Reservoir permeability-increasing method of water pressure blasting crack initiation and CO2 carried with proppant fracturing

A technology of hydraulic blasting and proppant, which is used in earth-moving drilling, wellbore/well components, and production fluids, etc., can solve problems such as inability to achieve the effect of increasing permeability, achieve rapid cleaning, solve permanent storage, and save water resources Effect

Inactive Publication Date: 2016-01-06
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although conventional anti-reflection methods can play a certain role in some links of anti-reflection, they still cannot achieve the ideal anti-reflection effect.

Method used

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  • Reservoir permeability-increasing method of water pressure blasting crack initiation and CO2 carried with proppant fracturing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1, see figure 1 , a hydraulic blasting crack-CO 2 The reservoir permeability enhancement method of fracturing with proppant is applied to the following coalbed methane reservoir, the dip angle is 14°, the average thickness is 5m, and the permeability distribution is 0.001~2.398×10 -3 μm 2 Between, the average value is 0.43×10 -3 μm 2 . Ground drilling is used to extract coalbed methane, and the designed well type is a vertical well type. The two-open well body structure scheme is adopted, and the specific implementation is carried out according to the following steps.

[0031] The first opening uses a φ311.1mm drill bit, and after drilling through the bedrock weathered zone for 20 meters, the φ244.5mm surface casing 4 is lowered, and the cement mortar 7 is injected between the surface casing 4 and the φ311.1mm drill hole. 7. Lift back to the ground surface to seal the surface loose layer and gravel layer and establish the wellhead.

[0032] The second ope...

Embodiment 2

[0036] Example 2, see figure 1 , a hydraulic blasting crack-CO 2 The reservoir permeability enhancement method of fracturing with proppant is applied to the target layer of the following shale gas reservoirs, and the shale gas is extracted by ground drilling. Select the "roller cone bit + screw" composite drilling technology, design the "three times" wellbore structure plan, and implement it according to the following steps.

[0037] In the first opening, the φ444.5mm drill bit was used to drill 200m, and the φ339.7mm surface casing 4 was lowered, and the interpolation cementing process of the cement mortar filling method as described in Example 1 was adopted to return the cement mortar 7 to the ground to establish Wellhead.

[0038] The second opening uses a φ311.1mm drill bit to drill to the shale gas layer, lower the φ244.5mm technical casing 6, and return the cement mortar 7 to the ground.

[0039] In the third opening, a φ215.9mm drill bit is used to drill shale gas re...

Embodiment 3

[0043] Example 3, see figure 1 , a hydraulic blasting crack-CO 2 The reservoir permeability enhancement method of fracturing with proppant is applied to the following crude oil reservoir, which is a low porosity and low permeability reservoir. The porosity of conventional core analysis is 7.5% to 12.9%, with an average of 9.54%. is 0.0667×10 -3 μm 2 ~1.47×10 -3 μm 2 , with an average of 0.486×10 -3 μm 2 ; The porosity measured by mercury intrusion analysis is 8.3% to 13.9%, with an average of 11.24%, and the permeability is 0.112×10 -3 μm 2 ~7.96×10 -3 μm 2 , with an average of 0.954×10 -3 μm 2 . The design well depth is 2060m, and the shaft structure is designed in two schemes, which are implemented according to the following steps.

[0044] In the first opening, a φ311.2mm drill bit is used to drill 81m, and the φ244.5mm surface casing 4 is lowered, and the cement mortar 7 is returned to the ground to establish a wellhead.

[0045] In the second opening, a φ215...

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Abstract

The invention discloses a reservoir permeability-increasing method of water pressure blasting crack initiation and CO2 carried with proppant fracturing. The method comprises the steps of charging, water injection and hole sealing, water pressure blasting and supercritical or liquid-state CO2 fracturing, wherein well drilling and well cementation are conducted before charging, and well drilling is formed by means of a production casing; when necessary, at least one intermediate casing is arranged between a surface casing and a production casing; before fracturing is conducted, by means of a sand mixing pump, fully mixing is conducted on ceramsite proppant and supercritical or liquid-state CO2 according to the set ratio, and necessary additives are added to form spare fracturing fluid; during the fracturing, real-time monitoring on fracture extending is conducted by means of a microseismic monitor to monitor the range of influence of cracks accurately. The reservoir permeability-increasing method of water pressure blasting crack initiation and CO2 carried with proppant fracturing has the advantages that advantages that two types of permeability-increasing methods are fully utilized, permeability characteristics of a low-permeability oil-gas reservoir are effectively improved, oil and gas production is greatly improved, the service life of an oil and gas well is prolonged, and safety, effectiveness and green and environmental protection are achieved.

Description

technical field [0001] The invention relates to a method for increasing permeability of oil and gas reservoirs, in particular to a hydraulic blasting cracking-CO 2 Reservoir permeability enhancement method for fracturing with proppant. Background technique [0002] The permeability of the reservoir is the main index to evaluate the quality of the reservoir, and it is also one of the key research topics in the field of oil and gas exploitation. In particular, low-permeability oil and gas reservoirs have attracted the attention of oil and gas engineers and technicians because of their huge reserves, relatively concentrated distribution, and huge development potential. Due to the extremely low permeability of low-permeability oil and gas reservoirs, it is difficult for oil and gas to seep spontaneously to the bottom of the well, making exploration and development difficult, and the resource recovery rate is low. Therefore, effective measures must be taken to implement permeabi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/263E21B43/267
Inventor 尹光志尚德磊谢志成许江李星邓博知边光刘超黄杰刘玉冰
Owner CHONGQING UNIV
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