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Carbonate reservoir self-filtrate-reducing acid fracturing method

A carbonate reservoir and self-falling technology, which is applied in chemical instruments and methods, earthwork drilling and production, and mining fluids, etc., can solve the problems of reservoir and wellbore conditions, injection equipment wear, and difficulty in effectively reducing filtration. Achieve the effect of solving the difficulty of construction injection, easy flowback, and improving the transformation effect

Active Publication Date: 2019-11-12
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The liquid thickened filtration mainly uses cross-linked polymers. The thickened acid liquid has the problems of difficult injection and many residues after gel breaking. The biggest problem of the solid phase filtration is poor injectability and serious wear on the injection equipment, making it difficult to achieve effective Filter reduction, and the above filter reduction methods all have certain restrictions on reservoir and wellbore conditions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Taking the engineering transformation of Well H in B oilfield as the implementation object, the self-decreasing filter acid fracturing technology is used for the transformation. Before the reservoir transformation, configure the working liquid required for construction, gelled acid A 1 agent, self-filtering gelled acid B 1 agent, closed acid C 1 agent, replacement solution D 1 agent.

[0035] A 1 Agent: 15% HCl + 0.3% methylated polyacrylamide + 0.8% oleic acid imidazoline + 0.2% butynyl alcohol + 0.5% ethylenediaminetetraacetic acid + 0.5% citric acid + 1% fluorocarbon surfactant + 0.5% polyoxyethylene ether, the rest is water.

[0036] Per 100g dose:

[0037] Add 42.9g of 35% HCl, 0.3g methylated polyacrylamide, 0.8g oleic acid imidazoline, 0.2g butynyl alcohol, 0.5g ethylenediaminetetraacetic acid, 0.5g citric acid, 1g fluorocarbon surfactant, 0.5g polyoxyethylene ether, 53.3g water.

[0038] B 1 Agent: 20% HCl + 5% HF + 5% ammonium sulfate + 0.3% methylated...

Embodiment 2

[0056] Taking the engineering transformation of well M in B oilfield as the implementation object, the self-decreasing filter acid fracturing technology is used for the transformation. Before reservoir transformation, configure the working liquid required for construction, VES acid A 2 agent, self-filtering VES acid B 2 agent, closed acid C 2 agent, replacement solution D 2 agent.

[0057] A 2 Agent: 5% HCl + 5% erucamide propyl hydroxy sultaine + 0.3% oleic acid imidazoline + 0.1% diethylene triamine + 0.1% methyl acetylenic alcohol + 0.2% citric acid + 0.3% L-glucose Acid + 1% fluorocarbon surfactant, the rest is water.

[0058] Per 100g dose:

[0059] Add 14.3g of 35% HCl, 5g erucamide propyl hydroxy sultaine, 0.3g imidazoline oleate, 0.1g diethylenetriamine, 0.1g methyl acetylenic alcohol, 0.2g citric acid, 0.3g L-glutamine Acid, 1g fluorocarbon surfactant, 78.7g water.

[0060] B 2 Agent: 18%HCl+5%HF+5%NH 4 F + 5% ammonium sulfate + 8% erucamide propyl hydroxy s...

Embodiment 3

[0078] Taking the engineering transformation of Well Q in B Oilfield as the implementation object, the self-decreasing filter acid fracturing technology is used for the transformation. Before the reservoir transformation, configure the working liquid required for construction, gelled acid A 3 agent, self-filtering VES acid B 3 agent, closed acid C 3 agent, replacement solution D 3 agent.

[0079] A 3 Agent: 10% HCl + 0.5% carboxymethyl hydroxyethyl cellulose + 0.6% oleic acid imidazoline + 0.2% oleic acid + 0.2% hexapressurized methyltetramine + 0.3% nitrilotriacetic acid + 0.7% L-glucose Acid + 1% fluorocarbon surfactant, the rest is water.

[0080] Per 100g dose:

[0081] Add 28.6g of 35% HCl, 0.5g carboxymethyl hydroxyethyl cellulose, 0.6g oleic acid imidazoline, 0.2g oleic acid, 0.2g hexapressurized methyltetramine, 0.3g nitrilotriacetic acid, 0.7g L- Glutamic acid, 1g fluorocarbon surfactant, 67.9g water.

[0082] B 3 Agent: 15% HCl + 3% HF + 5% ammonium sulfate ...

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PUM

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Abstract

The invention relates to a carbonate reservoir self-filtrate-reducing acid fracturing method. The carbonate reservoir self-filtrate-reducing acid fracturing method comprises the steps that (1) fracture pressure and fracture extension pressure of a transformed reservoir are calculated; (2) an A agent is injected into a stratum under the condition of being higher than stratum fracture pressure, so that fractures are generated on the stratum; (3) a B agent is injected into the stratum under the condition of being higher than the stratum fracture pressure, and the B agent extends the fractures andcommunicates with a natural fracture net; (4) an acid liquor system C agent with the high etching power is pumped into the stratum under the condition of being higher than the extension pressure andlower than the fracture pressure, and the fracture conductivity is improved; (5) a D agent of displacing liquid is injected under the condition of being lower than the stratum fracture pressure, acidliquor in a well casing is jacked into the stratum; and (6) a well is shut down, and flow-back is carried out. The A agent is gel acid or VES acid, the B agent is self-filtrate-reducing gel acid or self-filtrate-reducing VES acid, the C agent is closed acid, and the D agent is the displacing liquid. Precipitation type solid filter cakes are formed on the wall surfaces of the fractures by utilizinga self-filtrate-reducing system, temporary blocking filtrate reducing is carried out, the technology is simple, injection is facilitated, filtrate-reducing agents are easy to disperse and flow back,and the method is safe and environment-friendly.

Description

technical field [0001] The invention relates to a temporary plugging acid fracturing reduction process used in the development of oil and gas fields, in particular to a method for self-depressing acid fracturing in carbonate reservoirs. Background technique [0002] Acid fracturing is one of the main measures to increase the production of carbonate rock reservoirs. During the acid fracturing process, acid liquid often leaks along the acid-etched fractures, which affects the extension along the main fractures. The range of acid fracturing stimulation is limited, resulting in acid fracturing. The construction effect is not good or even fails. Therefore, in order to improve the efficiency of acid fracturing and increase the extension length of main fractures, it is necessary to control acid fluid loss and realize deep etching of fractures. In order to solve this problem, the most commonly used measure is to introduce filter reducer during construction or increase the viscosity...

Claims

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Application Information

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IPC IPC(8): E21B43/27C09K8/74
CPCE21B43/26C09K8/74C09K8/725C09K8/68C09K2208/30C09K2208/32C09K8/76C09K8/92E21B21/08
Inventor 陈薇羽赵立强罗志锋杜娟刘平礼
Owner SOUTHWEST PETROLEUM UNIV
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