Additive composition of drilling fluid and oil base drilling fluid applicable to shale gas horizontal wells

A composition and drilling fluid technology, applied in the field of petrochemical drilling, can solve the problems of poor temperature resistance, low density, low blocking and inhibition, and achieve the effects of high temperature resistance and high density

Active Publication Date: 2016-08-31
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to overcome the defects of low density, poor temperature resistance, low plugging and inhibition of existing water-based drilling fluids, and provide a kind of water-b

Method used

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  • Additive composition of drilling fluid and oil base drilling fluid applicable to shale gas horizontal wells
  • Additive composition of drilling fluid and oil base drilling fluid applicable to shale gas horizontal wells
  • Additive composition of drilling fluid and oil base drilling fluid applicable to shale gas horizontal wells

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preparation example Construction

[0064] According to the present invention, in the preparation method of the modified silica nanoparticles, although the embodiment of the step (1) can be one of the monoalcohol, the coupling agent, and the monomer of the structure shown in the formula (1), One or more and one or more of the monomers with the structure shown in formula (2) are added to the reaction system together with silica nanoparticles, or any step-by-step mixing and then mixing together, for this The present invention is not particularly limited. However, in order to obtain more ideal modified silica nanoparticles after the contact reaction and polymerization reaction, preferably, step (1) includes: The body and the monomer of the structure shown in formula (2) are mixed (for example, at 10-40°C (preferably 20-30°C), stirring at a speed of 200-500rpm (preferably 250-350rpm) for 10-40min (preferably 20 -30min)), and adjust the pH of the resulting mixture to 7-9, preferably 7-8, more preferably 7-7.5 (for e...

Embodiment approach

[0071] According to a preferred embodiment of the present invention, the biomimetic wall-fixing agent contains a structural unit shown in formula (I):

[0072]

[0073] In formula (I), R 1 for hydrogen, -CH 2 COOR 3 ’, or -CH 2 COOR 3 , R 2 for hydrogen, and R 1 and R 2 at least one of n is an integer greater than 1, n R 5 Each independently is H or a group derived from dopamine and n R 5 At least one of them is a group derived from dopamine, R 4 for H or C 1 -C 10 The alkyl group, R"' is H, -CH 2 COOR 3 ’ or -CH 2 COOR 3 , and R 1 and R"' are not H, R at the same time 3 ’ is hydrogen or an alkali metal, R 3 is a group derived from dopamine.

[0074] The weight average molecular weight of the biomimetic wall-fixing agent may be 20000g / mol-150000g / mol, preferably 50000g / mol-100000g / mol.

[0075] According to the present invention, preferably, in formula (I), R 4 for C 2 -C 10 Alkyl, more preferably C 2 -C 6 of alkyl. R 4 Specific examples in...

specific Embodiment approach

[0090] According to a specific embodiment of the present invention, the preparation method of the biomimetic shale inhibitor comprises: in the presence of an inorganic acid catalyst, carrying out condensation reaction of arginine and lysine, the amount of arginine and lysine The molar ratio of the amount of amino acid is 0.2-6:1, and the condensation reaction conditions make the weight average molecular weight of the obtained biomimetic shale inhibitor 800-4000g / mol.

[0091] According to the present invention, in the preparation method of the bionic shale inhibitor, the arginine can be L-type, D-type or a mixture of the two, and the lysine can be L-type, D-type or a mixture of both. Preferably L-arginine and L-lysine are used.

[0092] According to the present invention, in the preparation method of the biomimetic shale inhibitor, the amount of the arginine and lysine is not particularly limited, as long as the weight average molecular weight of the product of the condensati...

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Abstract

The invention relates to the field of petrochemical drilling and discloses an additive composition of drilling fluid. The additive composition contains a nano-blocking agent, a bionic wall-fixing agent and a bionic shale Inhibitor, wherein the nano-blocking agent is a modified silicon dioxide nano-particle, and a modified group of the nano-blocking agent comprises a copolymer chain; the bionic wall-fixing agent is carboxymethyl chitosan with a main chain grafted with groups derived from dopamine; and the bionic shale Inhibitor consists of an arginine structural unit and an lysine structural unit. The invention further provides oil base drilling fluid containing the composition and applicable to shale gas horizontal wells. The drill fluid containing the additive composition has relatively high resistance, blockage property and inhibitive capability and environmental friendliness, particularly has relatively high density and is particularly applicable to the exploitation of shale gas.

Description

technical field [0001] The invention relates to the field of petrochemical drilling, in particular to a drilling fluid additive composition and an oil-like drilling fluid suitable for shale gas horizontal wells. Background technique [0002] With the increasing energy consumption, the development and utilization of unconventional energy sources such as shale gas and shale oil have gradually attracted attention. The proven shale oil and gas reservoirs in my country have huge reserves and high exploration and development value. At present, the exploitation of shale gas mainly adopts the method of long-section horizontal well and multi-stage staged fracturing to increase the output of a single well and enhance the value of industrial exploitation. Due to the strong water sensitivity of shale formations and the development of fractures, complex situations such as collapse and diameter shrinkage are prone to occur during drilling. Therefore, the main technical problem faced by d...

Claims

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Application Information

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IPC IPC(8): C09K8/03C09K8/035C09K8/32C09K8/502
CPCC09K8/032C09K8/035C09K8/32C09K8/502C09K2208/10
Inventor 蒋官澄张县民贺银博高德利伍贤柱杨丽丽马光长屈刚赵利
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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