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Seawater-based fracturing fluid for fracturing sea high-temperature oil-gas reservoir

A technology for oil and gas reservoirs and seawater, which is applied in the directions of chemical instruments and methods, drilling compositions, etc., can solve the problems of poor high temperature resistance, and the inability to directly mix fracturing fluid for continuous construction, and achieve good gel breaking performance, enhanced Sand-carrying performance and effect of reducing dosage

Active Publication Date: 2013-07-24
BC P INC CHINA NAT PETROLEUM CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the technical problems of poor high temperature resistance in the above-mentioned prior art, and the fracturing fluid cannot be directly mixed and operated continuously, and provides a seawater-based fracturing fluid for marine high-temperature oil and gas reservoir fracturing. The fracturing fluid and thickener dissolve quickly, and can be directly mixed and applied continuously. It is especially suitable for fracturing construction in high-temperature offshore oil and gas reservoirs. -1 Under the condition of continuous shearing for 90min, the viscosity remains above 70mPa·s

Method used

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  • Seawater-based fracturing fluid for fracturing sea high-temperature oil-gas reservoir
  • Seawater-based fracturing fluid for fracturing sea high-temperature oil-gas reservoir

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Embodiment approach

[0037] As a preferred embodiment of the present invention, the present invention includes:

[0038] Base fluid: based on the mass of the prepared seawater-based fracturing fluid solution, of which: thickener accounts for 0.3%, pH regulator accounts for 0.1%, drainage aid accounts for 0.1%, and the balance is seawater;

[0039] Cross-linking agent: based on the mass fraction of the cross-linking agent relative to the base liquid, the cross-linking agent accounts for 0.4;

[0040] The thickener refers to: guar gum, carboxymethyl hydroxypropyl guar gum, hydroxypropyl guar gum, coumarin or kale gum.

[0041] According to the above formula, using the conventional mixing method using seawater as a solvent in this field, add the thickener to the seawater, stir for 5 minutes, then add the pH regulator, drainage aid, and then add the cross-linking agent to form a fracturing fluid .

Embodiment 2

[0043] As another preferred embodiment of the present invention, the present invention includes:

[0044] Base fluid: based on the mass of the prepared seawater-based fracturing fluid solution, of which: thickener accounts for 0.8%, pH regulator accounts for 0.3%, drainage aid accounts for 0.5%, and the balance is seawater;

[0045] Cross-linking agent: based on the mass fraction of the cross-linking agent relative to the base liquid, the cross-linking agent accounts for 0.6%;

[0046] All the other are with embodiment 1.

Embodiment 3

[0048] As the best implementation mode of the present invention, the present invention includes:

[0049] Base fluid: based on the mass of the prepared seawater-based fracturing fluid solution, including: 0.5% thickener, 1% oxygen scavenger, 0.4% temperature-resistant enhancer, 0.2% pH regulator, 0.2% bactericide, 0.3% clay stabilizer, 0.3% drainage aid, 0.3% foaming agent (or demulsifier), and the rest of seawater;

[0050] The thickener refers to: guar gum, carboxymethyl hydroxypropyl guar gum, hydroxypropyl guar gum, coumarin or kale gum.

[0051] Cross-linking agent: based on the mass fraction of the cross-linking agent relative to the base liquid, the cross-linking agent accounts for 0.4-0.6%;

[0052] Gel breaker: Based on the mass fraction of the gel breaker relative to the base fluid, the gel breaker accounts for 0.04-0.06%.

[0053] The temperature-resistant enhancer is hydrazine, thiourea, sulfite, etc., which can improve the flexibility of the molecular chain of t...

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Abstract

The invention discloses a seawater-based fracturing fluid for fracturing a sea high-temperature oil-gas reservoir and relates to the technical field of cross-linked gel fracturing fluid. The seawater-based fracturing fluid comprises a base solution, a cross-linking agent and a thickening agent, wherein the base solution comprises the components (in percentage by weight) in terms of the weight of the prepared seawater-based fracturing fluid total solution as follows: 0.3%-0.8% of thickening agent, 0.1%-0.3% of pH regulating agent, 0.1%-0.5% of discharge aiding agent and the balance being seawater; relative to the mass fraction of the base solution, the cross-linking agent is 0.4%-0.6%; and the thickening agent refers to guar gum, carboxy-methyl hydroxypropyl guar gum, hydroxypropyl guar gum, fenugreek gum or sesbania gum. The seawater-based fracturing fluid is adopted, so that the dissolving speed of the thickening agent is quick, and therefore, direct mixing and continuous constructing can be realized, and therefore, the seawater-based fracturing fluid is in particular suitable for the fracturing construction of the sea high-temperature oil-gas reservoir. Meanwhile, the fracturing fluid can be continuously sheared for 90 minutes under the conditions of 150 DEG C and 170s<-1>, so that the viscosity is kept to be 70mPa.s or more.

Description

[0001] technical field [0002] The invention relates to the technical field of cross-linked jelly fracturing fluid, in particular to a cross-linked jelly fracturing fluid used in marine high-temperature oil and gas reservoirs. Background technique [0003] In recent years, as the proportion of low-permeability reservoirs in new exploration blocks of domestic offshore oil and gas fields has gradually increased, it has become inevitable to introduce production stimulation measures such as hydraulic fracturing in oilfield development. At present, the liquid system used in offshore fracturing is freshwater fracturing fluid system. Since the platform has very little fresh water, the fresh water is transported from land by ship, which has disadvantages such as long distance, high cost, and affecting construction progress; while offshore oil and gas fields are rich in seawater resources , using seawater to prepare fracturing fluid has a simple process and low cost, which can s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68
Inventor 汪小宇李勇郭少儒王所良张晓丹宋振云薛大伟李志航简家斌黄超胡忠太王玉功王坤陈迎花蒋文学杨发柴巧玲邹鸿江
Owner BC P INC CHINA NAT PETROLEUM CORP
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