Method for accelerating dissolution rate of soluble bridge plug

A technology of dissolution rate and soluble bridge, which is applied in earth-moving drilling, production fluids, wellbore/well components, etc., can solve the problem of difficult formation temperature intervention, and achieves increased wellbore treatment efficiency, improved production time, reduced Effects of complexity

Inactive Publication Date: 2020-01-07
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Firstly, it is very difficult to artificially intervene in the formation temperature; secondly, to increase the well production time rate, there is a strict limit on the soaking time, which should not be too long

Method used

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  • Method for accelerating dissolution rate of soluble bridge plug
  • Method for accelerating dissolution rate of soluble bridge plug

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] refer to figure 2 A method for accelerating the dissolution rate of a soluble bridge plug comprises the metal soluble ball described in any one of embodiments 1-3, and the method for accelerating the dissolution rate of a soluble bridge plug comprises the following steps:

[0034] Step 1: During the multi-stage fracturing operation of the horizontal well, the 5th stage of the lower perforation is not blown out after the fracturing, and the cable is connected to the perforating gun, the soluble bridge plug delivery tool and the soluble bridge plug for pumping, ignition, and delivery. Simultaneously carry out 4 perforations in the upper section. After the dissolvable bridge plug and the continuous perforation operation are successfully completed, the metal soluble ball 7 is placed on the soluble bridge plug 5 in the wellbore 6 to perform fracturing operations;

[0035] Step 2: On the basis of Step 1, pull out the cable and dissolvable bridge plug delivery tools, and carr...

Embodiment 2

[0047] refer to figure 1 , is a schematic structural diagram of Example 2 of the present invention, a metal soluble ball, the metal soluble ball 7 includes a soluble metal 1 and a filler 2, the filler 2 is a filler sphere, and the filler sphere wraps the soluble metal 1 Form a solid sphere with two layers.

[0048] In actual use: the metal soluble ball has a double-layer structure, including soluble metal 1 and filler 2, the filler 2 is a filler sphere, and the filler sphere is wrapped with soluble metal 1 to form a double-layer solid sphere, and the soluble ball dissolves Finally, the filler will speed up the dissolution of the soluble bridge plug 3, and greatly accelerate the dissolution rate of the soluble bridge plug 3, thereby reducing the soaking time and increasing the well production rate.

Embodiment 3

[0050] Compared with Embodiment 1, the difference of this embodiment is that: the radius of the filler 2 sphere is smaller than the radius of the metal soluble sphere 7 .

[0051] In actual use: the radius of the filler 2 sphere is smaller than the radius of the metal soluble ball 7, which ensures the construction time in the early stage of the construction process. When it is necessary to accelerate the dissolution of the soluble bridge plug 3, the filler 2 releases the dissolution factor to accelerate the dissolution. Dissolving, thereby improving the dissolution rate of the soluble bridge plug 3.

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Abstract

The invention relates to the field of oil exploitation, and specifically relates to a method for accelerating dissolution rate of a soluble bridge plug. The method is characterized in that a metal soluble ball is of a double-layer structure and comprises a soluble metal and a filler which is a filler ball; the outer part of the filler ball is wrapped with the soluble metal to form a double-layer solid ball; after the soluble ball is dissolved, the dissolving of the soluble bridge plug is accelerated through the filler, and the dissolving rate of the soluble bridge plug can be extremely increased, thus the soaking time is decreased, the difficulty in treatment of a shaft after pressing is reduced, the treatment cost of the shaft after pressing is decreased, and the production time rate of awell is increased.

Description

[0001] Technical field [0002] The invention relates to the field of oil exploitation, in particular to a method for accelerating the dissolution rate of a soluble bridge plug. Background technique [0003] my country is rich in unconventional oil and gas resources, mainly distributed in the Ordos, Sichuan, Songliao, Bohai Bay, Junggar and other basins. The results of exploration and evaluation studies show that the total resources of tight oil alone reach 11-13.5 billion tons. With the continuous progress of exploration and development technology, especially the breakthrough of horizontal well volume fracturing technology, the development of unconventional oil and gas resources has carried out pilot tests in Changqing Oilfield, Daqing Oilfield and Turpan-Hami Oilfield and achieved a series of major breakthroughs. The volume fracturing technology of horizontal well soluble bridge plug has become the main technology of unconventional reservoir stimulation. [0004] Parameters...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B29/00E21B43/26
CPCE21B29/00E21B43/26
Inventor 陈强慕立俊赵振峰李宪文张矿生唐梅荣杜现飞白晓虎马兵李晓燕
Owner PETROCHINA CO LTD
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