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Water-based drilling fluid

A water-based drilling fluid and clean water technology, applied in the direction of drilling compositions, chemical instruments and methods, can solve problems such as hydrolysis and oxidation stability, low-temperature fluidity foaming, etc. stable, low environmental impact, and low unit cost

Inactive Publication Date: 2016-11-09
CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But there are also issues with hydrolytic and oxidative stability, low temperature fluidity, and foaming

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] As a preferred embodiment of the present invention, it discloses a water-based drilling fluid, which is prepared from clear water, inhibitors, fluid loss reducers, plugging agents, pH regulators, and weighting agents in parts by weight , clear water: inhibitor: fluid loss reducer: plugging agent: pH regulator: weighting agent=100:20~25:15~20:1~2:0.5~1:35~200.

[0024] The inhibitor is composed of 0.2 to 1 parts by weight of potassium polyacrylate KPAM, 0.5 to 2 parts by weight of polyanionic cellulose PAC-LV, and 0.3 to 2 parts by weight of inhibitor organosilicon aluminum QLA for high solid phase drilling fluid. , 10-20 parts by weight of potassium formate and 3-8 parts by weight of potassium chloride are mixed.

[0025] The fluid loss reducer is prepared by mixing 2-4 parts by weight of sulfonated phenolic resin SMP and 1-2 parts by weight of high temperature and salt resistant fluid loss reducer RSTF.

[0026] The plugging agent is shale inhibitor SOLTEX; the pH reg...

Embodiment approach

[0030] As a best embodiment of the present invention, its preparation method is as follows: take clear water, inhibitor, fluid loss control agent, plugging agent, stabilizer, pH regulator, weighting agent.

[0031] The specific ratio is: 400ml water, 1.2g KPAM, 3.2g PAC-LV, 2g QLA, 20g potassium chloride, 40g potassium formate, 40g SMP-1, 20g RSTF, 4g SOLTEX, 2g quicklime Weighted to 1.4g / cm 3 . After being fully stirred and mixed at 11000r / min, it was aged in a roller furnace at 100°C for 16 hours.

[0032] The measurement of basic performance parameters at 55°C is shown in Table 1:

[0033]

[0034] refer to figure 1 , The high-temperature and high-pressure filtration loss decreased significantly after 5 minutes and gradually decreased to zero after 40 minutes, achieving a good immediate plugging effect. Take out the formed filter cake, replace the drilling fluid with clean water and put it into the prepared high-performance drilling fluid high-temperature and high-pr...

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Abstract

The invention discloses water-based drilling fluid. The water-based drilling fluid is prepared from clear water, inhibitor, filtrate reducer, blocking agent, pH regulator and heavy loader according to the weight ratio of 100:(20-25):(15-20):(1-2):(0.5-1):(35-200). By the adoption of the water-based drilling fluid, environmental hazard of oil-based drilling fluid can be avoided, and efficient blocking, multi-phase lubrication, complex inhibition and weak gel property are realized. The water-based drilling fluid is suitable for drilling in a shale gas horizontal well of a long horizontal wellbore which has high hardness and fragility and is prone to collapse, and has high environment friendliness and economical efficiency.

Description

technical field [0001] The invention relates to the technical field of oil and gas drilling, in particular to a high-performance water-based drilling fluid suitable for shale gas horizontal wells. Background technique [0002] With the success of large-scale commercial development of shale gas in the United States, my country is also paying more and more attention to the exploitation and utilization of shale gas. From the Sinian to the Middle Triassic, my country has a wide range of developed marine deposits, with a distribution area of ​​more than 200 square kilometers and a cumulative maximum stratum thickness of more than 10Km. According to reliable exploration data, the shale gas in the Lower Cambrian Qiongzhusi Formation in the southern Sichuan Basin alone is 7.14-14.6×1012m 3 , which is 1-2 times of the existing conventional natural gas resources in the entire Sichuan Basin. Therefore, the development of shale gas has both broad application prospects and high strateg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/12
CPCC09K8/12
Inventor 胡静马光长李茂森何涛李朝凯王君
Owner CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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