Composite Perforation Device with Propping Agent for Fracture Stability
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Solution Overview
Problem
Composite perforation methods used in oil and gas wells initially increase productivity but face a decline due to the closure of fractures over time, shortening the high-productivity oil extraction cycle.
Innovation Solution
A composite perforation method and device that delivers a propping agent into fractures during the fracturing process, using a propping agent unit with propellants to stabilize the fractures and prolong oil extraction by carrying the propping agent into the perforation tunnel via the high-speed jet flow and thrust generated by detonation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If composite perforation is performed without propping agent, then initial productivity increase is achieved, but fracture closure occurs over time reducing productivity
Solution Approach 1:
The propping agent is delivered into the fractures during the perforation process itself, before the fractures have a chance to close. The propping agent unit is positioned at the open end of the perforating charges and the propping agent is carried into the perforation tunnel and fractures by the negative pressure from jet flow and thrust from propellant, ensuring fractures are propped before closure can occur
Solution Approach 2:
The propping agent acts as an intermediary substance that is introduced into the fractures to prevent direct contact between the fracture walls. This intermediary material physically props open the fractures, maintaining the flow pathways created by the perforation and preventing the natural closure that would otherwise occur
2Reliability
If propping agent unit with propellant is added to perforator, then fracture propping capability is improved, but device complexity increases
Solution Approach 1:
The propping agent unit is merged with the existing perforator structure. The propping agent box is positioned at the open end of the perforating charges and is integrated into the perforator assembly. The propellant is combined with the propping agent in the same unit, allowing both functions to be performed by a single integrated component rather than separate systems
Solution Approach 2:
The propping agent unit serves multiple functions: it contains the propping agent, provides the propellant to deliver the propping agent into the fractures, and is integrated with the perforating charge structure. This multi-functional design reduces the need for separate systems and minimizes overall device complexity while achieving reliable fracture propping
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Effectively props fractures to maintain sustained oil production and extend the oil extraction cycle by ensuring the propping agent is carried into the fractures, preventing closure and maintaining high productivity.
Implementation Method 1
A perforation tunnel is formed between the wellbore and stratum due to the high-speed jet flow generated by the detonation of the perforating charges
Implementation Method 2
the negative pressure arising from the jet flow carries the propping agent into the perforation tunnel
Implementation Method 3
the propping agents are carried into the perforation tunnel by the negative pressure arising from the jet flow and a thrust generated by the propellant
Implementation Method 4
The high temperature and high pressure gases enter the perforation tunnel through the perforation hole and pressure releasing holes on the gun body to perform effective gas fracturing to the stratum
Data Source
AI summary
The present invention provides composite perforation methods and device with propping agent capable of effectively propping the fractures in the oil layer, thereby reducing the closure of fractures and prolonging the oil extraction cycle. The device comprises one or more connected perforators wherein each of said perforator comprises one or more perforating charges and a propping agent unit 7 at the open end of each of said perforating charge, a pressure release hole 9 located directly behind the jet flow of said perforating charge, and a shatterable sealing sheet 8 mounted on said pressure releasing hole 9, wherein said propping agent unit 7 comprises a propping agent box 70, a center through-hole 71 located at the center of said propping agent box 70, and propping agent 72 in said propping agent box 70.