Method for evaluating performance of multistage hydraulic jetting fracturing pipe column

A fracturing string and hydraulic jetting technology, which is applied in earth-moving drilling, wellbore/well components, and production fluids, etc., can solve the problems of no hydraulic jet fracturing string performance evaluation method, large cost loss, waste of resources, etc. , to achieve the effect of significant application effect and cost reduction

Active Publication Date: 2016-06-15
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, there are few studies on the performance evaluation and analysis of hydraulic jet fracturing strings in low permeability oil and gas wells, and there is no performance evaluation metho

Method used

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  • Method for evaluating performance of multistage hydraulic jetting fracturing pipe column
  • Method for evaluating performance of multistage hydraulic jetting fracturing pipe column
  • Method for evaluating performance of multistage hydraulic jetting fracturing pipe column

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Effect test

Embodiment 1

[0035] In order to solve the problem of safety evaluation of multi-stage hydraulic jet fracturing strings and tools in horizontal wells, the present invention provides a performance evaluation method for multi-stage hydraulic jet fracturing strings, which is mainly applicable to multi-stage hydraulic jet fracturing in vertical wells and horizontal wells The safety analysis of pipe string performance can reduce costs and save resources, and has greater economic benefits and strong practicability.

[0036] A method for evaluating the performance of a multi-stage hydraulic jet fracturing string, the evaluation method comprising the following steps:

[0037] 1) Tubing string combination: Calculate the tensile stress safety factor of each tubing section of the hydraulic jet fracturing string according to the tensile strength of the tubing, the length of the tubing string, and the unit weight per meter, and calculate the tensile stress of the hydraulic jet fracturing string in the en...

Embodiment 2

[0049]Based on Example 1, in this embodiment, in step 1), safety factor of tensile stress=tensile strength of fracturing string / weight of string, weight of string=length of string×unit weight per meter.

[0050] Before the evaluation, it is necessary to determine the basic data of drilling and completion of each well required for the analysis

[0051] Combined with drilling and completion engineering data, according to each well's "Oil Testing (Gas) Geological Design" and "Oil Testing (Gas) Engineering Design" to obtain the well body structure data (including casing technical parameters), wellbore trajectory parameters (including well depth, well inclination and azimuth), logging data (oil (gas) bearing intervals, perforated intervals), formation prediction pressure and temperature and other data.

[0052] Determine the hydraulic jet fracturing string structure and construction data for each well required for analysis

[0053] Combined with well logging data, according to the...

Embodiment 3

[0076] Based on the above two embodiments, in this embodiment, the performance analysis and evaluation of the first section (4195m) of the jet fracturing string is carried out.

[0077] Table 1 is the jet fracturing pump injection schedule for the first section (4195m) of the well. Combined with the structural data of the fracturing string, the wellbore structure data, the properties of the liquid, etc., the performance of the first section (4195m) of the jet fracturing string is calculated. Analysis and evaluation:

[0078] Table 1. Jet fracturing pumping schedule for the first stage (4195m)

[0079]

[0080] (1) String combination

[0081] It can be seen from Table 2 that the tensile stress safety factor of the whole well string in air is greater than 1.24, and the tensile stress safety factor in 1.25 liquid is greater than 1.47. Therefore, from the perspective of longitudinal tensile strength, the combination of pipe strings is basically reasonable, and the strength of...

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Abstract

The invention relates to a method for evaluating performance of a multistage hydraulic jetting fracturing pipe column. A stress intensity safety factor mechanical analysis method is adopted mainly. Before jetting fracturing construction, combination, load, stress and deformation analysis on the multistage hydraulic jetting fracturing pipe column under static and dynamic working conditions is performed according to well completion production technical requirement specifications, mechanical property of the multistage hydraulic jetting fracturing pipe column under each working condition is accurately evaluated, and thus suggestions on parameters suitable for jetting fracturing pumping of each layer section are put forward, so as to achieve the purpose of evaluating pipe column safety in one time and guaranteeing construction safety. The method is suitable for evaluation on performance merits of the multistage hydraulic jetting fracturing fixed (or dragged) pipe columns of vertical wells and horizontal well, optimization of pipe column combination and oil testing fracturing construction design parameters can be guided, true and effective reference data is provided for underground pipe column performance detection, so that the pipe column stress safety factor is improved, and pipe column accidents are reduced.

Description

technical field [0001] The invention relates to a method for evaluating the performance of a multi-stage hydraulic jet fracturing string. Background technique [0002] Low-permeability oil and gas wells use multi-stage hydraulic jet fracturing strings for integrated operations of reservoir stimulation, oil testing, and well completion. The risk of pipe string damage under working conditions such as , perforating, oil testing, reservoir stimulation, etc., is prone to downhole accidents, resulting in construction stop or operation failure. [0003] After a comprehensive investigation of domestic and foreign research literature and data on the mechanics of pipe strings and packer pipe strings, it was found that many scholars at home and abroad have done a lot of work on the safety analysis of conventional energy-focused perforating and fracturing pipe strings in vertical and horizontal wells, and achieved great results. Some insights and conclusions. However, there are few st...

Claims

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Application Information

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IPC IPC(8): E21B43/26E21B43/114
CPCE21B43/114E21B43/26E21B43/00
Inventor 仝少凯张冕徐迎新杨红斌高红平崔会贺齐加德
Owner BC P INC CHINA NAT PETROLEUM CORP
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