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Old well re-transformation volume fracturing technology

A technology of repeated transformation and volume fracturing, which is applied in the field of oil fracturing, can solve the problems affecting the normal development of oil and gas fields, the reduction of fracture conductivity, and the failure to reach industrial oil and gas flow, etc. , high success rate effect

Active Publication Date: 2016-01-27
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, affected by various factors such as geology and engineering, some wells have low production after initial fracturing, and even fail to reach industrial oil and gas flow. For the normal development of oil and gas fields, for this type of well, in order to restore production capacity and obtain economical production benefits, refracturing must be carried out

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A volume fracturing process for repeated reconstruction of old wells, characterized in that it mainly includes the following steps:

[0032] Step 1: Carry out initial fracturing analysis, pre-fracture evaluation and well selection decision for wells to be re-fractured with excavation potential, and determine wells to be re-fractured with excavation potential;

[0033] Step 2: Screening fracturing fiber and particle temporary plugging agent: Screen out the fracturing fiber and temporary plugging agent for repeated transformation according to reservoir temperature, pressure, water production rate, salinity, and fracturing fluid type;

[0034] Step 3: Evaluate the dynamic and static performance of the fracturing fiber and particle temporary plugging agent screened out in step 2, and determine the final required fracturing fiber and particle temporary plugging agent;

[0035] Step 4: Determine the construction parameters;

[0036] Step five: Fracturing construction:

[00...

Embodiment 2

[0044] A volume fracturing process for repeated reconstruction of old wells, which mainly includes the following steps:

[0045] Step 1: Carry out initial fracturing analysis, pre-fracture evaluation and well selection decision for wells to be re-fractured with excavation potential, and determine wells to be re-fractured with excavation potential;

[0046]Fracturing analysis: it is to analyze the reasons for the low production and low efficiency of the initial fracturing of the gas well. If the analysis results show that the low production is due to geological reasons, there is no need to repeat the reconstruction; if the analysis results show that it is due to engineering reasons, the next step of evaluation and analysis will be carried out;

[0047] Pre-fracture evaluation: perform pre-fracture evaluation on the formation pressure of the gas well and the remaining recoverable reserves of a single well, and compare the evaluation results of the formation pressure and the remai...

Embodiment 3

[0062] (1) Primary fracturing failure analysis, pre-fracturing evaluation and technical research on well selection and layer selection, to determine potential wells to be re-fractured;

[0063] (2) Optimal fracturing fluid and proppant, including slick water system, gel system, and ceramsite;

[0064] (3) According to reservoir temperature, pressure, water production rate and salinity, fracturing fluid type and other conditions, screen out degradable fracturing fibers and temporary plugging agents suitable for repeated reservoir reconstruction, and carry out degradable fiber and temporary plugging The dynamic and static performance evaluation of the agent mainly includes the dispersibility, compatibility, sand suspension, degradability, and core damage of the fiber and the temporary plugging agent, and the combination ratio, addition method, and injection volume of the two are optimized through dynamic temporary plugging experiments , Adding ratio, adding timing and other proc...

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PUM

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Abstract

The invention relates to an old well re-transformation volume fracturing technology, which is characterized by mainly comprising the steps of carrying out primary fracturing analysis, pre-fracturing evaluation and well selection decision making on to-be-refractured wells with excavation potential, and determining a to-be-refractured well with excavation potential; screening fracturing fibers and particle temporary plugging agents; screening out the fracturing fibers and the temporary plugging agents storing re-transformation according to the temperature, the pressure, the water production rate, the mineralization degree and the fracturing fluid type of a reservoir stratum; carrying out dynamic and static performance evaluation on the screened fracturing fibers and the particle temporary plugging agents, and determining the fracturing fibers and the particle temporary plugging agents which are finally required; determining construction parameters; carrying out fracturing construction; completing transformation for reservoir stratum construction; and acquiring great reservoir stratum transformation volume, and enabling a near wellbore area major fracture to keep high flow conductivity. According to the invention, great reservoir stratum transformation volume can be acquired, and the near wellbore area major fracture is enabled to keep the high flow conductivity.

Description

technical field [0001] The invention relates to the field of petroleum fracturing, in particular to a volume fracturing process for repeated transformation of old wells. Background technique [0002] Low-permeability oil and gas reservoirs account for a relatively large proportion of my country's oil and gas resources, but this type of oil and gas reservoirs has the characteristics of low porosity and low permeability, low natural productivity, and poor conditions for stable production. Most wells have to undergo sand fracturing before being put into production. However, affected by various factors such as geology and engineering, some wells have low production after initial fracturing, and even fail to reach industrial oil and gas flow. In the normal development of oil and gas fields, for such wells, in order to restore production capacity and obtain economical production benefits, refracturing must be carried out. [0003] With the development of hydraulic fracturing tech...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26E21B43/267E21B33/13
Inventor 许洪星王祖文张冕池晓明杨德勇廖乐军李燕红陶长州刘欢陈飞杨燕李杉杉袁海平
Owner BC P INC CHINA NAT PETROLEUM CORP
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