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Oil-based drilling cutting surface layer well cementation cement paste and preparation method thereof

A technology for cementing cement slurry and oil-based cuttings, which is applied in chemical instruments and methods, drilling compositions, building structures, etc., and can solve the problem of lack of efficient and feasible disposal methods for oil-based cuttings and the oily residue of drilling cuttings The efficiency is not up to the standard and other problems, to achieve the effect of harmless treatment, resource utilization, and simple components

Inactive Publication Date: 2020-10-30
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

[0004] The purpose of the present invention is to provide a surface cementing method for oil-based drilling cuttings in view of the fact that the oil content of the drilling cuttings residue does not reach the standard and the oil-based drilling cuttings lacks an efficient and feasible disposal method after thermal analysis method for oil removal. Cement slurry and its preparation method

Method used

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  • Oil-based drilling cutting surface layer well cementation cement paste and preparation method thereof
  • Oil-based drilling cutting surface layer well cementation cement paste and preparation method thereof
  • Oil-based drilling cutting surface layer well cementation cement paste and preparation method thereof

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preparation example Construction

[0032] The invention also protects a method for preparing oil-based drilling cuttings surface cementing cement slurry, which includes the following steps:

[0033] S1, according to the weight ratio, weigh 50-90 parts of G grade oil well cement, 10-50 parts of oil-based mud drilling cuttings, 2-6 parts of strengthening agent, 0.5-1.0 parts of expansion agent, 0.1-0.5 parts of drag reducer, 0.3-0.7 parts of defoamer are mixed and stirred into dry powder;

[0034] S2, weigh 44 parts of water and pour it into a constant speed stirrer;

[0035] S3, turn on the constant speed agitator, stir at a speed of 4000r / min, and pour the mixed dry powder prepared in S1 into the agitator within 15s, cover the agitator cover and stir for 35s at a speed of 12000r / min, to obtain the Surface cementing cement slurry.

Embodiment 1

[0037] This embodiment provides an oil-based drill cuttings surface cementing cement slurry, the preparation method of which is as follows:

[0038] S1, according to the weight ratio, weigh 90 parts of G-grade oil well cement, 10 parts of oil-based mud cuttings, 2 parts of reinforcing agent, 0.5 part of expansion agent, 0.1 part of drag reducer, and 0.3 part of defoamer, mix and stir to form dry powder;

[0039] S2, weigh 44 parts of water and pour it into a constant speed stirrer;

[0040] S3, turn on the constant speed agitator, stir at a speed of 4000r / min, and pour the mixed dry powder prepared in S1 into the agitator within 15s, cover the agitator cover and stir for 35s at a speed of 12000r / min, to obtain the Surface cementing cement slurry.

[0041] After testing, the oil-based drilling cuttings surface cementing cement slurry prepared in this example has a density of 1.90 g / cm 3 .

Embodiment 2

[0043] This embodiment provides an oil-based drill cuttings surface cementing cement slurry, the preparation method of which is as follows:

[0044] S1, according to the weight ratio, weigh 80 parts of G-grade oil well cement, 20 parts of oil-based mud cuttings, 3 parts of reinforcing agent, 0.8 part of expansion agent, 0.2 part of drag reducer, and 0.4 part of defoamer, mix and stir to form dry powder;

[0045] S2, weigh 44 parts of water and pour it into a constant speed stirrer;

[0046] S3, turn on the constant speed agitator, stir at a speed of 4000r / min, and pour the mixed dry powder prepared in S1 into the agitator within 15s, cover the agitator cover and stir for 35s at a speed of 12000r / min, to obtain the Surface cementing cement slurry.

[0047] After testing, the density of the oil-based drilling cuttings surface cementing cement slurry prepared in this embodiment is 1.91g / cm 3 .

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Abstract

The invention belongs to the technical field of oil field well cementation, and relates to oil-based drilling cutting surface layer well cementation cement paste and a preparation method thereof. Thesurface layer well cementation cement paste comprises the following components in parts by weight: 50-90 parts of G-grade oil well cement, 10-50 parts of oil-based mud drilling cuttings, 2-6 parts ofa reinforcing agent, 0.5-1.0 part of an expanding agent, 0.1-0.5 part of a drag reducer, 0.3-0.7 part of a defoaming agent and 44 parts of water. The density of the surface layer well cementation cement paste is 1.90 g / cm < 3 >-1.94 g / cm < 3 >; the setting stability is less than or equal to 0.02 g / cm < 3 >, the volume shrinkage rate of the cement is less than 2%, the thickening time at 30-50 DEG Cis adjustable, the compressive strength of set cement is greater than 14.7 Mpa(30 DEG C. 24h), a surface casing can be effectively supported and protected, and the surface well cementation requirement is met. Solid waste oil-containing rock debris generated in the exploration and development process of shale gas is fully utilized, resource utilization of the oil-based drilling cuttings is achieved, the environment-friendly requirement is met, and the application prospect is good.

Description

technical field [0001] The invention belongs to the technical field of oil field cementing, and in particular relates to an oil-based drilling cuttings surface layer cementing cement slurry and a preparation method thereof. Background technique [0002] As an important part of conventional oil and gas resources, shale gas is composed of the most common clay minerals, which are easy to expand when exposed to water, strong water sensitivity, and prone to collapse. In order to ensure the stability of shale gas well walls To ensure wellbore safety, the shale intervals of all shale gas horizontal wells in the Changning-Weiyuan National Shale Gas Demonstration Area are drilled with high-density oil-based drilling fluid. However, with the gradual increase in the amount of oil-based mud, a large amount of oil-based drilling cuttings are produced. Oil-based drilling cuttings contain pollutants such as heavy metals, petroleum hydrocarbons, and organic matter. If they are directly disc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/02C09K8/467C09K103/00
CPCC04B28/02C04B2111/00724C04B2201/20C04B2201/50C09K8/467C09K2103/00C04B18/0463C04B22/148C04B22/149C04B22/064C04B22/06C04B24/22C04B24/42
Inventor 闵江本王文斌陈小荣张新发万向臣曲先伟李志宏权银虎王鼎王兴聂俊
Owner BC P INC CHINA NAT PETROLEUM CORP