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Seawater base quick-dissolving type temperature-resistance fracturing fluid system

A fracturing fluid and system technology, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the limitation of offshore oilfield fracturing reconstruction scale, limited fresh water and fresh water storage capacity, and restricts the efficient development of offshore low-permeability oil and gas and other issues to achieve the effect of reducing damage and developing efficiently

Inactive Publication Date: 2015-10-28
CNOOC ENERGY TECH & SERVICES +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For offshore operations, the ability to obtain fresh water and store fresh water is limited; affected by factors such as water resources and sites, the scale of fracturing reconstruction in offshore oilfields is limited, and the efficient development of offshore low-permeability oil and gas is restricted.

Method used

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  • Seawater base quick-dissolving type temperature-resistance fracturing fluid system
  • Seawater base quick-dissolving type temperature-resistance fracturing fluid system
  • Seawater base quick-dissolving type temperature-resistance fracturing fluid system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] In this example, the 95°C seawater-based instant heat-resistant fracturing fluid formula is: 0.9% by weight of seawater-based instant thickening agent, 0.1% by weight of retarder, and 0.8% by weight of salt-resistant composite crosslinking agent, The weight percentage of the demulsification aid drainage agent is 0.3%, and the weight percentage of the gel breaker is 0.2%; the rest is seawater.

[0035] As shown in Table 1, the minerals in seawater include trace or trace amounts of Br, I, Cr, Fe, Al, As in addition to the elements such as Na, K, Cl, B, Ca, and Mg. Ionic elements with high valence and variable valence. The presence of these ionic elements affects the molecular stretching of the polymer thickener during the hydration and dissolution process. The higher the content of calcium and magnesium ions, the greater the effect, and the molecular chain of the thickener is difficult to curl. Stretching, causing the thickener to dissolve incompletely or even completely ins...

Embodiment 2

[0090] The fracturing fluid in Example 2 is a 140°C seawater-based instant heat-resistant fracturing fluid system; the specific formula is: seawater-based instant thickener 1.0% by weight, retarder 0.2% by weight, and salt-resistant composite crosslinking The weight percentage of the agent is 0.8%, the weight percentage of the demulsification aid is 0.3%, and the weight percentage of the gel breaker is 0.2%; the rest is seawater.

[0091] The performance of the fracturing fluid in this example is shown in Table 8.

[0092] Table 8 Index comparison data between industry standards and 140℃ seawater-based instant temperature-resistant fracturing fluid system

[0093]

[0094] The experimental data in Table 7 and Table 8 prove the good performance of the 95℃ and 140℃ seawater-based instant temperature-resistant fracturing fluid system, which meets the various conditions used in on-site construction. The invention enables the use of seawater resources to replace fresh water to configure ...

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Abstract

The invention discloses a thickening agent. The main structure is compounded polymer with sulfonate as the main structure and vinyl pyrrolidone, acrylonitrile and cationic monomer as the subprimary monomer. The weight ratio of the sulfonate, the vinyl pyrrolidone, the acrylonitrile and the cationic monomer is 9:2:4:1. The invention further discloses a seawater base quick-dissolving type temperature-resistance fracturing fluid system prepared by the thickening agent. The prepared fracturing fluid can use the seawater directly for liquid match and can instantly dissolve within 5 min, the residue content is smaller than 100 mg / L which is much lower than a industrial standard of being no greater than 600mg / L, and the damage to the bottom layer is reduced greatly.

Description

Technical field [0001] The invention relates to a seawater-based instant fracturing fluid system, in particular to a seawater-based instant fracturing fluid system suitable for higher seawater temperature. Background technique [0002] For low-permeability reservoirs, fracturing technology is the main production stimulation measure. The fracturing operation can improve the seepage state of the oil and gas layer and play a role in increasing production and injection. At present, the application of fracturing technology is the most effective way to increase the production of a single well in low permeability reservoirs. [0003] At present, my country has abundant offshore oil and gas reserves; however, the low-permeability oil reserves are relatively low in pneumatic use. With the development of offshore oil and gas fields, the development of deep-sea and low-permeability oil fields will be the main direction for Chinese companies to develop offshore oil fields in the future. In ...

Claims

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Application Information

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IPC IPC(8): C08F220/58C08F226/02C08F220/34C08F220/48C08F226/10C09K8/68
Inventor 宋爱莉任峰德刘全刚周际永易飞刘敏黄波熊俊杰安琦田跃儒李宇刘春祥唐富刚郝春玲孙成丽修艳玲
Owner CNOOC ENERGY TECH & SERVICES