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Method for adding hydraulic fractured well gel breaker

A hydraulic fracturing and gel breaking agent technology, which is applied in earthwork drilling, wellbore/well components, and mining fluids, etc. It can solve the problems of excessive gel breaking agent, polluted formation, incomplete gel breaking, etc., and achieve the gel breaking dose Multiple, good fracturing effect, complete gel breaking effect

Inactive Publication Date: 2007-06-27
DAQING OILFIELD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After the formation is opened, the temperature field in the fracture goes from near to far, from low to high, and finally the same as the formation temperature. At the same time, after the fracturing fluid completes the sand-carrying task, it needs to quickly break the gel, so the existing technology evenly adds the fracture Glue, which will inevitably lead to excessive gel breaker at the beginning, so that the fracturing fluid will break the gel in advance and cause fracturing sand plugging; the amount of gel breaker in the later stage will be less, resulting in incomplete gel breaking, polluting the formation, and affecting the fracturing effect

Method used

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  • Method for adding hydraulic fractured well gel breaker

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Effect test

Embodiment 1

[0014] Example 1. In each stage of fracturing pre-fluid, sand-carrying fluid, and displacement fluid, calculate the corresponding gel breaker addition amount according to the concentration and fracturing fluid consumption in different time periods, and draw the gel breaker concentration in an excel table The change curve over time, as shown in Figure 1, is obtained by adding an exponential function trend line to the formula y=0.0019e 0.349x .

[0015] According to the formula y=0.0019e 0.349x . Calculate the concentration and quantity of gel breaker in Da 84-92 wells and Da 80-88 wells.

[0016] Additional gel breaker for wells 84-92 Table 1

[0017] stage

X accumulation time (min)

m dosage (kg)

y concentration (%)

preflux

15

0.1

0.003

3

0.1

0.005

4

0.8

0.008

Carrier fluid

5

0.3

0.011

7

1.2

...

Embodiment 2

[0020] Example 2. Taking Well Longnan 16-25 as an example, the concentration of gel breaker in the pre-fluid stage is 0.002-0.01%, and the total amount added is 1.26kg; the concentration in the sand-carrying liquid stage is 0.018-0.1%, and the amount added is 16.53kg; The stage concentration is 0.2%, and the addition amount is 8.1kg.

[0021] table 3

[0022] Longnan 16-25 Well Gel Breaker Additional Program Table

[0023] stage

x time (min)

m dosage (kg)

y concentration (%)

preflux

0

0

0.002

1.75

0.16

0.004

3.5

0.26

0.006

5.25

0.37

0.008

7

0.47

0.01

Carrier fluid

8.45

0.6

0.018

9.9

0.92

0.025

11.35

1.25

0.033

12.8

1.58

0.04

14.73

2.9

...

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Abstract

A method for additionally adding the degelating agent in hydraulic fracturing well in order to decrease the damage of hydraulic fracturing liquid to oil stratum and increasing the hydraulic fracturing effect features that the concenhtration of degelating agent is different for different phases. An equation for calculating the concentration of degelating agent is also disclosed.

Description

Technical field: [0001] The invention relates to a method for fracturing after drilling downhole rocks in the field of oil production, and belongs to a method for adding a gel breaker to hydraulic fracturing wells. Background technique: [0002] After hydraulic fracturing in low-permeability oilfields, the viscosity of the fracturing fluid needs to be reduced as soon as possible to facilitate flowback and reduce damage to the reservoir. Therefore, gel breaking performance is the key to affecting the conductivity of fracturing propped fractures. Selection and use are important links in the optimization of fracturing fluid additives and the basis for improving fracturing effects. After the formation is opened, the temperature field in the fracture goes from near to far, from low to high, and finally the same as the formation temperature. At the same time, after the fracturing fluid completes the sand-carrying task, it needs to quickly break the gel, so the existing technology ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26E21B43/22
Inventor 王岩楼张传绪柴立新尹喜永于永波高艳波
Owner DAQING OILFIELD CO LTD
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