Oil base drilling fluid wetting agent and application thereof

An oil-based drilling fluid and wetting agent technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve problems such as unsatisfactory wetting effect, drilling fluid sticking to drill pipe, insufficient temperature resistance, etc., to achieve Good economic and social benefits, little impact on rheology, and easy implementation

Inactive Publication Date: 2014-07-09
CNPC SICHUAN GASOLINEEUM GEOPHYSICAL PROSPECTING ENG TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] It should be noted that the wetting effect of foreign wetting agent products is good, especially in high-density oil-based drilling fluids, which have little impact on the rheology of the system and will not cause thickening of high-density drilling fluids, but the price is high and the source limited
Domestic products have unsatisfactory wetting effects under high-density conditions, and heavy materials precipitate due to poor wetting, resulting in difficulty in stabilizing the density and often greatly increasing the viscosity of the system, resulting in too thick drilling fluid, seriously affecting the rheology of the system, and affecting subsequent drilling operations. It brings a series of problems, such as poor tripping, drilling fluid sticking to drill pipe, etc., and domestic products have insufficient temperature resistance

Method used

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  • Oil base drilling fluid wetting agent and application thereof
  • Oil base drilling fluid wetting agent and application thereof
  • Oil base drilling fluid wetting agent and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Wetting performance test of wetting agents. In order to screen out a reasonable proportion of wetting agent components, this example prepared a variety of wetting agents and numbered them respectively; meanwhile, in order to simplify the test, vegetable oleic acid from soybean was used as an example for illustration. The method for evaluating the wetting performance of the wetting agent in this example refers to the content recorded in the description of Chinese patents: Publication No. CN102053045A, Application No. CN201010521882.8; Publication No. CN 102816556A, Application No. 201210335309.7.

[0028] Wetting agent preparation:

[0029] 1# wetting agent: the preparation of vegetable pine tar and vegetable oleic acid is 90-10 (weight percent), stirring and mixing for 30 minutes.

[0030] 2# Wetting agent: the preparation of vegetable pine tar and vegetable oleic acid is 85-15 (weight percent), stirring and mixing for 30 minutes.

[0031] 3# Wetting agent: the prepar...

Embodiment 2

[0049] In order to further illustrate the wetting performance of the oil-based drilling fluid wetting agent of the present invention, three commonly used wetting agents were selected to conduct a comparison test of wetting performance. The wetting agent used in this example is the 7# wetting agent prepared in Example 1, and the three comparative wetting agents are dodecyltrimethylammonium bromide, SPAN-80 and TWEEN-80. Test method with reference to embodiment 1. The wettability of lauryltrimethylammonium bromide, SPAN-80 and TWEEN-8 as wetting agent measured in this embodiment is respectively 68%, 75% and 73%, lower than 7# wetting The wetting rate (93%) of the wetting agent shows that the wetting performance of the 7# wetting agent prepared by the method of the present invention is better than three commonly used wetting agents, and can be used as a good substitute for commonly used wetting agents Oil-based drilling fluid.

Embodiment 3

[0051] In order to verify whether the optimal wetting agent formula (7# wetting agent) screened in Example 1 has a good wetting effect on various weighting materials, this example is based on Example 1 and Example 2 On the above, the wetting performance of 7# wetting agent was comprehensively evaluated. The weighting materials for the test (all particle sizes are 20 μm) are barite, iron ore powder, limestone powder, manganese tetroxide; the wetting agent for the test is 7# wetting agent, dodecyltrimethylammonium bromide, SPAN -80 and TWEEN-80. Test method with reference to embodiment 1. The measurement results of this embodiment are shown in Table 2.

[0052] Table 2 Wetting properties of several wetting agents on different weighted materials

[0053]

[0054] It can be seen from Table 2 that the wetting performance of 7# wetting agent on barite, iron ore powder, limestone powder and manganese tetroxide is better than that of commonly used wetting agents such as dodecylt...

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Abstract

The invention discloses an oil base drilling fluid wetting agent and application thereof, belonging to the technical field of oil and gas filed chemical engineering. The wetting agent comprises the following components by weight percent: 60%-90% of pine tar and 10%-40% of oleic acid, wherein the pine tar is vegetable pine tar, oleic acid is vegetable oleic acid, and the adding amount of the wetting agent accounts for 1%-3% of the weight of the oil base drilling fluid. The components of the wetting agent have wide source of feed and are cheap; the wetting agent is easy to prepare, has good wetting effect on multiple weighting materials, and can be widely used for the base oil of the oil base drilling fluid; the oil base drilling fluid prepared by using the wetting agent can meet the well drilling and construction requirements of unconventionality oil and gas reservoirs.

Description

technical field [0001] The invention belongs to the technical field of oil and gas fields and relates to an oil-based drilling fluid wetting agent and its application, in particular to a wetting agent prepared with vegetable pine tar and vegetable oleic acid and its application in oil-based drilling fluid. Background technique [0002] Drilling fluid, also known as drilling flushing fluid, is a circulating flushing medium used in the drilling process. Drilling fluid mainly completes the tasks of suspension, pressure control, formation stability, buoyancy, lubrication and cooling during the drilling process. Drilling fluid has the functions of cleaning the bottom of the well and carrying cuttings; cooling and lubricating the drill bit and drill string; balancing the side pressure of the well wall rock, sealing and stabilizing the well wall; balancing the formation pressure; reducing the sedimentation velocity of cuttings; cuttings; effectively transmit hydraulic power; bear ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/035C09K8/34
CPCC09K8/035C09K8/34
Inventor 王京光杨斌张小平赵海峰吴满祥王勇强曹辉吴超寄晓宁
Owner CNPC SICHUAN GASOLINEEUM GEOPHYSICAL PROSPECTING ENG TECH RES INST
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