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A cement slurry with high toughness, high elastoplasticity and high density for well cementing

A high-toughness, high-density technology, applied in the field of oil and gas well cementing, can solve the problems of affecting the anti-gas channeling effect, adding a large amount of anti-gas channeling agent, and breaking emulsion.

Active Publication Date: 2020-02-11
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, latex anti-gas channeling agents are added in a large amount, and when the storage temperature is low, demulsification will occur, which will affect the anti-gas channeling effect

Method used

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  • A cement slurry with high toughness, high elastoplasticity and high density for well cementing
  • A cement slurry with high toughness, high elastoplasticity and high density for well cementing
  • A cement slurry with high toughness, high elastoplasticity and high density for well cementing

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preparation example Construction

[0039] The preparation method of described modified rubber powder comprises the following steps:

[0040] (1) Cleaning of rubber powder: Put the rubber powder in a glass container and spread it evenly, put it in the cavity of the plasma processor, turn on the power, turn on the vacuum pump, and when the vacuum in the cavity reaches below 10Pa, open the flow valve and put To process the gas, when the flow rate reaches the set value, turn on the high-frequency power supply to discharge and clean; the mesh of the rubber powder is 100 mesh, the process gas is oxygen, and the cleaning power is 200W;

[0041] (2) Activation of rubber powder: put the cleaned rubber powder obtained in step (1) into a glass container and spread evenly, put it in the cavity of the plasma processing instrument, turn on the power, open the vacuum pump, and wait until the vacuum degree in the cavity reaches When the flow rate is below 10Pa, open the flow valve and put in the processing gas. When the flow r...

Embodiment 1

[0068] The cement slurry with high toughness, high elastoplasticity and high density, calculated in parts by weight, includes 100 parts of cement, 8 parts of modified rubber powder, 3 parts of elastoplastic agent, 90 parts of density regulator, 59 parts of water, 0.8 parts of dispersant, 5 parts of fluid loss reducer, 1.35 parts of retarder, 1 part of anti-air channeling agent, 0.2 part of defoamer, 10 parts of filler;

[0069] The elastoplastic agent is rubber powder, thermal insulation powder, asbestos powder, fiber, and the weight ratio of the rubber powder to the thermal insulation powder, the asbestos powder, and the fiber is 1:0.22:0.43:0.02; The agent is barite, calcium carbonate, barium carbonate, and galena powder; the weight ratio of barite to the calcium carbonate, the barium carbonate, and the galena powder in the weighting agent is 1: 1.2: 0.5: 0.8; the filler is styrene-acrylic latex; the dispersant is sodium lignosulfonate; the fluid loss reducer is 2-acrylamide...

Embodiment 2

[0079] The cement slurry with high toughness, high elastoplasticity and high density, calculated in parts by weight, includes 100 parts of cement, 2 parts of modified rubber powder, 9 parts of elastoplastic agent, 90 parts of density regulator, 59 parts of water, 0.8 parts of dispersant, 5 parts of water loss reducer, 1.35 parts of retarder, 1 part of anti-air channeling agent, 0.2 part of defoamer, 10 parts of filler; the elastoplastic agent is rubber powder, thermal insulation powder, asbestos powder , fiber, the weight ratio of the rubber powder to the heat preservation powder, the asbestos powder, and the fiber is 1: 0.22: 0.43: 0.02; the weighting agent is barite, calcium carbonate, barium carbonate, square lead Mineral powder; the weight ratio of the barite in the weighting agent to the calcium carbonate, the barium carbonate, and the galena powder is 1:1.2:0.5:0.8; the filler is styrene-acrylic latex The dispersant is sodium lignosulfonate; the dehydration reducer is 2-...

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Abstract

The invention provides high-tenacity, high-elastoplasticity and high-density cement paste for well cementation. The high-tenacity, high-elastoplasticity and high-density cement paste comprises, by weight, 100 parts of cement, 2-15 parts of modified rubber powder, 2-10 parts of elastoplastic, 80-95 parts of density regulators, 50-65 parts of water, 0.5-2 parts of dispersing agents, 2-10 parts of fluid loss agents, 1-3 parts of retarders, 0.5-2 parts of anti-fluid-channeling agents, 0.1-1 part of defoaming agent and 5-15 parts of filling agents. The density regulators are weighting agents comprising one or more of barite, iron ore powder, activated iron ore powder, manganese mineral powder, calcium carbonate, barium carbonate and galena powder. The filling agents comprise one or more of liquid silicon, styrene-acrylic latex and styrene-butadiene latex, wherein the average grain diameter of the solid phase is 1-100 nanometers.

Description

technical field [0001] The invention relates to the technical field of oil and gas well cementing, in particular, the invention relates to a cement slurry with high toughness, high elastic-plasticity and high density for well cementing. Background technique [0002] The oil well cement sheath bears the perforation impact of the high-energy jet downhole and the collision impact of the casing and the drill bit on the cement sheath when running the casing and continuing to drill. Because the cement sheath is brittle, its overall integrity will be destroyed. This leads to the failure of the interlayer sealing performance in the later stage, which has potential safety hazards for the late stimulation measures and development and production of oil and gas wells, especially high acid gas wells, and cannot guarantee the safe production of oil and gas wells, resulting in huge economic losses. In addition, due to the high pressure at the bottom of the well, oil and gas wells need to u...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/00C09K8/493
CPCC04B28/00C04B2111/00724C04B2201/20C04B2201/50C09K8/493C04B18/22C04B16/04C04B2103/0068C04B14/40C04B20/0048C04B14/368C04B14/36C04B14/28C04B14/26C04B24/32C04B24/283C04B24/305C04B24/18C04B22/16C04B24/383C04B24/003C04B24/16C04B24/06C04B24/24C04B24/04C04B24/008C04B24/42C04B24/2676
Inventor 魏继军李连江尹学源张洪印解德庆王国涛陈英明孙宝玉马志贺刘奇刘阳吕海丹赵亮张莉李进
Owner BC P INC CHINA NAT PETROLEUM CORP
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