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Water-based drilling fluid for loosening sandstones

A technology for water-based drilling fluid and sandstone, which is applied in the field of water-based drilling fluid, can solve the problems of difficult drilling fluids and the inability of conventional drilling fluids to meet the exploitation requirements of unconsolidated sandstone reservoirs, and achieves prevention of well wall collapse, good expansion, and strong inhibition. performance effect

Inactive Publication Date: 2016-03-09
LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are few studies on unconsolidated sandstone drilling fluids in my country, and conventional drilling fluids cannot meet the development requirements of unconsolidated sandstone reservoirs. Therefore, in the development of unconsolidated sandstone reservoirs, the selection of drilling fluids has become the primary problem

Method used

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  • Water-based drilling fluid for loosening sandstones
  • Water-based drilling fluid for loosening sandstones
  • Water-based drilling fluid for loosening sandstones

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The drilling fluid is prepared by water, sodium carbonate, bentonite, weighting agent, inhibitor, fluid loss reducer and viscosifier in parts by weight, and its specific mass fraction is: 84.3% water, 5% sodium carbonate, 4% bentonite, 0.2% PAC, 0.7% FLA1, 2% polyethylene glycol, 3% potassium silicate, 0.8% barium sulfate. The rheological properties, fluid loss control performance, inhibition performance and anti-pollution performance of unconsolidated sandstone drilling fluid are mainly evaluated.

[0015] 1 Evaluation of rheological properties of drilling fluid

[0016] (1) Rheological property test of drilling fluid before aging

[0017] The rheological properties of the unconsolidated sandstone drilling fluid system were measured according to the drilling fluid experiment standards and compared with conventional drilling fluids, as shown in Table 1.

[0018] (2) Rheological property test of drilling fluid after aging

[0019] According to the drilling fluid exper...

Embodiment 2

[0030] The drilling fluid is prepared from water, sodium carbonate, bentonite, weighting agent, inhibitor, fluid loss reducer and viscosifier in parts by weight, water: sodium carbonate: bentonite: weighting agent: inhibitor: filter reducer Lost agent: thickener = 80:3:2:0.5:3:0.5:0.1.

[0031] The weighting agent is barium sulfate; the fluid loss control agent is hydrolyzed polyacrylonitrile monoammonium salt NH4-HPAN; the tackifier is vinyl monomer multiple copolymer PAC143.

[0032] The inhibitor is a mixture of polyethylene glycol and potassium silicate, and the weight ratio of polyethylene glycol and potassium silicate is: polyethylene glycol:potassium silicate=2:3.

Embodiment 3

[0034] The drilling fluid is prepared from water, sodium carbonate, bentonite, weighting agent, inhibitor, fluid loss reducer and viscosifier in parts by weight, water: sodium carbonate: bentonite: weighting agent: inhibitor: filter reducer Lost agent: thickener = 90:8:6:1:8:0.9:0.3.

[0035] The weighting agent is barium sulfate; the fluid loss control agent is hydrolyzed polyacrylonitrile monoammonium salt NH4-HPAN; the tackifier is vinyl monomer multiple copolymer PAC143.

[0036] The inhibitor is a mixture of polyethylene glycol and potassium silicate, and the weight ratio of polyethylene glycol and potassium silicate is: polyethylene glycol:potassium silicate=2:3.

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Abstract

The invention relates to a water-based drilling fluid for loosening sandstones. The water-based drilling fluid is prepared from water, sodium carbonate, bentonite, a weighting agent, an inhibiting agent, a fluid loss additive and a tackifier in parts by weight, not only has relatively strong sand-carrying capacity and can clean boreholes relatively well, but also has relatively strong inhibition performance and can inhibit expansion and dispersion of the sandstones relatively well. The water-based drilling fluid effectively prevent well wall collapse caused by easy dispersibility of the sandstones, has relatively good fluid loss reducing property, and can effectively prevent drilling fluid filtrate from entering a stratum layer to pollute reservoir stratums.

Description

technical field [0001] The invention relates to a water-based drilling fluid, in particular to a loose sandstone water-based drilling fluid. Background technique [0002] In recent years, with the decrease of conventional oil and gas fields in my country, major oil companies have turned their attention to the development of unconventional oil and gas fields. Unconsolidated sandstone reservoirs are relatively common unconventional oil and gas reservoirs in my country. Their main characteristics are loose and easy to collapse, and the drilling requirements are extremely strict. At present, there are few studies on unconsolidated sandstone drilling fluids in my country, and conventional drilling fluids cannot meet the development requirements of unconsolidated sandstone reservoirs. Therefore, the selection of drilling fluids has become the primary problem in the development of unconsolidated sandstone reservoirs. It can be seen that it is very necessary to increase the researc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/24C09K8/52
CPCC09K8/24C09K8/52C09K2208/12
Inventor 杨双春李沼萱代秋实潘一岳庆友王家骏佟乐温航
Owner LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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