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Ultra-high temperature carbonate reservoir yield increase transformation method

A carbonate reservoir, ultra-high temperature technology, used in chemical instruments and methods, earthwork drilling, wellbore/well components, etc. Long effective action distance and other issues, to achieve broad market application prospects, improve the effective action distance, and the effect of long effective action distance

Pending Publication Date: 2022-07-12
中国石油天然气股份有限公司西南油气田分公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] (3) The system stability of the acid liquid system will become poor at high temperature, that is, the gel-type acid liquid system will break the gel, etc.
However, the biggest drawback in the acid treatment process of this type of system is that it is difficult to obtain fractures with high conductivity.
Generally, it is difficult to obtain a long effective action distance for an acid solution with high conductivity, and it is difficult to obtain a high conductivity fracture for an acid solution with a low reaction rate

Method used

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  • Ultra-high temperature carbonate reservoir yield increase transformation method

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Effect test

Embodiment 1

[0040]Conductivity experiments were used to compare and test the effect of film addition agents on fracture conductivity, and the experimental temperature was 180 °C. The experimental slate is marble with a calcium carbonate content greater than 99%. Displacement sequence of experiment one: acid solution 1-base fluid; displacement sequence of experiment two: dispersed film-forming agent-acid solution 1-base fluid; displacement sequence of experiment three: acid solution 2-base fluid; displacement sequence of experiment four: Disperse film former - acid solution 2 - base solution. The composition of acid solution 1 is: 70 parts of fracturing fluid + 28 parts of sodium alginate-coated solid hydrochloric acid + 2 parts of imidazoline oleate; the composition of acid solution 2 is: 60 parts of fracturing fluid + 38 parts of sodium alginate-coated sulfamic acid + 2 parts of imidazoline oleate; dispersing film-forming agent: 20 parts of acrylic resin emulsion + 2 parts of non-ionic ...

Embodiment 2

[0045] Taking the engineering reconstruction of Well A in the S gas field as the implementation object, the acid fracturing measures were carried out using the ultra-high temperature carbonate reservoir stimulation stimulation method. Well A is a carbonate gas well with dolomite lithology and a reservoir temperature of 167°C. According to the characteristics of the reservoir, the transformation method is determined as conventional acid fracturing.

[0046] Step 1: Use tubing to inject into the annulus to discharge the well flushing fluid, the well flushing fluid is 5% acetic acid + 1% oleic acid imidazoline;

[0047] Step 2: The formation is opened and the fracture is extended under a pressure higher than the formation fracture pressure, and the fracturing fluid is a high temperature resistant fracturing fluid;

[0048] Step 3: Inject the dispersion film-forming agent A into the formation. The composition of A is 30 parts of acrylic resin emulsion + 1 part of non-ionic paraff...

Embodiment 3

[0056] Taking the engineering stimulation of Well B in S gas field as the implementation object, acid fracturing measures were carried out using the stimulation stimulation method of ultra-high temperature carbonate reservoirs. Well B is a carbonate gas well with dolomite lithology and a reservoir temperature of 169°C. According to the characteristics of the reservoir, the transformation method is determined as conventional acid fracturing.

[0057] Step 1: Use tubing to inject into the annulus to discharge the well flushing fluid, the well flushing fluid is 5% acetic acid + 1% oleic acid imidazoline;

[0058] Step 2: open the formation and extend the fracture under the formation fracture pressure, and the fracturing fluid is resistant to high temperature fracturing fluid;

[0059] Step 3: Inject the dispersed film-forming agent A into the formation * agent, A * The agent composition is 20 parts of acrylic resin emulsion + 10 parts of polyurethane film-forming agent + 1 par...

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Abstract

The invention relates to an ultra-high temperature carbonate reservoir yield increasing transformation method which sequentially comprises the following steps: (1) circularly cleaning a shaft and a pipeline in a manner of oil pipe injection and annulus discharge or annulus injection and oil pipe discharge; (2) fracturing fluid is injected into the stratum to enable the stratum to generate cracks; (3) injecting a dispersion film-forming agent into the stratum; (4) slow-speed acid liquid is injected into the stratum, and the effective acting distance of the acid liquid in the crack is increased; (5) a diverting agent is injected into the stratum, the acid fracturing effect is improved, and fracture net acid fracturing is achieved; (6) repeating the step (3); (7) injecting closing acid into the stratum to improve the fracture conductivity of the near well; (8) displacing fluid is injected into the stratum; and (9) closing the well for 1-5 hours, and opening the well for flowback. The dispersing type film-forming agent is used for forming non-uniform adsorption on the wall surface of the crack, so that non-uniform etching is realized during acid reaction, the effective distance of acid action is increased and the corrosion of acid to an oil casing is reduced by using the wrapping acid, and the method has important significance on yield increase transformation of high-temperature and ultra-high-temperature carbonate reservoirs.

Description

technical field [0001] The invention belongs to the technical field of oil and gas field stimulation, and in particular relates to a method for stimulation and reformation of ultra-high temperature carbonate reservoirs. Background technique [0002] Acidizing or acid fracturing is the main method of increasing production in carbonate reservoirs. The method is to inject acid into the formation to dissolve the mineral composition of the reservoir rock and the formation of blockage of the reservoir during drilling, completion, workover and production operations. Substances that improve and enhance the permeability of reservoirs, thereby increasing the productivity of oil and gas wells. The mechanism of action is that HCl reacts with the rock wall after entering the reservoir, and the main mineral involved in the reaction is calcite (CaCO). 3 ) and dolomite (CaMg(CO 3 ) 2 ), the reaction equation is: [0003] CaCO 3 +2HCl=CaCl 2 +CO 2 +H 2 O [0004] CaMg(CO 3 ) 2 +4H...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B21/00E21B43/26E21B43/27E21B33/13E21B41/02C09K8/74
CPCE21B21/00E21B43/26E21B43/27E21B43/261E21B41/02C09K8/74
Inventor 杨建刘平礼熊钢杜娟陈伟华陈鹏飞刘飞熊颖李年银罗志锋
Owner 中国石油天然气股份有限公司西南油气田分公司