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Flushing fluid for oil-based drilling fluid cementing and preparation method thereof

An oil-based drilling fluid and flushing fluid technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the incompatibility of cement sheath, affect the quality of cementing, oilfield exploration and development, poor interface cementation performance, etc. problems, to achieve the effect of system stability, prevention of mixing and good compatibility

Active Publication Date: 2016-12-21
BC P INC CHINA NAT PETROLEUM CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Oil-based drilling fluid is the best system for drilling unstable formations, but when drilling with oil-based drilling fluid, a layer of oil slurry and oil film will adhere to the well wall and casing wall, which is obviously different from the cement sheath. Affinity, it will lead to poor bonding performance between the cement sheath and the first and second interfaces of cementing, and the interface bonding strength is almost zero, which will seriously affect the quality of cementing and the exploration and development of oilfields

Method used

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  • Flushing fluid for oil-based drilling fluid cementing and preparation method thereof
  • Flushing fluid for oil-based drilling fluid cementing and preparation method thereof
  • Flushing fluid for oil-based drilling fluid cementing and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Prepare by 100 parts by weight of fresh water, 5 parts by weight of cleaning agent, 3 parts by weight of cleaning aid, 1 part by weight of chelating agent, 1 part by weight of suspending agent and 20 parts by weight of weighting agent.

[0021] Weigh 70 parts by weight of fresh water, add 1 part by weight of suspending agent at 4000rpm and stir for 3 minutes, dissolve for 30 minutes; add 1 part by weight of chelating agent and 3 parts by weight of cleaning aid at 4000rpm and stir for 10 minutes; Add 20 parts by weight of solid phase particles within 20 seconds and stir for 1 minute; weigh 30 parts by weight of 40°C fresh water and dissolve 5 parts by weight of cleaning agent in the water, and finally mix the cleaning agent solution with the above formulation to prepare a rinse solution.

[0022] The measured flushing fluid density is 1.1g / cm 3 , in order to test the rheology and temperature resistance of the flushing agent system, pour the prepared flushing solution int...

Embodiment 2

[0029] Prepare by 100 parts by weight of fresh water, 10 parts by weight of cleaning agent, 6 parts by weight of cleaning aid, 2 parts by weight of chelating agent, 1 part by weight of suspending agent and 20 parts by weight of weighting agent.

[0030] Weigh 70 parts by weight of fresh water, add 1 part by weight of suspending agent at 4000rpm and stir for 3 minutes, dissolve for 30 minutes; add 2 parts by weight of chelating agent and 6 parts by weight of cleaning aid at 4000rpm and stir for 10 minutes; Add 20 parts by weight of solid particles within 20 seconds and stir for 1 minute; weigh 30 parts by weight of fresh water at 40°C and dissolve 5 to 15 parts by weight of cleaning agent in the water, and finally mix the cleaning agent solution with the above formulation evenly to prepare the Flush.

[0031] Pour the prepared oil-based drilling fluid into the slurry cup of the six-speed rotary viscometer, immerse the outer cylinder of the six-speed rotary viscometer in the oil...

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Abstract

The invention relates to a flushing liquid for oil-based drilling fluid well cementation and a preparation method thereof. The preparation method of the flushing liquid comprises: adding 1 part by weight of a suspending agent into 70 parts by weight of fresh water, stirring for 3 min with a speed of 4000 rpm, and dissolving for 30 min; adding 1-3 parts by weight of a chelating agent and 1-6 parts by weight of a cleaning auxiliary agent, and stirring for 10 min with a speed of 4000 rpm; with the stirring speed of 4000 rpm, adding 20 parts by weight of solid particles within 20 s, and stirring for 1 min; weighing 30 parts by weight of 40 DEG C fresh water, dissolving 5-15 parts by weight of a cleaning agent into the water; and finally uniformly mixing the cleaning agent solution with the above prepared solution, so as to prepare the flushing liquid. The flushing liquid has the characteristics of relatively strong permeation effect, oil flushing property and the like, used to flush oil slurry and oil films attached to well wall and casing pipe wall, helps to improve the affinity of a drilling fluid with a cement sheath and enhance the cementation property between the cement sheath and well cementation first and second interfaces, has the compatibility with conventional cement paste and oil-based drilling fluids, and is capable of improving and enhancing the rheological property of a drilling fluid system.

Description

technical field [0001] The invention relates to a flushing fluid for oil well cementing, which can be used to separate drilling fluid and cement slurry in well cementing and cementing operations, so as to prevent the drilling fluid and cement slurry from contacting and polluting each other. Background technique [0002] Flushing fluid is an important means to improve the quality of cementing. Due to the incompatibility of cement slurry and drilling fluid, it will produce flocculation substances with high shear force after mixing, which will seriously damage the cementing performance of the cement sheath, especially when using high-density drilling fluid. It is more prominent in the cementing of high-pressure oil and gas wells, complex wells and horizontal wells with oil-based drilling fluids. Oil-based drilling fluid is the best system for drilling unstable formations, but when drilling with oil-based drilling fluid, a layer of oil slurry and oil film will adhere to the well...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/52
CPCC09K8/52
Inventor 王翀谢飞燕刘爱萍孙富全邹建龙谭文礼席方柱
Owner BC P INC CHINA NAT PETROLEUM CORP
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