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Anti-pollution high efficiency isolation liquid and preparing method

A spacer fluid and anti-pollution technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of complex on-site preparation and construction procedures of spacer fluid, poor rheological adjustment and control ability, narrow range of spacer fluid density, etc. , to achieve the effect of improving displacement efficiency, strong anti-pollution ability and good chemical compatibility

Inactive Publication Date: 2006-11-08
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0022] The purpose of the present invention is to solve the problem of cementing quality caused by fluid interface contact pollution and poor interface cementation quality in the process of cementing displacement, as well as the existing isolation fluid with narrow density range, single performance and use, and poor rheological adjustment and control ability , Poor site adaptability, complex on-site preparation of spacer fluid and complex construction procedures

Method used

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  • Anti-pollution high efficiency isolation liquid and preparing method
  • Anti-pollution high efficiency isolation liquid and preparing method

Examples

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Effect test

Embodiment 1

[0038] Example 1. The basic performance of the isolating liquid chamber of the present invention is to prepare isolating liquid 1#, 2#, 3#, 4#. 1# and 2# are prepared by the base liquid method, and 3# and 4# are prepared by the dry mixing method.

[0039] 1#: Take 100 parts of clean water, first put in 8 parts of suspension stabilizer and stir for 2h, and then sequentially put in 0.65 parts of fluid loss agent, 0.6 part of thickener, and 0.5 part of diluent and stir evenly, the performance of the base fluid meets the requirements; put in 80 parts The density is 4.2g / cm 3 , 325 mesh barite is increased to the density design density, then add 0.15 part of PH value regulator, 0.1 part of viscosity-increasing and cutting agent, and a small amount of defoaming agent and stir evenly and serve.

[0040] 2#: Take 100 parts of clean water, put in 7.2 parts of suspension stabilizer and stir for 2 hours, then sequentially add in 0.6 parts of fluid loss agent, 0.6 parts of viscosity enhancer,...

Embodiment 2

[0045] Example 2. On the Mo154 gas well, the spacer fluid system was used in the small gap of the φ127mm tail pipe. The φ127mm tail pipe section adopts Φ149mm drill bit, the length of the open hole section is only 139m, and the cement slurry density is 2.40g / cm 3 -2.45g / cm 3 , The density of drilling fluid after drilling is 2.33g / cm 3 . The density of the on-site design isolation liquid is 2.33g / cm 3 , Using the base liquid method for on-site preparation, the specific formula is put into 100 parts of clear water, 5.2 parts of suspension stabilizer is stirred for 2h, and then 0.45 parts of fluid loss agent are added in sequence, the molecular weight of fluid loss agent is 10,000, and 0.44 parts of tackifier. 0.42 parts of diluent prepared base fluid to determine the performance of the base fluid to meet the requirements, the density after being placed for 10 hours is 5.0g / cm 3 The iron ore powder is heavier, and the density of the isolating liquid is increased to 2.33g / cm at one ti...

Embodiment 3

[0046] Example 3. In the Mo 160 well, the φ177.8mm oil layer casing uses the isolation fluid system. The casing of Mo 160 oil layer adopts φ215.9mm drill bit, the open hole sealing section is 3058m, the cement slurry is returned to the wellhead, and the drilling fluid density is 1.51g / cm. 3 . The base fluid method is used to prepare the isolation fluid on site. The formula is to add 11.5 parts of suspension stabilizer to 100 parts of sewage and stir for 2 hours, and then add 0.51 parts of fluid loss agent in turn, the molecular weight of fluid loss agent is 10,000, and 0.50 parts of viscosity increaser. , 0.45 part of diluent is stirred evenly, and the density of base liquid is 4.2g / cm after the test meets the requirements 3 The barite is increased to the density of the spacer solution 1.71g / cm 3 . The sewage used is deposited from waste drilling fluid on site. The prepared separator fluid has a funnel viscosity of 60s, an apparent viscosity of 38mPa·S, and a site consumption of 1...

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Abstract

The present invention relates to anti-pollution high efficiency isolating liquid for shaft wall cementing operation and its preparation process. The isolating liquid is compounded through adding suspension stabilizer, water reducing agent, tackifier, diluent, viscosity and shearing force increasing agent, weight additive and pH regulator in certain weight proportion into water. One compounding process is a water base process through throwing the said components successively into water in a slurry tank apparatus. One other compounding process is one dry mixture process in a cementing tank apparatus. The isolating liquid has flexible compounding process, high anti-pollution capacity and effective eliminating effect on well wall interface pollutant.

Description

Technical field [0001] The invention relates to an anti-pollution high-efficiency isolation fluid used in the technical field of oil drilling engineering cementing technology and a preparation method. Background technique [0002] For a well (especially a development well), ensuring the quality of cementing is of great significance for extending the life of oil and gas wells, acidizing in the later stage of production, fracturing stimulation, and improving the recovery rate of oil and gas wells. [0003] There are many measures to improve cementing quality. It is generally believed that wellbore preparation after well completion is one of the key factors affecting cementing displacement efficiency and interface cementation quality. Wellbore preparation includes: good drilling with original drilling tools before running casing; drilling fluid circulation and flushing for at least 2-3 weeks before cementing; performance adjustment during drilling fluid circulation and flushing (vis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/03
Inventor 杨香艳郭小阳李云杰
Owner SOUTHWEST PETROLEUM UNIV
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