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Fracturing pipe column and a fracturing method

A fracturing string and fracturing technology, applied in the field of oil production and completion of oil and gas wells, can solve problems such as construction interruption, increased workload, and affecting fracturing effects

Active Publication Date: 2021-10-22
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a fracturing string and a fracturing method to solve the problem that in the prior art, the fracturing string dragged by the tubing needs to discharge the liquid in the well after fracturing one layer, causing construction interruption , increasing the workload and technical problems that affect the fracturing effect

Method used

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  • Fracturing pipe column and a fracturing method
  • Fracturing pipe column and a fracturing method
  • Fracturing pipe column and a fracturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] The invention provides a fracturing string, such as figure 1 As shown, the fracturing string includes a tubing 91, a hydraulic anchor 92, a first packer 931, a differential pressure sleeve 94, and a second packer 932 connected in sequence from top to bottom; Figure 4 with Image 6 As shown, the differential pressure sliding sleeve 94 includes: a sandblasting cylinder 10, a connecting cylinder 20 and a sliding sleeve 30, the side wall of the sandblasting cylinder 10 is provided with a sandblasting port 11; the connecting cylinder 20 is fixedly connected to the upper end of the sandblasting cylinder 10, and connected The lower end of the cylinder 20 is provided with a cylinder connecting portion 203, and the cylinder connecting portion 203 is arranged in the sandblasting cylinder 10; 10, the outer wall of the sliding sleeve 30 is sealed with the inner wall of the sandblasting cylinder 10 and the inner wall of the connecting cylinder 20 respectively. Below, a liquid sto...

Embodiment 2

[0072] The present invention provides a differential pressure sliding sleeve 94, such as Figure 4 with Image 6 as shown, Figure 4 The upper end 71 of the middle differential pressure sliding sleeve is located at Figure 4 The upper end of the differential pressure sliding sleeve 94 includes: a sandblasting cylinder 10, a connecting cylinder 20 and a sliding sleeve 30, and the side wall of the sandblasting cylinder 10 is provided with a sandblasting port 11; The lower end of the cylinder 20 is provided with a cylinder connecting portion 203, and the cylinder connecting portion 203 is arranged in the sandblasting cylinder 10; 10, the outer wall of the sliding sleeve 30 is sealed with the inner wall of the sandblasting cylinder 10 and the inner wall of the connecting cylinder 20 respectively. Below, a liquid storage chamber 40 is provided between the outer shoulder 301 and the cylinder connection part 203, and the side wall of the blasting cylinder 10 is provided with a liq...

Embodiment 3

[0092] The present invention provides a fracturing method, using the above-mentioned fracturing string, such as Figure 11 As shown, the fracturing method includes:

[0093] Step S10, lowering the fracturing string to the target layer to be fractured;

[0094] Step S20, the hydraulic anchor 92 is anchored, and the first packer 931 and the second packer 932 are pressed;

[0095] Step S30, continue pressing to open the differential pressure sliding sleeve 94;

[0096] Step S40, implementing fracturing construction for the target layer to be fractured;

[0097] Step S50, pitching or bidding closes the differential pressure sliding sleeve 94;

[0098] Step S60, releasing the pressure in the pipe or lifting the pipe string to realize the unsealing of the first packer 931 and the second packer 932; the hydraulic anchor 92 is unanchored;

[0099] Step S70, lifting the pipe string to the next target layer to be fractured;

[0100] Step S80, repeating steps S20, S30, S40, S50 and ...

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Abstract

The invention provides a fracturing pipe column and a fracturing method. The fracturing pipe column comprises an oil pipe, a hydraulic anchor, a first packer, a differential pressure sliding sleeve and a second packer which are sequentially connected from top to bottom. The differential pressure sliding sleeve comprises a sand blasting cylinder, a connecting cylinder and a sliding sleeve. The connecting cylinder is fixedly connected to the upper end of the sand blasting cylinder; the sliding sleeve is arranged in the sand blasting cylinder, the outer wall of the sliding sleeve is provided with an outer circular bead, the outer circular bead is located below a cylinder body connecting part, a liquid storage cavity is formed between the outer circular bead and the cylinder body connecting part, and the side wall of the sand blasting cylinder is provided with a liquid outlet communicated with the liquid storage cavity; a bearing conical surface for bearing a ball is arranged on the inner wall of the sliding sleeve, and the bearing conical surface can be expanded outwards under the action of set thrust applied by the ball; a first clamping groove and a second clamping groove which are sequentially distributed up and down are formed in the connecting cylinder, and the sliding sleeve is provided with a spring claw. By means of the fracturing pipe column and the fracturing method, the technical problems that in the prior art, the fracturing pipe column dragged through the oil pipe is adopted, liquid in a well needs to be discharged after one layer is fractured, construction is interrupted, the workload is increased, and the fracturing effect is affected are solved.

Description

technical field [0001] The invention relates to the technical field of oil production and completion of oil and gas wells, in particular to a fracturing string and a fracturing method. Background technique [0002] Reservoir stimulation is usually required to tap low-permeability reservoirs such as shale gas and tight oil and gas, as well as the remaining oil and gas potential of low-yield old oilfields. The multi-stage fracturing technology is the fundamental guarantee for the successful implementation of reservoir stimulation; among them, the straddle pack multi-stage fracturing technology is a widely used and highly reliable technology. [0003] In some straddle-packed multi-stage fracturing strings, a fracturing tool combination with a pressure-guiding sandblasting device installed in series between two differential pressure packers is used to isolate other layers and implement fracturing operations on the target layer. This process utilizes the throttling pressure diff...

Claims

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Application Information

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IPC IPC(8): E21B43/26E21B34/14E21B34/08E21B33/122
CPCE21B43/26E21B34/14E21B34/08E21B33/122
Inventor 王新忠魏然张国文李益良魏松波陈琳童征
Owner PETROCHINA CO LTD
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