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Magnesia cement slurry for water plugging, leak plugging, and temporary plugging of oil and gas well reservoirs and its preparation method

A technology of oil and gas wells and cement slurry, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems such as leakage, and achieve the effects of reducing leakage and low sensitivity

Active Publication Date: 2011-12-14
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a magnesia cement slurry system for oil and gas well reservoir water plugging, leak plugging, and temporary plugging. For the problems of leakage intervals such as medium reservoir holes or high permeability areas, the problem of water discharge in reservoir intervals, and the simultaneous plugging of oil and water layers, acidification can be used to remove plugging in the later stage, and the formed cement stone can be permanently left in the ground or removed from the formation by acidification , to achieve the purpose of no or less damage to oil and gas field reservoirs, and provide guarantee for accurate evaluation of oil and gas layers and oil and gas field development and production increase

Method used

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  • Magnesia cement slurry for water plugging, leak plugging, and temporary plugging of oil and gas well reservoirs and its preparation method
  • Magnesia cement slurry for water plugging, leak plugging, and temporary plugging of oil and gas well reservoirs and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Weigh 100 parts by weight of active magnesium oxide, 1 part by weight of hydroxyethyl cellulose, 0.5 parts by weight of sodium octaborate, 6 parts by weight of sucrose, and 30 parts by weight of calcium carbonate dry-mixed into dry powder, measure 84 parts by weight of water, weigh 34 parts by weight Parts by weight of anhydrous magnesium chloride are dissolved in water. Then, put the aqueous solution in the mixing container, the stirrer rotates at a low speed (4000±200 rpm), and add the mixed dry powder within 15 seconds, cover the lid of the stirrer, and turn it at a high speed (12000±200 rpm). 500 rpm) and continue to stir for 35 seconds, the oil and gas well reservoir water plugging, plugging, temporary plugging and plugging magnesia cement slurry is ready.

Embodiment 2

[0032] Take 100 parts by weight of active magnesium oxide, 1 part by weight of carboxymethyl hydroxyethyl cellulose, 0.5 parts by weight of sodium tetraborate, 4 parts by weight of sucrose, and 10 parts by weight of calcium carbonate dry-mixed as dry powder, measure 84 parts by weight of water, Weigh 14 parts by weight of anhydrous magnesium chloride and 16 parts by weight of magnesium sulfate heptahydrate and dissolve them in water. Then, put the aqueous solution in the mixing container, the stirrer rotates at a low speed (4000±200 rpm), and add the mixed dry powder within 15 seconds, cover the lid of the stirrer, and turn it at a high speed (12000±200 rpm). 500 rpm) and continue to stir for 35 seconds, the oil and gas well reservoir water plugging, plugging, temporary plugging and plugging magnesia cement slurry is ready.

Embodiment 3

[0034]Weigh 100 parts by weight of active magnesium oxide, 1.5 parts by weight of hydroxyethyl cellulose, 1 part by weight of sodium tetraborate, 8 parts by weight of sodium pentaborate, 2 parts by weight of sucrose, and dry mix 190 parts by weight of calcium carbonate as dry powder, measure 84 Parts by weight of water, 3 parts by weight of ethoxylated sodium alkyl sulfate, 0.75 parts by weight of coconut oil aminopropyl betaine, 34 parts by weight of anhydrous magnesium chloride and 64 parts by weight of ammonium dihydrogen phosphate are dissolved in water. Then, put the aqueous solution in the mixing container, the stirrer rotates at a low speed (4000±200 rpm), and add the mixed dry powder within 15 seconds, cover the lid of the stirrer, and turn it at a high speed (12000±200 rpm). 500 rpm) and continue to stir for 35 seconds, the oil and gas well reservoir water plugging, plugging, temporary plugging and plugging magnesia cement slurry is ready.

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Abstract

The invention relates to magnesium-oxygen cement slurry used for reservoir water plugging, leak plugging and temporary-closure plugging in an oil and gas well and a preparation method thereof. The cement slurry contains the following components in parts by weight: 100 parts of active magnesium oxide, 50-105 parts of water, 30-100 parts of water-soluble blending agent, 0.5-10 parts of water-soluble borate, 1-8 parts of carbohydrate retarding agent, 0-400 parts of acid-soluble hard filling material, 1-5 parts of fluid loss agent, 0-5 parts of foaming agent and 0-2.5 parts of foam stabilizing agent, wherein the active magnesium oxide is obtained through roasting magnesium carbonate or magnesium oxide at high temperature; the water-soluble blending agent is a mixture which is one or over two of sodium pentaborate, sodium tetraborate and disodium octaborate tetrahydrate; the carbohydrate retarding agent is a mixture which is one or over two of sucrose, lactose and glucose; and the acid-soluble hard filling material is calcium carbonate or magnesium carbonate. According to the invention, a magnesium-oxide cement stone is removed from a stratum layer by using an acidizing way; the damageto the stratum layer is low; and the wide practical value is achieved.

Description

technical field [0001] The invention relates to a magnesia cement slurry system and a preparation method thereof for water plugging, leak plugging, temporary sealing and plugging of reservoir sections during drilling and well completion, and acid-soluble plugging in later stages. Background technique [0002] During cementing operations in a large number of low-permeability oil and gas reservoirs in China, due to cement slurry polluting oil layers and tight cement stones sealing the reservoir rock surface, acidizing operations have limited dissolution of conventional cement stones, seriously affecting single well productivity. In addition, in the field of unconventional oil and gas resources, shale gas exploitation also faces this technical difficulty. Due to the characteristics and flow mechanisms of shale multi-layer shale reservoirs are very different, it is necessary to produce as large a volume of gas as possible through drilling and fracturing. Fracturing surfaces to a...

Claims

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Application Information

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IPC IPC(8): C09K8/46
Inventor 李早元程小伟郭小阳贺婵娟靳东旭
Owner SOUTHWEST PETROLEUM UNIV
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