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A kind of acid-soluble plugging agent for staged fracturing of sidetracking slim hole and preparation method thereof

A staged fracturing and acid-soluble technology, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problem of not using acid-soluble plugging agents, failing to meet oilfield fracturing conditions, and failing to meet fracturing construction requirements and other problems to achieve the effect of increasing single well production and reducing water loss

Active Publication Date: 2021-09-28
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, there is currently no acid-soluble plugging agent used in the field of oilfield fracturing, and the existing acid-soluble plugging agent cannot meet the conditions of oilfield fracturing
[0006] CN107474809A (application publication date: December 15, 2017) patent has invented an acid-soluble cement temporary plugging agent, which is used in the field of oil well cementing, suitable for oil wells at 30-100°C, and has a 24h compressive strength It is 14.5-18.8MPa, less than 20MPa, which cannot meet the fracturing requirements of sidetracking wells in Changqing Oilfield (≥30MPa). Therefore, it is necessary to invent a new type of acid-soluble plugging agent to meet the fracturing requirements

Method used

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  • A kind of acid-soluble plugging agent for staged fracturing of sidetracking slim hole and preparation method thereof

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preparation example Construction

[0028] The embodiment of the present invention provides a kind of preparation method of acid-soluble plugging agent, specifically comprises the following steps:

[0029] The parts by weight are 4-8 parts of dispersant, 0-2 parts of borax, 0.1-0.2 parts of citric acid, 0.05-0.2 parts of phosphoric acid, 0.3-2 parts of fluid loss reducer, 30-50 parts of magnesium chloride and 30-50 parts of water Prepare a mixed solution, prepare mixed dry powder with 100 parts of dead burnt magnesia, 5-100 parts of ultra-fine light calcium carbonate, and 10-20 parts of silicon micropowder; add the mixed dry powder and the mixed solution to the blade stirring Stir in the vessel to obtain the acid-soluble blocking agent.

[0030]For the preparation process of acid-soluble plugging agent, please refer to the preparation method of oil well cement described in Chapter 5 of GB / T19139-2012, and determine the type of blade agitator that should be used accordingly. At the same time, the stirring speed ...

Embodiment 1

[0043] This embodiment provides an acid-soluble plugging agent for staged fracturing of a sidetracked slim hole. The temporary plugging agent includes the following components in parts by weight: 100 parts of dead-burned magnesia, 50 parts of magnesium chloride, Calcium 10 parts, silica powder 20 parts, dispersant 8 parts, borax 0.5 parts, citric acid 0.2 parts, phosphoric acid 0.2 parts, fluid loss reducer 2 parts, water 40 parts.

[0044] Among them, the main component of dead-burned magnesia is MgO≥93%, other components SiO2≤3.5%, CaO≤1.6%, the particle size of ultrafine light calcium carbonate is 1250 mesh, the particle size of silicon micropowder is 1000 mesh, and the dispersant is tripolymer Sodium phosphate, fluid loss reducer is Wenlun rubber.

[0045] The acid-soluble plugging agent provided in this example is prepared by the following method:

[0046] Sodium tripolyphosphate, borax, citric acid, phosphoric acid, magnesium chloride, Wenlun glue and water are prepared...

Embodiment 2

[0048] This embodiment provides an acid-soluble plugging agent for staged fracturing of a sidetracked slim hole. The temporary plugging agent includes the following components in parts by weight: 100 parts of dead-burned magnesia, 40 parts of magnesium chloride, superfine light carbonic acid 10 parts of calcium, 20 parts of silica powder, 4 parts of dispersant, 2 parts of borax, 0.1 part of citric acid, 0.1 part of phosphoric acid, 2 parts of fluid loss reducer, 50 parts of water.

[0049] Among them, the main component of dead-burned magnesia is MgO≥93%, other components SiO2≤3.5%, CaO≤1.6%, the particle size of ultrafine light calcium carbonate is 1250 mesh, the particle size of silicon micropowder is 1000 mesh, and the dispersant is tripolymer Sodium phosphate, fluid loss reducer is Wenlun rubber.

[0050] The acid-soluble plugging agent provided in this example is prepared by the following method:

[0051] Sodium tripolyphosphate, borax, citric acid, phosphoric acid, magn...

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Abstract

The invention belongs to the technical field of oil field fracturing, and specifically relates to a method for realizing 3 1 / 2 "Acid-soluble plugging agent for staged fracturing of tubing (inner diameter 76mm) cementing and completion sidetracking slim hole and its preparation method. The plugging agent includes the following raw materials in parts by weight: 100 parts of dead-burned magnesia, 30-30 parts of magnesium chloride 50 parts, 5-10 parts of ultra-fine light calcium carbonate, 10-20 parts of silicon micropowder, 4-8 parts of dispersant, 0-2 parts of borax, 0.1-0.2 parts of citric acid, 0.05-0.2 parts of phosphoric acid, water loss reduction 0.3-2 parts of agent, 30-50 parts of water. The initial setting time of the acid-soluble plugging agent provided by the invention is controllable in the range of 120min-660min, which meets the pumping requirements of the fracturing construction process, and the 24h compressive strength is greater than 30MPa , the plugging effect is good, and can be completely dissolved by acid, meeting the requirements of Changqing Oilfield 3 1 / 2 "Requirements for segmental fracturing of tubing (inner diameter 76mm) cementing and completion sidetracking slim hole.

Description

technical field [0001] The invention belongs to the technical field of oil field fracturing, and specifically relates to a method for realizing 3 1 / 2 "Acid-soluble plugging agent for staged fracturing of sidetracked slim hole for tubing (inner diameter 76mm) cementing and completion and its preparation method. Background technique [0002] Changqing Oilfield has now entered a stable production period. With the extension of development time, Jurassic low-permeability reservoirs, Ansai, Jingan and other Triassic ultra-low-permeability reservoirs have entered the middle and late stages of development. In order to effectively produce the remaining oil in the formation, fully Excavate reservoir potential, enhance oil recovery, and introduce sidetracking technology. The sidetracking technology of sidetracking a new wellbore in the old well section has the advantages of low cost, quick effect and significant economic effect. However, due to the small sidetracking hole, it is li...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/514C09K8/508
CPCC09K8/5083C09K8/514
Inventor 杨立安李建山齐银卜向前吕宝强常笃何衡康博李建辉黄婷
Owner PETROCHINA CO LTD
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