Drilling fluid for improving formation pressure bearing capacity and its preparation method and application

A technology of pressure-bearing capacity and drilling fluid, which is applied in the field of drilling fluid and its preparation to improve the pressure-bearing capacity of formations. It can solve problems such as low pressure-bearing capacity of formations, sticking drill sticks, and lost circulation, so as to improve the pressure-bearing capacity of formations. , Enhanced anti-stick performance and improved strength

Active Publication Date: 2022-04-08
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the existing problems in the prior art in the drilling process of weak formations or deep formations, such as block dropping, sticking and sticking, and lost circulation during drilling due to the low pressure bearing capacity of the formations, and provide a A drilling fluid providing high formation pressure bearing capacity and its preparation method and application. The drilling fluid has high formation pressure bearing capacity and has excellent plugging effect when used in weak formations or deep formations

Method used

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  • Drilling fluid for improving formation pressure bearing capacity and its preparation method and application
  • Drilling fluid for improving formation pressure bearing capacity and its preparation method and application

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preparation example Construction

[0040] The second aspect of the present invention provides a method for preparing the drilling fluid for improving formation pressure bearing capacity according to the present invention, wherein the preparation method includes the following steps:

[0041] (1) Carry out prehydration treatment to bentonite, obtain prehydration bentonite slurry;

[0042] (2) Add low-viscosity polyanionic cellulose, lignite resin, high temperature and salt-resistant fluid loss reducer, silanol inhibitor, inorganic micro-nano rigid particles and emulsified pitch to the pre-hydrated bentonite slurry obtained in step (1), Stir to obtain the drilling fluid.

[0043] According to the present invention, the conditions of the prehydration treatment include: under the first stirring condition, adding 3-5 parts by weight of bentonite to 100 parts by weight of water to obtain a mixture; under the second stirring condition, adding The soda ash is mixed and allowed to stand to obtain a prehydrated bentonite s...

Embodiment 1

[0064] Measure 100 parts by weight of water, under electric stirring at a low speed of 1000r / min, add 4 parts by weight of bentonite, stir for 3 hours and add 0.10 parts by weight of Na 2 CO 3 , stirred for another 3 hours, and stood at room temperature for 24 hours for prehydration treatment; under high-speed 5000r / min electric stirring, add 0.5 parts by weight of low-viscosity anionic cellulose PAC-LV, stir for 15 minutes, add 5 parts by weight of the filter Add 0.2 parts by weight of lignite resin SPNH and stir for 10 minutes, add 0.8 parts by weight of anti-high temperature and anti-salt fluid loss reducer BDF-100S, 0.5 parts by weight of silanol inhibitor and high-efficiency silanol viscosity reducer, Stir for 15 minutes, add 1 weight part of inorganic micro-nano rigid particles I, 1 weight part of inorganic micro-nano rigid particles II and stir for 15 minutes, add 2 weight parts of emulsified pitch EP-2 and stir for 15 minutes, add 400 weight parts of weighting agent ba...

Embodiment 2

[0067] The drilling fluid is prepared according to the same method as in Example 1, except that 1 part by weight of inorganic micro-nano rigid particles I used in Example 1 is replaced by 1.5 parts by weight of inorganic micro-nano rigid particles I; 1 weight part of inorganic micro-nano rigid particle II was replaced by 1.5 weight part of inorganic micro-nano rigid particle II to prepare drilling fluid.

[0068] The results of high temperature and high pressure (HTHP) fluid loss test and mud cake performance test of the drilling fluid are shown in Table 1.

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Abstract

The invention relates to the field of drilling mud in the petroleum industry, and discloses a drilling fluid for improving the pressure bearing capacity of formations, a preparation method and application thereof. The drilling fluid comprises water, bentonite, low-viscosity polyanionic cellulose, lignite resin, anti-high temperature and anti-salt fluid loss reducer, silanol inhibitor, inorganic micro-nano rigid particles and emulsified asphalt; based on 100 parts by weight of water , the bentonite is 2-9 parts by weight, the low-viscosity polyanionic cellulose is 0.1-1 parts by weight, the lignite resin is 1-5 parts by weight, and the high-temperature and salt-resistant fluid loss reducer is 0.1-1 parts by weight. 2 parts by weight, the silanol inhibitor is 0.1-2 parts by weight, the inorganic micro-nano rigid particle is 0.5-5 parts by weight, and the emulsified asphalt is 1-10 parts by weight. The drilling fluid has high formation pressure bearing capacity, and has excellent plugging effect when used in weak formations or deep formations.

Description

technical field [0001] The invention relates to the field of drilling mud in the petroleum industry, in particular to a drilling fluid for improving the pressure bearing capacity of formations, a preparation method and application thereof. Background technique [0002] In the process of drilling deep formations, under the action of continuous high temperature, conventional drilling fluid thickens seriously, and the contradiction between rheology and fluid loss wall building is prominent, and it is easy to be polluted by salt, gypsum and calcium intrusion, which leads to the deterioration of drilling fluid performance , Maintenance processing is complex, and even lead to a series of downhole complex situations. Under normal circumstances, there are a large number of fractures in the collapsed formation. When drilling into the formation, the drilling fluid will quickly enter the formation along these fractures. At the same time, the mud shale will expand and disperse when it e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/16
CPCC09K8/16C09K2208/10C09K2208/18C09K8/206
Inventor 白杨张昊罗平亚李成程焱李国军
Owner SOUTHWEST PETROLEUM UNIV
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