Unlock instant, AI-driven research and patent intelligence for your innovation.

A kind of anti-salt leak-proof drilling fluid for drilling shale

A drilling fluid and shale technology, applied in drilling compositions, chemical instruments and methods, etc., can solve problems such as wellbore instability, and achieve the effects of less environmental pollution, easy handling, and strong blocking ability

Active Publication Date: 2018-11-27
SOUTHWEST PETROLEUM UNIV
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is: in order to overcome the problem of wellbore instability when using water-based drilling fluid to drill into shale formations, suppress the hydration and collapse of shale formations, and effectively plug the micro-nano pores and fractures of shale formations. A kind of anti-salt leak-proof drilling fluid for drilling shale

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of anti-salt leak-proof drilling fluid for drilling shale
  • A kind of anti-salt leak-proof drilling fluid for drilling shale
  • A kind of anti-salt leak-proof drilling fluid for drilling shale

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0017] Example 1: A preparation method of a salt-resistant and leak-proof drilling fluid for drilling shale.

[0018] First measure 1000 grams of tap water, raise the water temperature to 80 °C, add 50 grams of bentonite for drilling fluid under low speed 500r / min electric stirring, stir for 10 minutes, add 2.5 grams of Na 2 CO 3 Stir for another 30 minutes, pre-hydration at room temperature and pressure for 24 hours; then add 5 grams of drilling fluid under high-speed 8000r / min electric stirring and stir for 5 minutes with macromolecular emulsion EMP, and add 1 gram of emulsifier EML- 1 Stir for 5 minutes, add 15 grams of drilling fluid with compound loss-stopping agent FD-1 and stir for 15 minutes, add 1 gram of drilling fluid with anti-calcium and anti-salt fluid loss reducer BDF-200L and stir for 10 minutes; then add 5 grams of drilling fluid with high-efficiency lubricant THN-1 was stirred for 10 minutes, 10 grams of drilling fluid with fluid loss control agent DD-QK was...

example 2

[0019] Example 2: The rolling recovery rate of the drilling fluid system of the present invention was measured by using the XGRL-2 type roller heating furnace.

[0020] Table 2 The experimental results of the rolling recovery rate of the salt-resistant and leak-proof drilling fluid system for drilling shale

[0021] Drilling fluid formula

Experimental conditions

Recycled mass (g)

Recovery rate(%)

Clear water + 50g red soil

105℃ / 16h

5.00

10.00

Drilling fluid system+50g red soil

105℃ / 16h

48.24

96.48

[0022] Note: 1) The red bed soil is Sichuan red bed soil cuttings, and the shale outcrop is the Chang 7 shale outcrop, both of which are 6-10 mesh, and the recovery rate is over 40 mesh recovery rate; 2) The results in the table are all 2 times The mean of the experimental data.

[0023] Table 3 The experimental results of linear expansion of the salt-resistant and leak-proof drilling fluid system for drilling shale

[002...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a salt-resistant and anti-loss drilling liquid for shale drilling for shale gas development. The salt-resistant and anti-loss drilling liquid is used for overcoming the instability of well wall, inhibiting the hydration collapsing of shale stratums, and plugging the loss of stratums. The salt-resistant and anti-loss drilling liquid adopts the technical scheme that the salt-resistant and anti-loss drilling liquid is prepared from the following components according to the content in mass (g): 900 to 1000g of running water, 2 to 5g of macromolecule emulsion EMP of drilling liquid, 0.5 to 1g of emulsifier EML, 10 to 15g of composite plugging agent FD of drilling liquid, 0.15 to 1g of calcium-resistant and salt-resistant fluid loss agent BDF of drilling liquid, 2 to 5g of high-efficiency lubricant THN of drilling liquid, 5 to 10g of fluid loss agent DD-QK of drilling liquid, 10 to 20g of shale inhibitor LWJ-1 of drilling liquid, and 8 to 10g of composite plugging agent CD-FH of drilling liquid; NaOH is added with water to prepare 40% alkaline liquid, and the pH (potential of hydrogen) value of system is adjusted to 8.5; after stirring for 30min, the barite is added to adjust the density of drilling liquid to 1.20g / cm3; the liquid is stirred for 1h, so as to prepare the drilling liquid. The salt-resistant and anti-loss drilling liquid has the advantages that the pollution to environments is little, the rheological property and lubricating property are good, the plugging inhibiting capability is strong, and the salt-resistant and anti-loss drilling liquid is used for the shale drilling.

Description

technical field [0001] The invention relates to a salt-resistant and leak-proof drilling fluid for drilling shale used for shale gas development, which is particularly suitable for drilling long horizontal well sections of shale with developed micro-fractures. Background technique [0002] At present, with the rise of unconventional energy shale gas in China, after a new round of resource assessment, shale gas has been confirmed to have a broad prospect for exploitation in my country. It is to solve the current shortage of domestic oil and gas resources and achieve oil and gas reserves and production , the top priority of ensuring national energy security, and at the same time some key scientific issues surrounding shale gas development have also been put on the agenda. In the past, shale formations were studied as non-reservoir formations, but as the exploration and development of shale gas has entered a substantial stage of industrial exploitation, shale formations are bein...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/24
CPCC09K8/24C09K2208/04C09K2208/08C09K2208/34
Inventor 白杨石晛王平全陈婷陶鹏敬玉娟余冰洋杨萍胡亚琴
Owner SOUTHWEST PETROLEUM UNIV