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Double-effect washing type spacer fluid for well cementation and preparation method of spacer fluid

A spacer fluid and cementing technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problem that compatibility cannot meet the requirements of cementing quality, and achieve enhanced solubility and permeability, reduced The effect of cementing cost and reducing design dosage

Inactive Publication Date: 2019-02-22
成都欧美克石油科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After channeling occurs, part of the oil-based drilling fluid forms a closed space at the lower side, which cannot be effectively replaced, causing the oil-based drilling fluid to form a highly elastic gel-like structure under static or low shear rate conditions; in addition, the oil-based drilling fluid The emulsifier and wetting agent added in the drilling fluid often make the rock surface of the borehole wall become oil-wet, and it is difficult for the cement sheath to bond well with the second interface
[0004] Although some common spacers have a certain flushing effect on water-in-oil drilling fluids, they still have certain limitations, whether in terms of flushing efficiency, temperature resistance, or compatibility with water-in-oil drilling fluids. To meet the requirements of cementing quality, it is imperative to develop a new type of spacer fluid that not only has flushing effect, but also can well solve oil-based mud pollution.

Method used

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  • Double-effect washing type spacer fluid for well cementation and preparation method of spacer fluid
  • Double-effect washing type spacer fluid for well cementation and preparation method of spacer fluid
  • Double-effect washing type spacer fluid for well cementation and preparation method of spacer fluid

Examples

Experimental program
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preparation example Construction

[0031] The embodiment of the present invention provides a method for preparing a double-effect flushing spacer fluid for well cementing, including the preparation of flushing agent; the preparation of flushing agent includes: (1) according to the above weight parts, weigh water, AES and OP-10 , stir at 800-1200rpm for 20-30min until completely dissolved to obtain a mixed solution; (2) heat the mixed solution to 45-55°C, add cleaning aids according to the above weight parts, and continue stirring for 30-50min; (3) According to the above parts by weight, continue to add JFC and APG, stir at 800-1200rpm for 80-100min, and stir to obtain the above flushing agent.

[0032] The rinsing agent prepared by this method is used in the experiments of Example 1-Example 3 below.

Embodiment 1

[0035] This embodiment provides a double-effect flushing spacer fluid for well cementing, with a density of 1.80g / cm 3 : In parts by weight, the raw materials of the spacer fluid include: 100 parts of clear water, 20 parts of flushing agent, 1 part of suspending agent, 1 part of retarder, 155 parts of weighting agent and 0.1 part of defoamer. Wherein, in parts by weight, the raw materials of the flushing agent include: 80 parts of water, 20 parts of AES, 10 parts of OP-10, 10 parts of JFC, 10 parts of APG and 10 parts of butyl glycol ether.

[0036] A double-effect flushing spacer fluid for cementing. The preparation method is: add 1 part of suspending agent to 100 parts of clear water, stir well at low speed, then slowly add 1 part of retarder, and wait until the base fluid configuration is completed. Add 155 parts of weighting agent, stir evenly, add 20 parts of flushing agent and keep rotating at low speed. After the liquid is evenly distributed, finally add 0.1 part of def...

Embodiment 2

[0038] This embodiment provides a double-effect flushing spacer fluid for well cementing, with a density of 2.1g / cm 3 : In parts by weight, the raw materials of this spacer fluid include: 100 parts in clear water, 40 parts in flushing agents, 5 parts in suspending agents, 3 parts in retarders, 253 parts in weighting agents and 0.2 parts in defoamers; wherein, in parts by weight Counting, the raw materials of the flushing agent include: 80 parts of water, 30 parts of AES, 10 parts of OP-10, 10 parts of JFC, 20 parts of APG and 10 parts of ethylene glycol phenyl ether acetate.

[0039] A double-effect flushing type spacer fluid for cementing. The preparation method is: add 5 parts of suspending agent to 100 parts of clear water, stir well at low speed, then slowly add 3 parts of retarder, and wait until the base fluid is configured. Add 253 parts of weighting agent, stir evenly, add 40 parts of flushing agent and keep rotating at low speed. After the liquid is evenly distributed...

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Abstract

The invention belongs to the field of petroleum and gas well drilling and cementation technologies and oilfield chemical technologies and provides a double-effect washing type spacer fluid for well cementation and a preparation method of the spacer fluid. The spacer fluid is prepared from raw materials as follows: clear water, a washing agent, a suspending agent, a retarder, a weighting agent anda defoaming agent; the washing agent is prepared from raw materials as follows: water, sodium alcohol ether sulfate, octylphenol polyethylene-10, fatty alcohol polyethylene ether, alkyl glycoside anda cleaning aid. The double-effect washing type spacer fluid for well cementation has dual functions of washing and spacing, has efficient oil film cleaning capacity, can improve the interface cementing quality, realize high-quality cementing and sealing of annulus interfaces and guarantee stability of mud and has a function of avoiding contact pollution and thickening of oil-based mud and the spacer fluid. The preparation method of the double-effect washing type spacer fluid is scientific in design, simple to operate and suitable for industrial mass production.

Description

technical field [0001] The invention belongs to the technical field of petroleum and natural gas drilling and cementing technology and oilfield chemistry, and in particular relates to a double-effect flushing spacer fluid for well cementing and a preparation method thereof. Background technique [0002] With the continuous development of unconventional oil and gas resources represented by shale gas, oil-based drilling fluids are widely used in shale gas drilling technology. However, in the application process of oil-based drilling fluid, there are problems in oil-based drilling fluid cementing. [0003] Oil-based drilling fluid has high density and high viscosity and shear, so the possibility of channeling in highly deviated well sections is very high. After channeling occurs, a part of the oil-based drilling fluid forms a closed space at the low side, which cannot be effectively replaced, resulting in the formation of a highly elastic gel-like structure of the oil-based dr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/40C09K8/52C09K8/524
CPCC09K8/40C09K8/52C09K8/524C09K2208/12
Inventor 唐昌强高金李勇陈蔚
Owner 成都欧美克石油科技股份有限公司
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