Testing operation pipe column capable of achieving straight pushing well killing and formation testing method thereof
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A technology for formation testing and operating pipe strings, which is applied in surveying, earthwork drilling, wellbore/well components, etc. It can solve the problems of long plugging operation time, poor mud passability, pipe string stuck, etc., and reduce economic losses , ensure safety and controllability, and ensure the effect of construction
Active Publication Date: 2017-03-22
BC P INC CHINA NAT PETROLEUM CORP +1
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However, the gap is very small and the mud passability is poor, resulting in long plugging operation time and low efficiency, and the plugging material is easy to bridge and settle here, resulting in downhole complexities such as pipe string stuck.
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Embodiment 1
[0020] A test operation string that can realize direct push well killing, which is composed of oil pipe 1, normally closed valve 2, one-way shut-in circulation valve 3, normally open valve 4, pressure gauge holder 5, It consists of safety joint 6, RTTS packer 7, tubing 8, screen 9 and perforating gun 10.
[0021] A formation testing method that can realize direct pushing well killing. The technological process is as follows: after the pipe string is lowered to a predetermined depth → setting → changing the wellhead → replacing acid fluid through a normally open valve → closing the normally open valve by throwing a ball, performing perforation, Acidizing and blowout test operations → pressurize the annular space to operate the one-way shut-in circulation valve, shut down the well → positively inject plugging mud into the pipe string, kill the well, plugging → circulation → unsealing → trip out to obtain downhole data.
[0022] After the pipe string is lowered to a predetermined...
Embodiment 2
[0031] This embodiment further illustrates the present invention in conjunction with the accompanying drawings.
[0032] Through the dual pressure control mode of annulus + tubing, tubing 1 + normally closed valve 2 + one-way shut-in circulation valve 3 + normally open valve 4 + pressure gauge holder 5 + safety joint 6 + RTTS is used for isolation from top to bottom 7+Tube 8+Screen 9+Perforating gun 10. The string has the functions of perforating, acidizing, testing, downhole shut-in and repressurization, direct push and kill plugging, and acquisition of downhole temperature and pressure data.
[0033] The main process flow is as follows:
[0034] Run the above-mentioned combined pipe string as required, and measure the depth by electrical measurement.
[0035] Complete the setting of packer 7, pour out the wellhead blowout preventer device, reinstall the gas production wellhead, connect the ground testing process, and test the pressure of each equipment and pipeline one by o...
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Abstract
The invention discloses a testing operation pipe column capable of achieving straight pushing well killing and a formation testing method thereof. The formation testing method comprises the technological processes that the pipe column is put downwards to the predetermined depth; seat sealing is conducted; well head replacing is conducted; acid liquor is replaced through a normally open valve; the normally open valve is closed by throwing balls, and perforating, acidifying and open flow testing operation are conducted; a one-way well shut-in type circulation valve is operated through annulus pressure, and downhole shut-in is conducted; leaking stoppage mud is positively injected into the pipe column, and well killing and leaking stoppage are conducted; circulating is conducted; deblocking is conducted, and downhole information is obtained after the pipe column is lifted out. According to the testing operation pipe column capable of achieving straight pushing well killing and the formation testing method thereof, the multiple functions such as perforating, acidifying, testing, downhole shut-in re-pressing, and straight pushing well killing leaking stoppage can be achieved; the structure is simple and feasible; great convenience is mainly provided for well killing leaking stoppage operation in the later period, and the safe and reliable effects are achieved; and thus, the requirements for well killing leaking stoppage construction operation of a reservoir prone to leakage are met, economic losses brought by the complexity caused by well killing leaking stoppage and the like are decreased, and the effect that construction is safe and controllable is ensured.
Description
technical field [0001] The invention relates to a formation testing method, in particular to a test operation pipe string capable of realizing direct pushing and well killing and a formation testing method thereof. Background technique [0002] At present, high-temperature and high-pressure deep well tests usually use APR test tools to carry out operations. Over the years, a complete set of relatively fixed process and string structure has been formed, namely OMNI valve + RDS valve + LPR-N valve + pressure gauge holder + hydraulic bypass + safety Joint + RTTS packer. After the well test operation is completed, the disposable shut-in valve (RDS valve) in the downhole tubing string is operated to close the ball valve and block the channel in the tubing by pressing the annular space. Open, the internal channel of the string is closed, and the upper and lower directions are not connected. Such a pipe string structure and supporting tools cannot meet the needs of subsequent wel...
Claims
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