Organic synthetic plugging granules for well drilling, and preparation method and application thereof

A technology of organic synthesis and particles, which is applied in drilling compositions, chemical instruments and methods, and earthwork drilling and mining, can solve the problems of poor dispersion of plugging particles, unsuitable density, and easy degradation, and achieve non-degradable, raw materials Saving and good effect of dispersion

Active Publication Date: 2015-04-22
CHENGDU DEDAO IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0019] The purpose of the present invention is to: propose a kind of organic synthetic plugging particle for drilling and its preparation method and application, solve the problem of traditional plugging particles with poor dispersion, unsuitable density, easy water absorption, easy degradation or strong brittleness, easy breakage, easy settlement, etc. Problem; improve the pressure resistance and temperature resistance of plugging and bridging particles

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The following components are proportioned by weight: 48 parts of polyetheretherketone (PEEK powder), 48 parts of polyetherimide (PEI pellets), 4 parts of calcium sulfate whiskers, and dyes. Add the aforementioned raw materials into a high-speed mixer, mix at a blending temperature of 380°C and a shear rate of 2.5 / s for 10 to 30 minutes, then extrude at 300°C, cool, dry, and granulate. Product particle size 0.180mm~4.750mm, density 1.35g / cm 3 , in a caustic soda solution with a pH value of 12.5 at 120°C, the mass loss rate is 13.51%, the plugging capacity is 16.5MPa, the filtration loss is 483ml, and the crushing rate under 25MPa pressure is 10.80%.

[0034] The test standards or methods for the aforementioned data are as follows:

[0035] Test method of crushing rate under pressure: Weigh 10g (accurate to 0.01g) of the sample (for example: particles with a specification of 1.000mm ~ 1.200mm, take the 1.200mm sieve but not the 1.000mm sieve) as m, add Into the pressure...

Embodiment 2

[0039]This example is basically the same as Example 1, the difference being that the following components are proportioned by weight: 33 parts of polyetheretherketone (PEEK powder), 33 parts of polyetherimide (PEI pellets), carbonic acid Calcium whiskers 4 parts, magnesium borate whiskers 30 parts, dye. Product particle size 0.180mm~4.750mm, density 2.0g / cm 3 , in a caustic soda solution with a pH value of 12.5 at 120°C, the mass loss rate is 9.85%, the plugging capacity is 18.5MPa, the filtration loss is 321ml, and the crushing rate under 25MPa pressure is 5.22%. The experimental detection method is as above.

Embodiment 3

[0041] This example is basically the same as Example 1, the difference being that the following components are proportioned by weight: 40 parts of polyether ether ketone (PEEK powder), 40 parts of polyetherimide (PEI pellets), carbonic acid Calcium whiskers 5 parts, magnesium borate whiskers 15 parts, dye. Product particle size 0.180mm~4.750mm, density 1.67g / cm 3 , in a caustic soda solution with a pH value of 12.5 at 120°C, the mass loss rate is 10.51%, the plugging capacity is 17MPa, the filtration loss is 383ml, and the crushing rate under 25MPa pressure is 7.32%. The experimental detection method is as above.

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Abstract

The invention discloses organic synthetic plugging granules for well drilling, and a preparation method and application thereof, belonging to the field of organic synthetic granular plugging agents in the technical field of well drilling. The plugging granules are prepared by blending one or more of calcium carbonate whisker, magnesium borate whisker and calcium sulfate whisker with polyetheretherketone and polyetherimide. The preparation method comprises the following steps: adding one or more of calcium carbonate whisker, magnesium borate whisker and calcium sulfate, polyetheretherketone and polyetherimide into a high-speed mixer, mixing at 380 DEG C at the shear velocity of 2.5/s for 10-30 minutes, extruding at 300 DEG C, cooling, and granulating. The organic synthetic plugging granules can be used as plugging granules and matched with plugging fibers and plugging flexible fragments for bridging plugging. The method solves the problems of poor dispersity, improper density, high water absorptivity, high degradation tendency, high brittleness, high breaking tendency, high sedimentation tendency and the like, and enhances the compression resistance and temperature resistance of the plugging bridging granules.

Description

technical field [0001] The invention belongs to the field of organic synthetic granular lost circulation agent in the technical field of drilling. Background technique [0002] The rapid development of China's economy has led to a sharp increase in energy consumption. The most important types of energy are oil and natural gas. Drilling engineering is the primary means of obtaining oil and gas resources. Lost circulation is a common complex situation in the drilling process, which can easily cause large losses. In drilling practice, although the causes and prevention of lost circulation have accumulated some successful experience. Sometimes although the method is effective, if the material is not selected properly, the right medicine cannot be prescribed, and the problem cannot be solved. [0003] Lost circulation is mainly caused by the drilling fluid column pressure being greater than the formation pore pressure or fracture pressure. The main reasons are as follows: 1....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/42E21B33/134
CPCC09K8/426C09K8/514C09K2208/18E21B33/138
Inventor 操盛章吴娇梅林德程鹏至周翰
Owner CHENGDU DEDAO IND
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