Hydration induction pretreatment and judgment method before fracturing of shale reservoir
  • Hydration induction pretreatment and judgment method before fracturing of shale reservoir

Examples

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Effect test

Embodiment 1

[0028] The invention discloses an on-site construction process of hydration induction pretreatment before fracturing of shale reservoirs. figure 1 As shown, the method includes the following steps:

[0029] (1) Use cable or coiled tubing to perforate the i-section of the reservoir;

[0030] (2) Take out the cable or coiled tubing;

[0031] (3) Slowly increase the displacement and pump clean water into the wellbore for trial extrusion to ensure that the pumping pressure is lower than the safety pressure of the equipment and no large-scale fractures occur in the reservoir, and the maximum displacement does not exceed 5m 3 / min;

[0032] (4) Continuously pump a certain volume of clean water into the wellbore;

[0033] (5) Shut down the well after the clean water pumping is completed, and the shut-in time is longer than 15 hours;

[0034] (6) During the process of main fracturing to increase displacement, if there are multiple sudden drop points or pressure fluctuation zones i...

Embodiment 2

[0041] As the best implementation mode of the present invention, its steps are as follows:

[0042] (1) Carry the perforating gun through the cable or coiled tubing to complete the perforation of the target layer, and then pull out the cable or coiled tubing to avoid downhole complex situations such as perforating gun falling off or coiled tubing deformation.

[0043] (2) The initial displacement when pumping clean water is 0.5m 3 / min, observe the pressure change, gradually increase the displacement to 3m after the pressure is stable 3 / min, the rate of displacement does not exceed 0.25m 3 / min / min; if the construction pressure is low, the maximum displacement can be increased to 5m 3 / min, and ensure that the entire pumping process does not cause large-scale fractures in the reservoir. (attached figure 2 )

[0044] (3) The total volume of clean water pumped into the wellbore should be greater than 20% of the liquid volume in the design of the main fracturing scheme to ...

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Abstract

The invention discloses a hydration induction pretreatment and judgment method before fracturing of a shale reservoir. The hydration induction pretreatment and judgment method comprises the followingsteps that (1), a cable or a coiled pipe is adopted to conduct perforation operation on a first section of the reservoir; (2) the cable or the coiled pipe is taken out; (3) the displacement is slowlyincreased so as to pump clean water into a well shaft to conduct trial extruding, and the maximum displacement does not exceed 5m3/min; (4) the clean water is pumped in the well shaft continuously; (5) after the clean water is pumped, a well is closed to wait for generation of a hydration reaction, and the hydration time is determined to be 10-18 hours through an indoor core hydration experiment;and (6) judgment is conducted on the in-site effect of pretreatment. According to the hydration induction pretreatment and judgment method, pretreatment is conducted on the shale reservoir before construction of main fracturing, thus the complexness of the fracture network of reservoir fracturing can be further improved, the seepage channels of reservoir fluid are increased, the seepage resistanceof the liquid is reduced, and achievement of yield maximization of a single well is facilitated. The method is high in in-site operability, and low in operation cost.

Description

technical field [0001] The invention relates to a new pretreatment method for increasing the complexity of reservoir fracturing fractures in the technical field of unconventional reservoir stimulation and transformation, in particular to a reservoir pretreatment and field effect evaluation method for increasing the complexity of shale reservoir fractures. Background technique [0002] The "Shale Gas Development Plan (2016-2020)" clearly proposes to perfect and mature shallow marine shale gas exploration and development technology below 3,500 meters, and to break through the exploration of deep marine shale gas, continental and marine-continental transitional shale gas exploration below 3,500 meters Develop technology; with policy support in place and market development going smoothly, strive to achieve 30 billion cubic meters of shale gas production in 2020. [0003] Hydraulic fracturing technology is a key technology for exploiting shale gas, and the complexity of the fract...

Claims

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Application Information

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IPC IPC(8): E21B43/26
CPCE21B43/26
Inventor 朱炬辉杨海钱斌李军龙王丹石孝志管彬欧维宇韦杰
Owner CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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