Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for sealing and unsealing soluble tools

A technology that can dissolve seals and tools, and is applied in the directions of sealing/isolation, earthwork drilling, wellbore/well components, etc. It can solve problems such as the entry of dissolved media, wellbore blockage, and impact on oil production, so as to improve effectiveness and timeliness performance, and the effect of improving applicability

Active Publication Date: 2020-06-05
PETROCHINA CO LTD
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If conventional media such as low-viscosity drag-reducing fluid are used as the pumping fluid, due to fracturing operations, a large amount of fracturing fluid will enter the reservoir, and it will take a long time for the precipitation of high-concentration chloride ions in the reservoir, which will easily cause the soluble bridge plug to be insoluble Or the dissolution effect is poor
If the dissolving medium is used as the pumping fluid, since the moving speed of the soluble ball is not synchronized with the flow speed of the dissolving medium, it is obviously faster than the dissolving medium. It cannot reach the position of the soluble bridge plug, and the fracturing operation will cause the dissolved medium to enter the reservoir, while the soluble bridge plug will not be in contact with the dissolved medium, and it is easy to cause the soluble bridge plug to be insoluble or have poor dissolution effect
After the fracturing is completed, because the medium conditions for dissolving the soluble bridge plug are not satisfied, resulting in insoluble or poor dissolving effect, slugs are formed in the well, causing the wellbore to be blocked and affecting subsequent oil production

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for sealing and unsealing soluble tools
  • Method for sealing and unsealing soluble tools

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] refer to figure 1 with figure 2 , the embodiment of the present invention proposes a method for sealing and unsealing a soluble tool, including the following steps: Step 001: Run the soluble sealing tool 5 and the perforation tool string 4 into the straight section of the oil well casing 1 with a cable , until it reaches the front end of the oblique section or horizontal section of the oil well casing 1; step 002: run the soluble packing tool 5 and the perforation tool string 4 into the oil well casing 1 along the inclined section by hydraulic pumping In the isolation position, first use the pumped conventional medium 2 to push the perforation tool string 4 to move for a certain distance, and then replace the pumped medium with the dissolved medium 3; step 003: first set the soluble isolation tool 5 in the oil well casing 1, Then lift the perforating tool string 4 to complete the perforation of the wellbore casing 1, and lift the perforating tool string 4 after comple...

Embodiment 2

[0030] On the basis of Example 1, the magnesium content in the soluble sealing tool 5 and the soluble ball 6 exceeds 50%.

[0031] Both the soluble sealing tool 5 and the soluble ball 6 are made of a magnesium alloy with a magnesium content exceeding 50%, so that the soluble sealing tool 5 and the soluble ball 6 can be completely dissolved in the dissolution medium 3 within a preset time .

Embodiment 3

[0033] refer to figure 1 , the perforating tool string 4 is a multi-cluster perforating gun, and is lowered into the oil well casing 1 together with the soluble isolation tool 5 through the cable.

[0034] The multi-cluster perforating gun can simultaneously perforate multiple parts in the oil well casing 1 under the control of the cable, and open holes on the side wall of the oil well casing 1 to make it communicate with the formation outside the oil well, which is convenient for drilling The ground is fractured.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a method for sealing and unsealing soluble tools. The method comprises the steps that S001, a soluble sealing tool and a perforating tool string are placed into a straight section of an oil well casing pipe; S002, the soluble sealing tool and the perforating tool string are pumped into a predetermined sealing position in the oil well casing pipe, a conventional medium is firstly pumped, and then a dissolving medium is pumped; S003, the soluble sealing tool is set in the oil well casing pipe first, the oil well casing pipe is perforated, and the perforating tool string istaken out after perforation is completed; S004, a soluble ball is delivered on the ground, the conventional medium is pumped to push the soluble ball to reach the position of the soluble sealing tool, and at the moment, the soluble sealing tool is in the dissolving medium; S005, a fracturing fluid and a proppant are pumped into the oil well casing pipe for fracturing construction; and S006, a newsealing position is selected in the oil well casing pipe, and the steps from 001 to 005 are repeatedly conducted. According to the method for sealing and unsealing the soluble tools, the applicability, effectiveness, and timeliness of the soluble sealing tools are improved.

Description

technical field [0001] The invention belongs to the technical field of fracturing in oil and gas fields, and in particular relates to a method for sealing and unsealing a soluble tool. Background technique [0002] At present, the staged fracturing of horizontal wells in gas fields in tight oil and gas reservoirs is mainly based on hydraulic pumping bridge plug fracturing technology, and the bridge plug mainly adopts ball-type bridge plugs. With the development of soluble metal material technology and the improvement of soluble material properties, soluble metal materials have been widely used in bridge plug tools, forming a fully soluble bridge plug fracturing tool with magnesium and aluminum as the main component. It has the characteristics of reliable isolation, light casing fracturing, unlimited stages of fracturing stages, and self-dissolution under certain temperature and dissolution medium (concentration of about 1.5% potassium chloride solution). An effective means ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/12
CPCE21B33/12
Inventor 胡相君桂捷任国富薛晓伟邵媛张安康郭思文李旭梅张文星冯长青
Owner PETROCHINA CO LTD