Confining liquid system beneficial for stability of barefoot well wall of high temperature and high pressure well

A high-temperature, high-pressure, open-hole well technology, applied in the direction of drilling compositions, chemical instruments and methods, can solve problems such as wellbore instability and wellbore mudcake thickness, and achieve good rheology and good adaptability Effect

Inactive Publication Date: 2015-11-18
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a sealing fluid system suitable for long-term electrical surveying operations, which is beneficial to the stability of the open-hole wall of high-temperature and high-pressure w

Method used

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Examples

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Effect test

Embodiment 1

[0019] Example 1 The sealing liquid system of the present invention is prepared from the following mass ratio components: the sealing liquid system is composed of the following mass ratio components: 100 parts of fresh water, 12 parts of sodium bentonite, 3 parts of potassium chloride, caustic soda 6 parts, 4 parts of low-viscosity polyanionic cellulose with a degree of substitution of 0.9, 6 parts of sulfomethyl phenolic resin, 15 parts of humic acid resin, 7 parts of diluent sulfomethylated tannin, 8 parts of potassium-containing sulfonated lignite, 35 parts of sulfonated asphalt, 3 parts of calcium oxide, 295 parts of barite weighting agent (barium sulfate). During preparation, the above components were stirred at high speed for 60 minutes at normal temperature and pressure, and the density of the above system was increased with barite to 2.0g / cm 3 .

Embodiment 2

[0020] Example 2 The blocking solution of the present invention was prepared from the following mass ratio components: 100 parts of fresh water, 20 parts of sodium bentonite, 2 parts of potassium chloride, 5 parts of caustic soda, and low-viscosity polyanionic cellulose 2 with a degree of substitution of 1 2 parts, 2 parts of sulfomethyl phenolic resin, 10 parts of humic acid resin, 6 parts of iron chromium humate diluent lignite derivative, 9 parts of sulfonated lignite, 30 parts of sulfonated pitch, 2 parts of calcium oxide, barite weighting agent (Barium sulfate) 300 parts. During preparation, the above components were stirred at a high speed at room temperature and pressure for 70 minutes, and the density of the above system was increased to 2.2g / cm with barite 3 .

Embodiment 3

[0021] Example 3 The blocking solution of the present invention was prepared from the following mass ratio components: 100 parts of fresh water, 10 parts of calcium-sodium bentonite, 4 parts of potassium chloride, 6 parts of caustic soda, and low-viscosity polyanionic cellulose with a substitution degree of 1.2 4 parts, 3 parts of sulfomethyl phenolic resin, 20 parts of humic acid resin, 7 parts of diluent potassium nitrohumate, 7 parts of sulfonated lignite, 32 parts of sulfonated pitch, 4 parts of calcium oxide, barite weighting agent ( Barium sulfate) 260 parts, during preparation, the above components were stirred at a high speed for 50 minutes at room temperature and pressure, and the density of the above system was increased to 1.9g / cm with barite 3 .

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PUM

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Abstract

The invention discloses a confining liquid system beneficial for the stability of a barefoot well wall of a high temperature and high pressure well. The confining liquid system is prepared from the following components in parts by weight: 100 parts of fresh water, 10-20 parts of sodium bentonite, 2-4 parts of potassium chloride, 5-7 parts of caustic soda, 2-4 parts of low-viscosity polyanionic cellulose, 2-6 parts of a high temperature-resistant filtrate reducer, 10-20 parts of organic resin, 6-8 parts of a diluent, 7-9 parts of sulfonated lignite, 30-40 parts of sulfonated gilsonite, 2-4 parts of calcium oxide and 1-300 parts of barite. The confining liquid system is relatively good in rheological property, low in filter loss property and well in wall stability, and the problem that an electrical logging tool encounters resistance due to the situation that visual and thick mud cakes easily form on the well wall as the open hole section is exposed to well mud for a long time in the electrical logging operation period during the process of high temperature and high pressure well drilling can be solved; the confining liquid is applicable to the high temperature and high pressure well with the temperature of 150-220 DEG C, the long-term stability can reach 3 days, and the confining liquid has no special demand for well depth and is good in adaptability.

Description

technical field [0001] The invention relates to a sealing fluid system, in particular to a high-temperature and high-pressure sealing fluid system, and belongs to the technical field of oil field drilling. Background technique [0002] Sealing fluid is a measure taken during the tripping of offshore exploration wells to reduce the damage to the wellbore in the case of open holes after tripping. Generally, high-viscosity, high-shear performance drilling fluid is used as the sealing fluid, and the density is slightly higher than that normally required. There is a certain density of sealing fluid in the drill string, which can make the drilling fluid pressure in the drill string greater than the annular pressure, and reduce the possibility of drilling fluid ejecting from the drill string during the drilling process. [0003] In offshore high-temperature and high-pressure exploration wells, in order to meet the requirements for data acquisition, multiple electrical survey opera...

Claims

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Application Information

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IPC IPC(8): C09K8/24C09K8/20
CPCC09K8/24C09K8/203C09K8/206
Inventor 谢玉洪董星亮李中李炎军吴江黄熠段泽辉童传新陈浩东王巍张万栋张超杨仲涵曾春珉黄亮
Owner CHINA NAT OFFSHORE OIL CORP
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