Horizontal well cement paste

A well water and mud technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of not being able to maintain the integrity of the cement sheath, not being able to disperse the cement particles uniformly, and poor stability of the cement slurry system. Elastoplasticity, small brittleness coefficient, and high flexural strength

Active Publication Date: 2015-05-27
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the action of gravity, during drilling in the horizontal section, cuttings will be deposited on the lower side of the wellbore and accumulate into a thicker pseudo-mud cake to form a cuttings bed. It will provide passages for oil, gas and water channeling, leaving great hidden dangers for the layered exploitation of horizontal wells, which will seriously lead to the scrapping of horizontal well projects
[0007] At present, the commonly used conventional cement has poor toughness, cannot undergo elastic plastic deformation, cannot b

Method used

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  • Horizontal well cement paste
  • Horizontal well cement paste
  • Horizontal well cement paste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A horizontal well cement slurry shown includes the following components: cement + toughening agent GZR + GFC expansion agent + GH retarder, the weight percentage of each component is, toughening agent GZR0.5%-2.5 %, GFC expansion agent 1%-3%, GH retarder 0.04%-0.08%, and the rest is cement. It also includes GSJ fluid loss reducer and USZ dispersant, the GSJ fluid loss reducer accounts for 0.2%-0.4% by weight, and the USZ dispersant accounts for 0.04%-0.08% by weight. Using this formula, make the following performance evaluation of this cement slurry

[0035] 1. Toughness evaluation:

[0036] Table 1 Routine performance evaluation of ductile anti-channeling cement slurry system:

[0037]

[0038] 2. Evaluation of expansion performance

[0039] Table 2. Expansion test at different temperatures with different additions of GFC expansion agent

[0040]

[0041] It can be seen from Table 2 that the lattice expansion material GFC shows a certain expansion effect at d...

Embodiment 2

[0043] On the basis of embodiment 1, described GZR toughening agent is made up of elastic particle material, anti-fracture material and anti-seepage material, and described elastic particle material, anti-fracture material and anti-seepage material are according to 20:1.5: It is formed by mixing in a ratio of 1.5. The elastic granular material is thermoplastic elastomer TPR granular material from Dongguan Jiejia Plastic Technology Co., Ltd., the anti-fracture material is waste rubber particles, and the anti-seepage material is polyethylene;

[0044] The following is the performance evaluation of a toughening material, the Young's modulus Poisson's ratio of cement stone under different additions

[0045] Determine the toughening material GZR-1 as the main material of the tough cement slurry, change its addition amount in the cement, and the measured cement stone properties are shown in the following table:

[0046] Table 3 Performance test of cement stone under different dosage...

Embodiment 3

[0076] The expansion agent is composed of 1.2% sodium chloride, 1.5% sodium thiosulfate, 0.3% pull-off powder BX, 0.4% water reducing agent JN0.4%, 0.8% ammonium chloride, and 0.005% aluminum powder according to the weight percentage of the following ingredients: %, iron powder 95%, sodium chloride is industrial salt; sodium thiosulfate; used as an alkaline additive in this agent, pull open powder BX hair dye, used as a dispersant in this agent; water reducer JN also known as Sodium methylnaphthalene sulfonate formaldehyde condensate, brown powder; easily soluble in water, stable chemical properties, non-flammable, non-toxic. Used as a cement additive, it has a strong dispersing effect on cement particles, expands the contact area between cement and water, promotes hydration reaction, reduces water consumption, and improves the strength, compactness and impermeability of concrete. Choose industrial products. Ammonium Chloride Dairy Equipment Cleaner. This agent is used as a ...

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Abstract

The invention provides a horizontal well cement paste, which comprises the following components in percentage by weight: 0.5%-2.5% of a flexibilizer GZR, 1%-3% of a GFC expansion agent, 0.04%-0.08% of a GH retarder and the balance of cement, zero free water and low-loss water, wherein the formed set cement does not shrink, and has a certain expansion rate and good mechanical property, and shows excellent tenacity. The set cement is high in breaking strength, and small in crumbly coefficient; the tenacity coefficient is increased; the young modulus of the set cement is decreased; the poisson ratio is increased; the bending radius of the set cement is reduced; a triaxial stress strain curve shows good elastoplasticity; the anti-channeling ability is improved; the thickening time is shortened; the time and the fluid channeling rate of a formation fluid intruding into the cement paste are reduced; the paste is uniform, stable and good in mobility; reduction of annular flow resistance is facilitated; and the displacement efficiency is improved.

Description

technical field [0001] The invention belongs to the field of horizontal well cementing, and in particular designs a horizontal well cement slurry. Background technique [0002] Oil-horizontal wells usually refer to directional wells with an inclination angle of more than 86°. The well trajectory not only travels a certain length in the oil and gas layers, but also increases the contact area with the oil and gas reservoirs, changing the oil drainage area. , It reduces the flow rate and pressure of oil and gas, which is an effective measure and main means to increase and stabilize production in the development of low permeability oil and gas fields. [0003] Since the 1990s, the world's horizontal well drilling technology has been rapidly promoted and popularized, and it has become an important way to improve the comprehensive benefits of oilfield exploration and development. In 1990, 1,290 horizontal wells were drilled abroad, which was 5.2 times that of 1989; At present, t...

Claims

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Application Information

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IPC IPC(8): C09K8/467
CPCC09K8/467
Inventor 王大权冯文革蒋敏窦虎清
Owner BC P INC CHINA NAT PETROLEUM CORP
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