Method for increasing length of tight reservoir hydrofracturing effective prop fracture

A technology for hydraulic fracturing and tight reservoirs, applied in the field of oil and gas field exploration and development, can solve the problems of low single well production and low fracture conductivity, so as to increase single well production, expand fracture support volume, and improve sand laying profile Effect

Inactive Publication Date: 2019-10-18
PETROCHINA CO LTD
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of existing hydraulic fracturing fractures, such as the length of effective support fractures, low fracture conductivity and low single well production

Method used

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  • Method for increasing length of tight reservoir hydrofracturing effective prop fracture

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Embodiment 1

[0024] In order to solve the problems of existing hydraulic fracturing fractures, such as the length of effective support fractures, low fracture conductivity, and low single well production. The present invention provides as figure 1 Shown is a method for increasing the effective length of hydraulic fracturing of tight reservoirs. The present invention can maximize the length of effective supporting fractures of hydraulic fracturing of tight reservoirs, improve the conductivity of fractures, improve the sanding profile, expand Fracture support volume, improve single well production.

[0025] A method for increasing the effective support fracture length of hydraulic fracturing in tight reservoirs, the specific steps are:

[0026] Step 1: before the hydraulic fracturing of the tight reservoir, the cable transmission firepower is used to perforate;

[0027] Step 2 Select ultra-low-density proppant during the hydraulic fracturing of tight reservoirs, and use sluggish water frac...

Embodiment 2

[0032] Based on the basis of Example 1, in this example, before the first fracturing, cable transmission firepower perforation was used, and the spiral hole arrangement method was used. The length of the perforation section was 4 meters, and the hole density was 16 holes / m.

[0033] In the second step, the volume density of the ultra-low density proppant is 0.8.

[0034] The ultra-low density proppant is sintered at high temperature by bauxite, corundum sand and additives, and the mass ratio of the bauxite, corundum sand and additives is: the proportion of bauxite is 75-80 %, the proportion of corundum sand is 10-15%, and the additive is 5-10%, wherein the additive is bentonite or manganese ore, and the ultra-low density proppant is a spherical double-layer structure with a hollow center.

[0035] The slick water fracturing fluid in the second step has a viscosity of 2-5 centipoise, a core damage rate of <15%, a drag reduction rate of ≥60%, and an interfacial tension of ≤0.25...

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Abstract

The invention provides a method for increasing the length of a tight reservoir hydrofracturing effective prop fracture. The method comprises the specific steps that 1, before tight reservoir hydrofracturing, a cable is used for transmitting firepower to perforate holes; 2, in the tight reservoir hydrofracturing process, an ultralow-density propping agent is selected, slickwater fracturing fluid isused in cooperation in the fracturing process, slug type pumping is adopted, and the combined grain size ultralow-density propping agent is carried and conveyed to the far end of the fracture; and 3,a well is shut in to wait for closing of the fracture. According to the method, a plug type pumping procedure is adopted, the combined grain size ultralow-density propping agent is carried and conveyed to the far end of the fracture. Due to the fact that the ultralow-density propping agent is in a full suspension state in the conveying process of slickwater, in combination with the plug type combined grain size injection manner, the conveying distance is long, the number of filled fractures is large, the prop fracture is long, it is avoided that due to the fact that the propping agent is sedimented too fast, the far end and the upper portion of the fracture cannot be effectively filled, and the fracture propping size and flow conductivity are reduced, and the per-well yield of a tight reservoir is increased.

Description

technical field [0001] The invention belongs to the field of exploration and development of oil and gas fields, specifically relates to hydraulic fracturing technology, and is a method for increasing the length of effective support fractures of hydraulic fracturing in tight reservoirs. Background technique [0002] Currently, the hydraulic fracturing used for tight reservoirs has the following characteristics: 1. The scale of fracturing is large. Generally, the single-layer vertical well or horizontal well single-stage liquid volume is ≥ 600 cubic meters, and the injection displacement is ≥ 6 cubic meters per minute. , the length and height of artificial fractures are large; 2. The extruded fractures are complex and irregular in shape; 3. Generally, ordinary quartz sand or ceramsite is used as proppant, and the volume density of this type of proppant is ≥ 1.5 g / cm3 , the apparent density is ≥2.4 g / cm3, and the distal and upper parts of the fracture cannot be fully and effect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/267E21B43/11C09K8/80
CPCE21B43/267E21B43/11C09K8/80
Inventor 马兵胡超山树民王蓓李晓燕刘顺黄蓬刚杜现飞罗凤杰王广涛
Owner PETROCHINA CO LTD
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